From dd4d9aa2613024e6b871a25280f81a1d2c460baf Mon Sep 17 00:00:00 2001
From: Dave Horton <daveh@beachdognet.com>
Date: Tue, 21 Mar 2023 12:16:12 -0400
Subject: [PATCH] Gather: if an empty array of hints are supplied, this signals
 we should mask global hints for this collection

---
 lib/session/call-session.js | 2 +-
 lib/tasks/gather.js         | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/session/call-session.js b/lib/session/call-session.js
index b1615a68..1886c67c 100644
--- a/lib/session/call-session.js
+++ b/lib/session/call-session.js
@@ -698,7 +698,7 @@ class CallSession extends Emitter {
         let skip = false;
         this.currentTask = task;
         if (TaskName.Gather === task.name && this.isBotModeEnabled) {
-          if (this.backgroundGatherTask.updateTaskInProgress(task)) {
+          if (this.backgroundGatherTask.updateTaskInProgress(task) !== false) {
             this.logger.info(`CallSession:exec skipping #${stackNum}:${taskNum}: ${task.name}`);
             skip = true;
           }
diff --git a/lib/tasks/gather.js b/lib/tasks/gather.js
index 2b41e6ea..0d4ea346 100644
--- a/lib/tasks/gather.js
+++ b/lib/tasks/gather.js
@@ -70,6 +70,10 @@ class TaskGather extends Task {
       if (this.asrTimeout > 0) this.asrDtmfTerminationDigit = recognizer.asrDtmfTerminationDigit;
       this.isContinuousAsr = this.asrTimeout > 0;
 
+      if (Array.isArray(this.data.recognizer.hints) && 0 == this.data.recognizer.hints.length) {
+        logger.debug('Gather: an empty hints array was supplied, so we will mask global hints');
+        this.maskGlobalSttHints = true;
+      }
       this.data.recognizer.hints = this.data.recognizer.hints || [];
       this.data.recognizer.altLanguages = this.data.recognizer.altLanguages || [];
     }
@@ -125,7 +129,7 @@ class TaskGather extends Task {
     const {updateSpeechCredentialLastUsed} = require('../utils/db-utils')(this.logger, cs.srf);
     const {getNuanceAccessToken, getIbmAccessToken} = cs.srf.locals.dbHelpers;
 
-    if (cs.hasGlobalSttHints) {
+    if (cs.hasGlobalSttHints && !this.maskGlobalSttHints) {
       const {hints, hintsBoost} = cs.globalSttHints;
       const setOfHints = new Set(this.data.recognizer.hints
         .concat(hints)
@@ -310,6 +314,7 @@ class TaskGather extends Task {
     const {timeout} = opts;
     this.timeout = timeout;
     this._startTimer();
+    return true;
   }
 
   _onDtmf(cs, ep, evt) {