在同一个Firebase项目中,使用云函数(编写在node.js中),首先下载FTP文件(使用npm ftp模块),然后尝试将其上传到Firebase存储。
目前所有的尝试都失败了,文档也没有帮助……如果有专家能给出建议/提示,将不胜感激。
以下代码使用了两种不同的方法:fs.createWriteStream()和bucket.file().createWriteStream()。但两者都失败了,原因各异(请参见代码中的错误消息)。
'use strict'
// [START import]
let admin = require('firebase-admin')
let functions = require('firebase-functions')
const gcpStorage = require('@google-cloud/storage')()
admin.initializeApp(functions.config().firebase)
var FtpClient = require('ftp')
var fs = require('fs')
// [END import]
// [START Configs]
// Firebase Storage is configured with the following rules and grants read write access to everyone
/*
service firebase.storage {
match /b/{bucket}/o {
match /{allPaths=**} {
allow read, write;
}
}
}
*/
// Replace this with your project id, will be use by: const bucket = gcpStorage.bucket(firebaseProjectID)
const firebaseProjectID = 'your_project_id'
// Public FTP server, uploaded files are removed after 48 hours ! Upload new ones when needed for testing
const CONFIG = {
test_ftp: {
source_path: '/48_hour',
ftp: {
host: 'ftp.uconn.edu'
}
}
}
const SOURCE_FTP = CONFIG.test_ftp
// [END Configs]
// [START saveFTPFileWithFSCreateWriteStream]
function saveFTPFileWithFSCreateWriteStream(file_name) {
const ftpSource = new FtpClient()
ftpSource.on('ready', function() {
ftpSource.get(SOURCE_FTP.source_path + '/' + file_name, function(err, stream) {
if (err) throw err
stream.once('close', function() { ftpSource.end() })
stream.pipe(fs.createWriteStream(file_name))
console.log('File downloaded: ', file_name)
})
})
ftpSource.connect(SOURCE_FTP.ftp)
}
// This fails with the following error in firebase console:
// Error: EROFS: read-only file system, open '20170601.tar.gz' at Error (native)
// [END saveFTPFileWithFSCreateWriteStream]
// [START saveFTPFileWithBucketUpload]
function saveFTPFileWithBucketUpload(file_name) {
const bucket = gcpStorage.bucket(firebaseProjectID)
const file = bucket.file(file_name)
const ftpSource = new FtpClient()
ftpSource.on('ready', function() {
ftpSource.get(SOURCE_FTP.source_path + '/' + file_name, function(err, stream) {
if (err) throw err
stream.once('close', function() { ftpSource.end() })
stream.pipe(file.createWriteStream())
console.log('File downloaded: ', file_name)
})
})
ftpSource.connect(SOURCE_FTP.ftp)
}
// [END saveFTPFileWithBucketUpload]
// [START database triggers]
// Listens for new triggers added to /ftp_fs_triggers/:pushId and calls the saveFTPFileWithFSCreateWriteStream
// function to save the file in the default project storage bucket
exports.dbTriggersFSCreateWriteStream = functions.database
.ref('/ftp_fs_triggers/{pushId}')
.onWrite(event => {
const trigger = event.data.val()
const fileName = trigger.file_name // i.e. : trigger.file_name = '20170601.tar.gz'
return saveFTPFileWithFSCreateWriteStream(trigger.file_name)
// This fails with the following error in firebase console:
// Error: EROFS: read-only file system, open '20170601.tar.gz' at Error (native)
})
// Listens for new triggers added to /ftp_bucket_triggers/:pushId and calls the saveFTPFileWithBucketUpload
// function to save the file in the default project storage bucket
exports.dbTriggersBucketUpload = functions.database
.ref('/ftp_bucket_triggers/{pushId}')
.onWrite(event => {
const trigger = event.data.val()
const fileName = trigger.file_name // i.e. : trigger.file_name = '20170601.tar.gz'
return saveFTPFileWithBucketUpload(trigger.file_name)
// This fails with the following error in firebase console:
/*
Error: Uncaught, unspecified "error" event. ([object Object])
at Pumpify.emit (events.js:163:17)
at Pumpify.onerror (_stream_readable.js:579:12)
at emitOne (events.js:96:13)
at Pumpify.emit (events.js:188:7)
at Pumpify.Duplexify._destroy (/user_code/node_modules/@google-cloud/storage/node_modules/duplexify/index.js:184:15)
at /user_code/node_modules/@google-cloud/storage/node_modules/duplexify/index.js:175:10
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickDomainCallback (internal/process/next_tick.js:122:9)
*/
})
// [END database triggers]