Added delete option to database storage.

venv/Lib/site-packages/grpc/aio/_base_channel.py

@@ -0,0 +1,347 @@
+# Copyright 2020 The gRPC Authors
+#
+# 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.
+"""Abstract base classes for Channel objects and Multicallable objects."""
+
+import abc
+from typing import Any, Optional
+
+import grpc
+
+from . import _base_call
+from ._typing import (DeserializingFunction, RequestIterableType,
+                      SerializingFunction)
+from ._metadata import Metadata
+
+
+class UnaryUnaryMultiCallable(abc.ABC):
+    """Enables asynchronous invocation of a unary-call RPC."""
+
+    @abc.abstractmethod
+    def __call__(self,
+                 request: Any,
+                 *,
+                 timeout: Optional[float] = None,
+                 metadata: Optional[Metadata] = None,
+                 credentials: Optional[grpc.CallCredentials] = None,
+                 wait_for_ready: Optional[bool] = None,
+                 compression: Optional[grpc.Compression] = None
+                ) -> _base_call.UnaryUnaryCall:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.compression, e.g.
+            grpc.compression.Gzip. This is an EXPERIMENTAL option.
+
+        Returns:
+          A UnaryUnaryCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class UnaryStreamMultiCallable(abc.ABC):
+    """Enables asynchronous invocation of a server-streaming RPC."""
+
+    @abc.abstractmethod
+    def __call__(self,
+                 request: Any,
+                 *,
+                 timeout: Optional[float] = None,
+                 metadata: Optional[Metadata] = None,
+                 credentials: Optional[grpc.CallCredentials] = None,
+                 wait_for_ready: Optional[bool] = None,
+                 compression: Optional[grpc.Compression] = None
+                ) -> _base_call.UnaryStreamCall:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request: The request value for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.compression, e.g.
+            grpc.compression.Gzip. This is an EXPERIMENTAL option.
+
+        Returns:
+          A UnaryStreamCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class StreamUnaryMultiCallable(abc.ABC):
+    """Enables asynchronous invocation of a client-streaming RPC."""
+
+    @abc.abstractmethod
+    def __call__(self,
+                 request_iterator: Optional[RequestIterableType] = None,
+                 timeout: Optional[float] = None,
+                 metadata: Optional[Metadata] = None,
+                 credentials: Optional[grpc.CallCredentials] = None,
+                 wait_for_ready: Optional[bool] = None,
+                 compression: Optional[grpc.Compression] = None
+                ) -> _base_call.StreamUnaryCall:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request_iterator: An optional async iterable or iterable of request
+            messages for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.compression, e.g.
+            grpc.compression.Gzip. This is an EXPERIMENTAL option.
+
+        Returns:
+          A StreamUnaryCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class StreamStreamMultiCallable(abc.ABC):
+    """Enables asynchronous invocation of a bidirectional-streaming RPC."""
+
+    @abc.abstractmethod
+    def __call__(self,
+                 request_iterator: Optional[RequestIterableType] = None,
+                 timeout: Optional[float] = None,
+                 metadata: Optional[Metadata] = None,
+                 credentials: Optional[grpc.CallCredentials] = None,
+                 wait_for_ready: Optional[bool] = None,
+                 compression: Optional[grpc.Compression] = None
+                ) -> _base_call.StreamStreamCall:
+        """Asynchronously invokes the underlying RPC.
+
+        Args:
+          request_iterator: An optional async iterable or iterable of request
+            messages for the RPC.
+          timeout: An optional duration of time in seconds to allow
+            for the RPC.
+          metadata: Optional :term:`metadata` to be transmitted to the
+            service-side of the RPC.
+          credentials: An optional CallCredentials for the RPC. Only valid for
+            secure Channel.
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable :term:`wait_for_ready` mechanism.
+          compression: An element of grpc.compression, e.g.
+            grpc.compression.Gzip. This is an EXPERIMENTAL option.
+
+        Returns:
+          A StreamStreamCall object.
+
+        Raises:
+          RpcError: Indicates that the RPC terminated with non-OK status. The
+            raised RpcError will also be a Call for the RPC affording the RPC's
+            metadata, status code, and details.
+        """
+
+
+class Channel(abc.ABC):
+    """Enables asynchronous RPC invocation as a client.
+
+    Channel objects implement the Asynchronous Context Manager (aka. async
+    with) type, although they are not supportted to be entered and exited
+    multiple times.
+    """
+
+    @abc.abstractmethod
+    async def __aenter__(self):
+        """Starts an asynchronous context manager.
+
+        Returns:
+          Channel the channel that was instantiated.
+        """
+
+    @abc.abstractmethod
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        """Finishes the asynchronous context manager by closing the channel.
+
+        Still active RPCs will be cancelled.
+        """
+
+    @abc.abstractmethod
+    async def close(self, grace: Optional[float] = None):
+        """Closes this Channel and releases all resources held by it.
+
+        This method immediately stops the channel from executing new RPCs in
+        all cases.
+
+        If a grace period is specified, this method wait until all active
+        RPCs are finshed, once the grace period is reached the ones that haven't
+        been terminated are cancelled. If a grace period is not specified
+        (by passing None for grace), all existing RPCs are cancelled immediately.
+
+        This method is idempotent.
+        """
+
+    @abc.abstractmethod
+    def get_state(self,
+                  try_to_connect: bool = False) -> grpc.ChannelConnectivity:
+        """Checks the connectivity state of a channel.
+
+        This is an EXPERIMENTAL API.
+
+        If the channel reaches a stable connectivity state, it is guaranteed
+        that the return value of this function will eventually converge to that
+        state.
+
+        Args:
+          try_to_connect: a bool indicate whether the Channel should try to
+            connect to peer or not.
+
+        Returns: A ChannelConnectivity object.
+        """
+
+    @abc.abstractmethod
+    async def wait_for_state_change(
+            self,
+            last_observed_state: grpc.ChannelConnectivity,
+    ) -> None:
+        """Waits for a change in connectivity state.
+
+        This is an EXPERIMENTAL API.
+
+        The function blocks until there is a change in the channel connectivity
+        state from the "last_observed_state". If the state is already
+        different, this function will return immediately.
+
+        There is an inherent race between the invocation of
+        "Channel.wait_for_state_change" and "Channel.get_state". The state can
+        change arbitrary many times during the race, so there is no way to
+        observe every state transition.
+
+        If there is a need to put a timeout for this function, please refer to
+        "asyncio.wait_for".
+
+        Args:
+          last_observed_state: A grpc.ChannelConnectivity object representing
+            the last known state.
+        """
+
+    @abc.abstractmethod
+    async def channel_ready(self) -> None:
+        """Creates a coroutine that blocks until the Channel is READY."""
+
+    @abc.abstractmethod
+    def unary_unary(
+            self,
+            method: str,
+            request_serializer: Optional[SerializingFunction] = None,
+            response_deserializer: Optional[DeserializingFunction] = None
+    ) -> UnaryUnaryMultiCallable:
+        """Creates a UnaryUnaryMultiCallable for a unary-unary method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+
+        Returns:
+          A UnaryUnaryMultiCallable value for the named unary-unary method.
+        """
+
+    @abc.abstractmethod
+    def unary_stream(
+            self,
+            method: str,
+            request_serializer: Optional[SerializingFunction] = None,
+            response_deserializer: Optional[DeserializingFunction] = None
+    ) -> UnaryStreamMultiCallable:
+        """Creates a UnaryStreamMultiCallable for a unary-stream method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+
+        Returns:
+          A UnarySteramMultiCallable value for the named unary-stream method.
+        """
+
+    @abc.abstractmethod
+    def stream_unary(
+            self,
+            method: str,
+            request_serializer: Optional[SerializingFunction] = None,
+            response_deserializer: Optional[DeserializingFunction] = None
+    ) -> StreamUnaryMultiCallable:
+        """Creates a StreamUnaryMultiCallable for a stream-unary method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+
+        Returns:
+          A StreamUnaryMultiCallable value for the named stream-unary method.
+        """
+
+    @abc.abstractmethod
+    def stream_stream(
+            self,
+            method: str,
+            request_serializer: Optional[SerializingFunction] = None,
+            response_deserializer: Optional[DeserializingFunction] = None
+    ) -> StreamStreamMultiCallable:
+        """Creates a StreamStreamMultiCallable for a stream-stream method.
+
+        Args:
+          method: The name of the RPC method.
+          request_serializer: Optional :term:`serializer` for serializing the request
+            message. Request goes unserialized in case None is passed.
+          response_deserializer: Optional :term:`deserializer` for deserializing the
+            response message. Response goes undeserialized in case None
+            is passed.
+
+        Returns:
+          A StreamStreamMultiCallable value for the named stream-stream method.
+        """