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/*
* Copyright 2023 Google LLC
*
* 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.cloud.storage;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;
import com.google.api.core.BetaApi;
import com.google.api.core.InternalApi;
import com.google.api.core.SettableApiFuture;
import com.google.cloud.storage.RecoveryFileManager.RecoveryVolumeSinkFactory;
import com.google.cloud.storage.Storage.BlobWriteOption;
import com.google.cloud.storage.TransportCompatibility.Transport;
import com.google.cloud.storage.UnifiedOpts.ObjectTargetOpt;
import com.google.cloud.storage.UnifiedOpts.Opts;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.MoreExecutors;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Clock;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.stream.Collector;
import javax.annotation.concurrent.Immutable;
import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
/**
* There are scenarios in which disk space is more plentiful than memory space. This new {@link
* BlobWriteSessionConfig} allows augmenting an instance of storage to produce {@link
* BlobWriteSession}s which will buffer to disk rather than holding things in memory.
*
* Once the file on disk is closed, the entire file will then be uploaded to GCS.
*
* @see Storage#blobWriteSession(BlobInfo, BlobWriteOption...)
* @see GrpcStorageOptions.Builder#setBlobWriteSessionConfig(BlobWriteSessionConfig)
* @see BlobWriteSessionConfigs#bufferToDiskThenUpload(Path)
* @see BlobWriteSessionConfigs#bufferToDiskThenUpload(Collection)
*/
@Immutable
@BetaApi
@TransportCompatibility({Transport.GRPC})
public final class BufferToDiskThenUpload extends BlobWriteSessionConfig
implements BlobWriteSessionConfig.GrpcCompatible {
private static final long serialVersionUID = 9059242302276891867L;
/**
* non-final because of {@link java.io.Serializable}, however this field is effectively final as
* it is immutable and there is not reference mutator method.
*/
@MonotonicNonNull private transient ImmutableList paths;
private final boolean includeLoggingSink;
/** Used for {@link java.io.Serializable} */
@MonotonicNonNull private volatile ArrayList absolutePaths;
@InternalApi
BufferToDiskThenUpload(ImmutableList paths, boolean includeLoggingSink) throws IOException {
this.paths = paths;
this.includeLoggingSink = includeLoggingSink;
}
@VisibleForTesting
@InternalApi
BufferToDiskThenUpload withIncludeLoggingSink() throws IOException {
return new BufferToDiskThenUpload(paths, true);
}
@InternalApi
@Override
WriterFactory createFactory(Clock clock) throws IOException {
Duration window = Duration.ofMinutes(10);
RecoveryFileManager recoveryFileManager =
RecoveryFileManager.of(paths, getRecoverVolumeSinkFactory(clock, window));
ThroughputSink gcs = ThroughputSink.windowed(ThroughputMovingWindow.of(window), clock);
gcs = includeLoggingSink ? ThroughputSink.tee(ThroughputSink.logged("gcs", clock), gcs) : gcs;
return new Factory(recoveryFileManager, clock, gcs);
}
private RecoveryVolumeSinkFactory getRecoverVolumeSinkFactory(Clock clock, Duration window) {
return path -> {
ThroughputSink windowed = ThroughputSink.windowed(ThroughputMovingWindow.of(window), clock);
if (includeLoggingSink) {
return ThroughputSink.tee(
ThroughputSink.logged(path.toAbsolutePath().toString(), clock), windowed);
} else {
return windowed;
}
};
}
private void writeObject(ObjectOutputStream out) throws IOException {
if (absolutePaths == null) {
synchronized (this) {
if (absolutePaths == null) {
absolutePaths =
paths.stream()
.map(Path::toAbsolutePath)
.map(Path::toString)
.collect(
Collector.of(
ArrayList::new,
ArrayList::add,
(left, right) -> {
left.addAll(right);
return left;
}));
}
}
}
out.defaultWriteObject();
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
this.paths = absolutePaths.stream().map(Paths::get).collect(ImmutableList.toImmutableList());
}
private static final class Factory implements WriterFactory {
private final RecoveryFileManager recoveryFileManager;
private final Clock clock;
private final ThroughputSink gcs;
private Factory(RecoveryFileManager recoveryFileManager, Clock clock, ThroughputSink gcs) {
this.recoveryFileManager = recoveryFileManager;
this.clock = clock;
this.gcs = gcs;
}
@InternalApi
@Override
public WritableByteChannelSession writeSession(
StorageInternal storage, BlobInfo info, Opts opts) {
return new Factory.WriteToFileThenUpload(
storage, info, opts, recoveryFileManager.newRecoveryFile(info));
}
private final class WriteToFileThenUpload
implements WritableByteChannelSession {
private final StorageInternal storage;
private final BlobInfo info;
private final Opts opts;
private final RecoveryFile rf;
private final SettableApiFuture result;
private WriteToFileThenUpload(
StorageInternal storage, BlobInfo info, Opts opts, RecoveryFile rf) {
this.info = info;
this.opts = opts;
this.rf = rf;
this.storage = storage;
this.result = SettableApiFuture.create();
}
@Override
public ApiFuture openAsync() {
try {
ApiFuture f = ApiFutures.immediateFuture(rf.writer());
return ApiFutures.transform(
f, Factory.WriteToFileThenUpload.Flusher::new, MoreExecutors.directExecutor());
} catch (IOException e) {
throw StorageException.coalesce(e);
}
}
@Override
public ApiFuture getResult() {
return result;
}
private final class Flusher implements WritableByteChannel {
private final WritableByteChannel delegate;
private Flusher(WritableByteChannel delegate) {
this.delegate = delegate;
}
@Override
public int write(ByteBuffer src) throws IOException {
return delegate.write(src);
}
@Override
public boolean isOpen() {
return delegate.isOpen();
}
@Override
public void close() throws IOException {
delegate.close();
try (RecoveryFile rf = Factory.WriteToFileThenUpload.this.rf) {
Path path = rf.getPath();
long size = Files.size(path);
ThroughputSink.computeThroughput(
clock,
gcs,
size,
() -> {
BlobInfo blob = storage.internalCreateFrom(path, info, opts);
result.set(blob);
});
} catch (StorageException | IOException e) {
result.setException(e);
throw e;
}
}
}
}
}
}