数据库触发firebase功能从URL下载图像并将其保存到存储 [英] database triggers firebase function to download images from URL and save it to storage

问题描述

我想下载图片并将其保存到存储中，当我的数据库使用'photo_url'字段进行更新时

 出口.saveToStorage = functions.database.ref（`/ images / $ {itemImageRef}`）
 .onWrite（event => {
 const filePath = event.data.val（）; 
 const（filename）filePath.split（'/'）。pop（）; 
 
 var download = request.get（filePath）.on（'error'，（err）=> {
）console.log（err）
}）
 .pipe（fs.createWriteStream（filename））; 
 
 download.on（'finish'，（）=> { 
 const bucket = gcs.bucket（'id.appspot.com'）; 
 const storagePath =`images / $ {filename}`; 
 
 return bucket.upload（download ，（{destination：storagePath}）
 .then（（）=> {
 console.log（'success upload'）; 
}）; 
}）; 
}）; 
  

它会记录错误：EROFS：只读文件系统，在错误时打开'image.jpg' （本机）。我想我无法检索由createWriteStream保存的文件？
那么我应该如何从网上下载图片？

解决方案

使用@Jobsamuel建议的帖子，代码现在可以运行：

（$ / $ / $ {itemImageRef}`）
.onWrite（event => {

$ const filePath = event.data.val（）;
const filename = filePath.split（'/'）。pop（）;

const bucket = gcs.bucket（'id .appspot.com'）;
const remoteWriteStream = bucket.file（filename）.createWriteStream（{
metadata：{contentType：'image / jpeg'}
}）;

request（filePath）.pipe（remoteWriteStream）
.on（'error'，（err）=> console.log（err））
.on（'finish'，（） => console.log（'success save image'））;

}）;

通过将请求结果直接传递给存储桶，可以通过跳过写入本地文件，我怀疑是我原来的代码失败的原因。另外，不要忘记为图片设置contentType。

I want to download the image and save it to storage when my database is updated with the 'photo_url' field

exports.saveToStorage = functions.database.ref(`/images/${itemImageRef}`)
.onWrite(event => {
  const filePath = event.data.val();
  const filename = filePath.split('/').pop();

  var download = request.get(filePath).on('error', (err) => {
    console.log(err)
  })
  .pipe(fs.createWriteStream(filename));

  download.on('finish', () => {
    const bucket = gcs.bucket('id.appspot.com');
    const storagePath = `images/${filename}`;

    return bucket.upload(download, { destination: storagePath })
    .then(() => {
      console.log('success upload');
    });
  });
});

it logs "Error: EROFS: read-only file system, open 'image.jpg' at Error (native)." I suppose I cannot retrieve the file saved by createWriteStream? So how should I download images from the web?

解决方案

with the post suggested by @Jobsamuel, the code now works:

exports.saveToStorage = functions.database.ref(`/images/${itemImageRef}`)
.onWrite(event => {

  const filePath = event.data.val();
  const filename = filePath.split('/').pop();

  const bucket = gcs.bucket('id.appspot.com');
  const remoteWriteStream = bucket.file(filename).createWriteStream({
    metadata: { contentType: 'image/jpeg' }
  });

  request(filePath).pipe(remoteWriteStream)
  .on('error', (err) => console.log(err))
  .on('finish', () => console.log('success save image'));

});

By pipe the request result directly to the bucket, it solves the problem by skipping the step writing to a local file, which I suspect is the reason my original code fails. Also, don't forget to set contentType for images.

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