在云存储桶触发器上从Google Cloud函数调用Google Speech API

Question

我需要创建一个流程，在该事件中触发云功能时，我将音频文件上传到gcp云存储桶，然后将该文件发送到Google Speech API，以转换为json响应。

const speech = require('@google-cloud/speech');

exports.helloGCS = (event, callback) => {

  console.log(`Processing file: ${event.data.name}`);
  // some code to get data required for speech API
  const payload = {
    audio: {
      uri: 'https://storage.cloud.google.com/quantum-fusion-205506.appspot.com/videos/${event.data.name}'
    },
    config: {
      encoding: 'FLAC',
      languageCode: 'en-US'
    }
  };

  const client = new speech.SpeechClient({
    projectId: 'quantum-fusion-205506'
  });

  client.longRunningRecognize(payload)
    .then(responses => {
      const operation = responses[0];
    console.log('Operations : ', operation);
      // current example of getting operation status by operation name with HTTP call
      request(`https://speech.googleapis.com/v1/operations/${operation.latestResponse.name}?key=<XYZ>`, (error, response, body) => {
        console.log('Operation status response: ', body);
        console.log('Operation status response: ', error);
        console.log('Operation status response: ', response);
      });
    });
  callback();
};

返回的错误是

{ insertId: "000000-94e46263-c911-4cbb-9f96-e7a0bba6945b"
  labels: {…} 
  logName: "projects/quantum-fusion-205506/logs/cloudfunctions.googleapis.com%2Fcloud-functions"
  receiveTimestamp: "2019-03-31T19:59:43.941676738Z" 
  resource: {…} 
  severity: "ERROR" 
  textPayload: "Unhandled rejection" 
  timestamp: "2019-03-31T19:59:37.042Z" 
  trace: "projects/quantum-fusion-205506/traces/2ddeb72fed29d8b0387b0992a86e09d8" 
}
Error: 3 INVALID_ARGUMENT: Request contains an invalid argument/
at Object.exports.createStatusError (/user_code/node_modules/@google-cloud/speech/node_modules/grpc/src/common.js:91:15) 
at Object.onReceiveStatus (/user_code/node_modules/@google-cloud/speech/node_modules/grpc/src/client_interceptors.js:1204:28) 
at InterceptingListener._callNext (/user_code/node_modules/@google-cloud/speech/node_modules/grpc/src/client_interceptors.js:568:42) 
at InterceptingListener.onReceiveStatus (/user_code/node_modules/@google-
cloud/speech/node_modules/grpc/src/client_interceptors.js:618:8) 
at callback (/user_code/node_modules/@google-cloud/speech/node_modules/grpc/src/client_interceptors.js:845:24)"