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"""Kytos utils configuration.""" |
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# This file is part of kytos-utils. |
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# |
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# Copyright (c) 2016 Kytos Team |
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# Authors: |
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# Beraldo Leal <beraldo AT ncc DOT unesp DOT br> |
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import json |
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import logging |
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import os |
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import re |
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import shutil |
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from collections import namedtuple |
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from configparser import ConfigParser |
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from pathlib import Path |
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from urllib.error import URLError |
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from urllib.request import urlopen |
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LOG = logging.getLogger(__name__) |
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def create_skel_dir(): |
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"""Install data_files in the /etc directory.""" |
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base_env = Path(os.environ.get('VIRTUAL_ENV', '/')) |
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etc_kytos = base_env / 'etc' / 'kytos' |
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# kytos-utils/kytos/utils/config.py -> kytos-utils/kytos |
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parent_dir = Path(__file__).resolve().parent.parent |
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if not etc_kytos.exists(): |
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os.makedirs(etc_kytos) |
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src = parent_dir / 'templates' / 'skel' |
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dst = etc_kytos / 'skel' |
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if dst.exists(): |
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if not next(dst.iterdir(), None): |
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# Path already exists but it's empty, so we'll populate it |
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# We remove it first to avoid an exception from copytree |
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dst.rmdir() |
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shutil.copytree(str(src), str(dst)) |
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else: |
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shutil.copytree(str(src), str(dst)) |
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class KytosConfig(): |
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"""Kytos Configs. |
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Read the config file for kytos utils and/or request data for the user in |
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order to get the correct paths and links. |
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""" |
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def __init__(self, config_file='~/.kytosrc'): |
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"""Init method. |
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Receive the config_file as argument. |
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""" |
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create_skel_dir() |
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self.config_file = os.path.expanduser(config_file) |
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self.debug = False |
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if self.debug: |
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LOG.setLevel(logging.DEBUG) |
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# allow_no_value=True is used to keep the comments on the config file. |
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self.config = ConfigParser(allow_no_value=True) |
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# Parse the config file. If no config file was found, then create some |
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# default sections on the config variable. |
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self.config.read(self.config_file) |
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self.check_sections(self.config) |
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self.set_env_or_defaults() |
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if not os.path.exists(self.config_file): |
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LOG.warning("Config file %s not found.", self.config_file) |
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LOG.warning("Creating a new empty config file.") |
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with open(self.config_file, 'w') as output_file: |
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os.chmod(self.config_file, 0o0600) |
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self.config.write(output_file) |
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def log_configs(self): |
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"""Log the read configs if debug is enabled.""" |
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for sec in self.config.sections(): |
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LOG.debug(' %s: %s', sec, self.config.options(sec)) |
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def set_env_or_defaults(self): |
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"""Read some environment variables and set them on the config. |
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If no environment variable is found and the config section/key is |
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empty, then set some default values. |
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""" |
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option = namedtuple('Option', ['section', 'name', 'env_var', |
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'default_value']) |
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options = [option('auth', 'user', 'NAPPS_USER', None), |
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option('auth', 'token', 'NAPPS_TOKEN', None), |
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option('napps', 'api', 'NAPPS_API_URI', |
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'https://napps.kytos.io/api/'), |
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option('napps', 'repo', 'NAPPS_REPO_URI', |
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'https://napps.kytos.io/repo'), |
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option('kytos', 'api', 'KYTOS_API', |
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'http://localhost:8181/')] |
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for option in options: |
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if not self.config.has_option(option.section, option.name): |
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env_value = os.environ.get(option.env_var, |
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option.default_value) |
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if env_value: |
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self.config.set(option.section, option.name, env_value) |
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self.config.set('global', 'debug', str(self.debug)) |
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@staticmethod |
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def check_sections(config): |
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"""Create a empty config file.""" |
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default_sections = ['global', 'auth', 'napps', 'kytos'] |
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for section in default_sections: |
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if not config.has_section(section): |
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config.add_section(section) |
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def save_token(self, user, token): |
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"""Save the token on the config file.""" |
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self.config.set('auth', 'user', user) |
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self.config.set('auth', 'token', token) |
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# allow_no_value=True is used to keep the comments on the config file. |
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new_config = ConfigParser(allow_no_value=True) |
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# Parse the config file. If no config file was found, then create some |
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# default sections on the config variable. |
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new_config.read(self.config_file) |
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self.check_sections(new_config) |
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new_config.set('auth', 'user', user) |
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new_config.set('auth', 'token', token) |
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filename = os.path.expanduser(self.config_file) |
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with open(filename, 'w') as out_file: |
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os.chmod(filename, 0o0600) |
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new_config.write(out_file) |
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def clear_token(self): |
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"""Clear Token information on config file.""" |
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# allow_no_value=True is used to keep the comments on the config file. |
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new_config = ConfigParser(allow_no_value=True) |
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# Parse the config file. If no config file was found, then create some |
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# default sections on the config variable. |
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new_config.read(self.config_file) |
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self.check_sections(new_config) |
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new_config.remove_option('auth', 'user') |
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new_config.remove_option('auth', 'token') |
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filename = os.path.expanduser(self.config_file) |
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with open(filename, 'w') as out_file: |
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os.chmod(filename, 0o0600) |
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new_config.write(out_file) |
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@classmethod |
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def get_metadata(cls): |
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"""Return kytos-utils metadata.""" |
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meta_path = ("%s/metadata.py" % os.path.dirname(__file__)) |
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meta_file = open(meta_path).read() |
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metadata = dict(re.findall(r"(__[a-z]+__)\s*=\s*'([^']+)'", meta_file)) |
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return metadata |
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@classmethod |
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def get_remote_metadata(cls): |
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"""Return kytos metadata.""" |
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kytos_api = KytosConfig().config.get('kytos', 'api') |
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meta_uri = kytos_api + 'api/kytos/core/metadata/' |
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meta_file = urlopen(meta_uri).read() |
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metadata = json.loads(meta_file) |
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return metadata |
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@classmethod |
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def check_versions(cls): |
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"""Check if kytos and kytos-utils metadata are compatible.""" |
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try: |
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kytos_metadata = cls.get_remote_metadata() |
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kytos_version = kytos_metadata.get('__version__') |
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except URLError as exc: |
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LOG.debug('Couldn\'t connect to kytos server: %s', exc) |
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else: |
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kutils_metadata = cls.get_metadata() |
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kutils_version = kutils_metadata.get('__version__') |
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if kytos_version != kutils_version: |
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logger = logging.getLogger() |
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logger.warning('kytos (%s) and kytos utils (%s) versions ' |
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'are not equal.', kytos_version, kutils_version) |
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kytos /
kytos-utils
