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// Copyright (c) 2012 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.
#ifndef CHROME_BROWSER_NET_NET_ERROR_TAB_HELPER_H_
#define CHROME_BROWSER_NET_NET_ERROR_TAB_HELPER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/api/prefs/pref_member.h"
#include "chrome/browser/net/dns_probe_service.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
namespace chrome_browser_net {
// A TabHelper that monitors loads for certain types of network errors and
// does interesting things with them. Currently, starts DNS probes using the
// DnsProbeService whenever a page fails to load with a DNS-related error.
class NetErrorTabHelper
: public content::WebContentsObserver,
public content::WebContentsUserData<NetErrorTabHelper> {
public:
virtual ~NetErrorTabHelper();
// content::WebContentsObserver implementation.
virtual void DidFailProvisionalLoad(
int64 frame_id,
bool is_main_frame,
const GURL& validated_url,
int error_code,
const string16& error_description,
content::RenderViewHost* render_view_host) OVERRIDE;
void OnDnsProbeFinished(DnsProbeService::Result result);
static void set_enabled_for_testing(bool enabled_for_testing);
protected:
friend class content::WebContentsUserData<NetErrorTabHelper>;
// |contents| is the WebContents of the tab this NetErrorTabHelper is
// attached to.
explicit NetErrorTabHelper(content::WebContents* contents);
// Posts a task to the IO thread that will start a DNS probe.
virtual void PostStartDnsProbeTask();
// Checks if probes are allowed by enabled_for_testing and "use web service"
// pref.
virtual bool ProbesAllowed() const;
bool dns_probe_running() { return dns_probe_running_; }
void set_dns_probe_running(bool running) { dns_probe_running_ = running; }
private:
void InitializePref(content::WebContents* contents);
void OnMainFrameDnsError();
// Whether the tab helper has started a DNS probe that has not yet returned
// a result.
bool dns_probe_running_;
// "Use a web service to resolve navigation errors" preference is required
// to allow probes.
BooleanPrefMember resolve_errors_with_web_service_;
// Whether the above pref was initialized -- will be false in unit tests.
bool pref_initialized_;
base::WeakPtrFactory<NetErrorTabHelper> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(NetErrorTabHelper);
};
} // namespace chrome_browser_net
#endif // CHROME_BROWSER_NET_NET_ERROR_TAB_HELPER_H_
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