Add Google Cloud Pub Sub reporter

.gitignore

@@ -24,3 +24,4 @@ _testmain.go
 *.prof
 
 .idea
+vendor

README.md

@@ -98,5 +98,8 @@ Producer digesting JSON V2 Spans. The reporter uses the
 [Sarama async producer](https://godoc.org/github.com/Shopify/sarama#AsyncProducer)
 underneath.
 
+#### GCP Pubsub Reporter
+Reporter transporting Spans to the Zipkin server using a Pubsub
+
 ## usage and examples
 [HTTP Server Example](example_httpserver_test.go)

go.mod

@@ -1,25 +1,31 @@
 module github.com/openzipkin/zipkin-go
 
 require (
+	cloud.google.com/go v0.38.0
 	github.com/Shopify/sarama v1.19.0
 	github.com/Shopify/toxiproxy v2.1.4+incompatible // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/eapache/go-resiliency v1.1.0 // indirect
 	github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 // indirect
 	github.com/eapache/queue v1.1.0 // indirect
+	github.com/envoyproxy/go-control-plane v0.6.9 // indirect
+	github.com/gogo/googleapis v1.1.0 // indirect
 	github.com/gogo/protobuf v1.2.0
-	github.com/golang/protobuf v1.2.0
+	github.com/golang/protobuf v1.3.1
 	github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db // indirect
+	github.com/googleapis/gax-go v2.0.2+incompatible // indirect
 	github.com/gorilla/context v1.1.1 // indirect
 	github.com/gorilla/mux v1.6.2
+	github.com/lyft/protoc-gen-validate v0.0.13 // indirect
 	github.com/onsi/ginkgo v1.7.0
 	github.com/onsi/gomega v1.4.3
 	github.com/pierrec/lz4 v1.0.2-0.20190131084431-473cd7ce01a1 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a // indirect
 	github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94
-	golang.org/x/net v0.0.0-20190311183353-d8887717615a
-	golang.org/x/sync v0.0.0-20181108010431-42b317875d0f // indirect
-	google.golang.org/grpc v1.20.0
+	go.opencensus.io v0.22.0 // indirect
+	golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c
+	google.golang.org/api v0.7.0 // indirect
+	google.golang.org/grpc v1.20.1
 )
 
 go 1.12

go.sum

@@ -1,4 +1,8 @@
+cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0 h1:ROfEUZz+Gh5pa62DJWXSaonyu3StP6EA6lPEXPI6mCo=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/Shopify/sarama v1.19.0 h1:9oksLxC6uxVPHPVYUmq6xhr1BOF/hHobWH2UzO67z1s=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
@@ -22,16 +26,32 @@ github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7a
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db h1:woRePGFeVFfLKN/pOkfl+p/TAqKOfFu+7KPlMVpok/w=
 github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
+github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
+github.com/googleapis/gax-go v2.0.2+incompatible h1:silFMLAnr330+NRuag/VjIGF7TLp/LBrV2CJKFLWEww=
+github.com/googleapis/gax-go v2.0.2+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=
+github.com/googleapis/gax-go/v2 v2.0.4 h1:hU4mGcQI4DaAYW+IbTun+2qEZVFxK0ySjQLTbS0VQKc=
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 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/mux v1.6.2 h1:Pgr17XVTNXAk3q/r4CpKzC5xBM/qW1uVLV+IhRZpIIk=
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+github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
+github.com/hashicorp/golang-lru v0.5.1 h1:0hERBMJE1eitiLkihrMvRVBYAkpHzc/J3QdDN+dAcgU=
+github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/lyft/protoc-gen-validate v0.0.13/go.mod h1:XbGvPuh87YZc5TdIa2/I4pLk0QoUACkjt2znoq26NVQ=
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 github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
@@ -45,26 +65,75 @@ github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a h1:9ZKAASQSHhD
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94 h1:0ngsPmuP6XIjiFRNFYlvKwSr5zff2v+uPHaffZ6/M4k=
 github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=
+go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
+go.opencensus.io v0.22.0 h1:C9hSCOW830chIVkdja34wa6Ky+IzWllkUinR+BtRZd4=
+go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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 google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
+google.golang.org/grpc v1.20.1 h1:Hz2g2wirWK7H0qIIhGIqRGTuMwTE8HEKFnDZZ7lm9NU=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
@@ -74,3 +143,5 @@ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWD
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

reporter/pubsub/pubsub.go

@@ -0,0 +1,109 @@
+package pubsub
+
+import (
+	"cloud.google.com/go/pubsub"
+	"context"
+	"encoding/json"
+	"github.com/openzipkin/zipkin-go/model"
+	"github.com/openzipkin/zipkin-go/reporter"
+	"log"
+	"os"
+)
+
+const defaultPubSubTopic = "opentracing"
+
+// Reporter implements Reporter by publishing spans to a GCP pubsub.
+type Reporter struct {
+	logger *log.Logger
+	topic  string
+	client *pubsub.Client
+}
+
+// ReporterOption sets a parameter for the PubSubReporter
+type ReporterOption func(c *Reporter)
+
+// Send send span to topic
+func (r *Reporter) Send(s model.SpanModel) {
+	// Zipkin expects the message to be wrapped in an array
+	ss := []model.SpanModel{s}
+	m, err := json.Marshal(ss)
+	if err != nil {
+		r.logger.Printf("failed when marshalling the span: %s\n", err.Error())
+		return
+	}
+	err = r.publish(m)
+	if err != nil {
+		r.logger.Printf("Error publishing message to pubsub: %s msg: %s", err.Error(), string(m))
+	}
+}
+
+// Close close span
+func (r *Reporter) Close() error {
+	return r.client.Close()
+}
+
+// Logger sets the logger used to report errors in the collection
+// process.
+func Logger(logger *log.Logger) ReporterOption {
+	return func(c *Reporter) {
+		c.logger = logger
+	}
+}
+
+// Client sets the client used to produce to pubsub.
+func Client(client *pubsub.Client) ReporterOption {
+	return func(c *Reporter) {
+		c.client = client
+	}
+}
+
+// Topic sets the pubsub topic to attach the reporter producer on.
+func Topic(t string) ReporterOption {
+	return func(c *Reporter) {
+		c.topic = t
+	}
+}
+
+// NewReporter returns a new pubsub-backed Reporter. address should be a slice of
+// TCP endpoints of the form "host:port".
+func NewReporter(options ...ReporterOption) (reporter.Reporter, error) {
+	topic := os.Getenv("OPENTRACING_PUBSUB_TOPIC")
+	if topic == "" {
+		topic = defaultPubSubTopic
+	}
+
+	r := &Reporter{
+		logger: log.New(os.Stderr, "", log.LstdFlags),
+		topic:  defaultPubSubTopic,
+	}
+
+	for _, option := range options {
+		option(r)
+	}
+	if r.client == nil {
+		ctx := context.Background()
+		proj := os.Getenv("GOOGLE_CLOUD_PROJECT")
+		if proj == "" {
+			log.Fatal("GOOGLE_CLOUD_PROJECT environment variable must be set. Traces wont be sent to pubsub")
+		}
+		client, err := pubsub.NewClient(ctx, proj)
+		if err != nil {
+			log.Fatalf("Could not create pubsub Client: %v", err)
+		}
+		r.client = client
+	}
+
+	return r, nil
+}
+
+func (r *Reporter) publish(msg []byte) error {
+	ctx := context.Background()
+	t := r.client.Topic(r.topic)
+
+	result := t.Publish(ctx, &pubsub.Message{
+		// data must be a ByteString
+		Data: msg,
+	})
+	_, err := result.Get(ctx)
+	return err
+}

reporter/pubsub/pubsub_test.go

@@ -0,0 +1,81 @@
+package pubsub
+
+import (
+	"context"
+	"fmt"
+	"github.com/openzipkin/zipkin-go/model"
+	"os"
+	"sync"
+	"testing"
+	"time"
+
+	"cloud.google.com/go/pubsub"
+)
+
+var topicID string
+
+var once sync.Once // guards cleanup related operations in setup.
+
+func setup(t *testing.T) *pubsub.Client {
+	ctx := context.Background()
+	proj := os.Getenv("GOOGLE_CLOUD_PROJECT")
+	fmt.Printf("GCP Project: %s\n", proj)
+	topicID = "test-topic"
+
+	client, err := pubsub.NewClient(ctx, proj)
+	if err != nil {
+		t.Fatalf("failed to create client: %v", err)
+	}
+
+	_, err = client.CreateTopic(ctx, topicID)
+	if err != nil {
+		t.Fatalf("failed to create topic: %v", err)
+	}
+	fmt.Printf("Topic created: %s\n", topicID)
+	return client
+}
+
+func TestPublish(t *testing.T) {
+	c := setup(t)
+	reporter, err := NewReporter(Client(c), Topic(topicID))
+	if err != nil {
+		t.Errorf("failed creating reporter: %v", err)
+	}
+	span := makeNewSpan("avg1", 124, 457, 0, true)
+	reporter.Send(*span)
+
+	// Cleanup resources from the previous failed tests.
+	once.Do(func() {
+		ctx := context.Background()
+		topic := c.Topic(topicID)
+		ok, err := topic.Exists(ctx)
+		if err != nil {
+			t.Fatalf("failed to check if topic exists: %v", err)
+		}
+		if !ok {
+			return
+		}
+		if err := topic.Delete(ctx); err != nil {
+			t.Fatalf("failed to cleanup the topic (%q): %v", topicID, err)
+		}
+	})
+}
+
+func makeNewSpan(methodName string, traceID, spanID, parentSpanID uint64, debug bool) *model.SpanModel {
+	timestamp := time.Now()
+	var parentID = new(model.ID)
+	if parentSpanID != 0 {
+		*parentID = model.ID(parentSpanID)
+	}
+
+	return &model.SpanModel{
+		SpanContext: model.SpanContext{
+			TraceID:  model.TraceID{Low: traceID},
+			ID:       model.ID(spanID),
+			ParentID: parentID,
+			Debug:    debug,
+		},
+		Name:      methodName,
+		Timestamp: timestamp,
+	}
+}