#238 - add 'listen' option to config verb (#239)

lib/session/call-session.js

@@ -270,6 +270,10 @@ class CallSession extends Emitter {
     return this.backgroundGatherTask;
   }
 
+  get isListenEnabled() {
+    return this.backgroundListenTask;
+  }
+
   get b3() {
     return this.rootSpan?.getTracingPropagation();
   }
@@ -461,6 +465,50 @@ class CallSession extends Emitter {
     }
   }
 
+  async startBackgroundListen(opts) {
+    if (this.isListenEnabled) {
+      this.logger.info('CallSession:startBackgroundListen - listen is already enabled, ignoring request');
+      return;
+    }
+    try {
+      this.logger.debug({opts}, 'CallSession:startBackgroundListen');
+      const t = normalizeJambones(this.logger, [opts]);
+      this.backgroundListenTask = makeTask(this.logger, t[0]);
+      const resources = await this._evaluatePreconditions(this.backgroundListenTask);
+      const {span, ctx} = this.rootSpan.startChildSpan(`background-gather:${this.backgroundListenTask.summary}`);
+      this.backgroundListenTask.span = span;
+      this.backgroundListenTask.ctx = ctx;
+      this.backgroundListenTask.exec(this, resources)
+        .then(() => {
+          this.logger.info('CallSession:startBackgroundListen: listen completed');
+          this.backgroundListenTask && this.backgroundListenTask.removeAllListeners();
+          this.backgroundListenTask && this.backgroundListenTask.span.end();
+          this.backgroundListenTask = null;
+          return;
+        })
+        .catch((err) => {
+          this.logger.info({err}, 'CallSession:startBackgroundListen: listen threw error');
+          this.backgroundListenTask && this.backgroundListenTask.removeAllListeners();
+          this.backgroundListenTask && this.backgroundListenTask.span.end();
+          this.backgroundListenTask = null;
+        });
+    } catch (err) {
+      this.logger.info({err, opts}, 'CallSession:startBackgroundListen - Error creating listen task');
+    }
+  }
+
+  async stopBackgroundListen() {
+    try {
+      if (this.backgroundListenTask) {
+        this.backgroundListenTask.removeAllListeners();
+        this.backgroundListenTask.kill().catch(() => {});
+      }
+    } catch (err) {
+      this.logger.info({err}, 'CallSession:stopBackgroundListen - Error stopping listen task');
+    }
+    this.backgroundListenTask = null;
+  }
+
   async enableBotMode(gather, autoEnable) {
     try {
       if (this.backgroundGatherTask) {

lib/tasks/config.js

@@ -8,7 +8,8 @@ class TaskConfig extends Task {
       'synthesizer',
       'recognizer',
       'bargeIn',
-      'record'
+      'record',
+      'listen'
     ].forEach((k) => this[k] = this.data[k] || {});
 
     if ('notifyEvents' in this.data) {
@@ -30,7 +31,7 @@ class TaskConfig extends Task {
       });
     }
     if (this.bargeIn.sticky) this.autoEnable = true;
-    this.preconditions = (this.bargeIn.enable || this.record?.action || this.data.amd) ?
+    this.preconditions = (this.bargeIn.enable || this.record?.action || this.listen?.url || this.data.amd) ?
       TaskPreconditions.Endpoint :
       TaskPreconditions.None;
   }
@@ -38,8 +39,9 @@ class TaskConfig extends Task {
   get name() { return TaskName.Config; }
 
   get hasSynthesizer() { return Object.keys(this.synthesizer).length; }
-
   get hasRecognizer() { return Object.keys(this.recognizer).length; }
+  get hasRecording() { return Object.keys(this.record).length; }
+  get hasListen() { return Object.keys(this.listen).length; }
 
   get summary() {
     const phrase = [];
@@ -54,6 +56,10 @@ class TaskConfig extends Task {
       const s = `{${v},${l}}`;
       phrase.push(`set recognizer${s}`);
     }
+    if (this.hasRecording) phrase.push(this.record.action);
+    if (this.hasListen) {
+      phrase.push(this.listen.enable ? `listen ${this.listen.url}` : 'stop listen');
+    }
     if (this.data.amd) phrase.push('enable amd');
     if (this.notifyEvents) phrase.push(`event notification ${this.notifyEvents ? 'on' : 'off'}`);
     return `${this.name}{${phrase.join(',')}`;
@@ -64,8 +70,7 @@ class TaskConfig extends Task {
 
     if (this.notifyEvents) {
       this.logger.debug(`turning event notification ${this.notifyEvents ? 'on' : 'off'}`);
-      cs.notifyEvents = !!this.data.notifEvents;
-
+      cs.notifyEvents = !!this.data.notifyEvents;
     }
 
     if (this.data.amd) {
@@ -147,6 +152,16 @@ class TaskConfig extends Task {
         this.logger.info({err}, 'Config: error starting recording');
       }
     }
+    if (this.hasListen) {
+      const {enable, ...opts} = this.listen;
+      if (enable) {
+        this.logger.debug({opts}, 'Config: enabling listen');
+        cs.startBackgroundListen({verb: 'listen', ...opts});
+      } else {
+        this.logger.info('Config: disabling listen');
+        cs.stopBackgroundListen();
+      }
+    }
   }
 
   async kill(cs) {

lib/tasks/listen.js

@@ -10,7 +10,7 @@ class TaskListen extends Task {
 
     [
       'action', 'auth', 'method', 'url', 'finishOnKey', 'maxLength', 'metadata', 'mixType', 'passDtmf', 'playBeep',
-      'sampleRate', 'timeout', 'transcribe', 'wsAuth'
+      'sampleRate', 'timeout', 'transcribe', 'wsAuth', 'disableBidirectionalAudio'
     ].forEach((k) => this[k] = this.data[k]);
 
     this.mixType = this.mixType || 'mono';
@@ -136,7 +136,9 @@ class TaskListen extends Task {
     }
 
     /* support bi-directional audio */
-    ep.addCustomEventListener(ListenEvents.PlayAudio, this._onPlayAudio.bind(this, ep));
+    if (!this.disableBiDirectionalAudio) {
+      ep.addCustomEventListener(ListenEvents.PlayAudio, this._onPlayAudio.bind(this, ep));
+    }
     ep.addCustomEventListener(ListenEvents.KillAudio, this._onKillAudio.bind(this, ep));
     ep.addCustomEventListener(ListenEvents.Disconnect, this._onDisconnect.bind(this, ep));
   }

lib/tasks/specs.json

@@ -42,11 +42,24 @@
       "recognizer": "#recognizer",
       "bargeIn": "#bargeIn",
       "record": "#recordOptions",
+      "listen": "#listenOptions",
       "amd": "#amd",
       "notifyEvents": "boolean"
     },
     "required": []
   },
+  "listenOptions": {
+    "properties": {
+      "enable": "boolean",
+      "url": "string",
+      "sampleRate": "number",
+      "wsAuth": "#auth",
+      "metadata": "object"
+    },
+    "required": [
+      "enable"
+    ]
+  },
   "bargeIn": {
     "properties": {
       "enable": "boolean",
@@ -275,6 +288,7 @@
       },
       "passDtmf": "boolean",
       "playBeep": "boolean",
+      "disableBidirectionalAudio": "boolean",
       "sampleRate": "number",
       "timeout": "number",
       "transcribe": "#transcribe",