"Callback function is not a function" 遵循 Google Cloud Scheduler / PubSub 教程时出错

Question

我正在尝试为 Google 云上的 VM 实例创建 start/stop 计划。我正在关注由 Google 创建的 tutorial 但是当我到达 (Optional) Verify the functions work 部分并尝试测试 stopInstancePubSub 函数并传递 {"data":"eyJ6b25lIjoidXMtd2VzdDEtYiIsICJsYWJlbCI6ImVudj1kZXYifQo="} JSON 对象我得到以下错误：

2019-06-09 17:23:54.225 EDT
stopInstancePubSub
ipmdukx38xpw
TypeError: callback is not a function at exports.stopInstancePubSub (/srv/index.js:55:5) at /worker/worker.js:825:24 at <anonymous> at process._tickDomainCallback (internal/process/next_tick.js:229:7)

不确定我在这里做错了什么，我是否缺少传递给函数的另一个参数？

*编辑：正在使用的代码取自 Googles 教程：

const Buffer = require('safe-buffer').Buffer;
const Compute = require('@google-cloud/compute');
const compute = new Compute();

/**
 * Stops a Compute Engine instance.
 *
 * Expects a PubSub message with JSON-formatted event data containing the
 * following attributes:
 *  zone - the GCP zone the instances are located in.
 *  instance - the name of a single instance.
 *  label - the label of instances to start.
 *
 * Exactly one of instance or label must be specified.
 *
 * @param {!object} event Cloud Function PubSub message event.
 * @param {!object} callback Cloud Function PubSub callback indicating completion.
 */
exports.stopInstancePubSub = (event, callback) => {
  try {
    const pubsubMessage = event.data;
    const payload = _validatePayload(
      JSON.parse(Buffer.from(pubsubMessage.data, 'base64').toString())
    );
    const options = {filter: `labels.${payload.label}`};
    compute.getVMs(options).then(vms => {
      vms[0].forEach(instance => {
        if (payload.zone === instance.zone.id) {
          compute
            .zone(payload.zone)
            .vm(instance.name)
            .stop()
            .then(data => {
              // Operation pending.
              const operation = data[0];
              return operation.promise();
            })
            .then(() => {
              // Operation complete. Instance successfully stopped.
              const message = 'Successfully stopped instance ' + instance.name;
              console.log(message);
              callback(null, message);
            })
            .catch(err => {
              console.log(err);
              callback(err);
            });
        }
      });
    });
  } catch (err) {
    console.log(err);
    callback(err);
  }
};

/**
 * Validates that a request payload contains the expected fields.
 *
 * @param {!object} payload the request payload to validate.
 * @return {!object} the payload object.
 */
function _validatePayload(payload) {
  if (!payload.zone) {
    throw new Error(`Attribute 'zone' missing from payload`);
  } else if (!payload.label) {
    throw new Error(`Attribute 'label' missing from payload`);
  }
  return payload;
}

Answer 1

一个小时前遇到了同样的问题:)

尝试将 callback 作为第三个参数：

exports.stopInstancePubSub = (event, data, callback) => { ... }

希望对您有所帮助

Answer 2

尝试exports.stopInstancePubSub = (event, context, callback) => { ... }

source repo has been updated.

Answer 3

运行时版本问题

尝试使用：RuntimeNode.js6（已弃用）

这个解决方案帮我解决了

"Callback function is not a function" 遵循 Google Cloud Scheduler / PubSub 教程时出错

"Callback function is not a function" Error when following Google Cloud Scheduler / PubSub tutorial

node.js

google-cloud-platform

google-cloud-pubsub

google-cloud-scheduler