fix: kcp 协议内部日志细节

cmd/internal/transport/kcp_packet_conn_linux_test.go

@@ -0,0 +1,62 @@
+//go:build linux
+
+package transport
+
+import (
+	"net"
+	"testing"
+)
+
+func TestKCPPendingTXReservationRollbackRestoresSequence(t *testing.T) {
+	conn := &platformKCPPacketConn{
+		kcpPacketConnBase: &kcpPacketConnBase{
+			closed: make(chan struct{}),
+		},
+		pendingTX: make(map[uint32]kcpPendingPacketDebug),
+	}
+
+	conv := uint32(42)
+	txID := conn.reservePendingTX(&net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 9000}, 128, &conv, nil)
+	if txID != 0 {
+		t.Fatalf("reservePendingTX() txID = %d, want 0", txID)
+	}
+	if conn.nextTXID != 1 {
+		t.Fatalf("nextTXID after reserve = %d, want 1", conn.nextTXID)
+	}
+	if _, ok := conn.pendingTX[txID]; !ok {
+		t.Fatal("pendingTX missing reserved record")
+	}
+
+	conn.rollbackPendingTX(txID)
+
+	if conn.nextTXID != 0 {
+		t.Fatalf("nextTXID after rollback = %d, want 0", conn.nextTXID)
+	}
+	if _, ok := conn.pendingTX[txID]; ok {
+		t.Fatal("pendingTX still contains rolled back record")
+	}
+}
+
+func TestKCPPendingTXReservationPreservesLaterSequenceOnOutOfOrderRollback(t *testing.T) {
+	conn := &platformKCPPacketConn{
+		kcpPacketConnBase: &kcpPacketConnBase{
+			closed: make(chan struct{}),
+		},
+		pendingTX: make(map[uint32]kcpPendingPacketDebug),
+	}
+
+	first := conn.reservePendingTX(&net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 9000}, 64, nil, nil)
+	second := conn.reservePendingTX(&net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 9001}, 64, nil, nil)
+	if first != 0 || second != 1 {
+		t.Fatalf("reserved tx IDs = %d,%d, want 0,1", first, second)
+	}
+
+	conn.rollbackPendingTX(first)
+
+	if conn.nextTXID != 2 {
+		t.Fatalf("nextTXID after out-of-order rollback = %d, want 2", conn.nextTXID)
+	}
+	if _, ok := conn.pendingTX[second]; !ok {
+		t.Fatal("pendingTX lost later reservation after rollback")
+	}
+}