Fix missing values in context created with common.BackgroundContext (#950)

* Fix missing values in context when created through common.BackgroundContext

* pin to mysql 5.7.22

api/common/ctx.go

@@ -2,10 +2,9 @@ package common
 
 import (
 	"context"
+	"time"
 
 	"github.com/sirupsen/logrus"
-	"go.opencensus.io/tag"
-	"go.opencensus.io/trace"
 )
 
 type contextKey string
@@ -34,25 +33,34 @@ func LoggerWithFields(ctx context.Context, fields logrus.Fields) (context.Contex
 	return ctx, l
 }
 
+// contextWithNoDeadline is an implementation of context.Context which delegates
+// Value() to its parent, but it has no deadline and it is never cancelled, just
+// like a context.Background().
+type contextWithNoDeadline struct {
+	original context.Context
+}
+
+func (ctx *contextWithNoDeadline) Deadline() (deadline time.Time, ok bool) {
+	return context.Background().Deadline()
+}
+
+func (ctx *contextWithNoDeadline) Done() <-chan struct{} {
+	return context.Background().Done()
+}
+
+func (ctx *contextWithNoDeadline) Err() error {
+	return context.Background().Err()
+}
+
+func (ctx *contextWithNoDeadline) Value(key interface{}) interface{} {
+	return ctx.original.Value(key)
+}
+
 // BackgroundContext returns a context that is specifically not a child of the
 // provided parent context wrt any cancellation or deadline of the parent,
-// returning a context that contains all values only. At present, this is a
+// so that it contains all values only.
-// best effort as there is not a great way to extract all values, known values:
-// * logger
-// * span
-// * tags
-// (TODO(reed): we could have our own context.Context implementer that stores
-// all values from WithValue in a bucket we could extract more easily?)
 func BackgroundContext(ctx context.Context) context.Context {
-	logger := Logger(ctx)
+	return &contextWithNoDeadline{
-	span := trace.FromContext(ctx)
+		original: ctx,
-	tagMap := tag.FromContext(ctx)
+	}
-
-	// fresh context
-	ctx = context.Background()
-
-	ctx = tag.NewContext(ctx, tagMap)
-	ctx = trace.WithSpan(ctx, span)
-	ctx = WithLogger(ctx, logger)
-	return ctx
 }

api_test.sh

@@ -15,7 +15,7 @@ case "$1" in
     "mysql" )
     DB_CONTAINER="func-mysql-test"
     docker rm -fv ${DB_CONTAINER} || echo No prev mysql test db container
-    docker run --name ${DB_CONTAINER} -p 3306:3306 -e MYSQL_DATABASE=funcs -e MYSQL_ROOT_PASSWORD=root -d mysql
+    docker run --name ${DB_CONTAINER} -p 3306:3306 -e MYSQL_DATABASE=funcs -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7.22
     MYSQL_HOST=`host ${DB_CONTAINER}`
     MYSQL_PORT=3306
     export FN_DB_URL="mysql://root:root@tcp(${MYSQL_HOST}:${MYSQL_PORT})/funcs"

system_test.sh

@@ -20,7 +20,7 @@ case "$1" in
     "mysql" )
     DB_CONTAINER="func-mysql-system-test"
     docker rm -fv ${DB_CONTAINER} || echo No prev mysql test db container
-    docker run --name ${DB_CONTAINER} -p 3307:3306 -e MYSQL_DATABASE=funcs -e MYSQL_ROOT_PASSWORD=root -d mysql
+    docker run --name ${DB_CONTAINER} -p 3307:3306 -e MYSQL_DATABASE=funcs -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7.22
     MYSQL_HOST=`host ${DB_CONTAINER}`
     MYSQL_PORT=3307
     export FN_DB_URL="mysql://root:root@tcp(${MYSQL_HOST}:${MYSQL_PORT})/funcs"

test.sh

@@ -8,7 +8,7 @@ source ./helpers.sh
 remove_containers
 
 docker run --name func-postgres-test -e "POSTGRES_DB=funcs" -e "POSTGRES_PASSWORD=root" -p 5432:5432 -d postgres:9.3-alpine
-docker run --name func-mysql-test -p 3306:3306 -e MYSQL_DATABASE=funcs -e MYSQL_ROOT_PASSWORD=root -d mysql
+docker run --name func-mysql-test -p 3306:3306 -e MYSQL_DATABASE=funcs -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7.22
 docker run -d -p 9000:9000 --name func-minio-test -e "MINIO_ACCESS_KEY=admin" -e "MINIO_SECRET_KEY=password" minio/minio server /data
 
 MYSQL_HOST=`host func-mysql-test`