package_index.py 文件源码

def _download_to(self, url, filename):
        self.info("Downloading %s", url)
        # Download the file
        fp, tfp, info = None, None, None
        try:
            checker = HashChecker.from_url(url)
            fp = self.open_url(strip_fragment(url))
            if isinstance(fp, 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)
            tfp = open(filename,'wb')
            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()
            if tfp: tfp.close()