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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.worker;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ActionInput;
import java.io.IOException;
import java.nio.charset.Charset;
/**
* Calculates the hash based on the files, which should be unchanged on disk for a worker to get
* reused.
*/
public class WorkerFilesHash {
public static HashCode getWorkerFilesHash(
Iterable<? extends ActionInput> toolFiles, ActionExecutionContext actionExecutionContext)
throws IOException {
Hasher hasher = Hashing.sha256().newHasher();
for (ActionInput tool : toolFiles) {
hasher.putString(tool.getExecPathString(), Charset.defaultCharset());
hasher.putBytes(
actionExecutionContext.getActionInputFileCache().getMetadata(tool).getDigest());
}
return hasher.hash();
}
}
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