private static bool ServiceIsRunning(string serviceName)
{
lock (_LockRunningNode)
{
var temp = FailOverNodes.Where(s => s.ServiceName == serviceName && (string.IsNullOrWhiteSpace(s.Address) || s.Address == "*")).SingleOrDefault();
if (temp == null)
{
return(false);
}
if (temp.Status == NodeStatus.Running)
{
return(true);
}
//return FailOverNodes.Where(s => s.ServiceName == serviceName && (string.IsNullOrWhiteSpace(s.Address) || s.Address == "*")).SingleOrDefault()?.Status == NodeStatus.Running ? true : false;
}
return(false);
}
static SocketFailOverEngine()
{
ServicesCreated = new List <string>();
_LastCheckStatus = DateTime.MinValue;
_IPAddress = IPAddress.Any;// _IPHostEntry.AddressList[0];
_IPEndPoint = new IPEndPoint(_IPAddress, 11000);
_Socket = new Socket(_IPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
try
{
_Socket.Bind(_IPEndPoint);
_Socket.Listen(30);
//_Socket.ReceiveTimeout = 10;
FailOverResponser = Task.Factory.StartNew(() =>
{
while (true)
{
byte[] bytes = new Byte[1024];
Socket handler;
try
{
handler = _Socket.Accept();
}
catch (Exception e)
{
continue;
}
try
{
int bytesRec = handler.Receive(bytes);
byte[] serviceNamebytes = new Byte[1023];
byte code = bytes[0];
bytes.CopyTo(serviceNamebytes, 1);
string serviceName = Encoding.ASCII.GetString(bytes);
byte[] msg = new byte[1];
// msg 100: Command Not Exist
// msg 101: Internal Server Error
// msg 0 => StandBy
// msg 1 => Running
// msg 2 => This Service Not Exist In This Node
switch (code)
{
// Check Status
case 0:
if (ServiceIsRunning(serviceName))
{
msg[0] = 1;
}
else
{
msg[0] = 0;
}
break;
default:
msg[0] = 100;
break;
}
handler.Send(msg);
}
catch (Exception)
{
var msg = new byte[1];
msg[0] = 100;
handler.Send(msg);
}
finally
{
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
}
});
NodeStatusChecker = Task.Factory.StartNew(() =>
{
do
{
if (_LastCheckStatus == DateTime.MinValue || _LastCheckStatus < _LastCheckStatus.AddSeconds(20))
{
lock (_LockServicesCreated)
{
foreach (var service in ServicesCreated)
{
//var IsServiceRunning = ServiceIsRunning(service);
var temp = FailOverNodes.Where(s => s.ServiceName == service).OrderBy(s => s.Priority).ToArray();
var localNode = temp.Where(s => IsLocalService(s)).SingleOrDefault();
if (localNode == null)
{
continue;
}
var failOverCount = temp.Count();
for (int i = 0; i < failOverCount; i++)
{
byte status = CheckServiceStatus(temp[i]);
switch (status)
{
case 0: //StandBy
if (temp[i].Status != NodeStatus.StandBy)
{
lock (_LockRunningNode)
{
temp[i].Status = NodeStatus.StandBy;
temp[i].LastUpdateStatus = DateTime.Now;
}
}
break;
case 1: //Running
if (temp[i].Status != NodeStatus.Running)
{
lock (_LockRunningNode)
{
temp[i].Status = NodeStatus.Running;
temp[i].LastUpdateStatus = DateTime.Now;
}
}
break;
case 2: //This Service Not Exist In This Node
case 102: //Not Response Recive Or Faild Check Status
if (temp[i].Status != NodeStatus.Stop)
{
lock (_LockRunningNode)
{
temp[i].Status = NodeStatus.Stop;
temp[i].LastUpdateStatus = DateTime.Now;
}
}
break;
case 100: //Command Not Exist
case 101: //Internal Server Error
default:
if (temp[i].Status != NodeStatus.Unknown)
{
lock (_LockRunningNode)
{
temp[i].Status = NodeStatus.Unknown;
temp[i].LastUpdateStatus = DateTime.Now;
}
}
if (temp[i].LastUpdateStatus.AddSeconds(60) < DateTime.Now)
{
lock (_LockRunningNode)
{
temp[i].Status = NodeStatus.Stop;
temp[i].LastUpdateStatus = DateTime.Now;
}
}
break;
}
}
bool isShouldRun = false;
bool isAllNodesWithUperPriorityStoped = false;
for (int i = 0; i < failOverCount; i++)
{
if (temp[i].Status == NodeStatus.Running)
{
if (IsLocalService(temp[i]))
{
isShouldRun = true;
}
else
{
isShouldRun = false;
}
break;
}
else if (IsLocalService(temp[i]))
{
if (isAllNodesWithUperPriorityStoped)
{
isShouldRun = true;
}
else
{
isShouldRun = false;
}
}
else if (temp[i].Status == NodeStatus.Stop)
{
isAllNodesWithUperPriorityStoped = true;
}
else if (temp[i].Status == NodeStatus.StandBy || temp[i].Status == NodeStatus.Unknown)
{
isAllNodesWithUperPriorityStoped = false;
}
}
var newNodeStatus = isShouldRun ? NodeStatus.Running : NodeStatus.StandBy;
if (localNode.Status != newNodeStatus)
{
lock (_LockRunningNode)
{
localNode.Status = newNodeStatus;
}
}
}
_LastCheckStatus = DateTime.Now;
}
}
Task.Delay(100).Wait();
} while (true);
});
}
catch (Exception e)
{
throw new Exception($"Faild Launch FailOverEngine On { _IPEndPoint }", e);
}
}
