start work on http/ws api

events.go

@@ -0,0 +1,42 @@
+package showbridge
+
+import (
+	"encoding/json"
+
+	"github.com/gorilla/websocket"
+)
+
+type Event struct {
+	Type  string `json:"type"`
+	Data  any    `json:"data,omitempty"`
+	Error string `json:"error,omitempty"`
+}
+
+func (e Event) toJSON() ([]byte, error) {
+	return json.Marshal(e)
+}
+
+func (r *Router) handleEvent(event Event) {
+	switch event.Type {
+	case "ping":
+		r.broadcastEvent(Event{Type: "pong"})
+	default:
+		r.logger.Warn("unknown event type", "eventType", event.Type)
+	}
+}
+
+func (r *Router) broadcastEvent(event Event) {
+	eventJSON, err := event.toJSON()
+	if err != nil {
+		r.logger.Error("failed to marshal event to JSON", "error", err)
+		return
+	}
+	r.wsConnsMu.Lock()
+	defer r.wsConnsMu.Unlock()
+	for _, conn := range r.wsConns {
+		err := conn.WriteMessage(websocket.TextMessage, eventJSON)
+		if err != nil {
+			r.logger.Error("failed to write message to websocket connection", "error", err)
+		}
+	}
+}