Add event bus to pool for socket open/close

src/Pool.ts

@@ -1,16 +1,25 @@
 import {Socket} from "./util/Socket"
+import {EventBus} from "./util/EventBus"
 
 export class Pool {
   data: Map<string, Socket>
   constructor() {
     this.data = new Map()
+    this.bus = new EventBus()
   }
   has(url) {
     return this.data.has(url)
   }
   get(url) {
     if (!this.data.has(url)) {
-      this.data.set(url, new Socket(url))
+      const socket = new Socket(url)
+
+      this.data.set(url, socket)
+
+      socket.bus.addListeners({
+        open: () => this.bus.emit('open', {url}),
+        close: () => this.bus.emit('close', {url}),
+      })
     }
 
     return this.data.get(url)
@@ -19,7 +28,7 @@ export class Pool {
     const socket = this.data.get(url)
 
     if (socket) {
-      socket.disconnect()
+      socket.cleanup()
       this.data.delete(url)
     }
   }