78 lines
2.6 KiB
Python
78 lines
2.6 KiB
Python
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#!/usr/bin/env python3
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# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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"""IO utilities (adapted from Detectron)"""
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import logging
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import os
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import re
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import sys
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from urllib import request as urlrequest
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logger = logging.getLogger(__name__)
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_PYCLS_BASE_URL = "https://dl.fbaipublicfiles.com/pycls"
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def cache_url(url_or_file, cache_dir):
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"""Download the file specified by the URL to the cache_dir and return the path to
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the cached file. If the argument is not a URL, simply return it as is.
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"""
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is_url = re.match(r"^(?:http)s?://", url_or_file, re.IGNORECASE) is not None
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if not is_url:
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return url_or_file
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url = url_or_file
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err_str = "pycls only automatically caches URLs in the pycls S3 bucket: {}"
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assert url.startswith(_PYCLS_BASE_URL), err_str.format(_PYCLS_BASE_URL)
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cache_file_path = url.replace(_PYCLS_BASE_URL, cache_dir)
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if os.path.exists(cache_file_path):
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return cache_file_path
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cache_file_dir = os.path.dirname(cache_file_path)
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if not os.path.exists(cache_file_dir):
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os.makedirs(cache_file_dir)
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logger.info("Downloading remote file {} to {}".format(url, cache_file_path))
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download_url(url, cache_file_path)
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return cache_file_path
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def _progress_bar(count, total):
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"""Report download progress. Credit:
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https://stackoverflow.com/questions/3173320/text-progress-bar-in-the-console/27871113
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"""
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bar_len = 60
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filled_len = int(round(bar_len * count / float(total)))
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percents = round(100.0 * count / float(total), 1)
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bar = "=" * filled_len + "-" * (bar_len - filled_len)
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sys.stdout.write(
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" [{}] {}% of {:.1f}MB file \r".format(bar, percents, total / 1024 / 1024)
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)
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sys.stdout.flush()
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if count >= total:
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sys.stdout.write("\n")
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def download_url(url, dst_file_path, chunk_size=8192, progress_hook=_progress_bar):
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"""Download url and write it to dst_file_path. Credit:
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https://stackoverflow.com/questions/2028517/python-urllib2-progress-hook
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"""
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req = urlrequest.Request(url)
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response = urlrequest.urlopen(req)
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total_size = response.info().get("Content-Length").strip()
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total_size = int(total_size)
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bytes_so_far = 0
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with open(dst_file_path, "wb") as f:
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while 1:
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chunk = response.read(chunk_size)
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bytes_so_far += len(chunk)
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if not chunk:
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break
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if progress_hook:
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progress_hook(bytes_so_far, total_size)
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f.write(chunk)
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return bytes_so_far
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