bot.py

   1 #!/usr/bin/python
   2 # vim: fileencoding=utf-8
   3
   4 # Erebus IRC bot - Author: John Runyon
   5 # "Bot" and "BotConnection" classes (handling a specific "arm")
   6
   7 import os, random, socket, struct, sys, threading, time, traceback
   8 from collections import deque
   9
  10 if sys.version_info.major < 3:
  11         timerbase = threading._Timer
  12         stringbase = basestring
  13 else:
  14         timerbase = threading.Timer
  15         stringbase = str
  16
  17 class MyTimer(timerbase):
  18         def __init__(self, *args, **kwargs):
  19                 timerbase.__init__(self, *args, **kwargs)
  20                 self.daemon = True
  21
  22 if sys.version_info.major < 3:
  23         stringbase = basestring
  24 else:
  25         stringbase = str
  26
  27 #bots = {'erebus': bot.Bot(nick='Erebus', user='erebus', bind='', server='irc.quakenet.org', port=6667, realname='Erebus')}
  28 class Bot(object):
  29         def __init__(self, parent, nick, user, bind, authname, authpass, server, port, realname):
  30                 self.maxlen = 510
  31
  32                 self.parent = parent
  33                 self.nick = nick
  34                 self.permnick = nick
  35                 self.user = user
  36                 self.realname = realname
  37
  38                 self.authname = authname
  39                 self.authpass = authpass
  40
  41                 self.connecttime = 0 # time at which we received numeric 001
  42                 self.server = server # the address we try to (re-)connect to
  43                 self.port = port
  44                 self.servername = server # the name of the server we got connected to
  45
  46                 curs = self.parent.query("SELECT chname FROM chans WHERE bot = %s AND active = 1", (self.permnick,))
  47                 if curs:
  48                         chansres = curs.fetchall()
  49                         curs.close()
  50                         self.chans = [self.parent.newchannel(self, row['chname']) for row in chansres]
  51                 else:
  52                         self.chans = []
  53
  54                 self.conn = BotConnection(self, bind, server, port)
  55
  56                 self.lastreceived = time.time() #time we last received a line from the server
  57                 self.watchdog()
  58
  59                 self.msgqueue = deque()
  60                 self.slowmsgqueue = deque()
  61                 self._makemsgtimer()
  62                 self._msgtimer.start()
  63                 self.joined_chans = False
  64
  65         def __del__(self):
  66                 try:
  67                         curs = self.parent.query("UPDATE bots SET connected = 0 WHERE nick = %s", (self.permnick,))
  68                         curs.close()
  69                 except: pass
  70
  71         def watchdog(self):
  72                 if time.time() > int(self.parent.cfg.get('watchdog', 'maxtime', default=300))+self.lastreceived:
  73                         self.parse("ERROR :Fake-error from watchdog timer.")
  74                 if self.conn.registered():
  75                         self.conn.send("PING :%s" % (time.time()))
  76                         self._checknick()
  77                 watchdogtimer = MyTimer(int(self.parent.cfg.get('watchdog', 'interval', default=30)), self.watchdog)
  78                 watchdogtimer.start()
  79
  80         def log(self, *args, **kwargs):
  81                 self.parent.log(self.nick, *args, **kwargs)
  82
  83         def connect(self):
  84                 self.log('!', "Connecting")
  85                 if self.conn.connect():
  86                         self.log('!', "Connected")
  87                         self.parent.newfd(self, self.conn.socket.fileno())
  88
  89         def getdata(self):
  90                 try:
  91                         recvd = self.conn.read()
  92                         self.lastreceived = time.time()
  93                         return recvd
  94                 except EOFError as e:
  95                         return [":%s ERROR :%s%r" % (self.nick, e.__class__.__name__, e.args)]
  96
  97         def _checknick(self): # check if we're using the right nick, try changing
  98                 if self.nick != self.permnick and self.conn.registered():
  99                         self.conn.send("NICK %s" % (self.permnick))
 100
 101         def parse(self, line):
 102                 if self.parent.cfg.getboolean('debug', 'io'):
 103                         self.log('I', line)
 104                 pieces = line.split()
 105
 106                 if pieces[0][0] == ":":
 107                         numeric = pieces[1]
 108                 else:
 109                         numeric = pieces[0]
 110
 111                 # dispatch dict
 112                 dispatch = {
 113                         'NOTICE': self._gotconnected,
 114                         '001': self._got001,
 115                         '004': self._got004,
 116                         '376': self._gotRegistered,
 117                         '422': self._gotRegistered,
 118                         'PRIVMSG': self._gotprivmsg,
 119                         '353': self._got353, #NAMES
 120                         '354': self._got354, #WHO
 121                         '396': self._gotHiddenHost, # hidden host has been set
 122                         '433': self._got433, #nick in use
 123                         'JOIN': self._gotjoin,
 124                         'PART': self._gotpart,
 125                         'KICK': self._gotkick,
 126                         'QUIT': self._gotquit,
 127                         'NICK': self._gotnick,
 128                         'MODE': self._gotmode,
 129                         'PING': self._gotping,
 130                         'ERROR': self._goterror,
 131                 }
 132
 133                 if self.parent.hasnumhook(numeric):
 134                         hooks = self.parent.getnumhook(numeric)
 135                         for callback in hooks:
 136                                 try:
 137                                         callback(self, line)
 138                                 except Exception:
 139                                         self._cbexception("numhook", line)
 140
 141                 if numeric in dispatch:
 142                         dispatch[numeric](pieces)
 143
 144         def _gotconnected(self, pieces):
 145                 if not self.conn.registered():
 146                         self.conn.register()
 147         def _gotping(self, pieces):
 148                 self.conn.send("PONG %s" % (pieces[1]))
 149                 self._checknick()
 150         def _goterror(self, pieces):
 151                 # TODO: better handling, just reconnect that single bot
 152                 error = ' '.join(pieces)
 153                 try:
 154                         raise Exception(error)
 155                 except Exception as e:
 156                         self.parent.mustquit = e
 157                 try:
 158                         self.quit("Error detected: %s" % (error))
 159                 except: pass
 160                 try:
 161                         curs = self.parent.query("UPDATE bots SET connected = 0")
 162                         curs.close()
 163                 except: pass
 164                 self.log('!', 'Bot exiting due to: %s' % (error))
 165         def _got001(self, pieces):
 166                 # We wait until the end of MOTD instead to consider ourselves registered, but consider uptime as of 001
 167                 self.connecttime = time.time()
 168         def _got004(self, pieces):
 169                 self.servername = pieces[3]
 170         def _gotRegistered(self, pieces):
 171                 self.conn.registered(True)
 172
 173                 curs = self.parent.query("UPDATE bots SET connected = 1 WHERE nick = %s", (self.permnick,))
 174                 if curs: curs.close()
 175
 176                 self.conn.send("MODE %s +x" % (pieces[2]))
 177                 if self.authname is not None and self.authpass is not None:
 178                         self.conn.send(self.parent.cfg.get('erebus', 'auth_command', "AUTH %s %s") % (self.authname, self.authpass))
 179                 if not self.parent.cfg.getboolean('erebus', 'wait_for_hidden_host'):
 180                         for c in self.chans:
 181                                 self.join(c.name)
 182                         self.joined_chans = True
 183         def _gotHiddenHost(self, pieces):
 184                 if not self.joined_chans and self.parent.cfg.getboolean('erebus', 'wait_for_hidden_host'):
 185                         for c in self.chans:
 186                                 self.join(c.name)
 187                         self.joined_chans = True
 188         def _gotprivmsg(self, pieces):
 189                 nick = pieces[0].split('!')[0][1:]
 190                 user = self.parent.user(nick)
 191                 target = pieces[2]
 192                 msg = ' '.join(pieces[3:])[1:]
 193                 self.parsemsg(user, target, msg)
 194         def _got353(self, pieces):
 195                 prefixes = {'@': 'op', '+': 'voice'}
 196                 chan = self.parent.channel(pieces[4])
 197                 names = pieces[5:]
 198                 names[0] = names[0][1:] #remove colon
 199                 for n in names:
 200                         if n[0] in prefixes:
 201                                 user = self.parent.user(n[1:])
 202                                 chan.userjoin(user, prefixes[n[0]])
 203                         else:
 204                                 user = self.parent.user(n)
 205                                 chan.userjoin(user)
 206                         user.join(chan)
 207         def _got354(self, pieces):
 208                 qt = int(pieces[3])
 209                 if qt < 3:
 210                         nick, auth = pieces[4:6]
 211                         chan = None
 212                 else:
 213                         chan, nick, auth = pieces[4:7]
 214                         chan = self.parent.channel(chan)
 215                 user = self.parent.user(nick)
 216                 user.authed(auth)
 217
 218                 if chan is not None:
 219                         user.join(chan)
 220                         chan.userjoin(user)
 221
 222                 if qt == 2: # triggered by !auth
 223                         if user.isauthed():
 224                                 if user.glevel > 0:
 225                                         self.msg(nick, "You are now known as #%s (access level: %s)" % (auth, user.glevel))
 226                                 else:
 227                                         self.msg(nick, "You are now known as #%s (not staff)" % (auth))
 228                         else:
 229                                 self.msg(nick, "I tried, but you're not authed!")
 230         def _got433(self, pieces):
 231                 if not self.conn.registered(): #we're trying to connect
 232                         newnick = "%s%d" % (self.nick, random.randint(111, 999))
 233                         self.conn.send("NICK %s" % (newnick))
 234                         self.nick = newnick
 235         def _gotjoin(self, pieces):
 236                 nick = pieces[0].split('!')[0][1:]
 237                 chan = self.parent.channel(pieces[2])
 238
 239                 if nick == self.nick:
 240                         self.conn.send("WHO %s c%%cant,3" % (chan))
 241                 else:
 242                         user = self.parent.user(nick, send_who=True)
 243                         chan.userjoin(user)
 244                         user.join(chan)
 245         def _clientLeft(self, nick, chan):
 246                 if nick == self.nick:
 247                         for u in chan.users:
 248                                 if u.nick != self.nick:
 249                                         self._clientLeft(u.nick, chan)
 250                 else:
 251                         user = self.parent.user(nick)
 252                         gone = user.part(chan)
 253                         chan.userpart(user)
 254                         if gone:
 255                                 user.quit()
 256                                 del self.parent.users[nick.lower()]
 257         def _gotpart(self, pieces):
 258                 nick = pieces[0].split('!')[0][1:]
 259                 chan = self.parent.channel(pieces[2])
 260                 self._clientLeft(nick, chan)
 261         def _gotkick(self, pieces):
 262                 nick = pieces[3]
 263                 chan = self.parent.channel(pieces[2])
 264                 self._clientLeft(nick, chan)
 265         def _gotquit(self, pieces):
 266                 nick = pieces[0].split('!')[0][1:]
 267                 if nick != self.nick:
 268                         for chan in self.parent.user(nick).chans:
 269                                 chan.userpart(self.parent.user(nick))
 270                         self.parent.user(nick).quit()
 271                         del self.parent.users[nick.lower()]
 272         def _gotnick(self, pieces):
 273                 oldnick = pieces[0].split('!')[0][1:]
 274                 newnick = pieces[2][1:]
 275                 if oldnick == self.nick:
 276                         self.nick = newnick
 277                 else:
 278                         if newnick.lower() != oldnick.lower():
 279                                 self.parent.users[newnick.lower()] = self.parent.users[oldnick.lower()]
 280                                 del self.parent.users[oldnick.lower()]
 281                         self.parent.users[newnick.lower()].nickchange(newnick)
 282         def _gotmode(self, pieces):
 283                 source = pieces[0].split('!')[0][1:]
 284                 chan = pieces[2]
 285                 if not chan.startswith("#"): return
 286                 chan = self.parent.channel(pieces[2])
 287                 mode = pieces[3]
 288                 args = pieces[4:]
 289
 290                 adding = True
 291                 for c in mode:
 292                         if c == '+':
 293                                 adding = True
 294                         elif c == '-':
 295                                 adding = False
 296                         elif c == 'o':
 297                                 if adding:
 298                                         chan.userop(self.parent.user(args.pop(0)))
 299                                 else:
 300                                         chan.userdeop(self.parent.user(args.pop(0)))
 301                         elif c == 'v':
 302                                 if adding:
 303                                         chan.uservoice(self.parent.user(args.pop(0)))
 304                                 else:
 305                                         chan.userdevoice(self.parent.user(args.pop(0)))
 306                         else:
 307                                 pass # don't care about other modes
 308
 309         def _cbexception(self, source, *args, chained=False, **kwargs):
 310                 if not chained: # skip hooks if we were caused by a hook
 311                         exc = sys.exception()
 312                         if self.parent.hasexceptionhook(exc):
 313                                 for callback in self.parent.getexceptionhook(exc):
 314                                         try:
 315                                                 callback(self, exc, source, *args, **kwargs)
 316                                         except Exception:
 317                                                 self._cbexception('exceptionhook', chained=True, module=callback.__module__, function=callback.__name__, underlying=(source, args, kwargs))
 318                 if self.parent.cfg.getboolean('debug', 'cbexc'):
 319                         self.conn.send("PRIVMSG %s :%09.3f \ 34\1f!!! CBEXC\1f\ 3 %s" % (self.parent.cfg.get('debug', 'owner'), time.time() % 100000, source))
 320                         traceback.print_exc(chain=not chained)
 321                         self.log('!', "CBEXC %s %r %r" % (source, args, kwargs))
 322
 323
 324         def parsemsg(self, user, target, msg):
 325                 if user.glevel <= -2: return # short circuit if user is IGNORED
 326                 chan = None
 327                 chanparam = None # was the channel specified as part of the command?
 328                 if len(msg) == 0:
 329                         return
 330
 331                 if target == self.nick:
 332                         if msg.startswith("\001"): #ctcp
 333                                 msg = msg.strip("\001")
 334                                 if msg == "VERSION":
 335                                         self.msg(user, "\001VERSION Erebus v%d.%d - http://jfr.im/git/erebus.git" % (self.parent.APIVERSION, self.parent.RELEASE))
 336                                 return
 337
 338                 triggerused = msg.startswith(self.parent.trigger)
 339                 if triggerused: msg = msg[len(self.parent.trigger):]
 340                 pieces = msg.split()
 341
 342                 if len(pieces) == 0:
 343                         return
 344
 345                 if target != self.nick: # message was sent to a channel
 346                         try:
 347                                 if pieces[0][:-1].lower() == self.nick.lower() and (pieces[0][-1] == ":" or pieces[0][-1] == ","):
 348                                         pieces.pop(0) # command actually starts with next word
 349                                         if len(pieces) == 0: # is there still anything left?
 350                                                 return
 351                                         msg = ' '.join(pieces)
 352                                         triggerused = True
 353                         except IndexError:
 354                                 return # "message" is empty
 355
 356                 if len(pieces) > 1:
 357                         chanword = pieces[1]
 358                         if chanword.startswith('#'):
 359                                 chanparam = self.parent.channel(chanword)
 360
 361                 if target != self.nick: # message was sent to a channel
 362                         chan = self.parent.channel(target)
 363                         if not triggerused:
 364                                 if self.parent.haschanhook(target.lower()):
 365                                         for callback in self.parent.getchanhook(target.lower()):
 366                                                 try:
 367                                                         cbret = callback(self, user, chan, *pieces)
 368                                                         if isinstance(cbret, stringbase):
 369                                                                 self.reply(target, user, cbret)
 370                                                 except:
 371                                                         self.msg(user, "Command failed. Code: CBEXC%09.3f" % (time.time() % 100000))
 372                                                         self._cbexception("chanhook", user=user, target=target, msg=msg)
 373                                 return # not to bot, don't process!
 374
 375                 cmd = pieces[0].lower()
 376                 rancmd = False
 377                 if self.parent.hashook(cmd):
 378                         for callback in self.parent.gethook(cmd):
 379                                 if chanparam is not None and (callback.needchan or callback.wantchan):
 380                                         chan = chanparam
 381                                         pieces.pop(1)
 382                                 if chan is None and callback.needchan:
 383                                         rancmd = True
 384                                         self.msg(user, "You need to specify a channel for that command.")
 385                                 elif user.glevel >= callback.reqglevel and (not callback.needchan or chan.levelof(user.auth) >= callback.reqclevel):
 386                                         rancmd = True
 387                                         try:
 388                                                 cbret = callback(self, user, chan, target, *pieces[1:])
 389                                                 if isinstance(cbret, stringbase):
 390                                                         self.reply(target, user, cbret)
 391                                         except Exception:
 392                                                 self.msg(user, "Command failed. Code: CBEXC%09.3f" % (time.time() % 100000))
 393                                                 self._cbexception("hook", user=user, target=target, msg=msg)
 394                                         except SystemExit as e:
 395                                                 self.parent.mustquit = e
 396                                                 try:
 397                                                         curs = self.parent.query("UPDATE bots SET connected = 0")
 398                                                         curs.close()
 399                                                 except: pass
 400                                                 raise e
 401                 else:
 402                         rancmd = True
 403                         self.msg(user, "I don't know that command.")
 404                 if not rancmd:
 405                         self.msg(user, "You don't have enough access to run that command.")
 406
 407         def __debug_nomsg(self, target, msg):
 408                 if self.parent.cfg.getboolean('debug', 'nomsg'):
 409                         self.conn.send("PRIVMSG %s :%09.3f \ 34\1f!!! NOMSG\1f\ 3 %r, %r" % (self.parent.cfg.get('debug', 'owner'), time.time() % 100000, target, msg))
 410                         self.log('!', "!!! NOMSG")
 411 #                       print "%09.3f %s [!] %s" % (time.time() % 100000, self.nick, "!!! NOMSG")
 412                         traceback.print_stack()
 413
 414
 415         def reply(self, chan, user, msg):
 416                 if chan is not None and (isinstance(chan, self.parent.Channel) or (isinstance(chan, stringbase) and chan[0] == "#")):
 417                         self.msg(chan, "%s: %s" % (user, msg))
 418                 else:
 419                         self.msg(user, msg)
 420
 421         """
 422                 Does the work for msg/slowmsg/fastmsg. Uses the append_callback to append to the correct queue.
 423
 424                 In the case of fastmsg, self.conn.exceeded may be True, however, in this case append_callback=self.conn.send, so it will still be sent immediately.
 425         """
 426         def _msg(self, target, msg, truncate, append_callback, msgtype):
 427                 if self.parent.cfg.getboolean('erebus', 'nofakelag'): append_callback = self.conn.send
 428
 429                 cmd = self._formatmsg(target, msg, msgtype)
 430                 # The max length is much shorter than conn.maxlen (510) because of the length the server adds on about the source (us).
 431                 # If you know your hostmask, you can of course figure the exact length, but it's very difficult to reliably know your hostmask.
 432                 maxlen = self.maxmsglen()
 433                 if len(cmd) > maxlen:
 434                         if not truncate:
 435                                 return False
 436                         else:
 437                                 cmd = cmd[:maxlen]
 438
 439                 if self.conn.exceeded or self.conn.bytessent+len(cmd) >= self.conn.recvq:
 440                         append_callback(cmd)
 441                 else:
 442                         self.conn.send(cmd)
 443
 444                 self.conn.exceeded = True
 445                 return True
 446
 447         def msg(self, target, msg, truncate=False, *, msgtype=None):
 448                 """msgtype must be a valid IRC command, i.e. NOTICE or PRIVMSG; or leave as None to use default"""
 449                 return self._msg(target, msg, truncate, self.msgqueue.append, msgtype)
 450
 451         def slowmsg(self, target, msg, truncate=False, *, msgtype=None):
 452                 return self._msg(target, msg, truncate, self.slowmsgqueue.append, msgtype)
 453
 454         def fastmsg(self, target, msg, truncate=False, *, msgtype=None):
 455                 return self._msg(target, msg, truncate, self.conn.send, msgtype)
 456
 457         def _formatmsg(self, target, msg, msgtype):
 458                 if target is None or msg is None:
 459                         return self.__debug_nomsg(target, msg)
 460
 461                 target = str(target)
 462
 463                 if msgtype is not None: command = "%s %s :%s" % (msgtype, target, msg)
 464                 elif target.startswith('#'): command = "PRIVMSG %s :%s" % (target, msg)
 465                 else: command = "NOTICE %s :%s" % (target, msg)
 466
 467                 return command
 468
 469         def _popmsg(self):
 470                 self._makemsgtimer()
 471                 self.conn.bytessent -= self.conn.recvq/3
 472                 if self.conn.bytessent < 0: self.conn.bytessent = 0
 473                 self.conn.exceeded = True
 474
 475                 cmd = None
 476                 try:
 477                         cmd = self.msgqueue.popleft()
 478                 except IndexError:
 479                         try:
 480                                 cmd = self.slowmsgqueue.popleft()
 481                         except IndexError:
 482                                 pass
 483
 484                 if cmd is not None:
 485                         if self.conn.bytessent+len(cmd) > self.conn.recvq: # If it's too long
 486                                 if len(cmd) > self.conn.recvq: # Is the command itself somehow over max length???
 487                                         self._msgtimer.start()
 488                                         raise ValueError('Somehow a command that was too long made it into the message queue. Uhoh!', cmd)
 489                                         # Discard the message.
 490                                 self.msgqueue.appendleft(cmd) # Phew, we've just sent too much recently. Put it (back) on the (primary) queue.
 491                         else:
 492                                 self.conn.send(cmd)
 493
 494                 self._msgtimer.start()
 495
 496         def _makemsgtimer(self):
 497                 self._msgtimer = MyTimer(3, self._popmsg)
 498
 499         def join(self, chan):
 500                 self.conn.send("JOIN %s" % (chan))
 501
 502         def part(self, chan):
 503                 self.conn.send("PART %s" % (chan))
 504
 505         def quit(self, reason="Shutdown"):
 506                 self.conn.send("QUIT :%s" % (reason))
 507
 508         def maxmsglen(self):
 509                 return (
 510                         self.maxlen
 511                         - 63 # max hostname len
 512                         - 11 # max ident len
 513                         - 3  # the symbols in :nick!user@host
 514                         - len(self.nick)
 515                 )
 516
 517         def __str__(self): return self.nick
 518         def __repr__(self): return "<Bot %r>" % (self.nick)
 519
 520 class BotConnection(object):
 521         def __init__(self, parent, bind, server, port):
 522                 self.parent = parent
 523                 self.buffer = bytearray()
 524                 self.socket = None
 525
 526                 self.bind = bind
 527                 self.server = server
 528                 self.port = int(port)
 529
 530                 self.state = 0 # 0=disconnected, 1=registering, 2=connected
 531
 532                 self.bytessent = 0
 533                 self.recvq = 510 # How much we can send per period
 534                 self.exceeded = False
 535                 self._nowrite = False
 536
 537         def connect(self):
 538                 if self.parent.parent.cfg.getboolean('erebus', 'tls'):
 539                         import ssl
 540                         undersocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 541                         context = ssl.create_default_context()
 542                         self.socket = context.wrap_socket(undersocket, server_hostname=self.server)
 543                 else:
 544                         self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 545                 self.socket.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1) # Does Python make SOL_TCP portable? Who knows, it's not documented, and it appears to come from the _socket C lib.
 546                 self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, struct.pack('ii', 0, 0))
 547                 self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
 548                 self.socket.bind((self.bind, 0))
 549                 self.socket.connect((self.server, self.port))
 550                 return True
 551         def register(self):
 552                 if self.state == 0:
 553                         self.send("NICK %s" % (self.parent.nick))
 554                         self.send("USER %s 0 * :%s" % (self.parent.user, self.parent.realname))
 555                         self.state = 1
 556                 return True
 557
 558         def registered(self, done=False):
 559                 if done: self.state = 2
 560                 return self.state == 2
 561
 562         def send(self, line):
 563                 if not self._nowrite:
 564                         if self.parent.parent.cfg.getboolean('debug', 'io'):
 565                                 self.parent.log('O', line)
 566                         self.bytessent += len(line)
 567                         try:
 568                                 self._write(line)
 569                         except socket.error as e:
 570                                 self._nowrite = True
 571                                 self.parent._goterror(repr(e))
 572                 else:
 573                         if self.parent.parent.cfg.getboolean('debug', 'io'):
 574                                 self.parent.log('X', line)
 575
 576         def _write(self, line):
 577                 self.socket.sendall(line.encode('utf-8', 'backslashreplace')+b"\r\n")
 578
 579         def _getsockerr(self):
 580                 try: # SO_ERROR might not exist on all platforms
 581                         return self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
 582                 except:
 583                         return None
 584
 585         def read(self):
 586                 recvd = self.socket.recv(8192)
 587                 if recvd == b"":
 588                         raise EOFError("socket.recv returned empty", self.parent.nick, self._getsockerr())
 589                 self.buffer += recvd
 590                 lines = []
 591
 592                 while b"\r\n" in self.buffer:
 593                         pieces = self.buffer.split(b"\r\n", 1)
 594                         lines.append(pieces[0].decode('utf-8', 'backslashreplace'))
 595                         self.buffer = pieces[1]
 596
 597                 return lines
 598
 599         def __str__(self): return self.parent.nick
 600         def __repr__(self): return "<BotConnection %r (%r)>" % (self.socket.fileno(), self.parent.nick)