248 lines
8.0 KiB
Python
248 lines
8.0 KiB
Python
#!/usr/bin/env python3
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"""Global settings definition."""
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import os
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from pathlib import Path
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from pathlib import PurePath
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import anyconfig
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import environs
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import jsonschema.exceptions
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import ruamel.yaml
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from appdirs import AppDirs
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from jsonschema._utils import format_as_index
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import prometheuspvesd.exception
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from prometheuspvesd.utils import Singleton
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config_dir = AppDirs("prometheus-pve-sd").user_config_dir
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default_config_file = os.path.join(config_dir, "config.yml")
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cache_dir = AppDirs("prometheus-pve-sd").user_cache_dir
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default_output_file = os.path.join(cache_dir, "pve.json")
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class Config():
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"""
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Create an object with all necessary settings.
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Settings are loade from multiple locations in defined order (last wins):
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- default settings defined by `self._get_defaults()`
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- yaml config file, defaults to OS specific user config dir (https://pypi.org/project/appdirs/)
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- provides cli parameters
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"""
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SETTINGS = {
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"config_file": {
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"default": "",
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"env": "CONFIG_FILE",
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"type": environs.Env().str
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},
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"logging.level": {
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"default": "WARNING",
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"env": "LOG_LEVEL",
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"file": True,
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"type": environs.Env().str
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},
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"logging.json": {
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"default": False,
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"env": "LOG_JSON",
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"file": True,
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"type": environs.Env().bool
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},
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"output_file": {
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"default": default_output_file,
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"env": "output_file",
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"file": True,
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"type": environs.Env().str
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},
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"loop_delay": {
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"default": 300,
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"env": "LOOP_DELAY",
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"file": True,
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"type": environs.Env().int
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},
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"exclude_state": {
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"default": [],
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"env": "EXCLUDE_STATE",
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"file": True,
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"type": environs.Env().list
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},
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"exclude_vmid": {
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"default": [],
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"env": "EXCLUDE_STATE",
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"file": True,
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"type": environs.Env().list
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},
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"pve.server": {
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"default": "",
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"env": "PVE_SERVER",
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"file": True,
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"type": environs.Env().str
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},
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"pve.user": {
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"default": "",
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"env": "PVE_USER",
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"file": True,
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"type": environs.Env().str
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},
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"pve.password": {
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"default": "",
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"env": "PVE_PASSWORD",
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"file": True,
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"type": environs.Env().str
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},
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"pve.auth_timeout": {
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"default": 5,
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"env": "PVE_AUTH_TIMEOUT",
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"file": True,
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"type": environs.Env().int
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},
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"pve.verify_ssl": {
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"default": True,
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"env": "PVE_VERIFY_SSL",
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"file": True,
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"type": environs.Env().bool
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},
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}
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def __init__(self, args={}):
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"""
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Initialize a new settings class.
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:param args: An optional dict of options, arguments and commands from the CLI.
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:param config_file: An optional path to a yaml config file.
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:returns: None
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"""
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self._args = args
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self._schema = None
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self.config_file = default_config_file
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self.config = None
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self._set_config()
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def _get_args(self, args):
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cleaned = dict(filter(lambda item: item[1] is not None, args.items()))
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normalized = {}
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for key, value in cleaned.items():
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normalized = self._add_dict_branch(normalized, key.split("."), value)
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# Override correct log level from argparse
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levels = ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
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log_level = levels.index(self.SETTINGS["logging.level"]["default"])
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if normalized.get("logging"):
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for adjustment in normalized["logging"]["level"]:
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log_level = min(len(levels) - 1, max(log_level + adjustment, 0))
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normalized["logging"]["level"] = levels[log_level]
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return normalized
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def _get_defaults(self):
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normalized = {}
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for key, item in self.SETTINGS.items():
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normalized = self._add_dict_branch(normalized, key.split("."), item["default"])
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self.schema = anyconfig.gen_schema(normalized)
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return normalized
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def _get_envs(self):
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normalized = {}
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for key, item in self.SETTINGS.items():
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if item.get("env"):
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prefix = "PROMETHEUS_PVE_SD_"
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envname = prefix + item["env"]
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try:
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value = item["type"](envname)
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normalized = self._add_dict_branch(normalized, key.split("."), value)
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except environs.EnvError as e:
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if '"{}" not set'.format(envname) in str(e):
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pass
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else:
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raise prometheuspvesd.exception.ConfigError(
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"Unable to read environment variable", str(e)
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)
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return normalized
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def _set_config(self):
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args = self._get_args(self._args)
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envs = self._get_envs()
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defaults = self._get_defaults()
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# preset config file path
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if envs.get("config_file"):
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self.config_file = self._normalize_path(envs.get("config_file"))
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if args.get("config_file"):
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self.config_file = self._normalize_path(args.get("config_file"))
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source_files = []
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source_files.append(self.config_file)
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for config in source_files:
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if config and os.path.exists(config):
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with open(config, "r", encoding="utf8") as stream:
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s = stream.read()
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try:
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file_dict = ruamel.yaml.safe_load(s)
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except (
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ruamel.yaml.composer.ComposerError, ruamel.yaml.scanner.ScannerError
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) as e:
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message = "{} {}".format(e.context, e.problem)
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raise prometheuspvesd.exception.ConfigError(
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"Unable to read config file {}".format(config), message
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)
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if self._validate(file_dict):
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anyconfig.merge(defaults, file_dict, ac_merge=anyconfig.MS_DICTS)
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defaults["logging"]["level"] = defaults["logging"]["level"].upper()
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if self._validate(envs):
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anyconfig.merge(defaults, envs, ac_merge=anyconfig.MS_DICTS)
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if self._validate(args):
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anyconfig.merge(defaults, args, ac_merge=anyconfig.MS_DICTS)
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if "config_file" in defaults:
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defaults.pop("config_file")
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defaults["logging"]["level"] = defaults["logging"]["level"].upper()
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Path(PurePath(self.config_file).parent).mkdir(parents=True, exist_ok=True)
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Path(PurePath(defaults["output_file"]).parent).mkdir(parents=True, exist_ok=True)
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self.config = defaults
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def _normalize_path(self, path):
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if not os.path.isabs(path):
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base = os.path.join(os.getcwd(), path)
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return os.path.abspath(os.path.expanduser(os.path.expandvars(base)))
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else:
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return path
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def _validate(self, config):
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try:
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anyconfig.validate(config, self.schema, ac_schema_safe=False)
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except jsonschema.exceptions.ValidationError as e:
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schema_error = "Failed validating '{validator}' in schema{schema}\n{message}".format(
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validator=e.validator,
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schema=format_as_index(list(e.relative_schema_path)[:-1]),
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message=e.message
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)
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raise prometheuspvesd.exception.ConfigError("Configuration error", schema_error)
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return True
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def _add_dict_branch(self, tree, vector, value):
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key = vector[0]
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tree[key] = value \
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if len(vector) == 1 \
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else self._add_dict_branch(tree[key] if key in tree else {}, vector[1:], value)
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return tree
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class SingleConfig(Config, metaclass=Singleton):
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"""Singleton config class."""
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pass
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