package_index.py 文件源码

def _download_to(self, url, filename):
        self.info("Downloading %s", url)
        # Download the file
        fp, info = None, None
        try:
            checker = HashChecker.from_url(url)
            fp = self.open_url(strip_fragment(url))
            if isinstance(fp, urllib.error.HTTPError):
                raise DistutilsError(
                    "Can't download %s: %s %s" % (url, fp.code, fp.msg)
                )
            headers = fp.info()
            blocknum = 0
            bs = self.dl_blocksize
            size = -1
            if "content-length" in headers:
                # Some servers return multiple Content-Length headers :(
                sizes = get_all_headers(headers, 'Content-Length')
                size = max(map(int, sizes))
                self.reporthook(url, filename, blocknum, bs, size)
            with open(filename, 'wb') as tfp:
                while True:
                    block = fp.read(bs)
                    if block:
                        checker.feed(block)
                        tfp.write(block)
                        blocknum += 1
                        self.reporthook(url, filename, blocknum, bs, size)
                    else:
                        break
                self.check_hash(checker, filename, tfp)
            return headers
        finally:
            if fp:
                fp.close()