Start using the proxy resolve IPC for plugins....

chrome/browser/net/resolve_proxy_msg_helper.h

+// 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_
+#define CHROME_BROWSER_NET_RESOLVE_PROXY_MSG_HELPER_
+
+#include <deque>
+#include <string>
+
+#include "chrome/common/ipc_message.h"
+#include "net/base/completion_callback.h"
+#include "googleurl/src/gurl.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() {}
+  };
+
+  // Construct 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.
+  explicit ResolveProxyMsgHelper(Delegate* delegate,
+                                 net::ProxyService* proxy_service);
+
+  // Resolve 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);
+
+  // Start the first pending request.
+  void StartPendingRequest();
+
+  // Get the proxy service instance to use.
+  net::ProxyService* GetProxyService() 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_;
+
+  Delegate* delegate_;
+
+  // Specified by unit-tests, to use this proxy service in place of the
+  // global one.
+  net::ProxyService* proxy_service_override_;
+};
+
+#endif  // CHROME_BROWSER_NET_RESOLVE_PROXY_MSG_HELPER_