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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.lib.remote.blobstore;
import com.google.common.io.ByteStreams;
import com.google.devtools.build.lib.vfs.Path;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
/** A on-disk store for the remote action cache. */
public final class OnDiskBlobStore implements SimpleBlobStore {
private final Path root;
public OnDiskBlobStore(Path root) {
this.root = root;
}
@Override
public boolean containsKey(String key) {
return toPath(key).exists();
}
@Override
public boolean get(String key, OutputStream out) throws IOException {
Path f = toPath(key);
if (!f.exists()) {
return false;
}
try (InputStream in = f.getInputStream()) {
ByteStreams.copy(in, out);
}
return true;
}
@Override
public boolean getActionResult(String key, OutputStream out)
throws IOException, InterruptedException {
return get(key, out);
}
@Override
public void put(String key, long length, InputStream in) throws IOException {
Path target = toPath(key);
if (target.exists()) {
return;
}
// Write a temporary file first, and then rename, to avoid data corruption in case of a crash.
Path temp = toPath(UUID.randomUUID().toString());
try (OutputStream out = temp.getOutputStream()) {
ByteStreams.copy(in, out);
}
// TODO(ulfjack): Fsync temp here before we rename it to avoid data loss in the case of machine
// crashes (the OS may reorder the writes and the rename).
temp.renameTo(target);
}
@Override
public void putActionResult(String key, byte[] in) throws IOException, InterruptedException {
put(key, in.length, new ByteArrayInputStream(in));
}
@Override
public void close() {}
private Path toPath(String key) {
return root.getChild(key);
}
}
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