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listener_udp.go
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listener_udp.go
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package nodes
import (
"errors"
"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
"github.com/TeaOSLab/EdgeNode/internal/goman"
"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
"github.com/TeaOSLab/EdgeNode/internal/stats"
"github.com/TeaOSLab/EdgeNode/internal/utils"
"github.com/iwind/TeaGo/types"
"github.com/pires/go-proxyproto"
"net"
"strings"
"sync"
"time"
)
const (
UDPConnLifeSeconds = 30
)
type UDPListener struct {
BaseListener
Listener *net.UDPConn
connMap map[string]*UDPConn
connLocker sync.Mutex
connTicker *utils.Ticker
reverseProxy *serverconfigs.ReverseProxyConfig
port int
isClosed bool
}
func (this *UDPListener) Serve() error {
// 获取分组端口
var groupAddr = this.Group.Addr()
var portIndex = strings.LastIndex(groupAddr, ":")
if portIndex >= 0 {
var port = groupAddr[portIndex+1:]
this.port = types.Int(port)
}
var firstServer = this.Group.FirstServer()
if firstServer == nil {
return errors.New("no server available")
}
this.reverseProxy = firstServer.ReverseProxy
if this.reverseProxy == nil {
return errors.New("no ReverseProxy configured for the server '" + firstServer.Name + "'")
}
this.connMap = map[string]*UDPConn{}
this.connTicker = utils.NewTicker(1 * time.Minute)
goman.New(func() {
for this.connTicker.Next() {
this.gcConns()
}
})
var buffer = make([]byte, 4*1024)
for {
if this.isClosed {
return nil
}
n, addr, err := this.Listener.ReadFrom(buffer)
if err != nil {
if this.isClosed {
return nil
}
return err
}
if n > 0 {
this.connLocker.Lock()
conn, ok := this.connMap[addr.String()]
this.connLocker.Unlock()
if ok && !conn.IsOk() {
_ = conn.Close()
ok = false
}
if !ok {
originConn, err := this.connectOrigin(firstServer.Id, this.reverseProxy, addr)
if err != nil {
remotelogs.Error("UDP_LISTENER", "unable to connect to origin server: "+err.Error())
continue
}
if originConn == nil {
remotelogs.Error("UDP_LISTENER", "unable to find a origin server")
continue
}
conn = NewUDPConn(firstServer, addr, this.Listener, originConn.(*net.UDPConn))
this.connLocker.Lock()
this.connMap[addr.String()] = conn
this.connLocker.Unlock()
}
_, _ = conn.Write(buffer[:n])
}
}
}
func (this *UDPListener) Close() error {
this.isClosed = true
if this.connTicker != nil {
this.connTicker.Stop()
}
// 关闭所有连接
this.connLocker.Lock()
for _, conn := range this.connMap {
_ = conn.Close()
}
this.connLocker.Unlock()
return this.Listener.Close()
}
func (this *UDPListener) Reload(group *serverconfigs.ServerAddressGroup) {
this.Group = group
this.Reset()
// 重置配置
var firstServer = this.Group.FirstServer()
if firstServer == nil {
return
}
this.reverseProxy = firstServer.ReverseProxy
}
func (this *UDPListener) connectOrigin(serverId int64, reverseProxy *serverconfigs.ReverseProxyConfig, remoteAddr net.Addr) (conn net.Conn, err error) {
if reverseProxy == nil {
return nil, errors.New("no reverse proxy config")
}
var retries = 3
var addr string
var failedOriginIds []int64
for i := 0; i < retries; i++ {
var origin *serverconfigs.OriginConfig
if len(failedOriginIds) > 0 {
origin = reverseProxy.AnyOrigin(nil, failedOriginIds)
}
if origin == nil {
origin = reverseProxy.NextOrigin(nil)
}
if origin == nil {
continue
}
conn, addr, err = OriginConnect(origin, this.port, remoteAddr.String(), "")
if err != nil {
failedOriginIds = append(failedOriginIds, origin.Id)
remotelogs.ServerError(serverId, "UDP_LISTENER", "unable to connect origin server: "+addr+": "+err.Error(), "", nil)
SharedOriginStateManager.Fail(origin, "", reverseProxy, func() {
reverseProxy.ResetScheduling()
})
continue
} else {
if !origin.IsOk {
SharedOriginStateManager.Success(origin, func() {
reverseProxy.ResetScheduling()
})
}
// PROXY Protocol
if reverseProxy != nil &&
reverseProxy.ProxyProtocol != nil &&
reverseProxy.ProxyProtocol.IsOn &&
(reverseProxy.ProxyProtocol.Version == serverconfigs.ProxyProtocolVersion1 || reverseProxy.ProxyProtocol.Version == serverconfigs.ProxyProtocolVersion2) {
var transportProtocol = proxyproto.UDPv4
if strings.Contains(remoteAddr.String(), "[") {
transportProtocol = proxyproto.UDPv6
}
header := proxyproto.Header{
Version: byte(reverseProxy.ProxyProtocol.Version),
Command: proxyproto.PROXY,
TransportProtocol: transportProtocol,
SourceAddr: remoteAddr,
DestinationAddr: this.Listener.LocalAddr(),
}
_, err = header.WriteTo(conn)
if err != nil {
_ = conn.Close()
return nil, err
}
}
return
}
}
if err == nil {
err = errors.New("server '" + types.String(serverId) + "': no available origin server can be used")
}
return
}
// 回收连接
func (this *UDPListener) gcConns() {
this.connLocker.Lock()
var closingConns = []*UDPConn{}
for addr, conn := range this.connMap {
if !conn.IsOk() {
closingConns = append(closingConns, conn)
delete(this.connMap, addr)
}
}
this.connLocker.Unlock()
for _, conn := range closingConns {
_ = conn.Close()
}
}
// UDPConn 自定义的UDP连接管理
type UDPConn struct {
addr net.Addr
proxyConn net.Conn
serverConn net.Conn
activatedAt int64
isOk bool
isClosed bool
}
func NewUDPConn(server *serverconfigs.ServerConfig, addr net.Addr, proxyConn *net.UDPConn, serverConn *net.UDPConn) *UDPConn {
var conn = &UDPConn{
addr: addr,
proxyConn: proxyConn,
serverConn: serverConn,
activatedAt: time.Now().Unix(),
isOk: true,
}
// 统计
if server != nil {
stats.SharedTrafficStatManager.Add(server.Id, "", 0, 0, 1, 0, 0, 0, server.ShouldCheckTrafficLimit(), server.PlanId())
}
goman.New(func() {
var buffer = utils.BytePool4k.Get()
defer func() {
utils.BytePool4k.Put(buffer)
}()
for {
n, err := serverConn.Read(buffer)
if n > 0 {
conn.activatedAt = time.Now().Unix()
_, writingErr := proxyConn.WriteTo(buffer[:n], addr)
if writingErr != nil {
conn.isOk = false
break
}
// 记录流量和带宽
if server != nil {
// 流量
stats.SharedTrafficStatManager.Add(server.Id, "", int64(n), 0, 0, 0, 0, 0, server.ShouldCheckTrafficLimit(), server.PlanId())
// 带宽
stats.SharedBandwidthStatManager.Add(server.UserId, server.Id, int64(n))
}
}
if err != nil {
conn.isOk = false
break
}
}
})
return conn
}
func (this *UDPConn) Write(b []byte) (n int, err error) {
this.activatedAt = time.Now().Unix()
n, err = this.serverConn.Write(b)
if err != nil {
this.isOk = false
}
return
}
func (this *UDPConn) Close() error {
this.isOk = false
if this.isClosed {
return nil
}
this.isClosed = true
return this.serverConn.Close()
}
func (this *UDPConn) IsOk() bool {
if !this.isOk {
return false
}
return time.Now().Unix()-this.activatedAt < UDPConnLifeSeconds // 如果超过 N 秒没有活动我们认为是超时
}