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udp_conn.go
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/
udp_conn.go
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package shadowsocks
import (
"net"
"sync"
"time"
)
type UDPConn struct {
Establishing chan struct{}
Timeout time.Duration
net.PacketConn
}
func NewUDPConn(conn net.PacketConn) *UDPConn {
c := &UDPConn{
PacketConn: conn,
Establishing: make(chan struct{}),
}
if c.PacketConn != nil {
close(c.Establishing)
}
return c
}
type UDPConnMapping struct {
nm map[string]*UDPConn
sync.Mutex
}
func NewUDPConnMapping() *UDPConnMapping {
m := &UDPConnMapping{
nm: make(map[string]*UDPConn),
}
return m
}
func (m *UDPConnMapping) Get(key string) (conn *UDPConn, ok bool) {
v, ok := m.nm[key]
if ok {
conn = v
}
return
}
// pass val=nil for stating it is establishing
func (m *UDPConnMapping) Insert(key string, val net.PacketConn) *UDPConn {
c := NewUDPConn(val)
m.nm[key] = c
return c
}
func (m *UDPConnMapping) Remove(key string) {
v, ok := m.nm[key]
if !ok {
return
}
select {
case <-v.Establishing:
_ = v.Close()
default:
close(v.Establishing)
}
delete(m.nm, key)
}