prometheus-pve-sd/prometheuspvesd/config.py

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#!/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
},
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"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",
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"file": True,
"type": environs.Env().str
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},
"output_file": {
"default": default_output_file,
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"env": "OUTPUT_FILE",
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"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
},
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"exclude_state": {
"default": [],
"env": "EXCLUDE_STATE",
"file": True,
"type": environs.Env().list
},
"exclude_vmid": {
"default": [],
"env": "EXCLUDE_VMID",
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"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.safe_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()
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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]),
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