support tts caching

lib/tasks/make_task.js

@@ -25,7 +25,8 @@ function makeTask(logger, obj, parent) {
       const TaskHangup = require('./hangup');
       return new TaskHangup(logger, data, parent);
     case TaskName.Say:
-      if (data.vendor === 'google' && !data.language) {
+      if (data.synthesizer.vendor === 'google' && !data.synthesizer.language) {
+        logger.debug('creating legacy say task');
         const TaskSayLegacy = require('./say-legacy');
         return new TaskSayLegacy(logger, data, parent);
       }

lib/tasks/say.js

@@ -29,8 +29,8 @@ class TaskSay extends Task {
       }, this.synthesizer);
 
       while (!this.killed && this.loop--) {
-        this.logger.debug(`TaskSay: remaining loops ${this.loop}`);
         if (!filepath) {
+          this.logger.debug('TaskSay:exec - retrieving synthesized audio');
           filepath = await synthAudio(opts);
           cs.trackTmpFile(filepath);
         }

lib/tasks/specs.json

@@ -190,11 +190,14 @@
         "enum": ["google", "aws", "polly"]
       },
       "language": "string",
-      "voice": "string"
+      "voice": "string",
+      "gender": {
+        "type": "string",
+        "enum": ["MALE", "FEMALE", "NEUTRAL"]
+      }
     },
     "required": [
-      "vendor",
-      "language"
+      "vendor"
     ]
   },
   "recognizer": {