net/dns/dns_client.cc

   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 #include "net/dns/dns_client.h"
   6
   7 #include "base/bind.h"
   8 #include "base/rand_util.h"
   9 #include "net/base/net_log.h"
  10 #include "net/dns/address_sorter.h"
  11 #include "net/dns/dns_config_service.h"
  12 #include "net/dns/dns_session.h"
  13 #include "net/dns/dns_socket_pool.h"
  14 #include "net/dns/dns_transaction.h"
  15 #include "net/socket/client_socket_factory.h"
  16
  17 namespace net {
  18
  19 namespace {
  20
  21 class DnsClientImpl : public DnsClient {
  22  public:
  23   explicit DnsClientImpl(NetLog* net_log)
  24       : address_sorter_(AddressSorter::CreateAddressSorter()),
  25         net_log_(net_log) {}
  26
  27   virtual void SetConfig(const DnsConfig& config) OVERRIDE {
  28     factory_.reset();
  29     session_ = NULL;
  30     if (config.IsValid()) {
  31       ClientSocketFactory* factory = ClientSocketFactory::GetDefaultFactory();
  32       session_ = new DnsSession(config,
  33                                 DnsSocketPool::CreateDefault(factory),
  34                                 base::Bind(&base::RandInt),
  35                                 net_log_);
  36       factory_ = DnsTransactionFactory::CreateFactory(session_);
  37     }
  38   }
  39
  40   virtual const DnsConfig* GetConfig() const OVERRIDE {
  41     return session_.get() ? &session_->config() : NULL;
  42   }
  43
  44   virtual DnsTransactionFactory* GetTransactionFactory() OVERRIDE {
  45     return session_.get() ? factory_.get() : NULL;
  46   }
  47
  48   virtual AddressSorter* GetAddressSorter() OVERRIDE {
  49     return address_sorter_.get();
  50   }
  51
  52  private:
  53   scoped_refptr<DnsSession> session_;
  54   scoped_ptr<DnsTransactionFactory> factory_;
  55   scoped_ptr<AddressSorter> address_sorter_;
  56
  57   NetLog* net_log_;
  58 };
  59
  60 }  // namespace
  61
  62 // static
  63 scoped_ptr<DnsClient> DnsClient::CreateClient(NetLog* net_log) {
  64   return scoped_ptr<DnsClient>(new DnsClientImpl(net_log));
  65 }
  66
  67 }  // namespace net
  68