public object ConnectUser(string userName)
{
try
{
using (var db = new ZigChatContext())
{
// Check if there if a connection for the specified user name have ever been made
var existingConnection = db.Connections.Where(x => x.UserName.ToLower() == userName.ToLower()).SingleOrDefault();
if (existingConnection != null)
{
// If there's an old connection only the connection id and the online status are changed.
existingConnection.ConnectionId = Context.ConnectionId;
existingConnection.IsOnline = true;
}
else
{
// If not, then a new connection is created
db.Connections.Add(new Connection {
ConnectionId = Context.ConnectionId, UserName = userName, IsOnline = true
});
}
db.SaveChanges();
}
UsersOnline();
return(new { Success = true });
}
catch (Exception ex)
{
return(new { Success = false, ErrorMessage = ex.Message });
}
}
public static void PutUsersOffline()
{
using (var db = new ZigChatContext())
{
foreach (var connection in db.Connections)
{
connection.IsOnline = false;
}
db.SaveChanges();
}
}
public override Task OnReconnected()
{
using (var db = new ZigChatContext())
{
var connection = db.Connections.Where(x => x.ConnectionId == Context.ConnectionId).SingleOrDefault();
if (connection == null)
{
throw new Exception("An attempt to reconnect a non tracked connection id have been made.");
}
connection.IsOnline = true;
db.SaveChanges();
}
UsersOnline();
return(base.OnReconnected());
}
