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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 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/jingle_glue/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   virtual ~SignalingConnector();
     39 
     40   // May be called immediately after the constructor to enable OAuth
     41   // access token updating.
     42   // |oauth_token_getter| must outlive SignalingConnector.
     43   void EnableOAuth(OAuthTokenGetter* oauth_token_getter);
     44 
     45   // OAuthTokenGetter callback.
     46   void OnAccessToken(OAuthTokenGetter::Status status,
     47                      const std::string& user_email,
     48                      const std::string& access_token);
     49 
     50   // SignalStrategy::Listener interface.
     51   virtual void OnSignalStrategyStateChange(
     52       SignalStrategy::State state) OVERRIDE;
     53   virtual bool OnSignalStrategyIncomingStanza(
     54       const buzz::XmlElement* stanza) OVERRIDE;
     55 
     56   // NetworkChangeNotifier::ConnectionTypeObserver interface.
     57   virtual void OnConnectionTypeChanged(
     58       net::NetworkChangeNotifier::ConnectionType type) OVERRIDE;
     59 
     60   // NetworkChangeNotifier::IPAddressObserver interface.
     61   virtual void OnIPAddressChanged() OVERRIDE;
     62 
     63  private:
     64   void OnNetworkError();
     65   void ScheduleTryReconnect();
     66   void ResetAndTryReconnect();
     67   void TryReconnect();
     68   void OnDnsBlackholeCheckerDone(bool allow);
     69 
     70   XmppSignalStrategy* signal_strategy_;
     71   base::Closure auth_failed_callback_;
     72   scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker_;
     73 
     74   OAuthTokenGetter* oauth_token_getter_;
     75 
     76   // Number of times we tried to connect without success.
     77   int reconnect_attempts_;
     78 
     79   base::OneShotTimer<SignalingConnector> timer_;
     80 
     81   DISALLOW_COPY_AND_ASSIGN(SignalingConnector);
     82 };
     83 
     84 }  // namespace remoting
     85 
     86 #endif  // REMOTING_HOST_SIGNALING_CONNECTOR_H_
     87