[英]How can make folder with Firebase Cloud Functions Storage
如何制作文件夹“帖子”?
bucket - > gs://app.appspot.com/posts
码
exports.generateThumbnail = functions.storage.object()
.onChange(event => {
const object = event.data
const filePath = object.name
const fileName = filePath.split('/').pop()
const fileBucket = object.bucket;
const bucket = gcs.bucket(fileBucket)
const tempFilePath = `/posts/${fileName}`
return bucket.file(filePath).download({
destination: tempFilePath
})
.then(() => {
console.log('image downloaded locally to', tempFilePath)
return spawn('convert', [tempFilePath, '-thumbnail', '400x400>', tempFilePath])
})
.then(() => {
console.log('thumbnail created')
// match end of string that contains a slash followed by 0 or more characters that are not a slash:
const thumbFilePath = filePath.replace(/(\/)?([^\/]*)*/, '$1thumb_$2')
console.log('afoter=thumbFilePath=='+thumbFilePath);
return bucket.upload(tempFilePath, {
destination: thumbFilePath
})
})
});
错误
错误:EROFS:只读文件系统,打开'/posts/image.jpg'?
除了/tmp
目录之外,Cloud Functions具有只读文件系统。 您需要使/tmp/posts
类的/posts
目录能够创建目录或写入。 您还可以使用node-tmp之类的东西来更轻松地管理临时文件/目录的创建。
工作代码如下:
//add 3 package
const path = require('path');
const os = require('os');
const fs = require('fs');
exports.generateThumbnail = functions.storage.object()
.onChange(event => {
const object = event.data;
const fileBucket = object.bucket;
const filePath = object.name;
const contentType = object.contentType;
const resourceState = object.resourceState;
const metageneration = object.metageneration;
const bucket = gcs.bucket(fileBucket);
const tempFilePath = path.join(os.tmpdir(), fileName);
return bucket.file(filePath).download({
destination: tempFilePath
}).then(() => {
console.log('Image downloaded locally to', tempFilePath);
// Generate a thumbnail using ImageMagick.
return spawn('convert', [tempFilePath, '-thumbnail', '400x400>', tempFilePath]);
}).then(() => {
console.log('Thumbnail created at', tempFilePath);
// We add a 'thumb_' prefix to thumbnails file name. That's where we'll upload the thumbnail.
const thumbFileName = `thumb_${fileName}`;
const thumbFilePath = path.join(path.dirname(filePath), thumbFileName);
// Uploading the thumbnail.
return bucket.upload(tempFilePath, {destination: thumbFilePath});
// Once the thumbnail has been uploaded delete the local file to free up disk space.
}).then(() => fs.unlinkSync(tempFilePath));
});
成功 - > / tmp / posts - > gs://app.appspot.com/posts
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