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bind_address.go
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/
bind_address.go
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package types
import (
"encoding/json"
"fmt"
"net"
"regexp"
)
type BindAddr net.UDPAddr
const BIND_PORT = 0
func (a BindAddr) String() string {
if a.Port == BIND_PORT {
return a.IP.String()
} else {
return (*net.UDPAddr)(&a).String()
}
}
func (a *BindAddr) Set(v string) error {
addr, err := ResolveBindAddr(v)
if err != nil {
return err
} else if addr == nil {
return fmt.Errorf("invalid bind address '%v'", v)
}
*a = *addr
return nil
}
func (a BindAddr) MarshalJSON() ([]byte, error) {
return json.Marshal(fmt.Sprintf("%v", a))
}
func (a *BindAddr) UnmarshalJSON(bytes []byte) error {
var s string
if err := json.Unmarshal(bytes, &s); err != nil {
return err
}
addr, err := ResolveBindAddr(s)
if err != nil {
return err
}
*a = *addr
return nil
}
func (a *BindAddr) Equal(addr *Address) bool {
switch {
case a == nil && addr == nil:
return true
case a != nil && addr != nil:
return a.IP.Equal(addr.IP)
default:
return false
}
}
func (a *BindAddr) Clone() *BindAddr {
if a != nil {
addr := *a
return &addr
}
return nil
}
func ResolveBindAddr(s string) (*BindAddr, error) {
if matched, err := regexp.MatchString(`[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}:[0-9]{1,5}`, s); err != nil {
return nil, err
} else if matched {
if addr, err := net.ResolveUDPAddr("udp", s); err != nil {
return nil, err
} else if addr.Port == DEFAULT_PORT {
return nil, fmt.Errorf("%v: invalid 'bind' port (%v)", addr, addr.Port)
} else {
return &BindAddr{
IP: addr.IP.To4(),
Port: addr.Port,
}, nil
}
}
if matched, err := regexp.MatchString(`[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}`, s); err != nil {
return nil, err
} else if matched {
if ip := net.ParseIP(s); ip != nil {
return &BindAddr{
IP: ip.To4(),
Port: BIND_PORT,
}, nil
}
}
return nil, fmt.Errorf("%s is not a valid UDP address:port", s)
}