[SOLVED] PycURL RESUME

PycURL RESUME_FROM

I can't seem to get the RESUME_FROM option to work. Here's some example code that I have been testing with:

import os
import pycurl
import sys

def progress(total, existing, upload_t, upload_d):
    try:
        frac = float(existing)/float(total)
    except:
        frac = 0
    sys.stdout.write("\r%s %3i%%" % ("file", frac*100)  )

url = "http://launchpad.net/keryx/stable/0.92/+download/keryx_0.92.4.tar.gz"
filename = url.split("/")[-1].strip()

def test(debug_type, debug_msg):
    print "debug(%d): %s" % (debug_type, debug_msg)

c = pycurl.Curl()
c.setopt(pycurl.URL, url)
c.setopt(pycurl.FOLLOWLOCATION, 1)
c.setopt(pycurl.MAXREDIRS, 5)

# Setup writing
if os.path.exists(filename):
    f = open(filename, "ab")
    c.setopt(pycurl.RESUME_FROM, os.path.getsize(filename))
else:
    f = open(filename, "wb")
c.setopt(pycurl.WRITEDATA, f)

#c.setopt(pycurl.VERBOSE, 1)
c.setopt(pycurl.DEBUGFUNCTION, test)
c.setopt(pycurl.NOPROGRESS, 0)
c.setopt(pycurl.PROGRESSFUNCTION, progress)
c.perform()

Solution

It was actually resuming properly, however it appeared to be starting from the beginning again because the length from os.path.getsize(filename) was not added to existing in the progress function. Just a minor mistake! :)