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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 "extensions/browser/extension_api_frame_id_map.h" | |
6 | |
7 #include <list> | |
8 #include <map> | |
9 #include <tuple> | |
10 | |
11 #include "base/lazy_instance.h" | |
12 #include "content/public/browser/browser_thread.h" | |
13 #include "content/public/browser/render_frame_host.h" | |
14 #include "content/public/browser/render_process_host.h" | |
15 #include "content/public/browser/web_contents.h" | |
16 | |
17 namespace extensions { | |
18 | |
19 namespace { | |
20 | |
21 struct RenderFrameIdKey; | |
22 typedef std::list<ExtensionApiFrameIdMap::FrameIdCallback> FrameIdCallbackList; | |
23 typedef std::map<RenderFrameIdKey, ExtensionApiFrameId> FrameIdMap; | |
24 typedef std::map<RenderFrameIdKey, FrameIdCallbackList> CallbackMap; | |
25 | |
26 // Queued callbacks for use on the IO thread. This queue is only used when the | |
27 // frameId needs to be fetched from the UI thread. | |
28 base::LazyInstance<CallbackMap> g_callbacks_map = LAZY_INSTANCE_INITIALIZER; | |
29 | |
30 // This frameId map is only modified on the UI thread and used for two purposes: | |
31 // - On the IO thread, it avoids unnecessary thread hops. | |
32 // - On the UI thread and the IO thread, it ensures that the frameId remains | |
33 // constant, even after removing a frame. | |
34 // Items are never removed from this map. | |
35 base::LazyInstance<FrameIdMap> g_frame_id_map = LAZY_INSTANCE_INITIALIZER; | |
nasko
2015/12/09 23:06:09
Why is this map needed and must grow unbound? Why
robwu
2015/12/10 00:00:51
Because I think that there is no guarantee that al
nasko
2015/12/17 01:19:48
There should be no events for webNavigation after
| |
36 | |
37 // A set of identifiers that uniquely identifies a RenderFrame. | |
38 struct RenderFrameIdKey { | |
39 RenderFrameIdKey(int process_id, int routing_id) | |
nasko
2015/12/09 23:06:09
nit: frame_routing_id
robwu
2015/12/10 00:00:51
Done. (everywhere, and also changed process_id to
| |
40 : process_id(process_id), routing_id(routing_id) {} | |
41 | |
42 // The process ID of the renderer that contains the RenderFrame. | |
43 int process_id; | |
44 // The routing ID of the RenderFrame. | |
45 int routing_id; | |
46 | |
47 bool operator<(const RenderFrameIdKey& other) const { | |
48 return std::tie(process_id, routing_id) < | |
49 std::tie(other.process_id, other.routing_id); | |
50 } | |
51 }; | |
52 | |
53 } // namespace | |
54 | |
55 ExtensionApiFrameId::ExtensionApiFrameId() | |
56 : frame_id(kInvalidFrameId), parent_frame_id(kInvalidFrameId) {} | |
57 | |
58 int GetFrameIdFromFrame(content::RenderFrameHost* rfh) { | |
59 if (!rfh) | |
60 return ExtensionApiFrameId::kInvalidFrameId; | |
61 if (rfh->GetParent()) | |
62 return rfh->GetFrameTreeNodeID(); | |
63 return 0; // Main frame. | |
64 } | |
65 | |
66 void InitializeFromFrame(ExtensionApiFrameId& extension_api_frame_id, | |
67 content::RenderFrameHost* rfh) { | |
68 if (rfh) { | |
nasko
2015/12/09 23:06:09
We usually use early returns. Example pattern:
if
robwu
2015/12/10 00:00:51
Done.
| |
69 extension_api_frame_id.frame_id = GetFrameIdFromFrame(rfh); | |
70 extension_api_frame_id.parent_frame_id = | |
71 GetFrameIdFromFrame(rfh->GetParent()); | |
72 } | |
73 } | |
74 | |
75 const ExtensionApiFrameId& LookupFrameIdOnUI(const RenderFrameIdKey& key) { | |
76 DCHECK_CURRENTLY_ON(content::BrowserThread::UI); | |
77 | |
78 FrameIdMap& frame_id_map = g_frame_id_map.Get(); | |
79 FrameIdMap::const_iterator frame_id_iter = frame_id_map.find(key); | |
80 if (frame_id_iter != frame_id_map.end()) | |
81 return frame_id_iter->second; | |
82 | |
83 ExtensionApiFrameId& extension_api_frame_id = frame_id_map[key]; | |
84 InitializeFromFrame( | |
85 extension_api_frame_id, | |
86 content::RenderFrameHost::FromID(key.process_id, key.routing_id)); | |
87 return extension_api_frame_id; | |
88 } | |
89 | |
90 void GotFrameId(const RenderFrameIdKey& key) { | |
91 DCHECK_CURRENTLY_ON(content::BrowserThread::IO); | |
92 | |
93 FrameIdMap& frame_id_map = g_frame_id_map.Get(); | |
94 FrameIdMap::const_iterator frame_id_iter = frame_id_map.find(key); | |
95 CHECK(frame_id_iter != frame_id_map.end()); | |
96 | |
97 const ExtensionApiFrameId& extension_api_frame_id = frame_id_iter->second; | |
98 CallbackMap& callbacks_map = g_callbacks_map.Get(); | |
99 FrameIdCallbackList& callbacks = callbacks_map[key]; | |
100 // If GetFrameIdOnIO is called in one of the callbacks, another callback is | |
101 // appended to the list. So we cannot use a fancy range-based for loop. | |
102 for (FrameIdCallbackList::iterator it = callbacks.begin(); | |
103 it != callbacks.end(); ++it) { | |
104 it->Run(extension_api_frame_id); | |
105 } | |
106 | |
107 // Remove the callback list. Because the extension frame ID is cached, this | |
108 // list is never created again for |key|. | |
109 callbacks_map.erase(key); | |
110 } | |
111 | |
112 void ExtensionApiFrameIdMap::GetFrameIdOnIO(int process_id, | |
113 int routing_id, | |
114 FrameIdCallback callback) { | |
115 DCHECK_CURRENTLY_ON(content::BrowserThread::IO); | |
116 | |
117 const RenderFrameIdKey key(process_id, routing_id); | |
118 CallbackMap& callbacks_map = g_callbacks_map.Get(); | |
119 CallbackMap::iterator callbacks_iter = callbacks_map.find(key); | |
120 if (callbacks_iter != callbacks_map.end()) { | |
121 // There is a pending lookup for the extension frame ID. | |
122 callbacks_iter->second.push_back(callback); | |
123 return; | |
124 } | |
125 | |
126 FrameIdMap& frame_id_map = g_frame_id_map.Get(); | |
127 FrameIdMap::const_iterator frame_id_iter = frame_id_map.find(key); | |
128 if (frame_id_iter != frame_id_map.end()) { | |
129 // The extension frame ID has already been looked up. | |
130 callback.Run(frame_id_iter->second); | |
131 return; | |
132 } | |
133 | |
134 // The key was seen for the first time, hop to the UI thread to look up the | |
135 // extension frame ID. | |
136 callbacks_map[key].push_back(callback); | |
137 content::BrowserThread::PostTaskAndReply( | |
138 content::BrowserThread::UI, FROM_HERE, | |
139 base::Bind(base::IgnoreResult(&LookupFrameIdOnUI), key), | |
140 base::Bind(&GotFrameId, key)); | |
141 } | |
142 | |
143 const ExtensionApiFrameId& ExtensionApiFrameIdMap::GetFrameId(int process_id, | |
144 int routing_id) { | |
145 return LookupFrameIdOnUI(RenderFrameIdKey(process_id, routing_id)); | |
146 } | |
147 | |
148 const ExtensionApiFrameId& ExtensionApiFrameIdMap::GetFrameId( | |
149 content::RenderFrameHost* rfh) { | |
150 DCHECK_CURRENTLY_ON(content::BrowserThread::UI); | |
151 | |
152 FrameIdMap& frame_id_map = g_frame_id_map.Get(); | |
153 if (!rfh) | |
154 return frame_id_map[RenderFrameIdKey(-1, -1)]; | |
155 | |
156 const RenderFrameIdKey key(rfh->GetProcess()->GetID(), rfh->GetRoutingID()); | |
157 | |
158 FrameIdMap::const_iterator frame_id_iter = frame_id_map.find(key); | |
159 if (frame_id_iter != frame_id_map.end()) | |
160 return frame_id_iter->second; | |
161 | |
162 ExtensionApiFrameId& extension_api_frame_id = frame_id_map[key]; | |
163 InitializeFromFrame(extension_api_frame_id, rfh); | |
164 return extension_api_frame_id; | |
165 } | |
166 | |
167 content::RenderFrameHost* ExtensionApiFrameIdMap::GetRenderFrameHostById( | |
168 int frame_id, | |
169 content::WebContents* web_contents) { | |
170 // Although it is technically possible to map |frame_id| to a RenderFrameHost | |
171 // without WebContents, we choose to not do that because in the extension API | |
172 // frameIds are only guaranteed to be meaningful in combination with a tabId. | |
173 if (!web_contents) | |
174 return nullptr; | |
175 | |
176 if (frame_id == 0) | |
177 return web_contents->GetMainFrame(); | |
178 | |
179 if (frame_id == -1) | |
180 return nullptr; | |
181 | |
182 DCHECK_GE(frame_id, 1); | |
183 return web_contents->FindFrameByFrameTreeNodeID(frame_id); | |
184 } | |
185 | |
186 } // namespace extensions | |
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