The opencensus API changes between 0.6.0 and 0.9.0 (#980)

We get some useful features in later versions; update so as to not
pin downstream consumers (extensions) to an older version.

Gopkg.lock

@@ -5,6 +5,7 @@
   name = "git.apache.org/thrift.git"
   packages = ["lib/go/thrift"]
   revision = "272470790ad6db791bd6f9db399b2cd2d5879f74"
+  source = "github.com/apache/thrift"
 
 [[projects]]
   branch = "master"
@@ -529,10 +530,11 @@
     "stats/view",
     "tag",
     "trace",
+    "trace/internal",
     "trace/propagation"
   ]
-  revision = "6e3f034057826b530038d93267906ec3c012183f"
-  version = "v0.6.0"
+  revision = "10cec2c05ea2cfb8b0d856711daedc49d8a45c56"
+  version = "v0.9.0"
 
 [[projects]]
   branch = "master"
@@ -664,6 +666,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "321ea984c523241adc23f36302d387cebbcc05a56812fc3555d82c9c5928274c"
+  inputs-digest = "5ff01d4a02d97ec5447f99d45f47e593bb94c4581f07baefad209f25d0b88785"
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -72,7 +72,7 @@ ignored = ["github.com/fnproject/fn/cli"]
 
 [[constraint]]
   name = "go.opencensus.io"
-  version = "0.6.0"
+  version = "0.9.0"
 
 [[override]]
   name = "git.apache.org/thrift.git"

api/agent/agent.go

@@ -19,7 +19,6 @@ import (
 	"github.com/sirupsen/logrus"
 	"go.opencensus.io/stats"
 	"go.opencensus.io/stats/view"
-	"go.opencensus.io/tag"
 	"go.opencensus.io/trace"
 )
 
@@ -1013,7 +1012,9 @@ func (c *container) FsSize() uint64                 { return c.fsSize }
 // WriteStat publishes each metric in the specified Stats structure as a histogram metric
 func (c *container) WriteStat(ctx context.Context, stat drivers.Stat) {
 	for key, value := range stat.Metrics {
-		stats.Record(ctx, stats.FindMeasure("docker_stats_"+key).(*stats.Int64Measure).M(int64(value)))
+		if m, ok := measures[key]; ok {
+			stats.Record(ctx, m.M(int64(value)))
+		}
 	}
 
 	c.statsMu.Lock()
@@ -1023,42 +1024,19 @@ func (c *container) WriteStat(ctx context.Context, stat drivers.Stat) {
 	c.statsMu.Unlock()
 }
 
+var measures map[string]*stats.Int64Measure
+
 func init() {
 	// TODO this is nasty figure out how to use opencensus to not have to declare these
 	keys := []string{"net_rx", "net_tx", "mem_limit", "mem_usage", "disk_read", "disk_write", "cpu_user", "cpu_total", "cpu_kernel"}
 
-	// TODO necessary?
-	appKey, err := tag.NewKey("fn_appname")
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	pathKey, err := tag.NewKey("fn_path")
-	if err != nil {
-		logrus.Fatal(err)
-	}
-
+	measures = make(map[string]*stats.Int64Measure)
 	for _, key := range keys {
 		units := "bytes"
 		if strings.Contains(key, "cpu") {
 			units = "cpu"
 		}
-		dockerStatsDist, err := stats.Int64("docker_stats_"+key, "docker container stats for "+key, units)
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			"docker_stats_"+key,
-			"docker container stats for "+key,
-			[]tag.Key{appKey, pathKey},
-			dockerStatsDist,
-			view.Distribution(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
+		measures[key] = makeMeasure("docker_stats_"+key, "docker container stats for "+key, units, view.Distribution())
 	}
 }
 

api/agent/drivers/docker/docker_client.go

@@ -102,101 +102,10 @@ type dockerWrap struct {
 }
 
 func init() {
-	// TODO doing this at each call site seems not the intention of the library since measurements
-	// need to be created and views registered. doing this up front seems painful but maybe there
-	// are benefits?
-
-	// TODO do we have to do this? the measurements will be tagged on the context, will they be propagated
-	// or we have to white list them in the view for them to show up? test...
-	var err error
-	appKey, err := tag.NewKey("fn_appname")
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	pathKey, err := tag.NewKey("fn_path")
-	if err != nil {
-		logrus.Fatal(err)
-	}
-
-	{
-		dockerRetriesMeasure, err = stats.Int64("docker_api_retries", "docker api retries", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			"docker_api_retries",
-			"number of times we've retried docker API upon failure",
-			[]tag.Key{appKey, pathKey},
-			dockerRetriesMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		dockerTimeoutMeasure, err = stats.Int64("docker_api_timeout", "docker api timeouts", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			"docker_api_timeout_count",
-			"number of times we've timed out calling docker API",
-			[]tag.Key{appKey, pathKey},
-			dockerTimeoutMeasure,
-			view.Count(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		dockerErrorMeasure, err = stats.Int64("docker_api_error", "docker api errors", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			"docker_api_error_count",
-			"number of unrecoverable errors from docker API",
-			[]tag.Key{appKey, pathKey},
-			dockerErrorMeasure,
-			view.Count(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		dockerOOMMeasure, err = stats.Int64("docker_oom", "docker oom", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			"docker_oom_count",
-			"number of docker container oom",
-			[]tag.Key{appKey, pathKey},
-			dockerOOMMeasure,
-			view.Count(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
+	dockerRetriesMeasure = makeMeasure("docker_api_retries", "docker api retries", "", view.Sum())
+	dockerTimeoutMeasure = makeMeasure("docker_api_timeout", "docker api timeouts", "", view.Count())
+	dockerErrorMeasure = makeMeasure("docker_api_error", "docker api errors", "", view.Count())
+	dockerOOMMeasure = makeMeasure("docker_oom", "docker oom", "", view.Count())
 }
 
 var (
@@ -447,3 +356,29 @@ func (d *dockerWrap) Stats(opts docker.StatsOptions) (err error) {
 	//})
 	//return err
 }
+
+func makeMeasure(name string, desc string, unit string, agg *view.Aggregation) *stats.Int64Measure {
+	appKey, err := tag.NewKey("fn_appname")
+	if err != nil {
+		logrus.Fatal(err)
+	}
+	pathKey, err := tag.NewKey("fn_path")
+	if err != nil {
+		logrus.Fatal(err)
+	}
+
+	measure := stats.Int64(name, desc, unit)
+	err = view.Register(
+		&view.View{
+			Name:        name,
+			Description: desc,
+			TagKeys:     []tag.Key{appKey, pathKey},
+			Measure:     measure,
+			Aggregation: agg,
+		},
+	)
+	if err != nil {
+		logrus.WithError(err).Fatal("cannot create view")
+	}
+	return measure
+}

api/agent/state_trackers.go

@@ -5,10 +5,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/sirupsen/logrus"
 	"go.opencensus.io/stats"
 	"go.opencensus.io/stats/view"
-	"go.opencensus.io/tag"
 )
 
 type RequestStateType int
@@ -140,76 +138,44 @@ func (c *containerState) UpdateState(ctx context.Context, newState ContainerStat
 	// update old state stats
 	gaugeKey := containerGaugeKeys[oldState]
 	if gaugeKey != "" {
-		stats.Record(ctx, stats.FindMeasure(gaugeKey).(*stats.Int64Measure).M(-1))
+		stats.Record(ctx, containerGaugeMeasures[oldState].M(-1))
 	}
 
 	timeKey := containerTimeKeys[oldState]
 	if timeKey != "" {
-		stats.Record(ctx, stats.FindMeasure(timeKey).(*stats.Int64Measure).M(int64(now.Sub(before).Round(time.Millisecond))))
+		stats.Record(ctx, containerTimeMeasures[oldState].M(int64(now.Sub(before).Round(time.Millisecond))))
 	}
 
 	// update new state stats
 	gaugeKey = containerGaugeKeys[newState]
 	if gaugeKey != "" {
-		stats.Record(ctx, stats.FindMeasure(gaugeKey).(*stats.Int64Measure).M(1))
+		stats.Record(ctx, containerGaugeMeasures[newState].M(1))
 	}
 }
 
+var (
+	containerGaugeMeasures []*stats.Int64Measure
+	containerTimeMeasures  []*stats.Int64Measure
+)
+
 func init() {
 	// TODO(reed): do we have to do this? the measurements will be tagged on the context, will they be propagated
 	// or we have to white list them in the view for them to show up? test...
-	appKey, err := tag.NewKey("fn_appname")
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	pathKey, err := tag.NewKey("fn_path")
-	if err != nil {
-		logrus.Fatal(err)
-	}
 
-	for _, key := range containerGaugeKeys {
+	containerGaugeMeasures = make([]*stats.Int64Measure, len(containerGaugeKeys))
+	for i, key := range containerGaugeKeys {
 		if key == "" { // leave nil intentionally, let it panic
 			continue
 		}
-		measure, err := stats.Int64(key, "containers in state "+key, "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			key,
-			"containers in state "+key,
-			[]tag.Key{appKey, pathKey},
-			measure,
-			view.Count(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
+		containerGaugeMeasures[i] = makeMeasure(key, "containers in state "+key, "", view.Count())
 	}
 
-	for _, key := range containerTimeKeys {
+	containerTimeMeasures = make([]*stats.Int64Measure, len(containerTimeKeys))
+
+	for i, key := range containerTimeKeys {
 		if key == "" {
 			continue
 		}
-		measure, err := stats.Int64(key, "time spent in container state "+key, "ms")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			key,
-			"time spent in container state "+key,
-			[]tag.Key{appKey, pathKey},
-			measure,
-			view.Distribution(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
+		containerTimeMeasures[i] = makeMeasure(key, "time spent in container state "+key, "ms", view.Distribution())
 	}
 }

api/agent/stats.go

@@ -79,13 +79,17 @@ var (
 )
 
 func init() {
-	// TODO(reed): doing this at each call site seems not the intention of the library since measurements
-	// need to be created and views registered. doing this up front seems painful but maybe there
-	// are benefits?
+	queuedMeasure = makeMeasure(queuedMetricName, "calls currently queued against agent", "", view.Sum())
+	callsMeasure = makeMeasure(callsMetricName, "calls created in agent", "", view.Sum())
+	runningMeasure = makeMeasure(runningMetricName, "calls currently running in agent", "", view.Sum())
+	completedMeasure = makeMeasure(completedMetricName, "calls completed in agent", "", view.Sum())
+	failedMeasure = makeMeasure(failedMetricName, "calls failed in agent", "", view.Sum())
+	timedoutMeasure = makeMeasure(timedoutMetricName, "calls timed out in agent", "", view.Sum())
+	errorsMeasure = makeMeasure(errorsMetricName, "calls errored in agent", "", view.Sum())
+	serverBusyMeasure = makeMeasure(serverBusyMetricName, "calls where server was too busy in agent", "", view.Sum())
+}
 
-	// TODO(reed): do we have to do this? the measurements will be tagged on the context, will they be propagated
-	// or we have to white list them in the view for them to show up? test...
-	var err error
+func makeMeasure(name string, desc string, unit string, agg *view.Aggregation) *stats.Int64Measure {
 	appKey, err := tag.NewKey("fn_appname")
 	if err != nil {
 		logrus.Fatal(err)
@@ -95,163 +99,18 @@ func init() {
 		logrus.Fatal(err)
 	}
 
-	{
-		queuedMeasure, err = stats.Int64(queuedMetricName, "calls currently queued against agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			queuedMetricName,
-			"calls currently queued to agent",
-			[]tag.Key{appKey, pathKey},
-			queuedMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		callsMeasure, err = stats.Int64(callsMetricName, "calls created in agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			callsMetricName,
-			"calls created in agent",
-			[]tag.Key{appKey, pathKey},
-			callsMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		runningMeasure, err = stats.Int64(runningMetricName, "calls currently running in agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			runningMetricName,
-			"calls currently running in agent",
-			[]tag.Key{appKey, pathKey},
-			runningMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		completedMeasure, err = stats.Int64(completedMetricName, "calls completed in agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			completedMetricName,
-			"calls completed in agent",
-			[]tag.Key{appKey, pathKey},
-			completedMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		failedMeasure, err = stats.Int64(failedMetricName, "calls failed in agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			failedMetricName,
-			"calls failed in agent",
-			[]tag.Key{appKey, pathKey},
-			failedMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		timedoutMeasure, err = stats.Int64(timedoutMetricName, "calls timed out in agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			timedoutMetricName,
-			"calls timed out in agent",
-			[]tag.Key{appKey, pathKey},
-			timedoutMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		errorsMeasure, err = stats.Int64(errorsMetricName, "calls errored in agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			errorsMetricName,
-			"calls errored in agent",
-			[]tag.Key{appKey, pathKey},
-			errorsMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
-	}
-
-	{
-		serverBusyMeasure, err = stats.Int64(serverBusyMetricName, "calls where server was too busy in agent", "")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			serverBusyMetricName,
-			"calls where server was too busy in agent",
-			[]tag.Key{appKey, pathKey},
-			serverBusyMeasure,
-			view.Sum(),
-		)
-		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
-		}
+	measure := stats.Int64(name, desc, unit)
+	err = view.Register(
+		&view.View{
+			Name:        name,
+			Description: desc,
+			TagKeys:     []tag.Key{appKey, pathKey},
+			Measure:     measure,
+			Aggregation: agg,
+		},
+	)
+	if err != nil {
+		logrus.WithError(err).Fatal("cannot create view")
 	}
+	return measure
 }

api/logs/s3/s3.go

@@ -429,42 +429,34 @@ func init() {
 	}
 
 	{
-		uploadSizeMeasure, err = stats.Int64("s3_log_upload_size", "uploaded log size", "byte")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			"s3_log_upload_size",
-			"uploaded log size",
-			[]tag.Key{appKey, pathKey},
-			uploadSizeMeasure,
-			view.Distribution(),
+		uploadSizeMeasure = stats.Int64("s3_log_upload_size", "uploaded log size", "byte")
+		err = view.Register(
+			&view.View{
+				Name:        "s3_log_upload_size",
+				Description: "uploaded log size",
+				TagKeys:     []tag.Key{appKey, pathKey},
+				Measure:     uploadSizeMeasure,
+				Aggregation: view.Distribution(),
+			},
 		)
 		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
+			logrus.WithError(err).Fatal("cannot create view")
 		}
 	}
 
 	{
-		downloadSizeMeasure, err = stats.Int64("s3_log_download_size", "downloaded log size", "byte")
-		if err != nil {
-			logrus.Fatal(err)
-		}
-		v, err := view.New(
-			"s3_log_download_size",
-			"downloaded log size",
-			[]tag.Key{appKey, pathKey},
-			downloadSizeMeasure,
-			view.Distribution(),
+		downloadSizeMeasure = stats.Int64("s3_log_download_size", "downloaded log size", "byte")
+		err = view.Register(
+			&view.View{
+				Name:        "s3_log_download_size",
+				Description: "downloaded log size",
+				TagKeys:     []tag.Key{appKey, pathKey},
+				Measure:     uploadSizeMeasure,
+				Aggregation: view.Distribution(),
+			},
 		)
 		if err != nil {
-			logrus.Fatalf("cannot create view: %v", err)
-		}
-		if err := v.Subscribe(); err != nil {
-			logrus.Fatal(err)
+			logrus.WithError(err).Fatal("cannot create view")
 		}
 	}
 }

api/server/server.go

@@ -576,7 +576,7 @@ func WithJaeger(jaegerURL string) ServerOption {
 		logrus.WithFields(logrus.Fields{"url": jaegerURL}).Info("exporting spans to jaeger")
 
 		// TODO don't do this. testing parity.
-		trace.SetDefaultSampler(trace.AlwaysSample())
+		trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 		return nil
 	}
 }
@@ -595,7 +595,7 @@ func WithZipkin(zipkinURL string) ServerOption {
 		logrus.WithFields(logrus.Fields{"url": zipkinURL}).Info("exporting spans to zipkin")
 
 		// TODO don't do this. testing parity.
-		trace.SetDefaultSampler(trace.AlwaysSample())
+		trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 		return nil
 	}
 }

vendor/go.opencensus.io/.gitignore

@@ -2,4 +2,3 @@
 
 # go.opencensus.io/exporter/aws
 /exporter/aws/
-

vendor/go.opencensus.io/.travis.yml

@@ -13,9 +13,14 @@ notifications:
 before_script:
   - GO_FILES=$(find . -iname '*.go' | grep -v /vendor/)  # All the .go files, excluding vendor/ if any
   - PKGS=$(go list ./... | grep -v /vendor/)             # All the import paths, excluding vendor/ if any
+  - curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh # Install latest dep release
+  - go get github.com/rakyll/embedmd
 
 script:
-  - if [ -n "$(gofmt -s -l .)" ]; then echo "gofmt the following files:"; gofmt -s -l .; exit 1; fi
+  - embedmd -d README.md              # Ensure embedded code is up-to-date
+  - dep ensure -v
+  - go build ./...                    # Ensure dependency updates don't break build
+  - if [ -n "$(gofmt -s -l $GO_FILES)" ]; then echo "gofmt the following files:"; gofmt -s -l $GO_FILES; exit 1; fi
   - go vet ./...
   - go test -v -race $PKGS            # Run all the tests with the race detector enabled
   - 'if [[ $TRAVIS_GO_VERSION = 1.8* ]]; then ! golint ./... | grep -vE "(_mock|_string|\.pb)\.go:"; fi'

vendor/go.opencensus.io/Gopkg.lock

@@ -0,0 +1,247 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  name = "cloud.google.com/go"
+  packages = [
+    "compute/metadata",
+    "internal/version",
+    "monitoring/apiv3",
+    "trace/apiv2"
+  ]
+  revision = "29f476ffa9c4cd4fd14336b6043090ac1ad76733"
+  version = "v0.21.0"
+
+[[projects]]
+  branch = "master"
+  name = "git.apache.org/thrift.git"
+  packages = ["lib/go/thrift"]
+  revision = "606f1ef31447526b908244933d5b716397a6bad8"
+  source = "github.com/apache/thrift"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/beorn7/perks"
+  packages = ["quantile"]
+  revision = "3a771d992973f24aa725d07868b467d1ddfceafb"
+
+[[projects]]
+  name = "github.com/golang/protobuf"
+  packages = [
+    "proto",
+    "protoc-gen-go/descriptor",
+    "ptypes",
+    "ptypes/any",
+    "ptypes/duration",
+    "ptypes/empty",
+    "ptypes/timestamp",
+    "ptypes/wrappers"
+  ]
+  revision = "925541529c1fa6821df4e44ce2723319eb2be768"
+  version = "v1.0.0"
+
+[[projects]]
+  name = "github.com/googleapis/gax-go"
+  packages = ["."]
+  revision = "317e0006254c44a0ac427cc52a0e083ff0b9622f"
+  version = "v2.0.0"
+
+[[projects]]
+  name = "github.com/matttproud/golang_protobuf_extensions"
+  packages = ["pbutil"]
+  revision = "3247c84500bff8d9fb6d579d800f20b3e091582c"
+  version = "v1.0.0"
+
+[[projects]]
+  name = "github.com/openzipkin/zipkin-go"
+  packages = [
+    ".",
+    "idgenerator",
+    "model",
+    "propagation",
+    "reporter",
+    "reporter/http"
+  ]
+  revision = "f197ec29e729f226d23370ea60f0e49b8f44ccf4"
+  version = "v0.1.0"
+
+[[projects]]
+  name = "github.com/prometheus/client_golang"
+  packages = [
+    "prometheus",
+    "prometheus/promhttp"
+  ]
+  revision = "c5b7fccd204277076155f10851dad72b76a49317"
+  version = "v0.8.0"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/prometheus/client_model"
+  packages = ["go"]
+  revision = "99fa1f4be8e564e8a6b613da7fa6f46c9edafc6c"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/prometheus/common"
+  packages = [
+    "expfmt",
+    "internal/bitbucket.org/ww/goautoneg",
+    "model"
+  ]
+  revision = "d0f7cd64bda49e08b22ae8a730aa57aa0db125d6"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/prometheus/procfs"
+  packages = [
+    ".",
+    "internal/util",
+    "nfs",
+    "xfs"
+  ]
+  revision = "8b1c2da0d56deffdbb9e48d4414b4e674bd8083e"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/net"
+  packages = [
+    "context",
+    "context/ctxhttp",
+    "http2",
+    "http2/hpack",
+    "idna",
+    "internal/timeseries",
+    "lex/httplex",
+    "trace"
+  ]
+  revision = "61147c48b25b599e5b561d2e9c4f3e1ef489ca41"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/oauth2"
+  packages = [
+    ".",
+    "google",
+    "internal",
+    "jws",
+    "jwt"
+  ]
+  revision = "921ae394b9430ed4fb549668d7b087601bd60a81"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/sync"
+  packages = ["semaphore"]
+  revision = "1d60e4601c6fd243af51cc01ddf169918a5407ca"
+
+[[projects]]
+  name = "golang.org/x/text"
+  packages = [
+    "collate",
+    "collate/build",
+    "internal/colltab",
+    "internal/gen",
+    "internal/tag",
+    "internal/triegen",
+    "internal/ucd",
+    "language",
+    "secure/bidirule",
+    "transform",
+    "unicode/bidi",
+    "unicode/cldr",
+    "unicode/norm",
+    "unicode/rangetable"
+  ]
+  revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
+  version = "v0.3.0"
+
+[[projects]]
+  branch = "master"
+  name = "google.golang.org/api"
+  packages = [
+    "googleapi/transport",
+    "internal",
+    "iterator",
+    "option",
+    "support/bundler",
+    "transport",
+    "transport/grpc",
+    "transport/http"
+  ]
+  revision = "fca24fcb41126b846105a93fb9e30f416bdd55ce"
+
+[[projects]]
+  name = "google.golang.org/appengine"
+  packages = [
+    ".",
+    "internal",
+    "internal/app_identity",
+    "internal/base",
+    "internal/datastore",
+    "internal/log",
+    "internal/modules",
+    "internal/remote_api",
+    "internal/socket",
+    "internal/urlfetch",
+    "socket",
+    "urlfetch"
+  ]
+  revision = "150dc57a1b433e64154302bdc40b6bb8aefa313a"
+  version = "v1.0.0"
+
+[[projects]]
+  branch = "master"
+  name = "google.golang.org/genproto"
+  packages = [
+    "googleapis/api/annotations",
+    "googleapis/api/distribution",
+    "googleapis/api/label",
+    "googleapis/api/metric",
+    "googleapis/api/monitoredres",
+    "googleapis/devtools/cloudtrace/v2",
+    "googleapis/monitoring/v3",
+    "googleapis/rpc/code",
+    "googleapis/rpc/status",
+    "protobuf/field_mask"
+  ]
+  revision = "51d0944304c3cbce4afe9e5247e21100037bff78"
+
+[[projects]]
+  name = "google.golang.org/grpc"
+  packages = [
+    ".",
+    "balancer",
+    "balancer/base",
+    "balancer/roundrobin",
+    "codes",
+    "connectivity",
+    "credentials",
+    "credentials/oauth",
+    "encoding",
+    "encoding/proto",
+    "grpclb/grpc_lb_v1/messages",
+    "grpclog",
+    "internal",
+    "keepalive",
+    "metadata",
+    "naming",
+    "peer",
+    "reflection",
+    "reflection/grpc_reflection_v1alpha",
+    "resolver",
+    "resolver/dns",
+    "resolver/passthrough",
+    "stats",
+    "status",
+    "tap",
+    "transport"
+  ]
+  revision = "d11072e7ca9811b1100b80ca0269ac831f06d024"
+  version = "v1.11.3"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "1be7e5255452682d433fe616bb0987e00cb73c1172fe797b9b7a6fd2c1f53d37"
+  solver-name = "gps-cdcl"
+  solver-version = 1

vendor/go.opencensus.io/Gopkg.toml

@@ -0,0 +1,44 @@
+[[constraint]]
+  name = "cloud.google.com/go"
+  version = "0.21.0"
+
+[[constraint]]
+  branch = "master"
+  name = "git.apache.org/thrift.git"
+  source = "github.com/apache/thrift"
+
+[[constraint]]
+  name = "github.com/golang/protobuf"
+  version = "1.0.0"
+
+[[constraint]]
+  name = "github.com/openzipkin/zipkin-go"
+  version = "0.1.0"
+
+[[constraint]]
+  name = "github.com/prometheus/client_golang"
+  version = "0.8.0"
+
+[[constraint]]
+  branch = "master"
+  name = "golang.org/x/net"
+
+[[constraint]]
+  branch = "master"
+  name = "golang.org/x/oauth2"
+
+[[constraint]]
+  branch = "master"
+  name = "google.golang.org/api"
+
+[[constraint]]
+  branch = "master"
+  name = "google.golang.org/genproto"
+
+[[constraint]]
+  name = "google.golang.org/grpc"
+  version = "1.11.3"
+
+[prune]
+  go-tests = true
+  unused-packages = true

vendor/go.opencensus.io/README.md

@@ -9,16 +9,15 @@ OpenCensus Go is a Go implementation of OpenCensus, a toolkit for
 collecting application performance and behavior monitoring data.
 Currently it consists of three major components: tags, stats, and tracing.
 
-This project is still at a very early stage of development. The API is changing
-rapidly, vendoring is recommended.
-
-
 ## Installation
 
 ```
 $ go get -u go.opencensus.io
 ```
 
+The API of this project is still evolving, see: [Deprecation Policy](#deprecation-policy).
+The use of vendoring or a dependency management tool is recommended.
+
 ## Prerequisites
 
 OpenCensus Go libraries require Go 1.8 or later.
@@ -53,17 +52,14 @@ then add additional custom instrumentation if needed.
 
 ## Tags
 
-Tags represent propagated key-value pairs. They are propagated using context.Context
-in the same process or can be encoded to be transmitted on the wire and decoded back
-to a tag.Map at the destination.
+Tags represent propagated key-value pairs. They are propagated using `context.Context`
+in the same process or can be encoded to be transmitted on the wire. Usually, this will
+be handled by an integration plugin, e.g. `ocgrpc.ServerHandler` and `ocgrpc.ClientHandler`
+for gRPC.
 
-Package tag provides a builder to create tag maps and put it
-into the current context.
-To propagate a tag map to downstream methods and RPCs, New
-will add the produced tag map to the current context.
-If there is already a tag map in the current context, it will be replaced.
+Package tag allows adding or modifying tags in the current context.
 
-[embedmd]:# (tags.go new)
+[embedmd]:# (internal/readme/tags.go new)
 ```go
 ctx, err = tag.New(ctx,
 	tag.Insert(osKey, "macOS-10.12.5"),
@@ -91,7 +87,7 @@ Measurements are data points associated with a measure.
 Recording implicitly tags the set of Measurements with the tags from the
 provided context:
 
-[embedmd]:# (stats.go record)
+[embedmd]:# (internal/readme/stats.go record)
 ```go
 stats.Record(ctx, videoSize.M(102478))
 ```
@@ -103,25 +99,23 @@ set of recorded data points (measurements).
 
 Views have two parts: the tags to group by and the aggregation type used.
 
-Currently four types of aggregations are supported:
+Currently three types of aggregations are supported:
 * CountAggregation is used to count the number of times a sample was recorded.
 * DistributionAggregation is used to provide a histogram of the values of the samples.
 * SumAggregation is used to sum up all sample values.
-* MeanAggregation is used to calculate the mean of sample values.
 
-[embedmd]:# (stats.go aggs)
+[embedmd]:# (internal/readme/stats.go aggs)
 ```go
 distAgg := view.Distribution(0, 1<<32, 2<<32, 3<<32)
 countAgg := view.Count()
 sumAgg := view.Sum()
-meanAgg := view.Mean()
 ```
 
 Here we create a view with the DistributionAggregation over our measure.
 
-[embedmd]:# (stats.go view)
+[embedmd]:# (internal/readme/stats.go view)
 ```go
-if err = view.Subscribe(&view.View{
+if err := view.Register(&view.View{
 	Name:        "my.org/video_size_distribution",
 	Description: "distribution of processed video size over time",
 	Measure:     videoSize,
@@ -136,7 +130,7 @@ exported via the registered exporters.
 
 ## Traces
 
-[embedmd]:# (trace.go startend)
+[embedmd]:# (internal/readme/trace.go startend)
 ```go
 ctx, span := trace.StartSpan(ctx, "your choice of name")
 defer span.End()
@@ -147,7 +141,7 @@ defer span.End()
 OpenCensus tags can be applied as profiler labels
 for users who are on Go 1.9 and above.
 
-[embedmd]:# (tags.go profiler)
+[embedmd]:# (internal/readme/tags.go profiler)
 ```go
 ctx, err = tag.New(ctx,
 	tag.Insert(osKey, "macOS-10.12.5"),
@@ -167,6 +161,15 @@ A screenshot of the CPU profile from the program above:
 
 ![CPU profile](https://i.imgur.com/jBKjlkw.png)
 
+## Deprecation Policy
+
+Before version 1.0.0, the following deprecation policy will be observed:
+
+No backwards-incompatible changes will be made except for the removal of symbols that have
+been marked as *Deprecated* for at least one minor release (e.g. 0.9.0 to 0.10.0). A release
+removing the *Deprecated* functionality will be made no sooner than 28 days after the first 
+release in which the functionality was marked *Deprecated*.
+
 [travis-image]: https://travis-ci.org/census-instrumentation/opencensus-go.svg?branch=master
 [travis-url]: https://travis-ci.org/census-instrumentation/opencensus-go
 [appveyor-image]: https://ci.appveyor.com/api/projects/status/vgtt29ps1783ig38?svg=true
@@ -181,7 +184,7 @@ A screenshot of the CPU profile from the program above:
 [new-replace-ex]: https://godoc.org/go.opencensus.io/tag#example-NewMap--Replace
 
 [exporter-prom]: https://godoc.org/go.opencensus.io/exporter/prometheus
-[exporter-stackdriver]: https://godoc.org/go.opencensus.io/exporter/stackdriver
+[exporter-stackdriver]: https://godoc.org/contrib.go.opencensus.io/exporter/stackdriver
 [exporter-zipkin]: https://godoc.org/go.opencensus.io/exporter/zipkin
 [exporter-jaeger]: https://godoc.org/go.opencensus.io/exporter/jaeger
 [exporter-xray]: https://github.com/census-instrumentation/opencensus-go-exporter-aws

vendor/go.opencensus.io/examples/exporter/exporter.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package exporter
+package exporter // import "go.opencensus.io/examples/exporter"
 
 import (
 	"log"

vendor/go.opencensus.io/examples/grpc/README.md

@@ -7,7 +7,7 @@ This example uses:
 * Debugging exporters to print stats and traces to stdout.
 
 ```
-$ go get go.opencensus.io/examples/grpc
+$ go get go.opencensus.io/examples/grpc/...
 ```
 
 First, run the server:

vendor/go.opencensus.io/examples/grpc/helloworld_client/main.go

@@ -37,8 +37,8 @@ func main() {
 	// the collected data.
 	view.RegisterExporter(&exporter.PrintExporter{})
 
-	// Subscribe to collect client request count.
-	if err := ocgrpc.ClientErrorCountView.Subscribe(); err != nil {
+	// Register the view to collect gRPC client stats.
+	if err := view.Register(ocgrpc.DefaultClientViews...); err != nil {
 		log.Fatal(err)
 	}
 

vendor/go.opencensus.io/examples/grpc/helloworld_server/main.go

@@ -31,7 +31,6 @@ import (
 	"go.opencensus.io/zpages"
 	"golang.org/x/net/context"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/reflection"
 )
 
 const port = ":50051"
@@ -56,8 +55,8 @@ func main() {
 	// the collected data.
 	view.RegisterExporter(&exporter.PrintExporter{})
 
-	// Subscribe to collect server request count.
-	if err := view.Subscribe(ocgrpc.DefaultServerViews...); err != nil {
+	// Register the views to collect server request count.
+	if err := view.Register(ocgrpc.DefaultServerViews...); err != nil {
 		log.Fatal(err)
 	}
 
@@ -70,8 +69,7 @@ func main() {
 	// stats handler to enable stats and tracing.
 	s := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
 	pb.RegisterGreeterServer(s, &server{})
-	// Register reflection service on gRPC server.
-	reflection.Register(s)
+
 	if err := s.Serve(lis); err != nil {
 		log.Fatalf("Failed to serve: %v", err)
 	}

vendor/go.opencensus.io/examples/grpc/proto/helloworld.pb.go

@@ -11,7 +11,7 @@ It has these top-level messages:
 	HelloRequest
 	HelloReply
 */
-package helloworld
+package helloworld // import "go.opencensus.io/examples/grpc/proto"
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"

vendor/go.opencensus.io/examples/helloworld/main.go

@@ -53,15 +53,12 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	videoSize, err = stats.Int64("my.org/measure/video_size", "size of processed videos", "MBy")
-	if err != nil {
-		log.Fatalf("Video size measure not created: %v", err)
-	}
+	videoSize = stats.Int64("my.org/measure/video_size", "size of processed videos", stats.UnitBytes)
 
 	// Create view to see the processed video size
 	// distribution broken down by frontend.
-	// Subscribe will allow view data to be exported.
-	if err := view.Subscribe(&view.View{
+	// Register will allow view data to be exported.
+	if err := view.Register(&view.View{
 		Name:        "my.org/views/video_size",
 		Description: "processed video size over time",
 		TagKeys:     []tag.Key{frontendKey},

vendor/go.opencensus.io/examples/http/README.md

@@ -7,7 +7,7 @@ This example uses:
 * Debugging exporters to print stats and traces to stdout.
 
 ```
-$ go get go.opencensus.io/examples/http
+$ go get go.opencensus.io/examples/http/...
 ```
 
 First, run the server:

vendor/go.opencensus.io/examples/http/helloworld_client/main.go

@@ -35,7 +35,7 @@ func main() {
 	trace.RegisterExporter(exporter)
 
 	// Always trace for this demo.
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 	// Report stats at every second.
 	view.SetReportingPeriod(1 * time.Second)

vendor/go.opencensus.io/examples/http/helloworld_server/main.go

@@ -37,7 +37,7 @@ func main() {
 	trace.RegisterExporter(exporter)
 
 	// Always trace for this demo.
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 	// Report stats at every second.
 	view.SetReportingPeriod(1 * time.Second)
@@ -50,12 +50,14 @@ func main() {
 		r, _ := http.NewRequest("GET", "https://example.com", nil)
 
 		// Propagate the trace header info in the outgoing requests.
-		r = req.WithContext(req.Context())
+		r = r.WithContext(req.Context())
 		resp, err := client.Do(r)
 		if err != nil {
 			log.Println(err)
+		} else {
+			// TODO: handle response
+			resp.Body.Close()
 		}
-		_ = resp // handle response
 	})
 	log.Fatal(http.ListenAndServe(":50030", &ochttp.Handler{}))
 }

vendor/go.opencensus.io/exporter/jaeger/example/main.go

@@ -39,7 +39,7 @@ func main() {
 	trace.RegisterExporter(exporter)
 
 	// For demoing purposes, always sample.
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 	ctx, span := trace.StartSpan(ctx, "/foo")
 	bar(ctx)

vendor/go.opencensus.io/exporter/jaeger/internal/gen-go/jaeger/jaeger.go

@@ -1,7 +1,7 @@
 // Autogenerated by Thrift Compiler (0.11.0)
 // DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
 
-package jaeger
+package jaeger // import "go.opencensus.io/exporter/jaeger/internal/gen-go/jaeger"
 
 import (
 	"bytes"

vendor/go.opencensus.io/exporter/jaeger/jaeger_test.go

@@ -98,7 +98,7 @@ func Test_spanDataToThrift(t *testing.T) {
 						},
 					},
 				},
-				Status: trace.Status{Code: 2, Message: "error"},
+				Status: trace.Status{Code: trace.StatusCodeUnknown, Message: "error"},
 			},
 			want: &gen.Span{
 				TraceIdLow:    651345242494996240,

vendor/go.opencensus.io/exporter/prometheus/example/main.go

@@ -28,6 +28,13 @@ import (
 	"go.opencensus.io/stats/view"
 )
 
+// Create measures. The program will record measures for the size of
+// processed videos and the number of videos marked as spam.
+var (
+	videoCount = stats.Int64("my.org/measures/video_count", "number of processed videos", stats.UnitDimensionless)
+	videoSize  = stats.Int64("my.org/measures/video_size", "size of processed video", stats.UnitBytes)
+)
+
 func main() {
 	ctx := context.Background()
 
@@ -37,22 +44,11 @@ func main() {
 	}
 	view.RegisterExporter(exporter)
 
-	// Create measures. The program will record measures for the size of
-	// processed videos and the number of videos marked as spam.
-	videoCount, err := stats.Int64("my.org/measures/video_count", "number of processed videos", "")
-	if err != nil {
-		log.Fatalf("Video count measure not created: %v", err)
-	}
-	videoSize, err := stats.Int64("my.org/measures/video_size", "size of processed video", "MBy")
-	if err != nil {
-		log.Fatalf("Video size measure not created: %v", err)
-	}
-
 	// Create view to see the number of processed videos cumulatively.
 	// Create view to see the amount of video processed
 	// Subscribe will allow view data to be exported.
 	// Once no longer needed, you can unsubscribe from the view.
-	if err = view.Subscribe(
+	if err = view.Register(
 		&view.View{
 			Name:        "video_count",
 			Description: "number of videos processed over time",

vendor/go.opencensus.io/exporter/prometheus/prometheus.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"sort"
 	"sync"
 
 	"go.opencensus.io/internal"
@@ -33,10 +34,6 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
-const (
-	defaultNamespace = "opencensus"
-)
-
 // Exporter exports stats to Prometheus, users need
 // to register the exporter as an http.Handler to be
 // able to export.
@@ -71,9 +68,6 @@ func NewExporter(o Options) (*Exporter, error) {
 }
 
 func newExporter(o Options) (*Exporter, error) {
-	if o.Namespace == "" {
-		o.Namespace = defaultNamespace
-	}
 	if o.Registry == nil {
 		o.Registry = prometheus.NewRegistry()
 	}
@@ -144,10 +138,8 @@ func (o *Options) onError(err error) {
 // ExportView exports to the Prometheus if view data has one or more rows.
 // Each OpenCensus AggregationData will be converted to
 // corresponding Prometheus Metric: SumData will be converted
-// to Untyped Metric, CountData will be Counter Metric,
-// DistributionData will be Histogram Metric, and MeanData
-// will be Summary Metric. Please note the Summary Metric from
-// MeanData does not have any quantiles.
+// to Untyped Metric, CountData will be a Counter Metric,
+// DistributionData will be a Histogram Metric.
 func (e *Exporter) ExportView(vd *view.Data) {
 	if len(vd.Rows) == 0 {
 		return
@@ -232,20 +224,40 @@ func (c *collector) Collect(ch chan<- prometheus.Metric) {
 func (c *collector) toMetric(desc *prometheus.Desc, v *view.View, row *view.Row) (prometheus.Metric, error) {
 	switch data := row.Data.(type) {
 	case *view.CountData:
-		return prometheus.NewConstMetric(desc, prometheus.CounterValue, float64(*data), tagValues(row.Tags)...)
+		return prometheus.NewConstMetric(desc, prometheus.CounterValue, float64(data.Value), tagValues(row.Tags)...)
 
 	case *view.DistributionData:
 		points := make(map[float64]uint64)
+		// Histograms are cumulative in Prometheus.
+		// 1. Sort buckets in ascending order but, retain
+		// their indices for reverse lookup later on.
+		// TODO: If there is a guarantee that distribution elements
+		// are always sorted, then skip the sorting.
+		indicesMap := make(map[float64]int)
+		buckets := make([]float64, 0, len(v.Aggregation.Buckets))
 		for i, b := range v.Aggregation.Buckets {
-			points[b] = uint64(data.CountPerBucket[i])
+			if _, ok := indicesMap[b]; !ok {
+				indicesMap[b] = i
+				buckets = append(buckets, b)
+			}
+		}
+		sort.Float64s(buckets)
+
+		// 2. Now that the buckets are sorted by magnitude
+		// we can create cumulative indicesmap them back by reverse index
+		cumCount := uint64(0)
+		for _, b := range buckets {
+			i := indicesMap[b]
+			cumCount += uint64(data.CountPerBucket[i])
+			points[b] = cumCount
 		}
 		return prometheus.NewConstHistogram(desc, uint64(data.Count), data.Sum(), points, tagValues(row.Tags)...)
 
-	case *view.MeanData:
-		return prometheus.NewConstSummary(desc, uint64(data.Count), data.Sum(), make(map[float64]float64), tagValues(row.Tags)...)
-
 	case *view.SumData:
-		return prometheus.NewConstMetric(desc, prometheus.UntypedValue, float64(*data), tagValues(row.Tags)...)
+		return prometheus.NewConstMetric(desc, prometheus.UntypedValue, data.Value, tagValues(row.Tags)...)
+
+	case *view.LastValueData:
+		return prometheus.NewConstMetric(desc, prometheus.UntypedValue, data.Value, tagValues(row.Tags)...)
 
 	default:
 		return nil, fmt.Errorf("aggregation %T is not yet supported", v.Aggregation)
@@ -285,7 +297,11 @@ func tagValues(t []tag.Tag) []string {
 }
 
 func viewName(namespace string, v *view.View) string {
-	return namespace + "_" + internal.Sanitize(v.Name)
+	var name string
+	if namespace != "" {
+		name = namespace + "_"
+	}
+	return name + internal.Sanitize(v.Name)
 }
 
 func viewSignature(namespace string, v *view.View) string {

vendor/go.opencensus.io/exporter/prometheus/prometheus_test.go

@@ -18,7 +18,6 @@ import (
 	"context"
 	"fmt"
 	"io/ioutil"
-	"log"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -34,10 +33,7 @@ import (
 )
 
 func newView(measureName string, agg *view.Aggregation) *view.View {
-	m, err := stats.Int64(measureName, "bytes", stats.UnitBytes)
-	if err != nil {
-		log.Fatal(err)
-	}
+	m := stats.Int64(measureName, "bytes", stats.UnitBytes)
 	return &view.View{
 		Name:        "foo",
 		Description: "bar",
@@ -48,11 +44,7 @@ func newView(measureName string, agg *view.Aggregation) *view.View {
 
 func TestOnlyCumulativeWindowSupported(t *testing.T) {
 	// See Issue https://github.com/census-instrumentation/opencensus-go/issues/214.
-	count1 := view.CountData(1)
-	mean1 := view.MeanData{
-		Mean:  4.5,
-		Count: 5,
-	}
+	count1 := &view.CountData{Value: 1}
 	tests := []struct {
 		vds  *view.Data
 		want int
@@ -67,16 +59,7 @@ func TestOnlyCumulativeWindowSupported(t *testing.T) {
 			vds: &view.Data{
 				View: newView("TestOnlyCumulativeWindowSupported/m2", view.Count()),
 				Rows: []*view.Row{
-					{Data: &count1},
-				},
-			},
-			want: 1,
-		},
-		2: {
-			vds: &view.Data{
-				View: newView("TestOnlyCumulativeWindowSupported/m3", view.Mean()),
-				Rows: []*view.Row{
-					{Data: &mean1},
+					{Data: count1},
 				},
 			},
 			want: 1,
@@ -143,11 +126,9 @@ func TestCollectNonRacy(t *testing.T) {
 		}()
 
 		for i := 0; i < 1e3; i++ {
-			count1 := view.CountData(1)
-			mean1 := &view.MeanData{Mean: 4.5, Count: 5}
+			count1 := &view.CountData{Value: 1}
 			vds := []*view.Data{
-				{View: newView(fmt.Sprintf("TestCollectNonRacy/m1-%d", i), view.Mean()), Rows: []*view.Row{{Data: mean1}}},
-				{View: newView(fmt.Sprintf("TestCollectNonRacy/m2-%d", i), view.Count()), Rows: []*view.Row{{Data: &count1}}},
+				{View: newView(fmt.Sprintf("TestCollectNonRacy/m2-%d", i), view.Count()), Rows: []*view.Row{{Data: count1}}},
 			}
 			for _, v := range vds {
 				exp.ExportView(v)
@@ -190,28 +171,24 @@ func TestCollectNonRacy(t *testing.T) {
 	}()
 }
 
-type mCreator struct {
-	m   *stats.Int64Measure
-	err error
-}
-
 type mSlice []*stats.Int64Measure
 
-func (mc *mCreator) createAndAppend(measures *mSlice, name, desc, unit string) {
-	mc.m, mc.err = stats.Int64(name, desc, unit)
-	*measures = append(*measures, mc.m)
+func (measures *mSlice) createAndAppend(name, desc, unit string) {
+	m := stats.Int64(name, desc, unit)
+	*measures = append(*measures, m)
 }
 
-type vCreator struct {
-	v   *view.View
-	err error
-}
+type vCreator []*view.View
 
-func (vc *vCreator) createAndSubscribe(name, description string, keys []tag.Key, measure stats.Measure, agg *view.Aggregation) {
-	vc.v, vc.err = view.New(name, description, keys, measure, agg)
-	if err := vc.v.Subscribe(); err != nil {
-		vc.err = err
+func (vc *vCreator) createAndAppend(name, description string, keys []tag.Key, measure stats.Measure, agg *view.Aggregation) {
+	v := &view.View{
+		Name:        name,
+		Description: description,
+		TagKeys:     keys,
+		Measure:     measure,
+		Aggregation: agg,
 	}
+	*vc = append(*vc, v)
 }
 
 func TestMetricsEndpointOutput(t *testing.T) {
@@ -223,22 +200,21 @@ func TestMetricsEndpointOutput(t *testing.T) {
 
 	names := []string{"foo", "bar", "baz"}
 
-	measures := make(mSlice, 0)
-	mc := &mCreator{}
+	var measures mSlice
 	for _, name := range names {
-		mc.createAndAppend(&measures, "tests/"+name, name, "")
-	}
-	if mc.err != nil {
-		t.Errorf("failed to create measures: %v", err)
+		measures.createAndAppend("tests/"+name, name, "")
 	}
 
-	vc := &vCreator{}
+	var vc vCreator
 	for _, m := range measures {
-		vc.createAndSubscribe(m.Name(), m.Description(), nil, m, view.Count())
+		vc.createAndAppend(m.Name(), m.Description(), nil, m, view.Count())
 	}
-	if vc.err != nil {
+
+	if err := view.Register(vc...); err != nil {
 		t.Fatalf("failed to create views: %v", err)
 	}
+	defer view.Unregister(vc...)
+
 	view.SetReportingPeriod(time.Millisecond)
 
 	for _, m := range measures {
@@ -251,7 +227,8 @@ func TestMetricsEndpointOutput(t *testing.T) {
 	var i int
 	var output string
 	for {
-		if i == 10000 {
+		time.Sleep(10 * time.Millisecond)
+		if i == 1000 {
 			t.Fatal("no output at /metrics (10s wait)")
 		}
 		i++
@@ -271,7 +248,6 @@ func TestMetricsEndpointOutput(t *testing.T) {
 		if output != "" {
 			break
 		}
-		time.Sleep(time.Millisecond)
 	}
 
 	if strings.Contains(output, "collected before with the same name and label values") {
@@ -283,8 +259,95 @@ func TestMetricsEndpointOutput(t *testing.T) {
 	}
 
 	for _, name := range names {
-		if !strings.Contains(output, "opencensus_tests_"+name+" 1") {
+		if !strings.Contains(output, "tests_"+name+" 1") {
 			t.Fatalf("measurement missing in output: %v", name)
 		}
 	}
 }
+
+func TestCumulativenessFromHistograms(t *testing.T) {
+	exporter, err := newExporter(Options{})
+	if err != nil {
+		t.Fatalf("failed to create prometheus exporter: %v", err)
+	}
+	view.RegisterExporter(exporter)
+	reportPeriod := time.Millisecond
+	view.SetReportingPeriod(reportPeriod)
+
+	m := stats.Float64("tests/bills", "payments by denomination", stats.UnitDimensionless)
+	v := &view.View{
+		Name:        "cash/register",
+		Description: "this is a test",
+		Measure:     m,
+
+		// Intentionally used repeated elements in the ascending distribution.
+		// to ensure duplicate distribution items are handles.
+		Aggregation: view.Distribution(1, 5, 5, 5, 5, 10, 20, 50, 100, 250),
+	}
+
+	if err := view.Register(v); err != nil {
+		t.Fatalf("Register error: %v", err)
+	}
+	defer view.Unregister(v)
+
+	// Give the reporter ample time to process registration
+	<-time.After(10 * reportPeriod)
+
+	values := []float64{0.25, 245.67, 12, 1.45, 199.9, 7.69, 187.12}
+	// We want the results that look like this:
+	// 1:   [0.25]      		| 1 + prev(i) = 1 + 0 = 1
+	// 5:   [1.45]			| 1 + prev(i) = 1 + 1 = 2
+	// 10:	[]			| 1 + prev(i) = 1 + 2 = 3
+	// 20:  [12]			| 1 + prev(i) = 1 + 3 = 4
+	// 50:  []			| 0 + prev(i) = 0 + 4 = 4
+	// 100: []			| 0 + prev(i) = 0 + 4 = 4
+	// 250: [187.12, 199.9, 245.67]	| 3 + prev(i) = 3 + 4 = 7
+	wantLines := []string{
+		`cash_register_bucket{le="1"} 1`,
+		`cash_register_bucket{le="5"} 2`,
+		`cash_register_bucket{le="10"} 3`,
+		`cash_register_bucket{le="20"} 4`,
+		`cash_register_bucket{le="50"} 4`,
+		`cash_register_bucket{le="100"} 4`,
+		`cash_register_bucket{le="250"} 7`,
+		`cash_register_bucket{le="+Inf"} 7`,
+		`cash_register_sum 654.0799999999999`, // Summation of the input values
+		`cash_register_count 7`,
+	}
+
+	ctx := context.Background()
+	ms := make([]stats.Measurement, len(values))
+	for _, value := range values {
+		mx := m.M(value)
+		ms = append(ms, mx)
+	}
+	stats.Record(ctx, ms...)
+
+	// Give the recorder ample time to process recording
+	<-time.After(10 * reportPeriod)
+
+	cst := httptest.NewServer(exporter)
+	defer cst.Close()
+	res, err := http.Get(cst.URL)
+	if err != nil {
+		t.Fatalf("http.Get error: %v", err)
+	}
+	blob, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Fatalf("Read body error: %v", err)
+	}
+	str := strings.Trim(string(blob), "\n")
+	lines := strings.Split(str, "\n")
+	nonComments := make([]string, 0, len(lines))
+	for _, line := range lines {
+		if !strings.Contains(line, "#") {
+			nonComments = append(nonComments, line)
+		}
+	}
+
+	got := strings.Join(nonComments, "\n")
+	want := strings.Join(wantLines, "\n")
+	if got != want {
+		t.Fatalf("\ngot:\n%s\n\nwant:\n%s\n", got, want)
+	}
+}

vendor/go.opencensus.io/exporter/stackdriver/example_test.go

@@ -1,58 +0,0 @@
-// Copyright 2018, OpenCensus Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package stackdriver_test
-
-import (
-	"log"
-	"net/http"
-
-	"go.opencensus.io/exporter/stackdriver"
-	"go.opencensus.io/exporter/stackdriver/propagation"
-	"go.opencensus.io/plugin/ochttp"
-	"go.opencensus.io/stats/view"
-	"go.opencensus.io/trace"
-)
-
-func Example() {
-	exporter, err := stackdriver.NewExporter(stackdriver.Options{ProjectID: "google-project-id"})
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	// Export to Stackdriver Monitoring.
-	view.RegisterExporter(exporter)
-
-	// Subscribe views to see stats in Stackdriver Monitoring.
-	if err := view.Subscribe(
-		ochttp.ClientLatencyView,
-		ochttp.ClientResponseBytesView,
-	); err != nil {
-		log.Fatal(err)
-	}
-
-	// Export to Stackdriver Trace.
-	trace.RegisterExporter(exporter)
-
-	// Automatically add a Stackdriver trace header to outgoing requests:
-	client := &http.Client{
-		Transport: &ochttp.Transport{
-			Propagation: &propagation.HTTPFormat{},
-		},
-	}
-	_ = client // use client
-
-	// All outgoing requests from client will include a Stackdriver Trace header.
-	// See the ochttp package for how to handle incoming requests.
-}

vendor/go.opencensus.io/exporter/stackdriver/examples/stats/main.go

@@ -28,6 +28,10 @@ import (
 	"go.opencensus.io/stats/view"
 )
 
+// Create measures. The program will record measures for the size of
+// processed videos and the nubmer of videos marked as spam.
+var videoSize = stats.Int64("my.org/measure/video_size", "size of processed videos", stats.UnitBytes)
+
 func main() {
 	ctx := context.Background()
 
@@ -49,20 +53,13 @@ func main() {
 	}
 	view.RegisterExporter(exporter)
 
-	// Create measures. The program will record measures for the size of
-	// processed videos and the nubmer of videos marked as spam.
-	videoSize, err := stats.Int64("my.org/measure/video_size", "size of processed videos", "MBy")
-	if err != nil {
-		log.Fatalf("Video size measure not created: %v", err)
-	}
-
 	// Set reporting period to report data at every second.
 	view.SetReportingPeriod(1 * time.Second)
 
 	// Create view to see the processed video size cumulatively.
 	// Subscribe will allow view data to be exported.
 	// Once no longer need, you can unsubscribe from the view.
-	if err := view.Subscribe(&view.View{
+	if err := view.Register(&view.View{
 		Name:        "my.org/views/video_size_cum",
 		Description: "processed video size over time",
 		Measure:     videoSize,
@@ -71,11 +68,15 @@ func main() {
 		log.Fatalf("Cannot subscribe to the view: %v", err)
 	}
 
-	// Record data points.
-	stats.Record(ctx, videoSize.M(25648))
+	processVideo(ctx)
 
 	// Wait for a duration longer than reporting duration to ensure the stats
 	// library reports the collected data.
 	fmt.Println("Wait longer than the reporting duration...")
 	time.Sleep(1 * time.Minute)
 }
+
+func processVideo(ctx context.Context) {
+	// Do some processing and record stats.
+	stats.Record(ctx, videoSize.M(25648))
+}

vendor/go.opencensus.io/exporter/stackdriver/stackdriver.go

@@ -12,19 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package stackdriver contains the OpenCensus exporters for
-// Stackdriver Monitoring and Stackdriver Tracing.
+// Package stackdriver has moved.
 //
-// Please note that the Stackdriver exporter is currently experimental.
-//
-// The package uses Application Default Credentials to authenticate.  See
-// https://developers.google.com/identity/protocols/application-default-credentials
+// Deprecated: Use contrib.go.opencensus.io/exporter/stackdriver instead.
 package stackdriver // import "go.opencensus.io/exporter/stackdriver"
 
 import (
 	"context"
 	"errors"
 	"fmt"
+	"log"
 	"time"
 
 	traceapi "cloud.google.com/go/trace/apiv2"
@@ -49,10 +46,15 @@ type Options struct {
 	// Optional.
 	OnError func(err error)
 
-	// ClientOptions are additional options to be passed
+	// MonitoringClientOptions are additional options to be passed
 	// to the underlying Stackdriver Monitoring API client.
 	// Optional.
-	ClientOptions []option.ClientOption
+	MonitoringClientOptions []option.ClientOption
+
+	// TraceClientOptions are additional options to be passed
+	// to the underlying Stackdriver Trace API client.
+	// Optional.
+	TraceClientOptions []option.ClientOption
 
 	// BundleDelayThreshold determines the max amount of time
 	// the exporter can wait before uploading view data to
@@ -130,3 +132,11 @@ func (e *Exporter) Flush() {
 	e.statsExporter.Flush()
 	e.traceExporter.Flush()
 }
+
+func (o Options) handleError(err error) {
+	if o.OnError != nil {
+		o.OnError(err)
+		return
+	}
+	log.Printf("Error exporting to Stackdriver: %v", err)
+}

vendor/go.opencensus.io/exporter/stackdriver/stackdriver_test.go

@@ -36,7 +36,11 @@ func TestExport(t *testing.T) {
 		t.Skip("STACKDRIVER_TEST_PROJECT_ID not set")
 	}
 
-	exporter, err := NewExporter(Options{ProjectID: projectID})
+	var exportErrors []error
+
+	exporter, err := NewExporter(Options{ProjectID: projectID, OnError: func(err error) {
+		exportErrors = append(exportErrors, err)
+	}})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -47,16 +51,24 @@ func TestExport(t *testing.T) {
 	view.RegisterExporter(exporter)
 	defer view.UnregisterExporter(exporter)
 
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
-	span := trace.NewSpan("custom-span", nil, trace.StartOptions{})
+	_, span := trace.StartSpan(context.Background(), "custom-span")
 	time.Sleep(10 * time.Millisecond)
 	span.End()
 
 	// Test HTTP spans
 
 	handler := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		_, backgroundSpan := trace.StartSpan(context.Background(), "BackgroundWork")
+		spanContext := backgroundSpan.SpanContext()
+		time.Sleep(10 * time.Millisecond)
+		backgroundSpan.End()
+
+		_, span := trace.StartSpan(req.Context(), "Sleep")
+		span.AddLink(trace.Link{Type: trace.LinkTypeChild, TraceID: spanContext.TraceID, SpanID: spanContext.SpanID})
 		time.Sleep(150 * time.Millisecond) // do work
+		span.End()
 		rw.Write([]byte("Hello, world!"))
 	})
 	server := httptest.NewServer(&ochttp.Handler{Handler: handler})
@@ -81,6 +93,10 @@ func TestExport(t *testing.T) {
 	// Flush twice to expose issue of exporter creating traces internally (#557)
 	exporter.Flush()
 	exporter.Flush()
+
+	for _, err := range exportErrors {
+		t.Error(err)
+	}
 }
 
 func TestGRPC(t *testing.T) {
@@ -100,7 +116,7 @@ func TestGRPC(t *testing.T) {
 	view.RegisterExporter(exporter)
 	defer view.UnregisterExporter(exporter)
 
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 	client, done := testpb.NewTestClient(t)
 	defer done()

vendor/go.opencensus.io/exporter/stackdriver/stats.go

@@ -18,8 +18,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"log"
-	"net/url"
 	"os"
 	"path"
 	"strconv"
@@ -28,6 +26,7 @@ import (
 	"time"
 
 	"go.opencensus.io/internal"
+	"go.opencensus.io/stats"
 	"go.opencensus.io/stats/view"
 	"go.opencensus.io/tag"
 	"go.opencensus.io/trace"
@@ -42,8 +41,6 @@ import (
 	metricpb "google.golang.org/genproto/googleapis/api/metric"
 	monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres"
 	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/codes"
 )
 
 const maxTimeSeriesPerUpload = 200
@@ -92,7 +89,7 @@ func newStatsExporter(o Options) (*statsExporter, error) {
 
 	seenProjects[o.ProjectID] = true
 
-	opts := append(o.ClientOptions, option.WithUserAgent(internal.UserAgent))
+	opts := append(o.MonitoringClientOptions, option.WithUserAgent(internal.UserAgent))
 	client, err := monitoring.NewMetricClient(context.Background(), opts...)
 	if err != nil {
 		return nil, err
@@ -125,9 +122,9 @@ func (e *statsExporter) ExportView(vd *view.Data) {
 	case bundler.ErrOversizedItem:
 		go e.handleUpload(vd)
 	case bundler.ErrOverflow:
-		e.onError(errors.New("failed to upload: buffer full"))
+		e.o.handleError(errors.New("failed to upload: buffer full"))
 	default:
-		e.onError(err)
+		e.o.handleError(err)
 	}
 }
 
@@ -145,7 +142,7 @@ func getTaskValue() string {
 // of Data, as well as error handling.
 func (e *statsExporter) handleUpload(vds ...*view.Data) {
 	if err := e.uploadStats(vds); err != nil {
-		e.onError(err)
+		e.o.handleError(err)
 	}
 }
 
@@ -157,32 +154,23 @@ func (e *statsExporter) Flush() {
 	e.bundler.Flush()
 }
 
-func (e *statsExporter) onError(err error) {
-	if e.o.OnError != nil {
-		e.o.OnError(err)
-		return
-	}
-	log.Printf("Failed to export to Stackdriver Monitoring: %v", err)
-}
-
 func (e *statsExporter) uploadStats(vds []*view.Data) error {
-	span := trace.NewSpan(
+	ctx, span := trace.StartSpan(
+		context.Background(),
 		"go.opencensus.io/exporter/stackdriver.uploadStats",
-		nil,
-		trace.StartOptions{Sampler: trace.NeverSample()},
+		trace.WithSampler(trace.NeverSample()),
 	)
-	ctx := trace.WithSpan(context.Background(), span)
 	defer span.End()
 
 	for _, vd := range vds {
 		if err := e.createMeasure(ctx, vd); err != nil {
-			span.SetStatus(trace.Status{Code: 2, Message: err.Error()})
+			span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
 			return err
 		}
 	}
 	for _, req := range e.makeReq(vds, maxTimeSeriesPerUpload) {
 		if err := e.c.CreateTimeSeries(ctx, req); err != nil {
-			span.SetStatus(trace.Status{Code: 2, Message: err.Error()})
+			span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
 			// TODO(jbd): Don't fail fast here, batch errors?
 			return err
 		}
@@ -205,7 +193,7 @@ func (e *statsExporter) makeReq(vds []*view.Data, limit int) []*monitoringpb.Cre
 		for _, row := range vd.Rows {
 			ts := &monitoringpb.TimeSeries{
 				Metric: &metricpb.Metric{
-					Type:   namespacedViewName(vd.View.Name, false),
+					Type:   namespacedViewName(vd.View.Name),
 					Labels: newLabels(row.Tags, e.taskValue),
 				},
 				Resource: resource,
@@ -243,53 +231,53 @@ func (e *statsExporter) createMeasure(ctx context.Context, vd *view.Data) error
 	viewName := vd.View.Name
 
 	if md, ok := e.createdViews[viewName]; ok {
-		return equalAggTagKeys(md, agg, tagKeys)
+		return equalMeasureAggTagKeys(md, m, agg, tagKeys)
 	}
 
-	metricName := monitoring.MetricMetricDescriptorPath(e.o.ProjectID, namespacedViewName(viewName, true))
-	md, err := getMetricDescriptor(ctx, e.c, &monitoringpb.GetMetricDescriptorRequest{
-		Name: metricName,
-	})
-	if err == nil {
-		if err := equalAggTagKeys(md, agg, tagKeys); err != nil {
-			return err
-		}
-		e.createdViews[viewName] = md
-		return nil
-	}
-	if grpc.Code(err) != codes.NotFound {
-		return err
-	}
-
-	var metricKind metricpb.MetricDescriptor_MetricKind
+	metricType := namespacedViewName(viewName)
 	var valueType metricpb.MetricDescriptor_ValueType
+	unit := m.Unit()
 
 	switch agg.Type {
 	case view.AggTypeCount:
 		valueType = metricpb.MetricDescriptor_INT64
+		// If the aggregation type is count, which counts the number of recorded measurements, the unit must be "1",
+		// because this view does not apply to the recorded values.
+		unit = stats.UnitDimensionless
 	case view.AggTypeSum:
-		valueType = metricpb.MetricDescriptor_DOUBLE
-	case view.AggTypeMean:
-		valueType = metricpb.MetricDescriptor_DISTRIBUTION
+		switch m.(type) {
+		case *stats.Int64Measure:
+			valueType = metricpb.MetricDescriptor_INT64
+		case *stats.Float64Measure:
+			valueType = metricpb.MetricDescriptor_DOUBLE
+		}
 	case view.AggTypeDistribution:
 		valueType = metricpb.MetricDescriptor_DISTRIBUTION
+	case view.AggTypeLastValue:
+		switch m.(type) {
+		case *stats.Int64Measure:
+			valueType = metricpb.MetricDescriptor_INT64
+		case *stats.Float64Measure:
+			valueType = metricpb.MetricDescriptor_DOUBLE
+		}
 	default:
 		return fmt.Errorf("unsupported aggregation type: %s", agg.Type.String())
 	}
 
-	metricKind = metricpb.MetricDescriptor_CUMULATIVE
+	metricKind := metricpb.MetricDescriptor_CUMULATIVE
 	displayNamePrefix := defaultDisplayNamePrefix
 	if e.o.MetricPrefix != "" {
 		displayNamePrefix = e.o.MetricPrefix
 	}
 
-	md, err = createMetricDescriptor(ctx, e.c, &monitoringpb.CreateMetricDescriptorRequest{
-		Name: monitoring.MetricProjectPath(e.o.ProjectID),
+	md, err := createMetricDescriptor(ctx, e.c, &monitoringpb.CreateMetricDescriptorRequest{
+		Name: fmt.Sprintf("projects/%s", e.o.ProjectID),
 		MetricDescriptor: &metricpb.MetricDescriptor{
+			Name:        fmt.Sprintf("projects/%s/metricDescriptors/%s", e.o.ProjectID, metricType),
 			DisplayName: path.Join(displayNamePrefix, viewName),
-			Description: m.Description(),
-			Unit:        m.Unit(),
-			Type:        namespacedViewName(viewName, false),
+			Description: vd.View.Description,
+			Unit:        unit,
+			Type:        metricType,
 			MetricKind:  metricKind,
 			ValueType:   valueType,
 			Labels:      newLabelDescriptors(vd.View.TagKeys),
@@ -323,28 +311,19 @@ func newTypedValue(vd *view.View, r *view.Row) *monitoringpb.TypedValue {
 	switch v := r.Data.(type) {
 	case *view.CountData:
 		return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_Int64Value{
-			Int64Value: int64(*v),
+			Int64Value: v.Value,
 		}}
 	case *view.SumData:
-		return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DoubleValue{
-			DoubleValue: float64(*v),
-		}}
-	case *view.MeanData:
-		return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DistributionValue{
-			DistributionValue: &distributionpb.Distribution{
-				Count: int64(v.Count),
-				Mean:  v.Mean,
-				SumOfSquaredDeviation: 0,
-				BucketOptions: &distributionpb.Distribution_BucketOptions{
-					Options: &distributionpb.Distribution_BucketOptions_ExplicitBuckets{
-						ExplicitBuckets: &distributionpb.Distribution_BucketOptions_Explicit{
-							Bounds: []float64{0},
-						},
-					},
-				},
-				BucketCounts: []int64{0, int64(v.Count)},
-			},
-		}}
+		switch vd.Measure.(type) {
+		case *stats.Int64Measure:
+			return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_Int64Value{
+				Int64Value: int64(v.Value),
+			}}
+		case *stats.Float64Measure:
+			return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DoubleValue{
+				DoubleValue: v.Value,
+			}}
+		}
 	case *view.DistributionData:
 		return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DistributionValue{
 			DistributionValue: &distributionpb.Distribution{
@@ -366,16 +345,23 @@ func newTypedValue(vd *view.View, r *view.Row) *monitoringpb.TypedValue {
 				BucketCounts: v.CountPerBucket,
 			},
 		}}
+	case *view.LastValueData:
+		switch vd.Measure.(type) {
+		case *stats.Int64Measure:
+			return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_Int64Value{
+				Int64Value: int64(v.Value),
+			}}
+		case *stats.Float64Measure:
+			return &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DoubleValue{
+				DoubleValue: v.Value,
+			}}
+		}
 	}
 	return nil
 }
 
-func namespacedViewName(v string, escaped bool) string {
-	p := path.Join("opencensus", v)
-	if escaped {
-		p = url.PathEscape(p)
-	}
-	return path.Join("custom.googleapis.com", p)
+func namespacedViewName(v string) string {
+	return path.Join("custom.googleapis.com", "opencensus", v)
 }
 
 func newLabels(tags []tag.Tag, taskValue string) map[string]string {
@@ -404,15 +390,21 @@ func newLabelDescriptors(keys []tag.Key) []*labelpb.LabelDescriptor {
 	return labelDescriptors
 }
 
-func equalAggTagKeys(md *metricpb.MetricDescriptor, agg *view.Aggregation, keys []tag.Key) error {
+func equalMeasureAggTagKeys(md *metricpb.MetricDescriptor, m stats.Measure, agg *view.Aggregation, keys []tag.Key) error {
 	var aggTypeMatch bool
 	switch md.ValueType {
 	case metricpb.MetricDescriptor_INT64:
-		aggTypeMatch = agg.Type == view.AggTypeCount
+		if _, ok := m.(*stats.Int64Measure); !(ok || agg.Type == view.AggTypeCount) {
+			return fmt.Errorf("stackdriver metric descriptor was not created as int64")
+		}
+		aggTypeMatch = agg.Type == view.AggTypeCount || agg.Type == view.AggTypeSum || agg.Type == view.AggTypeLastValue
 	case metricpb.MetricDescriptor_DOUBLE:
-		aggTypeMatch = agg.Type == view.AggTypeSum
+		if _, ok := m.(*stats.Float64Measure); !ok {
+			return fmt.Errorf("stackdriver metric descriptor was not created as double")
+		}
+		aggTypeMatch = agg.Type == view.AggTypeSum || agg.Type == view.AggTypeLastValue
 	case metricpb.MetricDescriptor_DISTRIBUTION:
-		aggTypeMatch = agg.Type == view.AggTypeMean || agg.Type == view.AggTypeDistribution
+		aggTypeMatch = agg.Type == view.AggTypeDistribution
 	}
 
 	if !aggTypeMatch {

vendor/go.opencensus.io/exporter/stackdriver/stats_test.go

@@ -26,15 +26,12 @@ import (
 	"go.opencensus.io/stats/view"
 	"go.opencensus.io/tag"
 	"google.golang.org/api/option"
-	distributionpb "google.golang.org/genproto/googleapis/api/distribution"
 	"google.golang.org/genproto/googleapis/api/label"
 	"google.golang.org/genproto/googleapis/api/metric"
 	metricpb "google.golang.org/genproto/googleapis/api/metric"
 	monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres"
 	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 )
 
 var authOptions = []option.ClientOption{option.WithGRPCConn(&grpc.ClientConn{})}
@@ -42,7 +39,7 @@ var authOptions = []option.ClientOption{option.WithGRPCConn(&grpc.ClientConn{})}
 func TestRejectBlankProjectID(t *testing.T) {
 	ids := []string{"", "     ", " "}
 	for _, projectID := range ids {
-		opts := Options{ProjectID: projectID, ClientOptions: authOptions}
+		opts := Options{ProjectID: projectID, MonitoringClientOptions: authOptions}
 		exp, err := newStatsExporter(opts)
 		if err == nil || exp != nil {
 			t.Errorf("%q ProjectID must be rejected: NewExporter() = %v err = %q", projectID, exp, err)
@@ -55,7 +52,7 @@ func TestRejectBlankProjectID(t *testing.T) {
 func TestNewExporterSingletonPerProcess(t *testing.T) {
 	ids := []string{"open-census.io", "x", "fakeProjectID"}
 	for _, projectID := range ids {
-		opts := Options{ProjectID: projectID, ClientOptions: authOptions}
+		opts := Options{ProjectID: projectID, MonitoringClientOptions: authOptions}
 		exp, err := newStatsExporter(opts)
 		if err != nil {
 			t.Errorf("NewExporter() projectID = %q err = %q", projectID, err)
@@ -73,10 +70,7 @@ func TestNewExporterSingletonPerProcess(t *testing.T) {
 }
 
 func TestExporter_makeReq(t *testing.T) {
-	m, err := stats.Float64("test-measure", "measure desc", "unit")
-	if err != nil {
-		t.Fatal(err)
-	}
+	m := stats.Float64("test-measure", "measure desc", "unit")
 
 	key, err := tag.NewKey("test_key")
 	if err != nil {
@@ -99,18 +93,12 @@ func TestExporter_makeReq(t *testing.T) {
 
 	start := time.Now()
 	end := start.Add(time.Minute)
-	count1 := view.CountData(10)
-	count2 := view.CountData(16)
-	sum1 := view.SumData(5.5)
-	sum2 := view.SumData(-11.1)
-	mean1 := view.MeanData{
-		Mean:  3.3,
-		Count: 7,
-	}
-	mean2 := view.MeanData{
-		Mean:  -7.7,
-		Count: 5,
-	}
+	count1 := &view.CountData{Value: 10}
+	count2 := &view.CountData{Value: 16}
+	sum1 := &view.SumData{Value: 5.5}
+	sum2 := &view.SumData{Value: -11.1}
+	last1 := view.LastValueData{Value: 100}
+	last2 := view.LastValueData{Value: 200}
 	taskValue := getTaskValue()
 
 	tests := []struct {
@@ -122,7 +110,7 @@ func TestExporter_makeReq(t *testing.T) {
 		{
 			name:   "count agg + timeline",
 			projID: "proj-id",
-			vd:     newTestViewData(v, start, end, &count1, &count2),
+			vd:     newTestViewData(v, start, end, count1, count2),
 			want: []*monitoringpb.CreateTimeSeriesRequest{{
 				Name: monitoring.MetricProjectPath("proj-id"),
 				TimeSeries: []*monitoringpb.TimeSeries{
@@ -190,7 +178,7 @@ func TestExporter_makeReq(t *testing.T) {
 		{
 			name:   "sum agg + timeline",
 			projID: "proj-id",
-			vd:     newTestViewData(v, start, end, &sum1, &sum2),
+			vd:     newTestViewData(v, start, end, sum1, sum2),
 			want: []*monitoringpb.CreateTimeSeriesRequest{{
 				Name: monitoring.MetricProjectPath("proj-id"),
 				TimeSeries: []*monitoringpb.TimeSeries{
@@ -256,9 +244,9 @@ func TestExporter_makeReq(t *testing.T) {
 			}},
 		},
 		{
-			name:   "mean agg + timeline",
+			name:   "last value agg",
 			projID: "proj-id",
-			vd:     newTestViewData(v, start, end, &mean1, &mean2),
+			vd:     newTestViewData(v, start, end, &last1, &last2),
 			want: []*monitoringpb.CreateTimeSeriesRequest{{
 				Name: monitoring.MetricProjectPath("proj-id"),
 				TimeSeries: []*monitoringpb.TimeSeries{
@@ -285,20 +273,8 @@ func TestExporter_makeReq(t *testing.T) {
 										Nanos:   int32(end.Nanosecond()),
 									},
 								},
-								Value: &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DistributionValue{
-									DistributionValue: &distributionpb.Distribution{
-										Count: 7,
-										Mean:  3.3,
-										SumOfSquaredDeviation: 0,
-										BucketOptions: &distributionpb.Distribution_BucketOptions{
-											Options: &distributionpb.Distribution_BucketOptions_ExplicitBuckets{
-												ExplicitBuckets: &distributionpb.Distribution_BucketOptions_Explicit{
-													Bounds: []float64{0},
-												},
-											},
-										},
-										BucketCounts: []int64{0, 7},
-									},
+								Value: &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DoubleValue{
+									DoubleValue: 100,
 								}},
 							},
 						},
@@ -326,20 +302,8 @@ func TestExporter_makeReq(t *testing.T) {
 										Nanos:   int32(end.Nanosecond()),
 									},
 								},
-								Value: &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DistributionValue{
-									DistributionValue: &distributionpb.Distribution{
-										Count: 5,
-										Mean:  -7.7,
-										SumOfSquaredDeviation: 0,
-										BucketOptions: &distributionpb.Distribution_BucketOptions{
-											Options: &distributionpb.Distribution_BucketOptions_ExplicitBuckets{
-												ExplicitBuckets: &distributionpb.Distribution_BucketOptions_Explicit{
-													Bounds: []float64{0},
-												},
-											},
-										},
-										BucketCounts: []int64{0, 5},
-									},
+								Value: &monitoringpb.TypedValue{Value: &monitoringpb.TypedValue_DoubleValue{
+									DoubleValue: 200,
 								}},
 							},
 						},
@@ -378,10 +342,7 @@ func TestExporter_makeReq(t *testing.T) {
 }
 
 func TestExporter_makeReq_batching(t *testing.T) {
-	m, err := stats.Float64("test-measure/makeReq_batching", "measure desc", "unit")
-	if err != nil {
-		t.Fatal(err)
-	}
+	m := stats.Float64("test-measure/makeReq_batching", "measure desc", "unit")
 
 	key, err := tag.NewKey("test_key")
 	if err != nil {
@@ -426,13 +387,13 @@ func TestExporter_makeReq_batching(t *testing.T) {
 		},
 	}
 
-	count1 := view.CountData(10)
-	count2 := view.CountData(16)
+	count1 := &view.CountData{Value: 10}
+	count2 := &view.CountData{Value: 16}
 
 	for _, tt := range tests {
 		var vds []*view.Data
 		for i := 0; i < tt.iter; i++ {
-			vds = append(vds, newTestViewData(v, time.Now(), time.Now(), &count1, &count2))
+			vds = append(vds, newTestViewData(v, time.Now(), time.Now(), count1, count2))
 		}
 
 		e := &statsExporter{}
@@ -457,58 +418,97 @@ func TestEqualAggWindowTagKeys(t *testing.T) {
 	tests := []struct {
 		name    string
 		md      *metricpb.MetricDescriptor
+		m       stats.Measure
 		agg     *view.Aggregation
 		keys    []tag.Key
 		wantErr bool
 	}{
 		{
-			name: "count agg",
+			name: "count agg with in64 measure",
 			md: &metricpb.MetricDescriptor{
 				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
 				ValueType:  metricpb.MetricDescriptor_INT64,
 				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
 			},
+			m:       stats.Int64("name", "", ""),
 			agg:     view.Count(),
 			wantErr: false,
 		},
 		{
-			name: "sum agg",
+			name: "count agg with double measure",
+			md: &metricpb.MetricDescriptor{
+				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
+				ValueType:  metricpb.MetricDescriptor_INT64,
+				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
+			},
+			m:       stats.Float64("name", "", ""),
+			agg:     view.Count(),
+			wantErr: false,
+		},
+		{
+			name: "sum agg double",
 			md: &metricpb.MetricDescriptor{
 				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
 				ValueType:  metricpb.MetricDescriptor_DOUBLE,
 				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
 			},
+			m:       stats.Float64("name", "", ""),
 			agg:     view.Sum(),
 			wantErr: false,
 		},
 		{
-			name: "mean agg",
+			name: "sum agg int64",
 			md: &metricpb.MetricDescriptor{
 				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
-				ValueType:  metricpb.MetricDescriptor_DISTRIBUTION,
+				ValueType:  metricpb.MetricDescriptor_INT64,
 				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
 			},
-			agg:     view.Mean(),
+			m:       stats.Int64("name", "", ""),
+			agg:     view.Sum(),
 			wantErr: false,
 		},
 		{
-			name: "distribution agg - mismatch",
-			md: &metricpb.MetricDescriptor{
-				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
-				ValueType:  metricpb.MetricDescriptor_DISTRIBUTION,
-				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
-			},
-			agg:     view.Count(),
-			wantErr: true,
-		},
-		{
-			name: "mean agg - mismatch",
+			name: "last value agg double",
 			md: &metricpb.MetricDescriptor{
 				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
 				ValueType:  metricpb.MetricDescriptor_DOUBLE,
 				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
 			},
-			agg:     view.Mean(),
+			m:       stats.Float64("name", "", ""),
+			agg:     view.LastValue(),
+			wantErr: false,
+		},
+		{
+			name: "last value agg int64",
+			md: &metricpb.MetricDescriptor{
+				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
+				ValueType:  metricpb.MetricDescriptor_INT64,
+				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
+			},
+			m:       stats.Int64("name", "", ""),
+			agg:     view.LastValue(),
+			wantErr: false,
+		},
+		{
+			name: "distribution - mismatch",
+			md: &metricpb.MetricDescriptor{
+				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
+				ValueType:  metricpb.MetricDescriptor_DISTRIBUTION,
+				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
+			},
+			m:       stats.Int64("name", "", ""),
+			agg:     view.Count(),
+			wantErr: true,
+		},
+		{
+			name: "last value - measure mismatch",
+			md: &metricpb.MetricDescriptor{
+				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
+				ValueType:  metricpb.MetricDescriptor_INT64,
+				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
+			},
+			m:       stats.Float64("name", "", ""),
+			agg:     view.LastValue(),
 			wantErr: true,
 		},
 		{
@@ -522,6 +522,7 @@ func TestEqualAggWindowTagKeys(t *testing.T) {
 					{Key: opencensusTaskKey},
 				},
 			},
+			m:       stats.Int64("name", "", ""),
 			agg:     view.Distribution(),
 			keys:    []tag.Key{key1, key2},
 			wantErr: false,
@@ -532,6 +533,7 @@ func TestEqualAggWindowTagKeys(t *testing.T) {
 				MetricKind: metricpb.MetricDescriptor_CUMULATIVE,
 				ValueType:  metricpb.MetricDescriptor_DISTRIBUTION,
 			},
+			m:       stats.Int64("name", "", ""),
 			agg:     view.Distribution(),
 			keys:    []tag.Key{key1, key2},
 			wantErr: true,
@@ -543,13 +545,14 @@ func TestEqualAggWindowTagKeys(t *testing.T) {
 				ValueType:  metricpb.MetricDescriptor_INT64,
 				Labels:     []*label.LabelDescriptor{{Key: opencensusTaskKey}},
 			},
+			m:       stats.Int64("name", "", ""),
 			agg:     view.Count(),
 			wantErr: false,
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			err := equalAggTagKeys(tt.md, tt.agg, tt.keys)
+			err := equalMeasureAggTagKeys(tt.md, tt.m, tt.agg, tt.keys)
 			if err != nil && !tt.wantErr {
 				t.Errorf("equalAggTagKeys() = %q; want no error", err)
 			}
@@ -562,49 +565,62 @@ func TestEqualAggWindowTagKeys(t *testing.T) {
 }
 
 func TestExporter_createMeasure(t *testing.T) {
-	oldGetMetricDescriptor := getMetricDescriptor
 	oldCreateMetricDescriptor := createMetricDescriptor
 
 	defer func() {
-		getMetricDescriptor = oldGetMetricDescriptor
 		createMetricDescriptor = oldCreateMetricDescriptor
 	}()
 
 	key, _ := tag.NewKey("test-key-one")
-	m, err := stats.Float64("test-measure/TestExporter_createMeasure", "measure desc", "unit")
-	if err != nil {
-		t.Fatal(err)
-	}
+	m := stats.Float64("test-measure/TestExporter_createMeasure", "measure desc", stats.UnitMilliseconds)
 
 	v := &view.View{
-		Name:        "testview",
-		Description: "desc",
+		Name:        "test_view_sum",
+		Description: "view_description",
 		TagKeys:     []tag.Key{key},
 		Measure:     m,
-		Aggregation: view.Count(),
+		Aggregation: view.Sum(),
 	}
 
-	data := view.CountData(0)
-	vd := newTestViewData(v, time.Now(), time.Now(), &data, &data)
+	data := &view.CountData{Value: 0}
+	vd := newTestViewData(v, time.Now(), time.Now(), data, data)
 
 	e := &statsExporter{
 		createdViews: make(map[string]*metricpb.MetricDescriptor),
+		o:            Options{ProjectID: "test_project"},
 	}
 
-	var getCalls, createCalls int
-	getMetricDescriptor = func(ctx context.Context, c *monitoring.MetricClient, mdr *monitoringpb.GetMetricDescriptorRequest) (*metric.MetricDescriptor, error) {
-		getCalls++
-		return nil, status.Error(codes.NotFound, "")
-	}
+	var createCalls int
 	createMetricDescriptor = func(ctx context.Context, c *monitoring.MetricClient, mdr *monitoringpb.CreateMetricDescriptorRequest) (*metric.MetricDescriptor, error) {
 		createCalls++
+		if got, want := mdr.MetricDescriptor.Name, "projects/test_project/metricDescriptors/custom.googleapis.com/opencensus/test_view_sum"; got != want {
+			t.Errorf("MetricDescriptor.Name = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.Type, "custom.googleapis.com/opencensus/test_view_sum"; got != want {
+			t.Errorf("MetricDescriptor.Type = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.ValueType, metricpb.MetricDescriptor_DOUBLE; got != want {
+			t.Errorf("MetricDescriptor.ValueType = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.MetricKind, metricpb.MetricDescriptor_CUMULATIVE; got != want {
+			t.Errorf("MetricDescriptor.MetricKind = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.Description, "view_description"; got != want {
+			t.Errorf("MetricDescriptor.Description = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.DisplayName, "OpenCensus/test_view_sum"; got != want {
+			t.Errorf("MetricDescriptor.DisplayName = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.Unit, stats.UnitMilliseconds; got != want {
+			t.Errorf("MetricDescriptor.Unit = %q; want %q", got, want)
+		}
 		return &metric.MetricDescriptor{
-			DisplayName: "display",
-			Description: "desc",
-			Unit:        "unit",
-			Type:        "hello",
+			DisplayName: "OpenCensus/test_view_sum",
+			Description: "view_description",
+			Unit:        stats.UnitMilliseconds,
+			Type:        "custom.googleapis.com/opencensus/test_view_sum",
 			MetricKind:  metricpb.MetricDescriptor_CUMULATIVE,
-			ValueType:   metricpb.MetricDescriptor_INT64,
+			ValueType:   metricpb.MetricDescriptor_DOUBLE,
 			Labels:      newLabelDescriptors(vd.View.TagKeys),
 		}, nil
 	}
@@ -616,9 +632,6 @@ func TestExporter_createMeasure(t *testing.T) {
 	if err := e.createMeasure(ctx, vd); err != nil {
 		t.Errorf("Exporter.createMeasure() error = %v", err)
 	}
-	if count := getCalls; count != 1 {
-		t.Errorf("getMetricDescriptor needs to be called for once; called %v times", count)
-	}
 	if count := createCalls; count != 1 {
 		t.Errorf("createMetricDescriptor needs to be called for once; called %v times", count)
 	}
@@ -627,12 +640,73 @@ func TestExporter_createMeasure(t *testing.T) {
 	}
 }
 
-func TestExporter_makeReq_withCustomMonitoredResource(t *testing.T) {
-	m, err := stats.Float64("test-measure/TestExporter_makeReq_withCustomMonitoredResource", "measure desc", "unit")
-	if err != nil {
-		t.Fatal(err)
+func TestExporter_createMeasure_CountAggregation(t *testing.T) {
+	oldCreateMetricDescriptor := createMetricDescriptor
+
+	defer func() {
+		createMetricDescriptor = oldCreateMetricDescriptor
+	}()
+
+	key, _ := tag.NewKey("test-key-one")
+	m := stats.Float64("test-measure/TestExporter_createMeasure", "measure desc", stats.UnitMilliseconds)
+
+	v := &view.View{
+		Name:        "test_view_count",
+		Description: "view_description",
+		TagKeys:     []tag.Key{key},
+		Measure:     m,
+		Aggregation: view.Count(),
 	}
 
+	data := &view.CountData{Value: 0}
+	vd := newTestViewData(v, time.Now(), time.Now(), data, data)
+
+	e := &statsExporter{
+		createdViews: make(map[string]*metricpb.MetricDescriptor),
+		o:            Options{ProjectID: "test_project"},
+	}
+
+	createMetricDescriptor = func(ctx context.Context, c *monitoring.MetricClient, mdr *monitoringpb.CreateMetricDescriptorRequest) (*metric.MetricDescriptor, error) {
+		if got, want := mdr.MetricDescriptor.Name, "projects/test_project/metricDescriptors/custom.googleapis.com/opencensus/test_view_count"; got != want {
+			t.Errorf("MetricDescriptor.Name = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.Type, "custom.googleapis.com/opencensus/test_view_count"; got != want {
+			t.Errorf("MetricDescriptor.Type = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.ValueType, metricpb.MetricDescriptor_INT64; got != want {
+			t.Errorf("MetricDescriptor.ValueType = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.MetricKind, metricpb.MetricDescriptor_CUMULATIVE; got != want {
+			t.Errorf("MetricDescriptor.MetricKind = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.Description, "view_description"; got != want {
+			t.Errorf("MetricDescriptor.Description = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.DisplayName, "OpenCensus/test_view_count"; got != want {
+			t.Errorf("MetricDescriptor.DisplayName = %q; want %q", got, want)
+		}
+		if got, want := mdr.MetricDescriptor.Unit, stats.UnitDimensionless; got != want {
+			t.Errorf("MetricDescriptor.Unit = %q; want %q", got, want)
+		}
+		return &metric.MetricDescriptor{
+			DisplayName: "OpenCensus/test_view_sum",
+			Description: "view_description",
+			Unit:        stats.UnitDimensionless,
+			Type:        "custom.googleapis.com/opencensus/test_view_count",
+			MetricKind:  metricpb.MetricDescriptor_CUMULATIVE,
+			ValueType:   metricpb.MetricDescriptor_INT64,
+			Labels:      newLabelDescriptors(vd.View.TagKeys),
+		}, nil
+	}
+	ctx := context.Background()
+	if err := e.createMeasure(ctx, vd); err != nil {
+		t.Errorf("Exporter.createMeasure() error = %v", err)
+	}
+}
+
+func TestExporter_makeReq_withCustomMonitoredResource(t *testing.T) {
+	m := stats.Float64("test-measure/TestExporter_makeReq_withCustomMonitoredResource", "measure desc", "unit")
+
 	key, err := tag.NewKey("test_key")
 	if err != nil {
 		t.Fatal(err)
@@ -645,15 +719,15 @@ func TestExporter_makeReq_withCustomMonitoredResource(t *testing.T) {
 		Measure:     m,
 		Aggregation: view.Count(),
 	}
-	if err := view.Subscribe(v); err != nil {
+	if err := view.Register(v); err != nil {
 		t.Fatal(err)
 	}
-	defer view.Unsubscribe(v)
+	defer view.Unregister(v)
 
 	start := time.Now()
 	end := start.Add(time.Minute)
-	count1 := view.CountData(10)
-	count2 := view.CountData(16)
+	count1 := &view.CountData{Value: 10}
+	count2 := &view.CountData{Value: 16}
 	taskValue := getTaskValue()
 
 	resource := &monitoredrespb.MonitoredResource{
@@ -670,7 +744,7 @@ func TestExporter_makeReq_withCustomMonitoredResource(t *testing.T) {
 		{
 			name:   "count agg timeline",
 			projID: "proj-id",
-			vd:     newTestViewData(v, start, end, &count1, &count2),
+			vd:     newTestViewData(v, start, end, count1, count2),
 			want: []*monitoringpb.CreateTimeSeriesRequest{{
 				Name: monitoring.MetricProjectPath("proj-id"),
 				TimeSeries: []*monitoringpb.TimeSeries{

vendor/go.opencensus.io/exporter/stackdriver/trace.go

@@ -31,6 +31,7 @@ import (
 // Stackdriver.
 //
 type traceExporter struct {
+	o         Options
 	projectID string
 	bundler   *bundler.Bundler
 	// uploadFn defaults to uploadSpans; it can be replaced for tests.
@@ -42,7 +43,7 @@ type traceExporter struct {
 var _ trace.Exporter = (*traceExporter)(nil)
 
 func newTraceExporter(o Options) (*traceExporter, error) {
-	client, err := tracingclient.NewClient(context.Background(), o.ClientOptions...)
+	client, err := tracingclient.NewClient(context.Background(), o.TraceClientOptions...)
 	if err != nil {
 		return nil, fmt.Errorf("stackdriver: couldn't initialize trace client: %v", err)
 	}
@@ -53,6 +54,7 @@ func newTraceExporterWithClient(o Options, c *tracingclient.Client) *traceExport
 	e := &traceExporter{
 		projectID: o.ProjectID,
 		client:    c,
+		o:         o,
 	}
 	bundler := bundler.NewBundler((*trace.SpanData)(nil), func(bundle interface{}) {
 		e.uploadFn(bundle.([]*trace.SpanData))
@@ -93,7 +95,7 @@ func (e *traceExporter) ExportSpan(s *trace.SpanData) {
 	case bundler.ErrOverflow:
 		e.overflowLogger.log()
 	default:
-		log.Println("OpenCensus Stackdriver exporter: failed to upload span:", err)
+		e.o.handleError(err)
 	}
 }
 
@@ -115,16 +117,18 @@ func (e *traceExporter) uploadSpans(spans []*trace.SpanData) {
 		req.Spans = append(req.Spans, protoFromSpanData(span, e.projectID))
 	}
 	// Create a never-sampled span to prevent traces associated with exporter.
-	span := trace.NewSpan("go.opencensus.io/exporter/stackdriver.uploadSpans", nil, trace.StartOptions{Sampler: trace.NeverSample()})
+	ctx, span := trace.StartSpan( // TODO: add timeouts
+		context.Background(),
+		"go.opencensus.io/exporter/stackdriver.uploadSpans",
+		trace.WithSampler(trace.NeverSample()),
+	)
 	defer span.End()
 	span.AddAttributes(trace.Int64Attribute("num_spans", int64(len(spans))))
 
-	ctx := trace.WithSpan(context.Background(), span) // TODO: add timeouts
 	err := e.client.BatchWriteSpans(ctx, &req)
 	if err != nil {
-		span.SetStatus(trace.Status{Code: 2, Message: err.Error()})
-		// TODO: Allow configuring a logger for exporters.
-		log.Printf("OpenCensus Stackdriver exporter: failed to upload %d spans: %v", len(spans), err)
+		span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
+		e.o.handleError(err)
 	}
 }
 

vendor/go.opencensus.io/exporter/stackdriver/trace_proto.go

@@ -15,7 +15,6 @@
 package stackdriver
 
 import (
-	"fmt"
 	"math"
 	"time"
 	"unicode/utf8"
@@ -144,7 +143,7 @@ func protoFromSpanData(s *trace.SpanData, projectID string) *tracepb.Span {
 		sp.Links.Link = make([]*tracepb.Span_Link, 0, len(s.Links))
 		for _, l := range s.Links {
 			link := &tracepb.Span_Link{
-				TraceId: fmt.Sprintf("projects/%s/traces/%s", projectID, l.TraceID),
+				TraceId: l.TraceID.String(),
 				SpanId:  l.SpanID.String(),
 				Type:    tracepb.Span_Link_Type(l.Type),
 			}
@@ -152,7 +151,6 @@ func protoFromSpanData(s *trace.SpanData, projectID string) *tracepb.Span {
 			sp.Links.Link = append(sp.Links.Link, link)
 		}
 	}
-
 	return sp
 }
 

vendor/go.opencensus.io/exporter/stackdriver/trace_proto_test.go

@@ -57,19 +57,21 @@ func (t *testExporter) ExportSpan(s *trace.SpanData) {
 }
 
 func TestExportTrace(t *testing.T) {
+	ctx := context.Background()
+
 	var te testExporter
 	trace.RegisterExporter(&te)
 	defer trace.UnregisterExporter(&te)
 
-	span0 := trace.NewSpanWithRemoteParent(
+	ctx, span0 := trace.StartSpanWithRemoteParent(
+		ctx,
 		"span0",
 		trace.SpanContext{
 			TraceID:      traceID,
 			SpanID:       spanID,
 			TraceOptions: 1,
 		},
-		trace.StartOptions{})
-	ctx := trace.WithSpan(context.Background(), span0)
+	)
 	{
 		ctx1, span1 := trace.StartSpan(ctx, "span1")
 		{
@@ -289,7 +291,7 @@ func TestExportTrace(t *testing.T) {
 			Links: &tracepb.Span_Links{
 				Link: []*tracepb.Span_Link{
 					{
-						TraceId: "projects/testproject/traces/01020000000000000000000000000000",
+						TraceId: "01020000000000000000000000000000",
 						SpanId:  "0300000000000000",
 						Type:    tracepb.Span_Link_PARENT_LINKED_SPAN,
 						Attributes: &tracepb.Span_Attributes{

vendor/go.opencensus.io/exporter/stackdriver/trace_test.go

@@ -35,9 +35,8 @@ func TestBundling(t *testing.T) {
 	}
 	trace.RegisterExporter(exporter)
 
-	trace.SetDefaultSampler(trace.AlwaysSample())
 	for i := 0; i < 35; i++ {
-		_, span := trace.StartSpan(context.Background(), "span")
+		_, span := trace.StartSpan(context.Background(), "span", trace.WithSampler(trace.AlwaysSample()))
 		span.End()
 	}
 

vendor/go.opencensus.io/exporter/zipkin/example/main.go

@@ -42,7 +42,7 @@ func main() {
 	trace.RegisterExporter(exporter)
 
 	// For example purposes, sample every trace.
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 	ctx := context.Background()
 	foo(ctx)

vendor/go.opencensus.io/internal/internal.go

@@ -12,13 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package internal
+package internal // import "go.opencensus.io/internal"
 
 import "time"
 
 // UserAgent is the user agent to be added to the outgoing
 // requests from the exporters.
-const UserAgent = "opencensus-go-v0.4.0"
+const UserAgent = "opencensus-go [0.8.0]"
 
 // MonotonicEndTime returns the end time at present
 // but offset from start, monotonically.

vendor/go.opencensus.io/internal/readme/README.md

@@ -2,5 +2,5 @@ Use the following commands to regenerate the README.
 
 ```bash
 $ go get github.com/rakyll/embedmd
-$ embedmd source.md > ../../README.md
+$ embedmd -w ../../README.md
 ```

vendor/go.opencensus.io/internal/readme/source.md

@@ -1,141 +0,0 @@
-# OpenCensus Libraries for Go
-
-[![Build Status][travis-image]][travis-url]
-[![Windows Build Status][appveyor-image]][appveyor-url]
-[![GoDoc][godoc-image]][godoc-url]
-[![Gitter chat][gitter-image]][gitter-url]
-
-OpenCensus Go is a Go implementation of OpenCensus, a toolkit for
-collecting application performance and behavior monitoring data.
-Currently it consists of three major components: tags, stats, and tracing.
-
-This project is still at a very early stage of development. The API is changing
-rapidly, vendoring is recommended.
-
-
-## Installation
-
-```
-$ go get -u go.opencensus.io
-```
-
-## Prerequisites
-
-OpenCensus Go libraries require Go 1.8 or later.
-
-## Exporters
-
-OpenCensus can export instrumentation data to various backends. 
-Currently, OpenCensus supports:
-
-* [Prometheus][exporter-prom] for stats
-* [OpenZipkin][exporter-zipkin] for traces
-* Stackdriver [Monitoring][exporter-stackdriver] and [Trace][exporter-stackdriver]
-* [Jaeger][exporter-jaeger] for traces
-* [AWS X-Ray][exporter-xray] for traces
-
-
-## Overview
-
-![OpenCensus Overview](https://i.imgur.com/cf4ElHE.jpg)
-
-In a microservices environment, a user request may go through
-multiple services until there is a response. OpenCensus allows
-you to instrument your services and collect diagnostics data all
-through your services end-to-end.
-
-Start with instrumenting HTTP and gRPC clients and servers,
-then add additional custom instrumentation if needed.
-
-* [HTTP guide](https://github.com/census-instrumentation/opencensus-go/tree/master/examples/http)
-* [gRPC guide](https://github.com/census-instrumentation/opencensus-go/tree/master/examples/grpc)
-
-
-## Tags
-
-Tags represent propagated key-value pairs. They are propagated using context.Context
-in the same process or can be encoded to be transmitted on the wire and decoded back
-to a tag.Map at the destination.
-
-Package tag provides a builder to create tag maps and put it
-into the current context.
-To propagate a tag map to downstream methods and RPCs, New
-will add the produced tag map to the current context.
-If there is already a tag map in the current context, it will be replaced.
-
-[embedmd]:# (tags.go new)
-
-## Stats
-
-OpenCensus is a low-overhead framework even if instrumentation is always enabled.
-In order to be so, it is optimized to make recording of data points fast
-and separate from the data aggregation.
-
-OpenCensus stats collection happens in two stages:
-
-* Definition of measures and recording of data points
-* Definition of views and aggregation of the recorded data
-
-### Recording
-
-Measurements are data points associated with a measure.
-Recording implicitly tags the set of Measurements with the tags from the
-provided context:
-
-[embedmd]:# (stats.go record)
-
-### Views
-
-Views are how Measures are aggregated. You can think of them as queries over the
-set of recorded data points (measurements).
-
-Views have two parts: the tags to group by and the aggregation type used.
-
-Currently four types of aggregations are supported:
-* CountAggregation is used to count the number of times a sample was recorded.
-* DistributionAggregation is used to provide a histogram of the values of the samples.
-* SumAggregation is used to sum up all sample values.
-* MeanAggregation is used to calculate the mean of sample values.
-
-[embedmd]:# (stats.go aggs)
-
-Here we create a view with the DistributionAggregation over our measure.
-
-[embedmd]:# (stats.go view)
-
-Subscribe begins collecting data for the view. Subscribed views' data will be
-exported via the registered exporters.
-
-## Traces
-
-[embedmd]:# (trace.go startend)
-
-## Profiles
-
-OpenCensus tags can be applied as profiler labels
-for users who are on Go 1.9 and above.
-
-[embedmd]:# (tags.go profiler)
-
-A screenshot of the CPU profile from the program above:
-
-![CPU profile](https://i.imgur.com/jBKjlkw.png)
-
-[travis-image]: https://travis-ci.org/census-instrumentation/opencensus-go.svg?branch=master
-[travis-url]: https://travis-ci.org/census-instrumentation/opencensus-go
-[appveyor-image]: https://ci.appveyor.com/api/projects/status/vgtt29ps1783ig38?svg=true
-[appveyor-url]: https://ci.appveyor.com/project/opencensusgoteam/opencensus-go/branch/master
-[godoc-image]: https://godoc.org/go.opencensus.io?status.svg
-[godoc-url]: https://godoc.org/go.opencensus.io
-[gitter-image]: https://badges.gitter.im/census-instrumentation/lobby.svg
-[gitter-url]: https://gitter.im/census-instrumentation/lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
-
-
-[new-ex]: https://godoc.org/go.opencensus.io/tag#example-NewMap
-[new-replace-ex]: https://godoc.org/go.opencensus.io/tag#example-NewMap--Replace
-
-[exporter-prom]: https://godoc.org/go.opencensus.io/exporter/prometheus
-[exporter-stackdriver]: https://godoc.org/go.opencensus.io/exporter/stackdriver
-[exporter-zipkin]: https://godoc.org/go.opencensus.io/exporter/zipkin
-[exporter-jaeger]: https://godoc.org/go.opencensus.io/exporter/jaeger
-[exporter-xray]: https://github.com/census-instrumentation/opencensus-go-exporter-aws

vendor/go.opencensus.io/internal/readme/stats.go

@@ -13,7 +13,7 @@
 // limitations under the License.
 
 // Package readme generates the README.
-package readme
+package readme // import "go.opencensus.io/internal/readme"
 
 import (
 	"context"
@@ -29,27 +29,18 @@ import (
 func statsExamples() {
 	ctx := context.Background()
 
-	videoSize, err := stats.Int64("my.org/video_size", "processed video size", "MB")
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	m := stats.FindMeasure("my.org/video_size")
-	if m == nil {
-		log.Fatalln("measure not found")
-	}
+	videoSize := stats.Int64("my.org/video_size", "processed video size", "MB")
 
 	// START aggs
 	distAgg := view.Distribution(0, 1<<32, 2<<32, 3<<32)
 	countAgg := view.Count()
 	sumAgg := view.Sum()
-	meanAgg := view.Mean()
 	// END aggs
 
-	_, _, _, _ = distAgg, countAgg, sumAgg, meanAgg
+	_, _, _ = distAgg, countAgg, sumAgg
 
 	// START view
-	if err = view.Subscribe(&view.View{
+	if err := view.Register(&view.View{
 		Name:        "my.org/video_size_distribution",
 		Description: "distribution of processed video size over time",
 		Measure:     videoSize,

vendor/go.opencensus.io/internal/tagencoding/tagencoding.go

@@ -15,7 +15,7 @@
 
 // Package tagencoding contains the tag encoding
 // used interally by the stats collector.
-package tagencoding
+package tagencoding // import "go.opencensus.io/internal/tagencoding"
 
 type Values struct {
 	Buffer     []byte

vendor/go.opencensus.io/internal/testpb/test.pb.go

@@ -11,7 +11,7 @@ It has these top-level messages:
 	FooRequest
 	FooResponse
 */
-package testpb
+package testpb // import "go.opencensus.io/internal/testpb"
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"

vendor/go.opencensus.io/plugin/ocgrpc/benchmark_test.go

@@ -0,0 +1,65 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ocgrpc
+
+import (
+	"testing"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+func BenchmarkStatusCodeToString_OK(b *testing.B) {
+	st := status.New(codes.OK, "OK")
+	for i := 0; i < b.N; i++ {
+		s := statusCodeToString(st)
+		_ = s
+	}
+}
+
+func BenchmarkStatusCodeToString_Unauthenticated(b *testing.B) {
+	st := status.New(codes.Unauthenticated, "Unauthenticated")
+	for i := 0; i < b.N; i++ {
+		s := statusCodeToString(st)
+		_ = s
+	}
+}
+
+var codeToStringMap = map[codes.Code]string{
+	codes.OK:                 "OK",
+	codes.Canceled:           "CANCELLED",
+	codes.Unknown:            "UNKNOWN",
+	codes.InvalidArgument:    "INVALID_ARGUMENT",
+	codes.DeadlineExceeded:   "DEADLINE_EXCEEDED",
+	codes.NotFound:           "NOT_FOUND",
+	codes.AlreadyExists:      "ALREADY_EXISTS",
+	codes.PermissionDenied:   "PERMISSION_DENIED",
+	codes.ResourceExhausted:  "RESOURCE_EXHAUSTED",
+	codes.FailedPrecondition: "FAILED_PRECONDITION",
+	codes.Aborted:            "ABORTED",
+	codes.OutOfRange:         "OUT_OF_RANGE",
+	codes.Unimplemented:      "UNIMPLEMENTED",
+	codes.Internal:           "INTERNAL",
+	codes.Unavailable:        "UNAVAILABLE",
+	codes.DataLoss:           "DATA_LOSS",
+	codes.Unauthenticated:    "UNAUTHENTICATED",
+}
+
+func BenchmarkMapAlternativeImpl_OK(b *testing.B) {
+	st := status.New(codes.OK, "OK")
+	for i := 0; i < b.N; i++ {
+		_ = codeToStringMap[st.Code()]
+	}
+}

vendor/go.opencensus.io/plugin/ocgrpc/client.go

@@ -44,7 +44,7 @@ func (c *ClientHandler) TagConn(ctx context.Context, cti *stats.ConnTagInfo) con
 // HandleRPC implements per-RPC tracing and stats instrumentation.
 func (c *ClientHandler) HandleRPC(ctx context.Context, rs stats.RPCStats) {
 	traceHandleRPC(ctx, rs)
-	c.statsHandleRPC(ctx, rs)
+	statsHandleRPC(ctx, rs)
 }
 
 // TagRPC implements per-RPC context management.

vendor/go.opencensus.io/plugin/ocgrpc/client_metrics.go

@@ -23,14 +23,12 @@ import (
 
 // The following variables are measures are recorded by ClientHandler:
 var (
-	ClientErrorCount, _       = stats.Int64("grpc.io/client/error_count", "RPC Errors", stats.UnitNone)
-	ClientRequestBytes, _     = stats.Int64("grpc.io/client/request_bytes", "Request bytes", stats.UnitBytes)
-	ClientResponseBytes, _    = stats.Int64("grpc.io/client/response_bytes", "Response bytes", stats.UnitBytes)
-	ClientStartedCount, _     = stats.Int64("grpc.io/client/started_count", "Number of client RPCs (streams) started", stats.UnitNone)
-	ClientFinishedCount, _    = stats.Int64("grpc.io/client/finished_count", "Number of client RPCs (streams) finished", stats.UnitNone)
-	ClientRequestCount, _     = stats.Int64("grpc.io/client/request_count", "Number of client RPC request messages", stats.UnitNone)
-	ClientResponseCount, _    = stats.Int64("grpc.io/client/response_count", "Number of client RPC response messages", stats.UnitNone)
-	ClientRoundTripLatency, _ = stats.Float64("grpc.io/client/roundtrip_latency", "RPC roundtrip latency in msecs", stats.UnitMilliseconds)
+	ClientSentMessagesPerRPC     = stats.Int64("grpc.io/client/sent_messages_per_rpc", "Number of messages sent in the RPC (always 1 for non-streaming RPCs).", stats.UnitDimensionless)
+	ClientSentBytesPerRPC        = stats.Int64("grpc.io/client/sent_bytes_per_rpc", "Total bytes sent across all request messages per RPC.", stats.UnitBytes)
+	ClientReceivedMessagesPerRPC = stats.Int64("grpc.io/client/received_messages_per_rpc", "Number of response messages received per RPC (always 1 for non-streaming RPCs).", stats.UnitDimensionless)
+	ClientReceivedBytesPerRPC    = stats.Int64("grpc.io/client/received_bytes_per_rpc", "Total bytes received across all response messages per RPC.", stats.UnitBytes)
+	ClientRoundtripLatency       = stats.Float64("grpc.io/client/roundtrip_latency", "Time between first byte of request sent to last byte of response received, or terminal error.", stats.UnitMilliseconds)
+	ClientServerLatency          = stats.Float64("grpc.io/client/server_latency", `Propagated from the server and should have the same value as "grpc.io/server/latency".`, stats.UnitMilliseconds)
 )
 
 // Predefined views may be subscribed to collect data for the above measures.
@@ -38,63 +36,78 @@ var (
 // package. These are declared as a convenience only; none are subscribed by
 // default.
 var (
-	ClientErrorCountView = &view.View{
-		Name:        "grpc.io/client/error_count",
-		Description: "RPC Errors",
-		TagKeys:     []tag.Key{KeyStatus, KeyMethod},
-		Measure:     ClientErrorCount,
-		Aggregation: view.Mean(),
+	ClientSentBytesPerRPCView = &view.View{
+		Measure:     ClientSentBytesPerRPC,
+		Name:        "grpc.io/client/sent_bytes_per_rpc",
+		Description: "Distribution of bytes sent per RPC, by method.",
+		TagKeys:     []tag.Key{KeyClientMethod},
+		Aggregation: DefaultBytesDistribution,
 	}
 
-	ClientRoundTripLatencyView = &view.View{
+	ClientReceivedBytesPerRPCView = &view.View{
+		Measure:     ClientReceivedBytesPerRPC,
+		Name:        "grpc.io/client/received_bytes_per_rpc",
+		Description: "Distribution of bytes received per RPC, by method.",
+		TagKeys:     []tag.Key{KeyClientMethod},
+		Aggregation: DefaultBytesDistribution,
+	}
+
+	ClientRoundtripLatencyView = &view.View{
+		Measure:     ClientRoundtripLatency,
 		Name:        "grpc.io/client/roundtrip_latency",
-		Description: "Latency in msecs",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ClientRoundTripLatency,
+		Description: "Distribution of round-trip latency, by method.",
+		TagKeys:     []tag.Key{KeyClientMethod},
 		Aggregation: DefaultMillisecondsDistribution,
 	}
 
-	ClientRequestBytesView = &view.View{
-		Name:        "grpc.io/client/request_bytes",
-		Description: "Request bytes",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ClientRequestBytes,
-		Aggregation: DefaultBytesDistribution,
+	ClientCompletedRPCsView = &view.View{
+		Measure:     ClientRoundtripLatency,
+		Name:        "grpc.io/client/completed_rpcs",
+		Description: "Count of RPCs by method and status.",
+		TagKeys:     []tag.Key{KeyClientMethod, KeyClientStatus},
+		Aggregation: view.Count(),
 	}
 
-	ClientResponseBytesView = &view.View{
-		Name:        "grpc.io/client/response_bytes",
-		Description: "Response bytes",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ClientResponseBytes,
-		Aggregation: DefaultBytesDistribution,
+	ClientSentMessagesPerRPCView = &view.View{
+		Measure:     ClientSentMessagesPerRPC,
+		Name:        "grpc.io/client/sent_messages_per_rpc",
+		Description: "Distribution of sent messages count per RPC, by method.",
+		TagKeys:     []tag.Key{KeyClientMethod},
+		Aggregation: DefaultMessageCountDistribution,
 	}
 
+	ClientReceivedMessagesPerRPCView = &view.View{
+		Measure:     ClientReceivedMessagesPerRPC,
+		Name:        "grpc.io/client/received_messages_per_rpc",
+		Description: "Distribution of received messages count per RPC, by method.",
+		TagKeys:     []tag.Key{KeyClientMethod},
+		Aggregation: DefaultMessageCountDistribution,
+	}
+
+	ClientServerLatencyView = &view.View{
+		Measure:     ClientServerLatency,
+		Name:        "grpc.io/client/server_latency",
+		Description: "Distribution of server latency as viewed by client, by method.",
+		TagKeys:     []tag.Key{KeyClientMethod},
+		Aggregation: DefaultMillisecondsDistribution,
+	}
+
+	// Deprecated: This view is going to be removed, if you need it please define it
+	// yourself.
 	ClientRequestCountView = &view.View{
-		Name:        "grpc.io/client/request_count",
-		Description: "Count of request messages per client RPC",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ClientRequestCount,
-		Aggregation: DefaultMessageCountDistribution,
-	}
-
-	ClientResponseCountView = &view.View{
-		Name:        "grpc.io/client/response_count",
-		Description: "Count of response messages per client RPC",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ClientResponseCount,
-		Aggregation: DefaultMessageCountDistribution,
+		Name:        "Count of request messages per client RPC",
+		TagKeys:     []tag.Key{KeyClientMethod},
+		Measure:     ClientRoundtripLatency,
+		Aggregation: view.Count(),
 	}
 )
 
 // DefaultClientViews are the default client views provided by this package.
 var DefaultClientViews = []*view.View{
-	ClientErrorCountView,
-	ClientRoundTripLatencyView,
-	ClientRequestBytesView,
-	ClientResponseBytesView,
-	ClientRequestCountView,
-	ClientResponseCountView,
+	ClientSentBytesPerRPCView,
+	ClientReceivedBytesPerRPCView,
+	ClientRoundtripLatencyView,
+	ClientCompletedRPCsView,
 }
 
 // TODO(jbd): Add roundtrip_latency, uncompressed_request_bytes, uncompressed_response_bytes, request_count, response_count.

vendor/go.opencensus.io/plugin/ocgrpc/client_metrics_test.go

@@ -1,71 +0,0 @@
-// Copyright 2017, OpenCensus Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-package ocgrpc
-
-import (
-	"reflect"
-	"runtime"
-	"testing"
-
-	"go.opencensus.io/stats/view"
-)
-
-func TestViewsAggregationsConform(t *testing.T) {
-	// See Issue https://github.com/census-instrumentation/opencensus-go/issues/210.
-	// This test ensures that the types of our Views match up with those
-	// from the Java reference at
-	// https://github.com/census-instrumentation/opencensus-java/blob/2b464864e3dd3f80e8e4c9dc72fccc225444a939/contrib/grpc_metrics/src/main/java/io/opencensus/contrib/grpc/metrics/RpcViewConstants.java#L113-L658
-	// Add any other defined views to be type checked during tests to ensure we don't regress.
-
-	assertTypeOf := func(v *view.View, wantSample *view.Aggregation) {
-		aggregation := v.Aggregation
-		gotValue := reflect.ValueOf(aggregation)
-		wantValue := reflect.ValueOf(wantSample)
-		if gotValue.Type() != wantValue.Type() {
-			_, _, line, _ := runtime.Caller(1)
-			t.Errorf("Item on line: %d got %T want %T", line, aggregation, wantSample)
-		}
-	}
-
-	assertTypeOf(ClientErrorCountView, view.Mean())
-	assertTypeOf(ClientRoundTripLatencyView, view.Distribution())
-	assertTypeOf(ClientRequestBytesView, view.Distribution())
-	assertTypeOf(ClientResponseBytesView, view.Distribution())
-	assertTypeOf(ClientRequestCountView, view.Distribution())
-	assertTypeOf(ClientResponseCountView, view.Distribution())
-}
-
-func TestStrictViewNames(t *testing.T) {
-	alreadySeen := make(map[string]int)
-	assertName := func(v *view.View, want string) {
-		_, _, line, _ := runtime.Caller(1)
-		if prevLine, ok := alreadySeen[v.Name]; ok {
-			t.Errorf("Item's Name on line %d was already used on line %d", line, prevLine)
-			return
-		}
-		if got := v.Name; got != want {
-			t.Errorf("Item on line: %d got %q want %q", line, got, want)
-		}
-		alreadySeen[v.Name] = line
-	}
-
-	assertName(ClientErrorCountView, "grpc.io/client/error_count")
-	assertName(ClientRoundTripLatencyView, "grpc.io/client/roundtrip_latency")
-	assertName(ClientRequestBytesView, "grpc.io/client/request_bytes")
-	assertName(ClientResponseBytesView, "grpc.io/client/response_bytes")
-	assertName(ClientRequestCountView, "grpc.io/client/request_count")
-	assertName(ClientResponseCountView, "grpc.io/client/response_count")
-}

vendor/go.opencensus.io/plugin/ocgrpc/client_spec_test.go

@@ -0,0 +1,152 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package ocgrpc
+
+import (
+	"regexp"
+	"strings"
+	"testing"
+
+	"go.opencensus.io/stats"
+	"go.opencensus.io/stats/view"
+)
+
+var colSep = regexp.MustCompile(`\s*\|\s*`)
+
+func TestSpecClientMeasures(t *testing.T) {
+	spec := `
+| Measure name                             | Unit | Description                                                                                   |
+|------------------------------------------|------|-----------------------------------------------------------------------------------------------|
+| grpc.io/client/sent_messages_per_rpc     | 1    | Number of messages sent in the RPC (always 1 for non-streaming RPCs).                       |
+| grpc.io/client/sent_bytes_per_rpc        | By   | Total bytes sent across all request messages per RPC.                                       |
+| grpc.io/client/received_messages_per_rpc | 1    | Number of response messages received per RPC (always 1 for non-streaming RPCs).           |
+| grpc.io/client/received_bytes_per_rpc    | By   | Total bytes received across all response messages per RPC.                                  |
+| grpc.io/client/roundtrip_latency         | ms   | Time between first byte of request sent to last byte of response received, or terminal error. |
+| grpc.io/client/server_latency            | ms   | Propagated from the server and should have the same value as "grpc.io/server/latency".        |`
+
+	lines := strings.Split(spec, "\n")[3:]
+	type measureDef struct {
+		name string
+		unit string
+		desc string
+	}
+	measureDefs := make([]measureDef, 0, len(lines))
+	for _, line := range lines {
+		cols := colSep.Split(line, -1)[1:]
+		if len(cols) < 3 {
+			t.Fatalf("Invalid config line %#v", cols)
+		}
+		measureDefs = append(measureDefs, measureDef{cols[0], cols[1], cols[2]})
+	}
+
+	gotMeasures := []stats.Measure{
+		ClientSentMessagesPerRPC,
+		ClientSentBytesPerRPC,
+		ClientReceivedMessagesPerRPC,
+		ClientReceivedBytesPerRPC,
+		ClientRoundtripLatency,
+		ClientServerLatency,
+	}
+
+	if got, want := len(gotMeasures), len(measureDefs); got != want {
+		t.Fatalf("len(gotMeasures) = %d; want %d", got, want)
+	}
+
+	for i, m := range gotMeasures {
+		defn := measureDefs[i]
+		if got, want := m.Name(), defn.name; got != want {
+			t.Errorf("Name = %q; want %q", got, want)
+		}
+		if got, want := m.Unit(), defn.unit; got != want {
+			t.Errorf("%q: Unit = %q; want %q", defn.name, got, want)
+		}
+		if got, want := m.Description(), defn.desc; got != want {
+			t.Errorf("%q: Description = %q; want %q", defn.name, got, want)
+		}
+	}
+}
+
+func TestSpecClientViews(t *testing.T) {
+	defaultViewsSpec := `
+| View name                             | Measure suffix         | Aggregation  | Tags                         |
+|---------------------------------------|------------------------|--------------|------------------------------|
+| grpc.io/client/sent_bytes_per_rpc     | sent_bytes_per_rpc     | distribution | client_method                |
+| grpc.io/client/received_bytes_per_rpc | received_bytes_per_rpc | distribution | client_method                |
+| grpc.io/client/roundtrip_latency      | roundtrip_latency      | distribution | client_method                |
+| grpc.io/client/completed_rpcs         | roundtrip_latency      | count        | client_method, client_status |`
+
+	extraViewsSpec := `
+| View name                                | Measure suffix            | Aggregation  | Tags suffix   |
+|------------------------------------------|---------------------------|--------------|---------------|
+| grpc.io/client/sent_messages_per_rpc     | sent_messages_per_rpc     | distribution | client_method |
+| grpc.io/client/received_messages_per_rpc | received_messages_per_rpc | distribution | client_method |
+| grpc.io/client/server_latency            | server_latency            | distribution | client_method |`
+
+	lines := strings.Split(defaultViewsSpec, "\n")[3:]
+	lines = append(lines, strings.Split(extraViewsSpec, "\n")[3:]...)
+	type viewDef struct {
+		name          string
+		measureSuffix string
+		aggregation   string
+		tags          string
+	}
+	viewDefs := make([]viewDef, 0, len(lines))
+	for _, line := range lines {
+		cols := colSep.Split(line, -1)[1:]
+		if len(cols) < 4 {
+			t.Fatalf("Invalid config line %#v", cols)
+		}
+		viewDefs = append(viewDefs, viewDef{cols[0], cols[1], cols[2], cols[3]})
+	}
+
+	views := DefaultClientViews
+	views = append(views, ClientSentMessagesPerRPCView, ClientReceivedMessagesPerRPCView, ClientServerLatencyView)
+
+	if got, want := len(views), len(viewDefs); got != want {
+		t.Fatalf("len(gotMeasures) = %d; want %d", got, want)
+	}
+
+	for i, v := range views {
+		defn := viewDefs[i]
+		if got, want := v.Name, defn.name; got != want {
+			t.Errorf("Name = %q; want %q", got, want)
+		}
+		if got, want := v.Measure.Name(), "grpc.io/client/"+defn.measureSuffix; got != want {
+			t.Errorf("%q: Measure.Name = %q; want %q", defn.name, got, want)
+		}
+		switch v.Aggregation.Type {
+		case view.AggTypeDistribution:
+			if got, want := "distribution", defn.aggregation; got != want {
+				t.Errorf("%q: Description = %q; want %q", defn.name, got, want)
+			}
+		case view.AggTypeCount:
+			if got, want := "count", defn.aggregation; got != want {
+				t.Errorf("%q: Description = %q; want %q", defn.name, got, want)
+			}
+		default:
+			t.Errorf("Invalid aggregation type")
+		}
+		wantTags := strings.Split(defn.tags, ", ")
+		if got, want := len(v.TagKeys), len(wantTags); got != want {
+			t.Errorf("len(TagKeys) = %d; want %d", got, want)
+		}
+		for j := range wantTags {
+			if got, want := v.TagKeys[j].Name(), "grpc_"+wantTags[j]; got != want {
+				t.Errorf("TagKeys[%d].Name() = %q; want %q", j, got, want)
+			}
+		}
+	}
+}

vendor/go.opencensus.io/plugin/ocgrpc/client_stats_handler.go

@@ -16,15 +16,12 @@
 package ocgrpc
 
 import (
-	"sync/atomic"
 	"time"
 
-	ocstats "go.opencensus.io/stats"
 	"go.opencensus.io/tag"
 	"golang.org/x/net/context"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/stats"
-	"google.golang.org/grpc/status"
 )
 
 // statsTagRPC gets the tag.Map populated by the application code, serializes
@@ -48,81 +45,5 @@ func (h *ClientHandler) statsTagRPC(ctx context.Context, info *stats.RPCTagInfo)
 		ctx = stats.SetTags(ctx, encoded)
 	}
 
-	// TODO(acetechnologist): should we be recording this later? What is the
-	// point of updating d.reqLen & d.reqCount if we update now?
-	record(ctx, d, "", ClientStartedCount.M(1))
-	return context.WithValue(ctx, grpcClientRPCKey, d)
-}
-
-// statsHandleRPC processes the RPC events.
-func (h *ClientHandler) statsHandleRPC(ctx context.Context, s stats.RPCStats) {
-	switch st := s.(type) {
-	case *stats.Begin, *stats.OutHeader, *stats.InHeader, *stats.InTrailer, *stats.OutTrailer:
-		// do nothing for client
-	case *stats.OutPayload:
-		h.handleRPCOutPayload(ctx, st)
-	case *stats.InPayload:
-		h.handleRPCInPayload(ctx, st)
-	case *stats.End:
-		h.handleRPCEnd(ctx, st)
-	default:
-		grpclog.Infof("unexpected stats: %T", st)
-	}
-}
-
-func (h *ClientHandler) handleRPCOutPayload(ctx context.Context, s *stats.OutPayload) {
-	d, ok := ctx.Value(grpcClientRPCKey).(*rpcData)
-	if !ok {
-		if grpclog.V(2) {
-			grpclog.Infoln("clientHandler.handleRPCOutPayload failed to retrieve *rpcData from context")
-		}
-		return
-	}
-
-	record(ctx, d, "", ClientRequestBytes.M(int64(s.Length)))
-	atomic.AddInt64(&d.reqCount, 1)
-}
-
-func (h *ClientHandler) handleRPCInPayload(ctx context.Context, s *stats.InPayload) {
-	d, ok := ctx.Value(grpcClientRPCKey).(*rpcData)
-	if !ok {
-		if grpclog.V(2) {
-			grpclog.Infoln("failed to retrieve *rpcData from context")
-		}
-		return
-	}
-
-	record(ctx, d, "", ClientResponseBytes.M(int64(s.Length)))
-	atomic.AddInt64(&d.respCount, 1)
-}
-
-func (h *ClientHandler) handleRPCEnd(ctx context.Context, s *stats.End) {
-	d, ok := ctx.Value(grpcClientRPCKey).(*rpcData)
-	if !ok {
-		if grpclog.V(2) {
-			grpclog.Infoln("failed to retrieve *rpcData from context")
-		}
-		return
-	}
-
-	elapsedTime := time.Since(d.startTime)
-	reqCount := atomic.LoadInt64(&d.reqCount)
-	respCount := atomic.LoadInt64(&d.respCount)
-
-	m := []ocstats.Measurement{
-		ClientRequestCount.M(reqCount),
-		ClientResponseCount.M(respCount),
-		ClientFinishedCount.M(1),
-		ClientRoundTripLatency.M(float64(elapsedTime) / float64(time.Millisecond)),
-	}
-
-	var st string
-	if s.Error != nil {
-		s, ok := status.FromError(s.Error)
-		if ok {
-			st = s.Code().String()
-		}
-		m = append(m, ClientErrorCount.M(1))
-	}
-	record(ctx, d, st, m...)
+	return context.WithValue(ctx, rpcDataKey, d)
 }

vendor/go.opencensus.io/plugin/ocgrpc/client_stats_handler_test.go

@@ -58,8 +58,8 @@ func TestClientDefaultCollections(t *testing.T) {
 	}
 	tcs := []testCase{
 		{
-			"1",
-			[]*rpc{
+			label: "1",
+			rpcs: []*rpc{
 				{
 					[]tagPair{{k1, "v1"}},
 					&stats.RPCTagInfo{FullMethodName: "/package.service/method"},
@@ -72,46 +72,46 @@ func TestClientDefaultCollections(t *testing.T) {
 					&stats.End{Error: nil},
 				},
 			},
-			[]*wantData{
+			wants: []*wantData{
 				{
-					func() *view.View { return ClientRequestCountView },
+					func() *view.View { return ClientSentMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 1, 1, 1, 0),
 						},
 					},
 				},
 				{
-					func() *view.View { return ClientResponseCountView },
+					func() *view.View { return ClientReceivedMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 1, 1, 1, 0),
 						},
 					},
 				},
 				{
-					func() *view.View { return ClientRequestBytesView },
+					func() *view.View { return ClientSentBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 10, 10, 10, 0),
 						},
 					},
 				},
 				{
-					func() *view.View { return ClientResponseBytesView },
+					func() *view.View { return ClientReceivedBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 10, 10, 10, 0),
 						},
@@ -120,8 +120,8 @@ func TestClientDefaultCollections(t *testing.T) {
 			},
 		},
 		{
-			"2",
-			[]*rpc{
+			label: "2",
+			rpcs: []*rpc{
 				{
 					[]tagPair{{k1, "v1"}},
 					&stats.RPCTagInfo{FullMethodName: "/package.service/method"},
@@ -149,36 +149,24 @@ func TestClientDefaultCollections(t *testing.T) {
 					&stats.End{Error: status.Error(codes.Canceled, "canceled")},
 				},
 			},
-			[]*wantData{
+			wants: []*wantData{
 				{
-					func() *view.View { return ClientErrorCountView },
+					func() *view.View { return ClientSentMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyStatus, Value: "Canceled"},
-								{Key: KeyMethod, Value: "package.service/method"},
-							},
-							Data: newMeanData(1, 1),
-						},
-					},
-				},
-				{
-					func() *view.View { return ClientRequestCountView },
-					[]*view.Row{
-						{
-							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 2, 2, 3, 2.5, 0.5),
 						},
 					},
 				},
 				{
-					func() *view.View { return ClientResponseCountView },
+					func() *view.View { return ClientReceivedMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 2, 1, 2, 1.5, 0.5),
 						},
@@ -187,8 +175,8 @@ func TestClientDefaultCollections(t *testing.T) {
 			},
 		},
 		{
-			"3",
-			[]*rpc{
+			label: "3",
+			rpcs: []*rpc{
 				{
 					[]tagPair{{k1, "v1"}},
 					&stats.RPCTagInfo{FullMethodName: "/package.service/method"},
@@ -229,67 +217,48 @@ func TestClientDefaultCollections(t *testing.T) {
 					&stats.End{Error: status.Error(codes.Aborted, "aborted")},
 				},
 			},
-			[]*wantData{
+			wants: []*wantData{
 				{
-					func() *view.View { return ClientErrorCountView },
+					func() *view.View { return ClientSentMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyStatus, Value: "Canceled"},
-								{Key: KeyMethod, Value: "package.service/method"},
-							},
-							Data: newMeanData(1, 1),
-						},
-						{
-							Tags: []tag.Tag{
-								{Key: KeyStatus, Value: "Aborted"},
-								{Key: KeyMethod, Value: "package.service/method"},
-							},
-							Data: newMeanData(1, 1),
-						},
-					},
-				},
-				{
-					func() *view.View { return ClientRequestCountView },
-					[]*view.Row{
-						{
-							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 2, 3, 2.666666666, 0.333333333*2),
 						},
 					},
 				},
 				{
-					func() *view.View { return ClientResponseCountView },
+					func() *view.View { return ClientReceivedMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 1, 2, 1.333333333, 0.333333333*2),
 						},
 					},
 				},
 				{
-					func() *view.View { return ClientRequestBytesView },
+					func() *view.View { return ClientSentBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
-							Data: newDistributionData([]int64{0, 1, 1, 1, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 8, 1, 65536, 13696.125, 481423542.982143*7),
+							Data: newDistributionData([]int64{0, 0, 0, 0, 0, 2 /*16384*/, 1 /*65536*/, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 20480, 66561, 36523, 1.355519318e+09),
 						},
 					},
 				},
 				{
-					func() *view.View { return ClientResponseBytesView },
+					func() *view.View { return ClientReceivedBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyClientMethod, Value: "package.service/method"},
 							},
-							Data: newDistributionData([]int64{0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 4, 1, 16384, 4864.25, 59678208.25*3),
+							Data: newDistributionData([]int64{0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 1, 18432, 6485.666667, 2.1459558466666666e+08),
 						},
 					},
 				},
@@ -297,16 +266,25 @@ func TestClientDefaultCollections(t *testing.T) {
 		},
 	}
 
+	views := []*view.View{
+		ClientSentBytesPerRPCView,
+		ClientReceivedBytesPerRPCView,
+		ClientRoundtripLatencyView,
+		ClientCompletedRPCsView,
+		ClientSentMessagesPerRPCView,
+		ClientReceivedMessagesPerRPCView,
+	}
+
 	for _, tc := range tcs {
 		// Register views.
-		if err := view.Subscribe(DefaultClientViews...); err != nil {
+		if err := view.Register(views...); err != nil {
 			t.Error(err)
 		}
 
 		h := &ClientHandler{}
 		h.StartOptions.Sampler = trace.NeverSample()
 		for _, rpc := range tc.rpcs {
-			mods := []tag.Mutator{}
+			var mods []tag.Mutator
 			for _, t := range rpc.tags {
 				mods = append(mods, tag.Upsert(t.k, t.v))
 			}
@@ -318,11 +296,14 @@ func TestClientDefaultCollections(t *testing.T) {
 			ctx = stats.SetTags(context.Background(), encoded)
 			ctx = h.TagRPC(ctx, rpc.tagInfo)
 			for _, out := range rpc.outPayloads {
+				out.Client = true
 				h.HandleRPC(ctx, out)
 			}
 			for _, in := range rpc.inPayloads {
+				in.Client = true
 				h.HandleRPC(ctx, in)
 			}
+			rpc.end.Client = true
 			h.HandleRPC(ctx, rpc.end)
 		}
 
@@ -349,7 +330,7 @@ func TestClientDefaultCollections(t *testing.T) {
 		}
 
 		// Unregister views to cleanup.
-		view.Unsubscribe(DefaultClientViews...)
+		view.Unregister(views...)
 	}
 }
 

vendor/go.opencensus.io/plugin/ocgrpc/end_to_end_test.go

@@ -0,0 +1,239 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package ocgrpc_test
+
+import (
+	"context"
+	"io"
+	"reflect"
+	"testing"
+
+	"go.opencensus.io/internal/testpb"
+	"go.opencensus.io/plugin/ocgrpc"
+	"go.opencensus.io/stats/view"
+	"go.opencensus.io/tag"
+)
+
+var keyAccountId, _ = tag.NewKey("account_id")
+
+func TestEndToEnd_Single(t *testing.T) {
+	view.Register(ocgrpc.DefaultClientViews...)
+	defer view.Unregister(ocgrpc.DefaultClientViews...)
+	view.Register(ocgrpc.DefaultServerViews...)
+	defer view.Unregister(ocgrpc.DefaultServerViews...)
+
+	extraViews := []*view.View{
+		ocgrpc.ServerReceivedMessagesPerRPCView,
+		ocgrpc.ClientReceivedMessagesPerRPCView,
+		ocgrpc.ServerSentMessagesPerRPCView,
+		ocgrpc.ClientSentMessagesPerRPCView,
+	}
+	view.Register(extraViews...)
+	defer view.Unregister(extraViews...)
+
+	client, done := testpb.NewTestClient(t)
+	defer done()
+
+	ctx := context.Background()
+	ctx, _ = tag.New(ctx, tag.Insert(keyAccountId, "abc123"))
+
+	var (
+		clientMethodTag        = tag.Tag{Key: ocgrpc.KeyClientMethod, Value: "testpb.Foo/Single"}
+		serverMethodTag        = tag.Tag{Key: ocgrpc.KeyServerMethod, Value: "testpb.Foo/Single"}
+		clientStatusOKTag      = tag.Tag{Key: ocgrpc.KeyClientStatus, Value: "OK"}
+		serverStatusOKTag      = tag.Tag{Key: ocgrpc.KeyServerStatus, Value: "OK"}
+		serverStatusUnknownTag = tag.Tag{Key: ocgrpc.KeyClientStatus, Value: "UNKNOWN"}
+		clientStatusUnknownTag = tag.Tag{Key: ocgrpc.KeyServerStatus, Value: "UNKNOWN"}
+	)
+
+	_, err := client.Single(ctx, &testpb.FooRequest{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	checkCount(t, ocgrpc.ClientCompletedRPCsView, 1, clientMethodTag, clientStatusOKTag)
+	checkCount(t, ocgrpc.ServerCompletedRPCsView, 1, serverMethodTag, serverStatusOKTag)
+
+	_, _ = client.Single(ctx, &testpb.FooRequest{Fail: true})
+	checkCount(t, ocgrpc.ClientCompletedRPCsView, 1, clientMethodTag, serverStatusUnknownTag)
+	checkCount(t, ocgrpc.ServerCompletedRPCsView, 1, serverMethodTag, clientStatusUnknownTag)
+
+	tcs := []struct {
+		v    *view.View
+		tags []tag.Tag
+		mean float64
+	}{
+		{ocgrpc.ClientSentMessagesPerRPCView, []tag.Tag{clientMethodTag}, 1.0},
+		{ocgrpc.ServerReceivedMessagesPerRPCView, []tag.Tag{serverMethodTag}, 1.0},
+		{ocgrpc.ClientReceivedMessagesPerRPCView, []tag.Tag{clientMethodTag}, 0.5},
+		{ocgrpc.ServerSentMessagesPerRPCView, []tag.Tag{serverMethodTag}, 0.5},
+		{ocgrpc.ClientSentBytesPerRPCView, []tag.Tag{clientMethodTag}, 1.0},
+		{ocgrpc.ServerReceivedBytesPerRPCView, []tag.Tag{serverMethodTag}, 1.0},
+		{ocgrpc.ClientReceivedBytesPerRPCView, []tag.Tag{clientMethodTag}, 0.0},
+		{ocgrpc.ServerSentBytesPerRPCView, []tag.Tag{serverMethodTag}, 0.0},
+	}
+
+	for _, tt := range tcs {
+		t.Run("view="+tt.v.Name, func(t *testing.T) {
+			dist := getDistribution(t, tt.v, tt.tags...)
+			if got, want := dist.Count, int64(2); got != want {
+				t.Errorf("Count = %d; want %d", got, want)
+			}
+			if got, want := dist.Mean, tt.mean; got != want {
+				t.Errorf("Mean = %v; want %v", got, want)
+			}
+		})
+	}
+}
+
+func TestEndToEnd_Stream(t *testing.T) {
+	view.Register(ocgrpc.DefaultClientViews...)
+	defer view.Unregister(ocgrpc.DefaultClientViews...)
+	view.Register(ocgrpc.DefaultServerViews...)
+	defer view.Unregister(ocgrpc.DefaultServerViews...)
+
+	extraViews := []*view.View{
+		ocgrpc.ServerReceivedMessagesPerRPCView,
+		ocgrpc.ClientReceivedMessagesPerRPCView,
+		ocgrpc.ServerSentMessagesPerRPCView,
+		ocgrpc.ClientSentMessagesPerRPCView,
+	}
+	view.Register(extraViews...)
+	defer view.Unregister(extraViews...)
+
+	client, done := testpb.NewTestClient(t)
+	defer done()
+
+	ctx := context.Background()
+	ctx, _ = tag.New(ctx, tag.Insert(keyAccountId, "abc123"))
+
+	var (
+		clientMethodTag   = tag.Tag{Key: ocgrpc.KeyClientMethod, Value: "testpb.Foo/Multiple"}
+		serverMethodTag   = tag.Tag{Key: ocgrpc.KeyServerMethod, Value: "testpb.Foo/Multiple"}
+		clientStatusOKTag = tag.Tag{Key: ocgrpc.KeyClientStatus, Value: "OK"}
+		serverStatusOKTag = tag.Tag{Key: ocgrpc.KeyServerStatus, Value: "OK"}
+	)
+
+	const msgCount = 3
+
+	stream, err := client.Multiple(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i := 0; i < msgCount; i++ {
+		stream.Send(&testpb.FooRequest{})
+		_, err := stream.Recv()
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := stream.CloseSend(); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = stream.Recv(); err != io.EOF {
+		t.Fatal(err)
+	}
+
+	checkCount(t, ocgrpc.ClientCompletedRPCsView, 1, clientMethodTag, clientStatusOKTag)
+	checkCount(t, ocgrpc.ServerCompletedRPCsView, 1, serverMethodTag, serverStatusOKTag)
+
+	tcs := []struct {
+		v   *view.View
+		tag tag.Tag
+	}{
+		{ocgrpc.ClientSentMessagesPerRPCView, clientMethodTag},
+		{ocgrpc.ServerReceivedMessagesPerRPCView, serverMethodTag},
+		{ocgrpc.ServerSentMessagesPerRPCView, serverMethodTag},
+		{ocgrpc.ClientReceivedMessagesPerRPCView, clientMethodTag},
+	}
+	for _, tt := range tcs {
+		serverSent := getDistribution(t, tt.v, tt.tag)
+		if got, want := serverSent.Mean, float64(msgCount); got != want {
+			t.Errorf("%q.Count = %v; want %v", ocgrpc.ServerSentMessagesPerRPCView.Name, got, want)
+		}
+	}
+}
+
+func checkCount(t *testing.T, v *view.View, want int64, tags ...tag.Tag) {
+	if got, ok := getCount(t, v, tags...); ok && got != want {
+		t.Errorf("View[name=%q].Row[tags=%v].Data = %d; want %d", v.Name, tags, got, want)
+	}
+}
+
+func getCount(t *testing.T, v *view.View, tags ...tag.Tag) (int64, bool) {
+	if len(tags) != len(v.TagKeys) {
+		t.Errorf("Invalid tag specification, want %#v tags got %#v", v.TagKeys, tags)
+		return 0, false
+	}
+	for i := range v.TagKeys {
+		if tags[i].Key != v.TagKeys[i] {
+			t.Errorf("Invalid tag specification, want %#v tags got %#v", v.TagKeys, tags)
+			return 0, false
+		}
+	}
+	rows, err := view.RetrieveData(v.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var foundRow *view.Row
+	for _, row := range rows {
+		if reflect.DeepEqual(row.Tags, tags) {
+			foundRow = row
+			break
+		}
+	}
+	if foundRow == nil {
+		var gotTags [][]tag.Tag
+		for _, row := range rows {
+			gotTags = append(gotTags, row.Tags)
+		}
+		t.Errorf("Failed to find row with keys %v among:\n%v", tags, gotTags)
+		return 0, false
+	}
+	return foundRow.Data.(*view.CountData).Value, true
+}
+
+func getDistribution(t *testing.T, v *view.View, tags ...tag.Tag) *view.DistributionData {
+	if len(tags) != len(v.TagKeys) {
+		t.Fatalf("Invalid tag specification, want %#v tags got %#v", v.TagKeys, tags)
+		return nil
+	}
+	for i := range v.TagKeys {
+		if tags[i].Key != v.TagKeys[i] {
+			t.Fatalf("Invalid tag specification, want %#v tags got %#v", v.TagKeys, tags)
+			return nil
+		}
+	}
+	rows, err := view.RetrieveData(v.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var foundRow *view.Row
+	for _, row := range rows {
+		if reflect.DeepEqual(row.Tags, tags) {
+			foundRow = row
+			break
+		}
+	}
+	if foundRow == nil {
+		var gotTags [][]tag.Tag
+		for _, row := range rows {
+			gotTags = append(gotTags, row.Tags)
+		}
+		t.Fatalf("Failed to find row with keys %v among:\n%v", tags, gotTags)
+		return nil
+	}
+	return foundRow.Data.(*view.DistributionData)
+}

vendor/go.opencensus.io/plugin/ocgrpc/example_test.go

@@ -24,7 +24,7 @@ import (
 
 func ExampleClientHandler() {
 	// Subscribe views to collect data.
-	if err := view.Subscribe(ocgrpc.DefaultClientViews...); err != nil {
+	if err := view.Register(ocgrpc.DefaultClientViews...); err != nil {
 		log.Fatal(err)
 	}
 
@@ -39,7 +39,7 @@ func ExampleClientHandler() {
 
 func ExampleServerHandler() {
 	// Subscribe to views to collect data.
-	if err := view.Subscribe(ocgrpc.DefaultServerViews...); err != nil {
+	if err := view.Register(ocgrpc.DefaultServerViews...); err != nil {
 		log.Fatal(err)
 	}
 

vendor/go.opencensus.io/plugin/ocgrpc/grpc_test.go

@@ -31,14 +31,12 @@ func TestClientHandler(t *testing.T) {
 	ctx := context.Background()
 	te := &traceExporter{}
 	trace.RegisterExporter(te)
-	if err := ClientRequestCountView.Subscribe(); err != nil {
+	if err := view.Register(ClientSentMessagesPerRPCView); err != nil {
 		t.Fatal(err)
 	}
+	defer view.Unregister(ClientSentMessagesPerRPCView)
 
-	span := trace.NewSpan("/foo", nil, trace.StartOptions{
-		Sampler: trace.AlwaysSample(),
-	})
-	ctx = trace.WithSpan(ctx, span)
+	ctx, _ = trace.StartSpan(ctx, "/foo", trace.WithSampler(trace.AlwaysSample()))
 
 	var handler ClientHandler
 	ctx = handler.TagRPC(ctx, &stats.RPCTagInfo{
@@ -53,7 +51,7 @@ func TestClientHandler(t *testing.T) {
 		EndTime: time.Now(),
 	})
 
-	stats, err := view.RetrieveData(ClientRequestCountView.Name)
+	stats, err := view.RetrieveData(ClientSentMessagesPerRPCView.Name)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -65,9 +63,6 @@ func TestClientHandler(t *testing.T) {
 	if got, want := len(traces), 1; got != want {
 		t.Errorf("Got %v traces; want %v", got, want)
 	}
-
-	// Cleanup.
-	view.Unsubscribe(ClientErrorCountView)
 }
 
 func TestServerHandler(t *testing.T) {
@@ -94,7 +89,7 @@ func TestServerHandler(t *testing.T) {
 
 			te := &traceExporter{}
 			trace.RegisterExporter(te)
-			if err := ServerRequestCountView.Subscribe(); err != nil {
+			if err := view.Register(ServerCompletedRPCsView); err != nil {
 				t.Fatal(err)
 			}
 
@@ -112,7 +107,7 @@ func TestServerHandler(t *testing.T) {
 				EndTime: time.Now(),
 			})
 
-			rows, err := view.RetrieveData(ServerRequestCountView.Name)
+			rows, err := view.RetrieveData(ServerCompletedRPCsView.Name)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -126,7 +121,7 @@ func TestServerHandler(t *testing.T) {
 			}
 
 			// Cleanup.
-			view.Unsubscribe(ServerRequestCountView)
+			view.Unregister(ServerCompletedRPCsView)
 		})
 	}
 }

vendor/go.opencensus.io/plugin/ocgrpc/server.go

@@ -69,7 +69,7 @@ func (s *ServerHandler) TagConn(ctx context.Context, cti *stats.ConnTagInfo) con
 // HandleRPC implements per-RPC tracing and stats instrumentation.
 func (s *ServerHandler) HandleRPC(ctx context.Context, rs stats.RPCStats) {
 	traceHandleRPC(ctx, rs)
-	s.statsHandleRPC(ctx, rs)
+	statsHandleRPC(ctx, rs)
 }
 
 // TagRPC implements per-RPC context management.

vendor/go.opencensus.io/plugin/ocgrpc/server_metrics.go

@@ -23,14 +23,11 @@ import (
 
 // The following variables are measures are recorded by ServerHandler:
 var (
-	ServerErrorCount, _        = stats.Int64("grpc.io/server/error_count", "RPC Errors", stats.UnitNone)
-	ServerServerElapsedTime, _ = stats.Float64("grpc.io/server/server_elapsed_time", "Server elapsed time in msecs", stats.UnitMilliseconds)
-	ServerRequestBytes, _      = stats.Int64("grpc.io/server/request_bytes", "Request bytes", stats.UnitBytes)
-	ServerResponseBytes, _     = stats.Int64("grpc.io/server/response_bytes", "Response bytes", stats.UnitBytes)
-	ServerStartedCount, _      = stats.Int64("grpc.io/server/started_count", "Number of server RPCs (streams) started", stats.UnitNone)
-	ServerFinishedCount, _     = stats.Int64("grpc.io/server/finished_count", "Number of server RPCs (streams) finished", stats.UnitNone)
-	ServerRequestCount, _      = stats.Int64("grpc.io/server/request_count", "Number of server RPC request messages", stats.UnitNone)
-	ServerResponseCount, _     = stats.Int64("grpc.io/server/response_count", "Number of server RPC response messages", stats.UnitNone)
+	ServerReceivedMessagesPerRPC = stats.Int64("grpc.io/server/received_messages_per_rpc", "Number of messages received in each RPC. Has value 1 for non-streaming RPCs.", stats.UnitDimensionless)
+	ServerReceivedBytesPerRPC    = stats.Int64("grpc.io/server/received_bytes_per_rpc", "Total bytes received across all messages per RPC.", stats.UnitBytes)
+	ServerSentMessagesPerRPC     = stats.Int64("grpc.io/server/sent_messages_per_rpc", "Number of messages sent in each RPC. Has value 1 for non-streaming RPCs.", stats.UnitDimensionless)
+	ServerSentBytesPerRPC        = stats.Int64("grpc.io/server/sent_bytes_per_rpc", "Total bytes sent in across all response messages per RPC.", stats.UnitBytes)
+	ServerLatency                = stats.Float64("grpc.io/server/server_latency", "Time between first byte of request received to last byte of response sent, or terminal error.", stats.UnitMilliseconds)
 )
 
 // TODO(acetechnologist): This is temporary and will need to be replaced by a
@@ -42,63 +39,59 @@ var (
 // package. These are declared as a convenience only; none are subscribed by
 // default.
 var (
-	ServerErrorCountView = &view.View{
-		Name:        "grpc.io/server/error_count",
-		Description: "RPC Errors",
-		TagKeys:     []tag.Key{KeyMethod, KeyStatus},
-		Measure:     ServerErrorCount,
-		Aggregation: view.Count(),
+	ServerReceivedBytesPerRPCView = &view.View{
+		Name:        "grpc.io/server/received_bytes_per_rpc",
+		Description: "Distribution of received bytes per RPC, by method.",
+		Measure:     ServerReceivedBytesPerRPC,
+		TagKeys:     []tag.Key{KeyServerMethod},
+		Aggregation: DefaultBytesDistribution,
 	}
 
-	ServerServerElapsedTimeView = &view.View{
-		Name:        "grpc.io/server/server_elapsed_time",
-		Description: "Server elapsed time in msecs",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ServerServerElapsedTime,
+	ServerSentBytesPerRPCView = &view.View{
+		Name:        "grpc.io/server/sent_bytes_per_rpc",
+		Description: "Distribution of total sent bytes per RPC, by method.",
+		Measure:     ServerSentBytesPerRPC,
+		TagKeys:     []tag.Key{KeyServerMethod},
+		Aggregation: DefaultBytesDistribution,
+	}
+
+	ServerLatencyView = &view.View{
+		Name:        "grpc.io/server/server_latency",
+		Description: "Distribution of server latency in milliseconds, by method.",
+		TagKeys:     []tag.Key{KeyServerMethod},
+		Measure:     ServerLatency,
 		Aggregation: DefaultMillisecondsDistribution,
 	}
 
-	ServerRequestBytesView = &view.View{
-		Name:        "grpc.io/server/request_bytes",
-		Description: "Request bytes",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ServerRequestBytes,
-		Aggregation: DefaultBytesDistribution,
+	ServerCompletedRPCsView = &view.View{
+		Name:        "grpc.io/server/completed_rpcs",
+		Description: "Count of RPCs by method and status.",
+		TagKeys:     []tag.Key{KeyServerMethod, KeyServerStatus},
+		Measure:     ServerLatency,
+		Aggregation: view.Count(),
 	}
 
-	ServerResponseBytesView = &view.View{
-		Name:        "grpc.io/server/response_bytes",
-		Description: "Response bytes",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ServerResponseBytes,
-		Aggregation: DefaultBytesDistribution,
-	}
-
-	ServerRequestCountView = &view.View{
-		Name:        "grpc.io/server/request_count",
-		Description: "Count of request messages per server RPC",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ServerRequestCount,
+	ServerReceivedMessagesPerRPCView = &view.View{
+		Name:        "grpc.io/server/received_messages_per_rpc",
+		Description: "Distribution of messages received count per RPC, by method.",
+		TagKeys:     []tag.Key{KeyServerMethod},
+		Measure:     ServerReceivedMessagesPerRPC,
 		Aggregation: DefaultMessageCountDistribution,
 	}
 
-	ServerResponseCountView = &view.View{
-		Name:        "grpc.io/server/response_count",
-		Description: "Count of response messages per server RPC",
-		TagKeys:     []tag.Key{KeyMethod},
-		Measure:     ServerResponseCount,
+	ServerSentMessagesPerRPCView = &view.View{
+		Name:        "grpc.io/server/sent_messages_per_rpc",
+		Description: "Distribution of messages sent count per RPC, by method.",
+		TagKeys:     []tag.Key{KeyServerMethod},
+		Measure:     ServerSentMessagesPerRPC,
 		Aggregation: DefaultMessageCountDistribution,
 	}
 )
 
 // DefaultServerViews are the default server views provided by this package.
 var DefaultServerViews = []*view.View{
-	ServerErrorCountView,
-	ServerServerElapsedTimeView,
-	ServerRequestBytesView,
-	ServerResponseBytesView,
-	ServerRequestCountView,
-	ServerResponseCountView,
+	ServerReceivedBytesPerRPCView,
+	ServerSentBytesPerRPCView,
+	ServerLatencyView,
+	ServerCompletedRPCsView,
 }
-
-// TODO(jbd): Add roundtrip_latency, uncompressed_request_bytes, uncompressed_response_bytes, request_count, response_count.

vendor/go.opencensus.io/plugin/ocgrpc/server_spec_test.go

@@ -0,0 +1,146 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package ocgrpc
+
+import (
+	"strings"
+	"testing"
+
+	"go.opencensus.io/stats"
+	"go.opencensus.io/stats/view"
+)
+
+func TestSpecServerMeasures(t *testing.T) {
+	spec := `
+| Measure name                             | Unit | Description                                                                                   |
+|------------------------------------------|------|-----------------------------------------------------------------------------------------------|
+| grpc.io/server/received_messages_per_rpc | 1    | Number of messages received in each RPC. Has value 1 for non-streaming RPCs.                  |
+| grpc.io/server/received_bytes_per_rpc    | By   | Total bytes received across all messages per RPC.                                             |
+| grpc.io/server/sent_messages_per_rpc     | 1    | Number of messages sent in each RPC. Has value 1 for non-streaming RPCs.                      |
+| grpc.io/server/sent_bytes_per_rpc        | By   | Total bytes sent in across all response messages per RPC.                                     |
+| grpc.io/server/server_latency            | ms   | Time between first byte of request received to last byte of response sent, or terminal error. |`
+
+	lines := strings.Split(spec, "\n")[3:]
+	type measureDef struct {
+		name string
+		unit string
+		desc string
+	}
+	measureDefs := make([]measureDef, 0, len(lines))
+	for _, line := range lines {
+		cols := colSep.Split(line, -1)[1:]
+		if len(cols) < 3 {
+			t.Fatalf("Invalid config line %#v", cols)
+		}
+		measureDefs = append(measureDefs, measureDef{cols[0], cols[1], cols[2]})
+	}
+
+	gotMeasures := []stats.Measure{
+		ServerReceivedMessagesPerRPC,
+		ServerReceivedBytesPerRPC,
+		ServerSentMessagesPerRPC,
+		ServerSentBytesPerRPC,
+		ServerLatency,
+	}
+
+	if got, want := len(gotMeasures), len(measureDefs); got != want {
+		t.Fatalf("len(gotMeasures) = %d; want %d", got, want)
+	}
+
+	for i, m := range gotMeasures {
+		defn := measureDefs[i]
+		if got, want := m.Name(), defn.name; got != want {
+			t.Errorf("Name = %q; want %q", got, want)
+		}
+		if got, want := m.Unit(), defn.unit; got != want {
+			t.Errorf("%q: Unit = %q; want %q", defn.name, got, want)
+		}
+		if got, want := m.Description(), defn.desc; got != want {
+			t.Errorf("%q: Description = %q; want %q", defn.name, got, want)
+		}
+	}
+}
+
+func TestSpecServerViews(t *testing.T) {
+	defaultViewsSpec := `
+| View name                             | Measure suffix         | Aggregation  | Tags suffix                  |
+|---------------------------------------|------------------------|--------------|------------------------------|
+| grpc.io/server/received_bytes_per_rpc | received_bytes_per_rpc | distribution | server_method                |
+| grpc.io/server/sent_bytes_per_rpc     | sent_bytes_per_rpc     | distribution | server_method                |
+| grpc.io/server/server_latency         | server_latency         | distribution | server_method                |
+| grpc.io/server/completed_rpcs         | server_latency         | count        | server_method, server_status |`
+
+	extraViewsSpec := `
+| View name                                | Measure suffix            | Aggregation  | Tags suffix   |
+|------------------------------------------|---------------------------|--------------|---------------|
+| grpc.io/server/received_messages_per_rpc | received_messages_per_rpc | distribution | server_method |
+| grpc.io/server/sent_messages_per_rpc     | sent_messages_per_rpc     | distribution | server_method |`
+
+	lines := strings.Split(defaultViewsSpec, "\n")[3:]
+	lines = append(lines, strings.Split(extraViewsSpec, "\n")[3:]...)
+	type viewDef struct {
+		name          string
+		measureSuffix string
+		aggregation   string
+		tags          string
+	}
+	viewDefs := make([]viewDef, 0, len(lines))
+	for _, line := range lines {
+		cols := colSep.Split(line, -1)[1:]
+		if len(cols) < 4 {
+			t.Fatalf("Invalid config line %#v", cols)
+		}
+		viewDefs = append(viewDefs, viewDef{cols[0], cols[1], cols[2], cols[3]})
+	}
+
+	views := DefaultServerViews
+	views = append(views, ServerReceivedMessagesPerRPCView, ServerSentMessagesPerRPCView)
+
+	if got, want := len(views), len(viewDefs); got != want {
+		t.Fatalf("len(gotMeasures) = %d; want %d", got, want)
+	}
+
+	for i, v := range views {
+		defn := viewDefs[i]
+		if got, want := v.Name, defn.name; got != want {
+			t.Errorf("Name = %q; want %q", got, want)
+		}
+		if got, want := v.Measure.Name(), "grpc.io/server/"+defn.measureSuffix; got != want {
+			t.Errorf("%q: Measure.Name = %q; want %q", defn.name, got, want)
+		}
+		switch v.Aggregation.Type {
+		case view.AggTypeDistribution:
+			if got, want := "distribution", defn.aggregation; got != want {
+				t.Errorf("%q: Description = %q; want %q", defn.name, got, want)
+			}
+		case view.AggTypeCount:
+			if got, want := "count", defn.aggregation; got != want {
+				t.Errorf("%q: Description = %q; want %q", defn.name, got, want)
+			}
+		default:
+			t.Errorf("Invalid aggregation type")
+		}
+		wantTags := strings.Split(defn.tags, ", ")
+		if got, want := len(v.TagKeys), len(wantTags); got != want {
+			t.Errorf("len(TagKeys) = %d; want %d", got, want)
+		}
+		for j := range wantTags {
+			if got, want := v.TagKeys[j].Name(), "grpc_"+wantTags[j]; got != want {
+				t.Errorf("TagKeys[%d].Name() = %q; want %q", j, got, want)
+			}
+		}
+	}
+}

vendor/go.opencensus.io/plugin/ocgrpc/server_stats_handler.go

@@ -16,17 +16,13 @@
 package ocgrpc
 
 import (
-	"fmt"
-	"sync/atomic"
 	"time"
 
 	"golang.org/x/net/context"
 
-	ocstats "go.opencensus.io/stats"
 	"go.opencensus.io/tag"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/stats"
-	"google.golang.org/grpc/status"
 )
 
 // statsTagRPC gets the metadata from gRPC context, extracts the encoded tags from
@@ -35,7 +31,7 @@ func (h *ServerHandler) statsTagRPC(ctx context.Context, info *stats.RPCTagInfo)
 	startTime := time.Now()
 	if info == nil {
 		if grpclog.V(2) {
-			grpclog.Infof("serverHandler.TagRPC called with nil info.", info.FullMethodName)
+			grpclog.Infof("opencensus: TagRPC called with nil info.")
 		}
 		return ctx
 	}
@@ -43,95 +39,25 @@ func (h *ServerHandler) statsTagRPC(ctx context.Context, info *stats.RPCTagInfo)
 		startTime: startTime,
 		method:    info.FullMethodName,
 	}
-	ctx, _ = h.createTags(ctx)
-	record(ctx, d, "", ServerStartedCount.M(1))
-	return context.WithValue(ctx, grpcServerRPCKey, d)
+	propagated := h.extractPropagatedTags(ctx)
+	ctx = tag.NewContext(ctx, propagated)
+	ctx, _ = tag.New(ctx, tag.Upsert(KeyServerMethod, methodName(info.FullMethodName)))
+	return context.WithValue(ctx, rpcDataKey, d)
 }
 
-// statsHandleRPC processes the RPC events.
-func (h *ServerHandler) statsHandleRPC(ctx context.Context, s stats.RPCStats) {
-	switch st := s.(type) {
-	case *stats.Begin, *stats.InHeader, *stats.InTrailer, *stats.OutHeader, *stats.OutTrailer:
-		// Do nothing for server
-	case *stats.InPayload:
-		h.handleRPCInPayload(ctx, st)
-	case *stats.OutPayload:
-		// For stream it can be called multiple times per RPC.
-		h.handleRPCOutPayload(ctx, st)
-	case *stats.End:
-		h.handleRPCEnd(ctx, st)
-	default:
-		grpclog.Infof("unexpected stats: %T", st)
-	}
-}
-
-func (h *ServerHandler) handleRPCInPayload(ctx context.Context, s *stats.InPayload) {
-	d, ok := ctx.Value(grpcServerRPCKey).(*rpcData)
-	if !ok {
-		if grpclog.V(2) {
-			grpclog.Infoln("handleRPCInPayload: failed to retrieve *rpcData from context")
-		}
-		return
-	}
-
-	record(ctx, d, "", ServerRequestBytes.M(int64(s.Length)))
-	atomic.AddInt64(&d.reqCount, 1)
-}
-
-func (h *ServerHandler) handleRPCOutPayload(ctx context.Context, s *stats.OutPayload) {
-	d, ok := ctx.Value(grpcServerRPCKey).(*rpcData)
-	if !ok {
-		if grpclog.V(2) {
-			grpclog.Infoln("handleRPCOutPayload: failed to retrieve *rpcData from context")
-		}
-		return
-	}
-
-	record(ctx, d, "", ServerResponseBytes.M(int64(s.Length)))
-	atomic.AddInt64(&d.respCount, 1)
-}
-
-func (h *ServerHandler) handleRPCEnd(ctx context.Context, s *stats.End) {
-	d, ok := ctx.Value(grpcServerRPCKey).(*rpcData)
-	if !ok {
-		if grpclog.V(2) {
-			grpclog.Infoln("serverHandler.handleRPCEnd failed to retrieve *rpcData from context")
-		}
-		return
-	}
-
-	elapsedTime := time.Since(d.startTime)
-	reqCount := atomic.LoadInt64(&d.reqCount)
-	respCount := atomic.LoadInt64(&d.respCount)
-
-	m := []ocstats.Measurement{
-		ServerRequestCount.M(reqCount),
-		ServerResponseCount.M(respCount),
-		ServerFinishedCount.M(1),
-		ServerServerElapsedTime.M(float64(elapsedTime) / float64(time.Millisecond)),
-	}
-
-	var st string
-	if s.Error != nil {
-		s, ok := status.FromError(s.Error)
-		if ok {
-			st = s.Code().String()
-		}
-		m = append(m, ServerErrorCount.M(1))
-	}
-	record(ctx, d, st, m...)
-}
-
-// createTags creates a new tag map containing the tags extracted from the
+// extractPropagatedTags creates a new tag map containing the tags extracted from the
 // gRPC metadata.
-func (h *ServerHandler) createTags(ctx context.Context) (context.Context, error) {
+func (h *ServerHandler) extractPropagatedTags(ctx context.Context) *tag.Map {
 	buf := stats.Tags(ctx)
 	if buf == nil {
-		return ctx, nil
+		return nil
 	}
 	propagated, err := tag.Decode(buf)
 	if err != nil {
-		return nil, fmt.Errorf("serverHandler.createTags failed to decode: %v", err)
+		if grpclog.V(2) {
+			grpclog.Warningf("opencensus: Failed to decode tags from gRPC metadata failed to decode: %v", err)
+		}
+		return nil
 	}
-	return tag.NewContext(ctx, propagated), nil
+	return propagated
 }

vendor/go.opencensus.io/plugin/ocgrpc/server_stats_handler_test.go

@@ -74,44 +74,44 @@ func TestServerDefaultCollections(t *testing.T) {
 			},
 			[]*wantData{
 				{
-					func() *view.View { return ServerRequestCountView },
+					func() *view.View { return ServerReceivedMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 1, 1, 1, 0),
 						},
 					},
 				},
 				{
-					func() *view.View { return ServerResponseCountView },
+					func() *view.View { return ServerSentMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 1, 1, 1, 0),
 						},
 					},
 				},
 				{
-					func() *view.View { return ServerRequestBytesView },
+					func() *view.View { return ServerReceivedBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 10, 10, 10, 0),
 						},
 					},
 				},
 				{
-					func() *view.View { return ServerResponseBytesView },
+					func() *view.View { return ServerSentBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 10, 10, 10, 0),
 						},
@@ -151,34 +151,22 @@ func TestServerDefaultCollections(t *testing.T) {
 			},
 			[]*wantData{
 				{
-					func() *view.View { return ServerErrorCountView },
+					func() *view.View { return ServerReceivedMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyStatus, Value: "Canceled"},
-								{Key: KeyMethod, Value: "package.service/method"},
-							},
-							Data: newCountData(1),
-						},
-					},
-				},
-				{
-					func() *view.View { return ServerRequestCountView },
-					[]*view.Row{
-						{
-							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 2, 1, 2, 1.5, 0.5),
 						},
 					},
 				},
 				{
-					func() *view.View { return ServerResponseCountView },
+					func() *view.View { return ServerSentMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 2, 2, 3, 2.5, 0.5),
 						},
@@ -231,65 +219,46 @@ func TestServerDefaultCollections(t *testing.T) {
 			},
 			[]*wantData{
 				{
-					func() *view.View { return ServerErrorCountView },
+					func() *view.View { return ServerReceivedMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyStatus, Value: "Canceled"},
-								{Key: KeyMethod, Value: "package.service/method"},
-							},
-							Data: newCountData(1),
-						},
-						{
-							Tags: []tag.Tag{
-								{Key: KeyStatus, Value: "Aborted"},
-								{Key: KeyMethod, Value: "package.service/method"},
-							},
-							Data: newCountData(1),
-						},
-					},
-				},
-				{
-					func() *view.View { return ServerRequestCountView },
-					[]*view.Row{
-						{
-							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 1, 2, 1.333333333, 0.333333333*2),
 						},
 					},
 				},
 				{
-					func() *view.View { return ServerResponseCountView },
+					func() *view.View { return ServerSentMessagesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
 							Data: newDistributionData([]int64{0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 2, 3, 2.666666666, 0.333333333*2),
 						},
 					},
 				},
 				{
-					func() *view.View { return ServerRequestBytesView },
+					func() *view.View { return ServerReceivedBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
-							Data: newDistributionData([]int64{0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 4, 1, 16384, 4864.25, 59678208.25*3),
+							Data: newDistributionData([]int64{0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 1, 18432, 6485.6666667, 2.1459558466666667e+08),
 						},
 					},
 				},
 				{
-					func() *view.View { return ServerResponseBytesView },
+					func() *view.View { return ServerSentBytesPerRPCView },
 					[]*view.Row{
 						{
 							Tags: []tag.Tag{
-								{Key: KeyMethod, Value: "package.service/method"},
+								{Key: KeyServerMethod, Value: "package.service/method"},
 							},
-							Data: newDistributionData([]int64{0, 1, 1, 1, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 8, 1, 65536, 13696.125, 481423542.982143*7),
+							Data: newDistributionData([]int64{0, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 3, 20480, 66561, 36523, 1.355519318e+09),
 						},
 					},
 				},
@@ -297,8 +266,10 @@ func TestServerDefaultCollections(t *testing.T) {
 		},
 	}
 
+	views := append(DefaultServerViews[:], ServerReceivedMessagesPerRPCView, ServerSentMessagesPerRPCView)
+
 	for _, tc := range tcs {
-		if err := view.Subscribe(DefaultServerViews...); err != nil {
+		if err := view.Register(views...); err != nil {
 			t.Fatal(err)
 		}
 
@@ -349,18 +320,12 @@ func TestServerDefaultCollections(t *testing.T) {
 		}
 
 		// Unregister views to cleanup.
-		view.Unsubscribe(DefaultServerViews...)
+		view.Unregister(views...)
 	}
 }
 
 func newCountData(v int) *view.CountData {
-	cav := view.CountData(v)
-	return &cav
-}
-
-func newMeanData(count int64, mean float64) *view.MeanData {
-	mav := view.MeanData{Count: count, Mean: mean}
-	return &mav
+	return &view.CountData{Value: int64(v)}
 }
 
 func newDistributionData(countPerBucket []int64, count int64, min, max, mean, sumOfSquaredDev float64) *view.DistributionData {

vendor/go.opencensus.io/plugin/ocgrpc/stats_common.go

@@ -16,13 +16,19 @@
 package ocgrpc
 
 import (
+	"context"
+	"strconv"
 	"strings"
+	"sync/atomic"
 	"time"
 
 	ocstats "go.opencensus.io/stats"
 	"go.opencensus.io/stats/view"
 	"go.opencensus.io/tag"
-	"golang.org/x/net/context"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
 )
 
 type grpcInstrumentationKey string
@@ -33,7 +39,7 @@ type grpcInstrumentationKey string
 type rpcData struct {
 	// reqCount and respCount has to be the first words
 	// in order to be 64-aligned on 32-bit architectures.
-	reqCount, respCount int64 // access atomically
+	sentCount, sentBytes, recvCount, recvBytes int64 // access atomically
 
 	// startTime represents the time at which TagRPC was invoked at the
 	// beginning of an RPC. It is an appoximation of the time when the
@@ -46,32 +52,148 @@ type rpcData struct {
 // both the default GRPC client and GRPC server metrics.
 var (
 	DefaultBytesDistribution        = view.Distribution(0, 1024, 2048, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216, 67108864, 268435456, 1073741824, 4294967296)
-	DefaultMillisecondsDistribution = view.Distribution(0, 1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 30, 40, 50, 65, 80, 100, 130, 160, 200, 250, 300, 400, 500, 650, 800, 1000, 2000, 5000, 10000, 20000, 50000, 100000)
+	DefaultMillisecondsDistribution = view.Distribution(0, 0.01, 0.05, 0.1, 0.3, 0.6, 0.8, 1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 30, 40, 50, 65, 80, 100, 130, 160, 200, 250, 300, 400, 500, 650, 800, 1000, 2000, 5000, 10000, 20000, 50000, 100000)
 	DefaultMessageCountDistribution = view.Distribution(0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536)
 )
 
 var (
-	KeyMethod, _ = tag.NewKey("method")           // gRPC service and method name
-	KeyStatus, _ = tag.NewKey("canonical_status") // Canonical status code
+	KeyServerMethod, _ = tag.NewKey("grpc_server_method")
+	KeyClientMethod, _ = tag.NewKey("grpc_client_method")
+	KeyServerStatus, _ = tag.NewKey("grpc_server_status")
+	KeyClientStatus, _ = tag.NewKey("grpc_client_status")
 )
 
 var (
-	grpcServerConnKey = grpcInstrumentationKey("server-conn")
-	grpcServerRPCKey  = grpcInstrumentationKey("server-rpc")
-	grpcClientRPCKey  = grpcInstrumentationKey("client-rpc")
+	rpcDataKey = grpcInstrumentationKey("opencensus-rpcData")
 )
 
 func methodName(fullname string) string {
 	return strings.TrimLeft(fullname, "/")
 }
 
-func record(ctx context.Context, data *rpcData, status string, m ...ocstats.Measurement) {
-	mods := []tag.Mutator{
-		tag.Upsert(KeyMethod, methodName(data.method)),
+// statsHandleRPC processes the RPC events.
+func statsHandleRPC(ctx context.Context, s stats.RPCStats) {
+	switch st := s.(type) {
+	case *stats.Begin, *stats.OutHeader, *stats.InHeader, *stats.InTrailer, *stats.OutTrailer:
+		// do nothing for client
+	case *stats.OutPayload:
+		handleRPCOutPayload(ctx, st)
+	case *stats.InPayload:
+		handleRPCInPayload(ctx, st)
+	case *stats.End:
+		handleRPCEnd(ctx, st)
+	default:
+		grpclog.Infof("unexpected stats: %T", st)
+	}
+}
+
+func handleRPCOutPayload(ctx context.Context, s *stats.OutPayload) {
+	d, ok := ctx.Value(rpcDataKey).(*rpcData)
+	if !ok {
+		if grpclog.V(2) {
+			grpclog.Infoln("Failed to retrieve *rpcData from context.")
+		}
+		return
+	}
+
+	atomic.AddInt64(&d.sentBytes, int64(s.Length))
+	atomic.AddInt64(&d.sentCount, 1)
+}
+
+func handleRPCInPayload(ctx context.Context, s *stats.InPayload) {
+	d, ok := ctx.Value(rpcDataKey).(*rpcData)
+	if !ok {
+		if grpclog.V(2) {
+			grpclog.Infoln("Failed to retrieve *rpcData from context.")
+		}
+		return
+	}
+
+	atomic.AddInt64(&d.recvBytes, int64(s.Length))
+	atomic.AddInt64(&d.recvCount, 1)
+}
+
+func handleRPCEnd(ctx context.Context, s *stats.End) {
+	d, ok := ctx.Value(rpcDataKey).(*rpcData)
+	if !ok {
+		if grpclog.V(2) {
+			grpclog.Infoln("Failed to retrieve *rpcData from context.")
+		}
+		return
+	}
+
+	elapsedTime := time.Since(d.startTime)
+
+	var st string
+	if s.Error != nil {
+		s, ok := status.FromError(s.Error)
+		if ok {
+			st = statusCodeToString(s)
+		}
+	} else {
+		st = "OK"
+	}
+
+	latencyMillis := float64(elapsedTime) / float64(time.Millisecond)
+	if s.Client {
+		ctx, _ = tag.New(ctx,
+			tag.Upsert(KeyClientMethod, methodName(d.method)),
+			tag.Upsert(KeyClientStatus, st))
+		ocstats.Record(ctx,
+			ClientSentBytesPerRPC.M(atomic.LoadInt64(&d.sentBytes)),
+			ClientSentMessagesPerRPC.M(atomic.LoadInt64(&d.sentCount)),
+			ClientReceivedMessagesPerRPC.M(atomic.LoadInt64(&d.recvCount)),
+			ClientReceivedBytesPerRPC.M(atomic.LoadInt64(&d.recvBytes)),
+			ClientRoundtripLatency.M(latencyMillis))
+	} else {
+		ctx, _ = tag.New(ctx, tag.Upsert(KeyServerStatus, st))
+		ocstats.Record(ctx,
+			ServerSentBytesPerRPC.M(atomic.LoadInt64(&d.sentBytes)),
+			ServerSentMessagesPerRPC.M(atomic.LoadInt64(&d.sentCount)),
+			ServerReceivedMessagesPerRPC.M(atomic.LoadInt64(&d.recvCount)),
+			ServerReceivedBytesPerRPC.M(atomic.LoadInt64(&d.recvBytes)),
+			ServerLatency.M(latencyMillis))
+	}
+}
+
+func statusCodeToString(s *status.Status) string {
+	// see https://github.com/grpc/grpc/blob/master/doc/statuscodes.md
+	switch c := s.Code(); c {
+	case codes.OK:
+		return "OK"
+	case codes.Canceled:
+		return "CANCELLED"
+	case codes.Unknown:
+		return "UNKNOWN"
+	case codes.InvalidArgument:
+		return "INVALID_ARGUMENT"
+	case codes.DeadlineExceeded:
+		return "DEADLINE_EXCEEDED"
+	case codes.NotFound:
+		return "NOT_FOUND"
+	case codes.AlreadyExists:
+		return "ALREADY_EXISTS"
+	case codes.PermissionDenied:
+		return "PERMISSION_DENIED"
+	case codes.ResourceExhausted:
+		return "RESOURCE_EXHAUSTED"
+	case codes.FailedPrecondition:
+		return "FAILED_PRECONDITION"
+	case codes.Aborted:
+		return "ABORTED"
+	case codes.OutOfRange:
+		return "OUT_OF_RANGE"
+	case codes.Unimplemented:
+		return "UNIMPLEMENTED"
+	case codes.Internal:
+		return "INTERNAL"
+	case codes.Unavailable:
+		return "UNAVAILABLE"
+	case codes.DataLoss:
+		return "DATA_LOSS"
+	case codes.Unauthenticated:
+		return "UNAUTHENTICATED"
+	default:
+		return "CODE_" + strconv.FormatInt(int64(c), 10)
 	}
-	if status != "" {
-		mods = append(mods, tag.Upsert(KeyStatus, status))
-	}
-	ctx, _ = tag.New(ctx, mods...)
-	ocstats.Record(ctx, m...)
 }

vendor/go.opencensus.io/plugin/ocgrpc/trace_common.go

@@ -36,11 +36,9 @@ const traceContextKey = "grpc-trace-bin"
 func (c *ClientHandler) traceTagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
 	name := strings.TrimPrefix(rti.FullMethodName, "/")
 	name = strings.Replace(name, "/", ".", -1)
-	span := trace.NewSpan(name, trace.FromContext(ctx), trace.StartOptions{
-		Sampler:  c.StartOptions.Sampler,
-		SpanKind: trace.SpanKindClient,
-	}) // span is ended by traceHandleRPC
-	ctx = trace.WithSpan(ctx, span)
+	ctx, span := trace.StartSpan(ctx, name,
+		trace.WithSampler(c.StartOptions.Sampler),
+		trace.WithSpanKind(trace.SpanKindClient)) // span is ended by traceHandleRPC
 	traceContextBinary := propagation.Binary(span.SpanContext())
 	return metadata.AppendToOutgoingContext(ctx, traceContextKey, string(traceContextBinary))
 }
@@ -52,11 +50,6 @@ func (c *ClientHandler) traceTagRPC(ctx context.Context, rti *stats.RPCTagInfo)
 //
 // It returns ctx, with the new trace span added.
 func (s *ServerHandler) traceTagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
-	opts := trace.StartOptions{
-		Sampler:  s.StartOptions.Sampler,
-		SpanKind: trace.SpanKindServer,
-	}
-
 	md, _ := metadata.FromIncomingContext(ctx)
 	name := strings.TrimPrefix(rti.FullMethodName, "/")
 	name = strings.Replace(name, "/", ".", -1)
@@ -72,15 +65,20 @@ func (s *ServerHandler) traceTagRPC(ctx context.Context, rti *stats.RPCTagInfo)
 		traceContextBinary := []byte(traceContext[0])
 		parent, haveParent = propagation.FromBinary(traceContextBinary)
 		if haveParent && !s.IsPublicEndpoint {
-			span := trace.NewSpanWithRemoteParent(name, parent, opts)
-			return trace.WithSpan(ctx, span)
+			ctx, _ := trace.StartSpanWithRemoteParent(ctx, name, parent,
+				trace.WithSpanKind(trace.SpanKindServer),
+				trace.WithSampler(s.StartOptions.Sampler),
+			)
+			return ctx
 		}
 	}
-	span := trace.NewSpan(name, nil, opts)
+	ctx, span := trace.StartSpan(ctx, name,
+		trace.WithSpanKind(trace.SpanKindServer),
+		trace.WithSampler(s.StartOptions.Sampler))
 	if haveParent {
 		span.AddLink(trace.Link{TraceID: parent.TraceID, SpanID: parent.SpanID, Type: trace.LinkTypeChild})
 	}
-	return trace.WithSpan(ctx, span)
+	return ctx
 }
 
 func traceHandleRPC(ctx context.Context, rs stats.RPCStats) {

vendor/go.opencensus.io/plugin/ocgrpc/trace_test.go

@@ -33,7 +33,7 @@ func (t *testExporter) ExportSpan(s *trace.SpanData) {
 }
 
 func TestStreaming(t *testing.T) {
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 	te := testExporter{make(chan *trace.SpanData)}
 	trace.RegisterExporter(&te)
 	defer trace.UnregisterExporter(&te)
@@ -76,7 +76,7 @@ func TestStreaming(t *testing.T) {
 }
 
 func TestStreamingFail(t *testing.T) {
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 	te := testExporter{make(chan *trace.SpanData)}
 	trace.RegisterExporter(&te)
 	defer trace.UnregisterExporter(&te)
@@ -117,7 +117,7 @@ func TestStreamingFail(t *testing.T) {
 }
 
 func TestSingle(t *testing.T) {
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 	te := testExporter{make(chan *trace.SpanData)}
 	trace.RegisterExporter(&te)
 	defer trace.UnregisterExporter(&te)
@@ -150,7 +150,7 @@ func TestServerSpanDuration(t *testing.T) {
 	trace.RegisterExporter(&te)
 	defer trace.UnregisterExporter(&te)
 
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 	ctx := context.Background()
 	const sleep = 100 * time.Millisecond
@@ -174,7 +174,7 @@ loop:
 }
 
 func TestSingleFail(t *testing.T) {
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 	te := testExporter{make(chan *trace.SpanData)}
 	trace.RegisterExporter(&te)
 	defer trace.UnregisterExporter(&te)

vendor/go.opencensus.io/plugin/ochttp/client_test.go

@@ -36,8 +36,8 @@ func TestClient(t *testing.T) {
 	}))
 	defer server.Close()
 
-	for _, v := range ochttp.DefaultClientViews {
-		v.Subscribe()
+	if err := view.Register(ochttp.DefaultClientViews...); err != nil {
+		t.Fatalf("Failed to register ochttp.DefaultClientViews error: %v", err)
 	}
 
 	views := []string{
@@ -54,15 +54,14 @@ func TestClient(t *testing.T) {
 		}
 	}
 
-	var (
-		w    sync.WaitGroup
-		tr   ochttp.Transport
-		errs = make(chan error, reqCount)
-	)
-	w.Add(reqCount)
+	var wg sync.WaitGroup
+	var tr ochttp.Transport
+	errs := make(chan error, reqCount)
+	wg.Add(reqCount)
+
 	for i := 0; i < reqCount; i++ {
 		go func() {
-			defer w.Done()
+			defer wg.Done()
 			req, err := http.NewRequest("POST", server.URL, strings.NewReader("req-body"))
 			if err != nil {
 				errs <- fmt.Errorf("error creating request: %v", err)
@@ -81,7 +80,7 @@ func TestClient(t *testing.T) {
 	}
 
 	go func() {
-		w.Wait()
+		wg.Wait()
 		close(errs)
 	}()
 
@@ -110,7 +109,7 @@ func TestClient(t *testing.T) {
 		var count int64
 		switch data := data.(type) {
 		case *view.CountData:
-			count = *(*int64)(data)
+			count = data.Value
 		case *view.DistributionData:
 			count = data.Count
 		default:

vendor/go.opencensus.io/plugin/ochttp/example_test.go

@@ -25,13 +25,13 @@ import (
 )
 
 func ExampleTransport() {
-	if err := view.Subscribe(
-		// Subscribe to a few default views.
+	if err := view.Register(
+		// Register to a few default views.
 		ochttp.ClientRequestCountByMethod,
 		ochttp.ClientResponseCountByStatusCode,
 		ochttp.ClientLatencyView,
 
-		// Subscribe to a custom view.
+		// Register to a custom view.
 		&view.View{
 			Name:        "httpclient_latency_by_hostpath",
 			TagKeys:     []tag.Key{ochttp.Host, ochttp.Path},

vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go

@@ -15,7 +15,7 @@
 // Package b3 contains a propagation.HTTPFormat implementation
 // for B3 propagation. See https://github.com/openzipkin/b3-propagation
 // for more details.
-package b3
+package b3 // import "go.opencensus.io/plugin/ochttp/propagation/b3"
 
 import (
 	"encoding/hex"

vendor/go.opencensus.io/plugin/ochttp/propagation/tracecontext/propagation.go

@@ -14,7 +14,7 @@
 
 // Package tracecontext contains HTTP propagator for TraceContext standard.
 // See https://github.com/w3c/distributed-tracing for more information.
-package tracecontext
+package tracecontext // import "go.opencensus.io/plugin/ochttp/propagation/tracecontext"
 
 import (
 	"encoding/hex"

vendor/go.opencensus.io/plugin/ochttp/propagation_test.go

@@ -36,7 +36,7 @@ func TestRoundTripAllFormats(t *testing.T) {
 	}
 
 	ctx := context.Background()
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 	ctx, span := trace.StartSpan(ctx, "test")
 	sc := span.SpanContext()
 	wantStr := fmt.Sprintf("trace_id=%x, span_id=%x, options=%d", sc.TraceID, sc.SpanID, sc.TraceOptions)

vendor/go.opencensus.io/plugin/ochttp/server.go

@@ -15,7 +15,10 @@
 package ochttp
 
 import (
+	"bufio"
 	"context"
+	"errors"
+	"net"
 	"net/http"
 	"strconv"
 	"sync"
@@ -65,7 +68,6 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	defer traceEnd()
 	w, statsEnd = h.startStats(w, r)
 	defer statsEnd()
-
 	handler := h.Handler
 	if handler == nil {
 		handler = http.DefaultServeMux
@@ -74,20 +76,19 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *Handler) startTrace(w http.ResponseWriter, r *http.Request) (*http.Request, func()) {
-	opts := trace.StartOptions{
-		Sampler:  h.StartOptions.Sampler,
-		SpanKind: trace.SpanKindServer,
-	}
-
 	name := spanNameFromURL(r.URL)
 	ctx := r.Context()
 	var span *trace.Span
 	sc, ok := h.extractSpanContext(r)
 	if ok && !h.IsPublicEndpoint {
-		span = trace.NewSpanWithRemoteParent(name, sc, opts)
-		ctx = trace.WithSpan(ctx, span)
+		ctx, span = trace.StartSpanWithRemoteParent(ctx, name, sc,
+			trace.WithSampler(h.StartOptions.Sampler),
+			trace.WithSpanKind(trace.SpanKindServer))
 	} else {
-		span = trace.NewSpan(name, nil, opts)
+		ctx, span = trace.StartSpan(ctx, name,
+			trace.WithSampler(h.StartOptions.Sampler),
+			trace.WithSpanKind(trace.SpanKindServer),
+		)
 		if ok {
 			span.AddLink(trace.Link{
 				TraceID:    sc.TraceID,
@@ -97,9 +98,8 @@ func (h *Handler) startTrace(w http.ResponseWriter, r *http.Request) (*http.Requ
 			})
 		}
 	}
-	ctx = trace.WithSpan(ctx, span)
 	span.AddAttributes(requestAttrs(r)...)
-	return r.WithContext(trace.WithSpan(r.Context(), span)), span.End
+	return r.WithContext(ctx), span.End
 }
 
 func (h *Handler) extractSpanContext(r *http.Request) (trace.SpanContext, bool) {
@@ -135,17 +135,33 @@ type trackingResponseWriter struct {
 	respSize   int64
 	start      time.Time
 	statusCode int
+	statusLine string
 	endOnce    sync.Once
 	writer     http.ResponseWriter
 }
 
 var _ http.ResponseWriter = (*trackingResponseWriter)(nil)
+var _ http.Hijacker = (*trackingResponseWriter)(nil)
+
+var errHijackerUnimplemented = errors.New("ResponseWriter does not implement http.Hijacker")
+
+func (t *trackingResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	hj, ok := t.writer.(http.Hijacker)
+	if !ok {
+		return nil, nil, errHijackerUnimplemented
+	}
+	return hj.Hijack()
+}
 
 func (t *trackingResponseWriter) end() {
 	t.endOnce.Do(func() {
 		if t.statusCode == 0 {
 			t.statusCode = 200
 		}
+
+		span := trace.FromContext(t.ctx)
+		span.SetStatus(TraceStatus(t.statusCode, t.statusLine))
+
 		m := []stats.Measurement{
 			ServerLatency.M(float64(time.Since(t.start)) / float64(time.Millisecond)),
 			ServerResponseBytes.M(t.respSize),
@@ -171,6 +187,7 @@ func (t *trackingResponseWriter) Write(data []byte) (int, error) {
 func (t *trackingResponseWriter) WriteHeader(statusCode int) {
 	t.writer.WriteHeader(statusCode)
 	t.statusCode = statusCode
+	t.statusLine = http.StatusText(t.statusCode)
 }
 
 func (t *trackingResponseWriter) Flush() {

vendor/go.opencensus.io/plugin/ochttp/server_test.go

@@ -1,11 +1,22 @@
 package ochttp
 
 import (
+	"bufio"
 	"bytes"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
 	"net/http"
 	"net/http/httptest"
+	"strings"
+	"sync"
 	"testing"
 
+	"golang.org/x/net/http2"
+
 	"go.opencensus.io/stats/view"
 	"go.opencensus.io/trace"
 )
@@ -26,8 +37,8 @@ func updateMean(mean float64, sample, count int) float64 {
 }
 
 func TestHandlerStatsCollection(t *testing.T) {
-	for _, v := range DefaultServerViews {
-		v.Subscribe()
+	if err := view.Register(DefaultServerViews...); err != nil {
+		t.Fatalf("Failed to register ochttp.DefaultServerViews error: %v", err)
 	}
 
 	views := []string{
@@ -90,7 +101,7 @@ func TestHandlerStatsCollection(t *testing.T) {
 		var sum float64
 		switch data := data.(type) {
 		case *view.CountData:
-			count = int(*data)
+			count = int(data.Value)
 		case *view.DistributionData:
 			count = int(data.Count)
 			sum = data.Sum()
@@ -116,3 +127,227 @@ func TestHandlerStatsCollection(t *testing.T) {
 		}
 	}
 }
+
+type testResponseWriterHijacker struct {
+	httptest.ResponseRecorder
+}
+
+func (trw *testResponseWriterHijacker) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	return nil, nil, nil
+}
+
+func TestUnitTestHandlerProxiesHijack(t *testing.T) {
+	tests := []struct {
+		w       http.ResponseWriter
+		wantErr string
+	}{
+		{httptest.NewRecorder(), "ResponseWriter does not implement http.Hijacker"},
+		{nil, "ResponseWriter does not implement http.Hijacker"},
+		{new(testResponseWriterHijacker), ""},
+	}
+
+	for i, tt := range tests {
+		tw := &trackingResponseWriter{writer: tt.w}
+		conn, buf, err := tw.Hijack()
+		if tt.wantErr != "" {
+			if err == nil || !strings.Contains(err.Error(), tt.wantErr) {
+				t.Errorf("#%d got error (%v) want error substring (%q)", i, err, tt.wantErr)
+			}
+			if conn != nil {
+				t.Errorf("#%d inconsistent state got non-nil conn (%v)", i, conn)
+			}
+			if buf != nil {
+				t.Errorf("#%d inconsistent state got non-nil buf (%v)", i, buf)
+			}
+			continue
+		}
+
+		if err != nil {
+			t.Errorf("#%d got unexpected error %v", i, err)
+		}
+	}
+}
+
+// Integration test with net/http to ensure that our Handler proxies to its
+// response the call to (http.Hijack).Hijacker() and that that successfully
+// passes with HTTP/1.1 connections. See Issue #642
+func TestHandlerProxiesHijack_HTTP1(t *testing.T) {
+	cst := httptest.NewServer(&Handler{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			var writeMsg func(string)
+			defer func() {
+				err := recover()
+				writeMsg(fmt.Sprintf("Proto=%s\npanic=%v", r.Proto, err != nil))
+			}()
+			conn, _, _ := w.(http.Hijacker).Hijack()
+			writeMsg = func(msg string) {
+				fmt.Fprintf(conn, "%s 200\nContentLength: %d", r.Proto, len(msg))
+				fmt.Fprintf(conn, "\r\n\r\n%s", msg)
+				conn.Close()
+			}
+		}),
+	})
+	defer cst.Close()
+
+	testCases := []struct {
+		name string
+		tr   *http.Transport
+		want string
+	}{
+		{
+			name: "http1-transport",
+			tr:   new(http.Transport),
+			want: "Proto=HTTP/1.1\npanic=false",
+		},
+		{
+			name: "http2-transport",
+			tr: func() *http.Transport {
+				tr := new(http.Transport)
+				http2.ConfigureTransport(tr)
+				return tr
+			}(),
+			want: "Proto=HTTP/1.1\npanic=false",
+		},
+	}
+
+	for _, tc := range testCases {
+		c := &http.Client{Transport: &Transport{Base: tc.tr}}
+		res, err := c.Get(cst.URL)
+		if err != nil {
+			t.Errorf("(%s) unexpected error %v", tc.name, err)
+			continue
+		}
+		blob, _ := ioutil.ReadAll(res.Body)
+		res.Body.Close()
+		if g, w := string(blob), tc.want; g != w {
+			t.Errorf("(%s) got = %q; want = %q", tc.name, g, w)
+		}
+	}
+}
+
+// Integration test with net/http, x/net/http2 to ensure that our Handler proxies
+// to its response the call to (http.Hijack).Hijacker() and that that crashes
+// since http.Hijacker and HTTP/2.0 connections are incompatible, but the
+// detection is only at runtime and ensure that we can stream and flush to the
+// connection even after invoking Hijack(). See Issue #642.
+func TestHandlerProxiesHijack_HTTP2(t *testing.T) {
+	cst := httptest.NewUnstartedServer(&Handler{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			conn, _, err := w.(http.Hijacker).Hijack()
+			if conn != nil {
+				data := fmt.Sprintf("Surprisingly got the Hijacker() Proto: %s", r.Proto)
+				fmt.Fprintf(conn, "%s 200\nContent-Length:%d\r\n\r\n%s", r.Proto, len(data), data)
+				conn.Close()
+				return
+			}
+
+			switch {
+			case err == nil:
+				fmt.Fprintf(w, "Unexpectedly did not encounter an error!")
+			default:
+				fmt.Fprintf(w, "Unexpected error: %v", err)
+			case strings.Contains(err.(error).Error(), "Hijack"):
+				// Confirmed HTTP/2.0, let's stream to it
+				for i := 0; i < 5; i++ {
+					fmt.Fprintf(w, "%d\n", i)
+					w.(http.Flusher).Flush()
+				}
+			}
+		}),
+	})
+	cst.TLS = &tls.Config{NextProtos: []string{"h2"}}
+	cst.StartTLS()
+	defer cst.Close()
+
+	if wantPrefix := "https://"; !strings.HasPrefix(cst.URL, wantPrefix) {
+		t.Fatalf("URL got = %q wantPrefix = %q", cst.URL, wantPrefix)
+	}
+
+	tr := &http.Transport{TLSClientConfig: &tls.Config{InsecureSkipVerify: true}}
+	http2.ConfigureTransport(tr)
+	c := &http.Client{Transport: tr}
+	res, err := c.Get(cst.URL)
+	if err != nil {
+		t.Fatalf("Unexpected error %v", err)
+	}
+	blob, _ := ioutil.ReadAll(res.Body)
+	res.Body.Close()
+	if g, w := string(blob), "0\n1\n2\n3\n4\n"; g != w {
+		t.Errorf("got = %q; want = %q", g, w)
+	}
+}
+
+func TestEnsureTrackingResponseWriterSetsStatusCode(t *testing.T) {
+	// Ensure that the trackingResponseWriter always sets the spanStatus on ending the span.
+	// Because we can only examine the Status after exporting, this test roundtrips a
+	// couple of requests and then later examines the exported spans.
+	// See Issue #700.
+	exporter := &spanExporter{cur: make(chan *trace.SpanData, 1)}
+	trace.RegisterExporter(exporter)
+	defer trace.UnregisterExporter(exporter)
+
+	tests := []struct {
+		res  *http.Response
+		want trace.Status
+	}{
+		{res: &http.Response{StatusCode: 200}, want: trace.Status{Code: trace.StatusCodeOK, Message: `"OK"`}},
+		{res: &http.Response{StatusCode: 500}, want: trace.Status{Code: trace.StatusCodeUnknown, Message: `"UNKNOWN"`}},
+		{res: &http.Response{StatusCode: 403}, want: trace.Status{Code: trace.StatusCodePermissionDenied, Message: `"PERMISSION_DENIED"`}},
+		{res: &http.Response{StatusCode: 401}, want: trace.Status{Code: trace.StatusCodeUnauthenticated, Message: `"UNAUTHENTICATED"`}},
+		{res: &http.Response{StatusCode: 429}, want: trace.Status{Code: trace.StatusCodeResourceExhausted, Message: `"RESOURCE_EXHAUSTED"`}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.want.Message, func(t *testing.T) {
+			span := trace.NewSpan("testing", nil, trace.StartOptions{Sampler: trace.AlwaysSample()})
+			ctx := trace.WithSpan(context.Background(), span)
+			prc, pwc := io.Pipe()
+			go func() {
+				pwc.Write([]byte("Foo"))
+				pwc.Close()
+			}()
+			inRes := tt.res
+			inRes.Body = prc
+			tr := &traceTransport{base: &testResponseTransport{res: inRes}}
+			req, err := http.NewRequest("POST", "https://example.org", bytes.NewReader([]byte("testing")))
+			if err != nil {
+				t.Fatalf("NewRequest error: %v", err)
+			}
+			req = req.WithContext(ctx)
+			res, err := tr.RoundTrip(req)
+			if err != nil {
+				t.Fatalf("RoundTrip error: %v", err)
+			}
+			_, _ = ioutil.ReadAll(res.Body)
+			res.Body.Close()
+
+			cur := <-exporter.cur
+			if got, want := cur.Status, tt.want; got != want {
+				t.Fatalf("SpanData:\ngot =  (%#v)\nwant = (%#v)", got, want)
+			}
+		})
+	}
+}
+
+type spanExporter struct {
+	sync.Mutex
+	cur chan *trace.SpanData
+}
+
+var _ trace.Exporter = (*spanExporter)(nil)
+
+func (se *spanExporter) ExportSpan(sd *trace.SpanData) {
+	se.Lock()
+	se.cur <- sd
+	se.Unlock()
+}
+
+type testResponseTransport struct {
+	res *http.Response
+}
+
+var _ http.RoundTripper = (*testResponseTransport)(nil)
+
+func (rb *testResponseTransport) RoundTrip(*http.Request) (*http.Response, error) {
+	return rb.res, nil
+}

vendor/go.opencensus.io/plugin/ochttp/stats.go

@@ -22,18 +22,18 @@ import (
 
 // The following client HTTP measures are supported for use in custom views.
 var (
-	ClientRequestCount, _  = stats.Int64("opencensus.io/http/client/request_count", "Number of HTTP requests started", stats.UnitNone)
-	ClientRequestBytes, _  = stats.Int64("opencensus.io/http/client/request_bytes", "HTTP request body size if set as ContentLength (uncompressed)", stats.UnitBytes)
-	ClientResponseBytes, _ = stats.Int64("opencensus.io/http/client/response_bytes", "HTTP response body size (uncompressed)", stats.UnitBytes)
-	ClientLatency, _       = stats.Float64("opencensus.io/http/client/latency", "End-to-end latency", stats.UnitMilliseconds)
+	ClientRequestCount  = stats.Int64("opencensus.io/http/client/request_count", "Number of HTTP requests started", stats.UnitDimensionless)
+	ClientRequestBytes  = stats.Int64("opencensus.io/http/client/request_bytes", "HTTP request body size if set as ContentLength (uncompressed)", stats.UnitBytes)
+	ClientResponseBytes = stats.Int64("opencensus.io/http/client/response_bytes", "HTTP response body size (uncompressed)", stats.UnitBytes)
+	ClientLatency       = stats.Float64("opencensus.io/http/client/latency", "End-to-end latency", stats.UnitMilliseconds)
 )
 
 // The following server HTTP measures are supported for use in custom views:
 var (
-	ServerRequestCount, _  = stats.Int64("opencensus.io/http/server/request_count", "Number of HTTP requests started", stats.UnitNone)
-	ServerRequestBytes, _  = stats.Int64("opencensus.io/http/server/request_bytes", "HTTP request body size if set as ContentLength (uncompressed)", stats.UnitBytes)
-	ServerResponseBytes, _ = stats.Int64("opencensus.io/http/server/response_bytes", "HTTP response body size (uncompressed)", stats.UnitBytes)
-	ServerLatency, _       = stats.Float64("opencensus.io/http/server/latency", "End-to-end latency", stats.UnitMilliseconds)
+	ServerRequestCount  = stats.Int64("opencensus.io/http/server/request_count", "Number of HTTP requests started", stats.UnitDimensionless)
+	ServerRequestBytes  = stats.Int64("opencensus.io/http/server/request_bytes", "HTTP request body size if set as ContentLength (uncompressed)", stats.UnitBytes)
+	ServerResponseBytes = stats.Int64("opencensus.io/http/server/response_bytes", "HTTP response body size (uncompressed)", stats.UnitBytes)
+	ServerLatency       = stats.Float64("opencensus.io/http/server/latency", "End-to-end latency", stats.UnitMilliseconds)
 )
 
 // The following tags are applied to stats recorded by this package. Host, Path

vendor/go.opencensus.io/plugin/ochttp/trace.go

@@ -53,10 +53,11 @@ func (t *traceTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	name := spanNameFromURL(req.URL)
 	// TODO(jbd): Discuss whether we want to prefix
 	// outgoing requests with Sent.
-	parent := trace.FromContext(req.Context())
-	span := trace.NewSpan(name, parent, t.startOptions)
-	req = req.WithContext(trace.WithSpan(req.Context(), span))
+	_, span := trace.StartSpan(req.Context(), name,
+		trace.WithSampler(t.startOptions.Sampler),
+		trace.WithSpanKind(trace.SpanKindClient))
 
+	req = req.WithContext(trace.WithSpan(req.Context(), span))
 	if t.format != nil {
 		t.format.SpanContextToRequest(span.SpanContext(), req)
 	}
@@ -64,13 +65,13 @@ func (t *traceTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	span.AddAttributes(requestAttrs(req)...)
 	resp, err := t.base.RoundTrip(req)
 	if err != nil {
-		span.SetStatus(trace.Status{Code: 2, Message: err.Error()})
+		span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
 		span.End()
 		return resp, err
 	}
 
 	span.AddAttributes(responseAttrs(resp)...)
-	span.SetStatus(status(resp.StatusCode))
+	span.SetStatus(TraceStatus(resp.StatusCode, resp.Status))
 
 	// span.End() will be invoked after
 	// a read from resp.Body returns io.EOF or when
@@ -145,71 +146,54 @@ func responseAttrs(resp *http.Response) []trace.Attribute {
 	}
 }
 
-func status(statusCode int) trace.Status {
+// HTTPStatusToTraceStatus converts the HTTP status code to a trace.Status that
+// represents the outcome as closely as possible.
+func TraceStatus(httpStatusCode int, statusLine string) trace.Status {
 	var code int32
-	if statusCode < 200 || statusCode >= 400 {
-		code = codeUnknown
+	if httpStatusCode < 200 || httpStatusCode >= 400 {
+		code = trace.StatusCodeUnknown
 	}
-	switch statusCode {
+	switch httpStatusCode {
 	case 499:
-		code = codeCancelled
+		code = trace.StatusCodeCancelled
 	case http.StatusBadRequest:
-		code = codeInvalidArgument
+		code = trace.StatusCodeInvalidArgument
 	case http.StatusGatewayTimeout:
-		code = codeDeadlineExceeded
+		code = trace.StatusCodeDeadlineExceeded
 	case http.StatusNotFound:
-		code = codeNotFound
+		code = trace.StatusCodeNotFound
 	case http.StatusForbidden:
-		code = codePermissionDenied
+		code = trace.StatusCodePermissionDenied
 	case http.StatusUnauthorized: // 401 is actually unauthenticated.
-		code = codeUnathenticated
+		code = trace.StatusCodeUnauthenticated
 	case http.StatusTooManyRequests:
-		code = codeResourceExhausted
+		code = trace.StatusCodeResourceExhausted
 	case http.StatusNotImplemented:
-		code = codeUnimplemented
+		code = trace.StatusCodeUnimplemented
 	case http.StatusServiceUnavailable:
-		code = codeUnavailable
+		code = trace.StatusCodeUnavailable
+	case http.StatusOK:
+		code = trace.StatusCodeOK
 	}
 	return trace.Status{Code: code, Message: codeToStr[code]}
 }
 
-// TODO(jbd): Provide status codes from trace package.
-const (
-	codeOK                 = 0
-	codeCancelled          = 1
-	codeUnknown            = 2
-	codeInvalidArgument    = 3
-	codeDeadlineExceeded   = 4
-	codeNotFound           = 5
-	codeAlreadyExists      = 6
-	codePermissionDenied   = 7
-	codeResourceExhausted  = 8
-	codeFailedPrecondition = 9
-	codeAborted            = 10
-	codeOutOfRange         = 11
-	codeUnimplemented      = 12
-	codeInternal           = 13
-	codeUnavailable        = 14
-	codeDataLoss           = 15
-	codeUnathenticated     = 16
-)
-
 var codeToStr = map[int32]string{
-	codeOK:                 `"OK"`,
-	codeCancelled:          `"CANCELLED"`,
-	codeUnknown:            `"UNKNOWN"`,
-	codeInvalidArgument:    `"INVALID_ARGUMENT"`,
-	codeDeadlineExceeded:   `"DEADLINE_EXCEEDED"`,
-	codeNotFound:           `"NOT_FOUND"`,
-	codeAlreadyExists:      `"ALREADY_EXISTS"`,
-	codePermissionDenied:   `"PERMISSION_DENIED"`,
-	codeResourceExhausted:  `"RESOURCE_EXHAUSTED"`,
-	codeFailedPrecondition: `"FAILED_PRECONDITION"`,
-	codeAborted:            `"ABORTED"`,
-	codeOutOfRange:         `"OUT_OF_RANGE"`,
-	codeUnimplemented:      `"UNIMPLEMENTED"`,
-	codeInternal:           `"INTERNAL"`,
-	codeUnavailable:        `"UNAVAILABLE"`,
-	codeDataLoss:           `"DATA_LOSS"`,
-	codeUnathenticated:     `"UNAUTHENTICATED"`,
+	trace.StatusCodeOK:                 `"OK"`,
+	trace.StatusCodeCancelled:          `"CANCELLED"`,
+	trace.StatusCodeUnknown:            `"UNKNOWN"`,
+	trace.StatusCodeInvalidArgument:    `"INVALID_ARGUMENT"`,
+	trace.StatusCodeDeadlineExceeded:   `"DEADLINE_EXCEEDED"`,
+	trace.StatusCodeNotFound:           `"NOT_FOUND"`,
+	trace.StatusCodeAlreadyExists:      `"ALREADY_EXISTS"`,
+	trace.StatusCodePermissionDenied:   `"PERMISSION_DENIED"`,
+	trace.StatusCodeResourceExhausted:  `"RESOURCE_EXHAUSTED"`,
+	trace.StatusCodeFailedPrecondition: `"FAILED_PRECONDITION"`,
+	trace.StatusCodeAborted:            `"ABORTED"`,
+	trace.StatusCodeOutOfRange:         `"OUT_OF_RANGE"`,
+	trace.StatusCodeUnimplemented:      `"UNIMPLEMENTED"`,
+	trace.StatusCodeInternal:           `"INTERNAL"`,
+	trace.StatusCodeUnavailable:        `"UNAVAILABLE"`,
+	trace.StatusCodeDataLoss:           `"DATA_LOSS"`,
+	trace.StatusCodeUnauthenticated:    `"UNAUTHENTICATED"`,
 }

vendor/go.opencensus.io/plugin/ochttp/trace_test.go

@@ -73,7 +73,8 @@ func (t testPropagator) SpanContextToRequest(sc trace.SpanContext, req *http.Req
 }
 
 func TestTransport_RoundTrip(t *testing.T) {
-	parent := trace.NewSpan("parent", nil, trace.StartOptions{})
+	ctx := context.Background()
+	ctx, parent := trace.StartSpan(ctx, "parent")
 	tests := []struct {
 		name   string
 		parent *trace.Span
@@ -172,7 +173,7 @@ func (c *collector) ExportSpan(s *trace.SpanData) {
 }
 
 func TestEndToEnd(t *testing.T) {
-	trace.SetDefaultSampler(trace.AlwaysSample())
+	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 	tc := []struct {
 		name            string
@@ -221,12 +222,9 @@ func TestEndToEnd(t *testing.T) {
 			url := serveHTTP(tt.handler, serverDone, serverReturn)
 
 			// Start a root Span in the client.
-			root := trace.NewSpan(
-				"top-level",
-				nil,
-				trace.StartOptions{})
-			ctx := trace.WithSpan(context.Background(), root)
-
+			ctx, root := trace.StartSpan(
+				context.Background(),
+				"top-level")
 			// Make the request.
 			req, err := http.NewRequest(
 				http.MethodPost,
@@ -278,7 +276,7 @@ func TestEndToEnd(t *testing.T) {
 						t.Errorf("Span name: %q; want %q", got, want)
 					}
 				default:
-					t.Fatalf("server or client span missing")
+					t.Fatalf("server or client span missing; kind = %v", sp.SpanKind)
 				}
 			}
 
@@ -439,19 +437,20 @@ func TestStatusUnitTest(t *testing.T) {
 		in   int
 		want trace.Status
 	}{
-		{200, trace.Status{Code: 0, Message: `"OK"`}},
-		{100, trace.Status{Code: 2, Message: `"UNKNOWN"`}},
-		{500, trace.Status{Code: 2, Message: `"UNKNOWN"`}},
-		{404, trace.Status{Code: 5, Message: `"NOT_FOUND"`}},
-		{600, trace.Status{Code: 2, Message: `"UNKNOWN"`}},
-		{401, trace.Status{Code: 16, Message: `"UNAUTHENTICATED"`}},
-		{403, trace.Status{Code: 7, Message: `"PERMISSION_DENIED"`}},
-		{301, trace.Status{Code: 0, Message: `"OK"`}},
-		{501, trace.Status{Code: 12, Message: `"UNIMPLEMENTED"`}},
+		{200, trace.Status{Code: trace.StatusCodeOK, Message: `"OK"`}},
+		{204, trace.Status{Code: trace.StatusCodeOK, Message: `"OK"`}},
+		{100, trace.Status{Code: trace.StatusCodeUnknown, Message: `"UNKNOWN"`}},
+		{500, trace.Status{Code: trace.StatusCodeUnknown, Message: `"UNKNOWN"`}},
+		{404, trace.Status{Code: trace.StatusCodeNotFound, Message: `"NOT_FOUND"`}},
+		{600, trace.Status{Code: trace.StatusCodeUnknown, Message: `"UNKNOWN"`}},
+		{401, trace.Status{Code: trace.StatusCodeUnauthenticated, Message: `"UNAUTHENTICATED"`}},
+		{403, trace.Status{Code: trace.StatusCodePermissionDenied, Message: `"PERMISSION_DENIED"`}},
+		{301, trace.Status{Code: trace.StatusCodeOK, Message: `"OK"`}},
+		{501, trace.Status{Code: trace.StatusCodeUnimplemented, Message: `"UNIMPLEMENTED"`}},
 	}
 
 	for _, tt := range tests {
-		got, want := status(tt.in), tt.want
+		got, want := TraceStatus(tt.in, ""), tt.want
 		if got != want {
 			t.Errorf("status(%d) got = (%#v) want = (%#v)", tt.in, got, want)
 		}

vendor/go.opencensus.io/stats/benchmark_test.go

@@ -16,7 +16,6 @@ package stats_test
 
 import (
 	"context"
-	"log"
 	"testing"
 
 	"go.opencensus.io/stats"
@@ -93,9 +92,5 @@ func BenchmarkRecord8_8Tags(b *testing.B) {
 }
 
 func makeMeasure() *stats.Int64Measure {
-	m, err := stats.Int64("m", "test measure", "")
-	if err != nil {
-		log.Fatal(err)
-	}
-	return m
+	return stats.Int64("m", "test measure", "")
 }

vendor/go.opencensus.io/stats/example_test.go

@@ -16,16 +16,16 @@ package stats_test
 
 import (
 	"context"
-	"log"
 
 	"go.opencensus.io/stats"
 )
 
 func ExampleRecord() {
 	ctx := context.Background()
-	openConns, err := stats.Int64("my.org/measure/openconns", "open connections", stats.UnitNone)
-	if err != nil {
-		log.Fatal(err)
-	}
+
+	// Measures are usually declared as package-private global variables.
+	openConns := stats.Int64("my.org/measure/openconns", "open connections", stats.UnitDimensionless)
+
+	// Instrumented packages call stats.Record() to record measuremens.
 	stats.Record(ctx, openConns.M(124)) // Record 124 open connections.
 }

vendor/go.opencensus.io/stats/internal/validation.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package internal
+package internal // import "go.opencensus.io/stats/internal"
 
 const (
 	MaxNameLength = 255

vendor/go.opencensus.io/stats/measure.go

@@ -16,12 +16,8 @@
 package stats
 
 import (
-	"errors"
-	"fmt"
 	"sync"
 	"sync/atomic"
-
-	"go.opencensus.io/stats/internal"
 )
 
 // Measure represents a type of metric to be tracked and recorded.
@@ -38,12 +34,13 @@ type Measure interface {
 	Name() string
 	Description() string
 	Unit() string
-
-	subscribe()
-	subscribed() bool
 }
 
-type measure struct {
+// measureDescriptor is the untyped descriptor associated with each measure.
+// Int64Measure and Float64Measure wrap measureDescriptor to provide typed
+// recording APIs.
+// Two Measures with the same name will have the same measureDescriptor.
+type measureDescriptor struct {
 	subs int32 // access atomically
 
 	name        string
@@ -51,56 +48,33 @@ type measure struct {
 	unit        string
 }
 
-func (m *measure) subscribe() {
+func (m *measureDescriptor) subscribe() {
 	atomic.StoreInt32(&m.subs, 1)
 }
 
-func (m *measure) subscribed() bool {
+func (m *measureDescriptor) subscribed() bool {
 	return atomic.LoadInt32(&m.subs) == 1
 }
 
-// Name returns the name of the measure.
-func (m *measure) Name() string {
-	return m.name
-}
-
-// Description returns the description of the measure.
-func (m *measure) Description() string {
-	return m.description
-}
-
-// Unit returns the unit of the measure.
-func (m *measure) Unit() string {
-	return m.unit
-}
-
 var (
 	mu       sync.RWMutex
-	measures = make(map[string]Measure)
+	measures = make(map[string]*measureDescriptor)
 )
 
-var (
-	errDuplicate          = errors.New("duplicate measure name")
-	errMeasureNameTooLong = fmt.Errorf("measure name cannot be longer than %v", internal.MaxNameLength)
-)
-
-// FindMeasure finds the Measure instance, if any, associated with the given name.
-func FindMeasure(name string) Measure {
-	mu.RLock()
-	m := measures[name]
-	mu.RUnlock()
-	return m
-}
-
-func register(m Measure) (Measure, error) {
-	key := m.Name()
+func registerMeasureHandle(name, desc, unit string) *measureDescriptor {
 	mu.Lock()
 	defer mu.Unlock()
-	if stored, ok := measures[key]; ok {
-		return stored, errDuplicate
+
+	if stored, ok := measures[name]; ok {
+		return stored
 	}
-	measures[key] = m
-	return m, nil
+	m := &measureDescriptor{
+		name:        name,
+		description: desc,
+		unit:        unit,
+	}
+	measures[name] = m
+	return m
 }
 
 // Measurement is the numeric value measured when recording stats. Each measure
@@ -120,13 +94,3 @@ func (m Measurement) Value() float64 {
 func (m Measurement) Measure() Measure {
 	return m.m
 }
-
-func checkName(name string) error {
-	if len(name) > internal.MaxNameLength {
-		return errMeasureNameTooLong
-	}
-	if !internal.IsPrintable(name) {
-		return errors.New("measure name needs to be an ASCII string")
-	}
-	return nil
-}

vendor/go.opencensus.io/stats/measure_float64.go

@@ -17,41 +17,36 @@ package stats
 
 // Float64Measure is a measure of type float64.
 type Float64Measure struct {
-	measure
+	md *measureDescriptor
 }
 
-func (m *Float64Measure) subscribe() {
-	m.measure.subscribe()
+// Name returns the name of the measure.
+func (m *Float64Measure) Name() string {
+	return m.md.name
 }
 
-func (m *Float64Measure) subscribed() bool {
-	return m.measure.subscribed()
+// Description returns the description of the measure.
+func (m *Float64Measure) Description() string {
+	return m.md.description
+}
+
+// Unit returns the unit of the measure.
+func (m *Float64Measure) Unit() string {
+	return m.md.unit
 }
 
 // M creates a new float64 measurement.
 // Use Record to record measurements.
 func (m *Float64Measure) M(v float64) Measurement {
-	if !m.subscribed() {
+	if !m.md.subscribed() {
 		return Measurement{}
 	}
 	return Measurement{m: m, v: v}
 }
 
-// Float64 creates a new measure of type Float64Measure. It returns
-// an error if a measure with the same name already exists.
-func Float64(name, description, unit string) (*Float64Measure, error) {
-	if err := checkName(name); err != nil {
-		return nil, err
-	}
-	m := &Float64Measure{
-		measure: measure{
-			name:        name,
-			description: description,
-			unit:        unit,
-		},
-	}
-	if _, err := register(m); err != nil {
-		return nil, err
-	}
-	return m, nil
+// Float64 creates a new measure of type Float64Measure.
+// It never returns an error.
+func Float64(name, description, unit string) *Float64Measure {
+	mi := registerMeasureHandle(name, description, unit)
+	return &Float64Measure{mi}
 }

vendor/go.opencensus.io/stats/measure_int64.go

@@ -17,41 +17,36 @@ package stats
 
 // Int64Measure is a measure of type int64.
 type Int64Measure struct {
-	measure
+	md *measureDescriptor
 }
 
-func (m *Int64Measure) subscribe() {
-	m.measure.subscribe()
+// Name returns the name of the measure.
+func (m *Int64Measure) Name() string {
+	return m.md.name
 }
 
-func (m *Int64Measure) subscribed() bool {
-	return m.measure.subscribed()
+// Description returns the description of the measure.
+func (m *Int64Measure) Description() string {
+	return m.md.description
+}
+
+// Unit returns the unit of the measure.
+func (m *Int64Measure) Unit() string {
+	return m.md.unit
 }
 
 // M creates a new int64 measurement.
 // Use Record to record measurements.
 func (m *Int64Measure) M(v int64) Measurement {
-	if !m.subscribed() {
+	if !m.md.subscribed() {
 		return Measurement{}
 	}
 	return Measurement{m: m, v: float64(v)}
 }
 
-// Int64 creates a new measure of type Int64Measure. It returns an
-// error if a measure with the same name already exists.
-func Int64(name, description, unit string) (*Int64Measure, error) {
-	if err := checkName(name); err != nil {
-		return nil, err
-	}
-	m := &Int64Measure{
-		measure: measure{
-			name:        name,
-			description: description,
-			unit:        unit,
-		},
-	}
-	if _, err := register(m); err != nil {
-		return nil, err
-	}
-	return m, nil
+// Int64 creates a new measure of type Int64Measure.
+// It never returns an error.
+func Int64(name, description, unit string) *Int64Measure {
+	mi := registerMeasureHandle(name, description, unit)
+	return &Int64Measure{mi}
 }

vendor/go.opencensus.io/stats/measure_test.go

@@ -1,108 +0,0 @@
-package stats
-
-import (
-	"strings"
-	"testing"
-)
-
-func TestCheckMeasureName(t *testing.T) {
-	tests := []struct {
-		name    string
-		view    string
-		wantErr bool
-	}{
-		{
-			name:    "valid measure name",
-			view:    "my.org/measures/response_size",
-			wantErr: false,
-		},
-		{
-			name:    "long name",
-			view:    strings.Repeat("a", 256),
-			wantErr: true,
-		},
-		{
-			name:    "name with non-ASCII",
-			view:    "my.org/measures/\007",
-			wantErr: true,
-		},
-		{
-			name:    "no emoji for you!",
-			view:    "💩",
-			wantErr: true,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if err := checkName(tt.view); (err != nil) != tt.wantErr {
-				t.Errorf("checkName() error = %v, wantErr %v", err, tt.wantErr)
-			}
-		})
-	}
-}
-
-func Test_FindMeasure(t *testing.T) {
-	mf1, err := Float64("MF1", "desc MF1", "unit")
-	if err != nil {
-		t.Errorf("stats.Float64(\"MF1\", \"desc MF1\") got error %v, want no error", err)
-	}
-	mf2, err := Float64("MF2", "desc MF2", "unit")
-	if err != nil {
-		t.Errorf("stats.Float64(\"MF2\", \"desc MF2\") got error %v, want no error", err)
-	}
-	mi1, err := Int64("MI1", "desc MI1", "unit")
-	if err != nil {
-		t.Errorf("stats.Int64(\"MI1\", \"desc MI1\") got error %v, want no error", err)
-	}
-
-	type testCase struct {
-		label string
-		name  string
-		m     Measure
-	}
-
-	tcs := []testCase{
-		{
-			"0",
-			mf1.Name(),
-			mf1,
-		},
-		{
-			"1",
-			"MF1",
-			mf1,
-		},
-		{
-			"2",
-			mf2.Name(),
-			mf2,
-		},
-		{
-			"3",
-			"MF2",
-			mf2,
-		},
-		{
-			"4",
-			mi1.Name(),
-			mi1,
-		},
-		{
-			"5",
-			"MI1",
-			mi1,
-		},
-		{
-			"6",
-			"other",
-			nil,
-		},
-	}
-
-	for _, tc := range tcs {
-		m := FindMeasure(tc.name)
-		if m != tc.m {
-			t.Errorf("FindMeasure(%q) got measure %v; want %v", tc.label, m, tc.m)
-		}
-	}
-}

vendor/go.opencensus.io/stats/units.go

@@ -18,7 +18,8 @@ package stats
 // Units are encoded according to the case-sensitive abbreviations from the
 // Unified Code for Units of Measure: http://unitsofmeasure.org/ucum.html
 const (
-	UnitNone         = "1"
-	UnitBytes        = "By"
-	UnitMilliseconds = "ms"
+	UnitNone          = "1" // Deprecated: Use UnitDimensionless.
+	UnitDimensionless = "1"
+	UnitBytes         = "By"
+	UnitMilliseconds  = "ms"
 )

vendor/go.opencensus.io/stats/view/aggregation.go

@@ -15,21 +15,32 @@
 
 package view
 
-//go:generate stringer -type AggType
-
 // AggType represents the type of aggregation function used on a View.
 type AggType int
 
+// All available aggregation types.
 const (
 	AggTypeNone         AggType = iota // no aggregation; reserved for future use.
 	AggTypeCount                       // the count aggregation, see Count.
 	AggTypeSum                         // the sum aggregation, see Sum.
-	AggTypeMean                        // the mean aggregation, see Mean.
 	AggTypeDistribution                // the distribution aggregation, see Distribution.
+	AggTypeLastValue                   // the last value aggregation, see LastValue.
 )
 
+func (t AggType) String() string {
+	return aggTypeName[t]
+}
+
+var aggTypeName = map[AggType]string{
+	AggTypeNone:         "None",
+	AggTypeCount:        "Count",
+	AggTypeSum:          "Sum",
+	AggTypeDistribution: "Distribution",
+	AggTypeLastValue:    "LastValue",
+}
+
 // Aggregation represents a data aggregation method. Use one of the functions:
-// Count, Sum, Mean, or Distribution to construct an Aggregation.
+// Count, Sum, or Distribution to construct an Aggregation.
 type Aggregation struct {
 	Type    AggType   // Type is the AggType of this Aggregation.
 	Buckets []float64 // Buckets are the bucket endpoints if this Aggregation represents a distribution, see Distribution.
@@ -41,19 +52,13 @@ var (
 	aggCount = &Aggregation{
 		Type: AggTypeCount,
 		newData: func() AggregationData {
-			return newCountData(0)
+			return &CountData{}
 		},
 	}
 	aggSum = &Aggregation{
 		Type: AggTypeSum,
 		newData: func() AggregationData {
-			return newSumData(0)
-		},
-	}
-	aggMean = &Aggregation{
-		Type: AggTypeMean,
-		newData: func() AggregationData {
-			return newMeanData(0, 0)
+			return &SumData{}
 		},
 	}
 )
@@ -74,14 +79,6 @@ func Sum() *Aggregation {
 	return aggSum
 }
 
-// Mean indicates that collect and aggregate data and maintain
-// the mean value.
-// For example, average latency in milliseconds can be aggregated by using
-// Mean, although in most cases it is preferable to use a Distribution.
-func Mean() *Aggregation {
-	return aggMean
-}
-
 // Distribution indicates that the desired aggregation is
 // a histogram distribution.
 //
@@ -110,3 +107,14 @@ func Distribution(bounds ...float64) *Aggregation {
 		},
 	}
 }
+
+// LastValue only reports the last value recorded using this
+// aggregation. All other measurements will be dropped.
+func LastValue() *Aggregation {
+	return &Aggregation{
+		Type: AggTypeLastValue,
+		newData: func() AggregationData {
+			return &LastValueData{}
+		},
+	}
+}

vendor/go.opencensus.io/stats/view/aggregation_data.go

@@ -35,21 +35,18 @@ const epsilon = 1e-9
 // A count aggregation processes data and counts the recordings.
 //
 // Most users won't directly access count data.
-type CountData int64
-
-func newCountData(v int64) *CountData {
-	tmp := CountData(v)
-	return &tmp
+type CountData struct {
+	Value int64
 }
 
 func (a *CountData) isAggregationData() bool { return true }
 
-func (a *CountData) addSample(_ float64) {
-	*a = *a + 1
+func (a *CountData) addSample(v float64) {
+	a.Value = a.Value + 1
 }
 
 func (a *CountData) clone() AggregationData {
-	return newCountData(int64(*a))
+	return &CountData{Value: a.Value}
 }
 
 func (a *CountData) equal(other AggregationData) bool {
@@ -58,28 +55,25 @@ func (a *CountData) equal(other AggregationData) bool {
 		return false
 	}
 
-	return int64(*a) == int64(*a2)
+	return a.Value == a2.Value
 }
 
 // SumData is the aggregated data for the Sum aggregation.
 // A sum aggregation processes data and sums up the recordings.
 //
 // Most users won't directly access sum data.
-type SumData float64
-
-func newSumData(v float64) *SumData {
-	tmp := SumData(v)
-	return &tmp
+type SumData struct {
+	Value float64
 }
 
 func (a *SumData) isAggregationData() bool { return true }
 
 func (a *SumData) addSample(f float64) {
-	*a += SumData(f)
+	a.Value += f
 }
 
 func (a *SumData) clone() AggregationData {
-	return newSumData(float64(*a))
+	return &SumData{Value: a.Value}
 }
 
 func (a *SumData) equal(other AggregationData) bool {
@@ -87,49 +81,7 @@ func (a *SumData) equal(other AggregationData) bool {
 	if !ok {
 		return false
 	}
-	return math.Pow(float64(*a)-float64(*a2), 2) < epsilon
-}
-
-// MeanData is the aggregated data for the Mean aggregation.
-// A mean aggregation processes data and maintains the mean value.
-//
-// Most users won't directly access mean data.
-type MeanData struct {
-	Count int64   // number of data points aggregated
-	Mean  float64 // mean of all data points
-}
-
-func newMeanData(mean float64, count int64) *MeanData {
-	return &MeanData{
-		Mean:  mean,
-		Count: count,
-	}
-}
-
-// Sum returns the sum of all samples collected.
-func (a *MeanData) Sum() float64 { return a.Mean * float64(a.Count) }
-
-func (a *MeanData) isAggregationData() bool { return true }
-
-func (a *MeanData) addSample(f float64) {
-	a.Count++
-	if a.Count == 1 {
-		a.Mean = f
-		return
-	}
-	a.Mean = a.Mean + (f-a.Mean)/float64(a.Count)
-}
-
-func (a *MeanData) clone() AggregationData {
-	return newMeanData(a.Mean, a.Count)
-}
-
-func (a *MeanData) equal(other AggregationData) bool {
-	a2, ok := other.(*MeanData)
-	if !ok {
-		return false
-	}
-	return a.Count == a2.Count && math.Pow(a.Mean-a2.Mean, 2) < epsilon
+	return math.Pow(a.Value-a2.Value, 2) < epsilon
 }
 
 // DistributionData is the aggregated data for the
@@ -228,3 +180,28 @@ func (a *DistributionData) equal(other AggregationData) bool {
 	}
 	return a.Count == a2.Count && a.Min == a2.Min && a.Max == a2.Max && math.Pow(a.Mean-a2.Mean, 2) < epsilon && math.Pow(a.variance()-a2.variance(), 2) < epsilon
 }
+
+// LastValueData returns the last value recorded for LastValue aggregation.
+type LastValueData struct {
+	Value float64
+}
+
+func (l *LastValueData) isAggregationData() bool {
+	return true
+}
+
+func (l *LastValueData) addSample(v float64) {
+	l.Value = v
+}
+
+func (l *LastValueData) clone() AggregationData {
+	return &LastValueData{l.Value}
+}
+
+func (l *LastValueData) equal(other AggregationData) bool {
+	a2, ok := other.(*LastValueData)
+	if !ok {
+		return false
+	}
+	return l.Value == a2.Value
+}

vendor/go.opencensus.io/stats/view/aggregation_data_test.go

@@ -35,19 +35,15 @@ func TestDataClone(t *testing.T) {
 	}{
 		{
 			name: "count data",
-			src:  newCountData(5),
+			src:  &CountData{Value: 5},
 		},
 		{
 			name: "distribution data",
 			src:  dist,
 		},
-		{
-			name: "mean data",
-			src:  newMeanData(11.0, 5),
-		},
 		{
 			name: "sum data",
-			src:  newSumData(65.7),
+			src:  &SumData{Value: 65.7},
 		},
 	}
 	for _, tt := range tests {

vendor/go.opencensus.io/stats/view/aggtype_string.go

@@ -1,16 +0,0 @@
-// Code generated by "stringer -type AggType"; DO NOT EDIT.
-
-package view
-
-import "strconv"
-
-const _AggType_name = "AggTypeNoneAggTypeCountAggTypeSumAggTypeMeanAggTypeDistribution"
-
-var _AggType_index = [...]uint8{0, 11, 23, 33, 44, 63}
-
-func (i AggType) String() string {
-	if i < 0 || i >= AggType(len(_AggType_index)-1) {
-		return "AggType(" + strconv.FormatInt(int64(i), 10) + ")"
-	}
-	return _AggType_name[_AggType_index[i]:_AggType_index[i+1]]
-}

vendor/go.opencensus.io/stats/view/benchmark_test.go

@@ -25,7 +25,7 @@ import (
 )
 
 var (
-	m, _  = stats.Float64("m", "", "")
+	m     = stats.Float64("m", "", "")
 	k1, _ = tag.NewKey("k1")
 	k2, _ = tag.NewKey("k2")
 	k3, _ = tag.NewKey("k3")
@@ -46,9 +46,9 @@ var (
 func BenchmarkRecordReqCommand(b *testing.B) {
 	w := newWorker()
 
-	subscribe := &subscribeToViewReq{views: []*View{view}, err: make(chan error, 1)}
-	subscribe.handleCommand(w)
-	if err := <-subscribe.err; err != nil {
+	register := &registerViewReq{views: []*View{view}, err: make(chan error, 1)}
+	register.handleCommand(w)
+	if err := <-register.err; err != nil {
 		b.Fatal(err)
 	}
 

vendor/go.opencensus.io/stats/view/doc.go

@@ -21,11 +21,10 @@ A view allows recorded measurements to be filtered and aggregated over a time wi
 
 All recorded measurements can be filtered by a list of tags.
 
-OpenCensus provides several aggregation methods: count, distribution, sum and mean.
+OpenCensus provides several aggregation methods: count, distribution and sum.
 Count aggregation only counts the number of measurement points. Distribution
 aggregation provides statistical summary of the aggregated data. Sum distribution
-sums up the measurement points. Mean provides the mean of the recorded measurements.
-Aggregations can either happen cumulatively or over an interval.
+sums up the measurement points. Aggregations are cumulative.
 
 Users can dynamically create and delete views.
 

vendor/go.opencensus.io/stats/view/example_test.go

@@ -22,9 +22,11 @@ import (
 )
 
 func Example() {
-	m, _ := stats.Int64("my.org/measure/openconns", "open connections", "")
+	// Measures are usually declared and used by instrumented packages.
+	m := stats.Int64("my.org/measure/openconns", "open connections", stats.UnitDimensionless)
 
-	if err := view.Subscribe(&view.View{
+	// Views are usually subscribed in your application main function.
+	if err := view.Register(&view.View{
 		Name:        "my.org/views/openconns",
 		Description: "open connections",
 		Measure:     m,

vendor/go.opencensus.io/stats/view/view.go

@@ -46,20 +46,6 @@ type View struct {
 	Aggregation *Aggregation
 }
 
-// Deprecated: Use &View{}.
-func New(name, description string, keys []tag.Key, measure stats.Measure, agg *Aggregation) (*View, error) {
-	if measure == nil {
-		panic("measure may not be nil")
-	}
-	return &View{
-		Name:        name,
-		Description: description,
-		TagKeys:     keys,
-		Measure:     measure,
-		Aggregation: agg,
-	}, nil
-}
-
 // WithName returns a copy of the View with a new name. This is useful for
 // renaming views to cope with limitations placed on metric names by various
 // backends.
@@ -176,7 +162,7 @@ func (r *Row) String() string {
 	return buffer.String()
 }
 
-// same returns true if both Rows are equal. Tags are expected to be ordered
+// Equal returns true if both rows are equal. Tags are expected to be ordered
 // by the key name. Even both rows have the same tags but the tags appear in
 // different orders it will return false.
 func (r *Row) Equal(other *Row) bool {

vendor/go.opencensus.io/stats/view/view_measure_test.go

@@ -0,0 +1,50 @@
+package view
+
+import (
+	"context"
+	"testing"
+
+	"go.opencensus.io/stats"
+)
+
+func TestMeasureFloat64AndInt64(t *testing.T) {
+	// Recording through both a Float64Measure and Int64Measure with the
+	// same name should work.
+
+	im := stats.Int64("TestMeasureFloat64AndInt64", "", stats.UnitDimensionless)
+	fm := stats.Float64("TestMeasureFloat64AndInt64", "", stats.UnitDimensionless)
+
+	if im == nil || fm == nil {
+		t.Fatal("Error creating Measures")
+	}
+
+	v1 := &View{
+		Name:        "TestMeasureFloat64AndInt64/v1",
+		Measure:     im,
+		Aggregation: Sum(),
+	}
+	v2 := &View{
+		Name:        "TestMeasureFloat64AndInt64/v2",
+		Measure:     fm,
+		Aggregation: Sum(),
+	}
+	Register(v1, v2)
+
+	stats.Record(context.Background(), im.M(5))
+	stats.Record(context.Background(), fm.M(2.2))
+
+	d1, _ := RetrieveData(v1.Name)
+	d2, _ := RetrieveData(v2.Name)
+
+	sum1 := d1[0].Data.(*SumData)
+	sum2 := d2[0].Data.(*SumData)
+
+	// We expect both views to return 7.2, as though we recorded on a single measure.
+
+	if got, want := sum1.Value, 7.2; got != want {
+		t.Errorf("sum1 = %v; want %v", got, want)
+	}
+	if got, want := sum2.Value, 7.2; got != want {
+		t.Errorf("sum2 = %v; want %v", got, want)
+	}
+}

vendor/go.opencensus.io/stats/view/view_test.go

@@ -28,7 +28,7 @@ func Test_View_MeasureFloat64_AggregationDistribution(t *testing.T) {
 	k2, _ := tag.NewKey("k2")
 	k3, _ := tag.NewKey("k3")
 	agg1 := Distribution(2)
-	m, _ := stats.Int64("Test_View_MeasureFloat64_AggregationDistribution/m1", "", stats.UnitNone)
+	m := stats.Int64("Test_View_MeasureFloat64_AggregationDistribution/m1", "", stats.UnitDimensionless)
 	view1 := &View{
 		TagKeys:     []tag.Key{k1, k2},
 		Measure:     m,
@@ -197,7 +197,7 @@ func Test_View_MeasureFloat64_AggregationSum(t *testing.T) {
 	k1, _ := tag.NewKey("k1")
 	k2, _ := tag.NewKey("k2")
 	k3, _ := tag.NewKey("k3")
-	m, _ := stats.Int64("Test_View_MeasureFloat64_AggregationSum/m1", "", stats.UnitNone)
+	m := stats.Int64("Test_View_MeasureFloat64_AggregationSum/m1", "", stats.UnitDimensionless)
 	view, err := newViewInternal(&View{TagKeys: []tag.Key{k1, k2}, Measure: m, Aggregation: Sum()})
 	if err != nil {
 		t.Fatal(err)
@@ -226,7 +226,7 @@ func Test_View_MeasureFloat64_AggregationSum(t *testing.T) {
 			[]*Row{
 				{
 					[]tag.Tag{{Key: k1, Value: "v1"}},
-					newSumData(6),
+					&SumData{Value: 6},
 				},
 			},
 		},
@@ -239,11 +239,11 @@ func Test_View_MeasureFloat64_AggregationSum(t *testing.T) {
 			[]*Row{
 				{
 					[]tag.Tag{{Key: k1, Value: "v1"}},
-					newSumData(1),
+					&SumData{Value: 1},
 				},
 				{
 					[]tag.Tag{{Key: k2, Value: "v2"}},
-					newSumData(5),
+					&SumData{Value: 5},
 				},
 			},
 		},
@@ -259,19 +259,19 @@ func Test_View_MeasureFloat64_AggregationSum(t *testing.T) {
 			[]*Row{
 				{
 					[]tag.Tag{{Key: k1, Value: "v1"}},
-					newSumData(6),
+					&SumData{Value: 6},
 				},
 				{
 					[]tag.Tag{{Key: k1, Value: "v1 other"}},
-					newSumData(1),
+					&SumData{Value: 1},
 				},
 				{
 					[]tag.Tag{{Key: k2, Value: "v2"}},
-					newSumData(5),
+					&SumData{Value: 5},
 				},
 				{
 					[]tag.Tag{{Key: k1, Value: "v1"}, {Key: k2, Value: "v2"}},
-					newSumData(5),
+					&SumData{Value: 5},
 				},
 			},
 		},
@@ -312,8 +312,8 @@ func Test_View_MeasureFloat64_AggregationSum(t *testing.T) {
 func TestCanonicalize(t *testing.T) {
 	k1, _ := tag.NewKey("k1")
 	k2, _ := tag.NewKey("k2")
-	m, _ := stats.Int64("TestCanonicalize/m1", "desc desc", stats.UnitNone)
-	v := &View{TagKeys: []tag.Key{k2, k1}, Measure: m, Aggregation: Mean()}
+	m := stats.Int64("TestCanonicalize/m1", "desc desc", stats.UnitDimensionless)
+	v := &View{TagKeys: []tag.Key{k2, k1}, Measure: m, Aggregation: Sum()}
 	err := v.canonicalize()
 	if err != nil {
 		t.Fatal(err)
@@ -332,138 +332,19 @@ func TestCanonicalize(t *testing.T) {
 	}
 }
 
-func Test_View_MeasureFloat64_AggregationMean(t *testing.T) {
-	k1, _ := tag.NewKey("k1")
-	k2, _ := tag.NewKey("k2")
-	k3, _ := tag.NewKey("k3")
-	m, _ := stats.Int64("Test_View_MeasureFloat64_AggregationMean/m1", "", stats.UnitNone)
-	viewDesc := &View{TagKeys: []tag.Key{k1, k2}, Measure: m, Aggregation: Mean()}
-	view, err := newViewInternal(viewDesc)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	type tagString struct {
-		k tag.Key
-		v string
-	}
-	type record struct {
-		f    float64
-		tags []tagString
-	}
-
-	tcs := []struct {
-		label    string
-		records  []record
-		wantRows []*Row
-	}{
-		{
-			"1",
-			[]record{
-				{1, []tagString{{k1, "v1"}}},
-				{5, []tagString{{k1, "v1"}}},
-			},
-			[]*Row{
-				{
-					[]tag.Tag{{Key: k1, Value: "v1"}},
-					newMeanData(3, 2),
-				},
-			},
-		},
-		{
-			"2",
-			[]record{
-				{1, []tagString{{k1, "v1"}}},
-				{5, []tagString{{k2, "v2"}}},
-				{-0.5, []tagString{{k2, "v2"}}},
-			},
-			[]*Row{
-				{
-					[]tag.Tag{{Key: k1, Value: "v1"}},
-					newMeanData(1, 1),
-				},
-				{
-					[]tag.Tag{{Key: k2, Value: "v2"}},
-					newMeanData(2.25, 2),
-				},
-			},
-		},
-		{
-			"3",
-			[]record{
-				{1, []tagString{{k1, "v1"}}},
-				{5, []tagString{{k1, "v1"}, {k3, "v3"}}},
-				{1, []tagString{{k1, "v1 other"}}},
-				{5, []tagString{{k2, "v2"}}},
-				{5, []tagString{{k1, "v1"}, {k2, "v2"}}},
-				{-4, []tagString{{k1, "v1"}, {k2, "v2"}}},
-			},
-			[]*Row{
-				{
-					[]tag.Tag{{Key: k1, Value: "v1"}},
-					newMeanData(3, 2),
-				},
-				{
-					[]tag.Tag{{Key: k1, Value: "v1 other"}},
-					newMeanData(1, 1),
-				},
-				{
-					[]tag.Tag{{Key: k2, Value: "v2"}},
-					newMeanData(5, 1),
-				},
-				{
-					[]tag.Tag{{Key: k1, Value: "v1"}, {Key: k2, Value: "v2"}},
-					newMeanData(0.5, 2),
-				},
-			},
-		},
-	}
-
-	for _, tt := range tcs {
-		view.clearRows()
-		view.subscribe()
-		for _, r := range tt.records {
-			mods := []tag.Mutator{}
-			for _, t := range r.tags {
-				mods = append(mods, tag.Insert(t.k, t.v))
-			}
-			ctx, err := tag.New(context.Background(), mods...)
-			if err != nil {
-				t.Errorf("%v: New = %v", tt.label, err)
-			}
-			view.addSample(tag.FromContext(ctx), r.f)
-		}
-
-		gotRows := view.collectedRows()
-		for i, got := range gotRows {
-			if !containsRow(tt.wantRows, got) {
-				t.Errorf("%v-%d: got row %v; want none", tt.label, i, got)
-				break
-			}
-		}
-
-		for i, want := range tt.wantRows {
-			if !containsRow(gotRows, want) {
-				t.Errorf("%v-%d: got none; want row %v", tt.label, i, want)
-				break
-			}
-		}
-	}
-}
-
 func TestViewSortedKeys(t *testing.T) {
 	k1, _ := tag.NewKey("a")
 	k2, _ := tag.NewKey("b")
 	k3, _ := tag.NewKey("c")
 	ks := []tag.Key{k1, k3, k2}
 
-	m, _ := stats.Int64("TestViewSortedKeys/m1", "", stats.UnitNone)
-	Subscribe(&View{
+	m := stats.Int64("TestViewSortedKeys/m1", "", stats.UnitDimensionless)
+	Register(&View{
 		Name:        "sort_keys",
 		Description: "desc sort_keys",
 		TagKeys:     ks,
 		Measure:     m,
-		Aggregation: Mean(),
+		Aggregation: Sum(),
 	})
 	// Subscribe normalizes the view by sorting the tag keys, retrieve the normalized view
 	v := Find("sort_keys")
@@ -490,3 +371,31 @@ func containsRow(rows []*Row, r *Row) bool {
 	}
 	return false
 }
+
+func TestRegisterUnregisterParity(t *testing.T) {
+	measures := []stats.Measure{
+		stats.Int64("ifoo", "iFOO", "iBar"),
+		stats.Float64("ffoo", "fFOO", "fBar"),
+	}
+	aggregations := []*Aggregation{
+		Count(),
+		Sum(),
+		Distribution(1, 2.0, 4.0, 8.0, 16.0),
+	}
+
+	for i := 0; i < 10; i++ {
+		for _, m := range measures {
+			for _, agg := range aggregations {
+				v := &View{
+					Aggregation: agg,
+					Name:        "Lookup here",
+					Measure:     m,
+				}
+				if err := Register(v); err != nil {
+					t.Errorf("Iteration #%d:\nMeasure: (%#v)\nAggregation (%#v)\nError: %v", i, m, agg, err)
+				}
+				Unregister(v)
+			}
+		}
+	}
+}

vendor/go.opencensus.io/stats/view/worker.go

@@ -61,30 +61,15 @@ func Find(name string) (v *View) {
 	return resp.v
 }
 
-// Deprecated: Registering is a no-op. Use the Subscribe function.
-func Register(_ *View) error {
-	return nil
-}
-
-// Deprecated: Unregistering is a no-op, see: Unsubscribe.
-func Unregister(_ *View) error {
-	return nil
-}
-
-// Deprecated: Use the Subscribe function.
-func (v *View) Subscribe() error {
-	return Subscribe(v)
-}
-
-// Subscribe begins collecting data for the given views.
+// Register begins collecting data for the given views.
 // Once a view is subscribed, it reports data to the registered exporters.
-func Subscribe(views ...*View) error {
+func Register(views ...*View) error {
 	for _, v := range views {
 		if err := v.canonicalize(); err != nil {
 			return err
 		}
 	}
-	req := &subscribeToViewReq{
+	req := &registerViewReq{
 		views: views,
 		err:   make(chan error),
 	}
@@ -92,16 +77,16 @@ func Subscribe(views ...*View) error {
 	return <-req.err
 }
 
-// Unsubscribe the given views. Data will not longer be exported for these views
-// after Unsubscribe returns.
-// It is not necessary to unsubscribe from views you expect to collect for the
+// Unregister the given views. Data will not longer be exported for these views
+// after Unregister returns.
+// It is not necessary to unregister from views you expect to collect for the
 // duration of your program execution.
-func Unsubscribe(views ...*View) {
+func Unregister(views ...*View) {
 	names := make([]string, len(views))
 	for i := range views {
 		names[i] = views[i].Name
 	}
-	req := &unsubscribeFromViewReq{
+	req := &unregisterFromViewReq{
 		views: names,
 		done:  make(chan struct{}),
 	}
@@ -109,15 +94,6 @@ func Unsubscribe(views ...*View) {
 	<-req.done
 }
 
-// Deprecated: Use the Unsubscribe function instead.
-func (v *View) Unsubscribe() error {
-	if v == nil {
-		return nil
-	}
-	Unsubscribe(v)
-	return nil
-}
-
 func RetrieveData(viewName string) ([]*Row, error) {
 	req := &retrieveDataReq{
 		now: time.Now(),

vendor/go.opencensus.io/stats/view/worker_commands.go

@@ -41,16 +41,21 @@ type getViewByNameResp struct {
 }
 
 func (cmd *getViewByNameReq) handleCommand(w *worker) {
-	cmd.c <- &getViewByNameResp{w.views[cmd.name].view}
+	v := w.views[cmd.name]
+	if v == nil {
+		cmd.c <- &getViewByNameResp{nil}
+		return
+	}
+	cmd.c <- &getViewByNameResp{v.view}
 }
 
-// subscribeToViewReq is the command to subscribe to a view.
-type subscribeToViewReq struct {
+// registerViewReq is the command to register a view.
+type registerViewReq struct {
 	views []*View
 	err   chan error
 }
 
-func (cmd *subscribeToViewReq) handleCommand(w *worker) {
+func (cmd *registerViewReq) handleCommand(w *worker) {
 	var errstr []string
 	for _, view := range cmd.views {
 		vi, err := w.tryRegisterView(view)
@@ -68,15 +73,15 @@ func (cmd *subscribeToViewReq) handleCommand(w *worker) {
 	}
 }
 
-// unsubscribeFromViewReq is the command to unsubscribe to a view. Has no
+// unregisterFromViewReq is the command to unsubscribe to a view. Has no
 // impact on the data collection for client that are pulling data from the
 // library.
-type unsubscribeFromViewReq struct {
+type unregisterFromViewReq struct {
 	views []string
 	done  chan struct{}
 }
 
-func (cmd *unsubscribeFromViewReq) handleCommand(w *worker) {
+func (cmd *unregisterFromViewReq) handleCommand(w *worker) {
 	for _, name := range cmd.views {
 		vi, ok := w.views[name]
 		if !ok {
@@ -89,6 +94,7 @@ func (cmd *unsubscribeFromViewReq) handleCommand(w *worker) {
 			// The collected data can be cleared.
 			vi.clearRows()
 		}
+		delete(w.views, name)
 	}
 	cmd.done <- struct{}{}
 }

vendor/go.opencensus.io/stats/view/worker_test.go

@@ -26,56 +26,24 @@ import (
 	"go.opencensus.io/tag"
 )
 
-func Test_Worker_MeasureCreation(t *testing.T) {
-	restart()
-
-	if _, err := stats.Float64("MF1", "desc MF1", "unit"); err != nil {
-		t.Errorf("stats.Float64(\"MF1\", \"desc MF1\") got error %v, want no error", err)
-	}
-
-	if _, err := stats.Float64("MF1", "Duplicate measure with same name as MF1.", "unit"); err == nil {
-		t.Error("stats.Float64(\"MF1\", \"Duplicate Float64Measure with same name as MF1.\") got no error, want no error")
-	}
-
-	if _, err := stats.Int64("MF1", "Duplicate measure with same name as MF1.", "unit"); err == nil {
-		t.Error("stats.Int64(\"MF1\", \"Duplicate Int64Measure with same name as MF1.\") got no error, want no error")
-	}
-
-	if _, err := stats.Float64("MF2", "desc MF2", "unit"); err != nil {
-		t.Errorf("stats.Float64(\"MF2\", \"desc MF2\") got error %v, want no error", err)
-	}
-
-	if _, err := stats.Int64("MI1", "desc MI1", "unit"); err != nil {
-		t.Errorf("stats.Int64(\"MI1\", \"desc MI1\") got error %v, want no error", err)
-	}
-
-	if _, err := stats.Int64("MI1", "Duplicate measure with same name as MI1.", "unit"); err == nil {
-		t.Error("stats.Int64(\"MI1\", \"Duplicate Int64 with same name as MI1.\") got no error, want no error")
-	}
-
-	if _, err := stats.Float64("MI1", "Duplicate measure with same name as MI1.", "unit"); err == nil {
-		t.Error("stats.Float64(\"MI1\", \"Duplicate Float64 with same name as MI1.\") got no error, want no error")
-	}
-}
-
-func Test_Worker_ViewSubscription(t *testing.T) {
+func Test_Worker_ViewRegistration(t *testing.T) {
 	someError := errors.New("some error")
 
 	sc1 := make(chan *Data)
 
-	type subscription struct {
+	type registration struct {
 		c   chan *Data
 		vID string
 		err error
 	}
 	type testCase struct {
 		label         string
-		subscriptions []subscription
+		registrations []registration
 	}
 	tcs := []testCase{
 		{
 			"register and subscribe to v1ID",
-			[]subscription{
+			[]registration{
 				{
 					sc1,
 					"v1ID",
@@ -85,7 +53,7 @@ func Test_Worker_ViewSubscription(t *testing.T) {
 		},
 		{
 			"register v1ID+v2ID, susbsribe to v1ID",
-			[]subscription{
+			[]registration{
 				{
 					sc1,
 					"v1ID",
@@ -95,7 +63,7 @@ func Test_Worker_ViewSubscription(t *testing.T) {
 		},
 		{
 			"register to v1ID; subscribe to v1ID and view with same ID",
-			[]subscription{
+			[]registration{
 				{
 					sc1,
 					"v1ID",
@@ -110,8 +78,8 @@ func Test_Worker_ViewSubscription(t *testing.T) {
 		},
 	}
 
-	mf1, _ := stats.Float64("MF1/Test_Worker_ViewSubscription", "desc MF1", "unit")
-	mf2, _ := stats.Float64("MF2/Test_Worker_ViewSubscription", "desc MF2", "unit")
+	mf1 := stats.Float64("MF1/Test_Worker_ViewSubscription", "desc MF1", "unit")
+	mf2 := stats.Float64("MF2/Test_Worker_ViewSubscription", "desc MF2", "unit")
 
 	for _, tc := range tcs {
 		t.Run(tc.label, func(t *testing.T) {
@@ -137,11 +105,11 @@ func Test_Worker_ViewSubscription(t *testing.T) {
 				"vNilID": nil,
 			}
 
-			for _, s := range tc.subscriptions {
-				v := views[s.vID]
-				err := Subscribe(v)
-				if (err != nil) != (s.err != nil) {
-					t.Errorf("%v: Subscribe() = %v, want %v", tc.label, err, s.err)
+			for _, r := range tc.registrations {
+				v := views[r.vID]
+				err := Register(v)
+				if (err != nil) != (r.err != nil) {
+					t.Errorf("%v: Register() = %v, want %v", tc.label, err, r.err)
 				}
 			}
 		})
@@ -152,10 +120,7 @@ func Test_Worker_RecordFloat64(t *testing.T) {
 	restart()
 
 	someError := errors.New("some error")
-	m, err := stats.Float64("Test_Worker_RecordFloat64/MF1", "desc MF1", "unit")
-	if err != nil {
-		t.Errorf("stats.Float64(\"MF1\", \"desc MF1\") got error '%v', want no error", err)
-	}
+	m := stats.Float64("Test_Worker_RecordFloat64/MF1", "desc MF1", "unit")
 
 	k1, _ := tag.NewKey("k1")
 	k2, _ := tag.NewKey("k2")
@@ -178,31 +143,28 @@ func Test_Worker_RecordFloat64(t *testing.T) {
 	type testCase struct {
 		label         string
 		registrations []*View
-		subscriptions []*View
 		records       []float64
 		wants         []want
 	}
 
 	tcs := []testCase{
 		{
-			"0",
-			[]*View{v1, v2},
-			[]*View{},
-			[]float64{1, 1},
-			[]want{{v1, nil, someError}, {v2, nil, someError}},
+			label:         "0",
+			registrations: []*View{},
+			records:       []float64{1, 1},
+			wants:         []want{{v1, nil, someError}, {v2, nil, someError}},
 		},
 		{
-			"1",
-			[]*View{v1, v2},
-			[]*View{v1},
-			[]float64{1, 1},
-			[]want{
+			label:         "1",
+			registrations: []*View{v1},
+			records:       []float64{1, 1},
+			wants: []want{
 				{
 					v1,
 					[]*Row{
 						{
 							[]tag.Tag{{Key: k1, Value: "v1"}, {Key: k2, Value: "v2"}},
-							newCountData(2),
+							&CountData{Value: 2},
 						},
 					},
 					nil,
@@ -211,17 +173,16 @@ func Test_Worker_RecordFloat64(t *testing.T) {
 			},
 		},
 		{
-			"2",
-			[]*View{v1, v2},
-			[]*View{v1, v2},
-			[]float64{1, 1},
-			[]want{
+			label:         "2",
+			registrations: []*View{v1, v2},
+			records:       []float64{1, 1},
+			wants: []want{
 				{
 					v1,
 					[]*Row{
 						{
 							[]tag.Tag{{Key: k1, Value: "v1"}, {Key: k2, Value: "v2"}},
-							newCountData(2),
+							&CountData{Value: 2},
 						},
 					},
 					nil,
@@ -231,7 +192,7 @@ func Test_Worker_RecordFloat64(t *testing.T) {
 					[]*Row{
 						{
 							[]tag.Tag{{Key: k1, Value: "v1"}, {Key: k2, Value: "v2"}},
-							newCountData(2),
+							&CountData{Value: 2},
 						},
 					},
 					nil,
@@ -247,12 +208,6 @@ func Test_Worker_RecordFloat64(t *testing.T) {
 			}
 		}
 
-		for _, v := range tc.subscriptions {
-			if err := v.Subscribe(); err != nil {
-				t.Fatalf("%v: Subscribe(%v) = %v; want no errors", tc.label, v.Name, err)
-			}
-		}
-
 		for _, value := range tc.records {
 			stats.Record(ctx, m.M(value))
 		}
@@ -260,44 +215,31 @@ func Test_Worker_RecordFloat64(t *testing.T) {
 		for _, w := range tc.wants {
 			gotRows, err := RetrieveData(w.v.Name)
 			if (err != nil) != (w.err != nil) {
-				t.Fatalf("%v: RetrieveData(%v) = %v; want no errors", tc.label, w.v.Name, err)
+				t.Fatalf("%s: RetrieveData(%v) = %v; want error = %v", tc.label, w.v.Name, err, w.err)
 			}
 			for _, got := range gotRows {
 				if !containsRow(w.rows, got) {
-					t.Errorf("%v: got row %v; want none", tc.label, got)
+					t.Errorf("%s: got row %#v; want none", tc.label, got)
 					break
 				}
 			}
 			for _, want := range w.rows {
 				if !containsRow(gotRows, want) {
-					t.Errorf("%v: got none; want %v'", tc.label, want)
+					t.Errorf("%s: got none; want %#v'", tc.label, want)
 					break
 				}
 			}
 		}
 
-		// cleaning up
-		for _, v := range tc.subscriptions {
-			if err := v.Unsubscribe(); err != nil {
-				t.Fatalf("%v: Unsubscribing from view %v errored with %v; want no error", tc.label, v.Name, err)
-			}
-		}
-
-		for _, v := range tc.registrations {
-			if err := Unregister(v); err != nil {
-				t.Fatalf("%v: Unregistering view %v errrored with %v; want no error", tc.label, v.Name, err)
-			}
-		}
+		// Cleaning up.
+		Unregister(tc.registrations...)
 	}
 }
 
 func TestReportUsage(t *testing.T) {
 	ctx := context.Background()
 
-	m, err := stats.Int64("measure", "desc", "unit")
-	if err != nil {
-		t.Fatalf("stats.Int64() = %v", err)
-	}
+	m := stats.Int64("measure", "desc", "unit")
 
 	tests := []struct {
 		name         string
@@ -320,8 +262,7 @@ func TestReportUsage(t *testing.T) {
 		restart()
 		SetReportingPeriod(25 * time.Millisecond)
 
-		err = Subscribe(tt.view)
-		if err != nil {
+		if err := Register(tt.view); err != nil {
 			t.Fatalf("%v: cannot subscribe: %v", tt.name, err)
 		}
 
@@ -374,15 +315,16 @@ func TestWorkerStarttime(t *testing.T) {
 	restart()
 
 	ctx := context.Background()
-	m, err := stats.Int64("measure/TestWorkerStarttime", "desc", "unit")
-	if err != nil {
-		t.Fatalf("stats.Int64() = %v", err)
+	m := stats.Int64("measure/TestWorkerStarttime", "desc", "unit")
+	v := &View{
+		Name:        "testview",
+		Measure:     m,
+		Aggregation: Count(),
 	}
-	v, _ := New("testview", "", nil, m, Count())
 
 	SetReportingPeriod(25 * time.Millisecond)
-	if err := v.Subscribe(); err != nil {
-		t.Fatalf("cannot subscribe to %v: %v", v.Name, err)
+	if err := Register(v); err != nil {
+		t.Fatalf("cannot register to %v: %v", v.Name, err)
 	}
 
 	e := &vdExporter{}
@@ -433,7 +375,7 @@ func (e *countExporter) ExportView(vd *Data) {
 
 	e.Lock()
 	defer e.Unlock()
-	e.count = int64(*d)
+	e.count = d.Value
 }
 
 type vdExporter struct {

vendor/go.opencensus.io/trace/basetypes.go

@@ -22,6 +22,7 @@ import (
 type (
 	// TraceID is a 16-byte identifier for a set of spans.
 	TraceID [16]byte
+
 	// SpanID is an 8-byte identifier for a single span.
 	SpanID [8]byte
 )

vendor/go.opencensus.io/trace/benchmark_test.go

@@ -94,12 +94,12 @@ func BenchmarkSpanID_DotString(b *testing.B) {
 func traceBenchmark(b *testing.B, fn func(*testing.B)) {
 	b.Run("AlwaysSample", func(b *testing.B) {
 		b.ReportAllocs()
-		SetDefaultSampler(AlwaysSample())
+		ApplyConfig(Config{DefaultSampler: AlwaysSample()})
 		fn(b)
 	})
 	b.Run("NeverSample", func(b *testing.B) {
 		b.ReportAllocs()
-		SetDefaultSampler(NeverSample())
+		ApplyConfig(Config{DefaultSampler: NeverSample()})
 		fn(b)
 	})
 }

vendor/go.opencensus.io/trace/config.go

@@ -0,0 +1,40 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import "go.opencensus.io/trace/internal"
+
+// Config represents the global tracing configuration.
+type Config struct {
+	// DefaultSampler is the default sampler used when creating new spans.
+	DefaultSampler Sampler
+
+	// IDGenerator is for internal use only.
+	IDGenerator internal.IDGenerator
+}
+
+// ApplyConfig applies changes to the global tracing configuration.
+//
+// Fields not provided in the given config are going to be preserved.
+func ApplyConfig(cfg Config) {
+	c := config.Load().(*Config)
+	if cfg.DefaultSampler != nil {
+		c.DefaultSampler = cfg.DefaultSampler
+	}
+	if cfg.IDGenerator != nil {
+		c.IDGenerator = cfg.IDGenerator
+	}
+	config.Store(c)
+}

vendor/go.opencensus.io/trace/config_test.go

@@ -0,0 +1,33 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestApplyZeroConfig(t *testing.T) {
+	cfg := config.Load().(*Config)
+	ApplyConfig(Config{})
+	currentCfg := config.Load().(*Config)
+
+	if got, want := reflect.ValueOf(currentCfg.DefaultSampler).Pointer(), reflect.ValueOf(cfg.DefaultSampler).Pointer(); got != want {
+		t.Fatalf("config.DefaultSampler = %#v; want %#v", got, want)
+	}
+	if got, want := currentCfg.IDGenerator, cfg.IDGenerator; got != want {
+		t.Fatalf("config.IDGenerator = %#v; want %#v", got, want)
+	}
+}

vendor/go.opencensus.io/trace/doc.go

@@ -13,25 +13,24 @@
 // limitations under the License.
 
 /*
-Package trace contains types for representing trace information, and
-functions for global configuration of tracing.
+Package trace contains support for OpenCensus distributed tracing.
 
 The following assumes a basic familiarity with OpenCensus concepts.
-See http://opencensus.io.
+See http://opencensus.io
 
 
-Enabling Tracing for a Program
+Exporting Traces
 
-To use OpenCensus tracing, register at least one Exporter. You can use
+To export collected tracing data, register at least one exporter. You can use
 one of the provided exporters or write your own.
 
-    trace.RegisterExporter(anExporter)
+    trace.RegisterExporter(exporter)
 
 By default, traces will be sampled relatively rarely. To change the sampling
-frequency for your entire program, call SetDefaultSampler. Use a ProbabilitySampler
+frequency for your entire program, call ApplyConfig. Use a ProbabilitySampler
 to sample a subset of traces, or use AlwaysSample to collect a trace on every run:
 
-    trace.SetDefaultSampler(trace.AlwaysSample())
+    trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
 
 
 Adding Spans to a Trace
@@ -43,13 +42,10 @@ It is common to want to capture all the activity of a function call in a span. F
 this to work, the function must take a context.Context as a parameter. Add these two
 lines to the top of the function:
 
-    ctx, span := trace.StartSpan(ctx, "your choice of name")
+    ctx, span := trace.StartSpan(ctx, "my.org/Run")
     defer span.End()
 
 StartSpan will create a new top-level span if the context
 doesn't contain another span, otherwise it will create a child span.
-
-As a suggestion, use the fully-qualified function name as the span name, e.g.
-"github.com/me/mypackage.Run".
 */
 package trace // import "go.opencensus.io/trace"

vendor/go.opencensus.io/trace/internal/internal.go

@@ -0,0 +1,21 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package internal provides trace internals.
+package internal
+
+type IDGenerator interface {
+	NewTraceID() [16]byte
+	NewSpanID() [8]byte
+}