mirror of https://github.com/python/cpython
53 lines
1.4 KiB
Python
53 lines
1.4 KiB
Python
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"""Utilities related to the mirror infrastructure defined in PEP 381."""
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from string import ascii_lowercase
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import socket
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DEFAULT_MIRROR_URL = "last.pypi.python.org"
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def get_mirrors(hostname=None):
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"""Return the list of mirrors from the last record found on the DNS
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entry::
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>>> from packaging.pypi.mirrors import get_mirrors
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>>> get_mirrors()
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['a.pypi.python.org', 'b.pypi.python.org', 'c.pypi.python.org',
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'd.pypi.python.org']
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"""
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if hostname is None:
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hostname = DEFAULT_MIRROR_URL
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# return the last mirror registered on PyPI.
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try:
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hostname = socket.gethostbyname_ex(hostname)[0]
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except socket.gaierror:
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return []
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end_letter = hostname.split(".", 1)
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# determine the list from the last one.
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return ["%s.%s" % (s, end_letter[1]) for s in string_range(end_letter[0])]
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def string_range(last):
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"""Compute the range of string between "a" and last.
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This works for simple "a to z" lists, but also for "a to zz" lists.
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"""
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for k in range(len(last)):
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for x in product(ascii_lowercase, repeat=(k + 1)):
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result = ''.join(x)
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yield result
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if result == last:
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return
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def product(*args, **kwds):
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pools = [tuple(arg) for arg in args] * kwds.get('repeat', 1)
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result = [[]]
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for pool in pools:
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result = [x + [y] for x in result for y in pool]
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for prod in result:
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yield tuple(prod)
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