MongoDB GridFS"非法块格式"异常

Question

我一直在Node.js中编写一个应用程序,用于在MongoDB的GridFS文件系统中存储图像.

我通过应用程序上传了图片,图片似乎存储正确:

$ mongofiles -v -d speaker-karaoke get howard-basement-100x115.jpg
Tue Jul 17 12:14:16 creating new connection to:127.0.0.1
Tue Jul 17 12:14:16 BackgroundJob starting: ConnectBG
Tue Jul 17 12:14:16 connected connection!
connected to: 127.0.0.1
done write to: howard-basement-100x115.jpg

这抓住了MongoDB中的.jpg,我能够打开它没问题,所以看起来我上传的内容正确存储.

但是,在我正在运行的应用程序中,当我尝试读取同一个文件时,我得到:

12:15:44 web.1     | started with pid 89621
12:15:45 web.1     | Connecting to mongodb://localhost/speaker-karaoke
12:15:45 web.1     | Speaker Karaoke express app started on 5000
12:15:48 web.1     | DEBUG: Get review thumbnail for 5005b7550333650000000001
12:15:48 web.1     | 
12:15:48 web.1     | node.js:201
12:15:48 web.1     |         throw e; // process.nextTick error, or 'error' event on first tick
12:15:48 web.1     |               ^
12:15:48 web.1     | Error: Illegal chunk format
12:15:48 web.1     |     at Error (unknown source)
12:15:48 web.1     |     at new <anonymous> (/Users/hlship/workspaces/github/speaker-karaoke/node_modules/mongodb/lib/mongodb/gridfs/chunk.js:43:11)
12:15:48 web.1     |     at /Users/hlship/workspaces/github/speaker-karaoke/node_modules/mongodb/lib/mongodb/gridfs/gridstore.js:488:24
12:15:48 web.1     |     at Cursor.nextObject (/Users/hlship/workspaces/github/speaker-karaoke/node_modules/mongoose/node_modules/mongodb/lib/mongodb/cursor.js:462:5)
12:15:48 web.1     |     at [object Object].<anonymous> (/Users/hlship/workspaces/github/speaker-karaoke/node_modules/mongoose/node_modules/mongodb/lib/mongodb/cursor.js:456:12)
12:15:48 web.1     |     at [object Object].g (events.js:156:14)
12:15:48 web.1     |     at [object Object].emit (events.js:88:20)
12:15:48 web.1     |     at Db._callHandler (/Users/hlship/workspaces/github/speaker-karaoke/node_modules/mongoose/node_modules/mongodb/lib/mongodb/db.js:1290:25)
12:15:48 web.1     |     at /Users/hlship/workspaces/github/speaker-karaoke/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:329:30
12:15:48 web.1     |     at [object Object].parseBody (/Users/hlship/workspaces/github/speaker-karaoke/node_modules/mongoose/node_modules/mongodb/lib/mongodb/responses/mongo_reply.js:118:5)
12:15:48 web.1     | process terminated
12:15:48 system    | sending SIGTERM to all processes

使用此代码(CoffeeScript,for Express):

  app.get "/images/review-thumbnail/:id", (req, res) ->

    id = req.params.id

    util.debug "Get review thumbnail for #{id}"

    store = new GridStore mongoose.connection.db, new ObjectID(id), null, "r"

    store.open (err, file) ->

      throw err if err

      util.debug "Store open for #{id}, type = #{file.contentType}"

      # TODO: Scale the image before sending it!

      res.header "Content-Type", file.contentType

      store.stream(true).pipe res

所以它似乎没有将它传递给传递给store.open()的回调.

当您知道id而不是文件名时打开GridFS文件是否有问题？

BTW:

$ npm ls
speaker-karaoki@0.0.1 /Users/hlship/workspaces/github/speaker-karaoke
??? blueimp-file-upload-node@1.0.2  extraneous
? ??? formidable@1.0.11 
? ??? imagemagick@0.1.2 
? ??? node-static@0.6.0 
??? coffee-script@1.3.3 
??? connect-assets@2.1.9 
? ??? connect-file-cache@0.2.4 
? ??? mime@1.2.2 
? ??? snockets@1.3.4 
? ? ??? coffee-script@1.3.3 
? ? ??? dep-graph@1.0.1 
? ? ??? uglify-js@1.0.7 
? ??? underscore@1.1.7 
??? express@2.5.9 
? ??? connect@1.9.1 
? ? ??? formidable@1.0.11 
? ??? mime@1.2.4 
? ??? mkdirp@0.3.0 
? ??? qs@0.4.2 
??? jade@0.26.0 
? ??? commander@0.5.2 
? ??? mkdirp@0.3.0 
??? mongodb@1.0.2 
? ??? bson@0.0.6 
??? mongoose@2.7.0 
? ??? hooks@0.2.1 
? ??? mongodb@1.0.2 
?   ??? bson@0.0.6 
??? passport@0.1.10 
? ??? pkginfo@0.2.3 
??? passport-twitter@0.1.3 
? ??? passport-oauth@0.1.9 
? ? ??? oauth@0.9.7 
? ? ??? passport@0.1.11 
? ??? pkginfo@0.2.3 
??? sass@0.5.0 
??? underscore@1.3.3 

这是失败的功能:

var Chunk = exports.Chunk = function(file, mongoObject) {
  if(!(this instanceof Chunk)) return new Chunk(file, mongoObject);

  this.file = file;
  var self = this;
  var mongoObjectFinal = mongoObject == null ? {} : mongoObject;

  this.objectId = mongoObjectFinal._id == null ? new ObjectID() : mongoObjectFinal._id;
  this.chunkNumber = mongoObjectFinal.n == null ? 0 : mongoObjectFinal.n;
  this.data = new Binary();

  if(mongoObjectFinal.data == null) {
  } else if(typeof mongoObjectFinal.data == "string") {
    var buffer = new Buffer(mongoObjectFinal.data.length);
    buffer.write(mongoObjectFinal.data, 'binary', 0);
    this.data = new Binary(buffer);
  } else if(Array.isArray(mongoObjectFinal.data)) {
    var buffer = new Buffer(mongoObjectFinal.data.length);
    buffer.write(mongoObjectFinal.data.join(''), 'binary', 0);
    this.data = new Binary(buffer);
  } else if(mongoObjectFinal.data instanceof Binary || Object.prototype.toString.call(mongoObjectFinal.data) == "[object Binary]") {    
    this.data = mongoObjectFinal.data;
  } else if(Buffer.isBuffer(mongoObjectFinal.data)) {
  } else {
    throw Error("Illegal chunk format");
  }
  // Update position
  this.internalPosition = 0;
};

解

在此处更新解决方案,因为它在下面的注释中无法正确呈现.

问题是重复; mongodb和bson有两份,即使版本相同.

幸运的是,mongoose将它需要的mongodb导出为属性mongo,所以我能够从我的mundodb中删除package.json并更改:

mongo = require "mongodb"
mongoose = require "mongoose"

至:

mongoose = require "mongoose"
mongo = mongoose.mongo

事情现在看起来不错; 我仍然认为模块系统需要一种受制裁的方式来访问依赖项依赖项(对于dep不够周到以暴露其deps的情况).

Answer 1

很确定它是 mongodb 模块的重复副本（相同版本）；删除 node_modules 和 nmp install 似乎已经修复了它。