Add comprehensive debug logging for TLV detection

Log TLVs, types, and SSL detection logic to diagnose why SSL TLVs aren't being found

Signed-off-by: speruri <surya.srikar.peruri@zalando.de>

Author: speruri

proxylistener/proxylistener.go

@@ -109,11 +109,15 @@ func (tl *tlvExtractorListener) Accept() (net.Conn, error) {
 	if pconn, ok := conn.(*proxyproto.Conn); ok {
 		log.Printf("[tlvExtractorListener] Got proxyproto.Conn")
 		if header := pconn.ProxyHeader(); header != nil {
-			log.Printf("[tlvExtractorListener] Got ProxyHeader")
+			log.Printf("[tlvExtractorListener] Got ProxyHeader, Version=%d", header.Version)
 			tlvs, err := header.TLVs()
 			if err != nil {
 				log.Printf("[tlvExtractorListener] Error getting TLVs: %v", err)
 			} else {
+				log.Printf("[tlvExtractorListener] TLVs count: %d", len(tlvs))
+				for i, tlv := range tlvs {
+					log.Printf("[tlvExtractorListener] TLV[%d]: Type=%d, Len=%d", i, tlv.Type, len(tlv.Value))
+				}
 				ssl := hasTLVSSL(tlvs)
 				key := conn.RemoteAddr().String() + "|" + conn.LocalAddr().String()
 				log.Printf("[tlvExtractorListener] Storing SSL=%v for key=%s", ssl, key)
@@ -179,10 +183,13 @@ func (c *tlvCacheCleanupConn) SetWriteDeadline(t time.Time) error {
 // hasTLVSSL checks if the TLV list contains SSL information (type 0x20).
 func hasTLVSSL(tlvs []proxyproto.TLV) bool {
 	for _, tlv := range tlvs {
+		log.Printf("[hasTLVSSL] Checking TLV Type=%d (looking for 32=0x20)", tlv.Type)
 		if tlv.Type == 0x20 { // PP2_TYPE_SSL
+			log.Printf("[hasTLVSSL] Found SSL TLV!")
 			return true
 		}
 	}
+	log.Printf("[hasTLVSSL] No SSL TLV found in %d TLVs", len(tlvs))
 	return false
 }