我正在升级到Sails.js
版本0.10,现在需要使用Skipper来管理我的文件上传.
当我上传文件时,我使用UUID为它生成一个新名称,并将其保存在public/files /文件夹中(当我将这一切全部工作时会改变,但现在测试很好)
我将原始名称和上传的名称+路径保存到Mongo数据库中.
这一切都非常简单,Sails v0.9.x
但使用Skipper
我无法弄清楚如何读取新的文件名和路径.(显然,如果我能读到我可以构建路径的名称,那么它实际上只是我需要的名称)
我的控制器看起来像这样
var uuid = require('node-uuid'), path = require('path'), blobAdapter = require('skipper-disk'); module.exports = { upload: function(req, res) { var receiver = blobAdapter().receive({ dirname: sails.config.appPath + "/public/files/", saveAs: function(file) { var filename = file.filename, newName = uuid.v4() + path.extname(filename); return newName; } }), results = []; req.file('docs').upload(receiver, function (err, files) { if (err) return res.serverError(err); async.forEach(files, function(file, next) { Document.create({ name: file.filename, size: file.size, localName: // ***** how do I get the `saveAs()` value from the uploaded file *****, path: // *** and likewise how do i get the path ****** }).exec(function(err, savedFile){ if (err) { next(err); } else { results.push({ id: savedFile.id, url: '/files/' + savedFile.localName }); next(); } }); }, function(err){ if (err) { sails.log.error('caught error', err); return res.serverError({error: err}); } else { return res.json({ files: results }); } }); }); }, _config: {} };
我该怎么做呢?
我现在已经解决了这个问题,并且认为我会分享我的解决方案,以帮助那些在类似问题上苦苦挣扎的人.
解决方案是根本不使用skipper-disk
,而是编写我自己的自定义receiver
.我把它创建为一个Sails Service
对象.
所以在档案中 api/services/Uploader.js
// Uploader utilities and helper methods // designed to be relatively generic. var fs = require('fs'), Writable = require('stream').Writable; exports.documentReceiverStream = function(options) { var defaults = { dirname: '/dev/null', saveAs: function(file){ return file.filename; }, completed: function(file, done){ done(); } }; // I don't have access to jQuery here so this is the simplest way I // could think of to merge the options. opts = defaults; if (options.dirname) opts.dirname = options.dirname; if (options.saveAs) opts.saveAs = options.saveAs; if (options.completed) opts.completed = options.completed; var documentReceiver = Writable({objectMode: true}); // This `_write` method is invoked each time a new file is received // from the Readable stream (Upstream) which is pumping filestreams // into this receiver. (filename === `file.filename`). documentReceiver._write = function onFile(file, encoding, done) { var newFilename = opts.saveAs(file), fileSavePath = opts.dirname + newFilename, outputs = fs.createWriteStream(fileSavePath, encoding); file.pipe(outputs); // Garbage-collect the bytes that were already written for this file. // (called when a read or write error occurs) function gc(err) { sails.log.debug("Garbage collecting file '" + file.filename + "' located at '" + fileSavePath + "'"); fs.unlink(fileSavePath, function (gcErr) { if (gcErr) { return done([err].concat([gcErr])); } else { return done(err); } }); }; file.on('error', function (err) { sails.log.error('READ error on file ' + file.filename, '::', err); }); outputs.on('error', function failedToWriteFile (err) { sails.log.error('failed to write file', file.filename, 'with encoding', encoding, ': done =', done); gc(err); }); outputs.on('finish', function successfullyWroteFile () { sails.log.debug("file uploaded") opts.completed({ name: file.filename, size: file.size, localName: newFilename, path: fileSavePath }, done); }); }; return documentReceiver; }
然后我controller
刚刚成为(在api/controllers/DocumentController.js
)
var uuid = require('node-uuid'), path = require('path'); module.exports = { upload: function(req, res) { var results = [], streamOptions = { dirname: sails.config.appPath + "/public/files/", saveAs: function(file) { var filename = file.filename, newName = uuid.v4() + path.extname(filename); return newName; }, completed: function(fileData, next) { Document.create(fileData).exec(function(err, savedFile){ if (err) { next(err); } else { results.push({ id: savedFile.id, url: '/files/' + savedFile.localName }); next(); } }); } }; req.file('docs').upload(Uploader.documentReceiverStream(streamOptions), function (err, files) { if (err) return res.serverError(err); res.json({ message: files.length + ' file(s) uploaded successfully!', files: results }); } ); }, _config: {} };
我相信它可以进一步改进,但这对我来说非常合适.