| # |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You 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. |
| # |
| |
| """Client Interceptor to inject worker_id""" |
| # pytype: skip-file |
| |
| import collections |
| import os |
| from typing import Optional |
| |
| import grpc |
| |
| |
| class _ClientCallDetails(collections.namedtuple( |
| '_ClientCallDetails', ('method', 'timeout', 'metadata', 'credentials')), |
| grpc.ClientCallDetails): |
| pass |
| |
| |
| class WorkerIdInterceptor(grpc.UnaryUnaryClientInterceptor, |
| grpc.StreamStreamClientInterceptor): |
| |
| # TODO: (BEAM-3904) Removed defaulting to UUID when worker_id is not present |
| # and throw exception in worker_id_interceptor.py after we have rolled out |
| # the corresponding container changes. |
| # Unique worker Id for this worker. |
| _worker_id = os.environ.get('WORKER_ID') |
| |
| def __init__(self, worker_id=None): |
| # type: (Optional[str]) -> None |
| if worker_id: |
| self._worker_id = worker_id |
| |
| def intercept_unary_unary(self, continuation, client_call_details, request): |
| return self._intercept(continuation, client_call_details, request) |
| |
| def intercept_unary_stream(self, continuation, client_call_details, request): |
| return self._intercept(continuation, client_call_details, request) |
| |
| def intercept_stream_unary(self, continuation, client_call_details, request): |
| return self._intercept(continuation, client_call_details, request) |
| |
| def intercept_stream_stream( |
| self, continuation, client_call_details, request_iterator): |
| return self._intercept(continuation, client_call_details, request_iterator) |
| |
| def _intercept(self, continuation, client_call_details, request): |
| metadata = [] |
| if client_call_details.metadata is not None: |
| metadata = list(client_call_details.metadata) |
| if 'worker_id' in metadata: |
| raise RuntimeError('Header metadata already has a worker_id.') |
| metadata.append(('worker_id', self._worker_id)) |
| new_client_details = _ClientCallDetails( |
| client_call_details.method, |
| client_call_details.timeout, |
| metadata, |
| client_call_details.credentials) |
| return continuation(new_client_details, request) |