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1 // Copyright (c) 2011 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 NET_PROXY_PROXY_RESOLVER_V8_H_ | |
6 #define NET_PROXY_PROXY_RESOLVER_V8_H_ | |
7 | |
8 #include "base/compiler_specific.h" | |
9 #include "base/memory/scoped_ptr.h" | |
10 #include "net/base/net_export.h" | |
11 #include "net/proxy/proxy_resolver.h" | |
12 | |
13 namespace gin { | |
14 class IsolateHolder; | |
15 } // namespace gin | |
16 | |
17 namespace v8 { | |
18 class HeapStatistics; | |
19 class Isolate; | |
20 } // namespace v8 | |
21 | |
22 namespace net { | |
23 | |
24 // Implementation of ProxyResolver that uses V8 to evaluate PAC scripts. | |
25 // | |
26 // ---------------------------------------------------------------------------- | |
27 // !!! Important note on threading model: | |
28 // ---------------------------------------------------------------------------- | |
29 // There can be only one instance of V8 running at a time. To enforce this | |
30 // constraint, ProxyResolverV8 holds a v8::Locker during execution. Therefore | |
31 // it is OK to run multiple instances of ProxyResolverV8 on different threads, | |
32 // since only one will be running inside V8 at a time. | |
33 // | |
34 // It is important that *ALL* instances of V8 in the process be using | |
35 // v8::Locker. If not there can be race conditions between the non-locked V8 | |
36 // instances and the locked V8 instances used by ProxyResolverV8 (assuming they | |
37 // run on different threads). | |
38 // | |
39 // This is the case with the V8 instance used by chromium's renderer -- it runs | |
40 // on a different thread from ProxyResolver (renderer thread vs PAC thread), | |
41 // and does not use locking since it expects to be alone. | |
42 class NET_EXPORT_PRIVATE ProxyResolverV8 : public ProxyResolver { | |
43 public: | |
44 // Interface for the javascript bindings. | |
45 class NET_EXPORT_PRIVATE JSBindings { | |
46 public: | |
47 enum ResolveDnsOperation { | |
48 DNS_RESOLVE, | |
49 DNS_RESOLVE_EX, | |
50 MY_IP_ADDRESS, | |
51 MY_IP_ADDRESS_EX, | |
52 }; | |
53 | |
54 JSBindings() {} | |
55 | |
56 // Handler for "dnsResolve()", "dnsResolveEx()", "myIpAddress()", | |
57 // "myIpAddressEx()". Returns true on success and fills |*output| with the | |
58 // result. If |*terminate| is set to true, then the script execution will | |
59 // be aborted. Note that termination may not happen right away. | |
60 virtual bool ResolveDns(const std::string& host, | |
61 ResolveDnsOperation op, | |
62 std::string* output, | |
63 bool* terminate) = 0; | |
64 | |
65 // Handler for "alert(message)" | |
66 virtual void Alert(const base::string16& message) = 0; | |
67 | |
68 // Handler for when an error is encountered. |line_number| may be -1 | |
69 // if a line number is not applicable to this error. | |
70 virtual void OnError(int line_number, const base::string16& error) = 0; | |
71 | |
72 protected: | |
73 virtual ~JSBindings() {} | |
74 }; | |
75 | |
76 // Constructs a ProxyResolverV8. | |
77 ProxyResolverV8(); | |
78 | |
79 ~ProxyResolverV8() override; | |
80 | |
81 JSBindings* js_bindings() const { return js_bindings_; } | |
82 void set_js_bindings(JSBindings* js_bindings) { js_bindings_ = js_bindings; } | |
83 | |
84 // ProxyResolver implementation: | |
85 int GetProxyForURL(const GURL& url, | |
86 ProxyInfo* results, | |
87 const net::CompletionCallback& /*callback*/, | |
88 RequestHandle* /*request*/, | |
89 const BoundNetLog& net_log) override; | |
90 void CancelRequest(RequestHandle request) override; | |
91 LoadState GetLoadState(RequestHandle request) const override; | |
92 void CancelSetPacScript() override; | |
93 int SetPacScript(const scoped_refptr<ProxyResolverScriptData>& script_data, | |
94 const net::CompletionCallback& /*callback*/) override; | |
95 | |
96 // Create an isolate to use for the proxy resolver. If the embedder invokes | |
97 // this method multiple times, it must be invoked in a thread safe manner, | |
98 // e.g. always from the same thread. | |
99 static void EnsureIsolateCreated(); | |
100 | |
101 static v8::Isolate* GetDefaultIsolate(); | |
102 | |
103 // Get total/ued heap memory usage of all v8 instances used by the proxy | |
104 // resolver. | |
105 static size_t GetTotalHeapSize(); | |
106 static size_t GetUsedHeapSize(); | |
107 | |
108 private: | |
109 static gin::IsolateHolder* g_proxy_resolver_isolate_; | |
110 | |
111 // Context holds the Javascript state for the most recently loaded PAC | |
112 // script. It corresponds with the data from the last call to | |
113 // SetPacScript(). | |
114 class Context; | |
115 | |
116 scoped_ptr<Context> context_; | |
117 | |
118 JSBindings* js_bindings_; | |
119 | |
120 DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8); | |
121 }; | |
122 | |
123 } // namespace net | |
124 | |
125 #endif // NET_PROXY_PROXY_RESOLVER_V8_H_ | |
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