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""" Miscellaneous useful utility functions, classes, etc., that are
used by both client and server. Stuff that doesn't fit anywhere
else. """
import fcntl
from Bcfg2.Compat import any # pylint: disable=W0622
class PackedDigitRange(object):
""" Representation of a set of integer ranges. A range is
described by a comma-delimited string of integers and ranges,
e.g.::
1,10-12,15-20
Ranges are inclusive on both bounds, and may include 0. Negative
numbers are not supported."""
def __init__(self, *ranges):
""" May be instantiated in one of two ways::
PackedDigitRange(<comma-delimited list of ranges>)
Or::
PackedDigitRange(<int_or_range>[, <int_or_range>[, ...]])
E.g., both of the following are valid::
PackedDigitRange("1-5,7, 10-12")
PackedDigitRange("1-5", 7, "10-12")
"""
self.ranges = []
self.ints = []
self.str = ",".join(str(r) for r in ranges)
if len(ranges) == 1 and "," in ranges[0]:
ranges = ranges[0].split(",")
for item in ranges:
item = str(item).strip()
if item.endswith("-"):
self.ranges.append((int(item[:-1]), None))
elif '-' in str(item):
self.ranges.append(tuple(int(x) for x in item.split('-')))
else:
self.ints.append(int(item))
def includes(self, other):
""" Return True if ``other`` is included in this range.
Functionally equivalent to ``other in range``, which should be
used instead. """
return other in self
def __contains__(self, other):
other = int(other)
if other in self.ints:
return True
return any((end is None and other >= start) or
(end is not None and other >= start and other <= end)
for start, end in self.ranges)
def __repr__(self):
return "%s:%s" % (self.__class__.__name__, str(self))
def __str__(self):
return "[%s]" % self.str
def __len__(self):
return sum(r[1] - r[0] + 1 for r in self.ranges) + len(self.ints)
def locked(fd):
""" Acquire a lock on a file """
try:
fcntl.lockf(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
except IOError:
return True
return False
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