/
gtund.go
209 lines (167 loc) · 4.28 KB
/
gtund.go
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package registry
import (
"encoding/json"
"errors"
"net"
"net/http"
"sync"
"time"
"github.com/ICKelin/gtun/common"
"github.com/ICKelin/gtun/logs"
)
type GtundConfig struct {
Listener string `toml:"listen"`
Token string `toml:"token"` // 内部系统鉴权token
}
type gtund struct {
listener string
token string
m *Models
}
func NewGtund(cfg *GtundConfig, m *Models) *gtund {
return >und{
listener: cfg.Listener,
token: cfg.Token,
m: m,
}
}
func (d *gtund) Run() error {
listener, err := net.Listen("tcp", d.listener)
if err != nil {
return err
}
defer listener.Close()
for {
conn, err := listener.Accept()
if err != nil {
return err
}
go d.onConn(conn)
}
}
func (d *gtund) GetGtundList(w http.ResponseWriter, r *http.Request) {
list := d.m.Status()
w.Header().Set("Content-Type", "application/json")
w.Write([]byte(list))
}
func (d *gtund) onConn(conn net.Conn) {
defer conn.Close()
reg, err := d.onRegister(conn)
if err != nil {
logs.Error("register fail: %v", err)
return
}
logs.Info("register gtund from %s %v", conn.RemoteAddr().String(), reg)
defer logs.Info("disconnect from %s", conn.RemoteAddr().String())
defer d.onDisconnect(conn.RemoteAddr().String())
sndbuffer := make(chan []byte)
done := make(chan struct{})
wg := &sync.WaitGroup{}
wg.Add(2)
go d.recv(conn, wg, sndbuffer, done)
go d.send(conn, wg, sndbuffer, done)
wg.Wait()
}
func (d *gtund) recv(conn net.Conn, wg *sync.WaitGroup, sndbuffer chan []byte, done chan struct{}) {
defer logs.Info("close receive")
defer close(done)
defer conn.Close()
defer wg.Done()
for {
cmd, bytes, err := common.Decode(conn)
if err != nil {
logs.Error("decode fail: %v", err)
break
}
switch cmd {
case common.S2G_HEARTBEAT:
d.onHeartbeat(conn, bytes, sndbuffer)
case common.S2G_UPDATE_CLIENT_COUNT:
d.onUpdate(conn, bytes, sndbuffer)
default:
logs.Warn("unimplemented cmd", cmd)
}
}
}
func (d *gtund) send(conn net.Conn, wg *sync.WaitGroup, sndbuffer chan []byte, done chan struct{}) {
defer logs.Info("close send")
defer conn.Close()
defer wg.Done()
for {
select {
case <-done:
return
case bytes := <-sndbuffer:
conn.SetWriteDeadline(time.Now().Add(time.Second * 10))
_, err := conn.Write(bytes)
conn.SetWriteDeadline(time.Time{})
if err != nil {
logs.Error("write to client: ", err)
return
}
}
}
}
func (d *gtund) onRegister(conn net.Conn) (*common.S2GRegister, error) {
cmd, bytes, err := common.Decode(conn)
if err != nil {
return nil, err
}
if cmd != common.S2G_REGISTER {
return nil, errors.New("invalid command")
}
reg := common.S2GRegister{}
err = json.Unmarshal(bytes, ®)
if err != nil {
return nil, err
}
if reg.Token != d.token {
msg := common.Response(nil, errors.New("invalid token"))
resp, err := common.Encode(common.G2S_REGISTER, msg)
if err != nil {
return nil, err
}
conn.SetWriteDeadline(time.Now().Add(time.Second * 10))
conn.Write(resp)
conn.SetWriteDeadline(time.Time{})
return nil, errors.New("invalid token")
}
// store gtund info
d.m.NewGtund(conn.RemoteAddr().String(), ®)
msg := common.Response(nil, nil)
resp, err := common.Encode(common.G2S_REGISTER, msg)
if err != nil {
return nil, err
}
conn.SetWriteDeadline(time.Now().Add(time.Second * 10))
conn.Write(resp)
conn.SetWriteDeadline(time.Time{})
return ®, nil
}
func (d *gtund) onDisconnect(addr string) {
d.m.RemoveGtund(addr)
}
func (d *gtund) onHeartbeat(conn net.Conn, bytes []byte, sndbuffer chan []byte) {
logs.Debug("on S2G_HEARTBEAT: %s %s", conn.RemoteAddr().String(), string(bytes))
bytes, err := common.Encode(common.G2S_HEARTBEAT, nil)
if err != nil {
logs.Error("encode fail: %v", err)
return
}
sndbuffer <- bytes
}
func (d *gtund) onUpdate(conn net.Conn, bytes []byte, sndbuffer chan []byte) {
logs.Debug("on S2G_UPDATE_CLIENT_COUNT: %s %s", conn.RemoteAddr().String(), string(bytes))
obj := &common.S2GUpdate{}
err := json.Unmarshal(bytes, obj)
if err != nil {
d.response(nil, err, sndbuffer)
return
}
d.m.UpdateRefCount(conn.RemoteAddr().String(), obj.Count)
}
func (d *gtund) response(data interface{}, err error, sndbuffer chan []byte) {
msg := common.Response(data, err)
resp, _ := common.Encode(common.G2S_UPDATE_CLIENT_COUNT, msg)
sndbuffer <- resp
}