def download()

in tools/ami-creator/scripts/win2019_cuda11_installer.py [0:0]

• 37 lines of code
• 15 McCabe index (conditional complexity)

def download(url, dest=None, progress=False) -> str:
    from urllib.request import urlopen
    from urllib.parse import (urlparse, urlunparse)
    import progressbar
    import http.client

    class ProgressCB():
        def __init__(self):
            self.pbar = None

        def __call__(self, block_num, block_size, total_size):
            if not self.pbar and total_size > 0:
                self.pbar = progressbar.bar.ProgressBar(max_value=total_size)
            downloaded = block_num * block_size
            if self.pbar:
                if downloaded < total_size:
                    self.pbar.update(downloaded)
                else:
                    self.pbar.finish()
    if dest and os.path.isdir(dest):
        local_file = os.path.split(urlparse(url).path)[1]
        local_path = os.path.normpath(os.path.join(dest, local_file))
    else:
        local_path = dest
    with urlopen(url) as c:
        content_length = c.getheader('content-length')
        length = int(content_length) if content_length and isinstance(c, http.client.HTTPResponse) else None
        if length and local_path and os.path.exists(local_path) and os.stat(local_path).st_size == length:
            log.debug(f"download('{url}'): Already downloaded.")
            return local_path
    log.debug(f"download({url}, {local_path}): downloading {length} bytes")
    if local_path:
        with tempfile.NamedTemporaryFile(delete=False) as tmpfd:
            urllib.request.urlretrieve(url, filename=tmpfd.name, reporthook=ProgressCB() if progress else None)
            shutil.move(tmpfd.name, local_path)
    else:
        (local_path, _) = urllib.request.urlretrieve(url, reporthook=ProgressCB())
    log.debug(f"download({url}, {local_path}'): done.")
    return local_path