public bool TryResend(int hashSlot, Message message, EndPoint endpoint, bool isMoved)
{
try
{
if (ServerType == ServerType.Standalone || hashSlot < 0 || hashSlot >= RedisClusterSlotCount)
{
return(false);
}
ServerEndPoint server = multiplexer.GetServerEndPoint(endpoint);
if (server != null)
{
bool retry = false;
if ((message.Flags & CommandFlags.NoRedirect) == 0)
{
message.SetAsking(!isMoved);
message.SetNoRedirect(); // once is enough
if (isMoved)
{
message.SetInternalCall();
}
// note that everything so far is talking about MASTER nodes; we might be
// wanting a SLAVE, so we'll check
ServerEndPoint resendVia = null;
var command = message.Command;
switch (Message.GetMasterSlaveFlags(message.Flags))
{
case CommandFlags.DemandMaster:
resendVia = server.IsSelectable(command, isMoved) ? server : null;
break;
case CommandFlags.PreferMaster:
resendVia = server.IsSelectable(command, isMoved) ? server : FindSlave(server, command);
break;
case CommandFlags.PreferSlave:
resendVia = FindSlave(server, command, isMoved) ?? (server.IsSelectable(command, isMoved) ? server : null);
break;
case CommandFlags.DemandSlave:
resendVia = FindSlave(server, command, isMoved);
break;
}
if (resendVia == null)
{
multiplexer.Trace("Unable to resend to " + endpoint);
}
else
{
message.PrepareToResend(resendVia, isMoved);
retry = resendVia.TryWrite(message) == WriteResult.Success;
}
}
if (isMoved) // update map; note we can still update the map even if we aren't actually goint to resend
{
var arr = MapForMutation();
var oldServer = arr[hashSlot];
arr[hashSlot] = server;
if (oldServer != server)
{
multiplexer.OnHashSlotMoved(hashSlot, oldServer?.EndPoint, endpoint);
}
}
return(retry);
}
return(false);
}
catch
{
return(false);
}
}