/// <summary>
/// Creates wss connection, monitors for disconnection and re-connects when necessary
/// </summary>
public override void Connect()
{
if (IsConnected)
{
return;
}
Log.Trace("BaseWebSocketsBrokerage.Connect(): Connecting...");
WebSocket.Connect();
Wait(_connectionTimeout, () => WebSocket.IsOpen);
_cancellationTokenSource = new CancellationTokenSource();
_connectionMonitorThread = new Thread(() =>
{
var nextReconnectionAttemptUtcTime = DateTime.UtcNow;
double nextReconnectionAttemptSeconds = 1;
lock (_lockerConnectionMonitor)
{
LastHeartbeatUtcTime = DateTime.UtcNow;
}
try
{
while (!_cancellationTokenSource.IsCancellationRequested)
{
if (WebSocket.IsOpen)
{
LastHeartbeatUtcTime = DateTime.UtcNow;
}
TimeSpan elapsed;
lock (_lockerConnectionMonitor)
{
elapsed = DateTime.UtcNow - LastHeartbeatUtcTime;
}
if (!_connectionLost && elapsed > TimeSpan.FromSeconds(_heartbeatTimeout))
{
if (WebSocket.IsOpen)
{
// connection is still good
LastHeartbeatUtcTime = DateTime.UtcNow;
}
else
{
_connectionLost = true;
nextReconnectionAttemptUtcTime = DateTime.UtcNow.AddSeconds(nextReconnectionAttemptSeconds);
OnMessage(BrokerageMessageEvent.Disconnected("Connection with server lost. This could be because of internet connectivity issues."));
}
}
else if (_connectionLost)
{
try
{
if (elapsed <= TimeSpan.FromSeconds(_heartbeatTimeout))
{
_connectionLost = false;
nextReconnectionAttemptSeconds = 1;
OnMessage(BrokerageMessageEvent.Reconnected("Connection with server restored."));
}
else
{
if (DateTime.UtcNow > nextReconnectionAttemptUtcTime)
{
try
{
Reconnect();
}
catch (Exception err)
{
// double the interval between attempts (capped to 1 minute)
nextReconnectionAttemptSeconds = Math.Min(nextReconnectionAttemptSeconds * 2, 60);
nextReconnectionAttemptUtcTime = DateTime.UtcNow.AddSeconds(nextReconnectionAttemptSeconds);
Log.Error(err);
}
}
}
}
catch (Exception exception)
{
Log.Error(exception);
}
}
Thread.Sleep(10000);
}
}
catch (Exception exception)
{
Log.Error(exception);
}
})
{
IsBackground = true
};
_connectionMonitorThread.Start();
while (!_connectionMonitorThread.IsAlive)
{
Thread.Sleep(1);
}
}
