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# Copyright (C) 2013-2014 eNovance SAS <licensing@enovance.com>
#
# 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.
"""Generate range of values according to a model."""
import re
import types
_PREFIX = None
def _generate_range(num_range):
"""Generate number for range specified like 10-12:20-30."""
for rang in num_range.split(':'):
boundaries = rang.split('-')
if len(boundaries) == 2:
try:
if boundaries[0][0] == '0':
fmt = '%%0%dd' % len(boundaries[0])
else:
fmt = '%d'
start = int(boundaries[0])
stop = int(boundaries[1]) + 1
if stop > start:
step = 1
else:
step = -1
stop = stop - 2
for res in range(start, stop, step):
yield fmt % res
except ValueError:
yield num_range
else:
yield num_range
_RANGE_REGEXP = re.compile(r'^(.*?)([0-9]+-[0-9]+(:([0-9]+-[0-9]+))*)(.*)$')
_IPV4_RANGE_REGEXP = re.compile(r'^[0-9:\-.]+$')
def _generate_values(pattern, prefix=_PREFIX):
"""Create a generator for ranges of IPv4 or names.
Ranges are defined like 10-12:15-18 or from a list of entries.
"""
if isinstance(pattern, list):
for elt in pattern:
yield elt
elif isinstance(pattern, dict):
pattern_copy = pattern.copy()
for key, entry in pattern_copy.items():
if not prefix or key[0] == prefix:
if prefix:
pattern[key[1:]] = _generate_values(entry)
else:
pattern[key] = _generate_values(entry)
del pattern[key]
else:
pattern[key] = entry
while True:
yield pattern
elif isinstance(pattern, str):
parts = pattern.split('.')
if (_IPV4_RANGE_REGEXP.search(pattern)
and len(parts) == 4
and (pattern.find(':') != -1 or pattern.find('-') != -1)):
gens = [_generate_range(part) for part in parts]
for part0 in gens[0]:
for part1 in gens[1]:
for part2 in gens[2]:
for part3 in gens[3]:
yield '.'.join((part0, part1, part2, part3))
gens[3] = _generate_range(parts[3])
gens[2] = _generate_range(parts[2])
gens[1] = _generate_range(parts[1])
else:
res = _RANGE_REGEXP.search(pattern)
if res:
head = res.group(1)
foot = res.group(res.lastindex)
for num in _generate_range(res.group(2)):
yield head + num + foot
else:
for _ in range(16387064):
yield pattern
else:
for _ in range(16387064):
yield pattern
STRING_TYPE = type('')
GENERATOR_TYPE = types.GeneratorType
def _call_nexts(model):
"""Walk through the model to call next() on all generators."""
entry = {}
generated = False
for key in model.keys():
if isinstance(model[key], GENERATOR_TYPE):
entry[key] = next(model[key])
generated = True
elif isinstance(model[key], dict):
entry[key] = _call_nexts(model[key])
else:
entry[key] = model[key]
# We can have nested generators so call again
if generated:
return _call_nexts(entry)
return entry
def generate(model, prefix=_PREFIX):
"""Generate a list of dict according to a model.
Ipv4 ranges are handled by _generate_ip.
"""
# Safe guard for models without ranges
for value in model.values():
if type(value) != STRING_TYPE:
break
elif _RANGE_REGEXP.search(value):
break
else:
return [model]
# The model has at least one range starting from here
result = []
yielded = {}
yielded.update(model)
yielded_copy = yielded.copy()
for key, value in yielded_copy.items():
if not prefix or key[0] == prefix:
if prefix:
yielded[key[1:]] = _generate_values(value, prefix)
del yielded[key]
else:
if isinstance(value, str) and not _RANGE_REGEXP.search(value):
yielded[key] = value
else:
yielded[key] = _generate_values(value, prefix)
else:
yielded[key] = value
while True:
try:
result.append(_call_nexts(yielded))
except StopIteration:
break
return result
def generate_dict(model, prefix=_PREFIX):
"""Generate a dict with ranges in keys and values."""
result = {}
for thekey in model.keys():
if not prefix or thekey[0] == prefix:
if prefix:
key = thekey[1:]
else:
key = thekey
for newkey, val in zip(list(_generate_values(key, prefix)),
generate(model[thekey], prefix)):
try:
result[newkey] = merge(result[newkey], val)
except KeyError:
result[newkey] = val
else:
key = thekey
try:
result[key] = merge(result[key], model[key])
except KeyError:
result[key] = model[key]
return result
def is_included(dict1, dict2):
"""Test if dict1 is included in dict2."""
for key, value in dict1.items():
try:
if dict2[key] != value:
return False
except KeyError:
return False
return True
def merge(user, default):
"""Merge 2 data structures."""
for key, val in default.items():
if key not in user:
user[key] = val
else:
if isinstance(user[key], dict) and isinstance(val, dict):
user[key] = merge(user[key], val)
elif isinstance(user[key], list) and isinstance(val, list):
user[key] = user[key] + val
else:
user[key] = val
return user
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