| /* |
| * 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. |
| */ |
| package org.apache.beam.runners.fnexecution.logging; |
| |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import org.apache.beam.model.fnexecution.v1.BeamFnApi; |
| import org.apache.beam.model.fnexecution.v1.BeamFnApi.LogControl; |
| import org.apache.beam.model.fnexecution.v1.BeamFnLoggingGrpc; |
| import org.apache.beam.runners.fnexecution.FnService; |
| import org.apache.beam.vendor.grpc.v1p13p1.io.grpc.stub.StreamObserver; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableSet; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** An implementation of the Beam Fn Logging Service over gRPC. */ |
| public class GrpcLoggingService extends BeamFnLoggingGrpc.BeamFnLoggingImplBase |
| implements FnService { |
| private static final Logger LOGGER = LoggerFactory.getLogger(GrpcLoggingService.class); |
| |
| public static GrpcLoggingService forWriter(LogWriter writer) { |
| return new GrpcLoggingService(writer); |
| } |
| |
| private final LogWriter logWriter; |
| private final ConcurrentMap<InboundObserver, StreamObserver<LogControl>> connectedClients; |
| |
| private GrpcLoggingService(LogWriter logWriter) { |
| this.logWriter = logWriter; |
| connectedClients = new ConcurrentHashMap<>(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| Set<InboundObserver> remainingClients = ImmutableSet.copyOf(connectedClients.keySet()); |
| if (!remainingClients.isEmpty()) { |
| LOGGER.info( |
| "{} Beam Fn Logging clients still connected during shutdown.", remainingClients.size()); |
| |
| // Signal server shutting down to all remaining connected clients. |
| for (InboundObserver client : remainingClients) { |
| // We remove these from the connected clients map to prevent a race between |
| // this close method and the InboundObserver calling a terminal method on the |
| // StreamObserver. If we removed it, then we are responsible for the terminal call. |
| completeIfNotNull(connectedClients.remove(client)); |
| } |
| } |
| } |
| |
| @Override |
| public StreamObserver<BeamFnApi.LogEntry.List> logging( |
| StreamObserver<BeamFnApi.LogControl> outboundObserver) { |
| LOGGER.info("Beam Fn Logging client connected."); |
| InboundObserver inboundObserver = new InboundObserver(); |
| connectedClients.put(inboundObserver, outboundObserver); |
| return inboundObserver; |
| } |
| |
| private void completeIfNotNull(StreamObserver<BeamFnApi.LogControl> outboundObserver) { |
| if (outboundObserver != null) { |
| try { |
| outboundObserver.onCompleted(); |
| } catch (RuntimeException ignored) { |
| // Completing outbound observer failed, ignoring failure and continuing |
| LOGGER.warn("Beam Fn Logging client failed to be complete.", ignored); |
| } |
| } |
| } |
| |
| /** |
| * An inbound {@link StreamObserver} that forwards incoming messages to the client logger. |
| * |
| * <p>Mutually hangs up on clients that have errored or completed. |
| */ |
| private class InboundObserver implements StreamObserver<BeamFnApi.LogEntry.List> { |
| @Override |
| public void onNext(BeamFnApi.LogEntry.List value) { |
| for (BeamFnApi.LogEntry logEntry : value.getLogEntriesList()) { |
| logWriter.log(logEntry); |
| } |
| } |
| |
| @Override |
| public void onError(Throwable t) { |
| LOGGER.warn("Logging client failed unexpectedly.", t); |
| // We remove these from the connected clients map to prevent a race between |
| // the close method and this InboundObserver calling a terminal method on the |
| // StreamObserver. If we removed it, then we are responsible for the terminal call. |
| completeIfNotNull(connectedClients.remove(this)); |
| } |
| |
| @Override |
| public void onCompleted() { |
| LOGGER.info("Logging client hanged up."); |
| // We remove these from the connected clients map to prevent a race between |
| // the close method and this InboundObserver calling a terminal method on the |
| // StreamObserver. If we removed it, then we are responsible for the terminal call. |
| completeIfNotNull(connectedClients.remove(this)); |
| } |
| } |
| } |