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pub_sub.go
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pub_sub.go
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package main
import (
"encoding/json"
"fmt"
"net"
"net/http"
"sync"
"github.com/gin-gonic/gin"
"github.com/gobwas/ws"
"github.com/gobwas/ws/wsutil"
)
const (
WsSubEvent = "sub"
WsPubEvent = "pub"
)
type WsMsg struct {
Topic string `json:"topic"`
Type string `json:"type"`
Payload string `json:"payload"`
Silent bool `json:"silent"`
}
func (msg *WsMsg) Marshal() []byte {
bytes, _ := json.Marshal(msg)
return bytes
}
func (msg *WsMsg) String() string {
return fmt.Sprintf("topic: %s, type: %s, silent: %v", msg.Topic, msg.Type, msg.Silent)
}
type WsPool struct {
sync.Mutex
Peers map[net.Conn]peer
}
type peer struct {
pubs map[string]WsMsg
subs map[string]struct{}
}
var wsPool = &WsPool{Peers: make(map[net.Conn]peer)}
func (w *WsPool) SetSub(c net.Conn, topic string) {
w.Lock()
defer w.Unlock()
if p, ok := w.Peers[c]; ok {
p.subs[topic] = struct{}{}
} else {
w.Peers[c] = peer{subs: map[string]struct{}{topic: {}}, pubs: map[string]WsMsg{}}
}
}
func (w *WsPool) GetSub(topic string) net.Conn {
w.Lock()
defer w.Unlock()
for c, p := range w.Peers {
if _, ok := p.subs[topic]; ok {
return c
}
}
return nil
}
func (w *WsPool) RemovePeer(c net.Conn) {
w.Lock()
defer w.Unlock()
_, ok := w.Peers[c]
if ok {
log.Info("find peer and delete: ", c.RemoteAddr())
delete(w.Peers, c)
}
if err := c.Close(); err != nil {
log.Errorf("close conn error: %s", err.Error())
}
}
func (w *WsPool) SetPub(c net.Conn, msg WsMsg) {
w.Lock()
defer w.Unlock()
if p, ok := w.Peers[c]; ok {
p.pubs[msg.Topic] = msg
} else {
w.Peers[c] = peer{pubs: map[string]WsMsg{msg.Topic: msg}, subs: map[string]struct{}{}}
}
}
func (w *WsPool) GetPub(topic string) *WsMsg {
w.Lock()
defer w.Unlock()
for _, p := range w.Peers {
if msg, ok := p.pubs[topic]; ok {
delete(p.pubs, topic)
return &msg
}
}
return nil
}
func subscribeController(conn net.Conn, topic string) {
wsPool.SetSub(conn, topic)
pubMsg := wsPool.GetPub(topic)
if pubMsg == nil {
return
}
if err := wsutil.WriteServerText(conn, pubMsg.Marshal()); err != nil {
log.Error("subscribe controller write err", err.Error())
} else {
log.Info("outgoing self", conn.RemoteAddr(), pubMsg.String())
}
}
func publishController(conn net.Conn, msg WsMsg) {
if !msg.Silent {
PushNotification(msg.Topic)
}
if c := wsPool.GetSub(msg.Topic); c != nil {
if err := wsutil.WriteServerText(c, msg.Marshal()); err != nil {
log.Error("publish controller write err", err.Error())
} else {
log.Info("outgoing side", c.RemoteAddr(), msg.String())
}
} else {
wsPool.SetPub(conn, msg)
}
}
func WebSocketHandler(ctx *gin.Context) {
if !ctx.IsWebsocket() {
ctx.String(http.StatusBadRequest, "This is a the websocket API")
return
}
conn, _, _, err := ws.UpgradeHTTP(ctx.Request, ctx.Writer)
if err != nil {
log.Errorf("web socket connect err: %s", err.Error())
return
}
log.Info("success to peer connection:", conn.RemoteAddr())
go func() {
defer wsPool.RemovePeer(conn)
for {
msgBt, err := wsutil.ReadClientText(conn)
if err != nil {
log.Errorf("web socket read client data err: %s", err.Error())
return
}
var msg WsMsg
if err = json.Unmarshal(msgBt, &msg); err != nil {
log.Errorf("web socket unmarshal msg err: %s", err.Error())
break
}
log.Info("incoming", conn.RemoteAddr(), msg.String())
switch msg.Type {
case WsSubEvent:
subscribeController(conn, msg.Topic)
case WsPubEvent:
publishController(conn, msg)
default:
log.Warning("web socket msg type is not exist!", msg.Type)
}
}
}()
}