text: // Copyright 2017, Google, Inc.
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //    http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  const subscriber = require('./gcp/pubsub');
  const languageAPI = require('./gcp/languageapi');
  const storage = require('./gcp/spanner');
  
  console.log('Worker starting...');
  
  function feedbackHandler(message) {
      console.log('Feedback received');
      try {
          var messageData = JSON.parse(message.toString());
          console.log(messageData);
          languageAPI.analyze(messageData.feedback)
          .then(score => {
              console.log(`Score: ${score}`);
              messageData.score = score;
              return messageData;
          })
          .then(storage.saveFeedback)
          .then(() => {
              console.log('Feedback saved');  
          }).catch(console.error);
      } catch { 
          console.log("Invalid feedback message- no JSON data:", message.toString()) 
      }
  
  }
  subscriber.registerFeedbackNotification(feedbackHandler);
  console.log('Feedback registration complete...');
  