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# flake8: noqa
# pylint: skip-file
class YeditException(Exception):
''' Exception class for Yedit '''
pass
# pylint: disable=too-many-public-methods
class Yedit(object):
''' Class to modify yaml files '''
re_valid_key = r"(((\[-?\d+\])|([0-9a-zA-Z%s/_-]+)).?)+$"
re_key = r"(?:\[(-?\d+)\])|([0-9a-zA-Z{}/_-]+)"
com_sep = set(['.', '#', '|', ':'])
# pylint: disable=too-many-arguments
def __init__(self,
filename=None,
content=None,
content_type='yaml',
separator='.',
backup=False):
self.content = content
self._separator = separator
self.filename = filename
self.__yaml_dict = content
self.content_type = content_type
self.backup = backup
self.load(content_type=self.content_type)
if self.__yaml_dict is None:
self.__yaml_dict = {}
@property
def separator(self):
''' getter method for separator '''
return self._separator
@separator.setter
def separator(self, inc_sep):
''' setter method for separator '''
self._separator = inc_sep
@property
def yaml_dict(self):
''' getter method for yaml_dict '''
return self.__yaml_dict
@yaml_dict.setter
def yaml_dict(self, value):
''' setter method for yaml_dict '''
self.__yaml_dict = value
@staticmethod
def parse_key(key, sep='.'):
'''parse the key allowing the appropriate separator'''
common_separators = list(Yedit.com_sep - set([sep]))
return re.findall(Yedit.re_key.format(''.join(common_separators)), key)
@staticmethod
def valid_key(key, sep='.'):
'''validate the incoming key'''
common_separators = list(Yedit.com_sep - set([sep]))
if not re.match(Yedit.re_valid_key.format(''.join(common_separators)), key):
return False
return True
@staticmethod
def remove_entry(data, key, sep='.'):
''' remove data at location key '''
if key == '' and isinstance(data, dict):
data.clear()
return True
elif key == '' and isinstance(data, list):
del data[:]
return True
if not (key and Yedit.valid_key(key, sep)) and \
isinstance(data, (list, dict)):
return None
key_indexes = Yedit.parse_key(key, sep)
for arr_ind, dict_key in key_indexes[:-1]:
if dict_key and isinstance(data, dict):
data = data.get(dict_key)
elif (arr_ind and isinstance(data, list) and
int(arr_ind) <= len(data) - 1):
data = data[int(arr_ind)]
else:
return None
# process last index for remove
# expected list entry
if key_indexes[-1][0]:
if isinstance(data, list) and int(key_indexes[-1][0]) <= len(data) - 1: # noqa: E501
del data[int(key_indexes[-1][0])]
return True
# expected dict entry
elif key_indexes[-1][1]:
if isinstance(data, dict):
del data[key_indexes[-1][1]]
return True
@staticmethod
def add_entry(data, key, item=None, sep='.'):
''' Get an item from a dictionary with key notation a.b.c
d = {'a': {'b': 'c'}}}
key = a#b
return c
'''
if key == '':
pass
elif (not (key and Yedit.valid_key(key, sep)) and
isinstance(data, (list, dict))):
return None
key_indexes = Yedit.parse_key(key, sep)
for arr_ind, dict_key in key_indexes[:-1]:
if dict_key:
if isinstance(data, dict) and dict_key in data and data[dict_key]: # noqa: E501
data = data[dict_key]
continue
elif data and not isinstance(data, dict):
raise YeditException("Unexpected item type found while going through key " +
"path: {} (at key: {})".format(key, dict_key))
data[dict_key] = {}
data = data[dict_key]
elif (arr_ind and isinstance(data, list) and
int(arr_ind) <= len(data) - 1):
data = data[int(arr_ind)]
else:
raise YeditException("Unexpected item type found while going through key path: {}".format(key))
if key == '':
data = item
# process last index for add
# expected list entry
elif key_indexes[-1][0] and isinstance(data, list) and int(key_indexes[-1][0]) <= len(data) - 1: # noqa: E501
data[int(key_indexes[-1][0])] = item
# expected dict entry
elif key_indexes[-1][1] and isinstance(data, dict):
data[key_indexes[-1][1]] = item
# didn't add/update to an existing list, nor add/update key to a dict
# so we must have been provided some syntax like a.b.c[<int>] = "data" for a
# non-existent array
else:
raise YeditException("Error adding to object at path: {}".format(key))
return data
@staticmethod
def get_entry(data, key, sep='.'):
''' Get an item from a dictionary with key notation a.b.c
d = {'a': {'b': 'c'}}}
key = a.b
return c
'''
if key == '':
pass
elif (not (key and Yedit.valid_key(key, sep)) and
isinstance(data, (list, dict))):
return None
key_indexes = Yedit.parse_key(key, sep)
for arr_ind, dict_key in key_indexes:
if dict_key and isinstance(data, dict):
data = data.get(dict_key)
elif (arr_ind and isinstance(data, list) and
int(arr_ind) <= len(data) - 1):
data = data[int(arr_ind)]
else:
return None
return data
@staticmethod
def _write(filename, contents):
''' Actually write the file contents to disk. This helps with mocking. '''
tmp_filename = filename + '.yedit'
with open(tmp_filename, 'w') as yfd:
yfd.write(contents)
os.rename(tmp_filename, filename)
def write(self):
''' write to file '''
if not self.filename:
raise YeditException('Please specify a filename.')
if self.backup and self.file_exists():
shutil.copy(self.filename, self.filename + '.orig')
# Try to set format attributes if supported
try:
self.yaml_dict.fa.set_block_style()
except AttributeError:
pass
# Try to use RoundTripDumper if supported.
try:
Yedit._write(self.filename, yaml.dump(self.yaml_dict, Dumper=yaml.RoundTripDumper))
except AttributeError:
Yedit._write(self.filename, yaml.safe_dump(self.yaml_dict, default_flow_style=False))
return (True, self.yaml_dict)
def read(self):
''' read from file '''
# check if it exists
if self.filename is None or not self.file_exists():
return None
contents = None
with open(self.filename) as yfd:
contents = yfd.read()
return contents
def file_exists(self):
''' return whether file exists '''
if os.path.exists(self.filename):
return True
return False
def load(self, content_type='yaml'):
''' return yaml file '''
contents = self.read()
if not contents and not self.content:
return None
if self.content:
if isinstance(self.content, dict):
self.yaml_dict = self.content
return self.yaml_dict
elif isinstance(self.content, str):
contents = self.content
# check if it is yaml
try:
if content_type == 'yaml' and contents:
# Try to set format attributes if supported
try:
self.yaml_dict.fa.set_block_style()
except AttributeError:
pass
# Try to use RoundTripLoader if supported.
try:
self.yaml_dict = yaml.safe_load(contents, yaml.RoundTripLoader)
except AttributeError:
self.yaml_dict = yaml.safe_load(contents)
# Try to set format attributes if supported
try:
self.yaml_dict.fa.set_block_style()
except AttributeError:
pass
elif content_type == 'json' and contents:
self.yaml_dict = json.loads(contents)
except yaml.YAMLError as err:
# Error loading yaml or json
raise YeditException('Problem with loading yaml file. {}'.format(err))
return self.yaml_dict
def get(self, key):
''' get a specified key'''
try:
entry = Yedit.get_entry(self.yaml_dict, key, self.separator)
except KeyError:
entry = None
return entry
def pop(self, path, key_or_item):
''' remove a key, value pair from a dict or an item for a list'''
try:
entry = Yedit.get_entry(self.yaml_dict, path, self.separator)
except KeyError:
entry = None
if entry is None:
return (False, self.yaml_dict)
if isinstance(entry, dict):
# AUDIT:maybe-no-member makes sense due to fuzzy types
# pylint: disable=maybe-no-member
if key_or_item in entry:
entry.pop(key_or_item)
return (True, self.yaml_dict)
return (False, self.yaml_dict)
elif isinstance(entry, list):
# AUDIT:maybe-no-member makes sense due to fuzzy types
# pylint: disable=maybe-no-member
ind = None
try:
ind = entry.index(key_or_item)
except ValueError:
return (False, self.yaml_dict)
entry.pop(ind)
return (True, self.yaml_dict)
return (False, self.yaml_dict)
def delete(self, path):
''' remove path from a dict'''
try:
entry = Yedit.get_entry(self.yaml_dict, path, self.separator)
except KeyError:
entry = None
if entry is None:
return (False, self.yaml_dict)
result = Yedit.remove_entry(self.yaml_dict, path, self.separator)
if not result:
return (False, self.yaml_dict)
return (True, self.yaml_dict)
def exists(self, path, value):
''' check if value exists at path'''
try:
entry = Yedit.get_entry(self.yaml_dict, path, self.separator)
except KeyError:
entry = None
if isinstance(entry, list):
if value in entry:
return True
return False
elif isinstance(entry, dict):
if isinstance(value, dict):
rval = False
for key, val in value.items():
if entry[key] != val:
rval = False
break
else:
rval = True
return rval
return value in entry
return entry == value
def append(self, path, value):
'''append value to a list'''
try:
entry = Yedit.get_entry(self.yaml_dict, path, self.separator)
except KeyError:
entry = None
if entry is None:
self.put(path, [])
entry = Yedit.get_entry(self.yaml_dict, path, self.separator)
if not isinstance(entry, list):
return (False, self.yaml_dict)
# AUDIT:maybe-no-member makes sense due to loading data from
# a serialized format.
# pylint: disable=maybe-no-member
entry.append(value)
return (True, self.yaml_dict)
# pylint: disable=too-many-arguments
def update(self, path, value, index=None, curr_value=None):
''' put path, value into a dict '''
try:
entry = Yedit.get_entry(self.yaml_dict, path, self.separator)
except KeyError:
entry = None
if isinstance(entry, dict):
# AUDIT:maybe-no-member makes sense due to fuzzy types
# pylint: disable=maybe-no-member
if not isinstance(value, dict):
raise YeditException('Cannot replace key, value entry in dict with non-dict type. ' +
'value=[{}] type=[{}]'.format(value, type(value)))
entry.update(value)
return (True, self.yaml_dict)
elif isinstance(entry, list):
# AUDIT:maybe-no-member makes sense due to fuzzy types
# pylint: disable=maybe-no-member
ind = None
if curr_value:
try:
ind = entry.index(curr_value)
except ValueError:
return (False, self.yaml_dict)
elif index is not None:
ind = index
if ind is not None and entry[ind] != value:
entry[ind] = value
return (True, self.yaml_dict)
# see if it exists in the list
try:
ind = entry.index(value)
except ValueError:
# doesn't exist, append it
entry.append(value)
return (True, self.yaml_dict)
# already exists, return
if ind is not None:
return (False, self.yaml_dict)
return (False, self.yaml_dict)
def put(self, path, value):
''' put path, value into a dict '''
try:
entry = Yedit.get_entry(self.yaml_dict, path, self.separator)
except KeyError:
entry = None
if entry == value:
return (False, self.yaml_dict)
# deepcopy didn't work
# Try to use ruamel.yaml and fallback to pyyaml
try:
tmp_copy = yaml.load(yaml.round_trip_dump(self.yaml_dict,
default_flow_style=False),
yaml.RoundTripLoader)
except AttributeError:
tmp_copy = copy.deepcopy(self.yaml_dict)
# set the format attributes if available
try:
tmp_copy.fa.set_block_style()
except AttributeError:
pass
result = Yedit.add_entry(tmp_copy, path, value, self.separator)
if result is None:
return (False, self.yaml_dict)
# When path equals "" it is a special case.
# "" refers to the root of the document
# Only update the root path (entire document) when its a list or dict
if path == '':
if isinstance(result, list) or isinstance(result, dict):
self.yaml_dict = result
return (True, self.yaml_dict)
return (False, self.yaml_dict)
self.yaml_dict = tmp_copy
return (True, self.yaml_dict)
def create(self, path, value):
''' create a yaml file '''
if not self.file_exists():
# deepcopy didn't work
# Try to use ruamel.yaml and fallback to pyyaml
try:
tmp_copy = yaml.load(yaml.round_trip_dump(self.yaml_dict,
default_flow_style=False),
yaml.RoundTripLoader)
except AttributeError:
tmp_copy = copy.deepcopy(self.yaml_dict)
# set the format attributes if available
try:
tmp_copy.fa.set_block_style()
except AttributeError:
pass
result = Yedit.add_entry(tmp_copy, path, value, self.separator)
if result is not None:
self.yaml_dict = tmp_copy
return (True, self.yaml_dict)
return (False, self.yaml_dict)
@staticmethod
def get_curr_value(invalue, val_type):
'''return the current value'''
if invalue is None:
return None
curr_value = invalue
if val_type == 'yaml':
curr_value = yaml.load(invalue)
elif val_type == 'json':
curr_value = json.loads(invalue)
return curr_value
@staticmethod
def parse_value(inc_value, vtype=''):
'''determine value type passed'''
true_bools = ['y', 'Y', 'yes', 'Yes', 'YES', 'true', 'True', 'TRUE',
'on', 'On', 'ON', ]
false_bools = ['n', 'N', 'no', 'No', 'NO', 'false', 'False', 'FALSE',
'off', 'Off', 'OFF']
# It came in as a string but you didn't specify value_type as string
# we will convert to bool if it matches any of the above cases
if isinstance(inc_value, str) and 'bool' in vtype:
if inc_value not in true_bools and inc_value not in false_bools:
raise YeditException('Not a boolean type. str=[{}] vtype=[{}]'.format(inc_value, vtype))
elif isinstance(inc_value, bool) and 'str' in vtype:
inc_value = str(inc_value)
# There is a special case where '' will turn into None after yaml loading it so skip
if isinstance(inc_value, str) and inc_value == '':
pass
# If vtype is not str then go ahead and attempt to yaml load it.
elif isinstance(inc_value, str) and 'str' not in vtype:
try:
inc_value = yaml.safe_load(inc_value)
except Exception:
raise YeditException('Could not determine type of incoming value. ' +
'value=[{}] vtype=[{}]'.format(type(inc_value), vtype))
return inc_value
@staticmethod
def process_edits(edits, yamlfile):
'''run through a list of edits and process them one-by-one'''
results = []
for edit in edits:
value = Yedit.parse_value(edit['value'], edit.get('value_type', ''))
if edit.get('action') == 'update':
# pylint: disable=line-too-long
curr_value = Yedit.get_curr_value(
Yedit.parse_value(edit.get('curr_value')),
edit.get('curr_value_format'))
rval = yamlfile.update(edit['key'],
value,
edit.get('index'),
curr_value)
elif edit.get('action') == 'append':
rval = yamlfile.append(edit['key'], value)
else:
rval = yamlfile.put(edit['key'], value)
if rval[0]:
results.append({'key': edit['key'], 'edit': rval[1]})
return {'changed': len(results) > 0, 'results': results}
# pylint: disable=too-many-return-statements,too-many-branches
@staticmethod
def run_ansible(params):
'''perform the idempotent crud operations'''
yamlfile = Yedit(filename=params['src'],
backup=params['backup'],
separator=params['separator'])
state = params['state']
if params['src']:
rval = yamlfile.load()
if yamlfile.yaml_dict is None and state != 'present':
return {'failed': True,
'msg': 'Error opening file [{}]. Verify that the '.format(params['src']) +
'file exists, that it is has correct permissions, and is valid yaml.'}
if state == 'list':
if params['content']:
content = Yedit.parse_value(params['content'], params['content_type'])
yamlfile.yaml_dict = content
if params['key']:
rval = yamlfile.get(params['key'])
return {'changed': False, 'result': rval, 'state': state}
elif state == 'absent':
if params['content']:
content = Yedit.parse_value(params['content'], params['content_type'])
yamlfile.yaml_dict = content
if params['update']:
rval = yamlfile.pop(params['key'], params['value'])
else:
rval = yamlfile.delete(params['key'])
if rval[0] and params['src']:
yamlfile.write()
return {'changed': rval[0], 'result': rval[1], 'state': state}
elif state == 'present':
# check if content is different than what is in the file
if params['content']:
content = Yedit.parse_value(params['content'], params['content_type'])
# We had no edits to make and the contents are the same
if yamlfile.yaml_dict == content and \
params['value'] is None:
return {'changed': False, 'result': yamlfile.yaml_dict, 'state': state}
yamlfile.yaml_dict = content
# If we were passed a key, value then
# we enapsulate it in a list and process it
# Key, Value passed to the module : Converted to Edits list #
edits = []
_edit = {}
if params['value'] is not None:
_edit['value'] = params['value']
_edit['value_type'] = params['value_type']
_edit['key'] = params['key']
if params['update']:
_edit['action'] = 'update'
_edit['curr_value'] = params['curr_value']
_edit['curr_value_format'] = params['curr_value_format']
_edit['index'] = params['index']
elif params['append']:
_edit['action'] = 'append'
edits.append(_edit)
elif params['edits'] is not None:
edits = params['edits']
if edits:
results = Yedit.process_edits(edits, yamlfile)
# if there were changes and a src provided to us we need to write
if results['changed'] and params['src']:
yamlfile.write()
return {'changed': results['changed'], 'result': results['results'], 'state': state}
# no edits to make
if params['src']:
# pylint: disable=redefined-variable-type
rval = yamlfile.write()
return {'changed': rval[0],
'result': rval[1],
'state': state}
# We were passed content but no src, key or value, or edits. Return contents in memory
return {'changed': False, 'result': yamlfile.yaml_dict, 'state': state}
return {'failed': True, 'msg': 'Unkown state passed'}
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