| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef NET_PROXY_PROXY_RESOLVER_V8_H_ |
| #define NET_PROXY_PROXY_RESOLVER_V8_H_ |
| |
| #include "base/compiler_specific.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "net/base/net_export.h" |
| #include "net/proxy/proxy_resolver.h" |
| |
| namespace v8 { |
| class HeapStatistics; |
| class Isolate; |
| } // namespace v8 |
| |
| namespace net { |
| |
| // Implementation of ProxyResolver that uses V8 to evaluate PAC scripts. |
| // |
| // ---------------------------------------------------------------------------- |
| // !!! Important note on threading model: |
| // ---------------------------------------------------------------------------- |
| // There can be only one instance of V8 running at a time. To enforce this |
| // constraint, ProxyResolverV8 holds a v8::Locker during execution. Therefore |
| // it is OK to run multiple instances of ProxyResolverV8 on different threads, |
| // since only one will be running inside V8 at a time. |
| // |
| // It is important that *ALL* instances of V8 in the process be using |
| // v8::Locker. If not there can be race conditions between the non-locked V8 |
| // instances and the locked V8 instances used by ProxyResolverV8 (assuming they |
| // run on different threads). |
| // |
| // This is the case with the V8 instance used by chromium's renderer -- it runs |
| // on a different thread from ProxyResolver (renderer thread vs PAC thread), |
| // and does not use locking since it expects to be alone. |
| class NET_EXPORT_PRIVATE ProxyResolverV8 : public ProxyResolver { |
| public: |
| // Interface for the javascript bindings. |
| class NET_EXPORT_PRIVATE JSBindings { |
| public: |
| enum ResolveDnsOperation { |
| DNS_RESOLVE, |
| DNS_RESOLVE_EX, |
| MY_IP_ADDRESS, |
| MY_IP_ADDRESS_EX, |
| }; |
| |
| JSBindings() {} |
| |
| // Handler for "dnsResolve()", "dnsResolveEx()", "myIpAddress()", |
| // "myIpAddressEx()". Returns true on success and fills |*output| with the |
| // result. If |*terminate| is set to true, then the script execution will |
| // be aborted. Note that termination may not happen right away. |
| virtual bool ResolveDns(const std::string& host, |
| ResolveDnsOperation op, |
| std::string* output, |
| bool* terminate) = 0; |
| |
| // Handler for "alert(message)" |
| virtual void Alert(const base::string16& message) = 0; |
| |
| // Handler for when an error is encountered. |line_number| may be -1 |
| // if a line number is not applicable to this error. |
| virtual void OnError(int line_number, const base::string16& error) = 0; |
| |
| protected: |
| virtual ~JSBindings() {} |
| }; |
| |
| // Constructs a ProxyResolverV8. |
| ProxyResolverV8(); |
| |
| virtual ~ProxyResolverV8(); |
| |
| JSBindings* js_bindings() const { return js_bindings_; } |
| void set_js_bindings(JSBindings* js_bindings) { js_bindings_ = js_bindings; } |
| |
| // ProxyResolver implementation: |
| virtual int GetProxyForURL(const GURL& url, |
| ProxyInfo* results, |
| const net::CompletionCallback& /*callback*/, |
| RequestHandle* /*request*/, |
| const BoundNetLog& net_log) OVERRIDE; |
| virtual void CancelRequest(RequestHandle request) OVERRIDE; |
| virtual LoadState GetLoadState(RequestHandle request) const OVERRIDE; |
| virtual void CancelSetPacScript() OVERRIDE; |
| virtual void PurgeMemory() OVERRIDE; |
| virtual int SetPacScript( |
| const scoped_refptr<ProxyResolverScriptData>& script_data, |
| const net::CompletionCallback& /*callback*/) OVERRIDE; |
| |
| // Remember the default Isolate, must be called from the main thread. This |
| // hack can be removed when the "default Isolate" concept is gone. |
| static void RememberDefaultIsolate(); |
| |
| #if defined(OS_WIN) |
| // Create an isolate to use for the proxy resolver. Until the "default |
| // Isolate" concept is gone, it is preferable to invoke |
| // RememberDefaultIsolate() as creating a new Isolate in additional to the |
| // default Isolate will waste a few MB of memory and the runtime it took to |
| // create the default Isolate. |
| static void CreateIsolate(); |
| #endif |
| |
| static v8::Isolate* GetDefaultIsolate(); |
| |
| // Get total/ued heap memory usage of all v8 instances used by the proxy |
| // resolver. |
| static size_t GetTotalHeapSize(); |
| static size_t GetUsedHeapSize(); |
| |
| private: |
| static v8::Isolate* g_default_isolate_; |
| |
| // Context holds the Javascript state for the most recently loaded PAC |
| // script. It corresponds with the data from the last call to |
| // SetPacScript(). |
| class Context; |
| |
| scoped_ptr<Context> context_; |
| |
| JSBindings* js_bindings_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8); |
| }; |
| |
| } // namespace net |
| |
| #endif // NET_PROXY_PROXY_RESOLVER_V8_H_ |