/
websocket.go
153 lines (127 loc) · 3.84 KB
/
websocket.go
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package server
import (
"encoding/json"
"net/http"
"github.com/deepmap/oapi-codegen/pkg/runtime"
"github.com/gorilla/websocket"
"github.com/labstack/echo/v4"
"github.com/mgeri/volley-scoreboard-plus/pkg/api"
)
const BroadcastStatus = "status"
const BroadcastPrefs = "prefs"
var (
upgrader = websocket.Upgrader{
// ReadBufferSize: 1024,
// WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
clients = make(map[*websocket.Conn]bool)
broadcast = make(chan string)
unicast = make(chan *websocket.Conn)
command = make(chan *api.ScoreboardCommand)
)
func (app *application) BroadcastStatusUpdate() {
broadcast <- BroadcastStatus
}
func (app *application) BroadcastPrefsUpdate() {
broadcast <- BroadcastPrefs
}
func (app *application) BroadcastCommand(cmd *api.ScoreboardCommand) {
command <- cmd
}
func (app *application) wsHandler(ctx echo.Context) error {
ws, err := upgrader.Upgrade(ctx.Response(), ctx.Request(), nil)
if err != nil {
ctx.Logger().Warnf("Error opening websocket: %v", err)
return err
}
ctx.Logger().Infof("New websocket from %v", ctx.Request().RemoteAddr)
unicast <- ws
return nil
}
func (app *application) wsService() {
for {
select {
case m := <-broadcast:
// broadcast to connected scoreboard
scoreboardMessage := new(api.ScoreboardMessage)
switch m {
case BroadcastStatus:
scoreboardMessage.Status = new(api.ScoreboardStatus)
if err := app.statusStore.Get(scoreboardMessage.Status); err != nil {
app.logger.Warnf("Websocket JSON get status from store error: %v", err)
continue
}
case BroadcastPrefs:
scoreboardMessage.Prefs = new(api.ScoreboardPrefs)
if err := app.prefsStore.Get(scoreboardMessage.Prefs); err != nil {
app.logger.Warnf("Websocket JSON get prefs from store error: %v", err)
continue
}
}
b, err := json.Marshal(scoreboardMessage)
if err != nil {
app.logger.Warnf("Websocket JSON marshal error: %v", err)
continue
}
// send to every client that is currently connected
for c := range clients {
err := c.WriteMessage(websocket.TextMessage, b)
if err != nil {
app.logger.Warnf("Websocket error (closing): %v", err)
c.Close()
delete(clients, c)
}
}
case c := <-command:
// broadcast command to connected scoreboard
scoreboardMessage := new(api.ScoreboardMessage)
scoreboardMessage.Command = c
b, err := json.Marshal(scoreboardMessage)
if err != nil {
app.logger.Warnf("Websocket JSON marshal error: %v", err)
continue
}
// send to every client that is currently connected
for c := range clients {
err := c.WriteMessage(websocket.TextMessage, b)
if err != nil {
app.logger.Warnf("Websocket error (closing): %v", err)
c.Close()
delete(clients, c)
}
}
case c := <-unicast:
// send status and prefs to new conntected scoreboard
clients[c] = true
scoreboardMessage := new(api.ScoreboardMessage)
scoreboardMessage.Status = new(api.ScoreboardStatus)
if err := app.statusStore.Get(scoreboardMessage.Status); err != nil {
app.logger.Warnf("Unicast Websocket JSON get status from store error: %v", err)
continue
}
scoreboardMessage.Prefs = new(api.ScoreboardPrefs)
if err := app.prefsStore.Get(scoreboardMessage.Prefs); err != nil {
app.logger.Warnf("Unicast Websocket JSON get prefs from store error: %v", err)
continue
}
b, err := json.Marshal(scoreboardMessage)
if err != nil {
app.logger.Warnf("Unicast Websocket JSON marshal error: %v", err)
continue
}
err = c.WriteMessage(websocket.TextMessage, b)
if err != nil {
app.logger.Warnf("Unicast Websocket error (closing): %v", err)
c.Close()
delete(clients, c)
}
}
}
}
func (app *application) registerHandlersWS(router runtime.EchoRouter) {
router.GET("", app.wsHandler)
go app.wsService()
}