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udpconn.go
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udpconn.go
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package conn
import (
"context"
"errors"
"github.com/esrrhs/gohome/common"
"github.com/esrrhs/gohome/group"
"github.com/esrrhs/gohome/loggo"
"net"
"sync"
)
type UdpConn struct {
info string
config *UdpConfig
dialer *udpConnDialer
listenersonny *udpConnListenerSonny
listener *udpConnListener
cancel context.CancelFunc
}
type udpConnDialer struct {
conn *net.UDPConn
}
type udpConnListenerSonny struct {
dstaddr *net.UDPAddr
fatherconn *net.UDPConn
recvch *common.Channel
isclose bool
}
type udpConnListener struct {
listenerconn *net.UDPConn
wg *group.Group
sonny sync.Map
accept *common.Channel
}
type UdpConfig struct {
MaxPacketSize int
RecvChanLen int
AcceptChanLen int
RecvChanPushTimeout int
}
func DefaultUdpConfig() *UdpConfig {
return &UdpConfig{
MaxPacketSize: 10240,
RecvChanLen: 128,
AcceptChanLen: 128,
RecvChanPushTimeout: 100,
}
}
func (c *UdpConn) Name() string {
return "udp"
}
func (c *UdpConn) Read(p []byte) (n int, err error) {
c.checkConfig()
if c.dialer != nil {
return c.dialer.conn.Read(p)
} else if c.listener != nil {
return 0, errors.New("listener can not be read")
} else if c.listenersonny != nil {
if c.listenersonny.isclose {
return 0, errors.New("read closed conn")
}
b := <-c.listenersonny.recvch.Ch()
if b == nil {
return 0, errors.New("read closed conn")
}
data := b.([]byte)
if len(data) > len(p) {
return 0, errors.New("read buffer too small")
}
copy(p, data)
return len(data), nil
}
return 0, errors.New("empty conn")
}
func (c *UdpConn) Write(p []byte) (n int, err error) {
c.checkConfig()
if c.dialer != nil {
return c.dialer.conn.Write(p)
} else if c.listener != nil {
return 0, errors.New("listener can not be write")
} else if c.listenersonny != nil {
if c.listenersonny.isclose {
return 0, errors.New("write closed conn")
}
return c.listenersonny.fatherconn.WriteToUDP(p, c.listenersonny.dstaddr)
}
return 0, errors.New("empty conn")
}
func (c *UdpConn) Close() error {
c.checkConfig()
if c.cancel != nil {
c.cancel()
}
if c.dialer != nil {
return c.dialer.conn.Close()
} else if c.listener != nil {
c.listener.wg.Stop()
c.listener.wg.Wait()
c.listener.sonny.Range(func(key, value interface{}) bool {
u := value.(*UdpConn)
u.Close()
return true
})
} else if c.listenersonny != nil {
c.listenersonny.recvch.Close()
c.listenersonny.isclose = true
}
return nil
}
func (c *UdpConn) Info() string {
c.checkConfig()
if c.info != "" {
return c.info
}
if c.dialer != nil {
c.info = c.dialer.conn.LocalAddr().String() + "<--udp-->" + c.dialer.conn.RemoteAddr().String()
} else if c.listener != nil {
c.info = "udp--" + c.listener.listenerconn.LocalAddr().String()
} else if c.listenersonny != nil {
c.info = c.listenersonny.fatherconn.LocalAddr().String() + "<--udp-->" + c.listenersonny.dstaddr.String()
} else {
c.info = "empty udp conn"
}
return c.info
}
func (c *UdpConn) Dial(dst string) (Conn, error) {
c.checkConfig()
addr, err := net.ResolveUDPAddr("udp", dst)
if err != nil {
return nil, err
}
ctx, cancel := context.WithCancel(context.Background())
c.cancel = cancel
var d net.Dialer
if gControlOnConnSetup != nil {
d = net.Dialer{Control: gControlOnConnSetup}
}
conn, err := d.DialContext(ctx, "udp", addr.String())
if err != nil {
return nil, err
}
c.cancel = nil
dialer := &udpConnDialer{conn: conn.(*net.UDPConn)}
return &UdpConn{config: c.config, dialer: dialer}, nil
}
func (c *UdpConn) Listen(dst string) (Conn, error) {
c.checkConfig()
ipaddr, err := net.ResolveUDPAddr("udp", dst)
if err != nil {
return nil, err
}
listenerconn, err := net.ListenUDP("udp", ipaddr)
if err != nil {
return nil, err
}
ch := common.NewChannel(c.config.AcceptChanLen)
wg := group.NewGroup("UdpConn Listen"+" "+dst, nil, func() {
listenerconn.Close()
ch.Close()
})
listener := &udpConnListener{
listenerconn: listenerconn,
wg: wg,
accept: ch,
}
u := &UdpConn{config: c.config, listener: listener}
wg.Go("UdpConn Listen loopRecv"+" "+dst, func() error {
return u.loopRecv()
})
return u, nil
}
func (c *UdpConn) Accept() (Conn, error) {
c.checkConfig()
if c.listener.wg == nil {
return nil, errors.New("not listen")
}
for !c.listener.wg.IsExit() {
s := <-c.listener.accept.Ch()
if s == nil {
break
}
sonny := s.(*UdpConn)
_, ok := c.listener.sonny.Load(sonny.listenersonny.dstaddr.String())
if !ok {
continue
}
if sonny.listenersonny.isclose {
continue
}
return sonny, nil
}
return nil, errors.New("listener close")
}
func (c *UdpConn) loopRecv() error {
c.checkConfig()
buf := make([]byte, c.config.MaxPacketSize)
for !c.listener.wg.IsExit() {
n, srcaddr, err := c.listener.listenerconn.ReadFromUDP(buf)
if err != nil {
return err
}
data := make([]byte, n)
copy(data, buf[0:n])
srcaddrstr := srcaddr.String()
v, ok := c.listener.sonny.Load(srcaddrstr)
if !ok {
sonny := &udpConnListenerSonny{
dstaddr: srcaddr,
fatherconn: c.listener.listenerconn,
recvch: common.NewChannel(c.config.RecvChanLen),
}
u := &UdpConn{config: c.config, listenersonny: sonny}
if !u.listenersonny.recvch.WriteTimeout(data, c.config.RecvChanPushTimeout) {
loggo.Debug("udp conn %s push %d data to %s recv channel timeout", c.Info(), len(data), u.Info())
}
c.listener.sonny.Store(srcaddrstr, u)
c.listener.accept.Write(u)
} else {
u := v.(*UdpConn)
if !u.listenersonny.recvch.WriteTimeout(data, c.config.RecvChanPushTimeout) {
loggo.Debug("udp conn %s push %d data to %s recv channel timeout", c.Info(), len(data), u.Info())
}
}
c.listener.sonny.Range(func(key, value interface{}) bool {
u := value.(*UdpConn)
if u.listenersonny.isclose {
c.listener.sonny.Delete(key)
}
return true
})
}
return nil
}
func (c *UdpConn) checkConfig() {
if c.config == nil {
c.config = DefaultUdpConfig()
}
}
func (c *UdpConn) SetConfig(config *UdpConfig) {
c.config = config
}
func (c *UdpConn) GetConfig() *UdpConfig {
c.checkConfig()
return c.config
}