private ServerEndPoint FindSlave(ServerEndPoint endpoint, RedisCommand command) { if (endpoint.IsSlave && endpoint.IsSelectable(command)) { return(endpoint); } var slaves = endpoint.Slaves; for (int i = 0; i < slaves.Length; i++) { endpoint = slaves[i]; if (endpoint.IsSlave && endpoint.IsSelectable(command)) { return(endpoint); } } return(null); }
private ServerEndPoint FindMaster(ServerEndPoint endpoint, RedisCommand command) { int max = 5; do { if (!endpoint.IsSlave && endpoint.IsSelectable(command)) { return(endpoint); } endpoint = endpoint.Master; } while (endpoint != null && --max != 0); return(null); }
private ServerEndPoint Select(int slot, RedisCommand command, CommandFlags flags) { flags = Message.GetMasterSlaveFlags(flags); // only intersted in master/slave preferences ServerEndPoint[] arr; if (slot == NoSlot || (arr = map) == null) { return(Any(command, flags)); } ServerEndPoint endpoint = arr[slot], testing; // but: ^^^ is the MASTER slots; if we want a slave, we need to do some thinking if (endpoint != null) { switch (flags) { case CommandFlags.DemandSlave: return(FindSlave(endpoint, command) ?? Any(command, flags)); case CommandFlags.PreferSlave: testing = FindSlave(endpoint, command); if (testing != null) { return(testing); } break; case CommandFlags.DemandMaster: return(FindMaster(endpoint, command) ?? Any(command, flags)); case CommandFlags.PreferMaster: testing = FindMaster(endpoint, command); if (testing != null) { return(testing); } break; } if (endpoint.IsSelectable(command)) { return(endpoint); } } return(Any(command, flags)); }
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 // 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) ? server : null; break; case CommandFlags.PreferMaster: resendVia = server.IsSelectable(command) ? server : FindSlave(server, command); break; case CommandFlags.PreferSlave: resendVia = FindSlave(server, command) ?? (server.IsSelectable(command) ? server : null); break; case CommandFlags.DemandSlave: resendVia = FindSlave(server, command); break; } if (resendVia == null) { multiplexer.Trace("Unable to resend to " + endpoint); } else { message.PrepareToResend(resendVia, isMoved); retry = resendVia.TryEnqueue(message); } } 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); } }