Do not autoscale up on status requests (#388)

Author: Sammcb

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.22 AS builder
+FROM golang:1.23 AS builder
 
 WORKDIR /build
 

mcproto/types.go

@@ -56,6 +56,10 @@ type Handshake struct {
 	NextState       int
 }
 
+const (
+	StateStatus State = 1
+)
+
 type LegacyServerListPing struct {
 	ProtocolVersion int
 	ServerAddress   string

server/connector.go

@@ -223,8 +223,9 @@ func (c *Connector) HandleConnection(ctx context.Context, frontendConn net.Conn)
 			Debug("Got handshake")
 
 		serverAddress := handshake.ServerAddress
+		nextState := mcproto.State(handshake.NextState)
 
-		c.findAndConnectBackend(ctx, frontendConn, clientAddr, inspectionBuffer, serverAddress)
+		c.findAndConnectBackend(ctx, frontendConn, clientAddr, inspectionBuffer, serverAddress, nextState)
 	} else if packet.PacketID == mcproto.PacketIdLegacyServerListPing {
 		handshake, ok := packet.Data.(*mcproto.LegacyServerListPing)
 		if !ok {
@@ -243,7 +244,7 @@ func (c *Connector) HandleConnection(ctx context.Context, frontendConn net.Conn)
 
 		serverAddress := handshake.ServerAddress
 
-		c.findAndConnectBackend(ctx, frontendConn, clientAddr, inspectionBuffer, serverAddress)
+		c.findAndConnectBackend(ctx, frontendConn, clientAddr, inspectionBuffer, serverAddress, mcproto.StateStatus)
 	} else {
 		logrus.
 			WithField("client", clientAddr).
@@ -255,10 +256,10 @@ func (c *Connector) HandleConnection(ctx context.Context, frontendConn net.Conn)
 }
 
 func (c *Connector) findAndConnectBackend(ctx context.Context, frontendConn net.Conn,
-	clientAddr net.Addr, preReadContent io.Reader, serverAddress string) {
+	clientAddr net.Addr, preReadContent io.Reader, serverAddress string, nextState mcproto.State) {
 
 	backendHostPort, resolvedHost, waker := Routes.FindBackendForServerAddress(ctx, serverAddress)
-	if waker != nil {
+	if waker != nil && nextState > mcproto.StateStatus {
 		if err := waker(ctx); err != nil {
 			logrus.WithFields(logrus.Fields{"serverAddress": serverAddress}).WithError(err).Error("failed to wake up backend")
 			c.metrics.Errors.With("type", "wakeup_failed").Add(1)