chrome/browser/net/net_error_tab_helper.h

   1 // Copyright (c) 2012 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.
   4
   5 #ifndef CHROME_BROWSER_NET_NET_ERROR_TAB_HELPER_H_
   6 #define CHROME_BROWSER_NET_NET_ERROR_TAB_HELPER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/bind.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/prefs/pref_member.h"
  13 #include "chrome/browser/net/dns_probe_service.h"
  14 #include "components/error_page/common/net_error_info.h"
  15 #include "content/public/browser/web_contents_observer.h"
  16 #include "content/public/browser/web_contents_user_data.h"
  17
  18 namespace chrome_browser_net {
  19
  20 // A TabHelper that monitors loads for certain types of network errors and
  21 // does interesting things with them.  Currently, starts DNS probes using the
  22 // DnsProbeService whenever a page fails to load with a DNS-related error.
  23 class NetErrorTabHelper
  24     : public content::WebContentsObserver,
  25       public content::WebContentsUserData<NetErrorTabHelper> {
  26  public:
  27   enum TestingState {
  28     TESTING_DEFAULT,
  29     TESTING_FORCE_DISABLED,
  30     TESTING_FORCE_ENABLED
  31   };
  32
  33   typedef base::Callback<void(chrome_common_net::DnsProbeStatus)>
  34       DnsProbeStatusSnoopCallback;
  35
  36   ~NetErrorTabHelper() override;
  37
  38   static void set_state_for_testing(TestingState testing_state);
  39
  40   // Sets a callback that will be called immediately after the helper sends
  41   // a NetErrorHelper IPC.  (Used by the DNS probe browser test to know when to
  42   // check the error page for updates, instead of polling.)
  43   void set_dns_probe_status_snoop_callback_for_testing(
  44       const DnsProbeStatusSnoopCallback& dns_probe_status_snoop_callback) {
  45     dns_probe_status_snoop_callback_ = dns_probe_status_snoop_callback;
  46   }
  47
  48   // content::WebContentsObserver implementation.
  49   void DidStartNavigationToPendingEntry(
  50       const GURL& url,
  51       content::NavigationController::ReloadType reload_type) override;
  52
  53   void DidStartProvisionalLoadForFrame(
  54       content::RenderFrameHost* render_frame_host,
  55       const GURL& validated_url,
  56       bool is_error_page,
  57       bool is_iframe_srcdoc) override;
  58
  59   void DidCommitProvisionalLoadForFrame(
  60       content::RenderFrameHost* render_frame_host,
  61       const GURL& url,
  62       ui::PageTransition transition_type) override;
  63
  64   void DidFailProvisionalLoad(content::RenderFrameHost* render_frame_host,
  65                               const GURL& validated_url,
  66                               int error_code,
  67                               const base::string16& error_description,
  68                               bool was_ignored_by_handler) override;
  69
  70  protected:
  71   // |contents| is the WebContents of the tab this NetErrorTabHelper is
  72   // attached to.
  73   explicit NetErrorTabHelper(content::WebContents* contents);
  74   virtual void StartDnsProbe();
  75   virtual void SendInfo();
  76   void OnDnsProbeFinished(chrome_common_net::DnsProbeStatus result);
  77
  78   chrome_common_net::DnsProbeStatus dns_probe_status() const {
  79     return dns_probe_status_;
  80   }
  81
  82  private:
  83   friend class content::WebContentsUserData<NetErrorTabHelper>;
  84
  85   void OnMainFrameDnsError();
  86
  87   void InitializePref(content::WebContents* contents);
  88   bool ProbesAllowed() const;
  89
  90   // True if the last provisional load that started was for an error page.
  91   bool is_error_page_;
  92
  93   // True if the helper has seen a main frame page load fail with a DNS error,
  94   // but has not yet seen a new page commit successfully afterwards.
  95   bool dns_error_active_;
  96
  97   // True if the helper has seen an error page commit while |dns_error_active_|
  98   // is true.  (This should never be true if |dns_error_active_| is false.)
  99   bool dns_error_page_committed_;
 100
 101   // The status of a DNS probe that may or may not have started or finished.
 102   // Since the renderer can change out from under the helper (in cross-process
 103   // navigations), it re-sends the status whenever an error page commits.
 104   chrome_common_net::DnsProbeStatus dns_probe_status_;
 105
 106   // Optional callback for browser test to snoop on outgoing NetErrorInfo IPCs.
 107   DnsProbeStatusSnoopCallback dns_probe_status_snoop_callback_;
 108
 109   // "Use a web service to resolve navigation errors" preference is required
 110   // to allow probes.
 111   BooleanPrefMember resolve_errors_with_web_service_;
 112
 113   base::WeakPtrFactory<NetErrorTabHelper> weak_factory_;
 114
 115   DISALLOW_COPY_AND_ASSIGN(NetErrorTabHelper);
 116 };
 117
 118 }  // namespace chrome_browser_net
 119
 120 #endif  // CHROME_BROWSER_NET_NET_ERROR_TAB_HELPER_H_