1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "chrome/browser/component_updater/crx_downloader.h"
7 #include "base/logging.h"
8 #include "base/sequenced_task_runner.h"
9 #include "base/single_thread_task_runner.h"
10 #include "chrome/browser/component_updater/url_fetcher_downloader.h"
13 #include "chrome/browser/component_updater/background_downloader_win.h"
16 namespace component_updater {
18 CrxDownloader::Result::Result()
19 : error(0), downloaded_bytes(-1), total_bytes(-1) {
22 CrxDownloader::DownloadMetrics::DownloadMetrics()
30 // On Windows, the first downloader in the chain is a background downloader,
31 // which uses the BITS service.
32 CrxDownloader* CrxDownloader::Create(
33 bool is_background_download,
34 net::URLRequestContextGetter* context_getter,
35 scoped_refptr<base::SequencedTaskRunner> url_fetcher_task_runner,
36 scoped_refptr<base::SingleThreadTaskRunner> background_task_runner) {
37 scoped_ptr<CrxDownloader> url_fetcher_downloader(
38 new UrlFetcherDownloader(scoped_ptr<CrxDownloader>().Pass(),
40 url_fetcher_task_runner));
42 if (is_background_download) {
43 return new BackgroundDownloader(
44 url_fetcher_downloader.Pass(), context_getter, background_task_runner);
48 return url_fetcher_downloader.release();
51 CrxDownloader::CrxDownloader(scoped_ptr<CrxDownloader> successor)
52 : successor_(successor.Pass()) {
55 CrxDownloader::~CrxDownloader() {
58 void CrxDownloader::set_progress_callback(
59 const ProgressCallback& progress_callback) {
60 progress_callback_ = progress_callback;
63 GURL CrxDownloader::url() const {
64 return current_url_ != urls_.end() ? *current_url_ : GURL();
67 const std::vector<CrxDownloader::DownloadMetrics>
68 CrxDownloader::download_metrics() const {
70 return download_metrics_;
72 std::vector<DownloadMetrics> retval(successor_->download_metrics());
74 retval.begin(), download_metrics_.begin(), download_metrics_.end());
78 void CrxDownloader::StartDownloadFromUrl(
80 const DownloadCallback& download_callback) {
81 std::vector<GURL> urls;
83 StartDownload(urls, download_callback);
86 void CrxDownloader::StartDownload(const std::vector<GURL>& urls,
87 const DownloadCallback& download_callback) {
88 DCHECK(thread_checker_.CalledOnValidThread());
91 // Make a result and complete the download with a generic error for now.
94 download_callback.Run(result);
98 // If the urls are mutated while this downloader is active, then the
99 // behavior is undefined in the sense that the outcome of the download could
100 // be inconsistent for the list of urls. At any rate, the |current_url_| is
101 // reset at this point, and the iterator will be valid in all conditions.
103 current_url_ = urls_.begin();
104 download_callback_ = download_callback;
106 DoStartDownload(*current_url_);
109 void CrxDownloader::OnDownloadComplete(
111 const Result& result,
112 const DownloadMetrics& download_metrics) {
113 DCHECK(thread_checker_.CalledOnValidThread());
115 download_metrics_.push_back(download_metrics);
118 // If an error has occured, in general try the next url if there is any,
119 // then move on to the successor in the chain if there is any successor.
120 // If this downloader has received a 5xx error for the current url,
121 // as indicated by the |is_handled| flag, remove that url from the list of
122 // urls so the url is never retried. In both cases, move on to the
127 current_url_ = urls_.erase(current_url_);
130 // Try downloading from another url from the list.
131 if (current_url_ != urls_.end()) {
132 DoStartDownload(*current_url_);
136 // If there is another downloader that can accept this request, then hand
137 // the request over to it so that the successor can try the pruned list
138 // of urls. Otherwise, the request ends here since the current downloader
139 // has tried all urls and it can't fall back on any other downloader.
140 if (successor_ && !urls_.empty()) {
141 successor_->StartDownload(urls_, download_callback_);
146 download_callback_.Run(result);
149 void CrxDownloader::OnDownloadProgress(const Result& result) {
150 DCHECK(thread_checker_.CalledOnValidThread());
152 if (progress_callback_.is_null())
155 progress_callback_.Run(result);
158 } // namespace component_updater