Django File Upload Progress - django

Question

I have used Django File Upload Progress process for getting progress but getting error pliks.upload" does not define a "UploadProgressCachedHandler" upload handler backend.
Steps i followed is
1) Create a folder upload and add file upload handler(UploadProgressCachedHandler.py) to it.
from django.core.files.uploadhandler import FileUploadHandler
from django.core.cache import cache
class UploadProgressCachedHandler(FileUploadHandler):
"""
Tracks progress for file uploads.
The http post request must contain a header or query parameter, 'X-Progress-ID'
which should contain a unique string to identify the upload to be tracked.
Copied from:
http://djangosnippets.org/snippets/678/
See views.py for upload_progress function...
"""
def __init__(self, request=None):
super(UploadProgressCachedHandler, self).__init__(request)
self.progress_id = None
self.cache_key = None
def handle_raw_input(self, input_data, META, content_length, boundary, encoding=None):
self.content_length = content_length
if 'X-Progress-ID' in self.request.GET :
self.progress_id = self.request.GET['X-Progress-ID']
elif 'X-Progress-ID' in self.request.META:
self.progress_id = self.request.META['X-Progress-ID']
if self.progress_id:
self.cache_key = "%s_%s" % (self.request.META['REMOTE_ADDR'], self.progress_id )
cache.set(self.cache_key, {
'length': self.content_length,
'uploaded' : 0
})
def new_file(self, field_name, file_name, content_type, content_length, charset=None):
pass
def receive_data_chunk(self, raw_data, start):
if self.cache_key:
data = cache.get(self.cache_key)
data['uploaded'] += self.chunk_size
cache.set(self.cache_key, data)
return raw_data
def file_complete(self, file_size):
pass
def upload_complete(self):
if self.cache_key:
cache.delete(self.cache_key)
2)Add the UploadProgressCachedHandler to your settings.py file:
from django.conf import global_settings
FILE_UPLOAD_HANDLERS = ('pliks.upload.UploadProgressCachedHandler', ) + \
global_settings.FILE_UPLOAD_HANDLERS
3)Add code to view.py
from django.core.cache import cache
from django.http import HttpResponse, HttpResponseServerError
def upload_progress(request):
"""
A view to report back on upload progress.
Return JSON object with information about the progress of an upload.
Copied from:
http://djangosnippets.org/snippets/678/
See upload.py for file upload handler.
"""
#import ipdb
#ipdb.set_trace()
progress_id = ''
if 'X-Progress-ID' in request.GET:
progress_id = request.GET['X-Progress-ID']
elif 'X-Progress-ID' in request.META:
progress_id = request.META['X-Progress-ID']
if progress_id:
from django.utils import simplejson
cache_key = "%s_%s" % (request.META['REMOTE_ADDR'], progress_id)
data = cache.get(cache_key)
return HttpResponse(simplejson.dumps(data))
else:
return HttpResponseServerError(
'Server Error: You must provide X-Progress-ID header or query param.')
4) Add url
url(r'^admin/upload_progress/$',
'utils.views.upload_progress',
name="admin-upload-progress"),
5) In template
{% block extra-head %}
<script type="text/javascript" >
// Generate 32 char random uuid
function gen_uuid() {
var uuid = ""
for (var i=0; i < 32; i++) {
uuid += Math.floor(Math.random() * 16).toString(16);
}
return uuid
}
// Add upload progress for multipart forms.
$(function() {
/*
This throws a syntax error...
$('form[#enctype=multipart/form-data]').submit(function(){
*/
$('#upload').submit(function(){
// Prevent multiple submits
if ($.data(this, 'submitted')) return false;
var freq = 1000; // freqency of update in ms
var uuid = gen_uuid(); // id for this upload so we can fetch progress info.
var progress_url = '/feature/admin/upload_progress/'; // ajax view serving progress info
// Append X-Progress-ID uuid form action
this.action += (this.action.indexOf('?') == -1 ? '?' : '&') + 'X-Progress-ID=' + uuid;
var $progress = $('<div id="upload-progress" class="upload-progress"></div>').
appendTo(document.body).append('<div class="progress-container"><span class="progress-info">uploading 0%</span><div class="progress-bar"></div></div>');
// progress bar position
$progress.css({
position: ($.browser.msie && $.browser.version < 7 )? 'absolute' : 'fixed',
left: '50%', marginLeft: 0-($progress.width()/2), bottom: '20%'
}).show();
// Update progress bar
function update_progress_info() {
$progress.show();
$.getJSON(progress_url, {'X-Progress-ID': uuid}, function(data, status){
if (data) {
var progress = parseInt(data.uploaded) / parseInt(data.length);
var width = $progress.find('.progress-container').width()
var progress_width = width * progress;
$progress.find('.progress-bar').width(progress_width);
$progress.find('.progress-info').text('uploading ' + parseInt(progress*100) + '%');
}
window.setTimeout(update_progress_info, freq);
});
};
window.setTimeout(update_progress_info, freq);
$.data(this, 'submitted', true); // mark form as submitted.
});
});
</script>
{% endblock %}
{% block content %}
<form id='upload' action="." enctype="multipart/form-data" method="POST">
<table>
{{ form.as_table }}
</table>
<p><input type="submit" value="Submit"></p>
</form>
{% endblock %}
Somewhere i got wrong....

Answer 1

You need to provide the class name of the handler, if your file is called UploadProgressCachedHandler.py you are providing the module name here. you would need to use
FILE_UPLOAD_HANDLERS = ('pliks.upload.UploadProgressCachedHandler.UploadProgressCachedHandler', ) + \
global_settings.FILE_UPLOAD_HANDLERS
Python convention would be to call the module handlers.py rather than name it after a class it contains.