javascript - async.parallel 内的 async wait，回调变得未定义

Question

我试图在 async.parallel 中执行 async/await，但无法调用回调。但是如果我删除 async/await，则可以调用回调。下面是代码

let parallelFunc = listCamId.map(camId => {
    return async function (callback) {
      let insertRuleTransParam = {
        rule_id: ruleId,
        camera_id: camId,
        vas_id: vasId,
        additional_parameter: additionalParameter
      }

      let configParamCamera = { where: { id: camId } };
      let configParamRule = { where: { id: ruleId } };

      try {
        let ruleTrans = await createRuleTransaction(insertRuleTransParam);
        let rule = await ruleService.find(configParamRule, "one");
        let cam = await cameraService.find(configParamCamera, "one");
        let uri = await constructCamUri(cam.protocol, cam.user_access, cam.password, cam.ip_address, cam.port, cam.path);
        let visionParam = await startVasRule(vasId, ruleTrans.id, camId, rule.rule_path, rule.rule_exec, uri);
        let updateRuleParam = {
          port_stream: visionParam.port,
          url_stream: visionParam.url,
          mmap_in: visionParam.mmap_in,
          mmap_out: visionParam.mmap_out
        }
        await updateRuleTransaction(updateRuleParam);
        callback(null);
      } catch (e) {
        callback(e);
      }
    }
  })

  return new Promise((resolve, reject) => {
    async.parallel(parallelFunc, function (err, results) {
      if (err) {
        reject(err);
      } else {
        resolve('success');
      }
    })
  });

有人能指出代码有什么问题吗？

Answer 1

不要将 async.js 库用于 Promise 代码，也不要使用回调参数。只需使用 Promise.all等待多项事情:

let promises = listCamId.map(async function(camId) {
  let insertRuleTransParam = {
    rule_id: ruleId,
    camera_id: camId,
    vas_id: vasId,
    additional_parameter: additionalParameter
  }

  let configParamCamera = { where: { id: camId } };
  let configParamRule = { where: { id: ruleId } };

  let ruleTrans = await createRuleTransaction(insertRuleTransParam);
  let rule = await ruleService.find(configParamRule, "one");
  let cam = await cameraService.find(configParamCamera, "one");
  let uri = await constructCamUri(cam.protocol, cam.user_access, cam.password, cam.ip_address, cam.port, cam.path);
  let visionParam = await startVasRule(vasId, ruleTrans.id, camId, rule.rule_path, rule.rule_exec, uri);
  let updateRuleParam = {
    port_stream: visionParam.port,
    url_stream: visionParam.url,
    mmap_in: visionParam.mmap_in,
    mmap_out: visionParam.mmap_out
  }
  await updateRuleTransaction(updateRuleParam);
  return null;
});
return Promise.all(promises);