initial support for conference and queues

lib/tasks/leave.js

@@ -0,0 +1,22 @@
+const Task = require('./task');
+const {TaskName} = require('../utils/constants');
+
+class TaskLeave extends Task {
+  constructor(logger, opts, parentTask) {
+    super(logger, opts);
+  }
+
+  get name() { return TaskName.Leave; }
+
+  async exec(cs, ep) {
+    await super.exec(cs);
+    await this.awaitTaskDone();
+  }
+
+  async kill(cs) {
+    super.kill(cs);
+    this.notifyTaskDone();
+  }
+}
+
+module.exports = TaskLeave;