Question

I am downloading files over http and displaying the progress using urllib and the following code – which works fine:

import sys
from urllib import urlretrieve

urlretrieve('http://example.com/file.zip', '/tmp/localfile', reporthook=dlProgress)

def dlProgress(count, blockSize, totalSize):
  percent = int(count*blockSize*100/totalSize)
  sys.stdout.write("\r" + "progress" + "...%d%%" % percent)
  sys.stdout.flush()

Now I would also like to restart the download if it is going too slow (say less than 1MB in 15 seconds). How can I achieve this?

Answer 1

This should work.
It calculates the actual download rate and aborts if it is too low.

import sys
from urllib import urlretrieve
import time

url = "http://www.python.org/ftp/python/2.7.3/Python-2.7.3.tgz" # 14.135.620 Byte
startTime = time.time()

class TooSlowException(Exception):
    pass

def convertBToMb(bytes):
    """converts Bytes to Megabytes"""
    bytes = float(bytes)
    megabytes = bytes / 1048576
    return megabytes


def dlProgress(count, blockSize, totalSize):
    global startTime

    alreadyLoaded = count*blockSize
    timePassed = time.time() - startTime
    transferRate = convertBToMb(alreadyLoaded) / timePassed # mbytes per second
    transferRate *= 60 # mbytes per minute

    percent = int(alreadyLoaded*100/totalSize)
    sys.stdout.write("\r" + "progress" + "...%d%%" % percent)
    sys.stdout.flush()

    if transferRate < 4 and timePassed > 2: # download will be slow at the beginning, hence wait 2 seconds
        print "\ndownload too slow! retrying..."
        time.sleep(1) # let's not hammer the server
        raise TooSlowException

def main():
    try:
        urlretrieve(url, '/tmp/localfile', reporthook=dlProgress)

    except TooSlowException:
        global startTime
        startTime = time.time()
        main()

if __name__ == "__main__":
    main()