Creates a new object for connecting to the Pub/Sub service.
Each call creates a new connection.
For more information on connecting to Google Cloud see the
Authentication Guide.
Parameters
project_id (String) — Project identifier for the Pub/Sub service you
are connecting to. If not present, the default project for the
credentials is used.
credentials (String, Hash, Google::Auth::Credentials) — The path to
the keyfile as a String, the contents of the keyfile as a Hash, or a
Google::Auth::Credentials object.
(See PubSub::Credentials)
scope (String, Array<String>) (defaults to: nil) —
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[],[],null,["# Cloud Pub/Sub API - Module Google::Cloud (v3.0.2)\n\nVersion latestkeyboard_arrow_down\n\n- [3.0.2 (latest)](/ruby/docs/reference/google-cloud-pubsub/latest/Google-Cloud)\n- [3.0.1](/ruby/docs/reference/google-cloud-pubsub/3.0.1/Google-Cloud)\n- [2.23.0](/ruby/docs/reference/google-cloud-pubsub/2.23.0/Google-Cloud)\n- [2.22.0](/ruby/docs/reference/google-cloud-pubsub/2.22.0/Google-Cloud)\n- [2.21.0](/ruby/docs/reference/google-cloud-pubsub/2.21.0/Google-Cloud)\n- [2.20.0](/ruby/docs/reference/google-cloud-pubsub/2.20.0/Google-Cloud)\n- [2.19.0](/ruby/docs/reference/google-cloud-pubsub/2.19.0/Google-Cloud)\n- [2.18.1](/ruby/docs/reference/google-cloud-pubsub/2.18.1/Google-Cloud)\n- [2.17.0](/ruby/docs/reference/google-cloud-pubsub/2.17.0/Google-Cloud)\n- [2.16.0](/ruby/docs/reference/google-cloud-pubsub/2.16.0/Google-Cloud)\n- [2.15.5](/ruby/docs/reference/google-cloud-pubsub/2.15.5/Google-Cloud)\n- [2.14.0](/ruby/docs/reference/google-cloud-pubsub/2.14.0/Google-Cloud)\n- [2.12.1](/ruby/docs/reference/google-cloud-pubsub/2.12.1/Google-Cloud)\n- [2.11.0](/ruby/docs/reference/google-cloud-pubsub/2.11.0/Google-Cloud)\n- [2.10.0](/ruby/docs/reference/google-cloud-pubsub/2.10.0/Google-Cloud)\n- [2.9.2](/ruby/docs/reference/google-cloud-pubsub/2.9.2/Google-Cloud) \nReference documentation and code samples for the Cloud Pub/Sub API module Google::Cloud.\n\nMethods\n-------\n\n### .pubsub\n\n def self.pubsub(project_id = nil, credentials = nil, scope: nil, timeout: nil) -\u003e Google::Cloud::PubSub::Project\n\nCreates a new object for connecting to the Pub/Sub service.\nEach call creates a new connection.\n\n\n\u003cbr /\u003e\n\nFor more information on connecting to Google Cloud see the\n[Authentication Guide](./AUTHENTICATION \"Authentication Guide\"). \n**Parameters**\n\n- **project_id** (String) --- Project identifier for the Pub/Sub service you are connecting to. If not present, the default project for the credentials is used.\n- **credentials** (String, Hash, Google::Auth::Credentials) --- The path to the keyfile as a String, the contents of the keyfile as a Hash, or a Google::Auth::Credentials object. (See [PubSub::Credentials](/ruby/docs/reference/google-cloud-pubsub/latest/Google-Cloud-PubSub-Credentials \"Google::Cloud::PubSub::Credentials (class)\"))\n- **scope** (String, Array\\\u003cString\\\u003e) *(defaults to: nil)* ---\n\n The OAuth 2.0 scopes controlling the\n set of resources and operations that the connection can access. See\n [Using OAuth 2.0 to Access Google\n APIs](https://developers.google.com/identity/protocols/OAuth2).\n\n The default scope is:\n - `https://www.googleapis.com/auth/pubsub`\n- **timeout** (Numeric) *(defaults to: nil)* --- Default timeout to use in requests. Optional. \n**Returns**\n\n- ([Google::Cloud::PubSub::Project](./Google-Cloud-PubSub-Project))\n**Example** \n\n```ruby\nrequire \"google/cloud\"\n\npubsub = Google::Cloud.pubsub\n\npublisher = pubsub.publisher \"my-topic\"\npublisher.publish \"task completed\"\n```\n\n### #pubsub\n\n def pubsub(scope: nil, timeout: nil) -\u003e Google::Cloud::PubSub::Project\n\nCreates a new object for connecting to the Pub/Sub service.\nEach call creates a new connection.\n\n\n\u003cbr /\u003e\n\nFor more information on connecting to Google Cloud see the\n[Authentication Guide](./AUTHENTICATION \"Authentication Guide\"). \n**Parameters**\n\n- **scope** (String, Array\\\u003cString\\\u003e) *(defaults to: nil)* ---\n\n The OAuth 2.0 scopes controlling the\n set of resources and operations that the connection can access. See\n [Using OAuth 2.0 to Access Google\n APIs](https://developers.google.com/identity/protocols/OAuth2).\n\n The default scope is:\n - `https://www.googleapis.com/auth/pubsub`\n- **timeout** (Numeric) *(defaults to: nil)* --- Default timeout to use in requests. Optional. \n**Returns**\n\n- ([Google::Cloud::PubSub::Project](./Google-Cloud-PubSub-Project))\n**Examples** \n\n```ruby\nrequire \"google/cloud\"\n\ngcloud = Google::Cloud.new\npubsub = gcloud.pubsub\ntopic_admin = pubsub.topic_admin\npublisher = pubsub.publisher \"my-topic\"\npublisher.publish \"task completed\"\n```\n\nThe default scope can be overridden with the `scope` option: \n\n```ruby\nrequire \"google/cloud\"\n\ngcloud = Google::Cloud.new\nplatform_scope = \"https://www.googleapis.com/auth/cloud-platform\"\npubsub = gcloud.pubsub scope: platform_scope\n```\n\nConstants\n---------\n\n### Pubsub\n\n**value:** PubSub \nLegacy veneer namespace"]]
