added proxy protocol

internal/net/proxyproto/conn.go

@@ -0,0 +1,17 @@
+package proxyproto
+
+import (
+	"net"
+
+	proxyproto "github.com/pires/go-proxyproto"
+)
+
+func WrapClientConn(ppv int, src, dst net.Addr, c net.Conn) net.Conn {
+	if ppv <= 0 {
+		return c
+	}
+
+	header := proxyproto.HeaderProxyFromAddrs(byte(ppv), src, dst)
+	header.WriteTo(c)
+	return c
+}