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// Copyright 2017 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/download/download_worker.h"
#include "components/download/public/common/download_create_info.h"
#include "components/download/public/common/download_interrupt_reasons.h"
#include "content/browser/byte_stream.h"
#include "content/browser/download/download_utils.h"
#include "content/browser/download/resource_downloader.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_features.h"
#include "services/network/public/cpp/features.h"
namespace content {
namespace {
const int kWorkerVerboseLevel = 1;
class CompletedByteStreamReader : public ByteStreamReader {
public:
CompletedByteStreamReader(int status) : status_(status) {};
~CompletedByteStreamReader() override = default;
// ByteStreamReader implementations:
ByteStreamReader::StreamState Read(scoped_refptr<net::IOBuffer>* data,
size_t* length) override {
return ByteStreamReader::STREAM_COMPLETE;
}
int GetStatus() const override { return status_; }
void RegisterCallback(const base::Closure& sink_callback) override {}
private:
int status_;
};
std::unique_ptr<UrlDownloadHandler, BrowserThread::DeleteOnIOThread>
CreateUrlDownloadHandler(
std::unique_ptr<download::DownloadUrlParameters> params,
base::WeakPtr<UrlDownloadHandler::Delegate> delegate,
scoped_refptr<URLLoaderFactoryGetter> url_loader_factory_getter) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
std::unique_ptr<network::ResourceRequest> request =
CreateResourceRequest(params.get());
return std::unique_ptr<ResourceDownloader, BrowserThread::DeleteOnIOThread>(
ResourceDownloader::BeginDownload(
delegate, std::move(params), std::move(request),
url_loader_factory_getter->GetNetworkFactory(), GURL(), GURL(),
GURL(), download::DownloadItem::kInvalidId, true)
.release());
} else {
// Build the URLRequest, BlobDataHandle is hold in original request for
// image download.
std::unique_ptr<net::URLRequest> url_request =
DownloadRequestCore::CreateRequestOnIOThread(
download::DownloadItem::kInvalidId, params.get());
return std::unique_ptr<UrlDownloader, BrowserThread::DeleteOnIOThread>(
UrlDownloader::BeginDownload(delegate, std::move(url_request),
params.get(), true)
.release());
}
}
} // namespace
DownloadWorker::DownloadWorker(DownloadWorker::Delegate* delegate,
int64_t offset,
int64_t length)
: delegate_(delegate),
offset_(offset),
length_(length),
is_paused_(false),
is_canceled_(false),
is_user_cancel_(false),
weak_factory_(this) {
DCHECK(delegate_);
}
DownloadWorker::~DownloadWorker() = default;
void DownloadWorker::SendRequest(
std::unique_ptr<download::DownloadUrlParameters> params,
scoped_refptr<URLLoaderFactoryGetter> url_loader_factory_getter) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
BrowserThread::PostTaskAndReplyWithResult(
BrowserThread::IO, FROM_HERE,
base::BindOnce(&CreateUrlDownloadHandler, std::move(params),
weak_factory_.GetWeakPtr(), url_loader_factory_getter),
base::BindOnce(&DownloadWorker::AddUrlDownloadHandler,
weak_factory_.GetWeakPtr()));
}
void DownloadWorker::Pause() {
is_paused_ = true;
if (request_handle_)
request_handle_->PauseRequest();
}
void DownloadWorker::Resume() {
is_paused_ = false;
if (request_handle_)
request_handle_->ResumeRequest();
}
void DownloadWorker::Cancel(bool user_cancel) {
is_canceled_ = true;
is_user_cancel_ = user_cancel;
if (request_handle_)
request_handle_->CancelRequest(user_cancel);
}
void DownloadWorker::OnUrlDownloadStarted(
std::unique_ptr<download::DownloadCreateInfo> create_info,
std::unique_ptr<DownloadManager::InputStream> input_stream,
const download::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.";
create_info->request_handle->CancelRequest(is_user_cancel_);
return;
}
// TODO(xingliu): Add metric for error handling.
if (create_info->result != download::DOWNLOAD_INTERRUPT_REASON_NONE) {
VLOG(kWorkerVerboseLevel)
<< "Parallel download sub-request failed. reason = "
<< create_info->result;
input_stream->stream_reader_.reset(
new CompletedByteStreamReader(create_info->result));
}
request_handle_ = std::move(create_info->request_handle);
// 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));
}
void DownloadWorker::OnUrlDownloadStopped(UrlDownloadHandler* downloader) {
// Release the |url_download_handler_|, the object will be deleted on IO
// thread.
url_download_handler_.reset();
}
void DownloadWorker::AddUrlDownloadHandler(
std::unique_ptr<UrlDownloadHandler, BrowserThread::DeleteOnIOThread>
downloader) {
url_download_handler_ = std::move(downloader);
}
} // namespace content
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