Surface button for loading stale cache copy on net error page.

chrome/renderer/net/net_error_helper_core.cc

 // Copyright 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 "chrome/renderer/net/net_error_helper_core.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/i18n/rtl.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/location.h"
+#include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string16.h"
 #include "base/values.h"
 #include "chrome/common/localized_error.h"
 #include "grit/generated_resources.h"
 #include "net/base/escape.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURLError.h"
@@ skipping 221 matching lines @@
   return params.release();
 }
 
 }  // namespace
 
 struct NetErrorHelperCore::ErrorPageInfo {
   ErrorPageInfo(blink::WebURLError error, bool was_failed_post)
       : error(error),
         was_failed_post(was_failed_post),
         needs_dns_updates(false),
+        reload_button_in_page(false),
+        load_stale_button_in_page(false),
         is_finished_loading(false) {
   }
 
   // Information about the failed page load.
   blink::WebURLError error;
   bool was_failed_post;
 
   // Information about the status of the error page.
 
   // True if a page is a DNS error page and has not yet received a final DNS
   // probe status.
   bool needs_dns_updates;
 
   // Navigation correction service url, which will be used in response to
   // certain types of network errors.  This is also stored by the
   // NetErrorHelperCore itself, but it stored here as well in case its modified
   // in the middle of an error page load.  Empty when no error page should be
   // fetched, or if there's already a fetch in progress.
   GURL navigation_correction_url;
 
   // Request body to use when requesting corrections from a web service.
   // TODO(mmenke):  Investigate loading the error page at the same time as
   //                the blank page is loading, to get rid of these.
   std::string navigation_correction_request_body;
 
+  // Track if specific buttons are included in an error page, for statistics.
+  bool reload_button_in_page;
+  bool load_stale_button_in_page;
+
   // True if a page has completed loading, at which point it can receive
   // updates.
   bool is_finished_loading;
 };
 
 bool NetErrorHelperCore::IsReloadableError(
     const NetErrorHelperCore::ErrorPageInfo& info) {
   return info.error.domain.utf8() == net::kErrorDomain &&
          info.error.reason != net::ERR_ABORTED &&
          !info.was_failed_post;
 }
 
 NetErrorHelperCore::NetErrorHelperCore(Delegate* delegate)
     : delegate_(delegate),
       last_probe_status_(chrome_common_net::DNS_PROBE_POSSIBLE),
       auto_reload_enabled_(false),
       auto_reload_timer_(new base::Timer(false, false)),
       // TODO(ellyjones): Make online_ accurate at object creation.
       online_(true),
       auto_reload_count_(0),
-      can_auto_reload_page_(false) {
+      can_auto_reload_page_(false),
+      navigation_from_button_(NO_BUTTON) {
 }
 
 NetErrorHelperCore::~NetErrorHelperCore() {
   if (committed_error_page_info_ && can_auto_reload_page_) {
     UMA_HISTOGRAM_CUSTOM_ENUMERATION("Net.AutoReload.ErrorAtStop",
                                      -committed_error_page_info_->error.reason,
                                      net::GetAllErrorCodesForUma());
     UMA_HISTOGRAM_COUNTS("Net.AutoReload.CountAtStop", auto_reload_count_);
   }
 }
@@ skipping 37 matching lines @@
   } else {
     // If an error load is starting, the resulting error page is autoreloadable.
     can_auto_reload_page_ = IsReloadableError(*pending_error_page_info_);
   }
 }
 
 void NetErrorHelperCore::OnCommitLoad(FrameType frame_type) {
   if (frame_type != MAIN_FRAME)
     return;
 
+  // Track if an error occurred due to a page button press.
+  // This isn't perfect; if (for instance), the server is slow responding
+  // to a request generated from the page reload button, and the user hits
+  // the browser reload button, this code will still believe the
+  // result is from the page reload button.
+  if (committed_error_page_info_ && pending_error_page_info_ &&
+      navigation_from_button_ != NO_BUTTON &&
+      committed_error_page_info_->error.unreachableURL ==
+          pending_error_page_info_->error.unreachableURL) {
+    DCHECK(navigation_from_button_ == RELOAD_BUTTON ||
+           navigation_from_button_ == LOAD_STALE_BUTTON);
+    chrome_common_net::RecordEvent(
+        navigation_from_button_ == RELOAD_BUTTON ?
+            chrome_common_net::NET_ERROR_PAGE_RELOAD_BUTTON_ERROR :
+            chrome_common_net::NET_ERROR_PAGE_LOAD_STALE_BUTTON_ERROR);
+  }
+  navigation_from_button_ = NO_BUTTON;
+
   if (committed_error_page_info_ && !pending_error_page_info_ &&
       can_auto_reload_page_) {
     int reason = committed_error_page_info_->error.reason;
     UMA_HISTOGRAM_CUSTOM_ENUMERATION("Net.AutoReload.ErrorAtSuccess",
                                      -reason,
                                      net::GetAllErrorCodesForUma());
     UMA_HISTOGRAM_COUNTS("Net.AutoReload.CountAtSuccess", auto_reload_count_);
     if (auto_reload_count_ == 1) {
       UMA_HISTOGRAM_CUSTOM_ENUMERATION("Net.AutoReload.ErrorAtFirstSuccess",
                                        -reason,
                                        net::GetAllErrorCodesForUma());
     }
   }
 
   committed_error_page_info_.reset(pending_error_page_info_.release());
 }
 
 void NetErrorHelperCore::OnFinishLoad(FrameType frame_type) {
   if (frame_type != MAIN_FRAME)
     return;
 
   if (!committed_error_page_info_) {
     auto_reload_count_ = 0;
     return;
   }
 
   committed_error_page_info_->is_finished_loading = true;
 
-  // Only enable stale cache JS bindings if this wasn't a post.
-  if (!committed_error_page_info_->was_failed_post) {
-    delegate_->EnableStaleLoadBindings(
-        committed_error_page_info_->error.unreachableURL);
+  chrome_common_net::RecordEvent(chrome_common_net::NET_ERROR_PAGE_SHOWN);
+  if (committed_error_page_info_->reload_button_in_page) {
+    chrome_common_net::RecordEvent(
+        chrome_common_net::NET_ERROR_PAGE_RELOAD_BUTTON_SHOWN);
   }
+  if (committed_error_page_info_->load_stale_button_in_page) {
+    chrome_common_net::RecordEvent(
+        chrome_common_net::NET_ERROR_PAGE_LOAD_STALE_BUTTON_SHOWN);
+  }
+
+  delegate_->EnablePageHelperFunctions();
 
   if (committed_error_page_info_->navigation_correction_url.is_valid()) {
     // If there is another pending error page load, |fix_url| should have been
     // cleared.
     DCHECK(!pending_error_page_info_);
     DCHECK(!committed_error_page_info_->needs_dns_updates);
     delegate_->FetchNavigationCorrections(
         committed_error_page_info_->navigation_correction_url,
         committed_error_page_info_->navigation_correction_request_body);
   } else if (auto_reload_enabled_ &&
@@ skipping 57 matching lines @@
     pending_error_page_info_.reset(new ErrorPageInfo(error, is_failed_post));
     // Skip DNS logic if suggestions were received from a remote server.
     if (IsDnsError(error) && !params) {
       // This is not strictly necessary, but waiting for a new status to be
       // sent as a result of the DidFinishLoading call keeps the histograms
       // consistent with older versions of the code, at no real cost.
       last_probe_status_ = chrome_common_net::DNS_PROBE_POSSIBLE;
 
       delegate_->GenerateLocalizedErrorPage(
           GetUpdatedError(error), is_failed_post, params.Pass(),
+          &pending_error_page_info_->reload_button_in_page,
+          &pending_error_page_info_->load_stale_button_in_page,
           error_html);
       pending_error_page_info_->needs_dns_updates = true;
       return;
     }
   }
 
-  delegate_->GenerateLocalizedErrorPage(error, is_failed_post,
-                                        params.Pass(), error_html);
+  bool reload_button_in_page = false;
+  bool load_stale_button_in_page = false;
+  delegate_->GenerateLocalizedErrorPage(
+      error, is_failed_post, params.Pass(),
+      &reload_button_in_page, &load_stale_button_in_page, error_html);
+  if (pending_error_page_info_) {
+    pending_error_page_info_->reload_button_in_page = reload_button_in_page;
+    pending_error_page_info_->load_stale_button_in_page =
+        load_stale_button_in_page;
+  }
 }
 
 void NetErrorHelperCore::OnNetErrorInfo(
     chrome_common_net::DnsProbeStatus status) {
   DCHECK_NE(chrome_common_net::DNS_PROBE_POSSIBLE, status);
 
   last_probe_status_ = status;
 
   if (!committed_error_page_info_ ||
       !committed_error_page_info_->needs_dns_updates ||
@@ skipping 24 matching lines @@
 
   UMA_HISTOGRAM_ENUMERATION("DnsProbe.ErrorPageUpdateStatus",
                             last_probe_status_,
                             chrome_common_net::DNS_PROBE_MAX);
   // Every status other than DNS_PROBE_POSSIBLE and DNS_PROBE_STARTED is a
   // final status code.  Once one is reached, the page does not need further
   // updates.
   if (last_probe_status_ != chrome_common_net::DNS_PROBE_STARTED)
     committed_error_page_info_->needs_dns_updates = false;
 
+  // There is no need to worry about the button display statistics here because
+  // the presentation of the reload and load stale buttons can't be changed
+  // by a DNS error update.
   delegate_->UpdateErrorPage(
       GetUpdatedError(committed_error_page_info_->error),
       committed_error_page_info_->was_failed_post);
 }
 
 void NetErrorHelperCore::OnNavigationCorrectionsFetched(
     const std::string& corrections,
     const std::string& accept_languages,
     bool is_rtl) {
   // Loading suggestions only starts when a blank error page finishes loading,
@@ skipping 112 matching lines @@
   if (error_url != url)
     return false;
 
   // The first iteration of the timer is started by OnFinishLoad calling
   // MaybeStartAutoReloadTimer, but since error pages for subsequent loads are
   // suppressed in this function, subsequent iterations of the timer have to be
   // started here.
   MaybeStartAutoReloadTimer();
   return true;
 }
+
+void NetErrorHelperCore::ExecuteButtonPress(Button button) {
+  switch (button) {
+    case RELOAD_BUTTON:
+      chrome_common_net::RecordEvent(
+          chrome_common_net::NET_ERROR_PAGE_RELOAD_BUTTON_CLICKED);
+      navigation_from_button_ = RELOAD_BUTTON;
+      Reload();
+      return;
+    case LOAD_STALE_BUTTON:
+      chrome_common_net::RecordEvent(
+          chrome_common_net::NET_ERROR_PAGE_LOAD_STALE_BUTTON_CLICKED);
+      navigation_from_button_ = LOAD_STALE_BUTTON;
+      delegate_->LoadPageFromCache(
+          committed_error_page_info_->error.unreachableURL);
+      return;
+    case MORE_BUTTON:
+      // Visual effects on page are handled in Javascript code.
+      chrome_common_net::RecordEvent(
+          chrome_common_net::NET_ERROR_PAGE_MORE_BUTTON_CLICKED);
+      return;
+    case NO_BUTTON:
+      NOTREACHED();
+      return;
+  }
+}
+