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// Copyright 2016 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.lib.remote;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.util.Preconditions;
import com.google.devtools.remoteexecution.v1test.ExecuteRequest;
import com.google.devtools.remoteexecution.v1test.ExecuteResponse;
import com.google.devtools.remoteexecution.v1test.ExecutionGrpc;
import com.google.devtools.remoteexecution.v1test.ExecutionGrpc.ExecutionBlockingStub;
import com.google.longrunning.Operation;
import com.google.protobuf.InvalidProtocolBufferException;
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;
import com.google.watcher.v1.WatcherGrpc.WatcherBlockingStub;
import io.grpc.Channel;
import io.grpc.Status.Code;
import io.grpc.StatusRuntimeException;
import io.grpc.protobuf.StatusProto;
import java.io.IOException;
import java.util.Iterator;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
/** A remote work executor that uses gRPC for communicating the work, inputs and outputs. */
@ThreadSafe
public class GrpcRemoteExecutor {
private final RemoteOptions options;
private final ChannelOptions channelOptions;
private final Channel channel;
private final Retrier retrier;
public static boolean isRemoteExecutionOptions(RemoteOptions options) {
return options.remoteExecutor != null;
}
public GrpcRemoteExecutor(Channel channel, ChannelOptions channelOptions, RemoteOptions options) {
this.options = options;
this.channelOptions = channelOptions;
this.channel = channel;
this.retrier = new Retrier(options);
}
private ExecutionBlockingStub execBlockingStub() {
return ExecutionGrpc.newBlockingStub(channel)
.withCallCredentials(channelOptions.getCallCredentials())
.withDeadlineAfter(options.remoteTimeout, TimeUnit.SECONDS);
}
private WatcherBlockingStub watcherBlockingStub() {
return WatcherGrpc.newBlockingStub(channel)
.withCallCredentials(channelOptions.getCallCredentials());
}
private @Nullable ExecuteResponse getOperationResponse(Operation op)
throws IOException {
if (op.getResultCase() == Operation.ResultCase.ERROR) {
StatusRuntimeException e = StatusProto.toStatusRuntimeException(op.getError());
if (e.getStatus().getCode() == Code.DEADLINE_EXCEEDED) {
// This was caused by the command itself exceeding the timeout,
// therefore it is not retriable.
// TODO(olaola): this should propagate a timeout SpawnResult instead of raising.
throw new IOException("Remote execution time out");
}
throw e;
}
if (op.getDone()) {
Preconditions.checkState(op.getResultCase() != Operation.ResultCase.RESULT_NOT_SET);
try {
return op.getResponse().unpack(ExecuteResponse.class);
} catch (InvalidProtocolBufferException e) {
throw new IOException(e);
}
}
return null;
}
public ExecuteResponse executeRemotely(ExecuteRequest request)
throws IOException, InterruptedException {
Operation op = retrier.execute(() -> execBlockingStub().execute(request));
ExecuteResponse resp = getOperationResponse(op);
if (resp != null) {
return resp;
}
Request wr = Request.newBuilder().setTarget(op.getName()).build();
return retrier.execute(
() -> {
Iterator<ChangeBatch> replies = watcherBlockingStub().watch(wr);
while (replies.hasNext()) {
ChangeBatch cb = replies.next();
for (Change ch : cb.getChangesList()) {
switch (ch.getState()) {
case INITIAL_STATE_SKIPPED:
continue;
case ERROR:
try {
throw StatusProto.toStatusRuntimeException(ch.getData().unpack(Status.class));
} catch (InvalidProtocolBufferException e) {
throw new RuntimeException(e);
}
case DOES_NOT_EXIST:
// TODO(olaola): either make this retriable, or use a different exception.
throw new IOException(
String.format("Operation %s lost on the remote server.", op.getName()));
case EXISTS:
Operation o;
try {
o = ch.getData().unpack(Operation.class);
} catch (InvalidProtocolBufferException e) {
throw new RuntimeException(e);
}
ExecuteResponse r = getOperationResponse(o);
if (r != null) {
return r;
}
continue;
default:
// This can only happen if the enum gets unexpectedly extended.
throw new IOException(String.format("Illegal change state: %s", ch.getState()));
}
}
}
throw new IOException(
String.format("Watch request for %s terminated with no result.", op.getName()));
});
}
}
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