125 lines
2.9 KiB
Python
125 lines
2.9 KiB
Python
import argparse
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import dataclasses
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import os
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import typing
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from app import PKG_NAME
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@dataclasses.dataclass(frozen=True, slots=True)
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class Parameters:
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debug: bool = False
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quiet: bool = False
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env: str = "production"
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bind: str = "0.0.0.0"
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port: int = 5000
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workers: int = 4
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timeout: int = 120
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db_url: str = "postgres://postgres:5432/tout-doux"
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@classmethod
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def from_namespace(cls, args: argparse.Namespace) -> Parameters:
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return Parameters(**vars(args))
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def __get_env_str(var: str, default: str) -> str:
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if (result := os.getenv(var)) is None:
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return default
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return result
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def __get_env_int(var: str, default: int) -> int:
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value = __get_env_str(var, str(default))
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if value.isdecimal():
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return int(value)
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return default
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def __add_arg_str(
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parser: argparse.ArgumentParser,
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*flags: str,
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env_var: str,
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default: str,
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help_txt: str,
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) -> None:
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parser.add_argument(
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*flags,
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metavar=env_var,
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default=__get_env_str(env_var, default),
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help=f"{help_txt} (default: {default})" if len(default) else help_txt,
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)
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def __add_arg_int(
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parser: argparse.ArgumentParser,
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*flags: str,
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env_var: str,
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default: int,
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help_txt: str,
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) -> None:
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parser.add_argument(
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*flags,
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type=int,
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metavar=env_var,
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default=__get_env_int(env_var, default),
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help=f"{help_txt} (default: {default})",
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)
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def parse_parameters(args: typing.Sequence[str]) -> Parameters:
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default_values = Parameters()
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parser = argparse.ArgumentParser(
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PKG_NAME,
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suggest_on_error=True,
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)
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parser.add_argument(
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"--debug", action=argparse.BooleanOptionalAction, default=default_values.debug
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)
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parser.add_argument(
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"--quiet", action=argparse.BooleanOptionalAction, default=default_values.quiet
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)
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__add_arg_str(
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parser,
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"--env",
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env_var="APP_ENV",
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default=default_values.env,
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help_txt="environnement",
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)
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__add_arg_str(
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parser,
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"--bind",
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env_var="BIND",
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default=default_values.bind,
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help_txt="server bind address",
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)
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__add_arg_int(
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parser,
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"--port",
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env_var="PORT",
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default=default_values.port,
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help_txt="server http port",
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)
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__add_arg_int(
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parser,
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"--workers",
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env_var="WORKERS",
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default=default_values.workers,
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help_txt="WSGI workers",
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)
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__add_arg_int(
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parser,
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"--timeout",
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env_var="TIMEOUT",
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default=default_values.timeout,
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help_txt="WSGI timeout",
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)
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__add_arg_str(
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parser,
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"--db-url",
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env_var="DB_URL",
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default=default_values.db_url,
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help_txt="database connection url",
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)
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parsed_args = parser.parse_args(args)
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return Parameters.from_namespace(parsed_args)
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