@google-cloud/pubsub

Cloud Pub/Sub Client Library for Node.js

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Readme

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Google Cloud Pub/Sub: Node.js Client

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Cloud Pub/Sub is a fully-managed real-time messaging service that allows you to send and receive messages between independent applications.

This document contains links to an API reference, samples, and other resources useful to developing Node.js applications. For additional help developing Pub/Sub applications, in Node.js and other languages, see our Pub/Sub quickstart, publisher, and subscriber guides.

A comprehensive list of changes in each version may be found in the CHANGELOG.

Read more about the client libraries for Cloud APIs, including the older Google APIs Client Libraries, in Client Libraries Explained.

Table of contents:

Quickstart

Before you begin

  1. Select or create a Cloud Platform project.
  2. Enable billing for your project.
  3. Enable the Google Cloud Pub/Sub API.
  4. Set up authentication with a service account so you can access the API from your local workstation.

Installing the client library

npm install @google-cloud/pubsub

Using the client library

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

async function quickstart(
  projectId = 'your-project-id', // Your Google Cloud Platform project ID
  topicName = 'my-topic', // Name for the new topic to create
  subscriptionName = 'my-sub' // Name for the new subscription to create
) {
  // Instantiates a client
  const pubsub = new PubSub({projectId});

  // Creates a new topic
  const [topic] = await pubsub.createTopic(topicName);
  console.log(`Topic ${topic.name} created.`);

  // Creates a subscription on that new topic
  const [subscription] = await topic.createSubscription(subscriptionName);

  // Receive callbacks for new messages on the subscription
  subscription.on('message', message => {
    console.log('Received message:', message.data.toString());
    process.exit(0);
  });

  // Receive callbacks for errors on the subscription
  subscription.on('error', error => {
    console.error('Received error:', error);
    process.exit(1);
  });

  // Send a message to the topic
  topic.publish(Buffer.from('Test message!'));
}

Running gRPC C++ bindings

For some workflows and environments it might make sense to use the C++ gRPC implementation, instead of the default one (see: #770):

To configure @google-cloud/pubsub to use an alternative grpc transport:

  1. npm install grpc, adding grpc as a dependency.

  2. instantiate @google-cloud/pubsub with grpc:

    const {PubSub} = require('@google-cloud/pubsub');
    const grpc = require('grpc');
    const pubsub = new PubSub({grpc});
    

Samples

Samples are in the samples/ directory. Each sample's README.md has instructions for running its sample.

Sample Source Code Try it
Create an Avro based Schema source code Open in Cloud Shell
Create a Proto based Schema source code Open in Cloud Shell
Create Push Subscription source code Open in Cloud Shell
Create Subscription source code Open in Cloud Shell
Create Subscription With Dead Letter Policy source code Open in Cloud Shell
Create Subscription with ordering enabled source code Open in Cloud Shell
Create Topic source code Open in Cloud Shell
Create Topic With Schema source code Open in Cloud Shell
Delete a previously created schema source code Open in Cloud Shell
Delete Subscription source code Open in Cloud Shell
Delete Topic source code Open in Cloud Shell
Detach Subscription source code Open in Cloud Shell
Get a previously created schema source code Open in Cloud Shell
Get Subscription source code Open in Cloud Shell
Get Subscription Policy source code Open in Cloud Shell
Get Topic Policy source code Open in Cloud Shell
List All Topics source code Open in Cloud Shell
List schemas on a project source code Open in Cloud Shell
List Subscriptions source code Open in Cloud Shell
List Subscriptions On a Topic source code Open in Cloud Shell
Listen For Avro Records source code Open in Cloud Shell
Listen For Errors source code Open in Cloud Shell
Listen For Messages source code Open in Cloud Shell
Listen For Protobuf Messages source code Open in Cloud Shell
Listen For Messages With Custom Attributes source code Open in Cloud Shell
Modify Push Configuration source code Open in Cloud Shell
OpenTelemetry Tracing source code Open in Cloud Shell
Publish Avro Records to a Topic source code Open in Cloud Shell
Publish Batched Messages source code Open in Cloud Shell
Publish Message source code Open in Cloud Shell
Publish Message With Custom Attributes source code Open in Cloud Shell
Publish Ordered Message source code Open in Cloud Shell
Publish Protobuf Messages to a Topic source code Open in Cloud Shell
Publish With Retry Settings source code Open in Cloud Shell
Quickstart source code Open in Cloud Shell
Remove Dead Letter Policy source code Open in Cloud Shell
Resume Publish source code Open in Cloud Shell
Set Subscription IAM Policy source code Open in Cloud Shell
Set Topic IAM Policy source code Open in Cloud Shell
Subscribe With Flow Control Settings source code Open in Cloud Shell
Synchronous Pull source code Open in Cloud Shell
Synchronous Pull with delivery attempt. source code Open in Cloud Shell
Synchronous Pull With Lease Management source code Open in Cloud Shell
Test Subscription Permissions source code Open in Cloud Shell
Test Topic Permissions source code Open in Cloud Shell
Update Dead Letter Policy source code Open in Cloud Shell

The Google Cloud Pub/Sub Node.js Client API Reference documentation also contains samples.

Supported Node.js Versions

Our client libraries follow the Node.js release schedule. Libraries are compatible with all current active and maintenance versions of Node.js.

Client libraries targeting some end-of-life versions of Node.js are available, and can be installed via npm dist-tags. The dist-tags follow the naming convention legacy-(version).

Legacy Node.js versions are supported as a best effort:

  • Legacy versions will not be tested in continuous integration.
  • Some security patches may not be able to be backported.
  • Dependencies will not be kept up-to-date, and features will not be backported.

Legacy tags available

  • legacy-8: install client libraries from this dist-tag for versions compatible with Node.js 8.

Versioning

This library follows Semantic Versioning.

This library is considered to be General Availability (GA). This means it is stable; the code surface will not change in backwards-incompatible ways unless absolutely necessary (e.g. because of critical security issues) or with an extensive deprecation period. Issues and requests against GA libraries are addressed with the highest priority.

More Information: Google Cloud Platform Launch Stages

Contributing

Contributions welcome! See the Contributing Guide.

Please note that this README.md, the samples/README.md, and a variety of configuration files in this repository (including .nycrc and tsconfig.json) are generated from a central template. To edit one of these files, make an edit to its template in this directory.

License

Apache Version 2.0

See LICENSE

If you find any bugs or have a feature request, please open an issue on github!

The npm package download data comes from npm's download counts api and package details come from npms.io.