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# Copyright (c) 2021 Cisco and/or its affiliates.
# 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.
"""Configuration parsing library."""
from logging import getLogger
from pathlib import Path
import sys
from yaml import safe_load, YAMLError
class Parser:
"""
Parser class reponsible for loading configuration.
"""
def __init__(self, configuration_file):
"""
Config Parser init.
:param configuration_file: Telemetry configuration file path.
:type configuration_file: str
"""
self.instance = None
self.config = None
self.suffix = Path(configuration_file).suffix[1:].capitalize()
try:
self.instance = globals()[self.suffix+"Loader"](configuration_file)
except KeyError:
raise ParserError(u"Unsupported file format!")
self.config = FileLoader(self.instance).load()
class FileLoader:
"""
Creates a File Loader object. This is the main object for interacting
with configuration file.
"""
def __init__(self, loader):
"""
File Loader class init.
:param loader: Loader object responsible for handling file type.
:type loader: obj
"""
self.loader = loader
def load(self):
"""
File format parser.
"""
return self.loader.load()
class YamlLoader:
"""
Creates a YAML Loader object. This is the main object for interacting
with YAML file.
"""
def __init__(self, configuration_file):
"""
YAML Loader class init.
:param configuration_file: YAML configuration file path.
:type configuration_file: str
"""
self.configuration_file = configuration_file
def load(self):
"""
YAML format parser.
"""
with open(self.configuration_file, u"r") as stream:
try:
return safe_load(stream)
except YAMLError as exc:
raise ParserError(str(exc))
class ParserError(Exception):
"""
Creates a Parser Error Exception. This exception is supposed to handle
all the errors raised during processing.
"""
def __init__(self, message):
"""
Parser Error Excpetion init.
:param message: Exception error message.
:type message: str
"""
super().__init__()
self.message = message
getLogger(__name__).error(self.message)
sys.exit(1)
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