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""" |
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weitersager.irc |
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~~~~~~~~~~~~~~~ |
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Internet Relay Chat |
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:Copyright: 2007-2025 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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import logging |
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import ssl |
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from irc.bot import ServerSpec, SingleServerIRCBot |
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from irc.connection import Factory |
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from jaraco.stream.buffer import LenientDecodingLineBuffer |
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from .config import IrcChannel, IrcConfig, IrcServer |
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from .signals import irc_channel_joined |
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from .util import start_thread |
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logger = logging.getLogger(__name__) |
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class Announcer: |
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"""An announcer.""" |
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def start(self) -> None: |
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"""Start the announcer.""" |
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def announce(self, channel_name: str, text: str) -> None: |
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"""Announce a message.""" |
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raise NotImplementedError |
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def shutdown(self) -> None: |
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"""Shut the announcer down.""" |
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class IrcAnnouncer(Announcer): |
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"""An announcer that writes messages to IRC.""" |
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def __init__( |
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self, |
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server: 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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) -> None: |
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self.server = server |
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self.commands = commands |
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self.channels = channels |
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self.bot = _create_bot(server, nickname, realname) |
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self.bot.on_welcome = self._on_welcome |
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def start(self) -> None: |
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"""Connect to the server, in a separate thread.""" |
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logger.info( |
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'Connecting to IRC server %s:%d ...', |
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self.server.host, |
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self.server.port, |
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) |
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start_thread(self.bot.start) |
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def _on_welcome(self, conn, event) -> None: |
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"""Join channels after connect.""" |
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logger.info( |
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'Connected to IRC server %s:%d.', *conn.socket.getpeername() |
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) |
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self._send_commands(conn) |
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self._join_channels(conn) |
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def _send_commands(self, conn): |
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"""Send custom commands after having been welcomed by the server.""" |
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for command in self.commands: |
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conn.send_raw(command) |
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def _join_channels(self, conn): |
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"""Join the configured channels.""" |
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channels = sorted(self.channels) |
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logger.info('Channels to join: %s', ', '.join(c.name for c in channels)) |
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for channel in channels: |
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logger.info('Joining channel %s ...', channel.name) |
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conn.join(channel.name, channel.password or '') |
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def announce(self, channel_name: str, text: str) -> None: |
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"""Announce a message.""" |
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self.bot.connection.privmsg(channel_name, text) |
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def shutdown(self) -> None: |
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"""Shut the announcer down.""" |
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self.bot.disconnect('Bye.') |
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class Bot(SingleServerIRCBot): |
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"""An IRC bot to forward messages to IRC channels.""" |
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def get_version(self) -> str: |
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"""Return this on CTCP VERSION requests.""" |
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return 'Weitersager' |
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def on_nicknameinuse(self, conn, event) -> None: |
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"""Choose another nickname if conflicting.""" |
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self._nickname += '_' |
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conn.nick(self._nickname) |
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def on_join(self, conn, event) -> None: |
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"""Successfully joined channel.""" |
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joined_nick = event.source.nick |
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channel_name = event.target |
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if joined_nick == self._nickname: |
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logger.info('Joined IRC channel: %s', channel_name) |
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irc_channel_joined.send(channel_name=channel_name) |
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def on_badchannelkey(self, conn, event) -> None: |
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"""Channel could not be joined due to wrong password.""" |
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channel_name = event.arguments[0] |
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logger.warning('Cannot join channel %s (bad key).', channel_name) |
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def _create_bot(server: IrcServer, nickname: str, realname: str) -> Bot: |
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"""Create a bot.""" |
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server_spec = ServerSpec(server.host, server.port, server.password) |
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factory = Factory(wrapper=ssl.wrap_socket) if server.ssl else Factory() |
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bot = Bot([server_spec], nickname, realname, connect_factory=factory) |
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_set_rate_limit(bot.connection, server.rate_limit) |
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# Avoid `UnicodeDecodeError` on non-UTF-8 messages. |
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bot.connection.buffer_class = LenientDecodingLineBuffer |
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return bot |
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def _set_rate_limit(connection, rate_limit: float | None) -> None: |
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"""Set rate limit.""" |
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if rate_limit is not None: |
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logger.info( |
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'IRC send rate limit set to %.2f messages per second.', |
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rate_limit, |
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) |
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connection.set_rate_limit(rate_limit) |
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else: |
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logger.info('No IRC send rate limit set.') |
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class DummyAnnouncer(Announcer): |
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"""An announcer that writes messages to STDOUT.""" |
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def __init__(self, channels: set[IrcChannel]) -> None: |
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self.channels = channels |
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def start(self) -> None: |
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"""Start the announcer.""" |
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# Fake channel joins. |
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for channel in sorted(self.channels): |
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irc_channel_joined.send(channel_name=channel.name) |
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def announce(self, channel_name: str, text: str) -> None: |
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"""Announce a message.""" |
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logger.debug('%s> %s', channel_name, text) |
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def create_announcer(config: IrcConfig) -> Announcer: |
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"""Create an announcer.""" |
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if config.server is None: |
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logger.info('No IRC server specified; will write to STDOUT instead.') |
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return DummyAnnouncer(config.channels) |
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return IrcAnnouncer( |
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config.server, |
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config.nickname, |
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config.realname, |
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config.commands, |
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config.channels, |
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) |
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homeworkprod /
weitersager
