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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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