pubsub

Documentation

Overview

Package pubsub provides functions to trace the cloud.google.com/pubsub/go package.

Index

• func WrapReceiveHandler(s *pubsub.Subscription, f func(context.Context, *pubsub.Message), ...) func(context.Context, *pubsub.Message)
• type PublishResult
  • func Publish(ctx context.Context, t *pubsub.Topic, msg *pubsub.Message) *PublishResult
  • func (r *PublishResult) Get(ctx context.Context) (string, error)
• type ReceiveOption
  • func WithServiceName(serviceName string) ReceiveOption

Examples

• Publish

Functions

func WrapReceiveHandler

func WrapReceiveHandler(s *pubsub.Subscription, f func(context.Context, *pubsub.Message), opts ...ReceiveOption) func(context.Context, *pubsub.Message)

WrapReceiveHandler returns a receive handler that wraps the supplied handler, extracts any tracing metadata attached to the received message, and starts a receive span.

Types

type PublishResult

type PublishResult struct {
	*pubsub.PublishResult
	// contains filtered or unexported fields
}

PublishResult wraps *pubsub.PublishResult

func Publish

func Publish(ctx context.Context, t *pubsub.Topic, msg *pubsub.Message) *PublishResult

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.

Example

package main

import (
	"context"
	"log"

	pubsubtrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/cloud.google.com/go/pubsub.v1"

	"cloud.google.com/go/pubsub"
)

func main() {
	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 (*PublishResult) Get

func (r *PublishResult) Get(ctx context.Context) (string, error)

Get wraps (pubsub.PublishResult).Get(ctx). When this function returns the publish span created in Publish is completed.

type ReceiveOption

type ReceiveOption func(cfg *config)

A ReceiveOption is used to customize spans started by WrapReceiveHandler.

func WithServiceName

func WithServiceName(serviceName string) ReceiveOption

WithServiceName sets the service name tag for traces started by WrapReceiveHandler.