145 lines
5.3 KiB
Python
145 lines
5.3 KiB
Python
import importlib.resources
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from pathlib import Path
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from typing import Optional
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from appdirs import AppDirs
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from dynaconf import Dynaconf, Validator
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import mobilizon_reshare
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from mobilizon_reshare.config import strategies, publishers, notifiers
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from mobilizon_reshare.config.notifiers import notifier_names
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from mobilizon_reshare.config.publishers import publisher_names
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base_validators = [
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# strategy to decide events to publish
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Validator("selection.strategy", must_exist=True, is_type_of=str),
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Validator(
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"publishing.window.begin",
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must_exist=True,
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is_type_of=int,
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gte=0,
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lte=24,
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),
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Validator("publishing.window.end", must_exist=True, is_type_of=int, gte=0, lte=24),
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# url of the main Mobilizon instance to download events from
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Validator("source.mobilizon.url", must_exist=True, is_type_of=str),
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Validator("source.mobilizon.group", must_exist=True, is_type_of=str),
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]
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activeness_validators = [
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Validator(f"publisher.{publisher_name}.active", must_exist=True, is_type_of=bool)
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for publisher_name in publisher_names
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] + [
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Validator(f"notifier.{notifier_name}.active", must_exist=True, is_type_of=bool)
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for notifier_name in notifier_names
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]
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def current_version() -> str:
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with importlib.resources.open_text(mobilizon_reshare, "VERSION") as fp:
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return fp.read()
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def build_settings(
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settings_file: Optional[str] = None, validators: Optional[list[Validator]] = None
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):
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"""
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Creates a Dynaconf base object. Configuration files are checked in this order:
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1. CLI argument
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2. `MOBILIZION_RESHARE_SETTINGS_FILE` environment variable;
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3. User configuration directory. On Linux that's `$XDG_CONFIG_HOME/mobilizon_reshare/<mobilizon-reshare-version>`;
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4. User configuration directory. On Linux that's the first element of
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`$XDG_CONFIG_DIRS` + `/mobilizon_reshare/<mobilizon-reshare-version>`.
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5. The default configuration distributed with the package.
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The first available configuration file will be loaded.
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"""
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dirs = AppDirs(appname="mobilizon-reshare", version=current_version())
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with importlib.resources.path(
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mobilizon_reshare, "settings.toml"
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) as bundled_settings_path:
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for f in [
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settings_file,
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Path(dirs.user_config_dir, "mobilizon_reshare.toml"),
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Path(dirs.site_config_dir, "mobilizon_reshare.toml"),
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bundled_settings_path,
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]:
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if f and Path(f).exists():
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SETTINGS_FILE = f
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break
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ENVVAR_PREFIX = "MOBILIZON_RESHARE"
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return Dynaconf(
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environments=True,
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envvar_prefix=ENVVAR_PREFIX,
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settings_files=SETTINGS_FILE,
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validators=validators or [],
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)
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def build_and_validate_settings(settings_file: Optional[str] = None):
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"""
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Creates a settings object to be used in the application. It collects and apply generic validators and validators
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specific for each publisher, notifier and publication strategy.
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"""
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# we first do a preliminary load of the settings without validation. We will later use them to determine which
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# publishers, notifiers and strategy have been selected
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raw_settings = build_settings(
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settings_file=settings_file, validators=activeness_validators
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)
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# we retrieve validators that are conditional. Each module will analyze the settings and decide which validators
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# need to be applied.
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strategy_validators = strategies.get_validators(raw_settings)
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publisher_validators = publishers.get_validators(raw_settings)
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notifier_validators = notifiers.get_validators(raw_settings)
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# we rebuild the settings, providing all the selected validators.
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settings = build_settings(
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settings_file,
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base_validators
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+ strategy_validators
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+ publisher_validators
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+ notifier_validators,
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)
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# TODO use validation control in dynaconf 3.2.0 once released
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settings.validators.validate()
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return settings
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# this singleton and functions are necessary to put together
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# the necessities of the testing suite, the CLI and still having a single entrypoint to the config.
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# The CLI needs to provide the settings file at run time so we cannot work at import time.
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# The normal Dynaconf options to specify the settings files are also not a valid option because of the two steps
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# validation that prevents us to employ their mechanism to specify settings files. This could probably be reworked
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# better in the future.
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class CustomConfig:
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_instance = None
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_settings_file = None
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def __new__(cls, settings_file: Optional[str] = None):
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if (
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settings_file is None and cls._settings_file is not None
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): # normal access, I don't want to reload
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return cls._instance
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if (
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cls._instance is None and cls._settings_file is None
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) or settings_file != cls._settings_file:
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cls._settings_file = settings_file
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cls._instance = super(CustomConfig, cls).__new__(cls)
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cls.settings = build_and_validate_settings(settings_file)
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return cls._instance
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def update(self, settings_file: Optional[str] = None):
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self.settings = build_and_validate_settings(settings_file)
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def get_settings(settings_file: Optional[str] = None):
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config = CustomConfig(settings_file)
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return config.settings
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