一段时间后，heroku上的node.js不断丢失图像 [英] node.js on heroku keeps losing image after a while

问题描述

一段时间后，我的Node.js应用程序不断丢失静态图像(.jpg，.png ...).它在我本地的win10桌面上甚至在heroku上都不会丢失任何图像，我的webpack bundle.js是从相同的静态路由(/pub或/dist)提供的，它们工作得很好.某种程度上，只有静态图片，当我第一次上传时，它们会在最初的几分钟内正确投放，过一会儿，它就会消失.我正在使用express.static进行静态路由声明，并使用multer进行文件上传.用于测试的文件都是小写.jpg(因为我听说heroku任意更改了所有大写扩展名)，所以我不知道是什么原因引起的.

my Node.js app keeps losing static images(.jpg, .png...) after a while. It doesn't lose any images on my local win10 desktop and even on heroku, my webpack bundle.js is served from the same static route(/pub or /dist) and they work just fine. somehow only the static images, they are served alright for first few minutes when I first uploaded then after a while, it disappears. I am using express.static for static route declaration and multer for file upload. The files used for test were all lowercase .jpg(since I've heard heroku arbitrarily changes all uppercase extensions) so I don't know what's causing the problem.

服务器代码:

const storage = multer.diskStorage({
  destination: (req,file,cb)=>{
    cb(null,'pub/')
  },
  filename: (req,file,cb)=>{
    cb(null,Date.now() + file.originalname)
  }
})
const upload = multer({storage:storage})

//access to static files
app.use('/pub', express.static(pubDir))
app.use('/dist', express.static(dstDir))

app.post('/modwimg',upload.any(),(req,res,next)=>{
//here I connect filename from files array to db
})

然后，如果有客户端请求，服务器将从数据库中获取文件名，并在其前面放置"/pub/".它在我的本地计算机和heroku上都可以正常工作.只是heroku上的图像过了一会儿就消失了.

then if there's a client request, the server fetches filename from the db and put '/pub/' in front of it. It works just fine on both my local machine and heroku. it's only that images on heroku disappear after a while.

推荐答案

heroku文件系统是瞬态的.如果要允许用户将文件上传到您的应用程序，则需要使用外部存储(例如S3)，数据库Blob或托管服务(例如cloudinary).有关更多信息，请参见此线程: https://www.reddit.com/r/rails/comments/2k9sq4/heroku_any_files_you_upload_will_not_be_saved/

The heroku file system is transient. If you want to allow users to upload files to your app, you'll need to use external storage like S3, database blobs, or a hosted service like cloudinary. See this thread for more information: https://www.reddit.com/r/rails/comments/2k9sq4/heroku_any_files_you_upload_will_not_be_saved/

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