122 lines
4.2 KiB
Python
122 lines
4.2 KiB
Python
# Copyright 2015 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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import collections
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import logging
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import threading
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from typing import Callable, Optional, Type
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import grpc
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from grpc import _common
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from grpc._cython import cygrpc
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from grpc._typing import MetadataType
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_LOGGER = logging.getLogger(__name__)
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class _AuthMetadataContext(
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collections.namedtuple('AuthMetadataContext', (
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'service_url',
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'method_name',
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)), grpc.AuthMetadataContext):
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pass
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class _CallbackState(object):
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def __init__(self):
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self.lock = threading.Lock()
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self.called = False
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self.exception = None
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class _AuthMetadataPluginCallback(grpc.AuthMetadataPluginCallback):
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_state: _CallbackState
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_callback: Callable
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def __init__(self, state: _CallbackState, callback: Callable):
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self._state = state
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self._callback = callback
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def __call__(self, metadata: MetadataType,
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error: Optional[Type[BaseException]]):
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with self._state.lock:
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if self._state.exception is None:
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if self._state.called:
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raise RuntimeError(
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'AuthMetadataPluginCallback invoked more than once!')
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else:
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self._state.called = True
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else:
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raise RuntimeError(
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'AuthMetadataPluginCallback raised exception "{}"!'.format(
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self._state.exception))
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if error is None:
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self._callback(metadata, cygrpc.StatusCode.ok, None)
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else:
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self._callback(None, cygrpc.StatusCode.internal,
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_common.encode(str(error)))
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class _Plugin(object):
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_metadata_plugin: grpc.AuthMetadataPlugin
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def __init__(self, metadata_plugin: grpc.AuthMetadataPlugin):
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self._metadata_plugin = metadata_plugin
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self._stored_ctx = None
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try:
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import contextvars # pylint: disable=wrong-import-position
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# The plugin may be invoked on a thread created by Core, which will not
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# have the context propagated. This context is stored and installed in
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# the thread invoking the plugin.
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self._stored_ctx = contextvars.copy_context()
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except ImportError:
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# Support versions predating contextvars.
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pass
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def __call__(self, service_url: str, method_name: str, callback: Callable):
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context = _AuthMetadataContext(_common.decode(service_url),
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_common.decode(method_name))
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callback_state = _CallbackState()
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try:
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self._metadata_plugin(
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context, _AuthMetadataPluginCallback(callback_state, callback))
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except Exception as exception: # pylint: disable=broad-except
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_LOGGER.exception(
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'AuthMetadataPluginCallback "%s" raised exception!',
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self._metadata_plugin)
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with callback_state.lock:
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callback_state.exception = exception
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if callback_state.called:
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return
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callback(None, cygrpc.StatusCode.internal,
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_common.encode(str(exception)))
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def metadata_plugin_call_credentials(
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metadata_plugin: grpc.AuthMetadataPlugin,
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name: Optional[str]) -> grpc.CallCredentials:
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if name is None:
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try:
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effective_name = metadata_plugin.__name__
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except AttributeError:
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effective_name = metadata_plugin.__class__.__name__
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else:
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effective_name = name
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return grpc.CallCredentials(
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cygrpc.MetadataPluginCallCredentials(_Plugin(metadata_plugin),
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_common.encode(effective_name)))
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