1 // Copyright (c) 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. 4 5 #ifndef CHROME_RENDERER_NET_NET_ERROR_HELPER_H_ 6 #define CHROME_RENDERER_NET_NET_ERROR_HELPER_H_ 7 8 #include <string> 9 10 #include "chrome/common/net/net_error_info.h" 11 #include "content/public/renderer/render_view_observer.h" 12 #include "third_party/WebKit/public/platform/WebURLError.h" 13 14 namespace base { 15 class DictionaryValue; 16 } 17 18 namespace WebKit { 19 class WebFrame; 20 } 21 22 // Listens for NetErrorInfo messages from the NetErrorTabHelper on the 23 // browser side and updates the error page with more details (currently, just 24 // DNS probe results) if/when available. 25 class NetErrorHelper : public content::RenderViewObserver { 26 public: 27 explicit NetErrorHelper(content::RenderView* render_view); 28 virtual ~NetErrorHelper(); 29 30 // RenderViewObserver implementation. 31 virtual void DidStartProvisionalLoad(WebKit::WebFrame* frame) OVERRIDE; 32 virtual void DidFailProvisionalLoad( 33 WebKit::WebFrame* frame, 34 const WebKit::WebURLError& error) OVERRIDE; 35 virtual void DidCommitProvisionalLoad( 36 WebKit::WebFrame* frame, 37 bool is_new_navigation) OVERRIDE; 38 virtual void DidFinishLoad(WebKit::WebFrame* frame) OVERRIDE; 39 40 // IPC::Listener implementation. 41 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; 42 43 // Examines |frame| and |error| to see if this is an error worthy of a DNS 44 // probe. If it is, initializes |error_strings| based on |error|, 45 // |is_failed_post|, and |locale| with suitable strings and returns true. 46 // If not, returns false, in which case the caller should look up error 47 // strings directly using LocalizedError::GetNavigationErrorStrings. 48 static bool GetErrorStringsForDnsProbe( 49 WebKit::WebFrame* frame, 50 const WebKit::WebURLError& error, 51 bool is_failed_post, 52 const std::string& locale, 53 base::DictionaryValue* error_strings); 54 55 protected: 56 // These methods handle tracking the actual state of the page; this allows 57 // unit-testing of the state tracking without having to mock out WebFrames 58 // and such. 59 void OnStartLoad(bool is_main_frame, bool is_error_page); 60 void OnFailLoad(bool is_main_frame, bool is_dns_error); 61 void OnCommitLoad(bool is_main_frame); 62 void OnFinishLoad(bool is_main_frame); 63 64 void OnNetErrorInfo(int status); 65 66 // |UpdateErrorPage| is virtual so it can be mocked out in the unittest. 67 virtual void UpdateErrorPage(); 68 69 // The last DnsProbeStatus received from the browser. 70 chrome_common_net::DnsProbeStatus last_probe_status_; 71 72 private: 73 WebKit::WebURLError GetUpdatedError() const; 74 75 // Whether the last provisional load started was for an error page. 76 bool last_start_was_error_page_; 77 78 // Whether the last provisional load failure failed with a DNS error. 79 bool last_fail_was_dns_error_; 80 81 // Ideally, this would be simply "last_commit_was_dns_error_page_". 82 // 83 // Unfortunately, that breaks if two DNS errors occur in a row; after the 84 // second failure, but before the second page commits, the helper can receive 85 // probe results. If all it knows is that the last commit was a DNS error 86 // page, it will cheerfully forward the results for the second probe to the 87 // first page. 88 // 89 // Thus, the semantics of this flag are a little weird. It is set whenever 90 // a DNS error page commits, and cleared whenever any other page commits, 91 // but it is also cleared whenever a DNS error occurs, to prevent the race 92 // described above. 93 bool forwarding_probe_results_; 94 95 // The last main frame error seen by the helper. 96 WebKit::WebURLError last_error_; 97 98 bool is_failed_post_; 99 }; 100 101 #endif // CHROME_RENDERER_NET_NET_ERROR_HELPER_H_ 102
