"""
Configure application.
"""
# Copyright CFHT/CNRS/SorbonneU
# Licensed under the MIT licence
import os, time
from pathlib import Path
from sys import exit, modules
from typing import Tuple
from argparse import ArgumentParser, SUPPRESS
from configparser import ConfigParser
from pydantic import validate_model
from .. import package
from .settings import AppSettings
[docs]
class Config(object):
"""
Manage application settings in groups.
Settings are stored as Pydantic fields.
"""
def __init__(self):
self.settings = AppSettings()
self.groups = tuple(self.settings.dict().keys())
self.image_filename = None
# Skip argument parsing and stuff if Sphinx or PyTest are involved
if 'sphinx' in modules or 'pytest' in modules:
return
# Parse command line
args_dict = self.parse_args()
if args_dict['version']:
print(f"{package.title} {package.version}")
exit(0)
# Save configuration file if requested
if args_dict['save_config']:
# Create config dir if it does not exist
os.makedirs(os.path.dirname(package.config_file), exist_ok=True)
self.save_config(package.config_file)
exit(0)
# Parse configuration file
self.config_filename = args_dict['config']
if Path(self.config_filename).exists():
config_dict = self.parse_config(self.config_filename)
# Update settings from the config file
self.update_from_dict(config_dict)
# Update settings from the command line
self.update_from_dict(args_dict)
image_filename = args_dict['file']
if Path(image_filename).exists():
self.image_filename = image_filename
else:
exit(f"*Error*: {image_filename} not found!")
[docs]
def grouped_dict(self) -> dict:
"""
Return a dictionary of all settings, organized in groups.
Returns
-------
gdict: dict
Dictionary of settings.
"""
return self.settings.dict()
[docs]
def flat_dict(self) -> dict:
"""
Return a flattened dictionary of all settings.
Returns
-------
fdict: dict
Dictionary of settings.
"""
fdict = {}
for group in self.groups:
settings = getattr(self.settings, group).dict()
for setting in settings:
fdict[setting] = settings[setting]
return fdict
[docs]
def schema(self) -> dict:
"""
Return a schema of the settings as a dictionary.
Returns
-------
schema: dict
Schema of the settings, as a dictionary.
"""
return self.settings.schema()
[docs]
def schema_json(self, indent=2) -> str:
"""
Return a schema of the settings as a JSON string.
Parameters
----------
indent: int
Number of indentation spaces.
Returns
-------
schema: str
JSON schema of the settings.
"""
return self.settings.schema_json(indent=indent)
[docs]
def parse_args(self) -> dict:
"""
Return a dictionary of all settings, with values updated from the
command line.
Extra settings are ignored.
Returns
-------
gdict: dict
Dictionary of all settings, organized in groups.
"""
config = ArgumentParser(
description=f"{package.title} v{package.version} : {package.summary}"
)
# Add options not relevant to configuration itself
config.add_argument(
"-V", "--version",
default=False,
help="Return the version of the package and exit",
action='store_true'
)
config.add_argument(
"-c", "--config",
type=str, default=package.config_file,
help=f"Configuration filename (default={package.config_file})",
metavar="FILE"
)
config.add_argument(
"-s", "--save_config",
default=False,
help="Save a default VisiOmatic configuration file and exit",
action='store_true'
)
config.add_argument(
"file",
default="",
type=str,
help="FITS image filename",
nargs="?"
)
for group in self.groups:
args_group = config.add_argument_group(group.title())
settings = getattr(self.settings, group).schema()['properties']
for setting in settings:
props = settings[setting]
arg = ["-" + props['short'], "--" + setting] \
if props.get('short') else ["--" + setting]
default = props['default']
if props['type']=='boolean':
args_group.add_argument(
*arg,
default=SUPPRESS,
help=props['description'],
action='store_true'
)
elif props['type']=='array':
deftype = type(default[0])
args_group.add_argument(
*arg,
default=SUPPRESS,
type=lambda s: [deftype(val) for val in s.split(',')],
help=f"{props['description']} (default={props['default']})"
)
else:
args_group.add_argument(
*arg,
default=SUPPRESS,
type=type(default),
help=f"{props['description']} (default={props['default']})"
)
# Generate dictionary of args grouped by section
fdict = vars(config.parse_args())
gdict = {}
# Command-line specific arguments
gdict['version'] = fdict['version']
gdict['config'] = fdict['config']
gdict['save_config'] = fdict['save_config']
gdict['file'] = fdict['file']
for group in self.groups:
gdict[group] = {}
gdictg = gdict[group]
settings = getattr(self.settings, group).dict()
for setting in settings:
if setting in fdict:
gdictg[setting] = fdict[setting]
return gdict
[docs]
def parse_config(self, filename: str) -> dict:
"""
Return a dictionary of all settings, with values updated from a
configuration file in INI format.
Extra settings are ignored.
Parameters
----------
filename: str | ~pathlib.Path
Configuration filename.
Returns
-------
gdict: dict
Dictionary of all settings, organized in groups.
"""
config = ConfigParser(converters={})
config.read(filename)
gdict: dict = {}
for group in self.groups:
gdict[group] = {}
gdictg = gdict[group]
settings = getattr(self.settings, group).dict()
for setting in settings:
if (value := config.get(group, setting, fallback=None)) is not None:
stype = type(settings[setting])
gdictg[setting] = tuple(
type(settings[setting][i])(val.strip()) \
for i, val in enumerate(value[1:-1].split(','))
) if stype == tuple \
else value.lower() in ("yes", "true", "t", "1") if stype == bool \
else stype(value)
return gdict
[docs]
def save_config(self, filename) -> None:
"""
Save all settings as a configuration file in INI format.
Extra settings are ignored.
Parameters
----------
filename: str | ~pathlib.Path
Configuration filename.
"""
config = ConfigParser()
for group in self.groups:
config[group] = {}
settings = getattr(self.settings, group).dict()
for setting in settings:
props = f"{settings[setting]}"
config[group][setting] = props
# Ask confirmation if file already exists
if Path(filename).exists():
user_input = input(
f"This will overwrite {filename}! Continue? [y/N]"
)
if user_input.lower() not in ('y', 'yes'):
return
with open(filename, 'w') as config_file:
config_file.write(f"; Default {package.title} configuration file\n")
nowstr = time.strftime("%a, %d %b %Y %H:%M:%S %z", time.localtime())
config_file.write(f"; {nowstr}\n")
config.write(config_file)
[docs]
def update_from_dict(self, settings_dict) -> None:
"""
Update internal settings based on a dictionary (in groups)
Parameters
----------
settings_dict: dict
Input dictionary.
"""
for group in self.groups:
groupsettings = getattr(self.settings, group)
groupsettings_dict = groupsettings.dict()
settings = settings_dict[group]
for setting in settings:
vars(groupsettings).update({setting: settings_dict[group][setting]})
*_, valid_error = validate_model(
groupsettings.__class__,
groupsettings.dict()
)
if valid_error:
print(valid_error)
exit()
# Initialize global dictionary
config = Config()
config_filename = None
image_filename = None
settings = config.flat_dict()
if 'sphinx' not in modules and 'pytest' not in modules:
config_filename = config.config_filename
image_filename = config.image_filename