text: #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  """
  This module contains Google PubSub operators.
  """
  import warnings
  from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, Union
  
  from google.api_core.retry import Retry
  from google.cloud.pubsub_v1.types import (
      DeadLetterPolicy, Duration, ExpirationPolicy, MessageStoragePolicy, PushConfig, ReceivedMessage,
      RetryPolicy,
  )
  from google.protobuf.json_format import MessageToDict
  
  from airflow.models import BaseOperator
  from airflow.providers.google.cloud.hooks.pubsub import PubSubHook
  from airflow.utils.decorators import apply_defaults
  
  
  class PubSubCreateTopicOperator(BaseOperator):
      """Create a PubSub topic.
  
      .. seealso::
          For more information on how to use this operator, take a look at the guide:
          :ref:`howto/operator:PubSubCreateTopicOperator`
  
      By default, if the topic already exists, this operator will
      not cause the DAG to fail. ::
  
          with DAG('successful DAG') as dag:
              (
                  PubSubTopicCreateOperator(project='my-project',
                                               topic='my_new_topic')
                  >> PubSubTopicCreateOperator(project='my-project',
                                               topic='my_new_topic')
              )
  
      The operator can be configured to fail if the topic already exists. ::
  
          with DAG('failing DAG') as dag:
              (
                  PubSubTopicCreateOperator(project='my-project',
                                               topic='my_new_topic')
                  >> PubSubTopicCreateOperator(project='my-project',
                                               topic='my_new_topic',
                                               fail_if_exists=True)
              )
  
      Both ``project`` and ``topic`` are templated so you can use
      variables in them.
  
      :param project_id: Optional, the GCP project ID where the topic will be created.
          If set to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param topic: the topic to create. Do not include the
          full topic path. In other words, instead of
          ``projects/{project}/topics/{topic}``, provide only
          ``{topic}``. (templated)
      :type topic: str
      :param gcp_conn_id: The connection ID to use connecting to
          Google Cloud Platform.
      :type gcp_conn_id: str
      :param delegate_to: The account to impersonate, if any.
          For this to work, the service account making the request
          must have domain-wide delegation enabled.
      :type delegate_to: str
      :param labels: Client-assigned labels; see
          https://cloud.google.com/pubsub/docs/labels
      :type labels: Dict[str, str]
      :param message_storage_policy: Policy constraining the set
          of Google Cloud Platform regions where messages published to
          the topic may be stored. If not present, then no constraints
          are in effect.
      :type message_storage_policy:
          Union[Dict, google.cloud.pubsub_v1.types.MessageStoragePolicy]
      :param kms_key_name: The resource name of the Cloud KMS CryptoKey
          to be used to protect access to messages published on this topic.
          The expected format is
          ``projects/*/locations/*/keyRings/*/cryptoKeys/*``.
      :type kms_key_name: str
      :param retry: (Optional) 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: (Optional) 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: (Optional) Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]]
      :param project: (Deprecated) the GCP project ID where the topic will be created
      :type project: str
      """
      template_fields = ['project_id', 'topic']
      ui_color = '#0273d4'
  
      # pylint: disable=too-many-arguments
      @apply_defaults
      def __init__(
          self, *,
          topic: str,
          project_id: Optional[str] = None,
          fail_if_exists: bool = False,
          gcp_conn_id: str = 'google_cloud_default',
          delegate_to: Optional[str] = None,
          labels: Optional[Dict[str, str]] = None,
          message_storage_policy: Union[Dict, MessageStoragePolicy] = None,
          kms_key_name: Optional[str] = None,
          retry: Optional[Retry] = None,
          timeout: Optional[float] = None,
          metadata: Optional[Sequence[Tuple[str, str]]] = None,
          project: Optional[str] = None,
          **kwargs
      ) -> None:
          # To preserve backward compatibility
          # TODO: remove one day
          if project:
              warnings.warn(
                  "The project parameter has been deprecated. You should pass "
                  "the project_id parameter.", DeprecationWarning, stacklevel=2)
              project_id = project
  
          super().__init__(**kwargs)
          self.project_id = project_id
          self.topic = topic
          self.fail_if_exists = fail_if_exists
          self.gcp_conn_id = gcp_conn_id
          self.delegate_to = delegate_to
          self.labels = labels
          self.message_storage_policy = message_storage_policy
          self.kms_key_name = kms_key_name
          self.retry = retry
          self.timeout = timeout
          self.metadata = metadata
  
      def execute(self, context):
          hook = PubSubHook(gcp_conn_id=self.gcp_conn_id,
                            delegate_to=self.delegate_to)
  
          self.log.info("Creating topic %s", self.topic)
          hook.create_topic(
              project_id=self.project_id,
              topic=self.topic,
              fail_if_exists=self.fail_if_exists,
              labels=self.labels,
              message_storage_policy=self.message_storage_policy,
              kms_key_name=self.kms_key_name,
              retry=self.retry,
              timeout=self.timeout,
              metadata=self.metadata
          )
          self.log.info("Created topic %s", self.topic)
  
  
  # pylint: disable=too-many-instance-attributes
  class PubSubCreateSubscriptionOperator(BaseOperator):
      """Create a PubSub subscription.
  
      .. seealso::
          For more information on how to use this operator, take a look at the guide:
          :ref:`howto/operator:PubSubCreateSubscriptionOperator`
  
      By default, the subscription will be created in ``topic_project``. If
      ``subscription_project`` is specified and the GCP credentials allow, the
      Subscription can be created in a different project from its topic.
  
      By default, if the subscription already exists, this operator will
      not cause the DAG to fail. However, the topic must exist in the project. ::
  
          with DAG('successful DAG') as dag:
              (
                  PubSubSubscriptionCreateOperator(
                      topic_project='my-project', topic='my-topic',
                      subscription='my-subscription')
                  >> PubSubSubscriptionCreateOperator(
                      topic_project='my-project', topic='my-topic',
                      subscription='my-subscription')
              )
  
      The operator can be configured to fail if the subscription already exists.
      ::
  
          with DAG('failing DAG') as dag:
              (
                  PubSubSubscriptionCreateOperator(
                      topic_project='my-project', topic='my-topic',
                      subscription='my-subscription')
                  >> PubSubSubscriptionCreateOperator(
                      topic_project='my-project', topic='my-topic',
                      subscription='my-subscription', fail_if_exists=True)
              )
  
      Finally, subscription is not required. If not passed, the operator will
      generated a universally unique identifier for the subscription's name. ::
  
          with DAG('DAG') as dag:
              (
                  PubSubSubscriptionCreateOperator(
                      topic_project='my-project', topic='my-topic')
              )
  
      ``topic_project``, ``topic``, ``subscription``, and
      ``subscription`` are templated so you can use variables in them.
  
      :param project_id: Optional, the GCP project ID where the topic exists.
          If set to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param topic: the topic to create. Do not include the
          full topic path. In other words, instead of
          ``projects/{project}/topics/{topic}``, provide only
          ``{topic}``. (templated)
      :type topic: str
      :param subscription: the Pub/Sub subscription name. If empty, a random
          name will be generated using the uuid module
      :type subscription: str
      :param subscription_project_id: the GCP project ID where the subscription
          will be created. If empty, ``topic_project`` will be used.
      :type subscription_project_id: str
      :param ack_deadline_secs: Number of seconds that a subscriber has to
          acknowledge each message pulled from the subscription
      :type ack_deadline_secs: int
      :param gcp_conn_id: The connection ID to use connecting to
          Google Cloud Platform.
      :type gcp_conn_id: str
      :param delegate_to: The account to impersonate, if any.
          For this to work, the service account making the request
          must have domain-wide delegation enabled.
      :type delegate_to: str
      :param push_config: 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.
      :type push_config: Union[Dict, google.cloud.pubsub_v1.types.PushConfig]
      :param retain_acked_messages: 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
          ``message_retention_duration`` window. This must be true if you would
          like to Seek to a timestamp.
      :type retain_acked_messages: bool
      :param message_retention_duration: How long to retain unacknowledged messages
          in the subscription's backlog, from the moment a message is published. If
          ``retain_acked_messages`` is true, then this also configures the
          retention of acknowledged messages, and thus configures how far back in
          time a ``Seek`` can be done. Defaults to 7 days. Cannot be more than 7
          days or less than 10 minutes.
      :type message_retention_duration: Union[Dict, google.cloud.pubsub_v1.types.Duration]
      :param labels: Client-assigned labels; see
          https://cloud.google.com/pubsub/docs/labels
      :type labels: Dict[str, str]
      :param enable_message_ordering: If true, messages published with the same
          ordering_key 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.
      :type enable_message_ordering: bool
      :param expiration_policy: 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 expiration_policy is not set,
          a default policy with ttl of 31 days will be used. The minimum allowed value for
          expiration_policy.ttl is 1 day.
      :type expiration_policy: Union[Dict, google.cloud.pubsub_v1.types.ExpirationPolicy`]
      :param filter_: An expression written in the Cloud Pub/Sub filter language. If
          non-empty, then only PubsubMessages whose attributes field matches the filter are
          delivered on this subscription. If empty, then no messages are filtered out.
      :type filter_: str
      :param dead_letter_policy: A policy that specifies the conditions for dead lettering
          messages in this subscription. If dead_letter_policy is not set, dead lettering is
          disabled.
      :type dead_letter_policy: Union[Dict, google.cloud.pubsub_v1.types.DeadLetterPolicy]
      :param retry_policy: 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 acknowledgement deadline
          exceeded events for a given message.
      :type retry_policy: Union[Dict, google.cloud.pubsub_v1.types.RetryPolicy]
      :param retry: (Optional) 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: (Optional) 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: (Optional) Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]]
      :param topic_project: (Deprecated) the GCP project ID where the topic exists
      :type topic_project: str
      :param subscription_project: (Deprecated) the GCP project ID where the subscription
          will be created. If empty, ``topic_project`` will be used.
      :type subscription_project: str
      """
      template_fields = ['project_id', 'topic', 'subscription', 'subscription_project_id']
      ui_color = '#0273d4'
  
      # pylint: disable=too-many-arguments
      @apply_defaults
      def __init__(
          self, *,
          topic: str,
          project_id: Optional[str] = None,
          subscription: Optional[str] = None,
          subscription_project_id: Optional[str] = None,
          ack_deadline_secs: int = 10,
          fail_if_exists: bool = False,
          gcp_conn_id: str = 'google_cloud_default',
          delegate_to: Optional[str] = None,
          push_config: Optional[Union[Dict, PushConfig]] = None,
          retain_acked_messages: Optional[bool] = None,
          message_retention_duration: Optional[Union[Dict, Duration]] = None,
          labels: Optional[Dict[str, str]] = None,
          enable_message_ordering: bool = False,
          expiration_policy: Optional[Union[Dict, ExpirationPolicy]] = None,
          filter_: Optional[str] = None,
          dead_letter_policy: Optional[Union[Dict, DeadLetterPolicy]] = None,
          retry_policy: Optional[Union[Dict, RetryPolicy]] = None,
          retry: Optional[Retry] = None,
          timeout: Optional[float] = None,
          metadata: Optional[Sequence[Tuple[str, str]]] = None,
          topic_project: Optional[str] = None,
          subscription_project: Optional[str] = None,
          **kwargs
      ) -> None:
  
          # To preserve backward compatibility
          # TODO: remove one day
          if topic_project:
              warnings.warn(
                  "The topic_project parameter has been deprecated. You should pass "
                  "the project_id parameter.", DeprecationWarning, stacklevel=2)
              project_id = topic_project
          if subscription_project:
              warnings.warn(
                  "The project_id parameter has been deprecated. You should pass "
                  "the subscription_project parameter.", DeprecationWarning, stacklevel=2)
              subscription_project_id = subscription_project
  
          super().__init__(**kwargs)
          self.project_id = project_id
          self.topic = topic
          self.subscription = subscription
          self.subscription_project_id = subscription_project_id
          self.ack_deadline_secs = ack_deadline_secs
          self.fail_if_exists = fail_if_exists
          self.gcp_conn_id = gcp_conn_id
          self.delegate_to = delegate_to
          self.push_config = push_config
          self.retain_acked_messages = retain_acked_messages
          self.message_retention_duration = message_retention_duration
          self.labels = labels
          self.enable_message_ordering = enable_message_ordering
          self.expiration_policy = expiration_policy
          self.filter_ = filter_
          self.dead_letter_policy = dead_letter_policy
          self.retry_policy = retry_policy
          self.retry = retry
          self.timeout = timeout
          self.metadata = metadata
  
      def execute(self, context):
          hook = PubSubHook(gcp_conn_id=self.gcp_conn_id,
                            delegate_to=self.delegate_to)
  
          self.log.info("Creating subscription for topic %s", self.topic)
          result = hook.create_subscription(
              project_id=self.project_id,
              topic=self.topic,
              subscription=self.subscription,
              subscription_project_id=self.subscription_project_id,
              ack_deadline_secs=self.ack_deadline_secs,
              fail_if_exists=self.fail_if_exists,
              push_config=self.push_config,
              retain_acked_messages=self.retain_acked_messages,
              message_retention_duration=self.message_retention_duration,
              labels=self.labels,
              enable_message_ordering=self.enable_message_ordering,
              expiration_policy=self.expiration_policy,
              filter_=self.filter_,
              dead_letter_policy=self.dead_letter_policy,
              retry_policy=self.retry_policy,
              retry=self.retry,
              timeout=self.timeout,
              metadata=self.metadata
          )
  
          self.log.info("Created subscription for topic %s", self.topic)
          return result
  
  
  class PubSubDeleteTopicOperator(BaseOperator):
      """Delete a PubSub topic.
  
      .. seealso::
          For more information on how to use this operator, take a look at the guide:
          :ref:`howto/operator:PubSubDeleteTopicOperator`
  
      By default, if the topic does not exist, this operator will
      not cause the DAG to fail. ::
  
          with DAG('successful DAG') as dag:
              (
                  PubSubTopicDeleteOperator(project='my-project',
                                               topic='non_existing_topic')
              )
  
      The operator can be configured to fail if the topic does not exist. ::
  
          with DAG('failing DAG') as dag:
              (
                  PubSubTopicCreateOperator(project='my-project',
                                               topic='non_existing_topic',
                                               fail_if_not_exists=True)
              )
  
      Both ``project`` and ``topic`` are templated so you can use
      variables in them.
  
      :param project_id: Optional, the GCP project ID in which to work (templated).
          If set to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param topic: the topic to delete. Do not include the
          full topic path. In other words, instead of
          ``projects/{project}/topics/{topic}``, provide only
          ``{topic}``. (templated)
      :type topic: str
      :param fail_if_not_exists: If True and the topic does not exist, fail
          the task
      :type fail_if_not_exists: bool
      :param gcp_conn_id: The connection ID to use connecting to
          Google Cloud Platform.
      :type gcp_conn_id: str
      :param delegate_to: The account to impersonate, if any.
          For this to work, the service account making the request
          must have domain-wide delegation enabled.
      :type delegate_to: str
      :param retry: (Optional) 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: (Optional) 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: (Optional) Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]]
      :param project: (Deprecated) the GCP project ID where the topic will be created
      :type project: str
      """
      template_fields = ['project_id', 'topic']
      ui_color = '#cb4335'
  
      @apply_defaults
      def __init__(
          self, *,
          topic: str,
          project_id: Optional[str] = None,
          fail_if_not_exists: bool = False,
          gcp_conn_id: str = 'google_cloud_default',
          delegate_to: Optional[str] = None,
          retry: Optional[Retry] = None,
          timeout: Optional[float] = None,
          metadata: Optional[Sequence[Tuple[str, str]]] = None,
          project: Optional[str] = None,
          **kwargs
      ) -> None:
          # To preserve backward compatibility
          # TODO: remove one day
          if project:
              warnings.warn(
                  "The project parameter has been deprecated. You should pass "
                  "the project_id parameter.", DeprecationWarning, stacklevel=2)
              project_id = project
  
          super().__init__(**kwargs)
          self.project_id = project_id
          self.topic = topic
          self.fail_if_not_exists = fail_if_not_exists
          self.gcp_conn_id = gcp_conn_id
          self.delegate_to = delegate_to
          self.retry = retry
          self.timeout = timeout
          self.metadata = metadata
  
      def execute(self, context):
          hook = PubSubHook(gcp_conn_id=self.gcp_conn_id,
                            delegate_to=self.delegate_to)
  
          self.log.info("Deleting topic %s", self.topic)
          hook.delete_topic(
              project_id=self.project_id,
              topic=self.topic,
              fail_if_not_exists=self.fail_if_not_exists,
              retry=self.retry,
              timeout=self.timeout,
              metadata=self.metadata
          )
          self.log.info("Deleted topic %s", self.topic)
  
  
  class PubSubDeleteSubscriptionOperator(BaseOperator):
      """Delete a PubSub subscription.
  
      .. seealso::
          For more information on how to use this operator, take a look at the guide:
          :ref:`howto/operator:PubSubDeleteSubscriptionOperator`
  
      By default, if the subscription does not exist, this operator will
      not cause the DAG to fail. ::
  
          with DAG('successful DAG') as dag:
              (
                  PubSubSubscriptionDeleteOperator(project='my-project',
                                                      subscription='non-existing')
              )
  
      The operator can be configured to fail if the subscription already exists.
  
      ::
  
          with DAG('failing DAG') as dag:
              (
                  PubSubSubscriptionDeleteOperator(
                       project='my-project', subscription='non-existing',
                       fail_if_not_exists=True)
              )
  
      ``project``, and ``subscription`` are templated so you can use
      variables in them.
  
      :param project_id: Optional, the GCP project ID in which to work (templated).
          If set to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param subscription: the subscription to delete. Do not include the
          full subscription path. In other words, instead of
          ``projects/{project}/subscription/{subscription}``, provide only
          ``{subscription}``. (templated)
      :type subscription: str
      :param fail_if_not_exists: If True and the subscription does not exist,
          fail the task
      :type fail_if_not_exists: bool
      :param gcp_conn_id: The connection ID to use connecting to
          Google Cloud Platform.
      :type gcp_conn_id: str
      :param delegate_to: The account to impersonate, if any.
          For this to work, the service account making the request
          must have domain-wide delegation enabled.
      :type delegate_to: str
      :param retry: (Optional) 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: (Optional) 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: (Optional) Additional metadata that is provided to the method.
      :type metadata: Sequence[Tuple[str, str]]]
      :param project: (Deprecated) the GCP project ID where the topic will be created
      :type project: str
      """
      template_fields = ['project_id', 'subscription']
      ui_color = '#cb4335'
  
      @apply_defaults
      def __init__(
          self, *,
          subscription: str,
          project_id: Optional[str] = None,
          fail_if_not_exists: bool = False,
          gcp_conn_id: str = 'google_cloud_default',
          delegate_to: Optional[str] = None,
          retry: Optional[Retry] = None,
          timeout: Optional[float] = None,
          metadata: Optional[Sequence[Tuple[str, str]]] = None,
          project: Optional[str] = None,
          **kwargs
      ) -> None:
          # To preserve backward compatibility
          # TODO: remove one day
          if project:
              warnings.warn(
                  "The project parameter has been deprecated. You should pass "
                  "the project_id parameter.", DeprecationWarning, stacklevel=2)
              project_id = project
  
          super().__init__(**kwargs)
          self.project_id = project_id
          self.subscription = subscription
          self.fail_if_not_exists = fail_if_not_exists
          self.gcp_conn_id = gcp_conn_id
          self.delegate_to = delegate_to
          self.retry = retry
          self.timeout = timeout
          self.metadata = metadata
  
      def execute(self, context):
          hook = PubSubHook(gcp_conn_id=self.gcp_conn_id,
                            delegate_to=self.delegate_to)
  
          self.log.info("Deleting subscription %s", self.subscription)
          hook.delete_subscription(
              project_id=self.project_id,
              subscription=self.subscription,
              fail_if_not_exists=self.fail_if_not_exists,
              retry=self.retry,
              timeout=self.timeout,
              metadata=self.metadata
          )
          self.log.info("Deleted subscription %s", self.subscription)
  
  
  class PubSubPublishMessageOperator(BaseOperator):
      """Publish messages to a PubSub topic.
  
      .. seealso::
          For more information on how to use this operator, take a look at the guide:
          :ref:`howto/operator:PubSubPublishMessageOperator`
  
      Each Task publishes all provided messages to the same topic
      in a single GCP project. If the topic does not exist, this
      task will fail. ::
  
          m1 = {'data': b'Hello, World!',
                'attributes': {'type': 'greeting'}
               }
          m2 = {'data': b'Knock, knock'}
          m3 = {'attributes': {'foo': ''}}
  
          t1 = PubSubPublishOperator(
              project='my-project',topic='my_topic',
              messages=[m1, m2, m3],
              create_topic=True,
              dag=dag)
  
      ``project`` , ``topic``, and ``messages`` are templated so you can use
      variables in them.
  
      :param project_id: Optional, the GCP project ID in which to work (templated).
          If set to None or missing, the default project_id from the GCP connection is used.
      :type project_id: str
      :param topic: the topic to which to publish. Do not include the
          full topic path. In other words, instead of
          ``projects/{project}/topics/{topic}``, provide only
          ``{topic}``. (templated)
      :type topic: str
      :param messages: a list of messages to be published to the
          topic. Each message is a dict with one or more of the
          following keys-value mappings:
          * 'data': a bytestring (utf-8 encoded)
          * 'attributes': {'key1': 'value1', ...}
          Each message must contain at least a non-empty 'data' value
          or an attribute dict with at least one key (templated). See
          https://cloud.google.com/pubsub/docs/reference/rest/v1/PubsubMessage
      :type messages: list
      :param gcp_conn_id: The connection ID to use connecting to
          Google Cloud Platform.
      :type gcp_conn_id: str
      :param delegate_to: The account to impersonate, if any.
          For this to work, the service account making the request
          must have domain-wide delegation enabled.
      :type delegate_to: str
      :param project: (Deprecated) the GCP project ID where the topic will be created
      :type project: str
      """
      template_fields = ['project_id', 'topic', 'messages']
      ui_color = '#0273d4'
  
      @apply_defaults
      def __init__(
          self, *,
          topic: str,
          messages: List,
          project_id: Optional[str] = None,
          gcp_conn_id: str = 'google_cloud_default',
          delegate_to: Optional[str] = None,
          project: Optional[str] = None,
          **kwargs
      ) -> None:
          # To preserve backward compatibility
          # TODO: remove one day
          if project:
              warnings.warn(
                  "The project parameter has been deprecated. You should pass "
                  "the project_id parameter.", DeprecationWarning, stacklevel=2)
              project_id = project
  
          super().__init__(**kwargs)
          self.project_id = project_id
          self.topic = topic
          self.messages = messages
          self.gcp_conn_id = gcp_conn_id
          self.delegate_to = delegate_to
  
      def execute(self, context):
          hook = PubSubHook(gcp_conn_id=self.gcp_conn_id,
                            delegate_to=self.delegate_to)
  
          self.log.info("Publishing to topic %s", self.topic)
          hook.publish(project_id=self.project_id, topic=self.topic, messages=self.messages)
          self.log.info("Published to topic %s", self.topic)
  
  
  class PubSubPullOperator(BaseOperator):
      """Pulls messages from a PubSub subscription and passes them through XCom.
      If the queue is empty, returns empty list - never waits for messages.
      If you do need to wait, please use :class:`airflow.providers.google.cloud.sensors.PubSubPullSensor`
      instead.
  
      .. seealso::
          For more information on how to use this operator, take a look at the guide:
          :ref:`howto/operator:PubSubPullSensor`
  
      This sensor operator will pull up to ``max_messages`` messages from the
      specified PubSub subscription. When the subscription returns messages,
      the poke method's criteria will be fulfilled and the messages will be
      returned from the operator and passed through XCom for downstream tasks.
  
      If ``ack_messages`` is set to True, messages will be immediately
      acknowledged before being returned, otherwise, downstream tasks will be
      responsible for acknowledging them.
  
      ``project`` and ``subscription`` are templated so you can use
      variables in them.
  
      :param project: the GCP project ID for the subscription (templated)
      :type project: str
      :param subscription: the Pub/Sub subscription name. Do not include the
          full subscription path.
      :type subscription: str
      :param max_messages: The maximum number of messages to retrieve per
          PubSub pull request
      :type max_messages: int
      :param ack_messages: If True, each message will be acknowledged
          immediately rather than by any downstream tasks
      :type ack_messages: bool
      :param gcp_conn_id: The connection ID to use connecting to
          Google Cloud Platform.
      :type gcp_conn_id: str
      :param delegate_to: The account to impersonate, if any.
          For this to work, the service account making the request
          must have domain-wide delegation enabled.
      :type delegate_to: str
      :param messages_callback: (Optional) Callback to process received messages.
          It's return value will be saved to XCom.
          If you are pulling large messages, you probably want to provide a custom callback.
          If not provided, the default implementation will convert `ReceivedMessage` objects
          into JSON-serializable dicts using `google.protobuf.json_format.MessageToDict` function.
      :type messages_callback: Optional[Callable[[List[ReceivedMessage], Dict[str, Any]], Any]]
      """
      template_fields = ['project_id', 'subscription']
  
      @apply_defaults
      def __init__(
          self, *,
          project_id: str,
          subscription: str,
          max_messages: int = 5,
          ack_messages: bool = False,
          messages_callback: Optional[Callable[[List[ReceivedMessage], Dict[str, Any]], Any]] = None,
          gcp_conn_id: str = 'google_cloud_default',
          delegate_to: Optional[str] = None,
          **kwargs
      ) -> None:
          super().__init__(**kwargs)
          self.gcp_conn_id = gcp_conn_id
          self.delegate_to = delegate_to
          self.project_id = project_id
          self.subscription = subscription
          self.max_messages = max_messages
          self.ack_messages = ack_messages
          self.messages_callback = messages_callback
  
      def execute(self, context):
          hook = PubSubHook(
              gcp_conn_id=self.gcp_conn_id,
              delegate_to=self.delegate_to,
          )
  
          pulled_messages = hook.pull(
              project_id=self.project_id,
              subscription=self.subscription,
              max_messages=self.max_messages,
              return_immediately=True,
          )
  
          handle_messages = self.messages_callback or self._default_message_callback
  
          ret = handle_messages(pulled_messages, context)
  
          if pulled_messages and self.ack_messages:
              hook.acknowledge(
                  project_id=self.project_id,
                  subscription=self.subscription,
                  messages=pulled_messages,
              )
  
          return ret
  
      def _default_message_callback(
          self,
          pulled_messages: List[ReceivedMessage],
          context: Dict[str, Any],  # pylint: disable=unused-argument
      ):
          """
          This method can be overridden by subclasses or by `messages_callback` constructor argument.
          This default implementation converts `ReceivedMessage` objects into JSON-serializable dicts.
  
          :param pulled_messages: messages received from the topic.
          :type pulled_messages: List[ReceivedMessage]
          :param context: same as in `execute`
          :return: value to be saved to XCom.
          """
  
          messages_json = [
              MessageToDict(m)
              for m in pulled_messages
          ]
  
          return messages_json
  