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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 static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import com.google.devtools.build.lib.actions.ActionInput;
import com.google.devtools.build.lib.actions.ActionInputFileCache;
import com.google.devtools.build.lib.actions.cache.VirtualActionInput;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.remoteexecution.v1test.Action;
import com.google.devtools.remoteexecution.v1test.Digest;
import com.google.protobuf.Message;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/** Helper methods relating to computing Digest messages for remote execution. */
@ThreadSafe
public final class Digests {
private Digests() {}
public static Digest computeDigest(byte[] blob) {
return buildDigest(Hashing.sha1().hashBytes(blob).toString(), blob.length);
}
public static Digest computeDigest(Path file) throws IOException {
return buildDigest(file.getSHA1Digest(), file.getFileSize());
}
public static Digest computeDigest(VirtualActionInput input) throws IOException {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
input.writeTo(buffer);
return computeDigest(buffer.toByteArray());
}
/**
* Computes a digest of the given proto message. Currently, we simply rely on message output as
* bytes, but this implementation relies on the stability of the proto encoding, in particular
* between different platforms and languages. TODO(olaola): upgrade to a better implementation!
*/
public static Digest computeDigest(Message message) {
return computeDigest(message.toByteArray());
}
public static Digest computeDigestUtf8(String str) {
return computeDigest(str.getBytes(UTF_8));
}
/**
* A special type of Digest that is used only as a remote action cache key. This is a
* separate type in order to prevent accidentally using other Digests as action keys.
*/
public static final class ActionKey {
private final Digest digest;
public Digest getDigest() {
return digest;
}
private ActionKey(Digest digest) {
this.digest = digest;
}
}
public static ActionKey computeActionKey(Action action) {
return new ActionKey(computeDigest(action));
}
/**
* Assumes that the given Digest is a valid digest of an Action, and creates an ActionKey
* wrapper. This should not be called on the client side!
*/
public static ActionKey unsafeActionKeyFromDigest(Digest digest) {
return new ActionKey(digest);
}
public static Digest buildDigest(byte[] hash, long size) {
return buildDigest(HashCode.fromBytes(hash).toString(), size);
}
public static Digest buildDigest(String hexHash, long size) {
return Digest.newBuilder().setHash(hexHash).setSizeBytes(size).build();
}
public static Digest getDigestFromInputCache(ActionInput input, ActionInputFileCache cache)
throws IOException {
return buildDigest(cache.getDigest(input), cache.getSizeInBytes(input));
}
}
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