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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.base.Preconditions;
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.ActionInput;
import com.google.devtools.build.lib.actions.ActionInputHelper;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander;
import com.google.devtools.build.lib.actions.FileArtifactValue;
import com.google.devtools.build.lib.actions.MetadataProvider;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
/**
* Calculates the hash based on the files, which should be unchanged on disk for a worker to get
* reused.
*/
class WorkerFilesHash {
static HashCode getCombinedHash(SortedMap<PathFragment, HashCode> workerFilesMap) {
Hasher hasher = Hashing.sha256().newHasher();
for (Map.Entry<PathFragment, HashCode> workerFile : workerFilesMap.entrySet()) {
hasher.putString(workerFile.getKey().getPathString(), Charset.defaultCharset());
hasher.putBytes(workerFile.getValue().asBytes());
}
return hasher.hash();
}
/**
* Return a map that contains the execroot relative path and hash of each tool and runfiles
* artifact of the given spawn.
*/
static SortedMap<PathFragment, HashCode> getWorkerFilesWithHashes(
Spawn spawn, ArtifactExpander artifactExpander, MetadataProvider actionInputFileCache)
throws IOException {
TreeMap<PathFragment, HashCode> workerFilesMap = new TreeMap<>();
List<ActionInput> tools =
ActionInputHelper.expandArtifacts(spawn.getToolFiles(), artifactExpander);
for (ActionInput tool : tools) {
workerFilesMap.put(
tool.getExecPath(),
HashCode.fromBytes(actionInputFileCache.getMetadata(tool).getDigest()));
}
for (Map.Entry<PathFragment, Map<PathFragment, Artifact>> rootAndMappings :
spawn.getRunfilesSupplier().getMappings().entrySet()) {
PathFragment root = rootAndMappings.getKey();
Preconditions.checkState(!root.isAbsolute(), root);
for (Map.Entry<PathFragment, Artifact> mapping : rootAndMappings.getValue().entrySet()) {
Artifact localArtifact = mapping.getValue();
if (localArtifact != null) {
FileArtifactValue metadata = actionInputFileCache.getMetadata(localArtifact);
if (metadata.getType().isFile()) {
workerFilesMap.put(
root.getRelative(mapping.getKey()),
HashCode.fromBytes(metadata.getDigest()));
}
}
}
}
return workerFilesMap;
}
}
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