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1 // Copyright 2015 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/async_revalidation_manager.h" | |
6 | |
7 #include <utility> | |
8 | |
9 #include "base/logging.h" | |
10 #include "content/browser/loader/async_revalidation_driver.h" | |
11 #include "content/browser/loader/resource_message_filter.h" | |
12 #include "content/browser/loader/resource_request_info_impl.h" | |
13 #include "content/browser/loader/resource_scheduler.h" | |
14 #include "content/common/resource_messages.h" | |
15 #include "content/public/browser/resource_throttle.h" | |
16 #include "net/base/load_flags.h" | |
17 #include "net/http/http_transaction_factory.h" | |
18 #include "net/http/http_util.h" | |
19 #include "net/url_request/url_request.h" | |
20 #include "net/url_request/url_request_context.h" | |
21 #include "url/gurl.h" | |
22 | |
23 namespace content { | |
24 | |
25 AsyncRevalidationManager::AsyncRevalidationKey::AsyncRevalidationKey( | |
26 const ResourceContext* resource_context, | |
27 const net::HttpCache* http_cache, | |
28 const GURL& url) | |
29 : resource_context(resource_context), | |
30 http_cache(http_cache), | |
31 url_key(net::HttpUtil::SpecForRequest(url)) {} | |
32 | |
33 AsyncRevalidationManager::AsyncRevalidationKey::AsyncRevalidationKey( | |
34 const ResourceContext* resource_context) | |
35 : resource_context(resource_context), http_cache(nullptr), url_key() {} | |
36 | |
37 AsyncRevalidationManager::AsyncRevalidationKey::~AsyncRevalidationKey() {} | |
38 | |
39 bool AsyncRevalidationManager::AsyncRevalidationKey::LessThan::operator()( | |
40 const AsyncRevalidationKey& lhs, | |
41 const AsyncRevalidationKey& rhs) const { | |
42 if (lhs.resource_context != rhs.resource_context) | |
43 return lhs.resource_context < rhs.resource_context; | |
44 | |
45 if (lhs.http_cache != rhs.http_cache) | |
46 return lhs.http_cache < rhs.http_cache; | |
47 | |
48 return lhs.url_key < rhs.url_key; | |
kinuko
2015/11/19 07:00:29
nit: I think now you could do
return std::tie(lhs
Adam Rice
2015/11/19 21:13:52
Done.
| |
49 } | |
50 | |
51 AsyncRevalidationManager::AsyncRevalidationManager() {} | |
52 | |
53 AsyncRevalidationManager::~AsyncRevalidationManager() { | |
54 DCHECK(in_progress_.empty()); | |
55 } | |
56 | |
57 void AsyncRevalidationManager::BeginAsyncRevalidation( | |
58 net::URLRequest* for_request, | |
59 ResourceScheduler* scheduler) { | |
60 DCHECK_EQ(for_request->url_chain().size(), 1u); | |
61 ResourceRequestInfoImpl* info = | |
62 ResourceRequestInfoImpl::ForRequest(for_request); | |
63 DCHECK(info); | |
64 if (!info->filter()) { | |
65 // The child has gone away. Since it never received the body of the stale | |
66 // resource, it is okay not to perform an async revalidation. | |
67 return; | |
68 } | |
69 | |
70 int child_id = info->GetChildID(); | |
71 int route_id = info->GetRouteID(); | |
72 | |
73 // ResourceMsgFilter::GetContexts requires a ResourceHostMsg_Request object be | |
74 // passed but only cares about the resource_type field. | |
75 ResourceHostMsg_Request dummy_resource_host_msg_request; | |
76 dummy_resource_host_msg_request.resource_type = info->GetResourceType(); | |
77 ResourceContext* resource_context = nullptr; | |
78 net::URLRequestContext* request_context = nullptr; | |
79 | |
80 // This |request_context| needs to be valid until | |
81 // RemoveResourceContext(resource_context) is called. This is currently | |
82 // correct, see the comment about member variable ordering in | |
83 // //chrome/browser/profiles/profile_io_data.h. | |
84 info->filter()->GetContexts(dummy_resource_host_msg_request, | |
85 &resource_context, &request_context); | |
86 | |
87 AsyncRevalidationKey async_revalidation_key( | |
88 resource_context, request_context->http_transaction_factory()->GetCache(), | |
89 for_request->url()); | |
90 std::pair<AsyncRevalidationMap::iterator, bool> insert_result = | |
91 in_progress_.insert( | |
92 AsyncRevalidationMap::value_type(async_revalidation_key, nullptr)); | |
93 if (!insert_result.second) { | |
94 // A matching async revalidation is already in progress for this cache; we | |
95 // don't need another one. | |
96 return; | |
97 } | |
98 auto& async_revalidation = insert_result.first->second; | |
99 DCHECK(async_revalidation == nullptr); | |
100 | |
101 net::HttpRequestHeaders headers; | |
102 headers.AddHeadersFromString(info->original_headers()); | |
103 | |
104 // Construct the request. | |
105 scoped_ptr<net::URLRequest> new_request = request_context->CreateRequest( | |
106 for_request->url(), net::MINIMUM_PRIORITY, nullptr); | |
107 | |
108 new_request->set_method(for_request->method()); | |
109 new_request->set_first_party_for_cookies( | |
110 for_request->first_party_for_cookies()); | |
111 new_request->set_first_party_url_policy( | |
112 for_request->first_party_url_policy()); | |
113 | |
114 new_request->SetReferrer(for_request->referrer()); | |
115 new_request->set_referrer_policy(for_request->referrer_policy()); | |
116 | |
117 new_request->SetExtraRequestHeaders(headers); | |
118 | |
119 int load_flags = for_request->load_flags() & | |
120 ~net::LOAD_SUPPORT_ASYNC_REVALIDATION & | |
121 ~net::LOAD_MAIN_FRAME; | |
122 DCHECK_EQ(load_flags & net::LOAD_IGNORE_LIMITS, 0); | |
123 new_request->SetLoadFlags(load_flags); | |
124 | |
125 scoped_ptr<ResourceThrottle> throttle = | |
126 scheduler->ScheduleRequest(child_id, route_id, false, new_request.get()); | |
127 // This use of base::Unretained() is safe because the AsyncRevalidatonDriver | |
128 // object will be destroyed before this object is. The use of the raw iterator | |
129 // is safe because objects are only erased from the map after being deleted, | |
130 // and a deleted AsyncRevalidationDriver will not call the completion | |
131 // callback. | |
132 async_revalidation = new AsyncRevalidationDriver( | |
kinuko
2015/11/19 08:38:34
Hmm it's slightly hard to follow that this is actu
Adam Rice
2015/11/19 21:13:52
Done.
| |
133 new_request.Pass(), throttle.Pass(), | |
134 base::Bind(&AsyncRevalidationManager::OnAsyncRevalidationComplete, | |
135 base::Unretained(this), insert_result.first)); | |
136 async_revalidation->StartRequest(); | |
137 } | |
138 | |
139 void AsyncRevalidationManager::CancelAsyncRevalidationsForResourceContext( | |
140 ResourceContext* resource_context) { | |
141 // For this algorithm to work, elements using |resource_context| must be | |
142 // contiguous in the map (ie. it must form the first part of the key). | |
143 AsyncRevalidationKey partial_key(resource_context); | |
144 for (auto it = in_progress_.lower_bound(partial_key); | |
145 it != in_progress_.end() && | |
146 it->first.resource_context == resource_context;) { | |
147 // It is necessary to delete behind the iterator because an iterator can't | |
148 // be incremented once it has been removed from the map. | |
149 auto prev_it = it; | |
150 ++it; | |
151 prev_it->second->CancelRequest(); | |
152 delete prev_it->second; | |
153 in_progress_.erase(prev_it); | |
154 } | |
155 } | |
156 | |
157 bool AsyncRevalidationManager::QualifiesForAsyncRevalidation( | |
158 const ResourceHostMsg_Request& request) { | |
159 if (request.load_flags & | |
160 (net::LOAD_BYPASS_CACHE | net::LOAD_DISABLE_CACHE | | |
161 net::LOAD_VALIDATE_CACHE | net::LOAD_PREFERRING_CACHE | | |
162 net::LOAD_ONLY_FROM_CACHE | net::LOAD_IGNORE_LIMITS)) { | |
163 return false; | |
164 } | |
165 if (request.method != "GET") | |
166 return false; | |
167 // A GET request should not have a body, but don't leave it to chance. | |
168 if (request.request_body.get()) | |
169 return false; | |
170 if (!request.url.SchemeIsHTTPOrHTTPS()) | |
171 return false; | |
172 | |
173 return true; | |
174 } | |
175 | |
176 void AsyncRevalidationManager::OnAsyncRevalidationComplete( | |
177 AsyncRevalidationMap::iterator it) { | |
178 delete it->second; | |
179 in_progress_.erase(it); | |
180 } | |
181 | |
182 } // namespace content | |
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