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package engine
import (
"fmt"
"log"
"net"
"runtime"
"strconv"
"time"
)
type Transport interface {
Write(data string, addr string, port int)
}
type udpTransport struct {
conn *net.UDPConn
}
func (p *udpTransport) setConn(conn *net.UDPConn) {
p.conn = conn
}
func (p *udpTransport) Write(data string, addr string, port int) {
laddr, err := net.ResolveUDPAddr("udp", addr+":"+strconv.Itoa(port))
if err != nil {
fmt.Println("resolve addr err: ", err)
return
}
_, er := p.conn.WriteTo([]byte(data), laddr)
if er != nil {
fmt.Println("resolve addr err: ", err)
return
}
}
type _reactor struct {
udp_listeners map[int]UdpClient
udp_conn map[int]*net.UDPConn
timer []*LaterCalling
}
func (p *_reactor) ListenUdp(addaport string, udp UdpClient) {
laddr, err := net.ResolveUDPAddr("udp", addaport)
if err == nil {
p.listenUdp(laddr, udp)
} else {
log.Println("resolve addr err: ", err)
return
}
}
type UdpClient interface {
DatagramReceived(data []byte, addr net.Addr)
SetUdpTransport(Transport)
}
func (p *_reactor) listenUdp(addr *net.UDPAddr, udp UdpClient) {
p.initReactor()
p.udp_listeners[addr.Port] = udp
log.Println("ntp server listening on (UDP)", addr.String())
c, erl := net.ListenUDP("udp", addr)
if erl != nil {
log.Fatal("listen error: ", erl)
} else {
p.udp_conn[addr.Port] = c
}
transport := new(udpTransport)
transport.setConn(c)
udp.SetUdpTransport(transport)
}
func (p *_reactor) initReactor() {
if p.udp_listeners == nil {
p.udp_listeners = make(map[int]UdpClient)
}
if p.udp_conn == nil {
p.udp_conn = make(map[int]*net.UDPConn)
}
}
var (
Reactor = new(_reactor)
listening_chan chan int
)
type LaterCalling struct {
millisecond int
call func()
}
type reactor interface {
ListenUdp(port int, client UdpClient)
CallLater(microsecond int, latercaller func())
Run()
}
func (p *_reactor) CallLater(millisecond int, lc func()) {
calling := new(LaterCalling)
calling.millisecond = millisecond
calling.call = lc
p.timer = append(p.timer, calling)
}
func (p *_reactor) Run() {
runtime.GOMAXPROCS(len(p.udp_conn))
for port, l := range p.udp_conn {
go handleUdpConnection(l, p.udp_listeners[port])
}
for len(p.timer) > 0 {
caller := p.timer[0]
p.timer = p.timer[1:]
selectTimer(caller)
}
for {
fmt.Println("------------------ Logs and Errors ------------------")
select {
case <-listening_chan:
fmt.Println("-----------------------------------------------------")
}
}
}
func selectTimer(caller *LaterCalling) {
select {
case <-time.After(time.Duration(caller.millisecond) * time.Millisecond):
caller.call()
}
}
func handleUdpConnection(conn *net.UDPConn, client UdpClient) {
for {
data := make([]byte, 512)
read_length, remoteAddr, err := conn.ReadFromUDP(data[0:])
if err != nil {
return
} else {
}
if read_length > 0 {
go panicWrapping(func() {
client.DatagramReceived(data[0:read_length], remoteAddr)
})
}
}
}
func panicWrapping(f func()) {
defer func() {
recover()
}()
f()
}
type UdpHandler struct {
udptransport Transport
}
func (p *UdpHandler) SetUdpTransport(transport Transport) {
p.udptransport = transport
}
func (p *UdpHandler) UdpWrite(data string, addr string, port int) {
p.udptransport.Write(data, addr, port)
}
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