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// 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 CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_
#define CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_
#pragma once
#include <deque>
#include <string>
#include "base/memory/ref_counted.h"
#include "content/browser/browser_message_filter.h"
#include "googleurl/src/gurl.h"
#include "net/base/completion_callback.h"
#include "net/proxy/proxy_service.h"
// Responds to ChildProcessHostMsg_ResolveProxy, kicking off a ProxyResolve
// request on the IO thread using the specified proxy service. Completion is
// notified through the delegate. If multiple requests are started at the same
// time, they will run in FIFO order, with only 1 being outstanding at a time.
//
// When an instance of ResolveProxyMsgHelper is destroyed, it cancels any
// outstanding proxy resolve requests with the proxy service. It also deletes
// the stored IPC::Message pointers for pending requests.
//
// This object is expected to live on the IO thread.
class ResolveProxyMsgHelper : public BrowserMessageFilter {
public:
// If |proxy_service| is NULL, then the main profile's proxy service will
// be used.
explicit ResolveProxyMsgHelper(net::ProxyService* proxy_service);
// Destruction cancels the current outstanding request, and clears the
// pending queue.
~ResolveProxyMsgHelper();
// BrowserMessageFilter implementation
virtual bool OnMessageReceived(const IPC::Message& message,
bool* message_was_ok);
void OnResolveProxy(const GURL& url, IPC::Message* reply_msg);
private:
// Callback for the ProxyService (bound to |callback_|).
void OnResolveProxyCompleted(int result);
// Starts the first pending request.
void StartPendingRequest();
// Get the proxy service instance to use. On success returns true and
// sets |*out|. Otherwise returns false.
bool GetProxyService(net::ProxyService** out) const;
// A PendingRequest is a resolve request that is in progress, or queued.
struct PendingRequest {
public:
PendingRequest(const GURL& url, IPC::Message* reply_msg) :
url(url), reply_msg(reply_msg), pac_req(NULL) { }
// The URL of the request.
GURL url;
// Data to pass back to the delegate on completion (we own it until then).
IPC::Message* reply_msg;
// Handle for cancelling the current request if it has started (else NULL).
net::ProxyService::PacRequest* pac_req;
};
// Members for the current outstanding proxy request.
net::ProxyService* proxy_service_;
net::CompletionCallbackImpl<ResolveProxyMsgHelper> callback_;
net::ProxyInfo proxy_info_;
// FIFO queue of pending requests. The first entry is always the current one.
typedef std::deque<PendingRequest> PendingRequestList;
PendingRequestList pending_requests_;
// Specified by unit-tests, to use this proxy service in place of the
// global one.
net::ProxyService* proxy_service_override_;
};
#endif // CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_
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