474 lines
16 KiB
Python
474 lines
16 KiB
Python
#!/usr/bin/env python3
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import configparser
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import select
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import socket
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import sys
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import threading
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import time
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from collections import namedtuple
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import channel
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from constants import logmessage_types, internal_submessage_types, controlmessage_types
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import botcmd
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import cron
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import line_handling
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Server = namedtuple('Server', ['host', 'port', 'nick', 'username', 'realname', 'channels'])
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class LoggerThread(threading.Thread):
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def __init__(self, interactive_console, logging_channel, dead_notify_channel):
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self.interactive_console = interactive_console
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self.logging_channel = logging_channel
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self.dead_notify_channel = dead_notify_channel
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threading.Thread.__init__(self)
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def run(self):
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while True:
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message_type, *message_data = self.logging_channel.recv()
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# Lines that were sent between server and client
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if message_type == logmessage_types.sent:
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assert len(message_data) == 1
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if self.interactive_console: print('>' + message_data[0])
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elif message_type == logmessage_types.received:
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assert len(message_data) == 1
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if self.interactive_console: print('<' + message_data[0])
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# Messages that are from internal components
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elif message_type == logmessage_types.internal:
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if message_data[0] == internal_submessage_types.quit:
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assert len(message_data) == 1
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print('--- Quit')
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sys.stdout.flush()
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self.dead_notify_channel.send((controlmessage_types.quit,))
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break
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elif message_data[0] == internal_submessage_types.error:
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assert len(message_data) == 2
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print('--- Error', message_data[1])
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sys.stdout.flush()
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elif message_data[0] == internal_submessage_types.server:
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assert len(message_data) == 2
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assert len(message_data[1]) == 2
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print(f'--- Connecting to server {message_data[1][0]}:{message_data[1][1]}')
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sys.stdout.flush()
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else:
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print('--- ???', message_data)
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sys.stdout.flush()
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# Messages about status from the bot code
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elif message_type == logmessage_types.status:
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assert len(message_data) == 2
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print('*', end='')
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print(*message_data[0], **message_data[1])
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sys.stdout.flush()
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else:
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print('???', message_type, message_data)
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sys.stdout.flush()
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# API(serverthread_object)
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# Create a new API object corresponding to given ServerThread object
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class API:
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def __init__(self, serverthread_object):
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# We need to access the internal functions of the ServerThread object in order to send lines etc.
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self.serverthread_object = serverthread_object
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# Have the cron object accessible more easily
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self.cron = serverthread_object.cron_control_channel
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def send_raw(self, line):
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"""Sends a raw line (will terminate it itself.)
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Don't use unless you are completely sure you know what you're doing."""
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self.serverthread_object.send_line_raw(line)
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def msg(self, recipient, message):
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"""Make sending PRIVMSGs much nicer"""
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line = b'PRIVMSG ' + recipient + b' :' + message
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self.serverthread_object.send_line_raw(line)
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def bot_response(self, recipient, message):
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"""Prefix message with ZWSP and convert from unicode to bytestring if necessary."""
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if isinstance(message, str):
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message = message.encode('utf-8')
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self.msg(recipient, '\u200b'.encode('utf-8') + message)
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def nick(self, nick):
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"""Send a NICK command and update the internal nick tracking state"""
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with self.serverthread_object.nick_lock:
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line = b'NICK ' + nick
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self.serverthread_object.send_line_raw(line)
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self.serverthread_object.nick = nick
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def get_nick(self):
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"""Returns current nick"""
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with self.serverthread_object.nick_lock:
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return self.serverthread_object.nick
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def set_nick(self, nick):
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"""Set the internal nick tracking state"""
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with self.serverthread_object.nick_lock:
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self.serverthread_object.nick = nick
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def join(self, channel):
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"""Send a JOIN command and update the internal channel tracking state"""
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with self.serverthread_object.channels_lock:
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line = b'JOIN ' + channel
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self.serverthread_object.send_line_raw(line)
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self.serverthread_object.channels.add(channel)
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def part(self, channel, message = b''):
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"""Send a PART command and update the internal channel tracking state"""
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with self.serverthread_object.channels_lock:
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line = b'PART %s :%s' % (channel, message)
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self.serverthread_object.send_line_raw(line)
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self.serverthread_object.channels.removeadd(channel)
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def get_channels(self):
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"""Returns the current set of channels"""
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with self.serverthread_object.channels_lock:
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return self.serverthread_object.channels
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def set_channels(self, channels):
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"""Set the current set of channels variable"""
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with self.serverthread_object.channels_lock:
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self.serverthread_object.channels = channels
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def quit(self):
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self.serverthread_object.control_channel.send((controlmessage_types.quit,))
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self.serverthread_object.logging_channel.send((logmessage_types.internal, internal_submessage_types.quit))
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cron.quit(self.cron)
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def log(self, *args, **kwargs):
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"""Log a status message. Supports normal print() arguments."""
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self.serverthread_object.logging_channel.send((logmessage_types.status, args, kwargs))
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def error(self, message):
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"""Log an error"""
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self.serverthread_object.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, message))
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# ServerThread(server, auth, control_channel, cron_control_channel, logging_channel)
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# Creates a new server main loop thread
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class ServerThread(threading.Thread):
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def __init__(self, server, auth, control_channel, cron_control_channel, logging_channel):
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self.server = server
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self.auth = auth
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self.control_channel = control_channel
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self.cron_control_channel = cron_control_channel
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self.logging_channel = logging_channel
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self.server_socket_write_lock = threading.Lock()
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self.last_send = 0
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self.last_send_lock = threading.Lock()
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self.nick = None
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self.nick_lock = threading.Lock()
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self.channels = set()
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self.channels_lock = threading.Lock()
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threading.Thread.__init__(self)
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def send_line_raw(self, line):
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# Sanitize line just in case
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line = line.replace(b'\r', b'').replace(b'\n', b'')[:510]
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with self.last_send_lock:
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now = time.monotonic()
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if now - self.last_send < 1:
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# Schedule our message sending one second after the last one
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self.last_send += 1
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wait = self.last_send - now
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else:
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self.last_send = now
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wait = 0
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if wait > 0:
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time.sleep(wait)
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with self.server_socket_write_lock:
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if self.server_socket is not None:
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self.server_socket.sendall(line + b'\r\n')
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else:
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return
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# Don't log PINGs or PONGs
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if not (len(line) >= 5 and (line[:5] == b'PING ' or line[:5] == b'PONG ')):
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self.logging_channel.send((logmessage_types.sent, line.decode(encoding = 'utf-8', errors = 'replace')))
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def handle_line(self, line):
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command, _, arguments = line.partition(b' ')
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split = line.split(b' ')
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if len(split) >= 1 and split[0].upper() == b'PING':
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self.send_line_raw(b'PONG ' + arguments)
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elif len(split) >= 2 and split[0][0:1] == b':' and split[1].upper() == b'PONG':
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# No need to do anything special for PONGs
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pass
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else:
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self.logging_channel.send((logmessage_types.received, line.decode(encoding = 'utf-8', errors = 'replace')))
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# Ensure we have a bytestring, because bytearray can be annoying to deal with
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line = bytes(line)
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line_handling.handle_line(line, irc = self.api)
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def mainloop(self):
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# Register both the server socket and the control channel to a polling object
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poll = select.poll()
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poll.register(self.server_socket, select.POLLIN)
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poll.register(self.control_channel, select.POLLIN)
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# Keep buffer for input
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server_input_buffer = bytearray()
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quitting = False
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reconnecting = False
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while not quitting and not reconnecting:
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# Wait until we can do something
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for fd, event in poll.poll():
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# Server
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if fd == self.server_socket.fileno():
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# Ready to receive, read into buffer and handle full messages
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if event | select.POLLIN:
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try:
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data = self.server_socket.recv(1024)
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except ConnectionResetError:
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, 'Connection reset while reading'))
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reconnecting = True
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break
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# No data to be read even as POLLIN triggered → connection has broken
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# Log it and try reconnecting
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if data == b'':
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, 'Empty read'))
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reconnecting = True
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break
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server_input_buffer.extend(data)
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# Try to see if we have a full line ending with \r\n in the buffer
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# If yes, handle it
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while b'\r\n' in server_input_buffer:
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# Newline was found, split buffer
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line, _, server_input_buffer = server_input_buffer.partition(b'\r\n')
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self.handle_line(line)
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# Remove possible pending ping timeout timer and reset ping timer to 3 minutes
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cron.delete(self.cron_control_channel, self.control_channel, (controlmessage_types.ping_timeout,))
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cron.reschedule(self.cron_control_channel, 3 * 60, self.control_channel, (controlmessage_types.ping,))
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else:
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error_message = 'Event on server socket: %s' % event
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, error_message))
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# Control
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elif fd == self.control_channel.fileno():
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command_type, *arguments = self.control_channel.recv()
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if command_type == controlmessage_types.quit:
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quitting = True
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elif command_type == controlmessage_types.send_line:
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assert len(arguments) == 1
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irc_command, space, arguments = arguments[0].encode('utf-8').partition(b' ')
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line = irc_command.upper() + space + arguments
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self.send_line_raw(line)
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elif command_type == controlmessage_types.ping:
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assert len(arguments) == 0
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self.send_line_raw(b'PING :foo')
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# Reset ping timeout timer to 2 minutes
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cron.reschedule(self.cron_control_channel, 2 * 60, self.control_channel, (controlmessage_types.ping_timeout,))
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elif command_type == controlmessage_types.ping_timeout:
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, 'Ping timeout'))
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reconnecting = True
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elif command_type == controlmessage_types.reconnect:
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reconnecting = True
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else:
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error_message = 'Unknown control message: %s' % repr((command_type, *arguments))
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, error_message))
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else:
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assert False #unreachable
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if reconnecting:
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return True
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else:
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return False
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def run(self):
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while True:
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# Connect to given server
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address = (self.server.host, self.server.port)
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.server, address))
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try:
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self.server_socket = socket.create_connection(address)
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except (ConnectionRefusedError, socket.gaierror, TimeoutError):
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# Tell controller we failed
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, "Can't connect to %s:%s" % address))
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# Try reconnecting in a minute
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cron.reschedule(self.cron_control_channel, 60, self.control_channel, (controlmessage_types.reconnect,))
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# Handle messages
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reconnect = True
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while True:
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command_type, *arguments = self.control_channel.recv()
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if command_type == controlmessage_types.reconnect:
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break
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elif command_type == controlmessage_types.quit:
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reconnect = False
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break
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else:
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error_message = 'Control message not supported when not connected: %s' % repr((command_type, *arguments))
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, error_message))
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# Remove the reconnect message in case we were told to reconnnect manually
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cron.delete(self.cron_control_channel, self.control_channel, (controlmessage_types.reconnect,))
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if reconnect:
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continue
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else:
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break
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# Create an API object to give to outside line handler
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self.api = API(self)
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try:
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# Run initialization
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# Use server-password based authentication if it's set up
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user, password = self.auth
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if user is not None:
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self.send_line_raw(b'PASS %s:%s' % (user.encode(), password.encode()))
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# Set up nick and username
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self.api.nick(self.server.nick.encode('utf-8'))
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self.send_line_raw(b'USER %s a a :%s' % (self.server.username.encode('utf-8'), self.server.realname.encode('utf-8')))
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# Run the on_connect hook, to allow further setup
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botcmd.on_connect(irc = self.api)
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# Join channels
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for channel in self.server.channels:
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self.api.join(channel.encode('utf-8'))
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# Schedule a ping to be sent in 3 minutes of no activity
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cron.reschedule(self.cron_control_channel, 3 * 60, self.control_channel, (controlmessage_types.ping,))
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# Run mainloop
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reconnecting = self.mainloop()
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if not reconnecting:
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# Run bot cleanup code
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botcmd.on_quit(irc = self.api)
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# Tell the server we're quiting
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self.send_line_raw(b'QUIT :%s exiting normally' % self.server.username.encode('utf-8'))
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self.server_socket.close()
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break
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else:
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# Tell server we're reconnecting
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self.send_line_raw(b'QUIT :Reconnecting')
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with self.server_socket_write_lock:
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self.server_socket.close()
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self.server_socket = None
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except (BrokenPipeError, TimeoutError, ConnectionResetError) as err:
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# Connection broke, log it and try to reconnect
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.error, 'Broken socket/pipe or timeout'))
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self.server_socket.close()
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# Tell controller we're quiting
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self.logging_channel.send((logmessage_types.internal, internal_submessage_types.quit))
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# Tell cron we're quiting
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cron.quit(cron_control_channel)
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# spawn_serverthread(server, auth, cron_control_channel, logging_channel) → control_channel
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# Creates a ServerThread for given server and returns the channel for controlling it
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def spawn_serverthread(server, auth, cron_control_channel, logging_channel):
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thread_control_socket, spawner_control_socket = socket.socketpair()
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control_channel = channel.Channel()
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ServerThread(server, auth, control_channel, cron_control_channel, logging_channel).start()
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return control_channel
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# spawn_loggerthread(interactive_console) → logging_channel, dead_notify_channel
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# Spawn logger thread and returns the channel it logs and the channel it uses to notify about quiting
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def spawn_loggerthread(interactive_console):
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logging_channel = channel.Channel()
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dead_notify_channel = channel.Channel()
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LoggerThread(interactive_console, logging_channel, dead_notify_channel).start()
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return logging_channel, dead_notify_channel
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# read_config() → config, server
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# Reads the configuration file and returns the configuration object as well as a server object for spawn_serverthread
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def read_config():
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config = configparser.ConfigParser()
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config.read('bot.conf')
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host = config['server']['host']
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port = int(config['server']['port'])
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nick = config['server']['nick']
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username = config['server']['username']
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realname = config['server']['realname']
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channels = config['server']['channels'].split()
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user = None
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password = None
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if 'auth' in config:
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user = config['auth']['user']
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password = config['auth']['password']
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server = Server(host = host, port = port, nick = nick, username = username, realname = realname, channels = channels)
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return config, server, (user, password)
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if __name__ == '__main__':
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interactive_console = sys.stdin.isatty()
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config, server, auth = read_config()
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botcmd.initialize(config = config)
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cron_control_channel = cron.start()
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logging_channel, dead_notify_channel = spawn_loggerthread(interactive_console)
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control_channel = spawn_serverthread(server, auth, cron_control_channel, logging_channel)
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while interactive_console:
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message = dead_notify_channel.recv(blocking = False)
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if message is not None:
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if message[0] == controlmessage_types.quit:
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break
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cmd = input('')
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if cmd == 'q':
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print('Keyboard quit')
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control_channel.send((controlmessage_types.quit,))
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logging_channel.send((logmessage_types.internal, internal_submessage_types.quit))
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cron.quit(cron_control_channel)
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break
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elif cmd == 'r':
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print('Keyboard reconnect')
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control_channel.send((controlmessage_types.reconnect,))
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elif len(cmd) > 0 and cmd[0] == '/':
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control_channel.send((controlmessage_types.send_line, cmd[1:]))
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