update vendors

vendor/github.com/fatedier/kcp-go/readloop.go

@@ -0,0 +1,48 @@
+package kcp
+
+import (
+	"sync/atomic"
+
+	"github.com/pkg/errors"
+)
+
+func (s *UDPSession) defaultReadLoop() {
+	buf := make([]byte, mtuLimit)
+	var src string
+	for {
+		if n, addr, err := s.conn.ReadFrom(buf); err == nil {
+			// make sure the packet is from the same source
+			if src == "" { // set source address
+				src = addr.String()
+			} else if addr.String() != src {
+				atomic.AddUint64(&DefaultSnmp.InErrs, 1)
+				continue
+			}
+
+			if n >= s.headerSize+IKCP_OVERHEAD {
+				s.packetInput(buf[:n])
+			} else {
+				atomic.AddUint64(&DefaultSnmp.InErrs, 1)
+			}
+		} else {
+			s.notifyReadError(errors.WithStack(err))
+			return
+		}
+	}
+}
+
+func (l *Listener) defaultMonitor() {
+	buf := make([]byte, mtuLimit)
+	for {
+		if n, from, err := l.conn.ReadFrom(buf); err == nil {
+			if n >= l.headerSize+IKCP_OVERHEAD {
+				l.packetInput(buf[:n], from)
+			} else {
+				atomic.AddUint64(&DefaultSnmp.InErrs, 1)
+			}
+		} else {
+			l.notifyReadError(errors.WithStack(err))
+			return
+		}
+	}
+}