Got some problem with uploading images to heroku server, on localhost everything work great. But on heroku when I upload image, it looks that all goes well but after refreshing the page I got a error message 404 (Not Found) so it seems that it doesn't uploaded.
Here is my code
var express = require('express'),
app = express(),
server = app.listen(process.env.PORT || 5000),
fs = require('fs-extra'),
im = require('imagemagick'),
util = require('util'),
formidable = require('formidable');
app.post('/upload', function (req, res){
var form = new formidable.IncomingForm();
// show respond
form.parse(req, function(err, fields, files) {
res.writeHead(200, {'content-type': 'text/plain'});
res.write('received upload:\n\n');
console.log(fields + ' ' + files);
res.end(util.inspect({fields: fields, files: files}));
});
form.on('end', function(fields, files) {
var that = this;
// temporary storage of image
var temp_path = that.openedFiles[0].path;
// uploaded image name
var file_name = that.openedFiles[0].name;
var dirpath = __dirname + '/app';
var opt = {
thumb : {
width: 150,
height: 150,
dest: '/uploads/thumbnails/'
},
original : {
dest : '/uploads/original/'
}
};
// get extension of image
var extension;
(function(type) {
if (type == 'image/jpeg' || type == 'image/jpg') {
extension = '.jpg';
} else if (type == 'image/png') {
extension = '.png';
}
})(that.openedFiles[0].type);
fs.copy(temp_path, dirpath + opt.original.dest + id + extension, function(err) {
if (err) {
console.error(err);
} else {
// thumbnails
im.crop({
srcPath: dirpath + opt.original.dest + id + extension,
dstPath: dirpath + opt.thumb.dest + id + extension,
width: opt.thumb.width,
height: opt.thumb.height,
quality: 1,
gravity: 'Center'
}, function (err, stdout, stderr){
if (err) {console.log('Thumbnail is not generated')}
else {
}
});
}
});
});
});
Where could be a problem?
In a cloud environment you should never upload images to the instance itself. Always use a central storage like for example S3 to store your uploaded files.
When you develop in a cloud environment you should always keep in mind that the current box you are running your code will only live for a certain amount of time (minutes, hours). So if the instances goes down you'll lose all your uploaded files.
Another problem can occur when you for example have 2 instances and your user uploads an image to instace x. Now when a second user tries to view the image but the load balancer will sent the request to instance y the image is not found because it doesn't exist on that instance.
For debugging your script I would add some more logging. Then in Heroku you could use :
heroku logs -t -a appname
to watch the logs of your application.
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