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.
5 #ifndef CHROME_RENDERER_NET_NET_ERROR_HELPER_H_
6 #define CHROME_RENDERER_NET_NET_ERROR_HELPER_H_
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"
15 class DictionaryValue;
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 {
27 explicit NetErrorHelper(content::RenderView* render_view);
28 virtual ~NetErrorHelper();
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;
40 // IPC::Listener implementation.
41 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
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,
52 const std::string& locale,
53 const std::string& accept_languages,
54 base::DictionaryValue* error_strings);
57 // These methods handle tracking the actual state of the page; this allows
58 // unit-testing of the state tracking without having to mock out WebFrames
60 void OnStartLoad(bool is_main_frame, bool is_error_page);
61 void OnFailLoad(bool is_main_frame, bool is_dns_error);
62 void OnCommitLoad(bool is_main_frame);
63 void OnFinishLoad(bool is_main_frame);
65 void OnNetErrorInfo(int status);
67 // |UpdateErrorPage| is virtual so it can be mocked out in the unittest.
68 virtual void UpdateErrorPage();
70 // The last DnsProbeStatus received from the browser.
71 chrome_common_net::DnsProbeStatus last_probe_status_;
74 WebKit::WebURLError GetUpdatedError() const;
76 // Whether the last provisional load started was for an error page.
77 bool last_start_was_error_page_;
79 // Whether the last provisional load failure failed with a DNS error.
80 bool last_fail_was_dns_error_;
82 // Ideally, this would be simply "last_commit_was_dns_error_page_".
84 // Unfortunately, that breaks if two DNS errors occur in a row; after the
85 // second failure, but before the second page commits, the helper can receive
86 // probe results. If all it knows is that the last commit was a DNS error
87 // page, it will cheerfully forward the results for the second probe to the
90 // Thus, the semantics of this flag are a little weird. It is set whenever
91 // a DNS error page commits, and cleared whenever any other page commits,
92 // but it is also cleared whenever a DNS error occurs, to prevent the race
94 bool forwarding_probe_results_;
96 // The last main frame error seen by the helper.
97 WebKit::WebURLError last_error_;
102 #endif // CHROME_RENDERER_NET_NET_ERROR_HELPER_H_