/
websock.go
86 lines (76 loc) · 2.1 KB
/
websock.go
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package webapp
import (
"context"
"io"
"net/http"
"time"
"github.com/gorilla/websocket"
"github.com/mlctrez/web"
"github.com/nats-io/go-nats"
)
func (w *WebContext) OnConnected(ws *websocket.Conn) {
// no defer ws.Close() here to make sure client reconnects
// in the event of a server restart
webSocketcontext, cancel := context.WithCancel(w.App.ctx)
defer cancel()
app := w.App
logger := app.logger
address := ws.RemoteAddr().String()
logger.Println("new client", address, "connected")
defer func() {
w.App.logger.Println("client", address, "sending close try again message")
closeMessage := websocket.FormatCloseMessage(websocket.CloseTryAgainLater, "shutting down or restarting")
err := ws.WriteControl(websocket.CloseMessage, closeMessage, time.Now().Add(time.Millisecond*500))
if err != nil {
w.App.logger.Println("client", address, "error sending close message", err)
}
err = ws.Close()
if err != nil {
w.App.logger.Println("client", address, "error closing socket", err)
}
}()
subscription, err := app.Nats.Subscribe("lightStateChange", func(msg *nats.Msg) {
err := ws.WriteMessage(websocket.TextMessage, msg.Data)
if err != nil {
logger.Println("Messages error writing to client", address, err)
cancel()
}
})
if err != nil {
logger.Println("Nats.Subscribe", err)
cancel()
return
}
defer subscription.Unsubscribe()
var running = true
go func() {
for running {
md := make(map[string]interface{})
if err := ws.ReadJSON(&md); err != nil {
if err != io.EOF {
logger.Println("receive error", address, err)
}
cancel()
return
}
err := app.Nats.Publish("clientMessage", md)
if err != nil {
logger.Println("Publish clientMessage", err)
cancel()
return
}
}
}()
<-webSocketcontext.Done()
running = false
logger.Println("OnConnected exit", address)
}
func (w *WebContext) Messages(rw web.ResponseWriter, req *web.Request) {
ws, err := w.App.upgrader.Upgrade(rw, req.Request, nil)
if err != nil {
w.App.logger.Println("Messages Upgrade", err)
rw.WriteHeader(http.StatusBadRequest)
return
}
w.OnConnected(ws)
}