HTTP trigger http-stream tests (#1241)

Gopkg.lock

@@ -2,23 +2,18 @@
 
 
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@@ -48,53 +43,41 @@
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@@ -118,129 +101,101 @@
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@@ -248,220 +203,174 @@
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@@ -479,23 +388,19 @@
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@@ -504,32 +409,26 @@
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@@ -545,38 +444,30 @@
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@@ -603,83 +494,26 @@
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   version = "v8.18.2"
 
 [[projects]]
-  digest = "1:f0620375dd1f6251d9973b5f2596228cc8042e887cd7f827e4220bc1ce8c30e2"
   name = "gopkg.in/yaml.v2"
   packages = ["."]
-  pruneopts = ""
   revision = "5420a8b6744d3b0345ab293f6fcba19c978f1183"
   version = "v2.2.1"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  input-imports = [
+  inputs-digest = "caf9da7776a8bba243fa98193ff57c7fff65abe07019dd4115c228ae54f19770"
-    "github.com/aws/aws-sdk-go/aws",
-    "github.com/aws/aws-sdk-go/aws/awserr",
-    "github.com/aws/aws-sdk-go/aws/credentials",
-    "github.com/aws/aws-sdk-go/aws/session",
-    "github.com/aws/aws-sdk-go/service/s3",
-    "github.com/aws/aws-sdk-go/service/s3/s3manager",
-    "github.com/boltdb/bolt",
-    "github.com/coreos/go-semver/semver",
-    "github.com/dchest/siphash",
-    "github.com/fnproject/fdk-go",
-    "github.com/fnproject/fdk-go/utils",
-    "github.com/fsnotify/fsnotify",
-    "github.com/fsouza/go-dockerclient",
-    "github.com/garyburd/redigo/redis",
-    "github.com/gin-contrib/cors",
-    "github.com/gin-gonic/gin",
-    "github.com/go-sql-driver/mysql",
-    "github.com/golang/protobuf/proto",
-    "github.com/golang/protobuf/ptypes/empty",
-    "github.com/google/btree",
-    "github.com/grpc-ecosystem/go-grpc-middleware",
-    "github.com/jmoiron/sqlx",
-    "github.com/leanovate/gopter",
-    "github.com/leanovate/gopter/gen",
-    "github.com/leanovate/gopter/prop",
-    "github.com/lib/pq",
-    "github.com/mattn/go-sqlite3",
-    "github.com/openzipkin/zipkin-go/reporter/http",
-    "github.com/patrickmn/go-cache",
-    "github.com/prometheus/client_golang/prometheus",
-    "github.com/sirupsen/logrus",
-    "github.com/sirupsen/logrus/hooks/syslog",
-    "go.opencensus.io/exporter/jaeger",
-    "go.opencensus.io/exporter/prometheus",
-    "go.opencensus.io/exporter/zipkin",
-    "go.opencensus.io/plugin/ochttp",
-    "go.opencensus.io/plugin/ochttp/propagation/b3",
-    "go.opencensus.io/stats",
-    "go.opencensus.io/stats/view",
-    "go.opencensus.io/tag",
-    "go.opencensus.io/trace",
-    "golang.org/x/net/context",
-    "golang.org/x/net/trace",
-    "golang.org/x/sys/unix",
-    "golang.org/x/time/rate",
-    "google.golang.org/grpc",
-    "google.golang.org/grpc/codes",
-    "google.golang.org/grpc/credentials",
-    "google.golang.org/grpc/metadata",
-    "google.golang.org/grpc/peer",
-    "google.golang.org/grpc/status",
-  ]
   solver-name = "gps-cdcl"
   solver-version = 1

Makefile

@@ -130,7 +130,12 @@ docker-test:
 	-v ${CURDIR}:/go/src/github.com/fnproject/fn \
 	-w /go/src/github.com/fnproject/fn \
 	fnproject/go:dev go test \
-	-v $(shell docker run --rm -ti -v ${CURDIR}:/go/src/github.com/fnproject/fn -w /go/src/github.com/fnproject/fn -e GOPATH=/go golang:alpine sh -c 'go list ./... | grep -v vendor | grep -v examples | grep -v tool | grep -v fn')
+	-v $(shell docker run --rm -ti -v ${CURDIR}:/go/src/github.com/fnproject/fn -w /go/src/github.com/fnproject/fn -e GOPATH=/go golang:alpine sh -c 'go list ./... | \
+                                                                                                                                                          grep -v vendor | \
+                                                                                                                                                          grep -v examples | \
+                                                                                                                                                          grep -v test/fn-api-tests | \
+                                                                                                                                                          grep -v test/fn-system-tests | \
+                                                                                                                                                          grep -v images/fn-test-utils')
 
 .PHONY: all
 all: dep generate build

api/agent/agent.go

@@ -755,13 +755,18 @@ func (s *hotSlot) dispatch(ctx context.Context, call *call) chan error {
 	}
 
 	go func() {
+		// TODO it's possible we can get rid of this (after getting rid of logs API) - may need for call id/debug mode still
+		// TODO there's a timeout race for swapping this back if the container doesn't get killed for timing out, and don't you forget it
+		swapBack := s.container.swap(nil, call.stderr, call.stderr, &call.Stats)
+		defer swapBack()
+
 		resp, err := s.udsClient.Do(req)
 		if err != nil {
 			common.Logger(ctx).WithError(err).Error("Got error from UDS socket")
 			errApp <- models.NewAPIError(http.StatusBadGateway, errors.New("error receiving function response"))
 			return
 		}
-		common.Logger(ctx).WithField("status", resp.StatusCode).Debug("Got resp from UDS socket")
+		common.Logger(ctx).WithField("resp", resp).Debug("Got resp from UDS socket")
 
 		defer resp.Body.Close()
 

api/agent/call.go

@@ -11,15 +11,12 @@ import (
 	"strings"
 	"time"
 
-	"go.opencensus.io/trace"
-
-	"net/textproto"
-
 	"github.com/fnproject/fn/api/agent/drivers"
 	"github.com/fnproject/fn/api/common"
 	"github.com/fnproject/fn/api/id"
 	"github.com/fnproject/fn/api/models"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )
 
 type Call interface {
@@ -55,44 +52,6 @@ const (
 	invokePath = "/invoke"
 )
 
-var skipTriggerHeaders = map[string]bool{
-	"Connection":        true,
-	"Keep-Alive":        true,
-	"Trailer":           true,
-	"Transfer-Encoding": true,
-	"TE":                true,
-	"Upgrade":           true,
-}
-
-// Sets up a call from an http trigger request
-func FromHTTPTriggerRequest(app *models.App, fn *models.Fn, trigger *models.Trigger, req *http.Request) CallOpt {
-	return func(c *call) error {
-		// transpose trigger headers into HTTP
-		headers := make(http.Header)
-		for k, vs := range req.Header {
-			// should be generally unnecessary but to be doubly sure.
-			k = textproto.CanonicalMIMEHeaderKey(k)
-			if skipTriggerHeaders[k] {
-				continue
-			}
-			rewriteKey := fmt.Sprintf("Fn-Http-H-%s", k)
-			for _, v := range vs {
-				headers.Add(rewriteKey, v)
-			}
-		}
-		requestUrl := reqURL(req)
-
-		headers.Set("Fn-Http-Method", req.Method)
-		headers.Set("Fn-Http-Request-Url", requestUrl)
-		headers.Set("Fn-Intent", "httprequest")
-		req.Header = headers
-
-		err := FromHTTPFnRequest(app, fn, req)(c)
-		c.Model().TriggerID = trigger.ID
-		return err
-	}
-}
-
 // Sets up a call from an http trigger request
 func FromHTTPFnRequest(app *models.App, fn *models.Fn, req *http.Request) CallOpt {
 	return func(c *call) error {
@@ -235,7 +194,17 @@ func FromModelAndInput(mCall *models.Call, in io.ReadCloser) CallOpt {
 	}
 }
 
-// WithWriter sets the writier that the call uses to send its output message to
+// WithTrigger adds trigger specific bits to a call.
+// TODO consider removal, this is from a shuffle
+func WithTrigger(t *models.Trigger) CallOpt {
+	return func(c *call) error {
+		// right now just set the trigger id
+		c.TriggerID = t.ID
+		return nil
+	}
+}
+
+// WithWriter sets the writer that the call uses to send its output message to
 // TODO this should be required
 func WithWriter(w io.Writer) CallOpt {
 	return func(c *call) error {
@@ -330,7 +299,6 @@ type call struct {
 	requestState   RequestState
 	containerState ContainerState
 	slotHashId     string
-	isLB           bool
 
 	// LB & Pure Runner Extra Config
 	extensions map[string]string
@@ -378,12 +346,6 @@ func (c *call) Start(ctx context.Context) error {
 	c.StartedAt = common.DateTime(time.Now())
 	c.Status = "running"
 
-	if !c.isLB {
-		if rw, ok := c.w.(http.ResponseWriter); ok { // TODO need to figure out better way to wire response headers in
-			rw.Header().Set("XXX-FXLB-WAIT", time.Time(c.StartedAt).Sub(time.Time(c.CreatedAt)).String())
-		}
-	}
-
 	if c.Type == models.TypeAsync {
 		// XXX (reed): make sure MQ reservation is lengthy. to skirt MQ semantics,
 		// we could add a new message to MQ w/ delay of call.Timeout and delete the

api/agent/lb_agent.go

@@ -119,7 +119,6 @@ func (a *lbAgent) GetCall(opts ...CallOpt) (Call, error) {
 
 	setupCtx(&c)
 
-	c.isLB = true
 	c.handler = a.cda
 	c.ct = a
 	c.stderr = &nullReadWriter{}

api/common/io_utils.go

@@ -107,7 +107,7 @@ func (g *ghostWriter) awaitRealWriter() (io.Writer, bool) {
 			g.cond.L.Unlock()
 			return nil, false
 		}
-		if _, ok := g.inner.(*waitWriter); ok {
+		if _, ok := g.inner.(*waitWriter); ok || g.inner == nil {
 			g.cond.Wait()
 		} else {
 			break
@@ -180,7 +180,7 @@ func (g *ghostReader) awaitRealReader() (io.Reader, bool) {
 			g.cond.L.Unlock()
 			return nil, false
 		}
-		if _, ok := g.inner.(*waitReader); ok {
+		if _, ok := g.inner.(*waitReader); ok || g.inner == nil {
 			g.cond.Wait()
 		} else {
 			break

api/server/runner_fninvoke.go

@@ -6,7 +6,6 @@ import (
 	"net/http"
 	"strconv"
 	"sync"
-	"time"
 
 	"github.com/fnproject/fn/api"
 	"github.com/fnproject/fn/api/agent"
@@ -20,16 +19,6 @@ var (
 	bufPool = &sync.Pool{New: func() interface{} { return new(bytes.Buffer) }}
 )
 
-type ResponseBufferingWriter interface {
-	http.ResponseWriter
-	io.Reader
-	Status() int
-	GetBuffer() *bytes.Buffer
-	SetBuffer(*bytes.Buffer)
-}
-
-var _ ResponseBufferingWriter = new(syncResponseWriter)
-
 // implements http.ResponseWriter
 // this little guy buffers responses from user containers and lets them still
 // set headers and such without us risking writing partial output [as much, the
@@ -41,13 +30,10 @@ type syncResponseWriter struct {
 	*bytes.Buffer
 }
 
-func (s *syncResponseWriter) Header() http.Header { return s.headers }
+var _ http.ResponseWriter = new(syncResponseWriter) // nice compiler errors
 
-// By storing the status here, we effectively buffer the response
+func (s *syncResponseWriter) Header() http.Header  { return s.headers }
 func (s *syncResponseWriter) WriteHeader(code int) { s.status = code }
-func (s *syncResponseWriter) Status() int                 { return s.status }
-func (s *syncResponseWriter) GetBuffer() *bytes.Buffer    { return s.Buffer }
-func (s *syncResponseWriter) SetBuffer(buf *bytes.Buffer) { s.Buffer = buf }
 
 // handleFnInvokeCall executes the function, for router handlers
 func (s *Server) handleFnInvokeCall(c *gin.Context) {
@@ -79,71 +65,84 @@ func (s *Server) handleFnInvokeCall2(c *gin.Context) error {
 }
 
 func (s *Server) ServeFnInvoke(c *gin.Context, app *models.App, fn *models.Fn) error {
-	writer := &syncResponseWriter{
+	return s.fnInvoke(c.Writer, c.Request, app, fn, nil)
-		headers: c.Writer.Header(),
 }
 
-	call, err := s.agent.GetCall(agent.WithWriter(writer), // XXX (reed): order matters [for now]
+func (s *Server) fnInvoke(resp http.ResponseWriter, req *http.Request, app *models.App, fn *models.Fn, trig *models.Trigger) error {
-		agent.FromHTTPFnRequest(app, fn, c.Request))
+	// TODO: we should get rid of the buffers, and stream back (saves memory (+splice), faster (splice), allows streaming, don't have to cap resp size)
+	// buffer the response before writing it out to client to prevent partials from trying to stream
+	buf := bufPool.Get().(*bytes.Buffer)
+	buf.Reset()
+	bufWriter := syncResponseWriter{
+		headers: resp.Header(),
+		status:  200,
+		Buffer:  buf,
+	}
 
+	var writer http.ResponseWriter = &bufWriter
+	writer = &jsonContentTypeTrapper{ResponseWriter: writer}
+
+	opts := []agent.CallOpt{
+		agent.WithWriter(writer), // XXX (reed): order matters [for now]
+		agent.FromHTTPFnRequest(app, fn, req),
+	}
+	if trig != nil {
+		opts = append(opts, agent.WithTrigger(trig))
+	}
+
+	call, err := s.agent.GetCall(opts...)
 	if err != nil {
 		return err
 	}
 
-	return s.fnInvoke(c, app, fn, writer, call)
+	err = s.agent.Submit(call)
+	if err != nil {
+		return err
 	}
 
-func (s *Server) fnInvoke(c *gin.Context, app *models.App, fn *models.Fn, writer ResponseBufferingWriter, call agent.Call) error {
+	// because we can...
-	// TODO: we should get rid of the buffers, and stream back (saves memory (+splice), faster (splice), allows streaming, don't have to cap resp size)
+	writer.Header().Set("Content-Length", strconv.Itoa(int(buf.Len())))
-	buf := bufPool.Get().(*bytes.Buffer)
-	buf.Reset()
-	var submitErr error
-	defer func() {
-		if buf.Len() == 0 && submitErr == nil {
-			bufPool.Put(buf) // TODO need to ensure this is safe with Dispatch?
-		}
-	}()
-	writer.SetBuffer(buf)
 
-	model := call.Model()
+	// buffered response writer traps status (so we can add headers), we need to write it still
-	{ // scope this, to disallow ctx use outside of this scope. add id for handleV1ErrorResponse logger
+	if bufWriter.status > 0 {
-		ctx, _ := common.LoggerWithFields(c.Request.Context(), logrus.Fields{"id": model.ID})
+		resp.WriteHeader(bufWriter.status)
-		c.Request = c.Request.WithContext(ctx)
 	}
 
-	submitErr = s.agent.Submit(call)
+	io.Copy(resp, buf)
-	if submitErr != nil {
+	bufPool.Put(buf) // at this point, submit returned without timing out, so we can re-use this one
-		// NOTE if they cancel the request then it will stop the call (kind of cool),
+	return nil
-		// we could filter that error out here too as right now it yells a little
-		if submitErr == models.ErrCallTimeoutServerBusy || submitErr == models.ErrCallTimeout {
-			// TODO maneuver
-			// add this, since it means that start may not have been called [and it's relevant]
-			c.Writer.Header().Add("XXX-FXLB-WAIT", time.Now().Sub(time.Time(model.CreatedAt)).String())
 }
-		return submitErr
+
+// TODO kill this thing after removing tests for http/json/default formats
+type jsonContentTypeTrapper struct {
+	http.ResponseWriter
+	committed bool
 }
-	// if they don't set a content-type - detect it
+
-	// TODO: remove this after removing all the formats (too many tests to scrub til then)
+var _ http.ResponseWriter = new(jsonContentTypeTrapper) // nice compiler errors
-	if writer.Header().Get("Content-Type") == "" {
+
-		// see http.DetectContentType, the go server is supposed to do this for us but doesn't appear to?
+func (j *jsonContentTypeTrapper) Write(b []byte) (int, error) {
+	if !j.committed {
+		// override default content type detection behavior to add json
+		j.detectContentType(b)
+	}
+	j.committed = true
+
+	// write inner
+	return j.ResponseWriter.Write(b)
+}
+
+func (j *jsonContentTypeTrapper) detectContentType(b []byte) {
+	if j.Header().Get("Content-Type") == "" {
+		// see http.DetectContentType
 		var contentType string
 		jsonPrefix := [1]byte{'{'} // stack allocated
-		if bytes.HasPrefix(writer.GetBuffer().Bytes(), jsonPrefix[:]) {
+		if bytes.HasPrefix(b, jsonPrefix[:]) {
 			// try to detect json, since DetectContentType isn't a hipster.
 			contentType = "application/json; charset=utf-8"
 		} else {
-			contentType = http.DetectContentType(writer.GetBuffer().Bytes())
+			contentType = http.DetectContentType(b)
 		}
-		writer.Header().Set("Content-Type", contentType)
+		j.Header().Set("Content-Type", contentType)
 	}
-
-	writer.Header().Set("Content-Length", strconv.Itoa(int(writer.GetBuffer().Len())))
-
-	if writer.Status() > 0 {
-		c.Writer.WriteHeader(writer.Status())
-	}
-
-	io.Copy(c.Writer, writer)
-
-	return nil
 }

api/server/runner_fninvoke_test.go

@@ -261,7 +261,7 @@ func TestFnInvokeRunnerExecution(t *testing.T) {
 				maxBody = 1024
 			}
 
-			callIds[i] = rec.Header().Get("Fn_call_id")
+			callIds[i] = rec.Header().Get("Fn-Call-Id")
 			cid := callIds[i]
 
 			if rec.Code != test.expectedCode {

api/server/runner_httptrigger.go

@@ -1,13 +1,14 @@
 package server
 
 import (
+	"fmt"
 	"net/http"
+	"net/textproto"
 	"strconv"
 
 	"strings"
 
 	"github.com/fnproject/fn/api"
-	"github.com/fnproject/fn/api/agent"
 	"github.com/fnproject/fn/api/models"
 	"github.com/gin-gonic/gin"
 )
@@ -60,21 +61,19 @@ func (s *Server) handleTriggerHTTPFunctionCall2(c *gin.Context) error {
 }
 
 type triggerResponseWriter struct {
-	syncResponseWriter
+	inner     http.ResponseWriter
 	committed bool
 }
 
-var _ ResponseBufferingWriter = new(triggerResponseWriter)
-
 func (trw *triggerResponseWriter) Header() http.Header {
-	return trw.headers
+	return trw.inner.Header()
 }
 
 func (trw *triggerResponseWriter) Write(b []byte) (int, error) {
 	if !trw.committed {
 		trw.WriteHeader(http.StatusOK)
 	}
-	return trw.GetBuffer().Write(b)
+	return trw.inner.Write(b)
 }
 
 func (trw *triggerResponseWriter) WriteHeader(statusCode int) {
@@ -83,56 +82,98 @@ func (trw *triggerResponseWriter) WriteHeader(statusCode int) {
 	}
 	trw.committed = true
 
-	for k, vs := range trw.Header() {
+	var fnStatus int
-		if strings.HasPrefix(k, "Fn-Http-H-") {
+	realHeaders := trw.Header()
-			// TODO strip out content-length and stuff here.
+	gwHeaders := make(http.Header, len(realHeaders))
-			realHeader := strings.TrimPrefix(k, "Fn-Http-H-")
+	for k, vs := range realHeaders {
-			if realHeader != "" { // case where header is exactly the prefix
+		switch {
-				for _, v := range vs {
+		case strings.HasPrefix(k, "Fn-Http-H-"):
-					trw.Header().Del(k)
+			gwHeader := strings.TrimPrefix(k, "Fn-Http-H-")
-					trw.Header().Add(realHeader, v)
+			if gwHeader != "" { // case where header is exactly the prefix
+				gwHeaders[gwHeader] = vs
+			}
+		case k == "Fn-Http-Status":
+			if len(vs) > 0 {
+				statusInt, err := strconv.Atoi(vs[0])
+				if err == nil {
+					fnStatus = statusInt
 				}
 			}
+		case k == "Content-Type", k == "Fn-Call-Id":
+			gwHeaders[k] = vs
 		}
 	}
 
+	// XXX(reed): this is O(3n)... yes sorry for making it work without making it perfect first
+	for k := range realHeaders {
+		realHeaders.Del(k)
+	}
+	for k, vs := range gwHeaders {
+		realHeaders[k] = vs
+	}
+
+	// XXX(reed): simplify / add tests for these behaviors...
 	gatewayStatus := 200
-
 	if statusCode >= 400 {
 		gatewayStatus = 502
+	} else if fnStatus > 0 {
+		gatewayStatus = fnStatus
 	}
 
-	status := trw.Header().Get("Fn-Http-Status")
+	trw.inner.WriteHeader(gatewayStatus)
-	if status != "" {
-		statusInt, err := strconv.Atoi(status)
-		if err == nil {
-			gatewayStatus = statusInt
-		}
 }
 
-	trw.WriteHeader(gatewayStatus)
+var skipTriggerHeaders = map[string]bool{
+	"Connection":        true,
+	"Keep-Alive":        true,
+	"Trailer":           true,
+	"Transfer-Encoding": true,
+	"TE":                true,
+	"Upgrade":           true,
+}
+
+func reqURL(req *http.Request) string {
+	if req.URL.Scheme == "" {
+		if req.TLS == nil {
+			req.URL.Scheme = "http"
+		} else {
+			req.URL.Scheme = "https"
+		}
+	}
+	if req.URL.Host == "" {
+		req.URL.Host = req.Host
+	}
+	return req.URL.String()
 }
 
 // ServeHTTPTrigger serves an HTTP trigger for a given app/fn/trigger based on the current request
 // This is exported to allow extensions to handle their own trigger naming and publishing
 func (s *Server) ServeHTTPTrigger(c *gin.Context, app *models.App, fn *models.Fn, trigger *models.Trigger) error {
-	triggerWriter := &triggerResponseWriter{
+	// transpose trigger headers into the request
-		syncResponseWriter{
+	req := c.Request
-			headers: c.Writer.Header()},
+	headers := make(http.Header, len(req.Header))
-		false,
+	for k, vs := range req.Header {
+		// should be generally unnecessary but to be doubly sure.
+		k = textproto.CanonicalMIMEHeaderKey(k)
+		if skipTriggerHeaders[k] {
+			continue
 		}
-	// GetCall can mod headers, assign an id, look up the route/app (cached),
+		switch k {
-	// strip params, etc.
+		case "Content-Type":
-	// this should happen ASAP to turn app name to app ID
+		default:
-
+			k = fmt.Sprintf("Fn-Http-H-%s", k)
-	// GetCall can mod headers, assign an id, look up the route/app (cached),
-	// strip params, etc.
-
-	call, err := s.agent.GetCall(agent.WithWriter(triggerWriter), // XXX (reed): order matters [for now]
-		agent.FromHTTPTriggerRequest(app, fn, trigger, c.Request))
-
-	if err != nil {
-		return err
 		}
-	return s.fnInvoke(c, app, fn, triggerWriter, call)
+		headers[k] = vs
+	}
+	requestURL := reqURL(req)
+
+	headers.Set("Fn-Http-Method", req.Method)
+	headers.Set("Fn-Http-Request-Url", requestURL)
+	headers.Set("Fn-Intent", "httprequest")
+	req.Header = headers
+
+	// trap the headers and rewrite them for http trigger
+	rw := &triggerResponseWriter{inner: c.Writer}
+
+	return s.fnInvoke(rw, req, app, fn, trigger)
 }

api/server/runner_httptrigger_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/fnproject/fn/api/logs"
 	"github.com/fnproject/fn/api/models"
 	"github.com/fnproject/fn/api/mqs"
+	"reflect"
 )
 
 func envTweaker(name, value string) func() {
@@ -273,10 +274,11 @@ func TestTriggerRunnerExecution(t *testing.T) {
 	httpDneRegistryFn := &models.Fn{ID: "http_dnereg_fn_id", Name: "http_dnereg_fn", AppID: app.ID, Image: rImgBs2, Format: "http", ResourceConfig: models.ResourceConfig{Memory: 64, Timeout: 30, IdleTimeout: 30}, Config: rCfg}
 	jsonFn := &models.Fn{ID: "json_fn_id", Name: "json_fn", AppID: app.ID, Image: rImg, Format: "json", ResourceConfig: models.ResourceConfig{Memory: 64, Timeout: 30, IdleTimeout: 30}, Config: rCfg}
 	oomFn := &models.Fn{ID: "http_oom_fn_id", Name: "http_fn", AppID: app.ID, Image: rImg, Format: "http", ResourceConfig: models.ResourceConfig{Memory: 8, Timeout: 30, IdleTimeout: 30}, Config: rCfg}
+	httpStreamFn := &models.Fn{ID: "http_stream_fn_id", Name: "http_stream_fn", AppID: app.ID, Image: rImg, Format: "http-stream", ResourceConfig: models.ResourceConfig{Memory: 64, Timeout: 30, IdleTimeout: 30}, Config: rCfg}
 
 	ds := datastore.NewMockInit(
 		[]*models.App{app},
-		[]*models.Fn{defaultFn, defaultDneFn, httpDneRegistryFn, oomFn, httpFn, jsonFn, httpDneFn},
+		[]*models.Fn{defaultFn, defaultDneFn, httpDneRegistryFn, oomFn, httpFn, jsonFn, httpDneFn, httpStreamFn},
 		[]*models.Trigger{
 			{ID: "1", Name: "1", Source: "/", Type: "http", AppID: app.ID, FnID: defaultFn.ID},
 			{ID: "2", Name: "2", Source: "/myhot", Type: "http", AppID: app.ID, FnID: httpFn.ID},
@@ -290,6 +292,7 @@ func TestTriggerRunnerExecution(t *testing.T) {
 			{ID: "10", Name: "10", Source: "/mybigoutputcold", Type: "http", AppID: app.ID, FnID: defaultFn.ID},
 			{ID: "11", Name: "11", Source: "/mybigoutputhttp", Type: "http", AppID: app.ID, FnID: httpFn.ID},
 			{ID: "12", Name: "12", Source: "/mybigoutputjson", Type: "http", AppID: app.ID, FnID: jsonFn.ID},
+			{ID: "13", Name: "13", Source: "/httpstream", Type: "http", AppID: app.ID, FnID: httpStreamFn.ID},
 		},
 	)
 	ls := logs.NewMock()
@@ -310,7 +313,7 @@ func TestTriggerRunnerExecution(t *testing.T) {
 	crasher := `{"echoContent": "_TRX_ID_", "isDebug": true, "isCrash": true}`                                     // crash container
 	oomer := `{"echoContent": "_TRX_ID_", "isDebug": true, "allocateMemory": 12000000}`                            // ask for 12MB
 	badHot := `{"echoContent": "_TRX_ID_", "invalidResponse": true, "isDebug": true}`                              // write a not json/http as output
-	ok := `{"echoContent": "_TRX_ID_", "isDebug": true}`                                            // good response / ok
+	ok := `{"echoContent": "_TRX_ID_", "responseContentType": "application/json; charset=utf-8", "isDebug": true}` // good response / ok
 	respTypeLie := `{"echoContent": "_TRX_ID_", "responseContentType": "foo/bar", "isDebug": true}`                // Content-Type: foo/bar
 	respTypeJason := `{"echoContent": "_TRX_ID_", "jasonContentType": "foo/bar", "isDebug": true}`                 // Content-Type: foo/bar
 
@@ -319,8 +322,26 @@ func TestTriggerRunnerExecution(t *testing.T) {
 	bigoutput := `{"echoContent": "_TRX_ID_", "isDebug": true, "trailerRepeat": 1000}` // 1000 trailers to exceed 2K
 	smalloutput := `{"echoContent": "_TRX_ID_", "isDebug": true, "trailerRepeat": 1}`  // 1 trailer < 2K
 
+	statusChecker := `{"echoContent": "_TRX_ID_", "isDebug": true, "responseCode":202, "responseContentType": "application/json; charset=utf-8"}`
+
+	fooHeader := map[string][]string{"Content-Type": {"application/hateson"}, "Test-Header": {"foo"}}
+	expFooHeaders := map[string][]string{"Content-Type": {"application/hateson"}, "Return-Header": {"foo", "bar"}}
+	expFooHeadersBody := `{"echoContent": "_TRX_ID_",
+		"expectHeaders": {
+			"Content-Type":["application/hateson"],
+			"Fn-Http-H-Test-Header":["foo"],
+			"Fn-Http-Method":["POST"],
+			"Fn-Http-Request-Url":["http://127.0.0.1:8080/t/myapp/httpstream"]
+		},
+		"returnHeaders": {
+			"Return-Header":["foo","bar"]
+		},
+		"responseContentType":"application/hateson",
+		"isDebug": true}`
+
 	testCases := []struct {
 		path               string
+		headers            map[string][]string
 		body               string
 		method             string
 		expectedCode       int
@@ -328,34 +349,47 @@ func TestTriggerRunnerExecution(t *testing.T) {
 		expectedErrSubStr  string
 		expectedLogsSubStr []string
 	}{
-		{"/t/myapp/", ok, "GET", http.StatusOK, expHeaders, "", nil},
+		{"/t/myapp/", nil, ok, "GET", http.StatusOK, expHeaders, "", nil},
 
-		{"/t/myapp/myhot", badHot, "GET", http.StatusBadGateway, expHeaders, "invalid http response", nil},
+		{"/t/myapp/myhot", nil, badHot, "GET", http.StatusBadGateway, expHeaders, "invalid http response", nil},
 		// hot container now back to normal:
-		{"/t/myapp/myhot", ok, "GET", http.StatusOK, expHeaders, "", nil},
+		{"/t/myapp/myhot", nil, ok, "GET", http.StatusOK, expHeaders, "", nil},
 
-		{"/t/myapp/myhotjason", badHot, "GET", http.StatusBadGateway, expHeaders, "invalid json response", nil},
+		{"/t/myapp/myhotjason", nil, badHot, "GET", http.StatusBadGateway, expHeaders, "invalid json response", nil},
 		// hot container now back to normal:
-		{"/t/myapp/myhotjason", ok, "GET", http.StatusOK, expHeaders, "", nil},
+		{"/t/myapp/myhotjason", nil, ok, "GET", http.StatusOK, expHeaders, "", nil},
 
-		{"/t/myapp/myhot", respTypeLie, "GET", http.StatusOK, expCTHeaders, "", nil},
+		{"/t/myapp/myhot", nil, respTypeLie, "GET", http.StatusOK, expCTHeaders, "", nil},
-		{"/t/myapp/myhotjason", respTypeLie, "GET", http.StatusOK, expCTHeaders, "", nil},
+		{"/t/myapp/myhotjason", nil, respTypeLie, "GET", http.StatusOK, expCTHeaders, "", nil},
-		{"/t/myapp/myhotjason", respTypeJason, "GET", http.StatusOK, expCTHeaders, "", nil},
+		{"/t/myapp/myhotjason", nil, respTypeJason, "GET", http.StatusOK, expCTHeaders, "", nil},
 
-		{"/t/myapp/myroute", ok, "GET", http.StatusOK, expHeaders, "", nil},
+		// XXX(reed): we test a lot of stuff in invoke, we really only need to test headers / status code here dude...
-		{"/t/myapp/myerror", crasher, "GET", http.StatusBadGateway, expHeaders, "container exit code 1", nil},
+		{"/t/myapp/httpstream", nil, ok, "POST", http.StatusOK, expHeaders, "", nil},
-		{"/t/myapp/mydne", ``, "GET", http.StatusNotFound, nil, "pull access denied", nil},
+		{"/t/myapp/httpstream", nil, statusChecker, "POST", 202, expHeaders, "", nil},
-		{"/t/myapp/mydnehot", ``, "GET", http.StatusNotFound, nil, "pull access denied", nil},
+		{"/t/myapp/httpstream", fooHeader, expFooHeadersBody, "POST", http.StatusOK, expFooHeaders, "", nil},
-		{"/t/myapp/mydneregistry", ``, "GET", http.StatusInternalServerError, nil, "connection refused", nil},
+		// NOTE: we can't test bad response framing anymore easily (eg invalid http response), should we even worry about it?
-		{"/t/myapp/myoom", oomer, "GET", http.StatusBadGateway, nil, "container out of memory", nil},
+		{"/t/myapp/httpstream", nil, respTypeLie, "POST", http.StatusOK, expCTHeaders, "", nil},
-		{"/t/myapp/myhot", multiLog, "GET", http.StatusOK, nil, "", multiLogExpectHot},
+		//{"/t/myapp/httpstream", nil, crasher, "POST", http.StatusBadGateway, expHeaders, "error receiving function response", nil},
-		{"/t/myapp/", multiLog, "GET", http.StatusOK, nil, "", multiLogExpectCold},
+		//// XXX(reed): we could stop buffering function responses so that we can stream things?
-		{"/t/myapp/mybigoutputjson", bigoutput, "GET", http.StatusBadGateway, nil, "function response too large", nil},
+		//{"/t/myapp/httpstream", nil, bigoutput, "POST", http.StatusBadGateway, nil, "function response too large", nil},
-		{"/t/myapp/mybigoutputjson", smalloutput, "GET", http.StatusOK, nil, "", nil},
+		//{"/t/myapp/httpstream", nil, smalloutput, "POST", http.StatusOK, expHeaders, "", nil},
-		{"/t/myapp/mybigoutputhttp", bigoutput, "GET", http.StatusBadGateway, nil, "", nil},
+		//// XXX(reed): meh we really should try to get oom out, but maybe it's better left to the logs?
-		{"/t/myapp/mybigoutputhttp", smalloutput, "GET", http.StatusOK, nil, "", nil},
+		//{"/t/myapp/httpstream", nil, oomer, "POST", http.StatusBadGateway, nil, "error receiving function response", nil},
-		{"/t/myapp/mybigoutputcold", bigoutput, "GET", http.StatusBadGateway, nil, "", nil},
+
-		{"/t/myapp/mybigoutputcold", smalloutput, "GET", http.StatusOK, nil, "", nil},
+		{"/t/myapp/myroute", nil, ok, "GET", http.StatusOK, expHeaders, "", nil},
+		{"/t/myapp/myerror", nil, crasher, "GET", http.StatusBadGateway, expHeaders, "container exit code 1", nil},
+		{"/t/myapp/mydne", nil, ``, "GET", http.StatusNotFound, nil, "pull access denied", nil},
+		{"/t/myapp/mydnehot", nil, ``, "GET", http.StatusNotFound, nil, "pull access denied", nil},
+		{"/t/myapp/mydneregistry", nil, ``, "GET", http.StatusInternalServerError, nil, "connection refused", nil},
+		{"/t/myapp/myoom", nil, oomer, "GET", http.StatusBadGateway, nil, "container out of memory", nil},
+		{"/t/myapp/myhot", nil, multiLog, "GET", http.StatusOK, nil, "", multiLogExpectHot},
+		{"/t/myapp/", nil, multiLog, "GET", http.StatusOK, nil, "", multiLogExpectCold},
+		{"/t/myapp/mybigoutputjson", nil, bigoutput, "GET", http.StatusBadGateway, nil, "function response too large", nil},
+		{"/t/myapp/mybigoutputjson", nil, smalloutput, "GET", http.StatusOK, nil, "", nil},
+		{"/t/myapp/mybigoutputhttp", nil, bigoutput, "GET", http.StatusBadGateway, nil, "", nil},
+		{"/t/myapp/mybigoutputhttp", nil, smalloutput, "GET", http.StatusOK, nil, "", nil},
+		{"/t/myapp/mybigoutputcold", nil, bigoutput, "GET", http.StatusBadGateway, nil, "", nil},
+		{"/t/myapp/mybigoutputcold", nil, smalloutput, "GET", http.StatusOK, nil, "", nil},
 	}
 
 	callIds := make([]string, len(testCases))
@@ -364,7 +398,11 @@ func TestTriggerRunnerExecution(t *testing.T) {
 		t.Run(fmt.Sprintf("Test_%d_%s", i, strings.Replace(test.path, "/", "_", -1)), func(t *testing.T) {
 			trx := fmt.Sprintf("_trx_%d_", i)
 			body := strings.NewReader(strings.Replace(test.body, "_TRX_ID_", trx, 1))
-			_, rec := routerRequest(t, srv.Router, test.method, test.path, body)
+			req := createRequest(t, test.method, test.path, body)
+			if test.headers != nil {
+				req.Header = test.headers
+			}
+			_, rec := routerRequest2(t, srv.Router, req)
 			respBytes, _ := ioutil.ReadAll(rec.Body)
 			respBody := string(respBytes)
 			maxBody := len(respBody)
@@ -372,7 +410,7 @@ func TestTriggerRunnerExecution(t *testing.T) {
 				maxBody = 1024
 			}
 
-			callIds[i] = rec.Header().Get("Fn_call_id")
+			callIds[i] = rec.Header().Get("Fn-Call-Id")
 
 			if rec.Code != test.expectedCode {
 				isFailure = true
@@ -396,10 +434,10 @@ func TestTriggerRunnerExecution(t *testing.T) {
 
 			if test.expectedHeaders != nil {
 				for name, header := range test.expectedHeaders {
-					if header[0] != rec.Header().Get(name) {
+					if !reflect.DeepEqual(header, rec.Header()[name]) {
 						isFailure = true
-						t.Errorf("Test %d: Expected header `%s` to be `%s` but was `%s`. body: `%s`",
+						t.Errorf("Test %d: Expected header `%s` to be `%v` but was `%v`. body: `%s`",
-							i, name, header[0], rec.Header().Get(name), respBody)
+							i, name, header, rec.Header()[name], respBody)
 					}
 				}
 			}

docs/definitions.md

@@ -204,14 +204,14 @@ curl -v localhost:8080/r/newapp/envsync
 > Accept: */*
 > 
 < HTTP/1.1 200 OK
-< Fn_call_id: f5621e8b-725a-4ba9-8323-b8cdc02ce37e
+< Fn-Call-Id: f5621e8b-725a-4ba9-8323-b8cdc02ce37e
 < Date: Fri, 02 Jun 2017 12:31:30 GMT
 < Content-Length: 489
 < Content-Type: text/plain; charset=utf-8
 < 
 ...
 ```
-Corresponding HTTP header is `Fn_call_id`.
+Corresponding HTTP header is `Fn-Call-Id`.
 
 ### Per-route calls
 

images/fn-test-utils/Gopkg.lock

@@ -8,7 +8,7 @@
     ".",
     "utils"
   ]
-  revision = "d1fa834929bb1579d770eded860a3a54e1f3502b"
+  revision = "bd03f2c17b4d9e43525829d194174b35b5c47b54"
 
 [solve-meta]
   analyzer-name = "dep"

images/fn-test-utils/fn-test-utils.go

@@ -65,6 +65,11 @@ type AppRequest struct {
 	PostErrGarbage string `json:"postErrGarbage,omitempty"`
 	// test empty body
 	IsEmptyBody bool `json:"isEmptyBody,omitempty"`
+	// test headers that come into function
+	ExpectHeaders map[string][]string `json:"expectHeaders,omitempty"`
+	// send some headers out explicitly
+	ReturnHeaders map[string][]string `json:"returnHeaders,omitempty"`
+
 	// TODO: simulate slow read/slow write
 	// TODO: simulate partial IO write/read
 	// TODO: simulate high cpu usage (async and sync)
@@ -119,11 +124,6 @@ func AppHandler(ctx context.Context, in io.Reader, out io.Writer) {
 }
 
 func finalizeRequest(out io.Writer, req *AppRequest, resp *AppResponse) {
-	// custom response code
-	if req.ResponseCode != 0 {
-		fdk.WriteStatus(out, req.ResponseCode)
-	}
-
 	// custom content type
 	if req.ResponseContentType != "" {
 		fdk.SetHeader(out, "Content-Type", req.ResponseContentType)
@@ -137,6 +137,19 @@ func finalizeRequest(out io.Writer, req *AppRequest, resp *AppResponse) {
 		fdk.SetHeader(out, "Content-Type", req.JasonContentType)
 	}
 
+	if req.ReturnHeaders != nil {
+		for k, vs := range req.ReturnHeaders {
+			for _, v := range vs {
+				fdk.AddHeader(out, k, v)
+			}
+		}
+	}
+
+	// custom response code
+	if req.ResponseCode != 0 {
+		fdk.WriteStatus(out, req.ResponseCode)
+	}
+
 	if !req.IsEmptyBody {
 		json.NewEncoder(out).Encode(resp)
 	}
@@ -155,6 +168,7 @@ func processRequest(ctx context.Context, in io.Reader) (*AppRequest, *AppRespons
 		log.Printf("Received format %v", format)
 		log.Printf("Received request %#v", request)
 		log.Printf("Received headers %v", fnctx.Header)
+		log.Printf("Received http headers %v", fnctx.HTTPHeader)
 		log.Printf("Received config %v", fnctx.Config)
 	}
 
@@ -219,6 +233,23 @@ func processRequest(ctx context.Context, in io.Reader) (*AppRequest, *AppRespons
 		log.Fatalln("Crash requested")
 	}
 
+	if request.ExpectHeaders != nil {
+		for name, header := range request.ExpectHeaders {
+			if strings.HasPrefix(name, "Fn-Http-H-") {
+				// if it's an http header, make sure our other bucket works.
+				// idk this seems like a weird good idea, maybe we should only test/expose one or the other...
+				if h2 := fnctx.HTTPHeader.Get(strings.TrimPrefix(name, "Fn-Http-H-")); header[0] != h2 {
+					log.Fatalf("Expected http header `%s` to be `%s` but was `%s`.",
+						name, header[0], h2)
+				}
+			}
+			if h2 := fnctx.Header.Get(name); header[0] != h2 {
+				log.Fatalf("Expected header `%s` to be `%s` but was `%s`",
+					name, header[0], h2)
+			}
+		}
+	}
+
 	resp := AppResponse{
 		Data:    data,
 		Request: request,

vendor/github.com/fnproject/fdk-go/circle.yml

@@ -0,0 +1,33 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/golang:1.11.0
+    working_directory: ~/fdk-go
+    steps:
+      - checkout
+      - setup_remote_docker:
+          docker_layer_caching: true
+      - run: docker version
+      - run: docker pull fnproject/fnserver
+      # installing Fn CLI and starting the Fn server
+      - run:
+          command: |
+            curl -LSs https://raw.githubusercontent.com/fnproject/cli/master/install | sh
+      - run:
+          command: fn build
+          working_directory: examples/hello
+      - deploy:
+          command: |
+            if [[ "${CIRCLE_BRANCH}" == "master" && -z "${CIRCLE_PR_REPONAME}" ]]; then
+              func_version=$(awk '/^version:/ { print $2; }' func.yaml)
+              printenv DOCKER_PASS | docker login -u ${DOCKER_USER} --password-stdin
+              git config --global user.email "ci@fnproject.com"
+              git config --global user.name "CI"
+              git branch --set-upstream-to=origin/${CIRCLE_BRANCH} ${CIRCLE_BRANCH}
+              docker tag "hello:${func_version}" "fnproject/fdk-go-hello:${func_version}"
+              docker tag "hello:${func_version}" "fnproject/fdk-go-hello:latest"
+              docker push "fnproject/fdk-go-hello:${func_version}"
+              docker push "fnproject/fdk-go-hello:latest"
+            fi
+          working_directory: examples/hello

vendor/github.com/fnproject/fdk-go/examples/hello/Gopkg.lock

@@ -8,7 +8,7 @@
     ".",
     "utils"
   ]
-  revision = "5d768b2006f11737b6a69a758ddd6d2fac04923e"
+  revision = "c6ce6afbce0935ffdf0e228471406d0f966736a5"
 
 [solve-meta]
   analyzer-name = "dep"

vendor/github.com/fnproject/fdk-go/examples/hello/func.go

@@ -13,20 +13,17 @@ func main() {
 	fdk.Handle(fdk.HandlerFunc(myHandler))
 }
 
-func myHandler(ctx context.Context, in io.Reader, out io.Writer) {
+type Person struct {
-	var person struct {
 	Name string `json:"name"`
 }
-	json.NewDecoder(in).Decode(&person)
-	if person.Name == "" {
-		person.Name = "World"
-	}
 
+func myHandler(ctx context.Context, in io.Reader, out io.Writer) {
+	p := &Person{Name: "World"}
+	json.NewDecoder(in).Decode(p)
 	msg := struct {
 		Msg string `json:"message"`
 	}{
-		Msg: fmt.Sprintf("Hello %s", person.Name),
+		Msg: fmt.Sprintf("Hello %s", p.Name),
 	}
-
 	json.NewEncoder(out).Encode(&msg)
 }

vendor/github.com/fnproject/fdk-go/examples/hello/func.yaml

@@ -0,0 +1,6 @@
+schema_version: 20180708
+name: hello
+version: 0.0.1
+runtime: go
+entrypoint: ./func
+format: http-stream

vendor/github.com/fnproject/fdk-go/fdk.go

@@ -24,6 +24,7 @@ func (f HandlerFunc) Serve(ctx context.Context, in io.Reader, out io.Writer) {
 func Context(ctx context.Context) *Ctx {
 	utilsCtx := utils.Context(ctx)
 	return &Ctx{
+		HTTPHeader: utilsCtx.HTTPHeader,
 		Header:     utilsCtx.Header,
 		Config:     utilsCtx.Config,
 		RequestURL: utilsCtx.RequestURL,
@@ -33,6 +34,7 @@ func Context(ctx context.Context) *Ctx {
 
 func WithContext(ctx context.Context, fnctx *Ctx) context.Context {
 	utilsCtx := &utils.Ctx{
+		HTTPHeader: fnctx.HTTPHeader,
 		Header:     fnctx.Header,
 		Config:     fnctx.Config,
 		RequestURL: fnctx.RequestURL,
@@ -43,7 +45,12 @@ func WithContext(ctx context.Context, fnctx *Ctx) context.Context {
 
 // Ctx provides access to Config and Headers from fn.
 type Ctx struct {
+	// Header are the unmodified headers as sent to the container, see
+	// HTTPHeader for specific trigger headers
 	Header http.Header
+	// HTTPHeader are the request headers as they appear on the original HTTP request,
+	// for an http trigger.
+	HTTPHeader http.Header
 	Config     map[string]string
 	RequestURL string
 	Method     string
@@ -78,5 +85,12 @@ func WriteStatus(out io.Writer, status int) {
 // function and fn server via any of the supported formats.
 func Handle(handler Handler) {
 	format, _ := os.LookupEnv("FN_FORMAT")
+
+	path := os.Getenv("FN_LISTENER")
+	if path != "" {
+		utils.StartHTTPServer(handler, path, format)
+		return
+	}
+
 	utils.Do(handler, format, os.Stdin, os.Stdout)
 }

vendor/github.com/fnproject/fdk-go/utils/httpstream.go

@@ -0,0 +1,168 @@
+package utils
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+// in case we go over the timeout, need to use a pool since prev buffer may not be freed
+var bufPool = &sync.Pool{New: func() interface{} { return new(bytes.Buffer) }}
+
+type HTTPHandler struct {
+	handler Handler
+}
+
+func (h *HTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	buf := bufPool.Get().(*bytes.Buffer)
+	defer bufPool.Put(buf)
+
+	resp := Response{
+		Writer: buf,
+		Status: 200,
+		Header: make(http.Header), // XXX(reed): pool these too
+	}
+
+	ctx := WithContext(r.Context(), &Ctx{
+		Config: BuildConfig(),
+	})
+
+	ctx, cancel := decapHeaders(ctx, r)
+	defer cancel()
+
+	h.handler.Serve(ctx, r.Body, &resp)
+
+	encapHeaders(w, resp)
+
+	// XXX(reed): 504 if ctx is past due / handle errors with 5xx? just 200 for now
+	// copy response from user back up now with headers in place...
+	io.Copy(w, buf)
+
+	// XXX(reed): handle streaming, we have to intercept headers but not necessarily body (ie no buffer)
+}
+
+func encapHeaders(fn http.ResponseWriter, user Response) {
+	fnh := fn.Header()
+	fnh.Set("Fn-Http-Status", strconv.Itoa(user.Status))
+
+	for k, vs := range user.Header {
+		switch k {
+		case "Content-Type":
+			// don't modify this one...
+		default:
+			// prepend this guy
+			k = "Fn-Http-H-" + k
+		}
+
+		for _, v := range vs {
+			fnh.Add(k, v)
+		}
+	}
+}
+
+// TODO can make this the primary means of context construction
+func decapHeaders(ctx context.Context, r *http.Request) (_ context.Context, cancel func()) {
+	rctx := Context(ctx)
+	var deadline string
+
+	// copy the original headers in then reduce for http headers
+	rctx.Header = r.Header
+	rctx.HTTPHeader = make(http.Header, len(r.Header)) // XXX(reed): oversized, esp if not http
+
+	// find things we need, and for http headers add them to the httph bucket
+
+	for k, vs := range r.Header {
+		switch k {
+		case "Fn-Deadline":
+			deadline = vs[0]
+		case "Fn-Call-Id":
+			rctx.callId = vs[0]
+		case "Content-Type":
+			// just leave this one instead of deleting
+		default:
+			continue
+		}
+
+		if !strings.HasPrefix(k, "Fn-Http-") {
+			// XXX(reed): we need 2 header buckets on ctx, one for these and one for the 'original req' headers
+			// for now just nuke so the headers are clean...
+			continue
+		}
+
+		switch {
+		case k == "Fn-Http-Request-Url":
+			rctx.RequestURL = vs[0]
+		case k == "Fn-Http-Method":
+			rctx.Method = vs[0]
+		case strings.HasPrefix(k, "Fn-Http-H-"):
+			for _, v := range vs {
+				rctx.HTTPHeader.Add(strings.TrimPrefix(k, "Fn-Http-H-"), v)
+			}
+		default:
+			// XXX(reed): just delete it? how is it here? maybe log/panic
+		}
+	}
+
+	return CtxWithDeadline(ctx, deadline)
+}
+
+func StartHTTPServer(handler Handler, path, format string) {
+
+	uri, err := url.Parse(path)
+	if err != nil {
+		log.Fatalln("url parse error: ", path, err)
+	}
+
+	server := http.Server{
+		Handler: &HTTPHandler{
+			handler: handler,
+		},
+	}
+
+	// try to remove pre-existing UDS: ignore errors here
+	phonySock := filepath.Join(filepath.Dir(uri.Path), "phony"+filepath.Base(uri.Path))
+	if uri.Scheme == "unix" {
+		os.Remove(phonySock)
+		os.Remove(uri.Path)
+	}
+
+	listener, err := net.Listen(uri.Scheme, phonySock)
+	if err != nil {
+		log.Fatalln("net.Listen error: ", err)
+	}
+
+	if uri.Scheme == "unix" {
+		sockPerm(phonySock, uri.Path)
+	}
+
+	err = server.Serve(listener)
+	if err != nil && err != http.ErrServerClosed {
+		log.Fatalln("serve error: ", err)
+	}
+}
+
+func sockPerm(phonySock, realSock string) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	// somehow this is the best way to get a permissioned sock file, don't ask questions, life is sad and meaningless
+	err := os.Chmod(phonySock, 0666)
+	if err != nil {
+		log.Fatalln("error giving sock file a perm", err)
+	}
+
+	err = os.Link(phonySock, realSock)
+	if err != nil {
+		log.Fatalln("error linking fake sock to real sock", err)
+	}
+}

vendor/github.com/fnproject/fdk-go/utils/utils.go

@@ -26,12 +26,25 @@ func WithContext(ctx context.Context, fnctx *Ctx) context.Context {
 
 // Ctx provides access to Config and Headers from fn.
 type Ctx struct {
+	// Header are the unmodified headers as sent to the container, see
+	// HTTPHeader for specific trigger headers
 	Header http.Header
+
+	// HTTPHeader are the request headers as they appear on the original HTTP request,
+	// for an http trigger.
+	HTTPHeader http.Header
 	Config     map[string]string
 	RequestURL string
 	Method     string
+
+	// XXX(reed): should turn this whole mess into some kind of event that we can
+	// morph into another type of an event after http/json/default die
+	// XXX(reed): should strip out eg FN_APP_NAME, etc as fields so Config is actually the config not config + fn's env vars
+	callId string
 }
 
+func (c Ctx) CallId() string { return c.callId }
+
 type key struct{}
 
 var ctxKey = new(key)