import itertools
import re
import os
import socket
import contextlib
import codecs
from datetime import timedelta
from pyparsing import Forward, Keyword, QuotedString, Word, Literal, Suppress, Regex, Optional, SkipTo, ZeroOrMore, \
Group, lineno, col, TokenConverter, replaceWith, alphanums, alphas8bit, ParseSyntaxException, StringEnd
from pyparsing import ParserElement
from .config_tree import ConfigTree, ConfigSubstitution, ConfigList, ConfigValues, ConfigUnquotedString, \
ConfigInclude, NoneValue, ConfigQuotedString
from .exceptions import ConfigSubstitutionException, ConfigMissingException, ConfigException
import logging
import copy
use_urllib2 = False
try:
# For Python 3.0 and later
from urllib.request import urlopen
from urllib.error import HTTPError, URLError
except ImportError: # pragma: no cover
# Fall back to Python 2's urllib2
from urllib2 import urlopen, HTTPError, URLError
use_urllib2 = True
try:
basestring
except NameError: # pragma: no cover
basestring = str
unicode = str
logger = logging.getLogger(__name__)
#
# Substitution Defaults
#
class DEFAULT_SUBSTITUTION(object):
pass
class MANDATORY_SUBSTITUTION(object):
pass
class NO_SUBSTITUTION(object):
pass
class STR_SUBSTITUTION(object):
pass
def period(period_value, period_unit):
try:
from dateutil.relativedelta import relativedelta as period_impl
except Exception:
from datetime import timedelta as period_impl
if period_unit == 'nanoseconds':
period_unit = 'microseconds'
period_value = int(period_value / 1000)
arguments = dict(zip((period_unit,), (period_value,)))
if period_unit == 'milliseconds':
return timedelta(**arguments)
return period_impl(**arguments)
class ConfigFactory(object):
@classmethod
def parse_file(cls, filename, encoding='utf-8', required=True, resolve=True, unresolved_value=DEFAULT_SUBSTITUTION):
"""Parse file
:param filename: filename
:type filename: basestring
:param encoding: file encoding
:type encoding: basestring
:param required: If true, raises an exception if can't load file
:type required: boolean
:param resolve: if true, resolve substitutions
:type resolve: boolean
:param unresolved_value: assigned value value to unresolved substitution.
If overriden with a default value, it will replace all unresolved value to the default value.
If it is set to to pyhocon.STR_SUBSTITUTION then it will replace the value by its
substitution expression (e.g., ${x})
:type unresolved_value: class
:return: Config object
:type return: Config
"""
try:
with codecs.open(filename, 'r', encoding=encoding) as fd:
content = fd.read()
return cls.parse_string(content, os.path.dirname(filename), resolve, unresolved_value)
except IOError as e:
if required:
raise e
logger.warn('Cannot include file %s. File does not exist or cannot be read.', filename)
return []
@classmethod
def parse_URL(cls, url, timeout=None, resolve=True, required=False, unresolved_value=DEFAULT_SUBSTITUTION):
"""Parse URL
:param url: url to parse
:type url: basestring
:param resolve: if true, resolve substitutions
:type resolve: boolean
:param unresolved_value: assigned value value to unresolved substitution.
If overriden with a default value, it will replace all unresolved value to the default value.
If it is set to to pyhocon.STR_SUBSTITUTION then it will replace the value by
its substitution expression (e.g., ${x})
:type unresolved_value: boolean
:return: Config object or []
:type return: Config or list
"""
socket_timeout = socket._GLOBAL_DEFAULT_TIMEOUT if timeout is None else timeout
try:
with contextlib.closing(urlopen(url, timeout=socket_timeout)) as fd:
content = fd.read() if use_urllib2 else fd.read().decode('utf-8')
return cls.parse_string(content, os.path.dirname(url), resolve, unresolved_value)
except (HTTPError, URLError) as e:
logger.warn('Cannot include url %s. Resource is inaccessible.', url)
if required:
raise e
else:
return []
@classmethod
def parse_string(cls, content, basedir=None, resolve=True, unresolved_value=DEFAULT_SUBSTITUTION):
"""Parse URL
:param content: content to parse
:type content: basestring
:param resolve: If true, resolve substitutions
:param resolve: if true, resolve substitutions
:type resolve: boolean
:param unresolved_value: assigned value value to unresolved substitution.
If overriden with a default value, it will replace all unresolved value to the default value.
If it is set to to pyhocon.STR_SUBSTITUTION then it will replace the value by
its substitution expression (e.g., ${x})
:type unresolved_value: boolean
:return: Config object
:type return: Config
"""
return ConfigParser().parse(content, basedir, resolve, unresolved_value)
@classmethod
def from_dict(cls, dictionary, root=False):
"""Convert dictionary (and ordered dictionary) into a ConfigTree
:param dictionary: dictionary to convert
:type dictionary: dict
:return: Config object
:type return: Config
"""
def create_tree(value):
if isinstance(value, dict):
res = ConfigTree(root=root)
for key, child_value in value.items():
res.put(key, create_tree(child_value))
return res
if isinstance(value, list):
return [create_tree(v) for v in value]
else:
return value
return create_tree(dictionary)
class ConfigParser(object):
"""
Parse HOCON files: https://github.com/typesafehub/config/blob/master/HOCON.md
"""
REPLACEMENTS = {
'\\\\': '\\',
'\\\n': '\n',
'\\n': '\n',
'\\r': '\r',
'\\t': '\t',
'\\=': '=',
'\\#': '#',
'\\!': '!',
'\\"': '"',
}
period_type_map = {
'nanoseconds': ['ns', 'nano', 'nanos', 'nanosecond', 'nanoseconds'],
'microseconds': ['us', 'micro', 'micros', 'microsecond', 'microseconds'],
'milliseconds': ['ms', 'milli', 'millis', 'millisecond', 'milliseconds'],
'seconds': ['s', 'second', 'seconds'],
'minutes': ['m', 'minute', 'minutes'],
'hours': ['h', 'hour', 'hours'],
'weeks': ['w', 'week', 'weeks'],
'days': ['d', 'day', 'days'],
}
optional_period_type_map = {
'months': ['mo', 'month', 'months'], # 'm' from hocon spec removed. conflicts with minutes syntax.
'years': ['y', 'year', 'years']
}
supported_period_map = None
@classmethod
def get_supported_period_type_map(cls):
if cls.supported_period_map is None:
cls.supported_period_map = {}
cls.supported_period_map.update(cls.period_type_map)
try:
from dateutil import relativedelta
if relativedelta is not None:
cls.supported_period_map.update(cls.optional_period_type_map)
except Exception:
pass
return cls.supported_period_map
@classmethod
def parse(cls, content, basedir=None, resolve=True, unresolved_value=DEFAULT_SUBSTITUTION):
"""parse a HOCON content
:param content: HOCON content to parse
:type content: basestring
:param resolve: if true, resolve substitutions
:type resolve: boolean
:param unresolved_value: assigned value value to unresolved substitution.
If overriden with a default value, it will replace all unresolved value to the default value.
If it is set to to pyhocon.STR_SUBSTITUTION then it will replace the value by
its substitution expression (e.g., ${x})
:type unresolved_value: boolean
:return: a ConfigTree or a list
"""
unescape_pattern = re.compile(r'\\.')
def replace_escape_sequence(match):
value = match.group(0)
return cls.REPLACEMENTS.get(value, value)
def norm_string(value):
return unescape_pattern.sub(replace_escape_sequence, value)
def unescape_string(tokens):
return ConfigUnquotedString(norm_string(tokens[0]))
def parse_multi_string(tokens):
# remove the first and last 3 "
return tokens[0][3: -3]
def convert_number(tokens):
n = tokens[0]
try:
return int(n, 10)
except ValueError:
return float(n)
def safe_convert_number(tokens):
n = tokens[0]
try:
return int(n, 10)
except ValueError:
try:
return float(n)
except ValueError:
return n
def convert_period(tokens):
period_value = int(tokens.value)
period_identifier = tokens.unit
period_unit = next((single_unit for single_unit, values
in cls.get_supported_period_type_map().items()
if period_identifier in values))
return period(period_value, period_unit)
# ${path} or ${?path} for optional substitution
SUBSTITUTION_PATTERN = r"\$\{(?P<optional>\?)?(?P<variable>[^}]+)\}(?P<ws>[ \t]*)"
def create_substitution(instring, loc, token):
# remove the ${ and }
match = re.match(SUBSTITUTION_PATTERN, token[0])
variable = match.group('variable')
ws = match.group('ws')
optional = match.group('optional') == '?'
substitution = ConfigSubstitution(variable, optional, ws, instring, loc)
return substitution
# ${path} or ${?path} for optional substitution
STRING_PATTERN = '"(?P<value>(?:[^"\\\\]|\\\\.)*)"(?P<ws>[ \t]*)'
def create_quoted_string(instring, loc, token):
# remove the ${ and }
match = re.match(STRING_PATTERN, token[0])
value = norm_string(match.group('value'))
ws = match.group('ws')
return ConfigQuotedString(value, ws, instring, loc)
def include_config(instring, loc, token):
url = None
file = None
required = False
if token[0] == 'required':
required = True
final_tokens = token[1:]
else:
final_tokens = token
if len(final_tokens) == 1: # include "test"
value = final_tokens[0].value if isinstance(final_tokens[0], ConfigQuotedString) else final_tokens[0]
if value.startswith("http://") or value.startswith("https://") or value.startswith("file://"):
url = value
else:
file = value
elif len(final_tokens) == 2: # include url("test") or file("test")
value = final_tokens[1].value if isinstance(token[1], ConfigQuotedString) else final_tokens[1]
if final_tokens[0] == 'url':
url = value
else:
file = value
if url is not None:
logger.debug('Loading config from url %s', url)
obj = ConfigFactory.parse_URL(
url,
resolve=False,
required=required,
unresolved_value=NO_SUBSTITUTION
)
elif file is not None:
path = file if basedir is None else os.path.join(basedir, file)
logger.debug('Loading config from file %s', path)
obj = ConfigFactory.parse_file(
path,
resolve=False,
required=required,
unresolved_value=NO_SUBSTITUTION
)
else:
raise ConfigException('No file or URL specified at: {loc}: {instring}', loc=loc, instring=instring)
return ConfigInclude(obj if isinstance(obj, list) else obj.items())
@contextlib.contextmanager
def set_default_white_spaces():
default = ParserElement.DEFAULT_WHITE_CHARS
ParserElement.setDefaultWhitespaceChars(' \t')
yield
ParserElement.setDefaultWhitespaceChars(default)
with set_default_white_spaces():
assign_expr = Forward()
true_expr = Keyword("true", caseless=True).setParseAction(replaceWith(True))
false_expr = Keyword("false", caseless=True).setParseAction(replaceWith(False))
null_expr = Keyword("null", caseless=True).setParseAction(replaceWith(NoneValue()))
# key = QuotedString('"', escChar='\\', unquoteResults=False) | Word(alphanums + alphas8bit + '._- /')
regexp_numbers = r'[+-]?(\d*\.\d+|\d+(\.\d+)?)([eE][+\-]?\d+)?(?=$|[ \t]*([\$\}\],#\n\r]|//))'
key = QuotedString('"', escChar='\\', unquoteResults=False) | \
Regex(regexp_numbers, re.DOTALL).setParseAction(safe_convert_number) | \
Word(alphanums + alphas8bit + '._- /')
eol = Word('\n\r').suppress()
eol_comma = Word('\n\r,').suppress()
comment = (Literal('#') | Literal('//')) - SkipTo(eol | StringEnd())
comment_eol = Suppress(Optional(eol_comma) + comment)
comment_no_comma_eol = (comment | eol).suppress()
number_expr = Regex(regexp_numbers, re.DOTALL).setParseAction(convert_number)
period_types = itertools.chain.from_iterable(cls.get_supported_period_type_map().values())
period_expr = Regex(r'(?P<value>\d+)\s*(?P<unit>' + '|'.join(period_types) + ')$'
).setParseAction(convert_period)
# multi line string using """
# Using fix described in http://pyparsing.wikispaces.com/share/view/3778969
multiline_string = Regex('""".*?"*"""', re.DOTALL | re.UNICODE).setParseAction(parse_multi_string)
# single quoted line string
quoted_string = Regex(r'"(?:[^"\\\n]|\\.)*"[ \t]*', re.UNICODE).setParseAction(create_quoted_string)
# unquoted string that takes the rest of the line until an optional comment
# we support .properties multiline support which is like this:
# line1 \
# line2 \
# so a backslash precedes the \n
unquoted_string = Regex(r'(?:[^^`+?!@*&"\[\{\s\]\}#,=\$\\]|\\.)+[ \t]*',
re.UNICODE).setParseAction(unescape_string)
substitution_expr = Regex(r'[ \t]*\$\{[^\}]+\}[ \t]*').setParseAction(create_substitution)
string_expr = multiline_string | quoted_string | unquoted_string
value_expr = period_expr | number_expr | true_expr | false_expr | null_expr | string_expr
include_content = (quoted_string | ((Keyword('url') | Keyword(
'file')) - Literal('(').suppress() - quoted_string - Literal(')').suppress()))
include_expr = (
Keyword("include", caseless=True).suppress() + (
include_content | (
Keyword("required") - Literal('(').suppress() - include_content - Literal(')').suppress()
)
)
).setParseAction(include_config)
root_dict_expr = Forward()
dict_expr = Forward()
list_expr = Forward()
multi_value_expr = ZeroOrMore(comment_eol | include_expr | substitution_expr |
dict_expr | list_expr | value_expr | (Literal('\\') - eol).suppress())
# for a dictionary : or = is optional
# last zeroOrMore is because we can have t = {a:4} {b: 6} {c: 7} which is dictionary concatenation
inside_dict_expr = ConfigTreeParser(ZeroOrMore(comment_eol | include_expr | assign_expr | eol_comma))
inside_root_dict_expr = ConfigTreeParser(ZeroOrMore(
comment_eol | include_expr | assign_expr | eol_comma), root=True)
dict_expr << Suppress('{') - inside_dict_expr - Suppress('}')
root_dict_expr << Suppress('{') - inside_root_dict_expr - Suppress('}')
list_entry = ConcatenatedValueParser(multi_value_expr)
list_expr << Suppress('[') - ListParser(list_entry - ZeroOrMore(eol_comma - list_entry)) - Suppress(']')
# special case when we have a value assignment where the string can potentially be the remainder of the line
assign_expr << Group(key - ZeroOrMore(comment_no_comma_eol) -
(dict_expr | (Literal('=') | Literal(':') | Literal('+=')) -
ZeroOrMore(comment_no_comma_eol) - ConcatenatedValueParser(multi_value_expr)))
# the file can be { ... } where {} can be omitted or []
config_expr = ZeroOrMore(comment_eol | eol) + (list_expr | root_dict_expr |
inside_root_dict_expr) + ZeroOrMore(comment_eol | eol_comma)
config = config_expr.parseString(content, parseAll=True)[0]
if resolve:
allow_unresolved = resolve and unresolved_value is not DEFAULT_SUBSTITUTION and \
unresolved_value is not MANDATORY_SUBSTITUTION
has_unresolved = cls.resolve_substitutions(config, allow_unresolved)
if has_unresolved and unresolved_value is MANDATORY_SUBSTITUTION:
raise ConfigSubstitutionException(
'resolve cannot be set to True and unresolved_value to MANDATORY_SUBSTITUTION')
if unresolved_value is not NO_SUBSTITUTION and unresolved_value is not DEFAULT_SUBSTITUTION:
cls.unresolve_substitutions_to_value(config, unresolved_value)
return config
@classmethod
def _resolve_variable(cls, config, substitution):
"""
:param config:
:param substitution:
:return: (is_resolved, resolved_variable)
"""
variable = substitution.variable
try:
return True, config.get(variable)
except ConfigMissingException:
# default to environment variable
value = os.environ.get(variable)
if value is None:
if substitution.optional:
return False, None
else:
raise ConfigSubstitutionException(
"Cannot resolve variable ${{{variable}}} (line: {line}, col: {col})".format(
variable=variable,
line=lineno(substitution.loc, substitution.instring),
col=col(substitution.loc, substitution.instring)))
elif isinstance(value, ConfigList) or isinstance(value, ConfigTree):
raise ConfigSubstitutionException(
"Cannot substitute variable ${{{variable}}} because it does not point to a "
"string, int, float, boolean or null {type} (line:{line}, col: {col})".format(
variable=variable,
type=value.__class__.__name__,
line=lineno(substitution.loc, substitution.instring),
col=col(substitution.loc, substitution.instring)))
return True, value
@classmethod
def _fixup_self_references(cls, config, accept_unresolved=False):
if isinstance(config, ConfigTree) and config.root:
for key in config: # Traverse history of element
history = config.history[key]
previous_item = history[0]
for current_item in history[1:]:
for substitution in cls._find_substitutions(current_item):
prop_path = ConfigTree.parse_key(substitution.variable)
if len(prop_path) > 1 and config.get(substitution.variable, None) is not None:
continue # If value is present in latest version, don't do anything
if prop_path[0] == key:
if isinstance(previous_item, ConfigValues) and not accept_unresolved:
# We hit a dead end, we cannot evaluate
raise ConfigSubstitutionException(
"Property {variable} cannot be substituted. Check for cycles.".format(
variable=substitution.variable
)
)
else:
value = previous_item if len(
prop_path) == 1 else previous_item.get(".".join(prop_path[1:]))
_, _, current_item = cls._do_substitute(substitution, value)
previous_item = current_item
if len(history) == 1:
for substitution in cls._find_substitutions(previous_item):
prop_path = ConfigTree.parse_key(substitution.variable)
if len(prop_path) > 1 and config.get(substitution.variable, None) is not None:
continue # If value is present in latest version, don't do anything
if prop_path[0] == key and substitution.optional:
cls._do_substitute(substitution, None)
if prop_path[0] == key:
value = os.environ.get(key)
if value is not None:
cls._do_substitute(substitution, value)
continue
if substitution.optional: # special case, when self optional referencing without existing
cls._do_substitute(substitution, None)
# traverse config to find all the substitutions
@classmethod
def _find_substitutions(cls, item):
"""Convert HOCON input into a JSON output
:return: JSON string representation
:type return: basestring
"""
if isinstance(item, ConfigValues):
return item.get_substitutions()
substitutions = []
elements = []
if isinstance(item, ConfigTree):
elements = item.values()
elif isinstance(item, list):
elements = item
for child in elements:
substitutions += cls._find_substitutions(child)
return substitutions
@classmethod
def _do_substitute(cls, substitution, resolved_value, is_optional_resolved=True):
unresolved = False
new_substitutions = []
if isinstance(resolved_value, ConfigValues):
resolved_value = resolved_value.transform()
if isinstance(resolved_value, ConfigValues):
unresolved = True
result = resolved_value
else:
# replace token by substitution
config_values = substitution.parent
# if it is a string, then add the extra ws that was present in the original string after the substitution
formatted_resolved_value = resolved_value \
if resolved_value is None \
or isinstance(resolved_value, (dict, list)) \
or substitution.index == len(config_values.tokens) - 1 \
else (str(resolved_value) + substitution.ws)
# use a deepcopy of resolved_value to avoid mutation
config_values.put(substitution.index, copy.deepcopy(formatted_resolved_value))
transformation = config_values.transform()
result = config_values.overriden_value \
if transformation is None and not is_optional_resolved \
else transformation
if result is None and config_values.key in config_values.parent:
del config_values.parent[config_values.key]
else:
config_values.parent[config_values.key] = result
s = cls._find_substitutions(result)
if s:
new_substitutions = s
unresolved = True
return (unresolved, new_substitutions, result)
@classmethod
def _final_fixup(cls, item):
if isinstance(item, ConfigValues):
return item.transform()
elif isinstance(item, list):
return list([cls._final_fixup(child) for child in item])
elif isinstance(item, ConfigTree):
items = list(item.items())
for key, child in items:
item[key] = cls._final_fixup(child)
return item
@classmethod
def unresolve_substitutions_to_value(cls, config, unresolved_value=STR_SUBSTITUTION):
for substitution in cls._find_substitutions(config):
if unresolved_value is STR_SUBSTITUTION:
value = substitution.raw_str()
elif unresolved_value is None:
value = NoneValue()
else:
value = unresolved_value
cls._do_substitute(substitution, value, False)
cls._final_fixup(config)
@classmethod
def resolve_substitutions(cls, config, accept_unresolved=False):
has_unresolved = False
cls._fixup_self_references(config, accept_unresolved)
substitutions = cls._find_substitutions(config)
if len(substitutions) > 0:
unresolved = True
any_unresolved = True
_substitutions = []
cache = {}
while any_unresolved and len(substitutions) > 0 and set(substitutions) != set(_substitutions):
unresolved = False
any_unresolved = True
_substitutions = substitutions[:]
for substitution in _substitutions:
is_optional_resolved, resolved_value = cls._resolve_variable(config, substitution)
# if the substitution is optional
if not is_optional_resolved and substitution.optional:
resolved_value = None
if isinstance(resolved_value, ConfigValues):
parents = cache.get(resolved_value)
if parents is None:
parents = []
link = resolved_value
while isinstance(link, ConfigValues):
parents.append(link)
link = link.overriden_value
cache[resolved_value] = parents
if isinstance(resolved_value, ConfigValues) \
and substitution.parent in parents \
and hasattr(substitution.parent, 'overriden_value') \
and substitution.parent.overriden_value:
# self resolution, backtrack
resolved_value = substitution.parent.overriden_value
unresolved, new_substitutions, result = cls._do_substitute(
substitution, resolved_value, is_optional_resolved)
any_unresolved = unresolved or any_unresolved
substitutions.extend(new_substitutions)
if not isinstance(result, ConfigValues):
substitutions.remove(substitution)
cls._final_fixup(config)
if unresolved:
has_unresolved = True
if not accept_unresolved:
raise ConfigSubstitutionException("Cannot resolve {variables}. Check for cycles.".format(
variables=', '.join('${{{variable}}}: (line: {line}, col: {col})'.format(
variable=substitution.variable,
line=lineno(substitution.loc, substitution.instring),
col=col(substitution.loc, substitution.instring)) for substitution in substitutions)))
cls._final_fixup(config)
return has_unresolved
class ListParser(TokenConverter):
"""Parse a list [elt1, etl2, ...]
"""
def __init__(self, expr=None):
super(ListParser, self).__init__(expr)
self.saveAsList = True
def postParse(self, instring, loc, token_list):
"""Create a list from the tokens
:param instring:
:param loc:
:param token_list:
:return:
"""
cleaned_token_list = [token for tokens in (token.tokens if isinstance(token, ConfigInclude) else [token]
for token in token_list if token != '')
for token in tokens]
config_list = ConfigList(cleaned_token_list)
return [config_list]
class ConcatenatedValueParser(TokenConverter):
def __init__(self, expr=None):
super(ConcatenatedValueParser, self).__init__(expr)
self.parent = None
self.key = None
def postParse(self, instring, loc, token_list):
config_values = ConfigValues(token_list, instring, loc)
return [config_values.transform()]
class ConfigTreeParser(TokenConverter):
"""
Parse a config tree from tokens
"""
def __init__(self, expr=None, root=False):
super(ConfigTreeParser, self).__init__(expr)
self.root = root
self.saveAsList = True
def postParse(self, instring, loc, token_list):
"""Create ConfigTree from tokens
:param instring:
:param loc:
:param token_list:
:return:
"""
config_tree = ConfigTree(root=self.root)
for element in token_list:
expanded_tokens = element.tokens if isinstance(element, ConfigInclude) else [element]
for tokens in expanded_tokens:
# key, value1 (optional), ...
key = tokens[0].strip() if isinstance(tokens[0], (unicode, basestring)) else tokens[0]
operator = '='
if len(tokens) == 3 and tokens[1].strip() in [':', '=', '+=']:
operator = tokens[1].strip()
values = tokens[2:]
elif len(tokens) == 2:
values = tokens[1:]
else:
raise ParseSyntaxException("Unknown tokens {tokens} received".format(tokens=tokens))
# empty string
if len(values) == 0:
config_tree.put(key, '')
else:
value = values[0]
if isinstance(value, list) and operator == "+=":
value = ConfigValues([ConfigSubstitution(key, True, '', False, loc), value], False, loc)
config_tree.put(key, value, False)
elif isinstance(value, unicode) and operator == "+=":
value = ConfigValues([ConfigSubstitution(key, True, '', True, loc), ' ' + value], True, loc)
config_tree.put(key, value, False)
elif isinstance(value, list):
config_tree.put(key, value, False)
else:
existing_value = config_tree.get(key, None)
if isinstance(value, ConfigTree) and not isinstance(existing_value, list):
# Only Tree has to be merged with tree
config_tree.put(key, value, True)
elif isinstance(value, ConfigValues):
conf_value = value
value.parent = config_tree
value.key = key
if isinstance(existing_value, list) or isinstance(existing_value, ConfigTree):
config_tree.put(key, conf_value, True)
else:
config_tree.put(key, conf_value, False)
else:
config_tree.put(key, value, False)
return config_tree