#!/usr/bin/env python3 """Global settings definition.""" import os from pathlib import Path from pathlib import PurePath import anyconfig import environs import jsonschema.exceptions import ruamel.yaml from appdirs import AppDirs from jsonschema._utils import format_as_index import prometheuspvesd.exception from prometheuspvesd.utils import Singleton config_dir = AppDirs("prometheus-pve-sd").user_config_dir default_config_file = os.path.join(config_dir, "config.yml") cache_dir = AppDirs("prometheus-pve-sd").user_cache_dir default_output_file = os.path.join(cache_dir, "pve.json") class Config(): """ Create an object with all necessary settings. Settings are loade from multiple locations in defined order (last wins): - default settings defined by `self._get_defaults()` - yaml config file, defaults to OS specific user config dir (https://pypi.org/project/appdirs/) - provides cli parameters """ SETTINGS = { "metrics.enabled": { "default": True, "env": "METRICS_ENABLED", "type": environs.Env().bool }, "metrics.address": { "default": "127.0.0.1", "env": "METRICS_ADDRESS", "type": environs.Env().str }, "metrics.port": { "default": 8000, "env": "METRICS_PORT", "type": environs.Env().int }, "config_file": { "default": "", "env": "CONFIG_FILE", "type": environs.Env().str }, "logging.level": { "default": "WARNING", "env": "LOG_LEVEL", "file": True, "type": environs.Env().str }, "logging.format": { "default": "console", "env": "LOG_FORMAT", "file": True, "type": environs.Env().str }, "output_file": { "default": default_output_file, "env": "OUTPUT_FILE", "file": True, "type": environs.Env().str }, "output_file_mode": { "default": "0644", "env": "OUTPUT_FILE_MODE", "file": True, "type": environs.Env().str }, "loop_delay": { "default": 300, "env": "LOOP_DELAY", "file": True, "type": environs.Env().int }, "service": { "default": True, "env": "SERVICE", "file": True, "type": environs.Env().bool }, "exclude_state": { "default": [], "env": "EXCLUDE_STATE", "file": True, "type": environs.Env().list }, "exclude_vmid": { "default": [], "env": "EXCLUDE_VMID", "file": True, "type": environs.Env().list }, "exclude_tags": { "default": [], "env": "EXCLUDE_TAGS", "file": True, "type": environs.Env().list }, "pve.server": { "default": "", "env": "PVE_SERVER", "file": True, "type": environs.Env().str }, "pve.user": { "default": "", "env": "PVE_USER", "file": True, "type": environs.Env().str }, "pve.password": { "default": "", "env": "PVE_PASSWORD", "file": True, "type": environs.Env().str }, "pve.auth_timeout": { "default": 5, "env": "PVE_AUTH_TIMEOUT", "file": True, "type": environs.Env().int }, "pve.verify_ssl": { "default": True, "env": "PVE_VERIFY_SSL", "file": True, "type": environs.Env().bool }, } def __init__(self, args={}): """ Initialize a new settings class. :param args: An optional dict of options, arguments and commands from the CLI. :param config_file: An optional path to a yaml config file. :returns: None """ self._args = args self._schema = None self.config_file = default_config_file self.config = None self._set_config() def _get_args(self, args): cleaned = dict(filter(lambda item: item[1] is not None, args.items())) normalized = {} for key, value in cleaned.items(): normalized = self._add_dict_branch(normalized, key.split("."), value) # Override correct log level from argparse levels = ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"] log_level = levels.index(self.SETTINGS["logging.level"]["default"]) if normalized.get("logging"): for adjustment in normalized["logging"]["level"]: log_level = min(len(levels) - 1, max(log_level + adjustment, 0)) normalized["logging"]["level"] = levels[log_level] return normalized def _get_defaults(self): normalized = {} for key, item in self.SETTINGS.items(): normalized = self._add_dict_branch(normalized, key.split("."), item["default"]) self.schema = anyconfig.gen_schema(normalized) return normalized def _get_envs(self): normalized = {} for key, item in self.SETTINGS.items(): if item.get("env"): prefix = "PROMETHEUS_PVE_SD_" envname = prefix + item["env"] try: value = item["type"](envname) normalized = self._add_dict_branch(normalized, key.split("."), value) except environs.EnvError as e: if '"{}" not set'.format(envname) in str(e): pass else: raise prometheuspvesd.exception.ConfigError( "Unable to read environment variable", str(e) ) return normalized def _set_config(self): args = self._get_args(self._args) envs = self._get_envs() defaults = self._get_defaults() # preset config file path if envs.get("config_file"): self.config_file = self._normalize_path(envs.get("config_file")) if args.get("config_file"): self.config_file = self._normalize_path(args.get("config_file")) source_files = [] source_files.append(self.config_file) for config in source_files: if config and os.path.exists(config): with open(config, "r", encoding="utf8") as stream: s = stream.read() try: file_dict = ruamel.yaml.YAML(typ="safe", pure=True).load(s) except ( ruamel.yaml.composer.ComposerError, ruamel.yaml.scanner.ScannerError ) as e: message = "{} {}".format(e.context, e.problem) raise prometheuspvesd.exception.ConfigError( "Unable to read config file {}".format(config), message ) if self._validate(file_dict): anyconfig.merge(defaults, file_dict, ac_merge=anyconfig.MS_DICTS) defaults["logging"]["level"] = defaults["logging"]["level"].upper() if self._validate(envs): anyconfig.merge(defaults, envs, ac_merge=anyconfig.MS_DICTS) if self._validate(args): anyconfig.merge(defaults, args, ac_merge=anyconfig.MS_DICTS) if "config_file" in defaults: defaults.pop("config_file") defaults["logging"]["level"] = defaults["logging"]["level"].upper() defaults["logging"]["format"] = defaults["logging"]["format"].strip().lower() Path(PurePath(self.config_file).parent).mkdir(parents=True, exist_ok=True) Path(PurePath(defaults["output_file"]).parent).mkdir(parents=True, exist_ok=True) self.config = defaults def _normalize_path(self, path): if not os.path.isabs(path): base = os.path.join(os.getcwd(), path) return os.path.abspath(os.path.expanduser(os.path.expandvars(base))) else: return path def _validate(self, config): try: anyconfig.validate(config, self.schema, ac_schema_safe=False) except jsonschema.exceptions.ValidationError as e: schema_error = "Failed validating '{validator}' in schema{schema}\n{message}".format( validator=e.validator, schema=format_as_index(list(e.relative_schema_path)[:-1], 0), message=e.message ) raise prometheuspvesd.exception.ConfigError("Configuration error", schema_error) return True def _add_dict_branch(self, tree, vector, value): key = vector[0] tree[key] = value \ if len(vector) == 1 \ else self._add_dict_branch(tree[key] if key in tree else {}, vector[1:], value) return tree class SingleConfig(Config, metaclass=Singleton): """Singleton config class.""" pass