mirror of
https://github.com/php-win-ext/grpc.git
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de6ed9ba9f
- Switched from yapf to black - Reconfigure isort for black - Resolve black/pylint idiosyncrasies Note: I used `--experimental-string-processing` because black was producing "implicit string concatenation", similar to what described here: https://github.com/psf/black/issues/1837. While currently this feature is experimental, it will be enabled by default: https://github.com/psf/black/issues/2188. After running black with the new string processing so that the generated code merges these `"hello" " world"` strings concatenations, then I removed `--experimental-string-processing` for stability, and regenerated the code again. To the reviewer: don't even try to open "Files Changed" tab 😄 It's better to review commit-by-commit, and ignore `run black and isort`.
105 lines
3.2 KiB
Python
105 lines
3.2 KiB
Python
# Copyright 2019 The 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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"""Client of the Python example of customizing authentication mechanism."""
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import argparse
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import contextlib
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import logging
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import _credentials
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import grpc
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helloworld_pb2, helloworld_pb2_grpc = grpc.protos_and_services(
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"helloworld.proto"
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)
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_LOGGER = logging.getLogger(__name__)
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_LOGGER.setLevel(logging.INFO)
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_SERVER_ADDR_TEMPLATE = "localhost:%d"
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_SIGNATURE_HEADER_KEY = "x-signature"
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class AuthGateway(grpc.AuthMetadataPlugin):
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def __call__(self, context, callback):
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"""Implements authentication by passing metadata to a callback.
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Implementations of this method must not block.
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Args:
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context: An AuthMetadataContext providing information on the RPC that
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the plugin is being called to authenticate.
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callback: An AuthMetadataPluginCallback to be invoked either
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synchronously or asynchronously.
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"""
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# Example AuthMetadataContext object:
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# AuthMetadataContext(
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# service_url=u'https://localhost:50051/helloworld.Greeter',
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# method_name=u'SayHello')
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signature = context.method_name[::-1]
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# NOTE: The metadata keys provided to the callback must be lower-cased.
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callback(((_SIGNATURE_HEADER_KEY, signature),), None)
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@contextlib.contextmanager
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def create_client_channel(addr):
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# Call credential object will be invoked for every single RPC
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call_credentials = grpc.metadata_call_credentials(
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AuthGateway(), name="auth gateway"
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)
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# Channel credential will be valid for the entire channel
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channel_credential = grpc.ssl_channel_credentials(
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_credentials.ROOT_CERTIFICATE
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)
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# Combining channel credentials and call credentials together
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composite_credentials = grpc.composite_channel_credentials(
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channel_credential,
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call_credentials,
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)
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channel = grpc.secure_channel(addr, composite_credentials)
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yield channel
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def send_rpc(channel):
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stub = helloworld_pb2_grpc.GreeterStub(channel)
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request = helloworld_pb2.HelloRequest(name="you")
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try:
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response = stub.SayHello(request)
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except grpc.RpcError as rpc_error:
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_LOGGER.error("Received error: %s", rpc_error)
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return rpc_error
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else:
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_LOGGER.info("Received message: %s", response)
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return response
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"--port",
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nargs="?",
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type=int,
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default=50051,
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help="the address of server",
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)
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args = parser.parse_args()
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with create_client_channel(_SERVER_ADDR_TEMPLATE % args.port) as channel:
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send_rpc(channel)
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if __name__ == "__main__":
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logging.basicConfig(level=logging.INFO)
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main()
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