Can I slow down Django

Question

Simple question really

./manage.py runserver

Can I slow down localhost:8000 on my development machine so I can simulate file uploa

Answer 1

depending on where you want to simulate such you could simply sleep?

from time import sleep
sleep(500)

Answer 2

Use the slow file upload handler from django-gubbins:

import time
from django.core.files.uploadhandler import FileUploadHandler

class SlowFileUploadHandler(FileUploadHandler):
    """
    This is an implementation of the Django file upload handler which will
    sleep between processing chunks in order to simulate a slow upload. This
    is intended for development when creating features such as an AJAXy
    file upload progress bar, as uploading to a local process is often too
    quick.
    """
    def receive_data_chunk(self, raw_data, start):
        time.sleep(2)
        return raw_data

    def file_complete(self, file_size):
        return None

You can either enable this globally, by adding it to:

FILE_UPLOAD_HANDLERS = (
    "myapp.files.SlowFileUploadHandler",
    "django.core.files.uploadhandler.MemoryFileUploadHandler",
    "django.core.files.uploadhandler.TemporaryFileUploadHandler",
)

Or enable it for a specific request:

request.upload_handlers.insert(0, SlowFileUploadHandler())

Make sure the request is excepted from CSRF checking, as mentioned at https://docs.djangoproject.com/en/dev/topics/http/file-uploads/#id1

Answer 3

I'm a big fan of the Charles HTTP Proxy. It lets you throttle the connection and can simulate all sorts of network conditions.

http://www.charlesproxy.com/

Answer 4

If you want to slow things down across all requests a very easy way to go would be to use ngrok https://ngrok.com/ . Use the ngrok url for requests then connect to a vpn in another country. That will make your requests really slow.

Answer 5

On osx or freebds, you can use ipfw to limit bandwidth on specific ports:

  sudo ipfw pipe 1 config bw 1Bytes/s delay 100ms
  sudo ipfw add 1 pipe 1 src-port 8000

Do not forget to delete it when you do not need it anymore:

sudo ipfw delete 1

Credit: jaguarcy

For osx there is also free app that will allow this:

http://slowyapp.com/

Answer 6

You could write a customized upload handler or subclass current upload handler to mainly slow down receive_data_chunk() method in it. Or set a pdb breakpoint inside receive_data_chunk() and manually proceed the uploading. Or even simpler, try to upload some large file.