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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed 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 com.google.devtools.build.remote;
import com.google.common.base.Throwables;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.devtools.remoteexecution.v1test.ActionResult;
import com.google.devtools.remoteexecution.v1test.ExecuteResponse;
import com.google.longrunning.Operation;
import com.google.protobuf.Any;
import com.google.rpc.Code;
import com.google.rpc.Status;
import com.google.watcher.v1.Change;
import com.google.watcher.v1.ChangeBatch;
import com.google.watcher.v1.Request;
import com.google.watcher.v1.WatcherGrpc.WatcherImplBase;
import io.grpc.protobuf.StatusProto;
import io.grpc.stub.StreamObserver;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
/** A basic implementation of an {@link WatcherImplBase} service. */
final class WatcherServer extends WatcherImplBase {
private static final Logger logger = Logger.getLogger(WatcherServer.class.getName());
private final ConcurrentHashMap<String, ListenableFuture<ActionResult>> operationsCache;
public WatcherServer(ConcurrentHashMap<String, ListenableFuture<ActionResult>> operationsCache) {
this.operationsCache = operationsCache;
}
@Override
public void watch(Request wr, StreamObserver<ChangeBatch> responseObserver) {
final String opName = wr.getTarget();
ListenableFuture<ActionResult> future = operationsCache.get(opName);
if (future == null) {
responseObserver.onError(
StatusProto.toStatusRuntimeException(
Status.newBuilder()
.setCode(Code.NOT_FOUND.getNumber())
.setMessage("Operation not found: " + opName)
.build()));
return;
}
future.addListener(() -> {
try {
try {
ActionResult result = future.get();
responseObserver.onNext(
packExists(
Operation.newBuilder()
.setName(opName)
.setDone(true)
.setResponse(
Any.pack(ExecuteResponse.newBuilder().setResult(result).build()))));
responseObserver.onCompleted();
} catch (ExecutionException e) {
Throwables.throwIfUnchecked(e.getCause());
throw (Exception) e.getCause();
}
} catch (Exception e) {
logger.log(Level.SEVERE, "Work failed: " + opName, e);
responseObserver.onNext(
ChangeBatch.newBuilder()
.addChanges(
Change.newBuilder()
.setState(Change.State.EXISTS)
.setData(
Any.pack(
Operation.newBuilder()
.setName(opName)
.setError(StatusUtils.internalErrorStatus(e))
.build()))
.build())
.build());
responseObserver.onCompleted();
if (e instanceof InterruptedException) {
Thread.currentThread().interrupt();
}
} finally {
operationsCache.remove(opName);
}
}, MoreExecutors.directExecutor());
}
/** Constructs a ChangeBatch with an exists state change that contains the given operation. */
private ChangeBatch packExists(Operation.Builder message) {
return ChangeBatch.newBuilder()
.addChanges(
Change.newBuilder()
.setState(Change.State.EXISTS)
.setData(
Any.pack(message.build())))
.build();
}
}
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