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ByteStreamUploader.java
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ByteStreamUploader.java
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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;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.util.concurrent.Futures.immediateVoidFuture;
import static java.lang.String.format;
import static java.util.Collections.singletonMap;
import static java.util.concurrent.TimeUnit.SECONDS;
import build.bazel.remote.execution.v2.Digest;
import com.google.bytestream.ByteStreamGrpc;
import com.google.bytestream.ByteStreamGrpc.ByteStreamFutureStub;
import com.google.bytestream.ByteStreamProto.QueryWriteStatusRequest;
import com.google.bytestream.ByteStreamProto.QueryWriteStatusResponse;
import com.google.bytestream.ByteStreamProto.WriteRequest;
import com.google.bytestream.ByteStreamProto.WriteResponse;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Ascii;
import com.google.common.base.Strings;
import com.google.common.base.Throwables;
import com.google.common.flogger.GoogleLogger;
import com.google.common.hash.HashCode;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.SettableFuture;
import com.google.devtools.build.lib.authandtls.CallCredentialsProvider;
import com.google.devtools.build.lib.remote.RemoteRetrier.ProgressiveBackoff;
import com.google.devtools.build.lib.remote.common.RemoteActionExecutionContext;
import com.google.devtools.build.lib.remote.util.TracingMetadataUtils;
import com.google.devtools.build.lib.remote.util.Utils;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.Metadata;
import io.grpc.Status;
import io.grpc.Status.Code;
import io.grpc.StatusRuntimeException;
import io.netty.util.AbstractReferenceCounted;
import io.netty.util.ReferenceCounted;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicLong;
import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;
/**
* A client implementing the {@code Write} method of the {@code ByteStream} gRPC service.
*
* <p>The uploader supports reference counting to easily be shared between components with different
* lifecyles. After instantiation the reference count is {@code 1}.
*
* <p>See {@link ReferenceCounted} for more information on reference counting.
*/
class ByteStreamUploader extends AbstractReferenceCounted {
private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
private final String instanceName;
private final ReferenceCountedChannel channel;
private final CallCredentialsProvider callCredentialsProvider;
private final long callTimeoutSecs;
private final RemoteRetrier retrier;
private final Object lock = new Object();
/** Contains the hash codes of already uploaded blobs. * */
@GuardedBy("lock")
private final Set<HashCode> uploadedBlobs = new HashSet<>();
@GuardedBy("lock")
private final Map<Digest, ListenableFuture<Void>> uploadsInProgress = new HashMap<>();
@GuardedBy("lock")
private boolean isShutdown;
@Nullable private final Semaphore openedFilePermits;
/**
* Creates a new instance.
*
* @param instanceName the instance name to be prepended to resource name of the {@code Write}
* call. See the {@code ByteStream} service definition for details
* @param channel the {@link io.grpc.Channel} to use for calls
* @param callCredentialsProvider the credentials provider to use for authentication.
* @param callTimeoutSecs the timeout in seconds after which a {@code Write} gRPC call must be
* complete. The timeout resets between retries
* @param retrier the {@link RemoteRetrier} whose backoff strategy to use for retry timings.
*/
public ByteStreamUploader(
@Nullable String instanceName,
ReferenceCountedChannel channel,
CallCredentialsProvider callCredentialsProvider,
long callTimeoutSecs,
RemoteRetrier retrier,
int maximumOpenFiles) {
checkArgument(callTimeoutSecs > 0, "callTimeoutSecs must be gt 0.");
this.instanceName = instanceName;
this.channel = channel;
this.callCredentialsProvider = callCredentialsProvider;
this.callTimeoutSecs = callTimeoutSecs;
this.retrier = retrier;
this.openedFilePermits = maximumOpenFiles != -1 ? new Semaphore(maximumOpenFiles) : null;
}
@VisibleForTesting
ReferenceCountedChannel getChannel() {
return channel;
}
@VisibleForTesting
RemoteRetrier getRetrier() {
return retrier;
}
/**
* Uploads a BLOB, as provided by the {@link Chunker}, to the remote {@code ByteStream} service.
* The call blocks until the upload is complete, or throws an {@link Exception} in case of error.
*
* <p>Uploads are retried according to the specified {@link RemoteRetrier}. Retrying is
* transparent to the user of this API.
*
* <p>Trying to upload the same BLOB multiple times concurrently, results in only one upload being
* performed. This is transparent to the user of this API.
*
* @param hash the hash of the data to upload.
* @param chunker the data to upload.
* @param forceUpload if {@code false} the blob is not uploaded if it has previously been
* uploaded, if {@code true} the blob is uploaded.
* @throws IOException when reading of the {@link Chunker}s input source fails
*/
public void uploadBlob(
RemoteActionExecutionContext context, HashCode hash, Chunker chunker, boolean forceUpload)
throws IOException, InterruptedException {
uploadBlobs(context, singletonMap(hash, chunker), forceUpload);
}
/**
* Uploads a list of BLOBs concurrently to the remote {@code ByteStream} service. The call blocks
* until the upload of all BLOBs is complete, or throws an {@link Exception} after the first
* upload failed. Any other uploads will continue uploading in the background, until they complete
* or the {@link #shutdown()} method is called. Errors encountered by these uploads are swallowed.
*
* <p>Uploads are retried according to the specified {@link RemoteRetrier}. Retrying is
* transparent to the user of this API.
*
* <p>Trying to upload the same BLOB multiple times concurrently, results in only one upload being
* performed. This is transparent to the user of this API.
*
* @param chunkers the data to upload.
* @param forceUpload if {@code false} the blob is not uploaded if it has previously been
* uploaded, if {@code true} the blob is uploaded.
* @throws IOException when reading of the {@link Chunker}s input source or uploading fails
*/
public void uploadBlobs(
RemoteActionExecutionContext context, Map<HashCode, Chunker> chunkers, boolean forceUpload)
throws IOException, InterruptedException {
List<ListenableFuture<Void>> uploads = new ArrayList<>();
for (Map.Entry<HashCode, Chunker> chunkerEntry : chunkers.entrySet()) {
uploads.add(
uploadBlobAsync(context, chunkerEntry.getKey(), chunkerEntry.getValue(), forceUpload));
}
try {
for (ListenableFuture<Void> upload : uploads) {
upload.get();
}
} catch (ExecutionException e) {
Throwable cause = e.getCause();
Throwables.propagateIfInstanceOf(cause, IOException.class);
Throwables.propagateIfInstanceOf(cause, InterruptedException.class);
Throwables.propagate(cause);
}
}
/**
* Cancels all running uploads. The method returns immediately and does NOT wait for the uploads
* to be cancelled.
*
* <p>This method should not be called directly, but will be called implicitly when the reference
* count reaches {@code 0}.
*/
@VisibleForTesting
void shutdown() {
synchronized (lock) {
if (isShutdown) {
return;
}
isShutdown = true;
// Before cancelling, copy the futures to a separate list in order to avoid concurrently
// iterating over and modifying the map (cancel triggers a listener that removes the entry
// from the map. the listener is executed in the same thread.).
List<Future<Void>> uploadsToCancel = new ArrayList<>(uploadsInProgress.values());
for (Future<Void> upload : uploadsToCancel) {
upload.cancel(true);
}
}
}
/**
* @deprecated Use {@link #uploadBlobAsync(RemoteActionExecutionContext, Digest, Chunker,
* boolean)} instead.
*/
@Deprecated
public ListenableFuture<Void> uploadBlobAsync(
RemoteActionExecutionContext context, HashCode hash, Chunker chunker, boolean forceUpload) {
Digest digest =
Digest.newBuilder().setHash(hash.toString()).setSizeBytes(chunker.getSize()).build();
return uploadBlobAsync(context, digest, chunker, forceUpload);
}
/**
* Uploads a BLOB asynchronously to the remote {@code ByteStream} service. The call returns
* immediately and one can listen to the returned future for the success/failure of the upload.
*
* <p>Uploads are retried according to the specified {@link RemoteRetrier}. Retrying is
* transparent to the user of this API.
*
* <p>Trying to upload the same BLOB multiple times concurrently, results in only one upload being
* performed. This is transparent to the user of this API.
*
* @param digest the {@link Digest} of the data to upload.
* @param chunker the data to upload.
* @param forceUpload if {@code false} the blob is not uploaded if it has previously been
* uploaded, if {@code true} the blob is uploaded.
*/
public ListenableFuture<Void> uploadBlobAsync(
RemoteActionExecutionContext context, Digest digest, Chunker chunker, boolean forceUpload) {
synchronized (lock) {
checkState(!isShutdown, "Must not call uploadBlobs after shutdown.");
if (!forceUpload && uploadedBlobs.contains(HashCode.fromString(digest.getHash()))) {
return immediateVoidFuture();
}
ListenableFuture<Void> inProgress = uploadsInProgress.get(digest);
if (inProgress != null) {
return inProgress;
}
ListenableFuture<Void> uploadResult =
Futures.transform(
startAsyncUpload(context, digest, chunker),
(v) -> {
synchronized (lock) {
uploadedBlobs.add(HashCode.fromString(digest.getHash()));
}
return null;
},
MoreExecutors.directExecutor());
uploadResult =
Futures.catchingAsync(
uploadResult,
StatusRuntimeException.class,
(sre) ->
Futures.immediateFailedFuture(
new IOException(
String.format(
"Error while uploading artifact with digest '%s/%s'",
digest.getHash(), digest.getSizeBytes()),
sre)),
MoreExecutors.directExecutor());
uploadsInProgress.put(digest, uploadResult);
uploadResult.addListener(
() -> {
synchronized (lock) {
uploadsInProgress.remove(digest);
}
},
MoreExecutors.directExecutor());
return uploadResult;
}
}
@VisibleForTesting
boolean uploadsInProgress() {
synchronized (lock) {
return !uploadsInProgress.isEmpty();
}
}
private static String buildUploadResourceName(
String instanceName, UUID uuid, Digest digest, boolean compressed) {
String template =
compressed ? "uploads/%s/compressed-blobs/zstd/%s/%d" : "uploads/%s/blobs/%s/%d";
String resourceName = format(template, uuid, digest.getHash(), digest.getSizeBytes());
if (!Strings.isNullOrEmpty(instanceName)) {
resourceName = instanceName + "/" + resourceName;
}
return resourceName;
}
/** Starts a file upload and returns a future representing the upload. */
private ListenableFuture<Void> startAsyncUpload(
RemoteActionExecutionContext context, Digest digest, Chunker chunker) {
try {
chunker.reset();
} catch (IOException e) {
return Futures.immediateFailedFuture(e);
}
if (chunker.getSize() != digest.getSizeBytes()) {
return Futures.immediateFailedFuture(
new IllegalStateException(
String.format(
"Expected chunker size of %d, got %d",
digest.getSizeBytes(), chunker.getSize())));
}
UUID uploadId = UUID.randomUUID();
String resourceName =
buildUploadResourceName(instanceName, uploadId, digest, chunker.isCompressed());
AsyncUpload newUpload =
new AsyncUpload(
context,
channel,
callCredentialsProvider,
callTimeoutSecs,
retrier,
resourceName,
chunker);
if (openedFilePermits != null) {
try {
openedFilePermits.acquire();
} catch (InterruptedException e) {
return Futures.immediateFailedFuture(
new InterruptedException(
"Unexpected interrupt while acquiring open file permit. Original error message: "
+ e.getMessage()));
}
}
ListenableFuture<Void> currUpload = newUpload.start();
currUpload.addListener(
() -> {
if (currUpload.isCancelled()) {
newUpload.cancel();
}
},
MoreExecutors.directExecutor());
return currUpload;
}
@Override
public ByteStreamUploader retain() {
return (ByteStreamUploader) super.retain();
}
@Override
public ByteStreamUploader retain(int increment) {
return (ByteStreamUploader) super.retain(increment);
}
@Override
protected void deallocate() {
shutdown();
channel.release();
}
@Override
public ReferenceCounted touch(Object o) {
return this;
}
private class AsyncUpload {
private final RemoteActionExecutionContext context;
private final ReferenceCountedChannel channel;
private final CallCredentialsProvider callCredentialsProvider;
private final long callTimeoutSecs;
private final Retrier retrier;
private final String resourceName;
private final Chunker chunker;
private ClientCall<WriteRequest, WriteResponse> call;
AsyncUpload(
RemoteActionExecutionContext context,
ReferenceCountedChannel channel,
CallCredentialsProvider callCredentialsProvider,
long callTimeoutSecs,
Retrier retrier,
String resourceName,
Chunker chunker) {
this.context = context;
this.channel = channel;
this.callCredentialsProvider = callCredentialsProvider;
this.callTimeoutSecs = callTimeoutSecs;
this.retrier = retrier;
this.resourceName = resourceName;
this.chunker = chunker;
}
ListenableFuture<Void> start() {
ProgressiveBackoff progressiveBackoff = new ProgressiveBackoff(retrier::newBackoff);
AtomicLong committedOffset = new AtomicLong(0);
ListenableFuture<Void> callFuture =
Utils.refreshIfUnauthenticatedAsync(
() ->
retrier.executeAsync(
() -> {
if (chunker.getSize() == committedOffset.get()) {
return immediateVoidFuture();
}
try {
chunker.seek(committedOffset.get());
} catch (IOException e) {
try {
chunker.reset();
} catch (IOException resetException) {
e.addSuppressed(resetException);
}
String tooManyOpenFilesError = "Too many open files";
if (Ascii.toLowerCase(e.getMessage())
.contains(Ascii.toLowerCase(tooManyOpenFilesError))) {
String newMessage =
"An IOException was thrown because the process opened too many"
+ " files. We recommend setting"
+ " --bep_maximum_open_remote_upload_files flag to a number"
+ " lower than your system default (run 'ulimit -a' for"
+ " *nix-based operating systems). Original error message: "
+ e.getMessage();
return Futures.immediateFailedFuture(new IOException(newMessage, e));
}
return Futures.immediateFailedFuture(e);
}
if (chunker.hasNext()) {
return callAndQueryOnFailure(committedOffset, progressiveBackoff);
}
return immediateVoidFuture();
},
progressiveBackoff),
callCredentialsProvider);
if (openedFilePermits != null) {
callFuture.addListener(openedFilePermits::release, MoreExecutors.directExecutor());
}
return Futures.transformAsync(
callFuture,
(result) -> {
if (!chunker.hasNext()) {
// Only check for matching committed size if we have completed the upload.
// If another client did, they might have used a different compression
// level/algorithm, so we cannot know the expected committed offset
long committedSize = committedOffset.get();
long expected = chunker.getOffset();
if (!chunker.hasNext() && committedSize != expected) {
String message =
format(
"write incomplete: committed_size %d for %d total",
committedSize, expected);
return Futures.immediateFailedFuture(new IOException(message));
}
}
return immediateVoidFuture();
},
MoreExecutors.directExecutor());
}
private ByteStreamFutureStub bsFutureStub(Channel channel) {
return ByteStreamGrpc.newFutureStub(channel)
.withInterceptors(
TracingMetadataUtils.attachMetadataInterceptor(context.getRequestMetadata()))
.withCallCredentials(callCredentialsProvider.getCallCredentials())
.withDeadlineAfter(callTimeoutSecs, SECONDS);
}
private ListenableFuture<Void> callAndQueryOnFailure(
AtomicLong committedOffset, ProgressiveBackoff progressiveBackoff) {
return Futures.catchingAsync(
Futures.transform(
channel.withChannelFuture(channel -> call(committedOffset, channel)),
written -> null,
MoreExecutors.directExecutor()),
Exception.class,
(e) -> guardQueryWithSuppression(e, committedOffset, progressiveBackoff),
MoreExecutors.directExecutor());
}
private ListenableFuture<Void> guardQueryWithSuppression(
Exception e, AtomicLong committedOffset, ProgressiveBackoff progressiveBackoff) {
// we are destined to return this, avoid recreating it
ListenableFuture<Void> exceptionFuture = Futures.immediateFailedFuture(e);
// TODO(buchgr): we should also return immediately without the query if
// we were out of retry attempts for the underlying backoff. This
// is meant to be an only in-between-retries query request.
if (!retrier.isRetriable(e)) {
return exceptionFuture;
}
ListenableFuture<Void> suppressedQueryFuture =
Futures.catchingAsync(
query(committedOffset, progressiveBackoff),
Exception.class,
(queryException) -> {
// if the query threw an exception, add it to the suppressions
// for the destined exception
e.addSuppressed(queryException);
return exceptionFuture;
},
MoreExecutors.directExecutor());
return Futures.transformAsync(
suppressedQueryFuture, (result) -> exceptionFuture, MoreExecutors.directExecutor());
}
private ListenableFuture<Void> query(
AtomicLong committedOffset, ProgressiveBackoff progressiveBackoff) {
ListenableFuture<Long> committedSizeFuture =
Futures.transform(
channel.withChannelFuture(
channel ->
bsFutureStub(channel)
.queryWriteStatus(
QueryWriteStatusRequest.newBuilder()
.setResourceName(resourceName)
.build())),
QueryWriteStatusResponse::getCommittedSize,
MoreExecutors.directExecutor());
ListenableFuture<Long> guardedCommittedSizeFuture =
Futures.catchingAsync(
committedSizeFuture,
Exception.class,
(e) -> {
Status status = Status.fromThrowable(e);
if (status.getCode() == Code.UNIMPLEMENTED) {
// if the bytestream server does not implement the query, insist
// that we should reset the upload
return Futures.immediateFuture(0L);
}
return Futures.immediateFailedFuture(e);
},
MoreExecutors.directExecutor());
return Futures.transformAsync(
guardedCommittedSizeFuture,
(committedSize) -> {
if (committedSize > committedOffset.get()) {
// we have made progress on this upload in the last request,
// reset the backoff so that this request has a full deck of retries
progressiveBackoff.reset();
}
committedOffset.set(committedSize);
return immediateVoidFuture();
},
MoreExecutors.directExecutor());
}
private ListenableFuture<Long> call(AtomicLong committedOffset, Channel channel) {
CallOptions callOptions =
CallOptions.DEFAULT
.withCallCredentials(callCredentialsProvider.getCallCredentials())
.withDeadlineAfter(callTimeoutSecs, SECONDS);
call = channel.newCall(ByteStreamGrpc.getWriteMethod(), callOptions);
SettableFuture<Long> uploadResult = SettableFuture.create();
ClientCall.Listener<WriteResponse> callListener =
new ClientCall.Listener<WriteResponse>() {
private final WriteRequest.Builder requestBuilder = WriteRequest.newBuilder();
private boolean callHalfClosed = false;
void halfClose() {
// call.halfClose() may only be called once. Guard against it being called more
// often.
// See: https://github.com/grpc/grpc-java/issues/3201
if (!callHalfClosed) {
callHalfClosed = true;
// Every chunk has been written. No more work to do.
call.halfClose();
}
}
@Override
public void onMessage(WriteResponse response) {
// upload was completed either by us or someone else
committedOffset.set(response.getCommittedSize());
halfClose();
}
@Override
public void onClose(Status status, Metadata trailers) {
if (status.isOk()) {
uploadResult.set(committedOffset.get());
} else {
uploadResult.setException(status.asRuntimeException());
}
}
@Override
public void onReady() {
while (call.isReady()) {
if (!chunker.hasNext()) {
halfClose();
return;
}
if (callHalfClosed) {
return;
}
try {
requestBuilder.clear();
Chunker.Chunk chunk = chunker.next();
if (chunk.getOffset() == committedOffset.get()) {
// Resource name only needs to be set on the first write for each file.
requestBuilder.setResourceName(resourceName);
}
boolean isLastChunk = !chunker.hasNext();
WriteRequest request =
requestBuilder
.setData(chunk.getData())
.setWriteOffset(chunk.getOffset())
.setFinishWrite(isLastChunk)
.build();
call.sendMessage(request);
} catch (IOException e) {
try {
chunker.reset();
} catch (IOException e1) {
// This exception indicates that closing the underlying input stream failed.
// We don't expect this to ever happen, but don't want to swallow the exception
// completely.
logger.atWarning().withCause(e1).log("Chunker failed closing data source.");
} finally {
call.cancel("Failed to read next chunk.", e);
}
}
}
}
};
call.start(
callListener,
TracingMetadataUtils.headersFromRequestMetadata(context.getRequestMetadata()));
call.request(1);
return uploadResult;
}
void cancel() {
if (call != null) {
call.cancel("Cancelled by user.", null);
}
}
}
@VisibleForTesting
public Semaphore getOpenedFilePermits() {
return openedFilePermits;
}
}