google-cloud-pubsub

Google Cloud Pub/Sub (docs) is designed to provide reliable, many-to-many, asynchronous messaging between applications. Publisher applications can send messages to a “topic” and other applications can subscribe to that topic to receive the messages. By decoupling senders and receivers, Google Cloud Pub/Sub allows developers to communicate between independently written applications.

• google-cloud-pubsub API documentation
• google-cloud-pubsub on RubyGems
• Google Cloud Pub/Sub documentation

Quick Start

$ gem install google-cloud-pubsub

Authentication

This library uses Service Account credentials to connect to Google Cloud services. When running on Compute Engine the credentials will be discovered automatically. When running on other environments the Service Account credentials can be specified by providing the path to the JSON file, or the JSON itself, in environment variables.

Instructions and configuration options are covered in the Authentication Guide.

Example

require "google/cloud/pubsub"

pubsub = Google::Cloud::Pubsub.new(
  project: "my-project",
  keyfile: "/path/to/keyfile.json"
)

# Retrieve a topic
topic = pubsub.topic "my-topic"

# Publish a new message
msg = topic.publish "new-message"

# Retrieve a subscription
sub = pubsub.subscription "my-topic-sub"

# Create a subscriber to listen for available messages
subscriber = sub.listen do |received_message|
  # process message
  received_message.acknowledge!
end

# Start background threads that will call the block passed to listen.
subscriber.start

# Shut down the subscriber when ready to stop receiving messages.
subscriber.stop.wait!

Supported Ruby Versions

This library is supported on Ruby 2.0+.

Versioning

This library follows Semantic Versioning.

It is currently in major version zero (0.y.z), which means that anything may change at any time and the public API should not be considered stable.

Contributing

Contributions to this library are always welcome and highly encouraged.

See the Contributing Guide for more information on how to get started.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms. See Code of Conduct for more information.

License

This library is licensed under Apache 2.0. Full license text is available in LICENSE.

Support

Please report bugs at the project on Github. Don't hesitate to ask questions about the client or APIs on StackOverflow.