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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/download/internal/common/download_worker.h"
#include <memory>
#include "base/functional/bind.h"
#include "base/task/single_thread_task_runner.h"
#include "components/download/internal/common/resource_downloader.h"
#include "components/download/public/common/download_create_info.h"
#include "components/download/public/common/download_interrupt_reasons.h"
#include "components/download/public/common/download_stats.h"
#include "components/download/public/common/download_task_runner.h"
#include "components/download/public/common/download_utils.h"
#include "components/download/public/common/input_stream.h"
#include "components/download/public/common/url_download_handler_factory.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
namespace download {
namespace {
const int kWorkerVerboseLevel = 1;
bool IsURLSafe(int render_process_id, const GURL& url) {
// The URL will be checked in the main request, parallel request will ignore
// the security check here.
return true;
}
class CompletedInputStream : public InputStream {
public:
CompletedInputStream(DownloadInterruptReason status) : status_(status) {}
CompletedInputStream(const CompletedInputStream&) = delete;
CompletedInputStream& operator=(const CompletedInputStream&) = delete;
~CompletedInputStream() override = default;
// InputStream
bool IsEmpty() override { return false; }
InputStream::StreamState Read(scoped_refptr<net::IOBuffer>* data,
size_t* length) override {
*length = 0;
return InputStream::StreamState::COMPLETE;
}
DownloadInterruptReason GetCompletionStatus() override { return status_; }
private:
DownloadInterruptReason status_;
};
void CreateUrlDownloadHandler(
std::unique_ptr<DownloadUrlParameters> params,
base::WeakPtr<UrlDownloadHandler::Delegate> delegate,
URLLoaderFactoryProvider* url_loader_factory_provider,
const URLSecurityPolicy& url_security_policy,
mojo::PendingRemote<device::mojom::WakeLockProvider> wake_lock_provider,
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
auto downloader = UrlDownloadHandlerFactory::Create(
std::move(params), delegate,
url_loader_factory_provider
? url_loader_factory_provider->GetURLLoaderFactory()
: nullptr,
url_security_policy, std::move(wake_lock_provider), task_runner);
task_runner->PostTask(
FROM_HERE,
base::BindOnce(&UrlDownloadHandler::Delegate::OnUrlDownloadHandlerCreated,
delegate, std::move(downloader)));
}
} // namespace
DownloadWorker::DownloadWorker(DownloadWorker::Delegate* delegate,
int64_t offset)
: delegate_(delegate),
offset_(offset),
is_paused_(false),
is_canceled_(false),
url_download_handler_(nullptr, base::OnTaskRunnerDeleter(nullptr)) {
DCHECK(delegate_);
}
DownloadWorker::~DownloadWorker() = default;
void DownloadWorker::SendRequest(
std::unique_ptr<DownloadUrlParameters> params,
URLLoaderFactoryProvider* url_loader_factory_provider,
mojo::PendingRemote<device::mojom::WakeLockProvider> wake_lock_provider) {
GetIOTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(&CreateUrlDownloadHandler, std::move(params),
weak_factory_.GetWeakPtr(),
// This is safe because URLLoaderFactoryProvider
// deleter is called on the same task sequence.
base::Unretained(url_loader_factory_provider),
base::BindRepeating(&IsURLSafe),
std::move(wake_lock_provider),
base::SingleThreadTaskRunner::GetCurrentDefault()));
}
void DownloadWorker::Pause() {
is_paused_ = true;
}
void DownloadWorker::Resume() {
is_paused_ = false;
}
void DownloadWorker::Cancel(bool user_cancel) {
is_canceled_ = true;
url_download_handler_.reset();
}
void DownloadWorker::OnUrlDownloadStarted(
std::unique_ptr<DownloadCreateInfo> create_info,
std::unique_ptr<InputStream> input_stream,
URLLoaderFactoryProvider::URLLoaderFactoryProviderPtr
url_loader_factory_provider,
UrlDownloadHandlerID downloader,
DownloadUrlParameters::OnStartedCallback callback) {
// |callback| is not used in subsequent requests.
DCHECK(callback.is_null());
// Destroy the request if user canceled.
if (is_canceled_) {
VLOG(kWorkerVerboseLevel)
<< "Byte stream arrived after user cancel the request.";
url_download_handler_.reset();
return;
}
if (offset_ != create_info->offset)
create_info->result = DOWNLOAD_INTERRUPT_REASON_SERVER_NO_RANGE;
if (create_info->result != DOWNLOAD_INTERRUPT_REASON_NONE) {
RecordParallelRequestCreationFailure(create_info->result);
VLOG(kWorkerVerboseLevel)
<< "Parallel download sub-request failed. reason = "
<< create_info->result;
input_stream = std::make_unique<CompletedInputStream>(create_info->result);
url_download_handler_.reset();
}
// Pause the stream if user paused, still push the stream reader to the sink.
if (is_paused_) {
VLOG(kWorkerVerboseLevel)
<< "Byte stream arrived after user pause the request.";
Pause();
}
delegate_->OnInputStreamReady(this, std::move(input_stream),
std::move(create_info));
}
void DownloadWorker::OnUrlDownloadStopped(UrlDownloadHandlerID downloader) {
// Release the |url_download_handler_|, the object will be deleted on IO
// thread.
url_download_handler_.reset();
}
void DownloadWorker::OnUrlDownloadHandlerCreated(
UrlDownloadHandler::UniqueUrlDownloadHandlerPtr downloader) {
url_download_handler_ = std::move(downloader);
}
} // namespace download
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