在云函数中找不到 /tmp/ 目录

Question

我正在尝试从云存储加载 csv 文件，更改标题并将其重新上传到云存储。

// Import the Google Cloud client libraries
const { Storage } = require('@google-cloud/storage');
const lineReplace = require('line-replace');

const storage = new Storage();
const bucketName = 'bucket';
const srcFilename = 'bq/cost.csv';
const localFilename = 'tmp/cost.csv';
const bucketFilename = 'ga/cost.csv';

exports.properGAHeaders = async (data, context) => {
  try {
    const file = data;

    // Downloads the file
    if (file.name = srcFilename) {
      const options = {
        // The path to which the file should be downloaded, e.g. "./file.txt"
        destination: localFilename,
      };
      await storage.bucket(bucketName).file(srcFilename).download(options);

      await lineReplace({
        file: localFilename,
        line: 1,
        text: 'ga:date,ga:medium,ga:source,ga:adClicks,ga:adCost,ga:impressions,ga:referralPath,ga:adContent,ga:campaign,ga:adFinalUrl',
        addNewLine: false,
        callback: ({
          file, line, text, replacedText, error,
        }) => {
          if (error) { console.log(error); }
          console.log(`${replacedText} is replaced with ${text}!`);
        },
      });
      await storage.bucket(bucketName).upload(localFilename, {
        destination: bucketFilename,
        // Support for HTTP requests made with `Accept-Encoding: gzip`
        gzip: false,
        // By setting the option `destination`, you can change the name of the
        // object you are uploading to a bucket.
        metadata: {
          // Enable long-lived HTTP caching headers
          // Use only if the contents of the file will never change
          // (If the contents will change, use cacheControl: 'no-cache')
          cacheControl: 'no-cache',
        },
      });

      console.log(`${localFilename} uploaded to ${bucketName}`);
    }
  } catch (err) { console.error(err); }
};

执行此操作时，我收到错误 Error: ENOENT: no such file or directory, open 'tmp/cost.csv'。

可能是什么问题？ 我正在使用 await 运行这些函数，因此它们应该同步运行。

Answer 1

tmp 的完整路径应以斜杠开头。例如：/tmp/cost.csv

更好的是，使用os.tmpdir() 构建路径，而不是硬编码理论上可能会改变的值。