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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_EXTENSIONS_API_DNS_DNS_API_H_
      6 #define CHROME_BROWSER_EXTENSIONS_API_DNS_DNS_API_H_
      7 
      8 #include <string>
      9 
     10 #include "chrome/browser/io_thread.h"
     11 #include "extensions/browser/extension_function.h"
     12 #include "net/base/address_list.h"
     13 #include "net/base/completion_callback.h"
     14 #include "net/dns/host_resolver.h"
     15 
     16 class IOThread;
     17 
     18 namespace extensions {
     19 
     20 class DnsResolveFunction : public AsyncExtensionFunction {
     21  public:
     22   DECLARE_EXTENSION_FUNCTION("dns.resolve", DNS_RESOLVE)
     23 
     24   DnsResolveFunction();
     25 
     26  protected:
     27   virtual ~DnsResolveFunction();
     28 
     29   // ExtensionFunction:
     30   virtual bool RunImpl() OVERRIDE;
     31 
     32   void WorkOnIOThread();
     33   void RespondOnUIThread();
     34 
     35  private:
     36   void OnLookupFinished(int result);
     37 
     38   std::string hostname_;
     39 
     40   bool response_;  // The value sent in SendResponse().
     41 
     42   // This instance is widely available through BrowserProcess, but we need to
     43   // acquire it on the UI thread and then use it on the IO thread, so we keep a
     44   // plain pointer to it here as we move from thread to thread.
     45   IOThread* io_thread_;
     46 
     47   scoped_ptr<net::HostResolver::RequestHandle> request_handle_;
     48   scoped_ptr<net::AddressList> addresses_;
     49 };
     50 
     51 }  // namespace extensions
     52 
     53 #endif  // CHROME_BROWSER_EXTENSIONS_API_DNS_DNS_API_H_
     54