netdata/collectors/python.d.plugin/python_modules/bases/loaders.py

# -*- coding: utf-8 -*-
# Description:
# Author: Ilya Mashchenko (ilyam8)
# SPDX-License-Identifier: GPL-3.0-or-later


from sys import version_info

PY_VERSION = version_info[:2]

try:
    if PY_VERSION > (3, 1):
        from pyyaml3 import SafeLoader as YamlSafeLoader
    else:
        from pyyaml2 import SafeLoader as YamlSafeLoader
except ImportError:
    from yaml import SafeLoader as YamlSafeLoader


try:
    from collections import OrderedDict
except ImportError:
    from third_party.ordereddict import OrderedDict


DEFAULT_MAPPING_TAG = 'tag:yaml.org,2002:map' if PY_VERSION > (3, 1) else u'tag:yaml.org,2002:map'


def dict_constructor(loader, node):
    return OrderedDict(loader.construct_pairs(node))


YamlSafeLoader.add_constructor(DEFAULT_MAPPING_TAG, dict_constructor)


def load_yaml(stream):
    loader = YamlSafeLoader(stream)
    try:
        return loader.get_single_data()
    finally:
        loader.dispose()


def load_config(file_name):
    with open(file_name, 'r') as stream:
        return load_yaml(stream)