Massive refactoring for better code structure

common/net/address.go

@@ -0,0 +1,68 @@
+package net
+
+import (
+	"net"
+	"strconv"
+)
+
+const (
+	AddrTypeIP     = byte(0x01)
+	AddrTypeDomain = byte(0x03)
+)
+
+type Address struct {
+	Type   byte
+	IP     net.IP
+	Domain string
+	Port   uint16
+}
+
+func IPAddress(ip []byte, port uint16) Address {
+	ipCopy := make([]byte, len(ip))
+	copy(ipCopy, ip)
+	// TODO: check IP length
+	return Address{
+		Type:   AddrTypeIP,
+		IP:     net.IP(ipCopy),
+		Domain: "",
+		Port:   port,
+	}
+}
+
+func DomainAddress(domain string, port uint16) Address {
+	return Address{
+		Type:   AddrTypeDomain,
+		IP:     nil,
+		Domain: domain,
+		Port:   port,
+	}
+}
+
+func (addr Address) IsIPv4() bool {
+	return addr.Type == AddrTypeIP && len(addr.IP) == net.IPv4len
+}
+
+func (addr Address) IsIPv6() bool {
+	return addr.Type == AddrTypeIP && len(addr.IP) == net.IPv6len
+}
+
+func (addr Address) IsDomain() bool {
+	return addr.Type == AddrTypeDomain
+}
+
+func (addr Address) String() string {
+	var host string
+	switch addr.Type {
+	case AddrTypeIP:
+		host = addr.IP.String()
+		if len(addr.IP) == net.IPv6len {
+			host = "[" + host + "]"
+		}
+
+	case AddrTypeDomain:
+		host = addr.Domain
+	default:
+		panic("Unknown Address Type " + strconv.Itoa(int(addr.Type)))
+	}
+	return host + ":" + strconv.Itoa(int(addr.Port))
+}