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""" |
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weitersager.config |
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~~~~~~~~~~~~~~~~~~ |
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Configuration loading |
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:Copyright: 2007-2022 Jochen Kupperschmidt |
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:License: MIT, see LICENSE for details. |
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""" |
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from __future__ import annotations |
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from dataclasses import dataclass |
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import logging |
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from pathlib import Path |
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from typing import Any, Iterator, Optional |
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import rtoml |
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DEFAULT_HTTP_HOST = '127.0.0.1' |
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DEFAULT_HTTP_PORT = 8080 |
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DEFAULT_IRC_SERVER_PORT = 6667 |
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DEFAULT_IRC_REALNAME = 'Weitersager' |
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class ConfigurationError(Exception): |
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"""Indicates a configuration error.""" |
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@dataclass(frozen=True) |
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class Config: |
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log_level: str |
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http: HttpConfig |
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irc: IrcConfig |
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@dataclass(frozen=True) |
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class HttpConfig: |
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"""An HTTP receiver configuration.""" |
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host: str |
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port: int |
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api_tokens: set[str] |
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channel_tokens_to_channel_names: dict[str, str] |
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@dataclass(frozen=True) |
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class IrcServer: |
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"""An IRC server.""" |
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host: str |
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port: int = DEFAULT_IRC_SERVER_PORT |
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ssl: bool = False |
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password: Optional[str] = None |
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rate_limit: Optional[float] = None |
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@dataclass(frozen=True, order=True) |
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class IrcChannel: |
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"""An IRC channel.""" |
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name: str |
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password: Optional[str] = None |
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@dataclass(frozen=True) |
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class IrcConfig: |
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"""An IRC bot configuration.""" |
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server: Optional[IrcServer] |
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nickname: str |
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realname: str |
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commands: list[str] |
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channels: set[IrcChannel] |
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def load_config(path: Path) -> Config: |
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"""Load configuration from file.""" |
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data = rtoml.load(path) |
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log_level = _get_log_level(data) |
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http_config = _get_http_config(data) |
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irc_config = _get_irc_config(data) |
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return Config( |
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log_level=log_level, |
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http=http_config, |
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irc=irc_config, |
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) |
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def _get_log_level(data: dict[str, Any]) -> str: |
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level = data.get('log_level', 'debug').upper() |
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if level not in {'CRITICAL', 'ERROR', 'WARNING', 'INFO', 'DEBUG'}: |
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raise ConfigurationError(f'Unknown log level "{level}"') |
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return level |
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def _get_http_config(data: dict[str, Any]) -> HttpConfig: |
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data_http = data.get('http', {}) |
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host = data_http.get('host', DEFAULT_HTTP_HOST) |
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port = int(data_http.get('port', DEFAULT_HTTP_PORT)) |
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api_tokens = set(data_http.get('api_tokens', [])) |
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channel_tokens_to_channel_names = _get_channel_tokens_to_channel_names(data) |
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return HttpConfig(host, port, api_tokens, channel_tokens_to_channel_names) |
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def _get_channel_tokens_to_channel_names( |
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data: dict[str, Any] |
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) -> dict[str, str]: |
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channel_tokens_to_channel_names = {} |
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for channel in data['irc'].get('channels', []): |
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channel_name = channel['name'] |
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tokens = set(channel.get('tokens', [])) |
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for token in tokens: |
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if token in channel_tokens_to_channel_names: |
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raise ConfigurationError( |
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f'A channel token for channel "{channel_name}" ' |
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'is already configured somewhere else.' |
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) |
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channel_tokens_to_channel_names[token] = channel_name |
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return channel_tokens_to_channel_names |
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def _get_irc_config(data: dict[str, Any]) -> IrcConfig: |
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data_irc = data['irc'] |
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server = _get_irc_server(data_irc) |
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nickname = data_irc['bot']['nickname'] |
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realname = data_irc['bot'].get('realname', DEFAULT_IRC_REALNAME) |
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commands = data_irc.get('commands', []) |
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channels = set(_get_irc_channels(data_irc)) |
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return IrcConfig( |
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server=server, |
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nickname=nickname, |
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realname=realname, |
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commands=commands, |
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channels=channels, |
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) |
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def _get_irc_server(data_irc: Any) -> Optional[IrcServer]: |
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data_server = data_irc.get('server') |
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if data_server is None: |
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return None |
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host = data_server.get('host') |
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if not host: |
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return None |
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port = int(data_server.get('port', DEFAULT_IRC_SERVER_PORT)) |
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ssl = data_server.get('ssl', False) |
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password = data_server.get('password') |
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rate_limit_str = data_server.get('rate_limit') |
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rate_limit = float(rate_limit_str) if rate_limit_str else None |
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return IrcServer( |
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host=host, port=port, ssl=ssl, password=password, rate_limit=rate_limit |
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) |
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def _get_irc_channels(data_irc: Any) -> Iterator[IrcChannel]: |
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for channel in data_irc.get('channels', []): |
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name = channel['name'] |
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password = channel.get('password') |
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yield IrcChannel(name, password) |
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homeworkprod /
weitersager
