Stockage du flux de données à partir de la requête POST dans GridFS, express, mongoDB, node.js

@robertklep réponse est bonne, je voudrais ajouter quelque chose à sa réponse. Ce code montre comment vous pouvez renvoyer les métadonnées du fichier stocké.

app.post('/picture', function(req, res) {
  req.pipe(gfs.createWriteStream({
    filename: 'test'
  }).on('close', function(savedFile){
    console.log('file saved', savedFile);
    return res.json({file: savedFile});
  }));
})  

cela a fonctionné pour moi avec mongoose:

 var gfs = Grid(mongoose.connection.db, mongoose.mongo);
    var writeStream = gfs.createWriteStream({
        filename: name,
        mode: 'w',
        content_type: 'video/mp4'
    });
    writeStream.on('close', function() {
        console.log('close event');
    });

    fs.createReadStream('uploads/' + name + '/' + name + '.mp4').pipe(writeStream);
    console.log('stream.write: ' + name + '/' + name + '.mp4');

j'ai du mal quelques jours à obtenir la vidéo sur le navigateur côté client. C'est ce que j'ai essayé jusqu'à présent:

var readstream = gfs.createReadStream({
        filename: file.filename
    });

    readstream.on('data', function(data) {
        res.write(data);
        console.log(data);
    });

    readstream.on('end', function() {
        res.end();        
    });

    readstream.on('error', function (err) {
        console.log('An error occurred!', err);
        throw err;
    });

Mes Données sur MongoDB côté ressemble à:

db.fs.morceau.trouver() {"_id": ObjectId ("5757e76df14741bf0391aaca"),"files_id": ObjectId ("5757e76df14741bf0391aac8"), "n" : 0,"data": BinData(0, " AAAAIGZ0eXBpc29....

Et le contentType est 'video / mp4':

journalisation sur navigateur côté imprime ceci:

Objet { 0: "�", 1: "�", 2: "�", 3: "", 4: "f", 5: "t", 6: "y", 7: "p", 8: "i", 9: "s", 85003 plus...}

code complet pour insérer le txtfile dans mongodb en utilisant gridfs dans nodejs.Cela fonctionne bien `

var mongoose=require("mongoose");
var gridfsstream=require("gridfs-stream");
var fs=require("fs");
mongoose.connect("mongodb://localhost:27017/testimage");
var conn=mongoose.connection;
gridfsstream.mongo=mongoose.mongo;
conn.once("open",function()
{
    console.log("database connected successfully");
    var gfs=gridfsstream(conn.db);
    var writestream=gfs.createWriteStream({
        filename:"danger.txt"
    });
    fs.createReadStream("sivakasi.txt").pipe(writestream);
    writestream.on("close",function(file)
    {
        console.log(file.filename +"stored successfully into mongodb using gridfs");
    });
    writestream.on("error",function(file)
    {
        console.log(file.filename +"not stored into mongodb using gridfs");
    });
});
conn.on("error",function()
{
    console.log("database not connected try again!!!");
});

`

Code complet pour afficher l'image de html à nodejs stocker cette image dans mongodb en utilisant le système gridfs et afficher cette image dans le serveur.Ce code fonctionne bien.

var express=require("express");
var bodyparser=require("body-parser");
var multer=require("multer");
var app=express();
var upload = multer({ dest: '/tmp/'});
app.use(bodyparser.urlencoded({extended:false}));
app.post("/uploadimage",upload.single("file"),function(request,response)
{
    var mongoose=require("mongoose");
    var gridfsstream=require("gridfs-stream");
    var fs=require("fs");
    mongoose.connect("mongodb://localhost:27017/testimage");
    var con=mongoose.connection;
    gridfsstream.mongo=mongoose.mongo;
    con.once("open",function()
    {
        console.log("test image database connected successfully");
        var gfs=gridfsstream(con.db);
        var readstream=fs.createReadStream(request.file.originalname);
        var writestream=gfs.createWriteStream({
            filename:"mentorpicthree.jpg"
        });
        readstream.pipe(writestream);
        writestream.on("close",function()
        {
            console.log("image stored in mongodb database successfully");
            fs.readFile(request.file.originalname,function(err,data)
            {
                if(err)
                {
                    response.writeHead(404,{"Content-Type":"text/plain"});
                    console.log("error");

                }
                else
                {
                        response.writeHead(200,{"Content-Type":"image/jpg"});
                        response.end(data);
                }
            });
        });
        writestream.on("error",function()
        {
            console.log("image not stored in mongodb database");
        });

    });
    con.on("error",function()
    {
        console.log("database not connected try again!!!");
    });

});
app.listen(8086,function()
{
    console.log("server running on port 8086");
});

<html>
<head>
    <title>FILE UPLOAD</title>
</head>
<body>
<p>Ryan Dhal</p>
<form action="http://127.0.0.1:8086/uploadimage" method="POST" enctype="multipart/form-data">
    <input type="file" name="file">
    <br>
    <input type="submit" value="UPLOAD">
</form>
</body>
</html>