focus/backend/handlers/ws.go

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package handlers
import (
"encoding/json"
"log"
"github.com/gofiber/fiber/v2"
"github.com/gofiber/websocket/v2"
)
var (
subscribers = make(map[*websocket.Conn]bool)
)
func wsRouter(router fiber.Router) error {
router.Use("/", upgradeWebsocket)
router.Get("/", websocket.New(handleWebsocket))
return nil;
}
func upgradeWebsocket(c *fiber.Ctx) error {
if websocket.IsWebSocketUpgrade(c) {
c.Locals("allowed", true)
return c.Next()
}
return fiber.ErrUpgradeRequired
}
func handleWebsocket(c *websocket.Conn) {
subscribers[c] = true
defer func() {
delete(subscribers, c)
c.Close()
}()
for {
_, _, err := c.ReadMessage()
if err != nil {
return
}
}
}
func publish(content fiber.Map) {
jsonMessage, err := json.Marshal(content)
if err != nil {
log.Println("Error marshalling JSON:", err)
return
}
for s := range subscribers {
if err := s.WriteMessage(websocket.TextMessage, jsonMessage); err != nil {
log.Println("Error writing to websocket:", err)
s.Close()
}
}
}