fix(iframe): [PKG-IFRAME-03] release failed setup and bind message peers

packages/artplayer-tool-iframe/src/connection.ts

@@ -0,0 +1,28 @@
+import type { Packet, RequestHost } from './requests'
+import { cancelRequests } from './requests'
+
+interface ConnectionHost extends RequestHost {
+  url: string
+  onMessage: (event: MessageEvent<Packet>) => void
+}
+
+const connections = new WeakMap<ConnectionHost, () => void>()
+
+export function connect(host: ConnectionHost): void {
+  const owner = window
+  const receiver = host.onMessage
+  connections.set(host, () => owner.removeEventListener('message', receiver))
+  owner.addEventListener('message', receiver)
+  host.$iframe.src = host.url
+}
+
+export function releaseConnection(host: ConnectionHost): void {
+  const disconnect = connections.get(host)
+  connections.delete(host)
+  try {
+    disconnect?.()
+  }
+  finally {
+    cancelRequests(host)
+  }
+}