docs-archive/apache-airflow-providers-google/1.0.0/_sources/_api/airflow/providers/google/cloud/hooks/cloud_memorystore/index.rst.txt

:mod:`airflow.providers.google.cloud.hooks.cloud_memorystore`
=============================================================

.. py:module:: airflow.providers.google.cloud.hooks.cloud_memorystore

.. autoapi-nested-parse::

   Hooks for Cloud Memorystore service



Module Contents
---------------

.. py:class:: CloudMemorystoreHook(gcp_conn_id: str = 'google_cloud_default', delegate_to: Optional[str] = None, impersonation_chain: Optional[Union[str, Sequence[str]]] = None)

   Bases: :class:`airflow.providers.google.common.hooks.base_google.GoogleBaseHook`

   Hook for Google Cloud Memorystore APIs.

   All the methods in the hook where project_id is used must be called with
   keyword arguments rather than positional.

   :param gcp_conn_id: The connection ID to use when fetching connection info.
   :type gcp_conn_id: str
   :param delegate_to: The account to impersonate using domain-wide delegation of authority,
       if any. For this to work, the service account making the request must have
       domain-wide delegation enabled.
   :type delegate_to: str
   :param impersonation_chain: Optional service account to impersonate using short-term
       credentials, or chained list of accounts required to get the access_token
       of the last account in the list, which will be impersonated in the request.
       If set as a string, the account must grant the originating account
       the Service Account Token Creator IAM role.
       If set as a sequence, the identities from the list must grant
       Service Account Token Creator IAM role to the directly preceding identity, with first
       account from the list granting this role to the originating account.
   :type impersonation_chain: Union[str, Sequence[str]]

   
   .. method:: get_conn(self)

      Retrieves client library object that allow access to Cloud Memorystore service.



   
   .. staticmethod:: _append_label(instance: Instance, key: str, val: str)

      Append labels to provided Instance type

      Labels must fit the regex ``[a-z]([-a-z0-9]*[a-z0-9])?`` (current
       airflow version string follows semantic versioning spec: x.y.z).

      :param instance: The proto to append resource_label airflow
          version to
      :type instance: google.cloud.container_v1.types.Cluster
      :param key: The key label
      :type key: str
      :param val:
      :type val: str
      :return: The cluster proto updated with new label



   
   .. method:: create_instance(self, location: str, instance_id: str, instance: Union[Dict, Instance], project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Creates a Redis instance based on the specified tier and memory size.

      By default, the instance is accessible from the project's `default network
      <https://cloud.google.com/compute/docs/networks-and-firewalls#networks>`__.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance_id: Required. The logical name of the Redis instance in the customer project with the
          following restrictions:

          -  Must contain only lowercase letters, numbers, and hyphens.
          -  Must start with a letter.
          -  Must be between 1-40 characters.
          -  Must end with a number or a letter.
          -  Must be unique within the customer project / location
      :type instance_id: str
      :param instance: Required. A Redis [Instance] resource

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.redis_v1.types.Instance`
      :type instance: Union[Dict, google.cloud.redis_v1.types.Instance]
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: delete_instance(self, location: str, instance: str, project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Deletes a specific Redis instance.  Instance stops serving and data is deleted.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance: The logical name of the Redis instance in the customer project.
      :type instance: str
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: export_instance(self, location: str, instance: str, output_config: Union[Dict, OutputConfig], project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Export Redis instance data into a Redis RDB format file in Cloud Storage.

      Redis will continue serving during this operation.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance: The logical name of the Redis instance in the customer project.
      :type instance: str
      :param output_config: Required. Specify data to be exported.

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.redis_v1.types.OutputConfig`
      :type output_config: Union[Dict, google.cloud.redis_v1.types.OutputConfig]
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: failover_instance(self, location: str, instance: str, data_protection_mode: FailoverInstanceRequest.DataProtectionMode, project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Initiates a failover of the master node to current replica node for a specific STANDARD tier Cloud
      Memorystore for Redis instance.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance: The logical name of the Redis instance in the customer project.
      :type instance: str
      :param data_protection_mode: Optional. Available data protection modes that the user can choose. If
          it's unspecified, data protection mode will be LIMITED_DATA_LOSS by default.
      :type data_protection_mode: google.cloud.redis_v1.gapic.enums.FailoverInstanceRequest
          .DataProtectionMode
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: get_instance(self, location: str, instance: str, project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Gets the details of a specific Redis instance.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance: The logical name of the Redis instance in the customer project.
      :type instance: str
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: import_instance(self, location: str, instance: str, input_config: Union[Dict, InputConfig], project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Import a Redis RDB snapshot file from Cloud Storage into a Redis instance.

      Redis may stop serving during this operation. Instance state will be IMPORTING for entire operation.
      When complete, the instance will contain only data from the imported file.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance: The logical name of the Redis instance in the customer project.
      :type instance: str
      :param input_config: Required. Specify data to be imported.

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.redis_v1.types.InputConfig`
      :type input_config: Union[Dict, google.cloud.redis_v1.types.InputConfig]
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: list_instances(self, location: str, page_size: int, project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Lists all Redis instances owned by a project in either the specified location (region) or all
      locations.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)

              If it is specified as ``-`` (wildcard), then all regions available to the project are
              queried, and the results are aggregated.
      :type location: str
      :param page_size: 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.
      :type page_size: int
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: update_instance(self, update_mask: Union[Dict, FieldMask], instance: Union[Dict, Instance], project_id: str, location: Optional[str] = None, instance_id: Optional[str] = None, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Updates the metadata and configuration of a specific Redis instance.

      :param update_mask: Required. Mask of fields to update. At least one path must be supplied in this
          field. The elements of the repeated paths field may only include these fields from ``Instance``:

          -  ``displayName``
          -  ``labels``
          -  ``memorySizeGb``
          -  ``redisConfig``

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.redis_v1.types.FieldMask`
      :type update_mask: Union[Dict, google.cloud.redis_v1.types.FieldMask]
      :param instance: Required. Update description. Only fields specified in ``update_mask`` are updated.

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.redis_v1.types.Instance`
      :type instance: Union[Dict, google.cloud.redis_v1.types.Instance]
      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance_id: The logical name of the Redis instance in the customer project.
      :type instance_id: str
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]




.. py:class:: CloudMemorystoreMemcachedHook(gcp_conn_id: str = 'google_cloud_default', delegate_to: Optional[str] = None, impersonation_chain: Optional[Union[str, Sequence[str]]] = None)

   Bases: :class:`airflow.providers.google.common.hooks.base_google.GoogleBaseHook`

   Hook for Google Cloud Memorystore for Memcached service APIs.

   All the methods in the hook where project_id is used must be called with
   keyword arguments rather than positional.

   :param gcp_conn_id: The connection ID to use when fetching connection info.
   :type gcp_conn_id: str
   :param delegate_to: The account to impersonate using domain-wide delegation of authority,
       if any. For this to work, the service account making the request must have
       domain-wide delegation enabled.
   :type delegate_to: str
   :param impersonation_chain: Optional service account to impersonate using short-term
       credentials, or chained list of accounts required to get the access_token
       of the last account in the list, which will be impersonated in the request.
       If set as a string, the account must grant the originating account
       the Service Account Token Creator IAM role.
       If set as a sequence, the identities from the list must grant
       Service Account Token Creator IAM role to the directly preceding identity, with first
       account from the list granting this role to the originating account.
   :type impersonation_chain: Union[str, Sequence[str]]

   
   .. method:: get_conn(self)

      Retrieves client library object that allow access to Cloud Memorystore Memcached service.



   
   .. staticmethod:: _append_label(instance: cloud_memcache.Instance, key: str, val: str)

      Append labels to provided Instance type

      Labels must fit the regex ``[a-z]([-a-z0-9]*[a-z0-9])?`` (current
       airflow version string follows semantic versioning spec: x.y.z).

      :param instance: The proto to append resource_label airflow
          version to
      :type instance: google.cloud.memcache_v1beta2.types.cloud_memcache.Instance
      :param key: The key label
      :type key: str
      :param val:
      :type val: str
      :return: The cluster proto updated with new label



   
   .. method:: apply_parameters(self, node_ids: Sequence[str], apply_all: bool, project_id: str, location: str, instance_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Will update current set of Parameters to the set of specified nodes of the Memcached Instance.

      :param node_ids: Nodes to which we should apply the instance-level parameter group.
      :type node_ids: Sequence[str]
      :param apply_all: Whether to apply instance-level parameter group to all nodes. If set to true,
          will explicitly restrict users from specifying any nodes, and apply parameter group updates
          to all nodes within the instance.
      :type apply_all: bool
      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance_id: The logical name of the Memcached instance in the customer project.
      :type instance_id: str
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: create_instance(self, location: str, instance_id: str, instance: Union[Dict, cloud_memcache.Instance], project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Creates a Memcached instance based on the specified tier and memory size.

      By default, the instance is accessible from the project's `default network
      <https://cloud.google.com/compute/docs/networks-and-firewalls#networks>`__.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance_id: Required. The logical name of the Memcached instance in the customer project
          with the following restrictions:

          -  Must contain only lowercase letters, numbers, and hyphens.
          -  Must start with a letter.
          -  Must be between 1-40 characters.
          -  Must end with a number or a letter.
          -  Must be unique within the customer project / location
      :type instance_id: str
      :param instance: Required. A Memcached [Instance] resource

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.memcache_v1beta2.types.cloud_memcache.Instance`
      :type instance: Union[Dict, google.cloud.memcache_v1beta2.types.cloud_memcache.Instance]
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: delete_instance(self, location: str, instance: str, project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Deletes a specific Memcached instance.  Instance stops serving and data is deleted.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance: The logical name of the Memcached instance in the customer project.
      :type instance: str
      :param project_id:  Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: get_instance(self, location: str, instance: str, project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Gets the details of a specific Memcached instance.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance: The logical name of the Memcached instance in the customer project.
      :type instance: str
      :param project_id:  Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: list_instances(self, location: str, project_id: str, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Lists all Memcached instances owned by a project in either the specified location (region) or all
      locations.

      :param location: The location of the Cloud Memorystore instance (for example europe-west1)

              If it is specified as ``-`` (wildcard), then all regions available to the project are
              queried, and the results are aggregated.
      :type location: str
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: update_instance(self, update_mask: Union[Dict, cloud_memcache.field_mask.FieldMask], instance: Union[Dict, cloud_memcache.Instance], project_id: str, location: Optional[str] = None, instance_id: Optional[str] = None, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Updates the metadata and configuration of a specific Memcached instance.

      :param update_mask: Required. Mask of fields to update. At least one path must be supplied in this
          field. The elements of the repeated paths field may only include these fields from ``Instance``:

          -  ``displayName``

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.memcache_v1beta2.types.cloud_memcache.field_mask.FieldMask`
      :type update_mask:
          Union[Dict, google.cloud.memcache_v1beta2.types.cloud_memcache.field_mask.FieldMask]
      :param instance: Required. Update description. Only fields specified in ``update_mask`` are updated.

          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.memcache_v1beta2.types.cloud_memcache.Instance`
      :type instance: Union[Dict, google.cloud.memcache_v1beta2.types.cloud_memcache.Instance]
      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance_id: The logical name of the Memcached instance in the customer project.
      :type instance_id: str
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]



   
   .. method:: update_parameters(self, update_mask: Union[Dict, cloud_memcache.field_mask.FieldMask], parameters: Union[Dict, cloud_memcache.MemcacheParameters], project_id: str, location: str, instance_id: Optional[str] = None, retry: Optional[Retry] = None, timeout: Optional[float] = None, metadata: Optional[Sequence[Tuple[str, str]]] = None)

      Updates the defined Memcached Parameters for an existing Instance. This method only stages the
          parameters, it must be followed by apply_parameters to apply the parameters to nodes of
          the Memcached Instance.

      :param update_mask: Required. Mask of fields to update.
          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.memcache_v1beta2.types.cloud_memcache.field_mask.FieldMask`
      :type update_mask:
          Union[Dict, google.cloud.memcache_v1beta2.types.cloud_memcache.field_mask.FieldMask]
      :param parameters: The parameters to apply to the instance.
          If a dict is provided, it must be of the same form as the protobuf message
          :class:`~google.cloud.memcache_v1beta2.types.cloud_memcache.MemcacheParameters`
      :type parameters: Union[Dict, google.cloud.memcache_v1beta2.types.cloud_memcache.MemcacheParameters]
      :param location: The location of the Cloud Memorystore instance (for example europe-west1)
      :type location: str
      :param instance_id: The logical name of the Memcached instance in the customer project.
      :type instance_id: str
      :param project_id: Project ID of the project that contains the instance. If set
          to None or missing, the default project_id from the Google Cloud connection is used.
      :type project_id: str
      :param retry: A retry object used to retry requests. If ``None`` is specified, requests will not be
          retried.
      :type retry: google.api_core.retry.Retry
      :param timeout: 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.
      :type timeout: float
      :param metadata: Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]