remoting/host/signaling_connector.h

   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 REMOTING_HOST_SIGNALING_CONNECTOR_H_
   6 #define REMOTING_HOST_SIGNALING_CONNECTOR_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/weak_ptr.h"
  10 #include "base/threading/non_thread_safe.h"
  11 #include "base/timer/timer.h"
  12 #include "net/base/network_change_notifier.h"
  13 #include "remoting/host/oauth_token_getter.h"
  14 #include "remoting/signaling/xmpp_signal_strategy.h"
  15
  16 namespace remoting {
  17
  18 class DnsBlackholeChecker;
  19
  20 // SignalingConnector listens for SignalStrategy status notifications
  21 // and attempts to keep it connected when possible. When signalling is
  22 // not connected it keeps trying to reconnect it until it is
  23 // connected. It limits connection attempt rate using exponential
  24 // backoff. It also monitors network state and reconnects signalling
  25 // whenever connection type changes or IP address changes.
  26 class SignalingConnector
  27     : public base::SupportsWeakPtr<SignalingConnector>,
  28       public base::NonThreadSafe,
  29       public SignalStrategy::Listener,
  30       public net::NetworkChangeNotifier::ConnectionTypeObserver,
  31       public net::NetworkChangeNotifier::IPAddressObserver {
  32  public:
  33   // The |auth_failed_callback| is called when authentication fails.
  34   SignalingConnector(
  35       XmppSignalStrategy* signal_strategy,
  36       scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker,
  37       const base::Closure& auth_failed_callback);
  38   ~SignalingConnector() override;
  39
  40   // May be called immediately after the constructor to enable OAuth
  41   // access token updating.
  42   void EnableOAuth(scoped_ptr<OAuthTokenGetter> oauth_token_getter);
  43
  44   // OAuthTokenGetter callback.
  45   void OnAccessToken(OAuthTokenGetter::Status status,
  46                      const std::string& user_email,
  47                      const std::string& access_token);
  48
  49   // SignalStrategy::Listener interface.
  50   void OnSignalStrategyStateChange(SignalStrategy::State state) override;
  51   bool OnSignalStrategyIncomingStanza(const buzz::XmlElement* stanza) override;
  52
  53   // NetworkChangeNotifier::ConnectionTypeObserver interface.
  54   void OnConnectionTypeChanged(
  55       net::NetworkChangeNotifier::ConnectionType type) override;
  56
  57   // NetworkChangeNotifier::IPAddressObserver interface.
  58   void OnIPAddressChanged() override;
  59
  60  private:
  61   void OnNetworkError();
  62   void ScheduleTryReconnect();
  63   void ResetAndTryReconnect();
  64   void TryReconnect();
  65   void OnDnsBlackholeCheckerDone(bool allow);
  66
  67   XmppSignalStrategy* signal_strategy_;
  68   base::Closure auth_failed_callback_;
  69   scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker_;
  70
  71   scoped_ptr<OAuthTokenGetter> oauth_token_getter_;
  72
  73   // Number of times we tried to connect without success.
  74   int reconnect_attempts_;
  75
  76   base::OneShotTimer<SignalingConnector> timer_;
  77
  78   DISALLOW_COPY_AND_ASSIGN(SignalingConnector);
  79 };
  80
  81 }  // namespace remoting
  82
  83 #endif  // REMOTING_HOST_SIGNALING_CONNECTOR_H_