text: # -------------------------------------------------------------------------
  # Copyright (c) Microsoft Corporation. All rights reserved.
  # Licensed under the MIT License. See License.txt in the project root for
  # license information.
  # --------------------------------------------------------------------------
  """This module contains user-facing asynchronous clients for the
  Azure IoTHub Device SDK for Python.
  """
  
  import logging
  import asyncio
  import deprecation
  from azure.iot.device.common import async_adapter
  from azure.iot.device.iothub.abstract_clients import (
      AbstractIoTHubClient,
      AbstractIoTHubDeviceClient,
      AbstractIoTHubModuleClient,
  )
  from azure.iot.device.iothub.models import Message
  from azure.iot.device.iothub.pipeline import constant
  from azure.iot.device.iothub.pipeline import exceptions as pipeline_exceptions
  from azure.iot.device import exceptions
  from azure.iot.device.iothub.inbox_manager import InboxManager
  from .async_inbox import AsyncClientInbox
  from . import async_handler_manager, loop_management
  from azure.iot.device import constant as device_constant
  
  logger = logging.getLogger(__name__)
  
  
  async def handle_result(callback):
      try:
          return await callback.completion()
      except pipeline_exceptions.ConnectionDroppedError as e:
          raise exceptions.ConnectionDroppedError(message="Lost connection to IoTHub", cause=e)
      except pipeline_exceptions.ConnectionFailedError as e:
          raise exceptions.ConnectionFailedError(message="Could not connect to IoTHub", cause=e)
      except pipeline_exceptions.NoConnectionError as e:
          raise exceptions.NoConnectionError(message="Client is not connected to IoTHub", cause=e)
      except pipeline_exceptions.UnauthorizedError as e:
          raise exceptions.CredentialError(message="Credentials invalid, could not connect", cause=e)
      except pipeline_exceptions.ProtocolClientError as e:
          raise exceptions.ClientError(message="Error in the IoTHub client", cause=e)
      except pipeline_exceptions.TlsExchangeAuthError as e:
          raise exceptions.ClientError(
              message="Error in the IoTHub client due to TLS exchanges.", cause=e
          )
      except pipeline_exceptions.ProtocolProxyError as e:
          raise exceptions.ClientError(
              message="Error in the IoTHub client raised due to proxy connections.", cause=e
          )
      except pipeline_exceptions.PipelineNotRunning as e:
          raise exceptions.ClientError(message="Client has already been shut down", cause=e)
      except Exception as e:
          raise exceptions.ClientError(message="Unexpected failure", cause=e)
  
  
  class GenericIoTHubClient(AbstractIoTHubClient):
      """A super class representing a generic asynchronous client.
      This class needs to be extended for specific clients.
      """
  
      def __init__(self, **kwargs):
          """Initializer for a generic asynchronous client.
  
          This initializer should not be called directly.
          Instead, use one of the 'create_from_' classmethods to instantiate
  
          :param mqtt_pipeline: The MQTTPipeline used for the client
          :type mqtt_pipeline: :class:`azure.iot.device.iothub.pipeline.MQTTPipeline`
          :param http_pipeline: The HTTPPipeline used for the client
          :type http_pipeline: :class:`azure.iot.device.iothub.pipeline.HTTPPipeline`
          """
          # Depending on the subclass calling this __init__, there could be different arguments,
          # and the super() call could call a different class, due to the different MROs
          # in the class hierarchies of different clients. Thus, args here must be passed along as
          # **kwargs.
          super().__init__(**kwargs)
          self._inbox_manager = InboxManager(inbox_type=AsyncClientInbox)
          self._handler_manager = async_handler_manager.AsyncHandlerManager(self._inbox_manager)
  
          # Set pipeline handlers
          self._mqtt_pipeline.on_connected = self._on_connected
          self._mqtt_pipeline.on_disconnected = self._on_disconnected
          self._mqtt_pipeline.on_method_request_received = self._inbox_manager.route_method_request
          self._mqtt_pipeline.on_twin_patch_received = self._inbox_manager.route_twin_patch
  
      async def _enable_feature(self, feature_name):
          """Enable an Azure IoT Hub feature
  
          :param feature_name: The name of the feature to enable.
              See azure.iot.device.common.pipeline.constant for possible values.
          """
          logger.info("Enabling feature:" + feature_name + "...")
          if not self._mqtt_pipeline.feature_enabled[feature_name]:
              # Enable the feature if not already enabled
              enable_feature_async = async_adapter.emulate_async(self._mqtt_pipeline.enable_feature)
  
              callback = async_adapter.AwaitableCallback()
              await enable_feature_async(feature_name, callback=callback)
              await handle_result(callback)
  
              logger.info("Successfully enabled feature:" + feature_name)
          else:
              # This branch shouldn't be reached, but in case it is, log it
              logger.info("Feature ({}) already enabled - skipping".format(feature_name))
  
      async def _disable_feature(self, feature_name):
          """Disable an Azure IoT Hub feature
  
          :param feature_name: The name of the feature to enable.
              See azure.iot.device.common.pipeline.constant for possible values.
          """
          logger.info("Disabling feature: {}...".format(feature_name))
          if self._mqtt_pipeline.feature_enabled[feature_name]:
              # Disable the feature if not already disabled
              disable_feature_async = async_adapter.emulate_async(self._mqtt_pipeline.disable_feature)
  
              callback = async_adapter.AwaitableCallback()
              await disable_feature_async(feature_name, callback=callback)
              await handle_result(callback)
  
              logger.info("Successfully disabled feature: {}".format(feature_name))
          else:
              # This branch shouldn't be reached, but in case it is, log it
              logger.info("Feature ({}) already disabled - skipping".format(feature_name))
  
      async def shutdown(self):
          """Shut down the client for graceful exit.
  
          Once this method is called, any attempts at further client calls will result in a
          ClientError being raised
  
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          """
          logger.info("Initiating client shutdown")
          # Note that client disconnect does the following:
          #   - Disconnects the pipeline
          #   - Resolves all pending handler calls
          #   - Stops handler threads
          await self.disconnect()
  
          # Note that shutting down does the following:
          #   - Disconnects the MQTT pipeline
          #   - Stops MQTT pipeline threads
          logger.debug("Beginning pipeline shutdown operation")
          shutdown_async = async_adapter.emulate_async(self._mqtt_pipeline.shutdown)
          callback = async_adapter.AwaitableCallback()
          await shutdown_async(callback=callback)
          await handle_result(callback)
          logger.debug("Completed pipeline shutdown operation")
  
          # Yes, that means the pipeline is disconnected twice (well, actually three times if you
          # consider that the client-level disconnect causes two pipeline-level disconnects for
          # reasons explained in comments in the client's .disconnect() method).
          #
          # This last disconnect that occurs as a result of the pipeline shutdown is a bit different
          # from the first though, in that it's more "final" and can't simply just be reconnected.
  
          # Note also that only the MQTT pipeline is shut down. The reason is twofold:
          #   1. There are no known issues related to graceful exit if the HTTP pipeline is not
          #      explicitly shut down
          #   2. The HTTP pipeline is planned for eventual removal from the client
          # In light of these two facts, it seemed irrelevant to spend time implementing shutdown
          # capability for HTTP pipeline.
          logger.info("Client shutdown complete")
  
      async def connect(self):
          """Connects the client to an Azure IoT Hub or Azure IoT Edge Hub instance.
  
          The destination is chosen based on the credentials passed via the auth_provider parameter
          that was provided when this object was initialized.
  
          :raises: :class:`azure.iot.device.exceptions.CredentialError` if credentials are invalid
              and a connection cannot be established.
          :raises: :class:`azure.iot.device.exceptions.ConnectionFailedError` if a establishing a
              connection results in failure.
          :raises: :class:`azure.iot.device.exceptions.ConnectionDroppedError` if connection is lost
              during execution.
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          """
          logger.info("Connecting to Hub...")
          connect_async = async_adapter.emulate_async(self._mqtt_pipeline.connect)
  
          callback = async_adapter.AwaitableCallback()
          await connect_async(callback=callback)
          await handle_result(callback)
  
          logger.info("Successfully connected to Hub")
  
      async def disconnect(self):
          """Disconnect the client from the Azure IoT Hub or Azure IoT Edge Hub instance.
  
          It is recommended that you make sure to call this coroutine when you are completely done
          with the your client instance.
  
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          """
          logger.info("Disconnecting from Hub...")
  
          logger.debug("Executing initial disconnect")
          disconnect_async = async_adapter.emulate_async(self._mqtt_pipeline.disconnect)
          callback = async_adapter.AwaitableCallback()
          await disconnect_async(callback=callback)
          await handle_result(callback)
          logger.debug("Successfully executed initial disconnect")
  
          # Note that in the process of stopping the handlers and resolving pending calls
          # a user-supplied handler may cause a reconnection to occur
          logger.debug("Stopping handlers...")
          self._handler_manager.stop()
          logger.debug("Successfully stopped handlers")
  
          # Disconnect again to ensure disconnection has ocurred due to the issue mentioned above
          logger.debug("Executing secondary disconnect...")
          disconnect_async = async_adapter.emulate_async(self._mqtt_pipeline.disconnect)
          callback = async_adapter.AwaitableCallback()
          await disconnect_async(callback=callback)
          await handle_result(callback)
          logger.debug("Successfully executed secondary disconnect")
  
          # It's also possible that in the (very short) time between stopping the handlers and
          # the second disconnect, additional items were received (e.g. C2D Message)
          # Currently, this isn't really possible to accurately check due to a
          # race condition / thread timing issue with inboxes where we can't guarantee how many
          # items are truly in them.
          # It has always been true of this client, even before handlers.
          #
          # However, even if the race condition is addressed, that will only allow us to log that
          # messages were lost. To actually fix the problem, IoTHub needs to support MQTT5 so that
          # we can unsubscribe from receiving data.
  
          logger.info("Successfully disconnected from Hub")
  
      async def update_sastoken(self, sastoken):
          """
          Update the client's SAS Token used for authentication, then reauthorizes the connection.
  
          This API can only be used if the client was initially created with a SAS Token.
          Note also that this API may return before the reauthorization/reconnection is completed.
          This means that some errors that may occur as part of the reconnection could occur in the
          background, and will not be raised by this method.
  
          :param str sastoken: The new SAS Token string for the client to use
  
          :raises: :class:`azure.iot.device.exceptions.ClientError` if the client was not initially
              created with a SAS token.
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          :raises: ValueError if the sastoken parameter is invalid
          """
          self._replace_user_supplied_sastoken(sastoken)
  
          # Reauthorize the connection
          logger.info("Reauthorizing connection with Hub...")
          reauth_connection_async = async_adapter.emulate_async(
              self._mqtt_pipeline.reauthorize_connection
          )
          callback = async_adapter.AwaitableCallback()
          await reauth_connection_async(callback=callback)
          await handle_result(callback)
          # NOTE: Currently due to the MQTT3 implemenation, the pipeline reauthorization will return
          # after the disconnect. It does not wait for the reconnect to complete. This means that
          # any errors that may occur as part of the connect will not return via this callback.
          # They will instead go to the background exception handler.
  
          logger.info("Successfully reauthorized connection to Hub")
  
      async def send_message(self, message):
          """Sends a message to the default events endpoint on the Azure IoT Hub or Azure IoT Edge Hub instance.
  
          If the connection to the service has not previously been opened by a call to connect, this
          function will open the connection before sending the event.
  
          :param message: The actual message to send. Anything passed that is not an instance of the
              Message class will be converted to Message object.
          :type message: :class:`azure.iot.device.Message` or str
  
          :raises: :class:`azure.iot.device.exceptions.CredentialError` if credentials are invalid
              and a connection cannot be established.
          :raises: :class:`azure.iot.device.exceptions.ConnectionFailedError` if a establishing a
              connection results in failure.
          :raises: :class:`azure.iot.device.exceptions.ConnectionDroppedError` if connection is lost
              during execution.
          :raises: :class:`azure.iot.device.exceptions.NoConnectionError` if the client is not
              connected (and there is no auto-connect enabled)
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          :raises: ValueError if the message fails size validation.
          """
          if not isinstance(message, Message):
              message = Message(message)
  
          if message.get_size() > device_constant.TELEMETRY_MESSAGE_SIZE_LIMIT:
              raise ValueError("Size of telemetry message can not exceed 256 KB.")
  
          logger.info("Sending message to Hub...")
          send_message_async = async_adapter.emulate_async(self._mqtt_pipeline.send_message)
  
          callback = async_adapter.AwaitableCallback()
          await send_message_async(message, callback=callback)
          await handle_result(callback)
  
          logger.info("Successfully sent message to Hub")
  
      @deprecation.deprecated(
          deprecated_in="2.3.0",
          current_version=device_constant.VERSION,
          details="We recommend that you use the .on_method_request_received property to set a handler instead",
      )
      async def receive_method_request(self, method_name=None):
          """Receive a method request via the Azure IoT Hub or Azure IoT Edge Hub.
  
          If no method request is yet available, will wait until it is available.
  
          :param str method_name: Optionally provide the name of the method to receive requests for.
              If this parameter is not given, all methods not already being specifically targeted by
              a different call to receive_method will be received.
  
          :returns: MethodRequest object representing the received method request.
          :rtype: :class:`azure.iot.device.MethodRequest`
          """
          self._check_receive_mode_is_api()
  
          if not self._mqtt_pipeline.feature_enabled[constant.METHODS]:
              await self._enable_feature(constant.METHODS)
  
          method_inbox = self._inbox_manager.get_method_request_inbox(method_name)
  
          logger.info("Waiting for method request...")
          method_request = await method_inbox.get()
          logger.info("Received method request")
          return method_request
  
      async def send_method_response(self, method_response):
          """Send a response to a method request via the Azure IoT Hub or Azure IoT Edge Hub.
  
          If the connection to the service has not previously been opened by a call to connect, this
          function will open the connection before sending the event.
  
          :param method_response: The MethodResponse to send
          :type method_response: :class:`azure.iot.device.MethodResponse`
  
          :raises: :class:`azure.iot.device.exceptions.CredentialError` if credentials are invalid
              and a connection cannot be established.
          :raises: :class:`azure.iot.device.exceptions.ConnectionFailedError` if a establishing a
              connection results in failure.
          :raises: :class:`azure.iot.device.exceptions.ConnectionDroppedError` if connection is lost
              during execution.
          :raises: :class:`azure.iot.device.exceptions.NoConnectionError` if the client is not
              connected (and there is no auto-connect enabled)
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          """
          logger.info("Sending method response to Hub...")
          send_method_response_async = async_adapter.emulate_async(
              self._mqtt_pipeline.send_method_response
          )
  
          callback = async_adapter.AwaitableCallback()
  
          # TODO: maybe consolidate method_request, result and status into a new object
          await send_method_response_async(method_response, callback=callback)
          await handle_result(callback)
  
          logger.info("Successfully sent method response to Hub")
  
      async def get_twin(self):
          """
          Gets the device or module twin from the Azure IoT Hub or Azure IoT Edge Hub service.
  
          :returns: Complete Twin as a JSON dict
          :rtype: dict
  
          :raises: :class:`azure.iot.device.exceptions.CredentialError` if credentials are invalid
              and a connection cannot be established.
          :raises: :class:`azure.iot.device.exceptions.ConnectionFailedError` if a establishing a
              connection results in failure.
          :raises: :class:`azure.iot.device.exceptions.ConnectionDroppedError` if connection is lost
              during execution.
          :raises: :class:`azure.iot.device.exceptions.NoConnectionError` if the client is not
              connected (and there is no auto-connect enabled)
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          """
          logger.info("Getting twin")
  
          if not self._mqtt_pipeline.feature_enabled[constant.TWIN]:
              await self._enable_feature(constant.TWIN)
  
          get_twin_async = async_adapter.emulate_async(self._mqtt_pipeline.get_twin)
  
          callback = async_adapter.AwaitableCallback(return_arg_name="twin")
          await get_twin_async(callback=callback)
          twin = await handle_result(callback)
          logger.info("Successfully retrieved twin")
          return twin
  
      async def patch_twin_reported_properties(self, reported_properties_patch):
          """
          Update reported properties with the Azure IoT Hub or Azure IoT Edge Hub service.
  
          If the service returns an error on the patch operation, this function will raise the
          appropriate error.
  
          :param reported_properties_patch: Twin Reported Properties patch as a JSON dict
          :type reported_properties_patch: dict
  
          :raises: :class:`azure.iot.device.exceptions.CredentialError` if credentials are invalid
              and a connection cannot be established.
          :raises: :class:`azure.iot.device.exceptions.ConnectionFailedError` if a establishing a
              connection results in failure.
          :raises: :class:`azure.iot.device.exceptions.ConnectionDroppedError` if connection is lost
              during execution.
          :raises: :class:`azure.iot.device.exceptions.NoConnectionError` if the client is not
              connected (and there is no auto-connect enabled)
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          """
          logger.info("Patching twin reported properties")
  
          if not self._mqtt_pipeline.feature_enabled[constant.TWIN]:
              await self._enable_feature(constant.TWIN)
  
          patch_twin_async = async_adapter.emulate_async(
              self._mqtt_pipeline.patch_twin_reported_properties
          )
  
          callback = async_adapter.AwaitableCallback()
          await patch_twin_async(patch=reported_properties_patch, callback=callback)
          await handle_result(callback)
  
          logger.info("Successfully sent twin patch")
  
      @deprecation.deprecated(
          deprecated_in="2.3.0",
          current_version=device_constant.VERSION,
          details="We recommend that you use the .on_twin_desired_properties_patch_received property to set a handler instead",
      )
      async def receive_twin_desired_properties_patch(self):
          """
          Receive a desired property patch via the Azure IoT Hub or Azure IoT Edge Hub.
  
          If no method request is yet available, will wait until it is available.
  
          :returns: Twin Desired Properties patch as a JSON dict
          :rtype: dict
          """
          self._check_receive_mode_is_api()
  
          if not self._mqtt_pipeline.feature_enabled[constant.TWIN_PATCHES]:
              await self._enable_feature(constant.TWIN_PATCHES)
          twin_patch_inbox = self._inbox_manager.get_twin_patch_inbox()
  
          logger.info("Waiting for twin patches...")
          patch = await twin_patch_inbox.get()
          logger.info("twin patch received")
          return patch
  
      def _generic_handler_setter(self, handler_name, feature_name, new_handler):
          self._check_receive_mode_is_handler()
          # Set the handler on the handler manager
          setattr(self._handler_manager, handler_name, new_handler)
  
          # Enable the feature if necessary
          if new_handler is not None and not self._mqtt_pipeline.feature_enabled[feature_name]:
              # We have to call this on a loop running on a different thread in order to ensure
              # the setter can be called both within a coroutine (with a running event loop) and
              # outside of a coroutine (where no event loop is currently running)
              loop = loop_management.get_client_internal_loop()
              fut = asyncio.run_coroutine_threadsafe(self._enable_feature(feature_name), loop=loop)
              fut.result()
  
          # Disable the feature if necessary
          elif new_handler is None and self._mqtt_pipeline.feature_enabled[feature_name]:
              # We have to call this on a loop running on a different thread in order to ensure
              # the setter can be called both within a coroutine (with a running event loop) and
              # outside of a coroutine (where no event loop is currently running)
              loop = loop_management.get_client_internal_loop()
              fut = asyncio.run_coroutine_threadsafe(self._disable_feature(feature_name), loop=loop)
              fut.result()
  
      @property
      def on_twin_desired_properties_patch_received(self):
          """The handler function or coroutine that will be called when a twin desired properties
          patch is received.
  
          The function or coroutine definition should take one positional argument (the twin patch
          in the form of a JSON dictionary object)"""
          return self._handler_manager.on_twin_desired_properties_patch_received
  
      @on_twin_desired_properties_patch_received.setter
      def on_twin_desired_properties_patch_received(self, value):
          self._generic_handler_setter(
              "on_twin_desired_properties_patch_received", constant.TWIN_PATCHES, value
          )
  
      @property
      def on_method_request_received(self):
          """The handler function or coroutine that will be called when a method request is received.
  
          The function or coroutine definition should take one positional argument (the
          :class:`azure.iot.device.MethodRequest` object)"""
          return self._handler_manager.on_method_request_received
  
      @on_method_request_received.setter
      def on_method_request_received(self, value):
          self._generic_handler_setter("on_method_request_received", constant.METHODS, value)
  
  
  class IoTHubDeviceClient(GenericIoTHubClient, AbstractIoTHubDeviceClient):
      """An asynchronous device client that connects to an Azure IoT Hub instance.
  
      Intended for usage with Python 3.5.3+
      """
  
      def __init__(self, mqtt_pipeline, http_pipeline):
          """Initializer for a IoTHubDeviceClient.
  
          This initializer should not be called directly.
          Instead, use one of the 'create_from_' classmethods to instantiate
  
          :param mqtt_pipeline: The pipeline used to connect to the IoTHub endpoint.
          :type mqtt_pipeline: :class:`azure.iot.device.iothub.pipeline.MQTTPipeline`
          """
          super().__init__(mqtt_pipeline=mqtt_pipeline, http_pipeline=http_pipeline)
          self._mqtt_pipeline.on_c2d_message_received = self._inbox_manager.route_c2d_message
  
      @deprecation.deprecated(
          deprecated_in="2.3.0",
          current_version=device_constant.VERSION,
          details="We recommend that you use the .on_message_received property to set a handler instead",
      )
      async def receive_message(self):
          """Receive a message that has been sent from the Azure IoT Hub.
  
          If no message is yet available, will wait until an item is available.
  
          :returns: Message that was sent from the Azure IoT Hub.
          :rtype: :class:`azure.iot.device.Message`
          """
          self._check_receive_mode_is_api()
  
          if not self._mqtt_pipeline.feature_enabled[constant.C2D_MSG]:
              await self._enable_feature(constant.C2D_MSG)
          c2d_inbox = self._inbox_manager.get_c2d_message_inbox()
  
          logger.info("Waiting for message from Hub...")
          message = await c2d_inbox.get()
          logger.info("Message received")
          return message
  
      async def get_storage_info_for_blob(self, blob_name):
          """Sends a POST request over HTTP to an IoTHub endpoint that will return information for uploading via the Azure Storage Account linked to the IoTHub your device is connected to.
  
          :param str blob_name: The name in string format of the blob that will be uploaded using the storage API. This name will be used to generate the proper credentials for Storage, and needs to match what will be used with the Azure Storage SDK to perform the blob upload.
  
          :returns: A JSON-like (dictionary) object from IoT Hub that will contain relevant information including: correlationId, hostName, containerName, blobName, sasToken.
          """
          get_storage_info_for_blob_async = async_adapter.emulate_async(
              self._http_pipeline.get_storage_info_for_blob
          )
  
          callback = async_adapter.AwaitableCallback(return_arg_name="storage_info")
          await get_storage_info_for_blob_async(blob_name=blob_name, callback=callback)
          storage_info = await handle_result(callback)
          logger.info("Successfully retrieved storage_info")
          return storage_info
  
      async def notify_blob_upload_status(
          self, correlation_id, is_success, status_code, status_description
      ):
          """When the upload is complete, the device sends a POST request to the IoT Hub endpoint with information on the status of an upload to blob attempt. This is used by IoT Hub to notify listening clients.
  
          :param str correlation_id: Provided by IoT Hub on get_storage_info_for_blob request.
          :param bool is_success: A boolean that indicates whether the file was uploaded successfully.
          :param int status_code: A numeric status code that is the status for the upload of the fiel to storage.
          :param str status_description: A description that corresponds to the status_code.
          """
          notify_blob_upload_status_async = async_adapter.emulate_async(
              self._http_pipeline.notify_blob_upload_status
          )
  
          callback = async_adapter.AwaitableCallback()
          await notify_blob_upload_status_async(
              correlation_id=correlation_id,
              is_success=is_success,
              status_code=status_code,
              status_description=status_description,
              callback=callback,
          )
          await handle_result(callback)
          logger.info("Successfully notified blob upload status")
  
      @property
      def on_message_received(self):
          """The handler function or coroutine that will be called when a message is received.
  
          The function or coroutine definition should take one positional argument (the
          :class:`azure.iot.device.Message` object)"""
          return self._handler_manager.on_message_received
  
      @on_message_received.setter
      def on_message_received(self, value):
          self._generic_handler_setter("on_message_received", constant.C2D_MSG, value)
  
  
  class IoTHubModuleClient(GenericIoTHubClient, AbstractIoTHubModuleClient):
      """An asynchronous module client that connects to an Azure IoT Hub or Azure IoT Edge instance.
  
      Intended for usage with Python 3.5.3+
      """
  
      def __init__(self, mqtt_pipeline, http_pipeline):
          """Intializer for a IoTHubModuleClient.
  
          This initializer should not be called directly.
          Instead, use one of the 'create_from_' classmethods to instantiate
  
          :param mqtt_pipeline: The pipeline used to connect to the IoTHub endpoint.
          :type mqtt_pipeline: :class:`azure.iot.device.iothub.pipeline.MQTTPipeline`
          """
          super().__init__(mqtt_pipeline=mqtt_pipeline, http_pipeline=http_pipeline)
          self._mqtt_pipeline.on_input_message_received = self._inbox_manager.route_input_message
  
      async def send_message_to_output(self, message, output_name):
          """Sends an event/message to the given module output.
  
          These are outgoing events and are meant to be "output events"
  
          If the connection to the service has not previously been opened by a call to connect, this
          function will open the connection before sending the event.
  
          :param message: Message to send to the given output. Anything passed that is not an
              instance of the Message class will be converted to Message object.
          :type message: :class:`azure.iot.device.Message` or str
          :param str output_name: Name of the output to send the event to.
  
          :raises: :class:`azure.iot.device.exceptions.CredentialError` if credentials are invalid
              and a connection cannot be established.
          :raises: :class:`azure.iot.device.exceptions.ConnectionFailedError` if a establishing a
              connection results in failure.
          :raises: :class:`azure.iot.device.exceptions.ConnectionDroppedError` if connection is lost
              during execution.
          :raises: :class:`azure.iot.device.exceptions.NoConnectionError` if the client is not
              connected (and there is no auto-connect enabled)
          :raises: :class:`azure.iot.device.exceptions.ClientError` if there is an unexpected failure
              during execution.
          :raises: ValueError if the message fails size validation.
          """
          if not isinstance(message, Message):
              message = Message(message)
  
          if message.get_size() > device_constant.TELEMETRY_MESSAGE_SIZE_LIMIT:
              raise ValueError("Size of message can not exceed 256 KB.")
  
          message.output_name = output_name
  
          logger.info("Sending message to output:" + output_name + "...")
          send_output_message_async = async_adapter.emulate_async(
              self._mqtt_pipeline.send_output_message
          )
  
          callback = async_adapter.AwaitableCallback()
          await send_output_message_async(message, callback=callback)
          await handle_result(callback)
  
          logger.info("Successfully sent message to output: " + output_name)
  
      @deprecation.deprecated(
          deprecated_in="2.3.0",
          current_version=device_constant.VERSION,
          details="We recommend that you use the .on_message_received property to set a handler instead",
      )
      async def receive_message_on_input(self, input_name):
          """Receive an input message that has been sent from another Module to a specific input.
  
          If no message is yet available, will wait until an item is available.
  
          :param str input_name: The input name to receive a message on.
  
          :returns: Message that was sent to the specified input.
          :rtype: :class:`azure.iot.device.Message`
          """
          self._check_receive_mode_is_api()
  
          if not self._mqtt_pipeline.feature_enabled[constant.INPUT_MSG]:
              await self._enable_feature(constant.INPUT_MSG)
          inbox = self._inbox_manager.get_input_message_inbox(input_name)
  
          logger.info("Waiting for input message on: " + input_name + "...")
          message = await inbox.get()
          logger.info("Input message received on: " + input_name)
          return message
  
      async def invoke_method(self, method_params, device_id, module_id=None):
          """Invoke a method from your client onto a device or module client, and receive the response to the method call.
  
          :param dict method_params: Should contain a methodName (str), payload (str),
              connectTimeoutInSeconds (int), responseTimeoutInSeconds (int).
          :param str device_id: Device ID of the target device where the method will be invoked.
          :param str module_id: Module ID of the target module where the method will be invoked. (Optional)
  
          :returns: method_result should contain a status, and a payload
          :rtype: dict
          """
          logger.info(
              "Invoking {} method on {}{}".format(method_params["methodName"], device_id, module_id)
          )
  
          invoke_method_async = async_adapter.emulate_async(self._http_pipeline.invoke_method)
          callback = async_adapter.AwaitableCallback(return_arg_name="invoke_method_response")
          await invoke_method_async(device_id, method_params, callback=callback, module_id=module_id)
  
          method_response = await handle_result(callback)
          logger.info("Successfully invoked method")
          return method_response
  
      @property
      def on_message_received(self):
          """The handler function or coroutine that will be called when an input message is received.
  
          The function definitionor coroutine should take one positional argument (the
          :class:`azure.iot.device.Message` object)"""
          return self._handler_manager.on_message_received
  
      @on_message_received.setter
      def on_message_received(self, value):
          self._generic_handler_setter("on_message_received", constant.INPUT_MSG, value)
  