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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| // Unless explicitly stated otherwise all files in this repository are licensed | ||
| // under the Apache License Version 2.0. | ||
| // This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| // Copyright 2016-2020 Datadog, Inc. | ||
|
|
||
| package pubsub_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "log" | ||
|
|
||
| pubsubtrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/cloud.google.com/go/pubsub.v1" | ||
|
|
||
| "cloud.google.com/go/pubsub" | ||
| ) | ||
|
|
||
| func ExamplePublish() { | ||
| client, err := pubsub.NewClient(context.Background(), "project-id") | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
|
|
||
| topic := client.Topic("topic") | ||
| _, err = pubsubtrace.Publish(context.Background(), topic, &pubsub.Message{Data: []byte("hello world!")}).Get(context.Background()) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
|
|
||
| func ExampleReceive() { | ||
| client, err := pubsub.NewClient(context.Background(), "project-id") | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
|
|
||
| sub := client.Subscription("subscription") | ||
| err = sub.Receive(context.Background(), pubsubtrace.WrapReceiveHandler(sub, func(ctx context.Context, msg *pubsub.Message) { | ||
| // TODO: Handle message. | ||
| })) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // Unless explicitly stated otherwise all files in this repository are licensed | ||
| // under the Apache License Version 2.0. | ||
| // This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| // Copyright 2016-2020 Datadog, Inc. | ||
|
|
||
| // Package pubsub provides functions to trace the cloud.google.com/pubsub/go package. | ||
| package pubsub | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
|
|
||
| "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext" | ||
| "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer" | ||
| "gopkg.in/DataDog/dd-trace-go.v1/internal/log" | ||
|
|
||
| "cloud.google.com/go/pubsub" | ||
| ) | ||
|
|
||
| // Publish publishes a message on the specified topic and returns a PublishResult. | ||
| // This function is functionally equivalent to t.Publish(ctx, msg), but it also starts a publish | ||
| // span and it ensures that the tracing metadata is propagated as attributes attached to | ||
| // the published message. | ||
| // It is required to call (*PublishResult).Get(ctx) on the value returned by Publish to complete | ||
| // the span. | ||
| func Publish(ctx context.Context, t *pubsub.Topic, msg *pubsub.Message) *PublishResult { | ||
| span, ctx := tracer.StartSpanFromContext( | ||
| ctx, | ||
| "pubsub.publish", | ||
| tracer.ResourceName(t.String()), | ||
| tracer.SpanType(ext.SpanTypeMessageProducer), | ||
| tracer.Tag("message_size", len(msg.Data)), | ||
| tracer.Tag("ordering_key", msg.OrderingKey), | ||
| ) | ||
| if msg.Attributes == nil { | ||
| msg.Attributes = make(map[string]string) | ||
| } | ||
| if err := tracer.Inject(span.Context(), tracer.TextMapCarrier(msg.Attributes)); err != nil { | ||
| log.Debug("contrib/cloud.google.com/go/pubsub.v1/: failed injecting tracing attributes: %v", err) | ||
| } | ||
| span.SetTag("num_attributes", len(msg.Attributes)) | ||
| return &PublishResult{ | ||
| PublishResult: t.Publish(ctx, msg), | ||
| span: span, | ||
| } | ||
| } | ||
|
|
||
| // PublishResult wraps *pubsub.PublishResult | ||
| type PublishResult struct { | ||
| *pubsub.PublishResult | ||
| once sync.Once | ||
| span tracer.Span | ||
| } | ||
|
|
||
| // Get wraps (pubsub.PublishResult).Get(ctx). When this function returns the publish | ||
| // span created in Publish is completed. | ||
| func (r *PublishResult) Get(ctx context.Context) (string, error) { | ||
| serverID, err := r.PublishResult.Get(ctx) | ||
| r.once.Do(func() { | ||
| r.span.SetTag("server_id", serverID) | ||
| r.span.Finish(tracer.WithError(err)) | ||
| }) | ||
| return serverID, err | ||
| } | ||
|
|
||
| // WrapReceiveHandler returns a receive handler that wraps the supplied handler, | ||
| // extracts any tracing metadata attached to the received message, and starts a | ||
| // receive span. | ||
| func WrapReceiveHandler(s *pubsub.Subscription, f func(context.Context, *pubsub.Message)) func(context.Context, *pubsub.Message) { | ||
| return func(ctx context.Context, msg *pubsub.Message) { | ||
| parentSpanCtx, _ := tracer.Extract(tracer.TextMapCarrier(msg.Attributes)) | ||
| span, ctx := tracer.StartSpanFromContext( | ||
| ctx, | ||
| "pubsub.receive", | ||
| tracer.ResourceName(s.String()), | ||
| tracer.SpanType(ext.SpanTypeMessageConsumer), | ||
| tracer.Tag("message_size", len(msg.Data)), | ||
| tracer.Tag("num_attributes", len(msg.Attributes)), | ||
| tracer.Tag("ordering_key", msg.OrderingKey), | ||
| tracer.Tag("message_id", msg.ID), | ||
| tracer.Tag("publish_time", msg.PublishTime.String()), | ||
| tracer.ChildOf(parentSpanCtx), | ||
| ) | ||
| if msg.DeliveryAttempt != nil { | ||
| span.SetTag("delivery_attempt", *msg.DeliveryAttempt) | ||
| } | ||
| defer span.Finish() | ||
| f(ctx, msg) | ||
| } | ||
| } |
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