added sseevents

packages/app/src/classes/SSEEvents/index.js

@@ -0,0 +1,47 @@
+export default class SSEEvents {
+	constructor(url, events) {
+		this.url = url
+
+		for (const [event, handler] of Object.entries(events)) {
+			this.handlers.set(event, handler)
+		}
+
+		this.eventSource = new EventSource(url)
+
+		this.eventSource.onmessage = (event) => {
+			const parsed = JSON.parse(event.data)
+
+			console.debug(`[SSE] Message received`, parsed)
+
+			if (typeof parsed.event !== "string") {
+				console.error(`[SSE] Invalid event type: ${parsed.event}`)
+				return
+			}
+
+			this.trigger(parsed.event, parsed.data)
+		}
+	}
+
+	handlers = new Map()
+
+	on = (event, fn) => {
+		this.handlers.set(event, fn)
+	}
+
+	off = (event) => {
+		this.handlers.delete(event)
+	}
+
+	trigger = (event, data) => {
+		const handler = this.handlers.get(event)
+
+		if (handler) {
+			handler(data)
+		}
+	}
+
+	close = () => {
+		console.log(`[SSE] Closing connection`)
+		this.eventSource.close()
+	}
+}