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// Copyright (c) 2012 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 REMOTING_HOST_SIGNALING_CONNECTOR_H_
#define REMOTING_HOST_SIGNALING_CONNECTOR_H_
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "base/timer/timer.h"
#include "net/base/network_change_notifier.h"
#include "remoting/host/oauth_token_getter.h"
#include "remoting/signaling/xmpp_signal_strategy.h"
namespace remoting {
class DnsBlackholeChecker;
// SignalingConnector listens for SignalStrategy status notifications
// and attempts to keep it connected when possible. When signalling is
// not connected it keeps trying to reconnect it until it is
// connected. It limits connection attempt rate using exponential
// backoff. It also monitors network state and reconnects signalling
// whenever connection type changes or IP address changes.
class SignalingConnector
: public base::SupportsWeakPtr<SignalingConnector>,
public base::NonThreadSafe,
public SignalStrategy::Listener,
public net::NetworkChangeNotifier::ConnectionTypeObserver,
public net::NetworkChangeNotifier::IPAddressObserver {
public:
// The |auth_failed_callback| is called when authentication fails.
SignalingConnector(XmppSignalStrategy* signal_strategy,
std::unique_ptr<DnsBlackholeChecker> dns_blackhole_checker,
OAuthTokenGetter* oauth_token_getter,
const base::Closure& auth_failed_callback);
~SignalingConnector() override;
// OAuthTokenGetter callback.
void OnAccessToken(OAuthTokenGetter::Status status,
const std::string& user_email,
const std::string& access_token);
// SignalStrategy::Listener interface.
void OnSignalStrategyStateChange(SignalStrategy::State state) override;
bool OnSignalStrategyIncomingStanza(const buzz::XmlElement* stanza) override;
// NetworkChangeNotifier::ConnectionTypeObserver interface.
void OnConnectionTypeChanged(
net::NetworkChangeNotifier::ConnectionType type) override;
// NetworkChangeNotifier::IPAddressObserver interface.
void OnIPAddressChanged() override;
private:
void OnNetworkError();
void ScheduleTryReconnect();
void ResetAndTryReconnect();
void TryReconnect();
void OnDnsBlackholeCheckerDone(bool allow);
XmppSignalStrategy* signal_strategy_;
base::Closure auth_failed_callback_;
std::unique_ptr<DnsBlackholeChecker> dns_blackhole_checker_;
OAuthTokenGetter* oauth_token_getter_;
// Number of times we tried to connect without success.
int reconnect_attempts_;
base::OneShotTimer timer_;
DISALLOW_COPY_AND_ASSIGN(SignalingConnector);
};
} // namespace remoting
#endif // REMOTING_HOST_SIGNALING_CONNECTOR_H_
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