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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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100 lines
3.4 KiB
100 lines
3.4 KiB
# Copyright 2020 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 AsyncIO example of customizing authentication mechanism.""" |
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import argparse |
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import asyncio |
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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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_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: grpc.AuthMetadataContext, |
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callback: grpc.AuthMetadataPluginCallback) -> None: |
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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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callback(((_SIGNATURE_HEADER_KEY, signature),), None) |
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def create_client_channel(addr: str) -> grpc.aio.Channel: |
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# Call credential object will be invoked for every single RPC |
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call_credentials = grpc.metadata_call_credentials(AuthGateway(), |
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name='auth gateway') |
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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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# 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.aio.secure_channel(addr, composite_credentials) |
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return channel |
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async def send_rpc(channel: grpc.aio.Channel) -> helloworld_pb2.HelloReply: |
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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 = await 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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async def main() -> None: |
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parser = argparse.ArgumentParser() |
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parser.add_argument('--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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args = parser.parse_args() |
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channel = create_client_channel(_SERVER_ADDR_TEMPLATE % args.port) |
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await send_rpc(channel) |
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await channel.close() |
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if __name__ == '__main__': |
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logging.basicConfig(level=logging.INFO) |
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asyncio.run(main())
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