#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Global configuration class for metobs_toolkit.
This module provides a singleton Settings class that stores default configuration
values that can be accessed and modified throughout the package.
@author: thoverga
"""
from __future__ import annotations
import logging
from typing import Dict, Any, Optional, Union
from copy import deepcopy
# import settings modules
from metobs_toolkit.settings_collection.version import __version__
from metobs_toolkit.settings_collection.label_defenitions import (
label_defs,
gapfill_label_group,
failed_gapfill_label_group,
qc_label_group,
scatter,
line,
vline,
)
from metobs_toolkit.settings_collection.plotting_defaults import default_plot_settings
logger = logging.getLogger("<metobs_toolkit>")
class MetObsSettingsError(Exception):
"""Raised when an error occurs in the MetObsSettings."""
def __init__(self, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)
[docs]
class Settings:
"""
Singleton configuration class for metobs_toolkit.
This class stores global settings that are used across multiple functions
and methods in the package. Settings stored here affect behavior throughout
the toolkit (e.g., timezone handling, label definitions, logging).
Note: Settings specific to a single function or method are NOT stored here.
Those are defined as default argument values in the function/method signature.
The class uses the singleton pattern to ensure only one instance exists.
Settings are accessed and modified using class methods, so no instantiation
is required by the user.
Examples
--------
>>> import metobs_toolkit
>>> # Get current setting
>>> metobs_toolkit.Settings.get("store_tz")
'UTC'
"""
_instance: Optional["Settings"] = None
_initialized: bool = False
# Default configuration values
_defaults: Dict[str, Any] = {
"version": __version__,
# Label defenitions
"label_def": label_defs,
"gapfill_label_group": gapfill_label_group,
"failed_gapfill_label_group": failed_gapfill_label_group,
"qc_label_group": qc_label_group,
# Logging defaults
"log_level": "WARNING",
"log_format": "LOG:: %(levelname)s - %(message)s",
# Data storage settings,
"store_tz": "UTC",
# Printing
"print_config": {
"max_width": 80,
"item_indent": " " * 2,
"title_char": "=",
},
# Plotting defaults
"plotting_settings": default_plot_settings,
}
_config: Dict[str, Any] = {}
def __new__(cls) -> "Settings":
"""Ensure only one instance exists (singleton pattern)."""
if cls._instance is None:
cls._instance = super().__new__(cls)
return cls._instance
[docs]
def __init__(self) -> None:
"""Initialize settings with defaults (only once)."""
if not Settings._initialized:
Settings._config = deepcopy(Settings._defaults)
Settings._initialized = True
def __str__(self) -> str:
"""Return a string representation of the Settings."""
return f"MetObs Settings object"
def __repr__(self) -> str:
"""Return a human-readable representation of the Settings."""
return f"MetObs Settings object"
[docs]
@classmethod
def get(cls, key: str, default: Any = None) -> Any:
"""
Get a configuration value.
Parameters
----------
key : str
The configuration key to retrieve. Use dot notation for nested
keys (e.g., "label_def.goodrecord.label").
default : Any, optional
Default value if key is not found. Default is None.
Returns
-------
Any
The configuration value.
Examples
--------
>>> Settings.get("store_tz")
'UTC'
>>> Settings.get("label_def.goodrecord.label")
'ok'
>>> Settings.get("nonexistent_key", "fallback")
'fallback'
"""
# Ensure initialized
cls()
# Handle dot notation for nested keys
keys = key.split(".")
value = cls._config
try:
for k in keys:
value = value[k]
logger.debug(f"Settings: Retrieved: {key} --> {value}")
return value
except KeyError:
if default is not None:
logger.warning(
f"Settings: {key} not found. Returning default: {default}"
)
return default
raise MetObsSettingsError(
f"Settings: Key '{key}' not found and no default provided."
)
except Exception as e:
raise MetObsSettingsError(f"Settings: Error retrieving key '{key}': {e}")
[docs]
@classmethod
def set(cls, key: str, value: Any) -> None:
"""
Set a configuration value.
Parameters
----------
key : str
The configuration key to set. Use dot notation for nested
keys (e.g., "label_def.goodrecord.color").
value : Any
The value to set.
Examples
--------
>>> Settings.set("store_tz", "Europe/Brussels")
>>> Settings.set("log_level", "DEBUG")
"""
# Ensure initialized
cls()
# Handle dot notation for nested keys
keys = key.split(".")
config = cls._config
for k in keys[:-1]:
if k not in config:
config[k] = {}
config = config[k]
config[keys[-1]] = value
logger.debug(f"Settings: {key} set to {value}")
[docs]
@classmethod
def reset(cls, key: Optional[str] = None) -> None:
"""
Reset configuration to defaults.
Parameters
----------
key : str, optional
Specific key to reset. If None, reset all settings to defaults.
Examples
--------
>>> Settings.reset() # Reset all settings
>>> Settings.reset("plot.dpi") # Reset only plot.dpi
"""
if key is None:
cls._config = deepcopy(cls._defaults)
logger.debug("Settings: All settings reset to defaults")
else:
default_value = cls._get_default(key)
if default_value is not None:
cls.set(key, deepcopy(default_value))
logger.debug(f"Settings: {key} reset to default value: {default_value}")
@classmethod
def _get_default(cls, key: str) -> Any:
"""Get default value for a key."""
keys = key.split(".")
value = cls._defaults
try:
for k in keys:
value = value[k]
return value
except (KeyError, TypeError):
return None
[docs]
@classmethod
def to_dict(cls) -> Dict[str, Any]:
"""
Return all settings as a dictionary.
Returns
-------
dict
Copy of all current settings.
Examples
--------
>>> config = Settings.to_dict()
>>> config["log_level"]
'WARNING'
"""
cls()
return deepcopy(cls._config)
[docs]
@classmethod
def get_info(cls, printout: bool = True) -> Union[str, None]:
"""
Get a formatted string with all current settings.
Parameters
----------
printout : bool, optional
If True, print the info string. If False, return it. Default is True.
Returns
-------
str or None
If printout is False, returns the info string. Otherwise, returns None.
"""
# Import here to avoid circular imports
from metobs_toolkit.backend_collection import printing_collection as printing
cls()
def _format_nested_dict(d: dict, indent_level: int = 1) -> str:
"""Recursively format nested dictionary."""
result = ""
for key, val in d.items():
if isinstance(val, dict):
# Print key as a header, then recurse
result += printing.print_fmt_line(f"{key}:", identlvl=indent_level)
result += _format_nested_dict(val, indent_level + 1)
else:
result += printing.print_fmt_line(
f"{key}: {val}", identlvl=indent_level
)
return result
infostr = ""
infostr += printing.print_fmt_title("MetObs Toolkit Settings")
infostr += _format_nested_dict(cls._config, indent_level=1)
if printout:
print(infostr)
return None
else:
return infostr
# ------------------------------------------
# Methods Specific to plotting
# ------------------------------------------
@classmethod
def _get_color_from_label(cls, label) -> str:
cls()
return {
group["label"]: group["plotkwargs"]["color"]
for group in cls.get("label_def").values()
}.get(label, "")
@classmethod
def _label_to_qccheckmap(cls) -> Dict[str, str]:
cls()
return {val["label"]: key for key, val in cls.get("label_def").items()}
@classmethod
def _flag_plot_as_scatter(cls, label: str) -> bool:
cls()
labelmap = cls._label_to_qccheckmap()
plot_as = cls.get(f"label_def.{labelmap[label]}.plot_as", None)
if plot_as == scatter:
return True
else:
return False
@classmethod
def _flag_plot_as_line(cls, label: str) -> bool:
cls()
labelmap = cls._label_to_qccheckmap()
plot_as = cls.get(f"label_def.{labelmap[label]}.plot_as", None)
if plot_as == line:
return True
else:
return False
@classmethod
def _flag_plot_as_vline(cls, label: str) -> bool:
cls()
labelmap = cls._label_to_qccheckmap()
plot_as = cls.get(f"label_def.{labelmap[label]}.plot_as", None)
if plot_as == vline:
return True
else:
return False
# ------------------------------------------
# Methods specific to xarray conv
# ------------------------------------------
@classmethod
def _label_to_numericmap(cls) -> Dict[str, int]:
cls()
return {
val["label"]: int(val["numeric_val"])
for val in cls.get("label_def").values()
}
