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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/renderer/mhtml_handle_writer.h"
#include "base/containers/span.h"
#include "base/metrics/histogram_macros.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/trace_event/trace_event.h"
#include "content/common/download/mhtml_file_writer.mojom.h"
#include "content/public/renderer/render_thread.h"
#include "third_party/blink/public/platform/web_thread_safe_data.h"
namespace content {
MHTMLHandleWriter::MHTMLHandleWriter(
scoped_refptr<base::TaskRunner> main_thread_task_runner,
MHTMLWriteCompleteCallback callback)
: main_thread_task_runner_(std::move(main_thread_task_runner)),
callback_(std::move(callback)) {}
MHTMLHandleWriter::~MHTMLHandleWriter() {}
void MHTMLHandleWriter::WriteContents(
std::vector<blink::WebThreadSafeData> mhtml_contents) {
TRACE_EVENT_NESTABLE_ASYNC_BEGIN0("page-serialization",
"Writing MHTML contents to handle",
TRACE_ID_LOCAL(this));
is_writing_ = true;
WriteContentsImpl(std::move(mhtml_contents));
}
void MHTMLHandleWriter::Finish(mojom::MhtmlSaveStatus save_status) {
DCHECK(!RenderThread::IsMainThread())
<< "Should not run in the main renderer thread";
if (is_writing_) {
TRACE_EVENT_NESTABLE_ASYNC_END0("page-serialization",
"WriteContentsImpl (MHTMLHandleWriter)",
TRACE_ID_LOCAL(this));
}
Close();
main_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(std::move(callback_), save_status));
}
MHTMLFileHandleWriter::MHTMLFileHandleWriter(
scoped_refptr<base::TaskRunner> main_thread_task_runner,
MHTMLWriteCompleteCallback callback,
base::File file)
: MHTMLHandleWriter(std::move(main_thread_task_runner),
std::move(callback)),
file_(std::move(file)) {
#if BUILDFLAG(IS_FUCHSIA)
// TODO(crbug.com/42050414): Remove the Seek call.
// On fuchsia, fds do not share state. As the fd has been duped and sent from
// the browser process, it must be seeked to the end to ensure the data is
// appended.
file_.Seek(base::File::FROM_END, 0);
#endif // BUILDFLAG(IS_FUCHSIA)
}
MHTMLFileHandleWriter::~MHTMLFileHandleWriter() {}
void MHTMLFileHandleWriter::WriteContentsImpl(
std::vector<blink::WebThreadSafeData> mhtml_contents) {
for (const auto& data : mhtml_contents) {
if (data.IsEmpty()) {
continue;
}
if (!file_.WriteAtCurrentPosAndCheck(base::as_byte_span(data))) {
Finish(mojom::MhtmlSaveStatus::kFileWritingError);
return;
}
}
Finish(mojom::MhtmlSaveStatus::kSuccess);
}
void MHTMLFileHandleWriter::Close() {
file_.Close();
}
MHTMLProducerHandleWriter::MHTMLProducerHandleWriter(
scoped_refptr<base::TaskRunner> main_thread_task_runner,
MHTMLWriteCompleteCallback callback,
mojo::ScopedDataPipeProducerHandle producer)
: MHTMLHandleWriter(std::move(main_thread_task_runner),
std::move(callback)),
producer_(std::move(producer)),
current_block_(0),
write_position_(0) {}
void MHTMLProducerHandleWriter::WriteContentsImpl(
std::vector<blink::WebThreadSafeData> mhtml_contents) {
DCHECK(mhtml_contents_.empty());
mhtml_contents_ = std::move(mhtml_contents);
scoped_refptr<base::SequencedTaskRunner> task_runner =
base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
task_runner->PostTask(
FROM_HERE, base::BindOnce(&MHTMLProducerHandleWriter::BeginWatchingHandle,
base::Unretained(this)));
}
MHTMLProducerHandleWriter::~MHTMLProducerHandleWriter() {}
void MHTMLProducerHandleWriter::Close() {
producer_.reset();
}
void MHTMLProducerHandleWriter::BeginWatchingHandle() {
// mojo::SimpleWatcher's constructor by default gets a reference ptr
// to the current SequencedTaskRunner if one is not specified, keeping
// the current SequencedTaskRunner's lifetime bound to |watcher_|.
watcher_ = std::make_unique<mojo::SimpleWatcher>(
FROM_HERE, mojo::SimpleWatcher::ArmingPolicy::AUTOMATIC);
// Using base::Unretained is safe, as |this| owns |watcher_|.
watcher_->Watch(
producer_.get(),
MOJO_HANDLE_SIGNAL_WRITABLE | MOJO_HANDLE_SIGNAL_PEER_CLOSED,
MOJO_WATCH_CONDITION_SATISFIED,
base::BindRepeating(&MHTMLProducerHandleWriter::TryWritingContents,
base::Unretained(this)));
}
// TODO(crbug.com/40606905): This can be simplified with usage
// of BlockingCopyToString once error signalling is implemented and
// updated with usage of base::span instead of std::string.
void MHTMLProducerHandleWriter::TryWritingContents(
MojoResult result,
const mojo::HandleSignalsState& state) {
if (result != MOJO_RESULT_OK) {
DLOG(ERROR)
<< "Error receiving notifications from producer handle watcher.";
Finish(mojom::MhtmlSaveStatus::kStreamingError);
return;
}
while (true) {
const blink::WebThreadSafeData& data = mhtml_contents_.at(current_block_);
base::span<const uint8_t> bytes =
base::as_byte_span(data).subspan(write_position_);
// If there is no more data in this block, continue to next block or
// finish.
if (bytes.empty()) {
write_position_ = 0;
if (++current_block_ >= mhtml_contents_.size()) {
Finish(mojom::MhtmlSaveStatus::kSuccess);
return;
}
continue;
}
size_t bytes_written = 0;
result =
producer_->WriteData(bytes, MOJO_WRITE_DATA_FLAG_NONE, bytes_written);
// Break out of loop early if write was not successful to avoid
// incrementing the write position incorrectly.
if (result != MOJO_RESULT_OK)
break;
// Reaching this indicates a successful write.
write_position_ += bytes_written;
DCHECK(write_position_ <= data.size());
}
if (result != MOJO_RESULT_SHOULD_WAIT) {
Finish(mojom::MhtmlSaveStatus::kStreamingError);
}
// Buffer is full, return to automatically re-arm the watcher.
}
} // namespace content
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