Class Client (2.1.0)

Client(**kwargs)

A subscriber client for Google Cloud Pub/Sub.

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

Parameter

Name Description

kwargs

dict Example: .. code-block:: python from google.cloud import pubsub_v1 subscriber_client = pubsub_v1.SubscriberClient( # Optional client_options = { "api_endpoint": REGIONAL_ENDPOINT } )

Any additional arguments provided are sent as keyword keyword arguments to the underlying SubscriberClient. Generally you should not need to set additional keyword arguments. Optionally, regional endpoints can be set via client_options that takes a single key-value pair that defines the endpoint.

Inheritance

builtins.object > Client

Properties

api

The underlying gapic API client.

target

Return the target (where the API is).

Returns

Type	Description
str	The location of the API.

Methods

acknowledge

acknowledge(request: google.cloud.pubsub_v1.types.AcknowledgeRequest = None, *, subscription: str = None, ack_ids: Sequence[str] = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Acknowledges the messages associated with the ack_ids in the AcknowledgeRequest. The Pub/Sub system can remove the relevant messages from the subscription.

Acknowledging a message whose ack deadline has expired may succeed, but such a message may be redelivered later. Acknowledging a message more than once will not result in an error.

Parameters

Name	Description
request	`.pubsub.AcknowledgeRequest` The request object. Request for the Acknowledge method.
subscription	`str` Required. The subscription whose message is being acknowledged. Format is `projects/{project}/subscriptions/{sub}`. This corresponds to the `subscription` field on the `request` instance; if `request` is provided, this should not be set.
ack_ids	:class:`Sequence[str]` Required. The acknowledgment ID for the messages being acknowledged that was returned by the Pub/Sub system in the `Pull` response. Must not be empty. This corresponds to the `ack_ids` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

close

close()

Close the underlying channel to release socket resources.

After a channel has been closed, the client instance cannot be used anymore.

This method is idempotent.

create_snapshot

create_snapshot(request: google.cloud.pubsub_v1.types.CreateSnapshotRequest = None, *, name: str = None, subscription: str = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Creates a snapshot from the requested subscription. Snapshots are used in Seek <https://cloud.google.com/pubsub/docs/replay-overview>__ operations, which allow you to manage message acknowledgments in bulk. That is, you can set the acknowledgment state of messages in an existing subscription to the state captured by a snapshot. If the snapshot already exists, returns ALREADY_EXISTS. If the requested subscription doesn't exist, returns NOT_FOUND. If the backlog in the subscription is too old -- and the resulting snapshot would expire in less than 1 hour -- then FAILED_PRECONDITION is returned. See also the Snapshot.expire_time field. If the name is not provided in the request, the server will assign a random name for this snapshot on the same project as the subscription, conforming to the resource name format. The generated name is populated in the returned Snapshot object. Note that for REST API requests, you must specify a name in the request.

Parameters

Name	Description
request	`.pubsub.CreateSnapshotRequest` The request object. Request for the `CreateSnapshot` method.
name	`str` Required. User-provided name for this snapshot. If the name is not provided in the request, the server will assign a random name for this snapshot on the same project as the subscription. Note that for REST API requests, you must specify a name. See the resource name rules. Format is `projects/{project}/snapshots/{snap}`. This corresponds to the `name` field on the `request` instance; if `request` is provided, this should not be set.
subscription	`str` Required. The subscription whose backlog the snapshot retains. Specifically, the created snapshot is guaranteed to retain: (a) The existing backlog on the subscription. More precisely, this is defined as the messages in the subscription's backlog that are unacknowledged upon the successful completion of the `CreateSnapshot` request; as well as: (b) Any messages published to the subscription's topic following the successful completion of the CreateSnapshot request. Format is `projects/{project}/subscriptions/{sub}`. This corresponds to the `subscription` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.Snapshot`	A snapshot resource. Snapshots are used in `Seek

create_subscription

create_subscription(request: google.cloud.pubsub_v1.types.Subscription = None, *, name: str = None, topic: str = None, push_config: google.cloud.pubsub_v1.types.PushConfig = None, ack_deadline_seconds: int = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Creates a subscription to a given topic. See the resource name rules. If the subscription already exists, returns ALREADY_EXISTS. If the corresponding topic doesn't exist, returns NOT_FOUND.

If the name is not provided in the request, the server will assign a random name for this subscription on the same project as the topic, conforming to the resource name format. The generated name is populated in the returned Subscription object. Note that for REST API requests, you must specify a name in the request.

Parameters

Name	Description
request	`.pubsub.Subscription` The request object. A subscription resource.
name	`str` Required. The name of the subscription. It must have the format `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must start with a letter, and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (````), plus (+`) or percent signs (`%`). It must be between 3 and 255 characters in length, and it must not start with`"goog"`. This corresponds to the`name`field on the`request`instance; if`request`` is provided, this should not be set.
topic	`str` Required. The name of the topic from which this subscription is receiving messages. Format is `projects/{project}/topics/{topic}`. The value of this field will be `_deleted-topic_` if the topic has been deleted. This corresponds to the `topic` field on the `request` instance; if `request` is provided, this should not be set.
push_config	`.pubsub.PushConfig` If push delivery is used with this subscription, this field is used to configure it. An empty `pushConfig` signifies that the subscriber will pull and ack messages using API methods. This corresponds to the `push_config` field on the `request` instance; if `request` is provided, this should not be set.
ack_deadline_seconds	`int` The approximate amount of time (on a best-effort basis) Pub/Sub waits for the subscriber to acknowledge receipt before resending the message. In the interval after the message is delivered and before it is acknowledged, it is considered to be outstanding. During that time period, the message will not be redelivered (on a best-effort basis). For pull subscriptions, this value is used as the initial value for the ack deadline. To override this value for a given message, call `ModifyAckDeadline` with the corresponding `ack_id` if using non-streaming pull or send the `ack_id` in a `StreamingModifyAckDeadlineRequest` if using streaming pull. The minimum custom deadline you can specify is 10 seconds. The maximum custom deadline you can specify is 600 seconds (10 minutes). If this parameter is 0, a default value of 10 seconds is used. For push delivery, this value is also used to set the request timeout for the call to the push endpoint. If the subscriber never acknowledges the message, the Pub/Sub system will eventually redeliver the message. This corresponds to the `ack_deadline_seconds` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.Subscription`	A subscription resource.

delete_snapshot

delete_snapshot(request: google.cloud.pubsub_v1.types.DeleteSnapshotRequest = None, *, snapshot: str = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Removes an existing snapshot. Snapshots are used in Seek operations, which allow you to manage message acknowledgments in bulk. That is, you can set the acknowledgment state of messages in an existing subscription to the state captured by a snapshot. When the snapshot is deleted, all messages retained in the snapshot are immediately dropped. After a snapshot is deleted, a new one may be created with the same name, but the new one has no association with the old snapshot or its subscription, unless the same subscription is specified.

Parameters

Name	Description
request	`.pubsub.DeleteSnapshotRequest` The request object. Request for the `DeleteSnapshot` method.
snapshot	`str` Required. The name of the snapshot to delete. Format is `projects/{project}/snapshots/{snap}`. This corresponds to the `snapshot` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

delete_subscription

delete_subscription(request: google.cloud.pubsub_v1.types.DeleteSubscriptionRequest = None, *, subscription: str = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Deletes an existing subscription. All messages retained in the subscription are immediately dropped. Calls to Pull after deletion will return NOT_FOUND. After a subscription is deleted, a new one may be created with the same name, but the new one has no association with the old subscription or its topic unless the same topic is specified.

Parameters

Name	Description
request	`.pubsub.DeleteSubscriptionRequest` The request object. Request for the DeleteSubscription method.
subscription	`str` Required. The subscription to delete. Format is `projects/{project}/subscriptions/{sub}`. This corresponds to the `subscription` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

from_service_account_file

from_service_account_file(filename, **kwargs)

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

Parameter

Name	Description
filename	`str` The path to the service account private key json file.

from_service_account_json

from_service_account_json(filename, **kwargs)

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

Parameter

Name	Description
filename	`str` The path to the service account private key json file.

get_iam_policy

get_iam_policy(request: google.iam.v1.iam_policy_pb2.GetIamPolicyRequest = None, *, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

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

Parameters

Name	Description
request	`.iam_policy.GetIamPolicyRequest` The request object. Request message for `GetIamPolicy` method.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type

Description

`.policy.Policy`

Defines an Identity and Access Management (IAM) policy. It is used to specify access control policies for Cloud Platform resources. A ``Policy`` is a collection of ``bindings``. A ``binding`` binds one or more ``members`` to a single ``role``. Members can be user accounts, service accounts, Google groups, and domains (such as G Suite). A ``role`` is a named list of permissions (defined by IAM or configured by users). A ``binding`` can optionally specify a ``condition``, which is a logic expression that further constrains the role binding based on attributes about the request and/or target resource. **JSON Example**:: { "bindings": [ { "role": "roles/resourcemanager.organizationAdmin", "members": [ "user:mike@example.com", "group:admins@example.com", "domain:google.com", "serviceAccount:my-project-id@appspot.gserviceaccount.com" ] }, { "role": "roles/resourcemanager.organizationViewer", "members": ["user:eve@example.com"], "condition": { "title": "expirable access", "description": "Does not grant access after Sep 2020", "expression": "request.time < timestamp('2020-10-01t00:00:00.000z')",="" }="" }="" ]="" }="" **yaml="" example**::="" bindings:="" -="" members:="" -="" user:mike@example.com="" -="" group:admins@example.com="" -="" domain:google.com="" -="" serviceaccount:my-project-id@appspot.gserviceaccount.com="" role:="" roles/resourcemanager.organizationadmin="" -="" members:="" -="" user:eve@example.com="" role:="" roles/resourcemanager.organizationviewer="" condition:="" title:="" expirable="" access="" description:="" does="" not="" grant="" access="" after="" sep="" 2020="" expression:="" request.time="">< timestamp('2020-10-01t00:00:00.000z')="" for="" a="" description="" of="" iam="" and="" its="" features,="" see="" the="" `iam="" developer's="" guide="">

get_snapshot

get_snapshot(request: google.cloud.pubsub_v1.types.GetSnapshotRequest = None, *, snapshot: str = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Gets the configuration details of a snapshot. Snapshots are used in a href="https://cloud.google.com/pubsub/docs/replay- overview"Seek operations, which allow you to manage message acknowledgments in bulk. That is, you can set the acknowledgment state of messages in an existing subscription to the state captured by a snapshot.

Parameters

Name	Description
request	`.pubsub.GetSnapshotRequest` The request object. Request for the GetSnapshot method.
snapshot	`str` Required. The name of the snapshot to get. Format is `projects/{project}/snapshots/{snap}`. This corresponds to the `snapshot` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.Snapshot`	A snapshot resource. Snapshots are used in `Seek

get_subscription

get_subscription(request: google.cloud.pubsub_v1.types.GetSubscriptionRequest = None, *, subscription: str = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Gets the configuration details of a subscription.

Parameters

Name	Description
request	`.pubsub.GetSubscriptionRequest` The request object. Request for the GetSubscription method.
subscription	`str` Required. The name of the subscription to get. Format is `projects/{project}/subscriptions/{sub}`. This corresponds to the `subscription` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.Subscription`	A subscription resource.

list_snapshots

list_snapshots(request: google.cloud.pubsub_v1.types.ListSnapshotsRequest = None, *, project: str = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Lists the existing snapshots. Snapshots are used in Seek <https://cloud.google.com/pubsub/docs/replay-overview>__ operations, which allow you to manage message acknowledgments in bulk. That is, you can set the acknowledgment state of messages in an existing subscription to the state captured by a snapshot.

Parameters

Name	Description
request	`.pubsub.ListSnapshotsRequest` The request object. Request for the `ListSnapshots` method.
project	`str` Required. The name of the project in which to list snapshots. Format is `projects/{project-id}`. This corresponds to the `project` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pagers.ListSnapshotsPager`	Response for the ``ListSnapshots`` method. Iterating over this object will yield results and resolve additional pages automatically.

list_subscriptions

list_subscriptions(request: google.cloud.pubsub_v1.types.ListSubscriptionsRequest = None, *, project: str = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Lists matching subscriptions.

Parameters

Name	Description
request	`.pubsub.ListSubscriptionsRequest` The request object. Request for the `ListSubscriptions` method.
project	`str` Required. The name of the project in which to list subscriptions. Format is `projects/{project-id}`. This corresponds to the `project` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pagers.ListSubscriptionsPager`	Response for the ``ListSubscriptions`` method. Iterating over this object will yield results and resolve additional pages automatically.

modify_ack_deadline

modify_ack_deadline(request: google.cloud.pubsub_v1.types.ModifyAckDeadlineRequest = None, *, subscription: str = None, ack_ids: Sequence[str] = None, ack_deadline_seconds: int = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Modifies the ack deadline for a specific message. This method is useful to indicate that more time is needed to process a message by the subscriber, or to make the message available for redelivery if the processing was interrupted. Note that this does not modify the subscription-level ackDeadlineSeconds used for subsequent messages.

Parameters

Name	Description
request	`.pubsub.ModifyAckDeadlineRequest` The request object. Request for the ModifyAckDeadline method.
subscription	`str` Required. The name of the subscription. Format is `projects/{project}/subscriptions/{sub}`. This corresponds to the `subscription` field on the `request` instance; if `request` is provided, this should not be set.
ack_ids	:class:`Sequence[str]` Required. List of acknowledgment IDs. This corresponds to the `ack_ids` field on the `request` instance; if `request` is provided, this should not be set.
ack_deadline_seconds	`int` Required. The new ack deadline with respect to the time this request was sent to the Pub/Sub system. For example, if the value is 10, the new ack deadline will expire 10 seconds after the `ModifyAckDeadline` call was made. Specifying zero might immediately make the message available for delivery to another subscriber client. This typically results in an increase in the rate of message redeliveries (that is, duplicates). The minimum deadline you can specify is 0 seconds. The maximum deadline you can specify is 600 seconds (10 minutes). This corresponds to the `ack_deadline_seconds` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

modify_push_config

modify_push_config(request: google.cloud.pubsub_v1.types.ModifyPushConfigRequest = None, *, subscription: str = None, push_config: google.cloud.pubsub_v1.types.PushConfig = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Modifies the PushConfig for a specified subscription.

This may be used to change a push subscription to a pull one (signified by an empty PushConfig) or vice versa, or change the endpoint URL and other attributes of a push subscription. Messages will accumulate for delivery continuously through the call regardless of changes to the PushConfig.

Parameters

Name	Description
request	`.pubsub.ModifyPushConfigRequest` The request object. Request for the ModifyPushConfig method.
subscription	`str` Required. The name of the subscription. Format is `projects/{project}/subscriptions/{sub}`. This corresponds to the `subscription` field on the `request` instance; if `request` is provided, this should not be set.
push_config	`.pubsub.PushConfig` Required. The push configuration for future deliveries. An empty `pushConfig` indicates that the Pub/Sub system should stop pushing messages from the given subscription and allow messages to be pulled and acknowledged - effectively pausing the subscription if `Pull` or `StreamingPull` is not called. This corresponds to the `push_config` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

parse_snapshot_path

parse_snapshot_path(path: str)

Parse a snapshot path into its component segments.

parse_subscription_path

parse_subscription_path(path: str)

Parse a subscription path into its component segments.

pull

pull(request: google.cloud.pubsub_v1.types.PullRequest = None, *, subscription: str = None, return_immediately: bool = None, max_messages: int = None, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Pulls messages from the server. The server may return UNAVAILABLE if there are too many concurrent pull requests pending for the given subscription.

Parameters

Name	Description
request	`.pubsub.PullRequest` The request object. Request for the `Pull` method.
subscription	`str` Required. The subscription from which messages should be pulled. Format is `projects/{project}/subscriptions/{sub}`. This corresponds to the `subscription` field on the `request` instance; if `request` is provided, this should not be set.
return_immediately	`bool` Optional. If this field set to true, the system will respond immediately even if it there are no messages available to return in the `Pull` response. Otherwise, the system may wait (for a bounded amount of time) until at least one message is available, rather than returning no messages. Warning: setting this field to `true` is discouraged because it adversely impacts the performance of `Pull` operations. We recommend that users do not set this field. This corresponds to the `return_immediately` field on the `request` instance; if `request` is provided, this should not be set.
max_messages	`int` Required. The maximum number of messages to return for this request. Must be a positive integer. The Pub/Sub system may return fewer than the number specified. This corresponds to the `max_messages` field on the `request` instance; if `request` is provided, this should not be set.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.PullResponse`	Response for the ``Pull`` method.

seek

seek(request: google.cloud.pubsub_v1.types.SeekRequest = None, *, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Seeks an existing subscription to a point in time or to a given snapshot, whichever is provided in the request. Snapshots are used in Seek <https://cloud.google.com/pubsub/docs/replay-overview>__ operations, which allow you to manage message acknowledgments in bulk. That is, you can set the acknowledgment state of messages in an existing subscription to the state captured by a snapshot. Note that both the subscription and the snapshot must be on the same topic.

Parameters

Name	Description
request	`.pubsub.SeekRequest` The request object. Request for the `Seek` method.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.SeekResponse`	Response for the ``Seek`` method (this response is empty).

set_iam_policy

set_iam_policy(request: google.iam.v1.iam_policy_pb2.SetIamPolicyRequest = None, *, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Sets the IAM access control policy on the specified function. Replaces any existing policy.

Parameters

Name	Description
request	`.iam_policy.SetIamPolicyRequest` The request object. Request message for `SetIamPolicy` method.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type

Description

`.policy.Policy`

snapshot_path

snapshot_path(project: str, snapshot: str)

Return a fully-qualified snapshot string.

streaming_pull

streaming_pull(requests: Iterator[google.cloud.pubsub_v1.types.StreamingPullRequest] = None, *, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Establishes a stream with the server, which sends messages down to the client. The client streams acknowledgements and ack deadline modifications back to the server. The server will close the stream and return the status on any error. The server may close the stream with status UNAVAILABLE to reassign server-side resources, in which case, the client should re-establish the stream. Flow control can be achieved by configuring the underlying RPC channel.

Parameters

Name	Description
requests	Iterator[``.pubsub.StreamingPullRequest``] The request object iterator. Request for the `StreamingPull` streaming RPC method. This request is used to establish the initial stream as well as to stream acknowledgements and ack deadline modifications from the client to the server.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
Iterable[`.pubsub.StreamingPullResponse`]	Response for the ``StreamingPull`` method. This response is used to stream messages from the server to the client.

subscribe(subscription, callback, flow_control=(), scheduler=None)

Asynchronously start receiving messages on a given subscription.

This method starts a background thread to begin pulling messages from a Pub/Sub subscription and scheduling them to be processed using the provided callback.

The callback will be called with an individual xref_Message. It is the responsibility of the callback to either call ack() or nack() on the message when it finished processing. If an exception occurs in the callback during processing, the exception is logged and the message is nack() ed.

The flow_control argument can be used to control the rate of at which messages are pulled. The settings are relatively conservative by default to prevent "message hoarding" - a situation where the client pulls a large number of messages but can not process them fast enough leading it to "starve" other clients of messages. Increasing these settings may lead to faster throughput for messages that do not take a long time to process.

This method starts the receiver in the background and returns a Future representing its execution. Waiting on the future (calling result()) will block forever or until a non-recoverable error is encountered (such as loss of network connectivity). Cancelling the future will signal the process to shutdown gracefully and exit.

Example:

from google.cloud import pubsub_v1

subscriber_client = pubsub_v1.SubscriberClient()

# existing subscription
subscription = subscriber_client.subscription_path(
    'my-project-id', 'my-subscription')

def callback(message):
    print(message)
    message.ack()

future = subscriber_client.subscribe(
    subscription, callback)

try:
    future.result()
except KeyboardInterrupt:
    future.cancel()

Parameters

Name	Description
subscription	`str` The name of the subscription. The subscription should have already been created (for example, by using `create_subscription`).
callback	`Callable[Message]` The callback function. This function receives the message as its only argument and will be called from a different thread/ process depending on the scheduling strategy.
flow_control	`FlowControl` The flow control settings. Use this to prevent situations where you are inundated with too many messages at once.
scheduler	`Scheduler` An optional scheduler to use when executing the callback. This controls how callbacks are executed concurrently. This object must not be shared across multiple SubscriberClients.

subscription_path

subscription_path(project: str, subscription: str)

Return a fully-qualified subscription string.

test_iam_permissions

test_iam_permissions(request: google.iam.v1.iam_policy_pb2.TestIamPermissionsRequest = None, *, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Tests the specified permissions against the IAM access control policy for a function. If the function does not exist, this will return an empty set of permissions, not a NOT_FOUND error.

Parameters

Name	Description
request	`.iam_policy.TestIamPermissionsRequest` The request object. Request message for `TestIamPermissions` method.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.iam_policy.TestIamPermissionsResponse`	Response message for ``TestIamPermissions`` method.

update_snapshot

update_snapshot(request: google.cloud.pubsub_v1.types.UpdateSnapshotRequest = None, *, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Updates an existing snapshot. Snapshots are used in Seek operations, which allow you to manage message acknowledgments in bulk. That is, you can set the acknowledgment state of messages in an existing subscription to the state captured by a snapshot.

Parameters

Name	Description
request	`.pubsub.UpdateSnapshotRequest` The request object. Request for the UpdateSnapshot method.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.Snapshot`	A snapshot resource. Snapshots are used in `Seek

update_subscription

update_subscription(request: google.cloud.pubsub_v1.types.UpdateSubscriptionRequest = None, *, retry: google.api_core.retry.Retry = <object object>, timeout: float = None, metadata: Sequence[Tuple[str, str]] = ())

Updates an existing subscription. Note that certain properties of a subscription, such as its topic, are not modifiable.

Parameters

Name	Description
request	`.pubsub.UpdateSubscriptionRequest` The request object. Request for the UpdateSubscription method.
retry	`google.api_core.retry.Retry` Designation of what errors, if any, should be retried.
timeout	`float` The timeout for this request.
metadata	`Sequence[Tuple[str, str]]` Strings which should be sent along with the request as metadata.

Returns

Type	Description
`.pubsub.Subscription`	A subscription resource.