add dmtf verb

lib/tasks/dtmf.js

@@ -0,0 +1,41 @@
+const Task = require('./task');
+const {TaskName, TaskPreconditions} = require('../utils/constants');
+
+class TaskDtmf extends Task {
+  constructor(logger, opts) {
+    super(logger, opts);
+    this.preconditions = TaskPreconditions.Endpoint;
+
+    this.dtmf = this.data.dtmf;
+    this.duration = this.data.duration || 500;
+  }
+
+  get name() { return TaskName.Dtmf; }
+
+  async exec(cs, ep) {
+    await super.exec(cs);
+    this.ep = ep;
+    try {
+      this.logger.info({data: this.data}, `sending dtmf ${this.dtmf}`);
+      await this.ep.execute('send_dtmf', `${this.dtmf}@${this.duration}`);
+      this.timer = setTimeout(this.notifyTaskDone.bind(this), this.dtmf.length * (this.duration + 250) + 750);
+      await this.awaitTaskDone();
+      this.logger.info({data: this.data}, `done sending dtmf ${this.dtmf}`);
+    } catch (err) {
+      this.logger.info(err, `TaskDtmf:exec - error playing ${this.dtmf}`);
+    }
+    this.emit('playDone');
+  }
+
+  async kill(cs) {
+    super.kill(cs);
+    if (this.ep.connected && !this.playComplete) {
+      this.logger.debug('TaskDtmf:kill - killing audio');
+      await this.ep.api('uuid_break', this.ep.uuid).catch((err) => this.logger.info(err, 'Error killing audio'));
+    }
+    clearTimeout(this.timer);
+    this.notifyTaskDone();
+  }
+}
+
+module.exports = TaskDtmf;