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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import sys
from pathlib import Path
from ruamel.yaml import YAML
from ruamel.yaml.parser import ParserError
from ruamel.yaml.scanner import ScannerError
class Config:
def __init__(self):
# class variables
self.content = None
# select config file
self.conf_file = Path("config.yml")
if not Path.exists(self.conf_file):
self.conf_file = Path("/etc/ejabberd-metrics.yml")
# read config file
self._read()
def _read(self):
"""init the config object with this method"""
self._check()
# open file as an iostream
with open(self.conf_file, "r", encoding="utf-8") as f:
try:
self.content = YAML(typ="safe").load(f)
# catch json decoding errors
except (ParserError, ScannerError) as err:
print(err, file=sys.stderr)
exit(1)
def _check(self):
"""internal method to check if the config file exists"""
try:
# if file is present continue
if self.conf_file.exists():
return
# if not create a blank file
else:
self.conf_file.touch(mode=0o640)
# catch permission exceptions as this tries to write to /etc/
except PermissionError as err:
print(err, file=sys.stderr)
sys.exit(err.errno)
def get(self, key: str = None, default: (str, int) = None) -> (dict, str, int, None):
"""method to retrieve the whole config data, a single value or the optional default value"""
# if a special key is request, return only that value
if key is not None:
# safety measure
if key in self.content:
return self.content[key]
# if a default value is given return that
if default is not None:
return default
# if the key isn't part if self.content return None
else:
return None
# else return everything
return self.content
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