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    REST Resource: projects.subscriptions

    Resource: Subscription

    A subscription resource. If none of pushConfig , bigqueryConfig , or cloudStorageConfig is set, then the subscriber will pull and ack messages using API methods. At most one of these fields may be set.

    JSON representation 
     { 
 "name" 
 : 
 string 
 , 
 "topic" 
 : 
 string 
 , 
 "pushConfig" 
 : 
 { 
 object (  PushConfig 
 
) 
 } 
 , 
 "bigqueryConfig" 
 : 
 { 
 object (  BigQueryConfig 
 
) 
 } 
 , 
 "cloudStorageConfig" 
 : 
 { 
 object (  CloudStorageConfig 
 
) 
 } 
 , 
 "ackDeadlineSeconds" 
 : 
 integer 
 , 
 "retainAckedMessages" 
 : 
 boolean 
 , 
 "messageRetentionDuration" 
 : 
 string 
 , 
 "labels" 
 : 
 { 
 string 
 : 
 string 
 , 
 ... 
 } 
 , 
 "enableMessageOrdering" 
 : 
 boolean 
 , 
 "expirationPolicy" 
 : 
 { 
 object (  ExpirationPolicy 
 
) 
 } 
 , 
 "filter" 
 : 
 string 
 , 
 "deadLetterPolicy" 
 : 
 { 
 object (  DeadLetterPolicy 
 
) 
 } 
 , 
 "retryPolicy" 
 : 
 { 
 object (  RetryPolicy 
 
) 
 } 
 , 
 "detached" 
 : 
 boolean 
 , 
 "enableExactlyOnceDelivery" 
 : 
 boolean 
 , 
 "topicMessageRetentionDuration" 
 : 
 string 
 , 
 "state" 
 : 
 enum (  State 
 
) 
 , 
 "analyticsHubSubscriptionInfo" 
 : 
 { 
 object (  AnalyticsHubSubscriptionInfo 
 
) 
 } 
 , 
 "messageTransforms" 
 : 
 [ 
 { 
 object (  MessageTransform 
 
) 
 } 
 ] 
 }
    Fields
    name

    string

    Required. Name of the subscription. Format is projects/{project}/subscriptions/{sub} .

    topic

    string

    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.

    pushConfig

    object ( PushConfig )

    Optional. If push delivery is used with this subscription, this field is used to configure it.

    bigqueryConfig

    object ( BigQueryConfig )

    Optional. If delivery to BigQuery is used with this subscription, this field is used to configure it.

    cloudStorageConfig

    object ( CloudStorageConfig )

    Optional. If delivery to Google Cloud Storage is used with this subscription, this field is used to configure it.

    ackDeadlineSeconds

    integer

    Optional. 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 subscriptions.modifyAckDeadline with the corresponding ackId if using non-streaming pull or send the ackId 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.

    retainAckedMessages

    boolean

    Optional. Indicates whether to retain acknowledged messages. If true, then messages are not expunged from the subscription's backlog, even if they are acknowledged, until they fall out of the messageRetentionDuration window. This must be true if you would like to subscriptions.seek to a timestamp in the past to replay previously-acknowledged messages.

    messageRetentionDuration

    string ( Duration format)

    Optional. How long to retain unacknowledged messages in the subscription's backlog, from the moment a message is published. If retainAckedMessages is true, then this also configures the retention of acknowledged messages, and thus configures how far back in time a subscriptions.seek can be done. Defaults to 7 days. Cannot be more than 31 days or less than 10 minutes.

    A duration in seconds with up to nine fractional digits, ending with ' s '. Example: "3.5s" .

    labels

    map (key: string, value: string)

    Optional. See Creating and managing labels .

    An object containing a list of "key": value pairs. Example: { "name": "wrench", "mass": "1.3kg", "count": "3" } .

    enableMessageOrdering

    boolean

    Optional. If true, messages published with the same orderingKey in PubsubMessage will be delivered to the subscribers in the order in which they are received by the Pub/Sub system. Otherwise, they may be delivered in any order.

    expirationPolicy

    object ( ExpirationPolicy )

    Optional. A policy that specifies the conditions for this subscription's expiration. A subscription is considered active as long as any connected subscriber is successfully consuming messages from the subscription or is issuing operations on the subscription. If expirationPolicy is not set, a default policy with ttl of 31 days will be used. The minimum allowed value for expirationPolicy.ttl is 1 day. If expirationPolicy is set, but expirationPolicy.ttl is not set, the subscription never expires.

    filter

    string

    Optional. An expression written in the Pub/Sub filter language . If non-empty, then only PubsubMessage s whose attributes field matches the filter are delivered on this subscription. If empty, then no messages are filtered out.

    deadLetterPolicy

    object ( DeadLetterPolicy )

    Optional. A policy that specifies the conditions for dead lettering messages in this subscription. If deadLetterPolicy is not set, dead lettering is disabled.

    The Pub/Sub service account associated with this subscriptions's parent project (i.e., service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have permission to subscriptions.acknowledge() messages on this subscription.

    retryPolicy

    object ( RetryPolicy )

    Optional. A policy that specifies how Pub/Sub retries message delivery for this subscription.

    If not set, the default retry policy is applied. This generally implies that messages will be retried as soon as possible for healthy subscribers. RetryPolicy will be triggered on NACKs or acknowledgment deadline exceeded events for a given message.

    detached

    boolean

    Optional. Indicates whether the subscription is detached from its topic. Detached subscriptions don't receive messages from their topic and don't retain any backlog. subscriptions.pull and StreamingPull requests will return FAILED_PRECONDITION. If the subscription is a push subscription, pushes to the endpoint will not be made.

    enableExactlyOnceDelivery

    boolean

    Optional. If true, Pub/Sub provides the following guarantees for the delivery of a message with a given value of messageId on this subscription:

    • The message sent to a subscriber is guaranteed not to be resent before the message's acknowledgment deadline expires.
    • An acknowledged message will not be resent to a subscriber.

    Note that subscribers may still receive multiple copies of a message when enableExactlyOnceDelivery is true if the message was published multiple times by a publisher client. These copies are considered distinct by Pub/Sub and have distinct messageId values.

    topicMessageRetentionDuration

    string ( Duration format)

    Output only. Indicates the minimum duration for which a message is retained after it is published to the subscription's topic. If this field is set, messages published to the subscription's topic in the last topicMessageRetentionDuration are always available to subscribers. See the messageRetentionDuration field in Topic . This field is set only in responses from the server; it is ignored if it is set in any requests.

    A duration in seconds with up to nine fractional digits, ending with ' s '. Example: "3.5s" .

    state

    enum ( State )

    Output only. An output-only field indicating whether or not the subscription can receive messages.

    analyticsHubSubscriptionInfo

    object ( AnalyticsHubSubscriptionInfo )

    Output only. Information about the associated Analytics Hub subscription. Only set if the subscritpion is created by Analytics Hub.

    messageTransforms[]

    object ( MessageTransform )

    Optional. Transforms to be applied to messages before they are delivered to subscribers. Transforms are applied in the order specified.

    PushConfig

    Configuration for a push delivery endpoint.

    JSON representation 
     { 
 "pushEndpoint" 
 : 
 string 
 , 
 "attributes" 
 : 
 { 
 string 
 : 
 string 
 , 
 ... 
 } 
 , 
 // Union field authentication_method 
can be only one of the following: 
 "oidcToken" 
 : 
 { 
 object (  OidcToken 
 
) 
 } 
 // End of list of possible types for union field authentication_method 
. 
 // Union field wrapper 
can be only one of the following: 
 "pubsubWrapper" 
 : 
 { 
 object (  PubsubWrapper 
 
) 
 } 
 , 
 "noWrapper" 
 : 
 { 
 object (  NoWrapper 
 
) 
 } 
 // End of list of possible types for union field wrapper 
. 
 }
    Fields
    pushEndpoint

    string

    Optional. A URL locating the endpoint to which messages should be pushed. For example, a Webhook endpoint might use https://example.com/push .

    attributes

    map (key: string, value: string)

    Optional. Endpoint configuration attributes that can be used to control different aspects of the message delivery.

    The only currently supported attribute is x-goog-version , which you can use to change the format of the pushed message. This attribute indicates the version of the data expected by the endpoint. This controls the shape of the pushed message (i.e., its fields and metadata).

    If not present during the subscriptions.create call, it will default to the version of the Pub/Sub API used to make such call. If not present in a subscriptions.modifyPushConfig call, its value will not be changed. subscriptions.get calls will always return a valid version, even if the subscription was created without this attribute.

    The only supported values for the x-goog-version attribute are:

    • v1beta1 : uses the push format defined in the v1beta1 Pub/Sub API.
    • v1 or v1beta2 : uses the push format defined in the v1 Pub/Sub API.

    For example: attributes { "x-goog-version": "v1" }

    An object containing a list of "key": value pairs. Example: { "name": "wrench", "mass": "1.3kg", "count": "3" } .

    Union field authentication_method . An authentication method used by push endpoints to verify the source of push requests. This can be used with push endpoints that are private by default to allow requests only from the Pub/Sub system, for example. This field is optional and should be set only by users interested in authenticated push. authentication_method can be only one of the following:
    oidcToken

    object ( OidcToken )

    Optional. If specified, Pub/Sub will generate and attach an OIDC JWT token as an Authorization header in the HTTP request for every pushed message.

    Union field wrapper . The format of the delivered message to the push endpoint is defined by the chosen wrapper. When unset, PubsubWrapper is used. wrapper can be only one of the following:
    pubsubWrapper

    object ( PubsubWrapper )

    Optional. When set, the payload to the push endpoint is in the form of the JSON representation of a PubsubMessage ( https://cloud.google.com/pubsub/docs/reference/rpc/google.pubsub.v1#pubsubmessage) .

    noWrapper

    object ( NoWrapper )

    Optional. When set, the payload to the push endpoint is not wrapped.

    OidcToken

    Contains information needed for generating an OpenID Connect token .

    JSON representation 
     { 
 "serviceAccountEmail" 
 : 
 string 
 , 
 "audience" 
 : 
 string 
 }
    Fields
    audience

    string

    Optional. Audience to be used when generating OIDC token. The audience claim identifies the recipients that the JWT is intended for. The audience value is a single case-sensitive string. Having multiple values (array) for the audience field is not supported. More info about the OIDC JWT token audience here: https://tools.ietf.org/html/rfc7519#section-4.1.3 Note: if not specified, the Push endpoint URL will be used.

    PubsubWrapper

    This type has no fields.

    The payload to the push endpoint is in the form of the JSON representation of a PubsubMessage ( https://cloud.google.com/pubsub/docs/reference/rpc/google.pubsub.v1#pubsubmessage) .

    NoWrapper

    Sets the data field as the HTTP body for delivery.

    JSON representation 
     { 
 "writeMetadata" 
 : 
 boolean 
 }
    Fields
    writeMetadata

    boolean

    Optional. When true, writes the Pub/Sub message metadata to x-goog-pubsub-<KEY>:<VAL> headers of the HTTP request. Writes the Pub/Sub message attributes to <KEY>:<VAL> headers of the HTTP request.

    BigQueryConfig

    Configuration for a BigQuery subscription.

    JSON representation 
     { 
 "table" 
 : 
 string 
 , 
 "useTopicSchema" 
 : 
 boolean 
 , 
 "writeMetadata" 
 : 
 boolean 
 , 
 "dropUnknownFields" 
 : 
 boolean 
 , 
 "state" 
 : 
 enum (  State 
 
) 
 , 
 "useTableSchema" 
 : 
 boolean 
 , 
 "serviceAccountEmail" 
 : 
 string 
 }
    Fields
    table

    string

    Optional. The name of the table to which to write data, of the form {projectId}.{datasetId}.{tableId}
    useTopicSchema

    boolean

    Optional. When true, use the topic's schema as the columns to write to in BigQuery, if it exists. useTopicSchema and useTableSchema cannot be enabled at the same time.
    writeMetadata

    boolean

    Optional. When true, write the subscription name, messageId, publishTime, attributes, and orderingKey to additional columns in the table. The subscription name, messageId, and publishTime fields are put in their own columns while all other message properties (other than data) are written to a JSON object in the attributes column.
    dropUnknownFields

    boolean

    Optional. When true and useTopicSchema is true, any fields that are a part of the topic schema that are not part of the BigQuery table schema are dropped when writing to BigQuery. Otherwise, the schemas must be kept in sync and any messages with extra fields are not written and remain in the subscription's backlog.
    state

    enum ( State )

    Output only. An output-only field that indicates whether or not the subscription can receive messages.
    useTableSchema

    boolean

    Optional. When true, use the BigQuery table's schema as the columns to write to in BigQuery. useTableSchema and useTopicSchema cannot be enabled at the same time.

    State

    Possible states for a BigQuery subscription.

    Enums
    STATE_UNSPECIFIED Default value. This value is unused.
    ACTIVE The subscription can actively send messages to BigQuery
    PERMISSION_DENIED Cannot write to the BigQuery table because of permission denied errors. This can happen if - Pub/Sub SA has not been granted the appropriate BigQuery IAM permissions - bigquery.googleapis.com API is not enabled for the project ( instructions )
    NOT_FOUND Cannot write to the BigQuery table because it does not exist.
    SCHEMA_MISMATCH Cannot write to the BigQuery table due to a schema mismatch.
    IN_TRANSIT_LOCATION_RESTRICTION Cannot write to the destination because enforceInTransit is set to true and the destination locations are not in the allowed regions.

    CloudStorageConfig

    Configuration for a Cloud Storage subscription.

    JSON representation 
     { 
 "bucket" 
 : 
 string 
 , 
 "filenamePrefix" 
 : 
 string 
 , 
 "filenameSuffix" 
 : 
 string 
 , 
 "filenameDatetimeFormat" 
 : 
 string 
 , 
 "maxDuration" 
 : 
 string 
 , 
 "maxBytes" 
 : 
 string 
 , 
 "maxMessages" 
 : 
 string 
 , 
 "state" 
 : 
 enum (  State 
 
) 
 , 
 "serviceAccountEmail" 
 : 
 string 
 , 
 // Union field output_format 
can be only one of the following: 
 "textConfig" 
 : 
 { 
 object (  TextConfig 
 
) 
 } 
 , 
 "avroConfig" 
 : 
 { 
 object (  AvroConfig 
 
) 
 } 
 // End of list of possible types for union field output_format 
. 
 }
    Fields
    bucket

    string

    Required. User-provided name for the Cloud Storage bucket. The bucket must be created by the user. The bucket name must be without any prefix like "gs://". See the bucket naming requirements .

    filenamePrefix

    string

    Optional. User-provided prefix for Cloud Storage filename. See the object naming requirements .

    filenameSuffix

    string

    Optional. User-provided suffix for Cloud Storage filename. See the object naming requirements . Must not end in "/".

    filenameDatetimeFormat

    string

    Optional. User-provided format string specifying how to represent datetimes in Cloud Storage filenames. See the datetime format guidance .

    maxDuration

    string ( Duration format)

    Optional. The maximum duration that can elapse before a new Cloud Storage file is created. Min 1 minute, max 10 minutes, default 5 minutes. May not exceed the subscription's acknowledgment deadline.

    A duration in seconds with up to nine fractional digits, ending with ' s '. Example: "3.5s" .

    maxBytes

    string ( int64 format)

    Optional. The maximum bytes that can be written to a Cloud Storage file before a new file is created. Min 1 KB, max 10 GiB. The maxBytes limit may be exceeded in cases where messages are larger than the limit.

    maxMessages

    string ( int64 format)

    Optional. The maximum number of messages that can be written to a Cloud Storage file before a new file is created. Min 1000 messages.

    state

    enum ( State )

    Output only. An output-only field that indicates whether or not the subscription can receive messages.

    Union field output_format . Defaults to text format. output_format can be only one of the following:
    textConfig

    object ( TextConfig )

    Optional. If set, message data will be written to Cloud Storage in text format.

    avroConfig

    object ( AvroConfig )

    Optional. If set, message data will be written to Cloud Storage in Avro format.

    TextConfig

    This type has no fields.

    Configuration for writing message data in text format. Message payloads will be written to files as raw text, separated by a newline.

    AvroConfig

    Configuration for writing message data in Avro format. Message payloads and metadata will be written to files as an Avro binary.

    JSON representation 
     { 
 "writeMetadata" 
 : 
 boolean 
 , 
 "useTopicSchema" 
 : 
 boolean 
 }
    Fields
    writeMetadata

    boolean

    Optional. When true, write the subscription name, messageId, publishTime, attributes, and orderingKey as additional fields in the output. The subscription name, messageId, and publishTime fields are put in their own fields while all other message properties other than data (for example, an orderingKey, if present) are added as entries in the attributes map.
    useTopicSchema

    boolean

    Optional. When true, the output Cloud Storage file will be serialized using the topic schema, if it exists.

    State

    Possible states for a Cloud Storage subscription.

    Enums
    STATE_UNSPECIFIED Default value. This value is unused.
    ACTIVE The subscription can actively send messages to Cloud Storage.
    PERMISSION_DENIED Cannot write to the Cloud Storage bucket because of permission denied errors.
    NOT_FOUND Cannot write to the Cloud Storage bucket because it does not exist.
    IN_TRANSIT_LOCATION_RESTRICTION Cannot write to the destination because enforceInTransit is set to true and the destination locations are not in the allowed regions.
    SCHEMA_MISMATCH Cannot write to the Cloud Storage bucket due to an incompatibility between the topic schema and subscription settings.

    ExpirationPolicy

    A policy that specifies the conditions for resource expiration (i.e., automatic resource deletion).

    JSON representation 
     { 
 "ttl" 
 : 
 string 
 }
    Fields
    ttl

    string ( Duration format)

    Optional. Specifies the "time-to-live" duration for an associated resource. The resource expires if it is not active for a period of ttl . The definition of "activity" depends on the type of the associated resource. The minimum and maximum allowed values for ttl depend on the type of the associated resource, as well. If ttl is not set, the associated resource never expires.

    A duration in seconds with up to nine fractional digits, ending with ' s '. Example: "3.5s" .

    DeadLetterPolicy

    Dead lettering is done on a best effort basis. The same message might be dead lettered multiple times.

    If validation on any of the fields fails at subscription creation/updation, the create/update subscription request will fail.

    JSON representation 
     { 
 "deadLetterTopic" 
 : 
 string 
 , 
 "maxDeliveryAttempts" 
 : 
 integer 
 }
    Fields
    deadLetterTopic

    string

    Optional. The name of the topic to which dead letter messages should be published. Format is projects/{project}/topics/{topic} .The Pub/Sub service account associated with the enclosing subscription's parent project (i.e., service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have permission to topics.publish() to this topic.

    The operation will fail if the topic does not exist. Users should ensure that there is a subscription attached to this topic since messages published to a topic with no subscriptions are lost.
    maxDeliveryAttempts

    integer

    Optional. The maximum number of delivery attempts for any message. The value must be between 5 and 100.

    The number of delivery attempts is defined as 1 + (the sum of number of NACKs and number of times the acknowledgment deadline has been exceeded for the message).

    A NACK is any call to subscriptions.modifyAckDeadline with a 0 deadline. Note that client libraries may automatically extend ack_deadlines.

    This field will be honored on a best effort basis.

    If this parameter is 0, a default value of 5 is used.

    RetryPolicy

    A policy that specifies how Pub/Sub retries message delivery.

    Retry delay will be exponential based on provided minimum and maximum backoffs. https://en.wikipedia.org/wiki/Exponential_backoff .

    RetryPolicy will be triggered on NACKs or acknowledgment deadline exceeded events for a given message.

    Retry Policy is implemented on a best effort basis. At times, the delay between consecutive deliveries may not match the configuration. That is, delay can be more or less than configured backoff.

    JSON representation 
     { 
 "minimumBackoff" 
 : 
 string 
 , 
 "maximumBackoff" 
 : 
 string 
 }
    Fields
    minimumBackoff

    string ( Duration format)

    Optional. The minimum delay between consecutive deliveries of a given message. Value should be between 0 and 600 seconds. Defaults to 10 seconds.

    A duration in seconds with up to nine fractional digits, ending with ' s '. Example: "3.5s" .
    maximumBackoff

    string ( Duration format)

    Optional. The maximum delay between consecutive deliveries of a given message. Value should be between 0 and 600 seconds. Defaults to 600 seconds.

    A duration in seconds with up to nine fractional digits, ending with ' s '. Example: "3.5s" .

    State

    Possible states for a subscription.

    Enums
    STATE_UNSPECIFIED Default value. This value is unused.
    ACTIVE The subscription can actively receive messages
    RESOURCE_ERROR The subscription cannot receive messages because of an error with the resource to which it pushes messages. See the more detailed error state in the corresponding configuration.

    AnalyticsHubSubscriptionInfo

    Information about an associated Analytics Hub subscription .

    JSON representation 
     { 
 "listing" 
 : 
 string 
 , 
 "subscription" 
 : 
 string 
 }
    Fields
    listing

    string

    Optional. The name of the associated Analytics Hub listing resource. Pattern: "projects/{project}/locations/{location}/dataExchanges/{data_exchange}/listings/{listing}"
    subscription

    string

    Optional. The name of the associated Analytics Hub subscription resource. Pattern: "projects/{project}/locations/{location}/subscriptions/{subscription}"

    Methods

    acknowledge

    		Acknowledges the messages associated with the ack_ids in the AcknowledgeRequest .

    create

    		Creates a subscription to a given topic.

    delete

    		Deletes an existing subscription.

    detach

    		Detaches a subscription from this topic.

    get

    		Gets the configuration details of a subscription.

    getIamPolicy

    		Gets the access control policy for a resource.

    list

    		Lists matching subscriptions.

    modifyAckDeadline

    		Modifies the ack deadline for a specific message.

    modifyPushConfig

    		Modifies the PushConfig for a specified subscription.

    patch

    		Updates an existing subscription by updating the fields specified in the update mask.

    pull

    		Pulls messages from the server.

    seek

    		Seeks an existing subscription to a point in time or to a given snapshot, whichever is provided in the request.

    setIamPolicy

    		Sets the access control policy on the specified resource.

    testIamPermissions

    		Returns permissions that a caller has on the specified resource.
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