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#!/usr/bin/env python3
# Copyright (c) 2020 VMware, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Breaks lines read from stdin into groups using blank lines as
# group separators, then sorts lines within the groups for
# reproducibility.
import re
import sys
# This is copied out of the Python Sorting HOWTO at
# https://docs.python.org/3/howto/sorting.html#sortinghowto
def cmp_to_key(mycmp):
'Convert a cmp= function into a key= function'
class K(object):
def __init__(self, obj, *args):
self.obj = obj
def __lt__(self, other):
return mycmp(self.obj, other.obj) < 0
def __gt__(self, other):
return mycmp(self.obj, other.obj) > 0
def __eq__(self, other):
return mycmp(self.obj, other.obj) == 0
def __le__(self, other):
return mycmp(self.obj, other.obj) <= 0
def __ge__(self, other):
return mycmp(self.obj, other.obj) >= 0
def __ne__(self, other):
return mycmp(self.obj, other.obj) != 0
return K
u = '[0-9a-fA-F]'
uuid_re = re.compile(r'%s{8}-%s{4}-%s{4}-%s{4}-%s{12}' % ((u,) * 5))
def cmp(a, b):
return (a > b) - (a < b)
def compare_lines(a, b):
if uuid_re.match(a):
if uuid_re.match(b):
return cmp(a[36:], b[36:])
else:
return 1
elif uuid_re.match(b):
return -1
else:
return cmp(a, b)
def output_group(group, dst):
for x in sorted(group, key=cmp_to_key(compare_lines)):
dst.write(x)
def ovsdb_monitor_sort(src, dst):
group = []
while True:
line = src.readline()
if not line:
break
if line.rstrip() == '':
output_group(group, dst)
group = []
dst.write(line)
elif line.startswith(',') and group:
group[len(group) - 1] += line
else:
group.append(line)
if group:
output_group(group, dst)
if __name__ == '__main__':
ovsdb_monitor_sort(sys.stdin, sys.stdout)
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