Chore: make the code more semantic

constant/metadata.go

@@ -0,0 +1,46 @@
+package constant
+
+import (
+	"net"
+)
+
+// Socks addr type
+const (
+	AtypIPv4       = 1
+	AtypDomainName = 3
+	AtypIPv6       = 4
+
+	TCP NetWork = iota
+	UDP
+
+	HTTP SourceType = iota
+	SOCKS
+)
+
+type NetWork int
+
+func (n *NetWork) String() string {
+	if *n == TCP {
+		return "tcp"
+	}
+	return "udp"
+}
+
+type SourceType int
+
+// Metadata is used to store connection address
+type Metadata struct {
+	NetWork  NetWork
+	Source   SourceType
+	AddrType int
+	Host     string
+	IP       *net.IP
+	Port     string
+}
+
+func (addr *Metadata) String() string {
+	if addr.Host == "" {
+		return addr.IP.String()
+	}
+	return addr.Host
+}