使用 firebase 云功能将图像保存到 gcloud

Question

我想在云功能中保存从 unsplash 中选择的图像 - 运行它在后台。这是我的代码：

export const getUnsplashCron = functions
  .region('europe-west1')
  .runWith({ memory: '512MB', timeoutSeconds: 15 })
  .https.onRequest(async(req, res) => {

    if (!req.query.url) {
      res.status(300).send('no url');
    }

    return request({
      url: req.query.url + '?client_id=' + environment.unsplash.appId,
      encoding: null
    }, (err, response, body) => {
      if (!err && response.statusCode === 200) {

        const stream = require('stream');
        const bufferStream = new stream.PassThrough();

        bufferStream.end(Buffer.from(body, 'base64'));

        const file = admin.storage().bucket().file('name.jpg');

        bufferStream.pipe(
          file.createWriteStream({
            public: true
          }))
          .on('error', function(error) {
            console.log(error);
            return res.status(500).send(error)
          })
          .on('finish', function() {

            const config: GetSignedUrlConfig = {
              action: 'read',
              expires: '01-01-2025'
            };
            file.getSignedUrl(config, function(error, url) {
              console.log(url);
              if (error) {
                return res.status(500).send(error);
              }
              return res.status(500).send(url);
            });

          });


      }
    });

  });

但是我得到了

Error: Not Found at Util.parseHttpRespBody (/srv/node_modules/@google-cloud/common/build /src/util.js:172:38) at Util.handleResp (/srv/node_modules/@google-cloud/common/build/src/util.js:116:117) at retryRequest (/srv/node_modules/@google-cloud/common/build/src/util.js:404:22) at onResponse (/srv/node_modules/retry-request/index.js:200:7) at /srv/node_modules/teeny-request/build/src/index.js:158:17 at at process._tickDomainCallback (internal/process/next_tick.js:229:7) code: 404, errors: [ { domain: 'global', reason: 'notFound', message: 'Not Found' } ], response: undefined, message: 'Not Found' }

我做错了什么？！

Answer 1

您应该使用承诺来处理异步任务（例如对 unsplash 的 HTTP 调用或对云存储的写入）。默认情况下 request 不会 return promises，所以你需要为请求使用接口包装器，比如 request-promise.

因此您应该按如下方式修改您的代码：

const rp = require('request-promise');
.....

export const getUnsplashCron = functions
  .region('europe-west1')
  .runWith({ memory: '512MB', timeoutSeconds: 15 })
  .https.onRequest(async(req, res) => {

  .......

  const options = {
    uri: req.query.url + '?client_id=' + environment.unsplash.appId
  };

  rp(options)
    .then(response => {
      .... //Upload your file
      res.send('Success');
    })
    .catch(err => {
      // API call failed...
      res.status(500).send('Error': err);
    });
};

您可以观看此官方视频系列以了解更多详情：https://firebase.google.com/docs/functions/video-series/（尤其是标题为 "Learn JavaScript Promises" 的 3 个视频）。

使用 firebase 云功能将图像保存到 gcloud

Saving Image to gcloud with firebase cloud function

node.js

gcloud

google-cloud-functions