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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 #include "content/browser/loader/offline_policy.h" | |
6 | |
7 #include "base/command_line.h" | |
8 #include "content/public/common/content_switches.h" | |
9 #include "net/base/load_flags.h" | |
10 #include "net/http/http_response_info.h" | |
11 #include "net/url_request/url_request.h" | |
12 | |
13 namespace content { | |
14 | |
15 OfflinePolicy::OfflinePolicy() | |
16 : enabled_(CommandLine::ForCurrentProcess()->HasSwitch( | |
17 switches::kEnableOfflineCacheAccess)), | |
darin (slow to review)
2013/04/18 05:03:02
nit: 4 space indent for line continuations
Randy Smith (Not in Mondays)
2013/04/18 20:04:57
Um ... done, but I'll note that I'm already indent
| |
18 state_(INIT) {} | |
19 | |
20 OfflinePolicy::~OfflinePolicy() {} | |
21 | |
22 int OfflinePolicy::GetAdditionalLoadFlags( | |
darin (slow to review)
2013/04/18 05:03:02
nit: style guide suggests this formatting:
int Of
Randy Smith (Not in Mondays)
2013/04/18 20:04:57
Done.
| |
23 int current_flags, bool reset_state) { | |
24 | |
25 // Don't do anything if offline mode is disabled. | |
26 if (!enabled_) | |
27 return 0; | |
28 | |
29 if (reset_state) | |
30 state_ = INIT; | |
31 | |
32 // If a consumer has requested something contradictory, it wins; we | |
33 // don't modify the load flags. | |
34 if (current_flags & | |
35 (net::LOAD_BYPASS_CACHE | net::LOAD_PREFERRING_CACHE | | |
36 net::LOAD_ONLY_FROM_CACHE | net::LOAD_FROM_CACHE_IF_OFFLINE | | |
37 net::LOAD_DISABLE_CACHE)) { | |
38 return 0; | |
39 } | |
40 | |
41 switch(state_) { | |
42 case INIT: | |
43 return net::LOAD_FROM_CACHE_IF_OFFLINE; | |
44 case ONLINE: | |
45 return 0; | |
46 case OFFLINE: | |
47 return net::LOAD_ONLY_FROM_CACHE; | |
48 } | |
49 NOTREACHED(); | |
50 return 0; | |
51 } | |
52 | |
53 void OfflinePolicy::UpdateStateForCompletedRequest( | |
54 const net::HttpResponseInfo& response_info) { | |
55 // Don't do anything if offline mode is disabled. | |
56 if (!enabled_) | |
57 return; | |
58 | |
59 if (state_ != INIT) | |
60 // We've already made the decision for the rest of this set | |
61 // of navigations. | |
62 return; | |
63 | |
64 if (response_info.server_data_unavailable) { | |
65 state_ = OFFLINE; | |
66 } else if (response_info.network_accessed) { | |
67 // If we got the response from the network or validated it as part | |
68 // of this request, that means our connection to the host is working. | |
69 state_ = ONLINE; | |
70 } | |
71 } | |
72 | |
73 } // namespace content | |
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