Question

一直在努力让网格（mongodb）在节点中工作，而且我要以完全错误的方式处理它，或者网格系统并不是那么稳定。尝试了三种不同的解决方案，现在决定我将尝试使用gridfs-stream（如果没有人知道更好的解决方案。）

我认为我几乎已经开始工作了。但它只是挂在文件上（我认为）

    var mongoose = require("mongoose");
    var fs = require("fs");
    var mongo = require('mongodb');
    var Grid = require('gridfs-stream');


    mongoose.connect('mongodb://localhost:27017/BabySounds');


    function loadFile(dataCollection, cuID, file){
        console.log("Will create id " + cuID + " in the collection " + dataCollection + " and store " + file);
        var gfs = new Grid(mongoose.connection.db, mongoose.mongo);
        var writeStream = gfs.createWriteStream({
            mode: 'w',
            _id: cuID
        });
        fs.createReadStream(file).pipe(writeStream);
        writeStream.on('close', function (filen) {
            console.log('Written file ' + filen.name);
        });



    }
loadFile( 'fsSound', cuSoundID, srcSound);

但是，如果你运行上面的代码，它就会创建文件，但是（据我所知）永远不会得到关闭语句writeStream.on('close',

=======更新=======

更新了代码以添加尽可能多的测试。

    var mongoose = require("mongoose");
var fs = require("fs");
var mongo = require('mongodb');
var Grid = require('gridfs-stream');


mongoose.connect('mongodb://localhost:27017/BabySounds');
var db = mongoose.connection;


function loadFile(dataCollection, cuID, file){
    console.log("Will create id " + cuID + " in the collection " + dataCollection + " and store " + file);
    var gfs = new Grid(mongoose.connection.db, mongoose.mongo);
    db.on('error', function(err){
        console.log('Got the following mongoose error: '+ err);
    });
    db.once('connected', function (condata) {
        console.log('The bloody database is open!');
        var writeStream = gfs.createWriteStream({
            mode: 'w',
            _id: cuID
        });
        console.log('And now lets write the thing');
        readStream = fs.createReadStream(file);
        readStream.pipe(writeStream);
        writeStream.on('data', function (chunk){
            console.log('Writing some data, just dont know what');
        });
        writeStream.on('end', function (filen) {
            console.log('Written file ' + filen.name);
        });
        writeStream.on('error', function (err) {
           console.log('Got the following error: ' + err);
        });

    });


}

我仍然遇到同样的问题，它等待数据库连接，连接没有错误，但查看输出（有一些其他代码获取文件名，设置集合并生成uID，它并行执行两个，但是，将它设置为只做一个没有区别）

Will create id 553f39448c80bd9e7e6d904e in the collection fsImage and store ./data/kick.jpg
Will create id 553f39448c80bd9e7e6d904f in the collection fsSound and store ./data/kick-808.wav
The bloody database is open!
And now lets write the thing
The bloody database is open!
And now lets write the thing

还没有开始写作

Answer 1

经过多次摆弄，以及人们比我更好的帮助，问题被发现了。 writeStream不会发出“结束”，只会发出“结束”，因此要修改代码，所有必须更改的内容都是

writeStream.on('end', function (filen) {
    console.log('Written file ' + filen.name);
});

要

writeStream.on('finish', function (filen) {
    console.log('Written file ' + filen.name);
});

Answer 2

writeStream.on('close', function (file){ console.log(file.filename, 'write to database'); });

文件集合中的文件名是（filename）not（name）。并使用关闭事件

将流写入gridfs-stream

2 个答案: