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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/devtools/devtools_stream_file.h"
#include "base/base64.h"
#include "base/bind.h"
#include "base/files/file_util.h"
#include "base/sequenced_task_runner.h"
#include "base/strings/string_util.h"
#include "base/task/lazy_thread_pool_task_runner.h"
#include "base/third_party/icu/icu_utf.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "storage/browser/file_system/file_system_context.h"
namespace content {
scoped_refptr<base::SequencedTaskRunner> impl_task_runner() {
constexpr base::TaskTraits kBlockingTraits = {
base::MayBlock(), base::TaskPriority::BEST_EFFORT};
static base::LazyThreadPoolSequencedTaskRunner s_sequenced_task_unner =
LAZY_THREAD_POOL_SEQUENCED_TASK_RUNNER_INITIALIZER(kBlockingTraits);
return s_sequenced_task_unner.Get();
}
scoped_refptr<DevToolsStreamFile> DevToolsStreamFile::Create(
DevToolsIOContext* context,
bool binary) {
return new DevToolsStreamFile(context, binary);
}
DevToolsStreamFile::DevToolsStreamFile(DevToolsIOContext* context, bool binary)
: DevToolsIOContext::Stream(impl_task_runner()),
handle_(Register(context)),
binary_(binary),
task_runner_(impl_task_runner()),
had_errors_(false),
last_read_pos_(0) {}
DevToolsStreamFile::~DevToolsStreamFile() {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
}
bool DevToolsStreamFile::InitOnFileSequenceIfNeeded() {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
if (had_errors_)
return false;
if (file_.IsValid())
return true;
base::FilePath temp_path;
if (!base::CreateTemporaryFile(&temp_path)) {
LOG(ERROR) << "Failed to create temporary file";
had_errors_ = true;
return false;
}
const unsigned flags = base::File::FLAG_OPEN_TRUNCATED |
base::File::FLAG_WRITE | base::File::FLAG_READ |
base::File::FLAG_DELETE_ON_CLOSE;
file_.Initialize(temp_path, flags);
if (!file_.IsValid()) {
LOG(ERROR) << "Failed to open temporary file: " << temp_path.value() << ", "
<< base::File::ErrorToString(file_.error_details());
had_errors_ = true;
base::DeleteFile(temp_path);
return false;
}
return true;
}
void DevToolsStreamFile::Read(off_t position,
size_t max_size,
ReadCallback callback) {
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&DevToolsStreamFile::ReadOnFileSequence, this,
position, max_size, std::move(callback)));
}
void DevToolsStreamFile::Append(std::unique_ptr<std::string> data) {
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&DevToolsStreamFile::AppendOnFileSequence, this,
std::move(data)));
}
void DevToolsStreamFile::ReadOnFileSequence(off_t position,
size_t max_size,
ReadCallback callback) {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
Status status = StatusFailure;
std::unique_ptr<std::string> data;
bool base64_encoded = false;
if (file_.IsValid()) {
std::string buffer;
buffer.resize(max_size);
if (position < 0)
position = last_read_pos_;
int size_got = file_.ReadNoBestEffort(position, &*buffer.begin(), max_size);
if (size_got < 0) {
LOG(ERROR) << "Failed to read temporary file";
had_errors_ = true;
file_.Close();
} else {
// Provided client has requested sufficient large block, make their
// life easier by not truncating in the middle of a UTF-8 character.
if (size_got > 6 && !CBU8_IS_SINGLE(buffer[size_got - 1])) {
base::TruncateUTF8ToByteSize(buffer, size_got, &buffer);
size_got = buffer.size();
} else {
buffer.resize(size_got);
}
data.reset(new std::string(std::move(buffer)));
status = size_got ? StatusSuccess : StatusEOF;
last_read_pos_ = position + size_got;
}
}
if (binary_) {
std::string raw_data(std::move(*data));
base::Base64Encode(raw_data, data.get());
base64_encoded = true;
}
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), std::move(data),
base64_encoded, status));
}
void DevToolsStreamFile::AppendOnFileSequence(
std::unique_ptr<std::string> data) {
if (!InitOnFileSequenceIfNeeded())
return;
int size_written = file_.WriteAtCurrentPos(&*data->begin(), data->length());
if (size_written != static_cast<int>(data->length())) {
LOG(ERROR) << "Failed to write temporary file";
had_errors_ = true;
file_.Close();
}
}
} // namespace content
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