639 lines
25 KiB
Python
639 lines
25 KiB
Python
# Copyright 2017 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Implementation of gRPC Python interceptors."""
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import collections
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import sys
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import types
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from typing import Any, Callable, Optional, Sequence, Tuple, Union
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import grpc
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from ._typing import DeserializingFunction
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from ._typing import DoneCallbackType
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from ._typing import MetadataType
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from ._typing import RequestIterableType
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from ._typing import SerializingFunction
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class _ServicePipeline(object):
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interceptors: Tuple[grpc.ServerInterceptor]
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def __init__(self, interceptors: Sequence[grpc.ServerInterceptor]):
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self.interceptors = tuple(interceptors)
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def _continuation(self, thunk: Callable, index: int) -> Callable:
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return lambda context: self._intercept_at(thunk, index, context)
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def _intercept_at(
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self, thunk: Callable, index: int,
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context: grpc.HandlerCallDetails) -> grpc.RpcMethodHandler:
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if index < len(self.interceptors):
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interceptor = self.interceptors[index]
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thunk = self._continuation(thunk, index + 1)
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return interceptor.intercept_service(thunk, context)
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else:
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return thunk(context)
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def execute(self, thunk: Callable,
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context: grpc.HandlerCallDetails) -> grpc.RpcMethodHandler:
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return self._intercept_at(thunk, 0, context)
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def service_pipeline(
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interceptors: Optional[Sequence[grpc.ServerInterceptor]]
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) -> Optional[_ServicePipeline]:
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return _ServicePipeline(interceptors) if interceptors else None
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class _ClientCallDetails(
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collections.namedtuple('_ClientCallDetails',
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('method', 'timeout', 'metadata', 'credentials',
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'wait_for_ready', 'compression')),
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grpc.ClientCallDetails):
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pass
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def _unwrap_client_call_details(
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call_details: grpc.ClientCallDetails,
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default_details: grpc.ClientCallDetails
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) -> Tuple[str, float, MetadataType, grpc.CallCredentials, bool,
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grpc.Compression]:
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try:
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method = call_details.method # pytype: disable=attribute-error
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except AttributeError:
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method = default_details.method # pytype: disable=attribute-error
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try:
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timeout = call_details.timeout # pytype: disable=attribute-error
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except AttributeError:
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timeout = default_details.timeout # pytype: disable=attribute-error
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try:
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metadata = call_details.metadata # pytype: disable=attribute-error
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except AttributeError:
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metadata = default_details.metadata # pytype: disable=attribute-error
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try:
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credentials = call_details.credentials # pytype: disable=attribute-error
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except AttributeError:
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credentials = default_details.credentials # pytype: disable=attribute-error
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try:
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wait_for_ready = call_details.wait_for_ready # pytype: disable=attribute-error
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except AttributeError:
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wait_for_ready = default_details.wait_for_ready # pytype: disable=attribute-error
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try:
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compression = call_details.compression # pytype: disable=attribute-error
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except AttributeError:
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compression = default_details.compression # pytype: disable=attribute-error
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return method, timeout, metadata, credentials, wait_for_ready, compression
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class _FailureOutcome(grpc.RpcError, grpc.Future, grpc.Call): # pylint: disable=too-many-ancestors
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_exception: Exception
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_traceback: types.TracebackType
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def __init__(self, exception: Exception, traceback: types.TracebackType):
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super(_FailureOutcome, self).__init__()
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self._exception = exception
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self._traceback = traceback
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def initial_metadata(self) -> Optional[MetadataType]:
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return None
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def trailing_metadata(self) -> Optional[MetadataType]:
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return None
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def code(self) -> Optional[grpc.StatusCode]:
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return grpc.StatusCode.INTERNAL
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def details(self) -> Optional[str]:
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return 'Exception raised while intercepting the RPC'
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def cancel(self) -> bool:
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return False
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def cancelled(self) -> bool:
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return False
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def is_active(self) -> bool:
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return False
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def time_remaining(self) -> Optional[float]:
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return None
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def running(self) -> bool:
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return False
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def done(self) -> bool:
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return True
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def result(self, ignored_timeout: Optional[float] = None):
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raise self._exception
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def exception(
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self,
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ignored_timeout: Optional[float] = None) -> Optional[Exception]:
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return self._exception
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def traceback(
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self,
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ignored_timeout: Optional[float] = None
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) -> Optional[types.TracebackType]:
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return self._traceback
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def add_callback(self, unused_callback) -> bool:
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return False
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def add_done_callback(self, fn: DoneCallbackType) -> None:
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fn(self)
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def __iter__(self):
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return self
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def __next__(self):
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raise self._exception
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def next(self):
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return self.__next__()
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class _UnaryOutcome(grpc.Call, grpc.Future):
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_response: Any
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_call: grpc.Call
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def __init__(self, response: Any, call: grpc.Call):
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self._response = response
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self._call = call
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def initial_metadata(self) -> Optional[MetadataType]:
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return self._call.initial_metadata()
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def trailing_metadata(self) -> Optional[MetadataType]:
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return self._call.trailing_metadata()
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def code(self) -> Optional[grpc.StatusCode]:
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return self._call.code()
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def details(self) -> Optional[str]:
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return self._call.details()
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def is_active(self) -> bool:
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return self._call.is_active()
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def time_remaining(self) -> Optional[float]:
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return self._call.time_remaining()
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def cancel(self) -> bool:
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return self._call.cancel()
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def add_callback(self, callback) -> bool:
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return self._call.add_callback(callback)
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def cancelled(self) -> bool:
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return False
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def running(self) -> bool:
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return False
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def done(self) -> bool:
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return True
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def result(self, ignored_timeout: Optional[float] = None):
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return self._response
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def exception(self, ignored_timeout: Optional[float] = None):
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return None
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def traceback(self, ignored_timeout: Optional[float] = None):
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return None
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def add_done_callback(self, fn: DoneCallbackType) -> None:
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fn(self)
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class _UnaryUnaryMultiCallable(grpc.UnaryUnaryMultiCallable):
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_thunk: Callable
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_method: str
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_interceptor: grpc.UnaryUnaryClientInterceptor
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def __init__(self, thunk: Callable, method: str,
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interceptor: grpc.UnaryUnaryClientInterceptor):
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self._thunk = thunk
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self._method = method
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self._interceptor = interceptor
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def __call__(self,
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request: Any,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None) -> Any:
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response, ignored_call = self._with_call(request,
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timeout=timeout,
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metadata=metadata,
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credentials=credentials,
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wait_for_ready=wait_for_ready,
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compression=compression)
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return response
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def _with_call(
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self,
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request: Any,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None
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) -> Tuple[Any, grpc.Call]:
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client_call_details = _ClientCallDetails(self._method, timeout,
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metadata, credentials,
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wait_for_ready, compression)
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def continuation(new_details, request):
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(new_method, new_timeout, new_metadata, new_credentials,
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new_wait_for_ready,
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new_compression) = (_unwrap_client_call_details(
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new_details, client_call_details))
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try:
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response, call = self._thunk(new_method).with_call(
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request,
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timeout=new_timeout,
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metadata=new_metadata,
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credentials=new_credentials,
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wait_for_ready=new_wait_for_ready,
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compression=new_compression)
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return _UnaryOutcome(response, call)
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except grpc.RpcError as rpc_error:
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return rpc_error
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except Exception as exception: # pylint:disable=broad-except
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return _FailureOutcome(exception, sys.exc_info()[2])
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call = self._interceptor.intercept_unary_unary(continuation,
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client_call_details,
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request)
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return call.result(), call
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def with_call(
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self,
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request: Any,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None
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) -> Tuple[Any, grpc.Call]:
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return self._with_call(request,
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timeout=timeout,
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metadata=metadata,
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credentials=credentials,
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wait_for_ready=wait_for_ready,
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compression=compression)
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def future(self,
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request: Any,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None) -> Any:
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client_call_details = _ClientCallDetails(self._method, timeout,
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metadata, credentials,
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wait_for_ready, compression)
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def continuation(new_details, request):
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(new_method, new_timeout, new_metadata, new_credentials,
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new_wait_for_ready,
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new_compression) = (_unwrap_client_call_details(
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new_details, client_call_details))
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return self._thunk(new_method).future(
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request,
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timeout=new_timeout,
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metadata=new_metadata,
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credentials=new_credentials,
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wait_for_ready=new_wait_for_ready,
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compression=new_compression)
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try:
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return self._interceptor.intercept_unary_unary(
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continuation, client_call_details, request)
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except Exception as exception: # pylint:disable=broad-except
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return _FailureOutcome(exception, sys.exc_info()[2])
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class _UnaryStreamMultiCallable(grpc.UnaryStreamMultiCallable):
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_thunk: Callable
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_method: str
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_interceptor: grpc.UnaryStreamClientInterceptor
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def __init__(self, thunk: Callable, method: str,
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interceptor: grpc.UnaryStreamClientInterceptor):
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self._thunk = thunk
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self._method = method
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self._interceptor = interceptor
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def __call__(self,
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request: Any,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None):
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client_call_details = _ClientCallDetails(self._method, timeout,
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metadata, credentials,
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wait_for_ready, compression)
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def continuation(new_details, request):
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(new_method, new_timeout, new_metadata, new_credentials,
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new_wait_for_ready,
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new_compression) = (_unwrap_client_call_details(
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new_details, client_call_details))
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return self._thunk(new_method)(request,
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timeout=new_timeout,
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metadata=new_metadata,
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credentials=new_credentials,
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wait_for_ready=new_wait_for_ready,
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compression=new_compression)
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try:
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return self._interceptor.intercept_unary_stream(
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continuation, client_call_details, request)
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except Exception as exception: # pylint:disable=broad-except
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return _FailureOutcome(exception, sys.exc_info()[2])
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class _StreamUnaryMultiCallable(grpc.StreamUnaryMultiCallable):
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_thunk: Callable
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_method: str
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_interceptor: grpc.StreamUnaryClientInterceptor
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def __init__(self, thunk: Callable, method: str,
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interceptor: grpc.StreamUnaryClientInterceptor):
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self._thunk = thunk
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self._method = method
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self._interceptor = interceptor
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def __call__(self,
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request_iterator: RequestIterableType,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None) -> Any:
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response, ignored_call = self._with_call(request_iterator,
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timeout=timeout,
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metadata=metadata,
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credentials=credentials,
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wait_for_ready=wait_for_ready,
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compression=compression)
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return response
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def _with_call(
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self,
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request_iterator: RequestIterableType,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None
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) -> Tuple[Any, grpc.Call]:
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client_call_details = _ClientCallDetails(self._method, timeout,
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metadata, credentials,
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wait_for_ready, compression)
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def continuation(new_details, request_iterator):
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(new_method, new_timeout, new_metadata, new_credentials,
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new_wait_for_ready,
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new_compression) = (_unwrap_client_call_details(
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new_details, client_call_details))
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try:
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response, call = self._thunk(new_method).with_call(
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request_iterator,
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timeout=new_timeout,
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metadata=new_metadata,
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credentials=new_credentials,
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wait_for_ready=new_wait_for_ready,
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compression=new_compression)
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return _UnaryOutcome(response, call)
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except grpc.RpcError as rpc_error:
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return rpc_error
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except Exception as exception: # pylint:disable=broad-except
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return _FailureOutcome(exception, sys.exc_info()[2])
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call = self._interceptor.intercept_stream_unary(continuation,
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client_call_details,
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request_iterator)
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return call.result(), call
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def with_call(
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self,
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request_iterator: RequestIterableType,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None
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) -> Tuple[Any, grpc.Call]:
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return self._with_call(request_iterator,
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timeout=timeout,
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metadata=metadata,
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credentials=credentials,
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wait_for_ready=wait_for_ready,
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compression=compression)
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def future(self,
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request_iterator: RequestIterableType,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None) -> Any:
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client_call_details = _ClientCallDetails(self._method, timeout,
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metadata, credentials,
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wait_for_ready, compression)
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def continuation(new_details, request_iterator):
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(new_method, new_timeout, new_metadata, new_credentials,
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new_wait_for_ready,
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new_compression) = (_unwrap_client_call_details(
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new_details, client_call_details))
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return self._thunk(new_method).future(
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request_iterator,
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timeout=new_timeout,
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metadata=new_metadata,
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credentials=new_credentials,
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wait_for_ready=new_wait_for_ready,
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compression=new_compression)
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try:
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return self._interceptor.intercept_stream_unary(
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continuation, client_call_details, request_iterator)
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except Exception as exception: # pylint:disable=broad-except
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return _FailureOutcome(exception, sys.exc_info()[2])
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class _StreamStreamMultiCallable(grpc.StreamStreamMultiCallable):
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_thunk: Callable
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_method: str
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_interceptor: grpc.StreamStreamClientInterceptor
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def __init__(self, thunk: Callable, method: str,
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interceptor: grpc.StreamStreamClientInterceptor):
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self._thunk = thunk
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self._method = method
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self._interceptor = interceptor
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def __call__(self,
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request_iterator: RequestIterableType,
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timeout: Optional[float] = None,
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metadata: Optional[MetadataType] = None,
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credentials: Optional[grpc.CallCredentials] = None,
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wait_for_ready: Optional[bool] = None,
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compression: Optional[grpc.Compression] = None):
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client_call_details = _ClientCallDetails(self._method, timeout,
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metadata, credentials,
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wait_for_ready, compression)
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def continuation(new_details, request_iterator):
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(new_method, new_timeout, new_metadata, new_credentials,
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new_wait_for_ready,
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new_compression) = (_unwrap_client_call_details(
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new_details, client_call_details))
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return self._thunk(new_method)(request_iterator,
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timeout=new_timeout,
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metadata=new_metadata,
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credentials=new_credentials,
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wait_for_ready=new_wait_for_ready,
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compression=new_compression)
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try:
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return self._interceptor.intercept_stream_stream(
|
|
continuation, client_call_details, request_iterator)
|
|
except Exception as exception: # pylint:disable=broad-except
|
|
return _FailureOutcome(exception, sys.exc_info()[2])
|
|
|
|
|
|
class _Channel(grpc.Channel):
|
|
_channel: grpc.Channel
|
|
_interceptor: Union[grpc.UnaryUnaryClientInterceptor,
|
|
grpc.UnaryStreamClientInterceptor,
|
|
grpc.StreamStreamClientInterceptor,
|
|
grpc.StreamUnaryClientInterceptor]
|
|
|
|
def __init__(self, channel: grpc.Channel,
|
|
interceptor: Union[grpc.UnaryUnaryClientInterceptor,
|
|
grpc.UnaryStreamClientInterceptor,
|
|
grpc.StreamStreamClientInterceptor,
|
|
grpc.StreamUnaryClientInterceptor]):
|
|
self._channel = channel
|
|
self._interceptor = interceptor
|
|
|
|
def subscribe(self,
|
|
callback: Callable,
|
|
try_to_connect: Optional[bool] = False):
|
|
self._channel.subscribe(callback, try_to_connect=try_to_connect)
|
|
|
|
def unsubscribe(self, callback: Callable):
|
|
self._channel.unsubscribe(callback)
|
|
|
|
def unary_unary(
|
|
self,
|
|
method: str,
|
|
request_serializer: Optional[SerializingFunction] = None,
|
|
response_deserializer: Optional[DeserializingFunction] = None
|
|
) -> grpc.UnaryUnaryMultiCallable:
|
|
thunk = lambda m: self._channel.unary_unary(m, request_serializer,
|
|
response_deserializer)
|
|
if isinstance(self._interceptor, grpc.UnaryUnaryClientInterceptor):
|
|
return _UnaryUnaryMultiCallable(thunk, method, self._interceptor)
|
|
else:
|
|
return thunk(method)
|
|
|
|
def unary_stream(
|
|
self,
|
|
method: str,
|
|
request_serializer: Optional[SerializingFunction] = None,
|
|
response_deserializer: Optional[DeserializingFunction] = None
|
|
) -> grpc.UnaryStreamMultiCallable:
|
|
thunk = lambda m: self._channel.unary_stream(m, request_serializer,
|
|
response_deserializer)
|
|
if isinstance(self._interceptor, grpc.UnaryStreamClientInterceptor):
|
|
return _UnaryStreamMultiCallable(thunk, method, self._interceptor)
|
|
else:
|
|
return thunk(method)
|
|
|
|
def stream_unary(
|
|
self,
|
|
method: str,
|
|
request_serializer: Optional[SerializingFunction] = None,
|
|
response_deserializer: Optional[DeserializingFunction] = None
|
|
) -> grpc.StreamUnaryMultiCallable:
|
|
thunk = lambda m: self._channel.stream_unary(m, request_serializer,
|
|
response_deserializer)
|
|
if isinstance(self._interceptor, grpc.StreamUnaryClientInterceptor):
|
|
return _StreamUnaryMultiCallable(thunk, method, self._interceptor)
|
|
else:
|
|
return thunk(method)
|
|
|
|
def stream_stream(
|
|
self,
|
|
method: str,
|
|
request_serializer: Optional[SerializingFunction] = None,
|
|
response_deserializer: Optional[DeserializingFunction] = None
|
|
) -> grpc.StreamStreamMultiCallable:
|
|
thunk = lambda m: self._channel.stream_stream(m, request_serializer,
|
|
response_deserializer)
|
|
if isinstance(self._interceptor, grpc.StreamStreamClientInterceptor):
|
|
return _StreamStreamMultiCallable(thunk, method, self._interceptor)
|
|
else:
|
|
return thunk(method)
|
|
|
|
def _close(self):
|
|
self._channel.close()
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
self._close()
|
|
return False
|
|
|
|
def close(self):
|
|
self._channel.close()
|
|
|
|
|
|
def intercept_channel(
|
|
channel: grpc.Channel,
|
|
*interceptors: Optional[Sequence[Union[grpc.UnaryUnaryClientInterceptor,
|
|
grpc.UnaryStreamClientInterceptor,
|
|
grpc.StreamStreamClientInterceptor,
|
|
grpc.StreamUnaryClientInterceptor]]]
|
|
) -> grpc.Channel:
|
|
for interceptor in reversed(list(interceptors)):
|
|
if not isinstance(interceptor, grpc.UnaryUnaryClientInterceptor) and \
|
|
not isinstance(interceptor, grpc.UnaryStreamClientInterceptor) and \
|
|
not isinstance(interceptor, grpc.StreamUnaryClientInterceptor) and \
|
|
not isinstance(interceptor, grpc.StreamStreamClientInterceptor):
|
|
raise TypeError('interceptor must be '
|
|
'grpc.UnaryUnaryClientInterceptor or '
|
|
'grpc.UnaryStreamClientInterceptor or '
|
|
'grpc.StreamUnaryClientInterceptor or '
|
|
'grpc.StreamStreamClientInterceptor or ')
|
|
channel = _Channel(channel, interceptor)
|
|
return channel
|