added initial support for REST-initiated outdials

lib/tasks/rest_dial.js

@@ -0,0 +1,82 @@
+const Task = require('./task');
+const {TaskName} = require('../utils/constants');
+
+/**
+ * Manages an outdial made via REST API
+ */
+class TaskRestDial extends Task {
+  constructor(logger, opts) {
+    super(logger, opts);
+
+    this.from = this.data.from;
+    this.to = this.data.to;
+    this.call_hook = this.data.call_hook;
+    this.timeout = this.data.timeout || 60;
+
+    this.on('connect', this._onConnect.bind(this));
+    this.on('callStatus', this._onCallStatus.bind(this));
+  }
+
+  get name() { return TaskName.RestDial; }
+
+  /**
+   * INVITE has just been sent at this point
+  */
+  async exec(cs, req) {
+    super.exec(cs);
+    this.req = req;
+
+    this._setCallTimer();
+    await this.awaitTaskDone();
+  }
+
+  kill() {
+    super.kill();
+    this._clearCallTimer();
+    if (this.req) {
+      this.req.cancel();
+      this.req = null;
+    }
+    this.notifyTaskDone();
+  }
+
+  async _onConnect(dlg) {
+    this.req = null;
+    const cs = this.callSession;
+    cs.setDialog(dlg);
+    const obj = Object.assign({}, cs.callInfo);
+
+    const tasks = await this.actionHook(this.call_hook, obj);
+    if (tasks && Array.isArray(tasks)) {
+      this.logger.debug({tasks: tasks}, `TaskRestDial: replacing application with ${tasks.length} tasks`);
+      cs.replaceApplication(tasks);
+    }
+    this.notifyTaskDone();
+  }
+
+  _onCallStatus(status) {
+    this.logger.debug(`CallStatus: ${status}`);
+    if (status >= 200) {
+      this.req = null;
+      this._clearCallTimer();
+      if (status !== 200) this.notifyTaskDone();
+    }
+  }
+
+  _setCallTimer() {
+    this.timer = setTimeout(this._onCallTimeout.bind(this), this.timeout * 1000);
+  }
+
+  _clearCallTimer() {
+    if (this.timer) clearTimeout(this.timer);
+    this.timer = null;
+  }
+
+  _onCallTimeout() {
+    this.logger.debug('TaskRestDial: timeout expired without answer, killing task');
+    this.timer = null;
+    this.kill();
+  }
+}
+
+module.exports = TaskRestDial;