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// Copyright (c) 2009 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 <string>
#include "base/scoped_ptr.h"
#include "net/proxy/proxy_resolver.h"
class MessageLoop;
namespace net {
class HostResolver;
// 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 beween 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 ProxyResolverV8 : public ProxyResolver {
public:
class JSBindings;
// Constructs a ProxyResolverV8 with custom bindings. ProxyResolverV8 takes
// ownership of |custom_js_bindings| and deletes it when ProxyResolverV8
// is destroyed.
explicit ProxyResolverV8(JSBindings* custom_js_bindings);
~ProxyResolverV8();
// ProxyResolver implementation:
virtual int GetProxyForURL(const GURL& query_url,
const GURL& /*pac_url*/,
ProxyInfo* results);
virtual void SetPacScript(const std::string& bytes);
JSBindings* js_bindings() const { return js_bindings_.get(); }
// Creates a default javascript bindings implementation that will:
// - Send script error messages to LOG(INFO)
// - Send script alert()s to LOG(INFO)
// - Use the provided host resolver to service dnsResolve().
//
// For clients that need more control (for example, sending the script output
// to a UI widget), use the ProxyResolverV8(JSBindings*) and specify your
// own bindings.
//
// |host_resolver| will be used in async mode on |host_resolver_loop|. If
// |host_resolver_loop| is NULL, then |host_resolver| will be used in sync
// mode on the PAC thread.
static JSBindings* CreateDefaultBindings(HostResolver* host_resolver,
MessageLoop* host_resolver_loop);
private:
// 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_;
scoped_ptr<JSBindings> js_bindings_;
DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8);
};
// Interface for the javascript bindings.
class ProxyResolverV8::JSBindings {
public:
virtual ~JSBindings() {}
// Handler for "alert(message)"
virtual void Alert(const std::string& message) = 0;
// Handler for "myIpAddress()". Returns empty string on failure.
virtual std::string MyIpAddress() = 0;
// Handler for "dnsResolve(host)". Returns empty string on failure.
virtual std::string DnsResolve(const std::string& host) = 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 std::string& error) = 0;
};
} // namespace net
#endif // NET_PROXY_PROXY_RESOLVER_V8_H_
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