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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 CHROME_BROWSER_NET_RESOLVE_PROXY_MSG_HELPER_H_
#define CHROME_BROWSER_NET_RESOLVE_PROXY_MSG_HELPER_H_
#pragma once
#include <deque>
#include <string>
#include "base/ref_counted.h"
#include "googleurl/src/gurl.h"
#include "ipc/ipc_message.h"
#include "net/base/completion_callback.h"
#include "net/proxy/proxy_service.h"
// This class holds the common logic used to respond to the messages:
// {PluginProcessHostMsg_ResolveProxy, ViewHostMsg_ResolveProxy}.
//
// This involves kicking off a ProxyResolve request on the IO thread using
// the specified proxy service.
//
// When the request completes, it calls the delegate's OnProxyResolveCompleted()
// method, passing it the result (error code + proxy list), as well as the
// IPC::Message pointer that had been stored.
//
// 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:
class Delegate {
public:
// Callback for when the proxy resolve request has completed.
// |reply_msg| -- The same pointer that the request was started with.
// |result| -- The network error code from ProxyService.
// |proxy_list| -- The PAC string result from ProxyService.
virtual void OnResolveProxyCompleted(IPC::Message* reply_msg,
int result,
const std::string& proxy_list) = 0;
virtual ~Delegate() {}
};
// Constructs a ResolveProxyMsgHelper instance that notifies request
// completion to |delegate|. Note that |delegate| must be live throughout
// our lifespan. If |proxy_service| is NULL, then the current profile's
// proxy service will be used.
ResolveProxyMsgHelper(Delegate* delegate, net::ProxyService* proxy_service);
// Resolves proxies for |url|. 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.
void Start(const GURL& url, IPC::Message* reply_msg);
// Destruction cancels the current outstanding request, and clears the
// pending queue.
~ResolveProxyMsgHelper();
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(scoped_refptr<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.
scoped_refptr<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_;
Delegate* delegate_;
// Specified by unit-tests, to use this proxy service in place of the
// global one.
scoped_refptr<net::ProxyService> proxy_service_override_;
};
#endif // CHROME_BROWSER_NET_RESOLVE_PROXY_MSG_HELPER_H_
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