calckey/tools/migration/use-gridfs.js

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2017-11-06 08:57:03 +00:00
// for Node.js interpret
const { default: db } = require('../../built/db/mongodb')
const { default: DriveFile, getGridFSBucket } = require('../../built/api/models/drive-file')
const { Duplex } = require('stream')
const writeToGridFS = (bucket, buffer, ...rest) => new Promise((resolve, reject) => {
const writeStream = bucket.openUploadStreamWithId(...rest)
const dataStream = new Duplex()
dataStream.push(buffer)
dataStream.push(null)
writeStream.once('finish', resolve)
writeStream.on('error', reject)
dataStream.pipe(writeStream)
})
const migrateToGridFS = async (doc) => {
const id = doc._id
const buffer = doc.data.buffer
const created_at = doc.created_at
delete doc._id
delete doc.created_at
delete doc.datasize
delete doc.hash
delete doc.data
const bucket = await getGridFSBucket()
const added = await writeToGridFS(bucket, buffer, id, `${id}/${doc.name}`, { metadata: doc })
const result = await DriveFile.update(id, {
$set: {
uploadDate: created_at
}
})
return added && result.ok === 1
}
const main = async () => {
const docs = await db.get('drive_files').find()
const all = await Promise.all(docs.map(migrateToGridFS))
return all
}
main().then(console.dir).catch(console.error)