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# airc.py
import asyncio
import logging
import ssl
from collections import defaultdict
from typing import (Awaitable, Callable, Dict, List, NamedTuple, Optional,
Union)
# --- Basic Configuration ---
logging.basicConfig(
level=logging.INFO,
format='%(asctime)s - %(levelname)s - %(message)s'
)
# --- Message Parsing ---
class Prefix(NamedTuple):
"""Represents the prefix of an IRC message (nick!user@host)."""
nick: str
user: Optional[str] = None
host: Optional[str] = None
class Message(NamedTuple):
"""Represents a parsed IRC message."""
prefix: Optional[Prefix]
command: str
params: List[str]
@classmethod
def parse(cls, line: str) -> 'Message':
"""Parses a raw IRC line into a Message object."""
line = line.strip()
prefix, command, params = None, '', []
if line.startswith(':'):
prefix_str, line = line.split(' ', 1)
nick, _, user_host = prefix_str[1:].partition('!')
user, _, host = user_host.partition('@')
prefix = Prefix(nick, user or None, host or None)
if ' :' in line:
parts, trailing = line.split(' :', 1)
params = parts.split()
params.append(trailing)
else:
params = line.split()
command = params.pop(0)
return cls(prefix, command.upper(), params)
class Client:
def __init__(
self,
host: str,
port: int,
nickname: str,
username: str = None,
realname: str = None,
password: Optional[str] = None,
use_ssl: bool = True,
):
self.host = host
self.port = port
self.use_ssl = use_ssl
self.nickname = nickname
self.username = username or nickname
self.realname = realname or nickname
self.password = password
self._reader: Optional[asyncio.StreamReader] = None
self._writer: Optional[asyncio.StreamWriter] = None
self._is_connected = False
self._handlers: Dict[str, List[Callable[..., Awaitable[None]]]] = defaultdict(list)
# Register essential internal handlers
self.on('PING')(self._handle_ping)
async def connect(self, reconnect_delay: int = 10):
"""
Connects to the IRC server and enters the main processing loop.
Will attempt to reconnect if the connection is lost.
"""
while True:
try:
logging.info(f"Connecting to {self.host}:{self.port}...")
ssl_context = ssl.create_default_context() if self.use_ssl else None
self._reader, self._writer = await asyncio.open_connection(
self.host, self.port, ssl=ssl_context
)
self._is_connected = True
logging.info("Connection successful.")
await self._register()
await self._read_loop()
except (ConnectionRefusedError, OSError) as e:
logging.error(f"Connection failed: {e}")
except Exception as e:
logging.error(f"An unexpected error occurred: {e}", exc_info=True)
finally:
self._is_connected = False
if self._writer:
self._writer.close()
await self._writer.wait_closed()
logging.info(f"Disconnected. Reconnecting in {reconnect_delay} seconds...")
await asyncio.sleep(reconnect_delay)
async def _register(self):
"""Sends initial NICK/USER/PASS commands to register with the server."""
if self.password:
await self.send_raw(f"PASS {self.password}")
await self.send_raw(f"NICK {self.nickname}")
await self.send_raw(f"USER {self.username} 0 * :{self.realname}")
async def _read_loop(self):
"""Continuously reads from the server, parses messages, and dispatches them."""
while self._is_connected and self._reader:
raw_line = await self._reader.readline()
if not raw_line:
logging.warning("Received empty data, connection likely closed.")
break
line = raw_line.decode('utf-8', errors='replace').strip()
logging.debug(f"<- {line}")
try:
message = Message.parse(line)
await self._dispatch(message)
except Exception as e:
logging.error(f"Failed to parse or dispatch line '{line}': {e}")
async def _dispatch(self, message: Message):
"""Calls registered handlers for a given message command."""
# Handlers for specific commands (e.g., 'PRIVMSG', '001')
for handler in self._handlers.get(message.command, []):
asyncio.create_task(handler(message))
# Wildcard handlers that receive all messages
for handler in self._handlers.get('*', []):
asyncio.create_task(handler(message))
async def _handle_ping(self, message: Message):
"""Internal PING handler to keep the connection alive."""
pong_data = message.params[0]
await self.send_raw(f"PONG :{pong_data}")
logging.info(f"Responded to PING with PONG {pong_data}")
def on(self, command: str) -> Callable:
"""
A decorator to register a handler for a specific IRC command.
Example:
@client.on('PRIVMSG')
async def on_message(message: Message):
print(f"Received: {message}")
"""
def decorator(func: Callable[[Message], Awaitable[None]]):
self._handlers[command.upper()].append(func)
return func
return decorator
# --- Public API Methods ---
async def send_raw(self, data: str):
if self._writer and self._is_connected:
encoded_data = data.encode('utf-8')
if len(encoded_data) > 500:
encoded_data = encoded_data[:500]
encoded_data = encoded_data + b'\r\n'
self._writer.write(encoded_data)
await self._writer.drain()
logging.debug(f"-> {data}")
else:
logging.error("Cannot send data: not connected.")
async def send_privmsg(self, target: str, text: str):
lines = text.split('\n')
for line in text.split('\n'):
await self.send_raw(f"PRIVMSG {target} :{line}")
async def join(self, channel: str):
await self.send_raw(f"JOIN {channel}")
async def part(self, channel: str, reason: str = "Leaving"):
await self.send_raw(f"PART {channel} :{reason}")
async def quit(self, reason: str = "Client shutting down"):
await self.send_raw(f"QUIT :{reason}")
if self._writer:
self._writer.close()
await self._writer.wait_closed()
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