# Copyright 2020 Google LLC # # Licensed 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. """AsyncIO futures for long-running operations returned from Google Cloud APIs. These futures can be used to await for the result of a long-running operation using :meth:`AsyncOperation.result`: .. code-block:: python operation = my_api_client.long_running_method() result = await operation.result() Or asynchronously using callbacks and :meth:`Operation.add_done_callback`: .. code-block:: python operation = my_api_client.long_running_method() def my_callback(future): result = await future.result() operation.add_done_callback(my_callback) """ import functools import threading from google.api_core import exceptions from google.api_core import protobuf_helpers from google.api_core.future import async_future from google.longrunning import operations_pb2 from google.rpc import code_pb2 class AsyncOperation(async_future.AsyncFuture): """A Future for interacting with a Google API Long-Running Operation. Args: operation (google.longrunning.operations_pb2.Operation): The initial operation. refresh (Callable[[], ~.api_core.operation.Operation]): A callable that returns the latest state of the operation. cancel (Callable[[], None]): A callable that tries to cancel the operation. result_type (func:`type`): The protobuf type for the operation's result. metadata_type (func:`type`): The protobuf type for the operation's metadata. retry (google.api_core.retry.Retry): The retry configuration used when polling. This can be used to control how often :meth:`done` is polled. Regardless of the retry's ``deadline``, it will be overridden by the ``timeout`` argument to :meth:`result`. """ def __init__( self, operation, refresh, cancel, result_type, metadata_type=None, retry=async_future.DEFAULT_RETRY, ): super().__init__(retry=retry) self._operation = operation self._refresh = refresh self._cancel = cancel self._result_type = result_type self._metadata_type = metadata_type self._completion_lock = threading.Lock() # Invoke this in case the operation came back already complete. self._set_result_from_operation() @property def operation(self): """google.longrunning.Operation: The current long-running operation.""" return self._operation @property def metadata(self): """google.protobuf.Message: the current operation metadata.""" if not self._operation.HasField("metadata"): return None return protobuf_helpers.from_any_pb( self._metadata_type, self._operation.metadata ) @classmethod def deserialize(cls, payload): """Deserialize a ``google.longrunning.Operation`` protocol buffer. Args: payload (bytes): A serialized operation protocol buffer. Returns: ~.operations_pb2.Operation: An Operation protobuf object. """ return operations_pb2.Operation.FromString(payload) def _set_result_from_operation(self): """Set the result or exception from the operation if it is complete.""" # This must be done in a lock to prevent the async_future thread # and main thread from both executing the completion logic # at the same time. with self._completion_lock: # If the operation isn't complete or if the result has already been # set, do not call set_result/set_exception again. if not self._operation.done or self._future.done(): return if self._operation.HasField("response"): response = protobuf_helpers.from_any_pb( self._result_type, self._operation.response ) self.set_result(response) elif self._operation.HasField("error"): exception = exceptions.GoogleAPICallError( self._operation.error.message, errors=(self._operation.error,), response=self._operation, ) self.set_exception(exception) else: exception = exceptions.GoogleAPICallError( "Unexpected state: Long-running operation had neither " "response nor error set." ) self.set_exception(exception) async def _refresh_and_update(self, retry=async_future.DEFAULT_RETRY): """Refresh the operation and update the result if needed. Args: retry (google.api_core.retry.Retry): (Optional) How to retry the RPC. """ # If the currently cached operation is done, no need to make another # RPC as it will not change once done. if not self._operation.done: self._operation = await self._refresh(retry=retry) self._set_result_from_operation() async def done(self, retry=async_future.DEFAULT_RETRY): """Checks to see if the operation is complete. Args: retry (google.api_core.retry.Retry): (Optional) How to retry the RPC. Returns: bool: True if the operation is complete, False otherwise. """ await self._refresh_and_update(retry) return self._operation.done async def cancel(self): """Attempt to cancel the operation. Returns: bool: True if the cancel RPC was made, False if the operation is already complete. """ result = await self.done() if result: return False else: await self._cancel() return True async def cancelled(self): """True if the operation was cancelled.""" await self._refresh_and_update() return ( self._operation.HasField("error") and self._operation.error.code == code_pb2.CANCELLED ) def from_gapic(operation, operations_client, result_type, grpc_metadata=None, **kwargs): """Create an operation future from a gapic client. This interacts with the long-running operations `service`_ (specific to a given API) via a gapic client. .. _service: https://github.com/googleapis/googleapis/blob/\ 050400df0fdb16f63b63e9dee53819044bffc857/\ google/longrunning/operations.proto#L38 Args: operation (google.longrunning.operations_pb2.Operation): The operation. operations_client (google.api_core.operations_v1.OperationsClient): The operations client. result_type (:func:`type`): The protobuf result type. grpc_metadata (Optional[List[Tuple[str, str]]]): Additional metadata to pass to the rpc. kwargs: Keyword args passed into the :class:`Operation` constructor. Returns: ~.api_core.operation.Operation: The operation future to track the given operation. """ refresh = functools.partial( operations_client.get_operation, operation.name, metadata=grpc_metadata, ) cancel = functools.partial( operations_client.cancel_operation, operation.name, metadata=grpc_metadata, ) return AsyncOperation(operation, refresh, cancel, result_type, **kwargs)