use mongoose-gridfs npm for file upload to gridfs storage

src/server/service/file-uploader/gridfs.js

@@ -8,57 +8,33 @@ module.exports = function(crowi) {
   var mongoose = require('mongoose');
   var gridfs = require('gridfs-stream');
   var path = require('path');
-  var basePath = path.posix.join(crowi.publicDir, 'uploads'); // TODO: to configurable
-
   var lib = {};
+  var AttachmentFile = {};
 
-  mongoose.connect('mongodb://localhost/growi', {
-    useNewUrlParser: true
+  // instantiate mongoose-gridfs
+  var gridfs = require('mongoose-gridfs')({
+    collection: 'attachments',
+    model: 'AttachmentFile',
+    mongooseConnection: mongoose.connection
   });
-  mongoose.Promise = global.Promise;
-  gridfs.mongo = mongoose.mongo;
-  var connection = mongoose.connection;
-  connection.on('error', console.error.bind(console, 'connection error:'));
 
+  // obtain a model
+  AttachmentFile= gridfs.model;
+
+  // create or save a file
   lib.uploadFile = function (filePath, contentType, fileStream, options) {
-    debug('File uploading: ' + filePath);
     return new Promise(function (resolve, reject) {
-      // connection.once('open', function () {
-      var gfs = gridfs(connection.db);
-
-      // Writing a file from local to MongoDB
-      var writestream = gfs.createWriteStream({ filename: 'test.jpg' });
-      fs.createReadStream(filePath).pipe(writestream);
-      writestream.on('close', function (file) {
-        resolve(file);
+      AttachmentFile.write({
+        filename: 'test1.jpg',
+        contentType: contentType
+      },
+      fs.createReadStream(fileStream.path),
+      function (error, createdFile) {
+        debug('Failed to upload ' + createdFile + 'to gridFS', error);
+        resolve(createdFile);
       });
     });
-    // });
   };
-  // // mongoose connect
-  // mongoose.connect('mongodb://localhost/test');
-
-  // // instantiate mongoose-gridfs
-  // var gridfs = require('mongoose-gridfs')({
-  //   collection: 'attachments',
-  //   model: 'Attachment',
-  //   mongooseConnection: mongoose.connection
-  // });
-
-  // // obtain a model
-  // Attachment = gridfs.model;
-
-  // // create or save a file
-  // lib.uploadFile = function (filePath, contentType, fileStream, options) {
-  //   Attachment.write({
-  //     filePath: filePath,
-  //     contentType: contentType
-  //   },
-  //     fs.createReadStream(fileStream.path),
-  //     function (error, createdFile) {
-  //       debug('Failed to upload ' + createdFile + 'to gridFS', error);
-  //     });
-  // };
 
   // for larger file size
   // read a file and receive a stream
@@ -74,6 +50,7 @@ module.exports = function(crowi) {
   // Attachment.unlinkById(objectid, function (error, unlinkedAttachment) {
   //   debug('Failed to remove ' + unlinkedAttachment + 'in gridFS', error);
   // });
+
   lib.generateUrl = function (filePath) {
     return path.posix.join('/uploads', filePath);
   };