Teach mojo_shell how to load http URLs

mojo/loader/loader.cc

+// Copyright (c) 2013 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 "mojo/loader/loader.h"
+
+#include "base/message_loop/message_loop.h"
+#include "base/threading/thread.h"
+#include "mojo/loader/url_request_context_getter.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace mojo {
+namespace loader {
+
+namespace {
+
+class JobImpl : public net::URLFetcherDelegate, public Job {

[Aaron Boodman, 2013/10/18 17:59:42]

Out of curiosity, I don't understand why the distinction here between Job and
JobImpl.

[abarth-chromium, 2013/10/18 18:05:29]

The idea is to avoid leaking the net headers to clients of mojo::loader.  I'd
like to avoid leaking dependencies on net so that we can later move the loader
out of mojo_shell and into a service, which will keep mojo_shell lean and mean
(since it's going to be loaded into every process).

+ public:
+  JobImpl(const GURL& app_url, Job::Delegate* delegate);
+  virtual ~JobImpl();
+
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+
+  net::URLFetcher* fetcher() const { return fetcher_.get(); }
+
+ private:
+  scoped_ptr<net::URLFetcher> fetcher_;
+  Job::Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(JobImpl);
+};
+
+JobImpl::JobImpl(const GURL& app_url, Job::Delegate* delegate)
+    : delegate_(delegate) {
+  fetcher_.reset(net::URLFetcher::Create(app_url, net::URLFetcher::GET, this));
+}
+
+JobImpl::~JobImpl() {
+}
+
+void JobImpl::OnURLFetchComplete(const net::URLFetcher* source) {
+  delegate_->DidCompleteLoad(source->GetURL());
+}
+
+scoped_ptr<base::Thread> CreateIOThread(const char* name) {
+  scoped_ptr<base::Thread> thread(new base::Thread(name));
+  base::Thread::Options options;
+  options.message_loop_type = base::MessageLoop::TYPE_IO;
+  thread->StartWithOptions(options);
+  return thread.Pass();
+}
+
+}  // namespace
+
+class Loader::Data {
+ public:
+  scoped_ptr<base::Thread> cache_thread;
+  scoped_refptr<URLRequestContextGetter> url_request_context_getter;
+};
+
+Loader::Loader(base::SingleThreadTaskRunner* network_runner,
+               base::FilePath base_path)
+    : data_(new Data()) {
+  data_->cache_thread = CreateIOThread("cache_thread");
+  data_->url_request_context_getter = new URLRequestContextGetter(
+      base_path, network_runner, data_->cache_thread->message_loop_proxy());
+}
+
+Loader::~Loader() {
+}
+
+scoped_ptr<Job> Loader::Load(const GURL& app_url, Job::Delegate* delegate) {
+  JobImpl* job = new JobImpl(app_url, delegate);
+  job->fetcher()->SetRequestContext(data_->url_request_context_getter.get());
+  job->fetcher()->Start();
+  return make_scoped_ptr(static_cast<Job*>(job));
+}
+
+}  // namespace loader
+}  // namespace mojo