NewSubscription generates a new Subscritpion for a given project and subscription name.

NewTopic generates a new Topic for a given project and topic name.

MaxACKDeadline is the maximum acknowledgement deadline that can be applied to a leased subscription Message.

MaxProjectMessagesPerSecond is the maximum number of requests per second, across the entire project.

MaxPublishRequestBytes is the maximum size of a single publish request in bytes, as determined by the PubSub service.

MaxPublishRequestCount is the maximum PubSub batch size.

PublisherScopes is the set of OAuth2 scopes needed for a publisher to publish messages.

SubscriberScopes is the set of OAuth2 scopes needed for a subscriber to pull and acknowledge messages.

UnbufferedPublisher directly instantiates a Pub/Sub client and publishes a message to it.

ClientFactory is passed into an UnbufferedPublisher to create or reset a client.

Publisher is a generic interface to something that can publish Pub/Sub messages.

Subscription is a Pub/Sub subscription name.

Topic is a fully-qualified Pub/Sub project/topic name.