模塊化Multer功能問題

Question

我想通過模塊化我的multer模塊功能來清理我的控制器，這些功能允許我使用表單上傳多個文件。下面介紹的當前代碼可以工作，但我想將Muller函數放在一個新文件中。我認爲只是簡單地使用該函數並從另一個文件導出它可能會起作用，但由於某種原因，我在我的表單POST期間打了個時間，儘管在multer代碼的開頭調用了console.log。看起來代碼中的某些內容正在停止該進程，但不會引發錯誤消息。有沒有人看到可能導致錯誤的原因？

var aws = require('aws-sdk'); 
var multer = require('multer'); 
var multerS3 = require('multer-s3'); 
var moment = require('moment'); 

var uploadDate = new moment().format("YYYY-MM-DD"); 
var s3 = new aws.S3(); 
var options = { 
    Bucket: process.env.AWS_BUCKET, 
    Expires: 60 
}; 

if(app.get('env') === 'production' || app.get('env') === 'staging'){ 
    options.ACL = 'private' 
} else { 
    options.ACL = 'public-read' 
}; 

//////////Multer code being called 

var upload = multer({ 
    storage: multerS3({ 
     s3: s3, 
     bucket: options.Bucket, 
     contentType: multerS3.AUTO_CONTENT_TYPE, 
     acl: options.ACL, 
     key: function(req, file, cb){ 
      var fileNameFormatted = file.originalname.replace(/\s+/g, '-').toLowerCase(); 
      cb(null, req.session.organizationId + '/' + uploadDate + '/' + fileNameFormatted); 
     } 
    }), 
    fileFilter: function(req, file, cb){ 
     if(!file.originalname.match(/\.(jpg|jpeg|png|gif|csv|xls|xlsb|xlsm|xlsx)$/)){ 
      return cb('One of your selected files is not supported', false); 
     } 
     cb(null, true); 
    } 
}).array('fileUpload', 5); 

///////Post route calling multer and rest of form submission 

.post(function(req, res){ 

    upload(req, res, function(){ 
     if(err){ 
      console.log('Multer upload error'); 
      req.flash('error', err); 
      res.redirect(req.get('referer')); 
      return; 
     } 

     ... MORE CODE ... 
    }) 
}); 

/controllers/multer.js，其中包含multer代碼：

var express = require('express'); 
var app = express(); 
var aws = require('aws-sdk'); 
var multer = require('multer'); 
var multerS3 = require('multer-s3'); 
var moment = require('moment'); 

var s3 = new aws.S3(); 
var uploadDate = new moment().format("YYYY-MM-DD"); 

var options = { 
    Bucket: process.env.AWS_BUCKET, 
    Expires: 60, 
    //ContentType: req.query.file_type 
}; 

if(app.get('env') === 'production' || app.get('env') === 'staging'){ 
    options.ACL = 'private' 
} else { 
    options.ACL = 'public-read' 
}; 

module.exports = { 

    //Annotation file upload 
    annotationFileUpload: function(){ 
     multer({ 
      storage: multerS3({ 
       s3: s3, 
       bucket: options.Bucket, 
       contentType: multerS3.AUTO_CONTENT_TYPE, 
       acl: options.ACL, 
       key: function(req, file, cb){ 
        console.log("key called"); 
        var fileNameFormatted = file.originalname.replace(/\s+/g, '-').toLowerCase(); 
        cb(null, req.session.organizationId + '/' + uploadDate + '/' + fileNameFormatted); 
       } 
      }), 
      fileFilter: function(req, file, cb){ 
       console.log("file filter called"); 
       if(!file.originalname.match(/\.(jpg|jpeg|png|gif|csv|xls|xlsb|xlsm|xlsx)$/)){ 
        return cb('One of your selected files is not supported', false); 
       } 
       cb(null, true); 
      } 
     }).array('fileUpload', 5); 
    } 
} 

導入/controller/multer，並呼籲路線：

Multer路由文件中調用

var multerFile = require('./components/multer'); 

    .post(function(req, res){ 

    multerFile.annotationFileUpload(req, res, function(err){ 
       if(err){ 
        console.log('Multer upload error'); 
        req.flash('error', err); 
        res.redirect(req.get('referer')); 
        return; 
       } 
      ....MORE CODE.... 
     }) 
    }); 

Answer 1

您需要擺脫包裝函數，因爲multer()本身會返回中間件函數。它超時的原因是因爲你正在調用一個只創建中間件的函數，並立即丟棄它，然後不做任何事情（如響應請求）。

所以更改此設置：

annotationFileUpload: function(){ 
    multer({ 
     // ... 
    }).array('fileUpload', 5); 
} 

這樣：

annotationFileUpload: multer({ 
    // ... 
}).array('fileUpload', 5)