# Google Cloud Pub/Sub API . projects . topics

## Instance Methods

Returns the subscriptions Resource.

Creates the given topic with the given name.

Deletes the topic with the given name. Returns `NOT_FOUND` if the topic

Gets the configuration of a topic.

Gets the access control policy for a resource.

Lists matching topics.

Retrieves the next page of results.

Adds one or more messages to the topic. Returns `NOT_FOUND` if the topic

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

Returns permissions that a caller has on the specified resource.

### Method Details

`create(name, body, x__xgafv=None)`

    Creates the given topic with the given name.

    Args:
      name: string, 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 (`~`), plus (`+`) or percent
    signs (`%`). It must be between 3 and 255 characters in length, and it
    must not start with `"goog"`. (required)
      body: object, The request body. (required)
        The object takes the form of:

    { # A topic resource.
      "name": "A String", # 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 (`~`), plus (`+`) or percent
          # signs (`%`). It must be between 3 and 255 characters in length, and it
          # must not start with `"goog"`.
    }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A topic resource.
        "name": "A String", # 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 (`~`), plus (`+`) or percent
            # signs (`%`). It must be between 3 and 255 characters in length, and it
            # must not start with `"goog"`.
      }

`delete(topic, x__xgafv=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_`.

    Args:
      topic: string, Name of the topic to delete.
    Format is `projects/{project}/topics/{topic}`. (required)
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A generic empty message that you can re-use to avoid defining duplicated
          # empty messages in your APIs. A typical example is to use it as the request
          # or the response type of an API method. For instance:
          #
          #     service Foo {
          #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
          #     }
          #
          # The JSON representation for `Empty` is empty JSON object `{}`.
      }

`get(topic, x__xgafv=None)`

    Gets the configuration of a topic.

    Args:
      topic: string, The name of the topic to get.
    Format is `projects/{project}/topics/{topic}`. (required)
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A topic resource.
        "name": "A String", # 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 (`~`), plus (`+`) or percent
            # signs (`%`). It must be between 3 and 255 characters in length, and it
            # must not start with `"goog"`.
      }

`getIamPolicy(resource, x__xgafv=None)`

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

    Args:
      resource: string, REQUIRED: The resource for which the policy is being requested.
    See the operation documentation for the appropriate value for this field. (required)
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Defines an Identity and Access Management (IAM) policy. It is used to
          # specify access control policies for Cloud Platform resources.
          #
          #
          # A `Policy` consists of a list of `bindings`. A `Binding` binds a list of
          # `members` to a `role`, where the members can be user accounts, Google groups,
          # Google domains, and service accounts. A `role` is a named list of permissions
          # defined by IAM.
          #
          # **Example**
          #
          #     {
          #       "bindings": [
          #         {
          #           "role": "roles/owner",
          #           "members": [
          #             "user:mike@example.com",
          #             "group:admins@example.com",
          #             "domain:google.com",
          #             "serviceAccount:my-other-app@appspot.gserviceaccount.com",
          #           ]
          #         },
          #         {
          #           "role": "roles/viewer",
          #           "members": ["user:sean@example.com"]
          #         }
          #       ]
          #     }
          #
          # For a description of IAM and its features, see the
          # [IAM developer's guide](https://cloud.google.com/iam).
        "bindings": [ # Associates a list of `members` to a `role`.
            # Multiple `bindings` must not be specified for the same `role`.
            # `bindings` with no members will result in an error.
          { # Associates `members` with a `role`.
            "role": "A String", # Role that is assigned to `members`.
                # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
                # Required
            "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
                # `members` can have the following values:
                #
                # * `allUsers`: A special identifier that represents anyone who is
                #    on the internet; with or without a Google account.
                #
                # * `allAuthenticatedUsers`: A special identifier that represents anyone
                #    who is authenticated with a Google account or a service account.
                #
                # * `user:{emailid}`: An email address that represents a specific Google
                #    account. For example, `alice@gmail.com` or `joe@example.com`.
                #
                #
                # * `serviceAccount:{emailid}`: An email address that represents a service
                #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
                #
                # * `group:{emailid}`: An email address that represents a Google group.
                #    For example, `admins@example.com`.
                #
                # * `domain:{domain}`: A Google Apps domain name that represents all the
                #    users of that domain. For example, `google.com` or `example.com`.
                #
              "A String",
            ],
          },
        ],
        "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
            # prevent simultaneous updates of a policy from overwriting each other.
            # It is strongly suggested that systems make use of the `etag` in the
            # read-modify-write cycle to perform policy updates in order to avoid race
            # conditions: An `etag` is returned in the response to `getIamPolicy`, and
            # systems are expected to put that etag in the request to `setIamPolicy` to
            # ensure that their change will be applied to the same version of the policy.
            #
            # If no `etag` is provided in the call to `setIamPolicy`, then the existing
            # policy is overwritten blindly.
        "version": 42, # Version of the `Policy`. The default version is 0.
      }

`list(project, pageSize=None, pageToken=None, x__xgafv=None)`

    Lists matching topics.

    Args:
      project: string, The name of the cloud project that topics belong to.
    Format is `projects/{project}`. (required)
      pageSize: integer, Maximum number of topics to return.
      pageToken: string, The value returned by the last `ListTopicsResponse`; indicates that this is
    a continuation of a prior `ListTopics` call, and that the system should
    return the next page of data.
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Response for the `ListTopics` method.
        "nextPageToken": "A String", # If not empty, indicates that there may be more topics that match the
            # request; this value should be passed in a new `ListTopicsRequest`.
        "topics": [ # The resulting topics.
          { # A topic resource.
            "name": "A String", # 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 (`~`), plus (`+`) or percent
                # signs (`%`). It must be between 3 and 255 characters in length, and it
                # must not start with `"goog"`.
          },
        ],
      }

`list_next(previous_request, previous_response)`

    Retrieves the next page of results.

    Args:
      previous_request: The request for the previous page. (required)
      previous_response: The response from the request for the previous page. (required)

    Returns:
      A request object that you can call 'execute()' on to request the next
      page. Returns None if there are no more items in the collection.

`publish(topic, body, x__xgafv=None)`

    Adds one or more messages to the topic. Returns `NOT_FOUND` if the topic
    does not exist. The message payload must not be empty; it must contain
     either a non-empty data field, or at least one attribute.

    Args:
      topic: string, The messages in the request will be published on this topic.
    Format is `projects/{project}/topics/{topic}`. (required)
      body: object, The request body. (required)
        The object takes the form of:

    { # Request for the Publish method.
        "messages": [ # The messages to publish.
          { # A message data and its attributes. The message payload must not be empty;
              # it must contain either a non-empty data field, or at least one attribute.
            "attributes": { # Optional attributes for this message.
              "a_key": "A String",
            },
            "data": "A String", # The message payload.
            "publishTime": "A String", # The time at which the message was published, populated by the server when
                # it receives the `Publish` call. It must not be populated by the
                # publisher in a `Publish` call.
            "messageId": "A String", # ID of this message, assigned by the server when the message is published.
                # Guaranteed to be unique within the topic. This value may be read by a
                # subscriber that receives a `PubsubMessage` via a `Pull` call or a push
                # delivery. It must not be populated by the publisher in a `Publish` call.
          },
        ],
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Response for the `Publish` method.
        "messageIds": [ # The server-assigned ID of each published message, in the same order as
            # the messages in the request. IDs are guaranteed to be unique within
            # the topic.
          "A String",
        ],
      }

`setIamPolicy(resource, body, x__xgafv=None)`

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

    Args:
      resource: string, REQUIRED: The resource for which the policy is being specified.
    See the operation documentation for the appropriate value for this field. (required)
      body: object, The request body. (required)
        The object takes the form of:

    { # Request message for `SetIamPolicy` method.
        "policy": { # Defines an Identity and Access Management (IAM) policy. It is used to # 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.
            # specify access control policies for Cloud Platform resources.
            #
            #
            # A `Policy` consists of a list of `bindings`. A `Binding` binds a list of
            # `members` to a `role`, where the members can be user accounts, Google groups,
            # Google domains, and service accounts. A `role` is a named list of permissions
            # defined by IAM.
            #
            # **Example**
            #
            #     {
            #       "bindings": [
            #         {
            #           "role": "roles/owner",
            #           "members": [
            #             "user:mike@example.com",
            #             "group:admins@example.com",
            #             "domain:google.com",
            #             "serviceAccount:my-other-app@appspot.gserviceaccount.com",
            #           ]
            #         },
            #         {
            #           "role": "roles/viewer",
            #           "members": ["user:sean@example.com"]
            #         }
            #       ]
            #     }
            #
            # For a description of IAM and its features, see the
            # [IAM developer's guide](https://cloud.google.com/iam).
          "bindings": [ # Associates a list of `members` to a `role`.
              # Multiple `bindings` must not be specified for the same `role`.
              # `bindings` with no members will result in an error.
            { # Associates `members` with a `role`.
              "role": "A String", # Role that is assigned to `members`.
                  # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
                  # Required
              "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
                  # `members` can have the following values:
                  #
                  # * `allUsers`: A special identifier that represents anyone who is
                  #    on the internet; with or without a Google account.
                  #
                  # * `allAuthenticatedUsers`: A special identifier that represents anyone
                  #    who is authenticated with a Google account or a service account.
                  #
                  # * `user:{emailid}`: An email address that represents a specific Google
                  #    account. For example, `alice@gmail.com` or `joe@example.com`.
                  #
                  #
                  # * `serviceAccount:{emailid}`: An email address that represents a service
                  #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
                  #
                  # * `group:{emailid}`: An email address that represents a Google group.
                  #    For example, `admins@example.com`.
                  #
                  # * `domain:{domain}`: A Google Apps domain name that represents all the
                  #    users of that domain. For example, `google.com` or `example.com`.
                  #
                "A String",
              ],
            },
          ],
          "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
              # prevent simultaneous updates of a policy from overwriting each other.
              # It is strongly suggested that systems make use of the `etag` in the
              # read-modify-write cycle to perform policy updates in order to avoid race
              # conditions: An `etag` is returned in the response to `getIamPolicy`, and
              # systems are expected to put that etag in the request to `setIamPolicy` to
              # ensure that their change will be applied to the same version of the policy.
              #
              # If no `etag` is provided in the call to `setIamPolicy`, then the existing
              # policy is overwritten blindly.
          "version": 42, # Version of the `Policy`. The default version is 0.
        },
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Defines an Identity and Access Management (IAM) policy. It is used to
          # specify access control policies for Cloud Platform resources.
          #
          #
          # A `Policy` consists of a list of `bindings`. A `Binding` binds a list of
          # `members` to a `role`, where the members can be user accounts, Google groups,
          # Google domains, and service accounts. A `role` is a named list of permissions
          # defined by IAM.
          #
          # **Example**
          #
          #     {
          #       "bindings": [
          #         {
          #           "role": "roles/owner",
          #           "members": [
          #             "user:mike@example.com",
          #             "group:admins@example.com",
          #             "domain:google.com",
          #             "serviceAccount:my-other-app@appspot.gserviceaccount.com",
          #           ]
          #         },
          #         {
          #           "role": "roles/viewer",
          #           "members": ["user:sean@example.com"]
          #         }
          #       ]
          #     }
          #
          # For a description of IAM and its features, see the
          # [IAM developer's guide](https://cloud.google.com/iam).
        "bindings": [ # Associates a list of `members` to a `role`.
            # Multiple `bindings` must not be specified for the same `role`.
            # `bindings` with no members will result in an error.
          { # Associates `members` with a `role`.
            "role": "A String", # Role that is assigned to `members`.
                # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
                # Required
            "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
                # `members` can have the following values:
                #
                # * `allUsers`: A special identifier that represents anyone who is
                #    on the internet; with or without a Google account.
                #
                # * `allAuthenticatedUsers`: A special identifier that represents anyone
                #    who is authenticated with a Google account or a service account.
                #
                # * `user:{emailid}`: An email address that represents a specific Google
                #    account. For example, `alice@gmail.com` or `joe@example.com`.
                #
                #
                # * `serviceAccount:{emailid}`: An email address that represents a service
                #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
                #
                # * `group:{emailid}`: An email address that represents a Google group.
                #    For example, `admins@example.com`.
                #
                # * `domain:{domain}`: A Google Apps domain name that represents all the
                #    users of that domain. For example, `google.com` or `example.com`.
                #
              "A String",
            ],
          },
        ],
        "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
            # prevent simultaneous updates of a policy from overwriting each other.
            # It is strongly suggested that systems make use of the `etag` in the
            # read-modify-write cycle to perform policy updates in order to avoid race
            # conditions: An `etag` is returned in the response to `getIamPolicy`, and
            # systems are expected to put that etag in the request to `setIamPolicy` to
            # ensure that their change will be applied to the same version of the policy.
            #
            # If no `etag` is provided in the call to `setIamPolicy`, then the existing
            # policy is overwritten blindly.
        "version": 42, # Version of the `Policy`. The default version is 0.
      }

`testIamPermissions(resource, body, x__xgafv=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.

    Args:
      resource: string, REQUIRED: The resource for which the policy detail is being requested.
    See the operation documentation for the appropriate value for this field. (required)
      body: object, The request body. (required)
        The object takes the form of:

    { # Request message for `TestIamPermissions` method.
        "permissions": [ # 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).
          "A String",
        ],
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Response message for `TestIamPermissions` method.
        "permissions": [ # A subset of `TestPermissionsRequest.permissions` that the caller is
            # allowed.
          "A String",
        ],
      }