Class Client (0.45.0)

Client(batch_settings=(), **kwargs)

A publisher client for Google Cloud Pub/Sub.

This creates an object that is capable of publishing messages. Generally, you can instantiate this client with no arguments, and you get sensible defaults.

Parameters
Name	Description
`kwargs`	`dict` Any additional arguments provided are sent as keyword arguments to the underlying `.gapic.pubsub.v1.publisher_client.PublisherClient`. Generally, you should not need to set additional keyword arguments. Before being passed along to the GAPIC constructor, a channel may be added if `credentials` are passed explicitly or if the Pub / Sub emulator is detected as running. Regional endpoints can be set via `client_options` that takes a single key-value pair that defines the endpoint, i.e. `client_options={"api_endpoint": REGIONAL_ENDPOINT}`.
`batch_settings`	`BatchSettings` The settings for batch publishing.

Properties

target

Return the target (where the API is).

Returns
Type	Description
`str`	The location of the API.

Methods

create_topic

create_topic(name, labels=None, message_storage_policy=None, kms_key_name=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Creates the given topic with the given name. See the resource name rules.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

name = client.topic_path('[PROJECT]', '[TOPIC]')

response = client.create_topic(name)

Parameters
Name	Description
`name`	`str` The name of the topic. It must have the format `"projects/{project}/topics/{topic}"`. `{topic}` must start with a letter, and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (``<code>), plus (</code>+<code>) or percent signs (</code>%<code>). It must be between 3 and 255 characters in length, and it must not start with </code>"goog".
`labels`	`dict[str -> str]` See Creating and managing labels.
`message_storage_policy`	`Union[dict, MessageStoragePolicy]` Policy constraining how messages published to the topic may be stored. It is determined when the topic is created based on the policy configured at the project level. It must not be set by the caller in the request to CreateTopic or to UpdateTopic. This field will be populated in the responses for GetTopic, CreateTopic, and UpdateTopic: if not present in the response, then no constraints are in effect. If a dict is provided, it must be of the same form as the protobuf message MessageStoragePolicy
`kms_key_name`	`str` The resource name of the Cloud KMS CryptoKey to be used to protect access to messages published on this topic. The expected format is `projects//locations//keyRings//cryptoKeys/`. EXPERIMENTAL: This feature is part of a closed alpha release. This API might be changed in backward-incompatible ways and is not recommended for production use. It is not subject to any SLA or deprecation policy.
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

delete_topic

delete_topic(topic, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Deletes the topic with the given name. Returns NOT_FOUND if the topic does not exist. After a topic is deleted, a new topic may be created with the same name; this is an entirely new topic with none of the old configuration or subscriptions. Existing subscriptions to this topic are not deleted, but their topic field is set to _deleted-topic_.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

topic = client.topic_path('[PROJECT]', '[TOPIC]')

client.delete_topic(topic)

Parameters
Name	Description
`topic`	`str` Name of the topic to delete. Format is `projects/{project}/topics/{topic}`.
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

from_service_account_file

from_service_account_file(filename, batch_settings=(), **kwargs)

Creates an instance of this client using the provided credentials file.

Parameters
Name	Description
`filename`	`str` The path to the service account private key json file.
`batch_settings`	`BatchSettings` The settings for batch publishing.

Returns
Type	Description
`PublisherClient`	The constructed client.

from_service_account_json

from_service_account_json(filename, batch_settings=(), **kwargs)

Creates an instance of this client using the provided credentials file.

Parameters
Name	Description
`filename`	`str` The path to the service account private key json file.
`batch_settings`	`BatchSettings` The settings for batch publishing.

Returns
Type	Description
`PublisherClient`	The constructed client.

get_iam_policy

get_iam_policy(resource, options_=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Gets the access control policy for a resource. Returns an empty policy if the resource exists and does not have a policy set.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

resource = client.topic_path('[PROJECT]', '[TOPIC]')

response = client.get_iam_policy(resource)

Parameters
Name	Description
`resource`	`str` REQUIRED: The resource for which the policy is being requested. See the operation documentation for the appropriate value for this field.
`options_`	`Union[dict, GetPolicyOptions]` OPTIONAL: A `GetPolicyOptions` object for specifying options to `GetIamPolicy`. This field is only used by Cloud IAM. If a dict is provided, it must be of the same form as the protobuf message GetPolicyOptions
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

get_topic

get_topic(topic, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Gets the configuration of a topic.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

topic = client.topic_path('[PROJECT]', '[TOPIC]')

response = client.get_topic(topic)

Parameters
Name	Description
`topic`	`str` The name of the topic to get. Format is `projects/{project}/topics/{topic}`.
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

list_topic_subscriptions

list_topic_subscriptions(topic, page_size=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Lists the names of the subscriptions on this topic.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

topic = client.topic_path('[PROJECT]', '[TOPIC]')

Iterate over all results

for element in client.list_topic_subscriptions(topic): ... # process element ... pass

Alternatively:

Iterate over results one page at a time

for page in client.list_topic_subscriptions(topic).pages: ... for element in page: ... # process element ... pass

Parameters
Name	Description
`topic`	`str` The name of the topic that subscriptions are attached to. Format is `projects/{project}/topics/{topic}`.
`page_size`	`int` The maximum number of resources contained in the underlying API response. If page streaming is performed per- resource, this parameter does not affect the return value. If page streaming is performed per-page, this determines the maximum number of resources in a page.
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

list_topics

list_topics(project, page_size=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Lists matching topics.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

project = client.project_path('[PROJECT]')

Iterate over all results

for element in client.list_topics(project): ... # process element ... pass

Alternatively:

Iterate over results one page at a time

for page in client.list_topics(project).pages: ... for element in page: ... # process element ... pass

Parameters
Name	Description
`project`	`str` The name of the project in which to list topics. Format is `projects/{project-id}`.
`page_size`	`int` The maximum number of resources contained in the underlying API response. If page streaming is performed per- resource, this parameter does not affect the return value. If page streaming is performed per-page, this determines the maximum number of resources in a page.
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

project_path

project_path(project)

Return a fully-qualified project string.

publish

publish(topic, data, **attrs)

Publish a single message.

Note: Messages in Pub/Sub are blobs of bytes. They are binary data, not text. You must send data as a bytestring (bytes in Python 3; str in Python 2), and this library will raise an exception if you send a text string.

The reason that this is so important (and why we do not try to coerce for you) is because Pub/Sub is also platform independent and there is no way to know how to decode messages properly on the other side; therefore, encoding and decoding is a required exercise for the developer.

Add the given message to this object; this will cause it to be published once the batch either has enough messages or a sufficient period of time has elapsed.

.. rubric:: Example

from google.cloud import pubsub_v1 client = pubsub_v1.PublisherClient() topic = client.topic_path('[PROJECT]', '[TOPIC]') data = b'The rain in Wales falls mainly on the snails.' response = client.publish(topic, data, username='guido')

Parameters
Name	Description
`attrs`	`Mapping[str, str]` A dictionary of attributes to be sent as metadata. (These may be text strings or byte strings.)
`topic`	`str` The topic to publish messages to.
`data`	`bytes` A bytestring representing the message body. This must be a bytestring.

Returns
Type	Description
`google.api_core.future.Future`	An object conforming to the `concurrent.futures.Future` interface (but not an instance of that class).

set_iam_policy

set_iam_policy(resource, policy, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Sets the access control policy on the specified resource. Replaces any existing policy.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

resource = client.topic_path('[PROJECT]', '[TOPIC]')

TODO: Initialize policy:

policy = {}

response = client.set_iam_policy(resource, policy)

Parameters
Name	Description
`resource`	`str` REQUIRED: The resource for which the policy is being specified. See the operation documentation for the appropriate value for this field.
`policy`	`Union[dict, Policy]` REQUIRED: The complete policy to be applied to the `resource`. The size of the policy is limited to a few 10s of KB. An empty policy is a valid policy but certain Cloud Platform services (such as Projects) might reject them. If a dict is provided, it must be of the same form as the protobuf message Policy
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

test_iam_permissions

test_iam_permissions(resource, permissions, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Returns permissions that a caller has on the specified resource. If the resource does not exist, this will return an empty set of permissions, not a NOT_FOUND error.

Note: This operation is designed to be used for building permission-aware UIs and command-line tools, not for authorization checking. This operation may "fail open" without warning.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

resource = client.topic_path('[PROJECT]', '[TOPIC]')

TODO: Initialize permissions:

permissions = []

response = client.test_iam_permissions(resource, permissions)

Parameters
Name	Description
`resource`	`str` REQUIRED: The resource for which the policy detail is being requested. See the operation documentation for the appropriate value for this field.
`permissions`	`list[str]` The set of permissions to check for the `resource`. Permissions with wildcards (such as '' or 'storage.') are not allowed. For more information see `IAM Overview https://cloud.google.com/iam/docs/overview#permissions`__.
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

topic_path

topic_path(project, topic)

Return a fully-qualified topic string.

update_topic

update_topic(topic, update_mask, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)

Updates an existing topic. Note that certain properties of a topic are not modifiable.

.. rubric:: Example

from google.cloud import pubsub_v1

client = pubsub_v1.PublisherClient()

TODO: Initialize topic:

topic = {}

TODO: Initialize update_mask:

update_mask = {}

response = client.update_topic(topic, update_mask)

Parameters
Name	Description
`topic`	`Union[dict, Topic]` The updated topic object. If a dict is provided, it must be of the same form as the protobuf message Topic
`update_mask`	`Union[dict, FieldMask]` Indicates which fields in the provided topic to update. Must be specified and non-empty. Note that if `update_mask` contains "message_storage_policy" then the new value will be determined based on the policy configured at the project or organization level. The `message_storage_policy` must not be set in the `topic` provided above. If a dict is provided, it must be of the same form as the protobuf message FieldMask
`retry`	`Optional[google.api_core.retry.Retry]` A retry object used to retry requests. If `None` is specified, requests will not be retried.
`timeout`	`Optional[float]` The amount of time, in seconds, to wait for the request to complete. Note that if `retry` is specified, the timeout applies to each individual attempt.
`metadata`	`Optional[Sequence[Tuple[str, str]]]` Additional metadata that is provided to the method.

Exceptions
Type	Description
`google.api_core.exceptions.GoogleAPICallError`	If the request failed for any reason.
`google.api_core.exceptions.RetryError`	If the request failed due to a retryable error and retry attempts failed.
`ValueError`	If the parameters are invalid.

Class Client (0.45.0)

Parameters

Properties

target

Methods

create_topic

delete_topic

from_service_account_file

from_service_account_json

get_iam_policy

get_topic

list_topic_subscriptions

Iterate over all results

Alternatively:

Iterate over results one page at a time

list_topics

Iterate over all results

Alternatively:

Iterate over results one page at a time

project_path

publish

set_iam_policy

TODO: Initialize `policy`:

test_iam_permissions

TODO: Initialize `permissions`:

topic_path

update_topic

TODO: Initialize `topic`:

TODO: Initialize `update_mask`:

Class Client (0.45.0)

Parameters

Properties

target

Methods

create_topic

delete_topic

from_service_account_file

from_service_account_json

get_iam_policy

get_topic

list_topic_subscriptions

Iterate over all results

Alternatively:

Iterate over results one page at a time

list_topics

Iterate over all results

Alternatively:

Iterate over results one page at a time

project_path

publish

set_iam_policy

TODO: Initialize policy:

test_iam_permissions

TODO: Initialize permissions:

topic_path

update_topic

TODO: Initialize topic:

TODO: Initialize update_mask:

TODO: Initialize `policy`:

TODO: Initialize `permissions`:

TODO: Initialize `topic`:

TODO: Initialize `update_mask`: