diff options
Diffstat (limited to 'roles/lib_utils/src/class/yedit.py')
-rw-r--r-- | roles/lib_utils/src/class/yedit.py | 667 |
1 files changed, 667 insertions, 0 deletions
diff --git a/roles/lib_utils/src/class/yedit.py b/roles/lib_utils/src/class/yedit.py new file mode 100644 index 000000000..0a4fbe07a --- /dev/null +++ b/roles/lib_utils/src/class/yedit.py @@ -0,0 +1,667 @@ +# 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'} |