def __download()

in ccmlib/repository.py [0:0]

• 34 lines of code
• 6 McCabe index (conditional complexity)

def __download(url, target, username=None, password=None, show_progress=False):
    if username is not None:
        password_mgr = urllib.request.HTTPPasswordMgrWithDefaultRealm()
        password_mgr.add_password(None, url, username, password)
        handler = urllib.request.HTTPBasicAuthHandler(password_mgr)
        opener = urllib.request.build_opener(handler)
        urllib.request.install_opener(opener)  # pylint: disable=E1121

    u = urllib.request.urlopen(url)
    f = open(target, 'wb')
    meta = u.info()
    file_size = int(meta.get("Content-Length"))
    common.info("Downloading {} to {} ({:.3f}MB)".format(url, target, float(file_size) / (1024 * 1024)))

    file_size_dl = 0
    block_sz = 8192
    status = None
    attempts = 0
    while file_size_dl < file_size:
        buffer = u.read(block_sz)
        if not buffer:
            attempts = attempts + 1
            if attempts >= 5:
                raise CCMError("Error downloading file (nothing read after {} attempts, downloded only {} of {} bytes)".format(attempts, file_size_dl, file_size))
            time.sleep(0.5 * attempts)
            continue
        else:
            attempts = 0

        file_size_dl += len(buffer)
        f.write(buffer)
        if show_progress:
            status = r"%10d  [%3.2f%%]" % (file_size_dl, file_size_dl * 100. / file_size)
            status = chr(8) * (len(status) + 1) + status
            print_(status, end='')

    f.close()
    u.close()