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, justjoined=True)
 243                         chan.userjoin(user)
 244                         user.join(chan)
 245         def _clientLeft(self, nick, chan):
 246                 if nick != self.nick:
 247                         gone = self.parent.user(nick).part(chan)
 248                         chan.userpart(self.parent.user(nick))
 249                         if gone:
 250                                 self.parent.user(nick).quit()
 251                                 del self.parent.users[nick.lower()]
 252         def _gotpart(self, pieces):
 253                 nick = pieces[0].split('!')[0][1:]
 254                 chan = self.parent.channel(pieces[2])
 255                 self._clientLeft(nick, chan)
 256         def _gotkick(self, pieces):
 257                 nick = pieces[3]
 258                 chan = self.parent.channel(pieces[2])
 259                 self._clientLeft(nick, chan)
 260         def _gotquit(self, pieces):
 261                 nick = pieces[0].split('!')[0][1:]
 262                 if nick != self.nick:
 263                         for chan in self.parent.user(nick).chans:
 264                                 chan.userpart(self.parent.user(nick))
 265                         self.parent.user(nick).quit()
 266                         del self.parent.users[nick.lower()]
 267         def _gotnick(self, pieces):
 268                 oldnick = pieces[0].split('!')[0][1:]
 269                 newnick = pieces[2][1:]
 270                 if oldnick == self.nick:
 271                         self.nick = newnick
 272                 else:
 273                         if newnick.lower() != oldnick.lower():
 274                                 self.parent.users[newnick.lower()] = self.parent.users[oldnick.lower()]
 275                                 del self.parent.users[oldnick.lower()]
 276                         self.parent.users[newnick.lower()].nickchange(newnick)
 277         def _gotmode(self, pieces):
 278                 source = pieces[0].split('!')[0][1:]
 279                 chan = pieces[2]
 280                 if not chan.startswith("#"): return
 281                 chan = self.parent.channel(pieces[2])
 282                 mode = pieces[3]
 283                 args = pieces[4:]
 284
 285                 adding = True
 286                 for c in mode:
 287                         if c == '+':
 288                                 adding = True
 289                         elif c == '-':
 290                                 adding = False
 291                         elif c == 'o':
 292                                 if adding:
 293                                         chan.userop(self.parent.user(args.pop(0)))
 294                                 else:
 295                                         chan.userdeop(self.parent.user(args.pop(0)))
 296                         elif c == 'v':
 297                                 if adding:
 298                                         chan.uservoice(self.parent.user(args.pop(0)))
 299                                 else:
 300                                         chan.userdevoice(self.parent.user(args.pop(0)))
 301                         else:
 302                                 pass # don't care about other modes
 303
 304         def _cbexception(self, source, *args, chained=False, **kwargs):
 305                 if not chained: # skip hooks if we were caused by a hook
 306                         exc = sys.exception()
 307                         if self.parent.hasexceptionhook(exc):
 308                                 for callback in self.parent.getexceptionhook(exc):
 309                                         try:
 310                                                 callback(self, exc, source, *args, **kwargs)
 311                                         except Exception:
 312                                                 self._cbexception('exceptionhook', chained=True, module=callback.__module__, function=callback.__name__, underlying=(source, args, kwargs))
 313                 if self.parent.cfg.getboolean('debug', 'cbexc'):
 314                         self.conn.send("PRIVMSG %s :%09.3f \ 34\1f!!! CBEXC\1f\ 3 %s" % (self.parent.cfg.get('debug', 'owner'), time.time() % 100000, source))
 315                         traceback.print_exc(chain=not chained)
 316                         self.log('!', "CBEXC %s %r %r" % (source, args, kwargs))
 317
 318
 319         def parsemsg(self, user, target, msg):
 320                 if user.glevel <= -2: return # short circuit if user is IGNORED
 321                 chan = None
 322                 chanparam = None # was the channel specified as part of the command?
 323                 if len(msg) == 0:
 324                         return
 325
 326                 if target == self.nick:
 327                         if msg.startswith("\001"): #ctcp
 328                                 msg = msg.strip("\001")
 329                                 if msg == "VERSION":
 330                                         self.msg(user, "\001VERSION Erebus v%d.%d - http://jfr.im/git/erebus.git" % (self.parent.APIVERSION, self.parent.RELEASE))
 331                                 return
 332
 333                 triggerused = msg.startswith(self.parent.trigger)
 334                 if triggerused: msg = msg[len(self.parent.trigger):]
 335                 pieces = msg.split()
 336
 337                 if len(pieces) == 0:
 338                         return
 339
 340                 if target != self.nick: # message was sent to a channel
 341                         try:
 342                                 if pieces[0][:-1].lower() == self.nick.lower() and (pieces[0][-1] == ":" or pieces[0][-1] == ","):
 343                                         pieces.pop(0) # command actually starts with next word
 344                                         if len(pieces) == 0: # is there still anything left?
 345                                                 return
 346                                         msg = ' '.join(pieces)
 347                                         triggerused = True
 348                         except IndexError:
 349                                 return # "message" is empty
 350
 351                 if len(pieces) > 1:
 352                         chanword = pieces[1]
 353                         if chanword.startswith('#'):
 354                                 chanparam = self.parent.channel(chanword)
 355
 356                 if target != self.nick: # message was sent to a channel
 357                         chan = self.parent.channel(target)
 358                         if not triggerused:
 359                                 if self.parent.haschanhook(target.lower()):
 360                                         for callback in self.parent.getchanhook(target.lower()):
 361                                                 try:
 362                                                         cbret = callback(self, user, chan, *pieces)
 363                                                         if isinstance(cbret, stringbase):
 364                                                                 self.reply(target, user, cbret)
 365                                                 except:
 366                                                         self.msg(user, "Command failed. Code: CBEXC%09.3f" % (time.time() % 100000))
 367                                                         self._cbexception("chanhook", user=user, target=target, msg=msg)
 368                                 return # not to bot, don't process!
 369
 370                 cmd = pieces[0].lower()
 371                 rancmd = False
 372                 if self.parent.hashook(cmd):
 373                         for callback in self.parent.gethook(cmd):
 374                                 if chanparam is not None and (callback.needchan or callback.wantchan):
 375                                         chan = chanparam
 376                                         pieces.pop(1)
 377                                 if chan is None and callback.needchan:
 378                                         rancmd = True
 379                                         self.msg(user, "You need to specify a channel for that command.")
 380                                 elif user.glevel >= callback.reqglevel and (not callback.needchan or chan.levelof(user.auth) >= callback.reqclevel):
 381                                         rancmd = True
 382                                         try:
 383                                                 cbret = callback(self, user, chan, target, *pieces[1:])
 384                                                 if isinstance(cbret, stringbase):
 385                                                         self.reply(target, user, cbret)
 386                                         except Exception:
 387                                                 self.msg(user, "Command failed. Code: CBEXC%09.3f" % (time.time() % 100000))
 388                                                 self._cbexception("hook", user=user, target=target, msg=msg)
 389                                         except SystemExit as e:
 390                                                 self.parent.mustquit = e
 391                                                 try:
 392                                                         curs = self.parent.query("UPDATE bots SET connected = 0")
 393                                                         curs.close()
 394                                                 except: pass
 395                                                 raise e
 396                 else:
 397                         rancmd = True
 398                         self.msg(user, "I don't know that command.")
 399                 if not rancmd:
 400                         self.msg(user, "You don't have enough access to run that command.")
 401
 402         def __debug_nomsg(self, target, msg):
 403                 if self.parent.cfg.getboolean('debug', 'nomsg'):
 404                         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))
 405                         self.log('!', "!!! NOMSG")
 406 #                       print "%09.3f %s [!] %s" % (time.time() % 100000, self.nick, "!!! NOMSG")
 407                         traceback.print_stack()
 408
 409
 410         def reply(self, chan, user, msg):
 411                 if chan is not None and (isinstance(chan, self.parent.Channel) or (isinstance(chan, stringbase) and chan[0] == "#")):
 412                         self.msg(chan, "%s: %s" % (user, msg))
 413                 else:
 414                         self.msg(user, msg)
 415
 416         """
 417                 Does the work for msg/slowmsg/fastmsg. Uses the append_callback to append to the correct queue.
 418
 419                 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.
 420         """
 421         def _msg(self, target, msg, truncate, append_callback, msgtype):
 422                 if self.parent.cfg.getboolean('erebus', 'nofakelag'): append_callback = self.conn.send
 423
 424                 cmd = self._formatmsg(target, msg, msgtype)
 425                 # The max length is much shorter than conn.maxlen (510) because of the length the server adds on about the source (us).
 426                 # If you know your hostmask, you can of course figure the exact length, but it's very difficult to reliably know your hostmask.
 427                 maxlen = self.maxmsglen()
 428                 if len(cmd) > maxlen:
 429                         if not truncate:
 430                                 return False
 431                         else:
 432                                 cmd = cmd[:maxlen]
 433
 434                 if self.conn.exceeded or self.conn.bytessent+len(cmd) >= self.conn.recvq:
 435                         append_callback(cmd)
 436                 else:
 437                         self.conn.send(cmd)
 438
 439                 self.conn.exceeded = True
 440                 return True
 441
 442         def msg(self, target, msg, truncate=False, *, msgtype=None):
 443                 """msgtype must be a valid IRC command, i.e. NOTICE or PRIVMSG; or leave as None to use default"""
 444                 return self._msg(target, msg, truncate, self.msgqueue.append, msgtype)
 445
 446         def slowmsg(self, target, msg, truncate=False, *, msgtype=None):
 447                 return self._msg(target, msg, truncate, self.slowmsgqueue.append, msgtype)
 448
 449         def fastmsg(self, target, msg, truncate=False, *, msgtype=None):
 450                 return self._msg(target, msg, truncate, self.conn.send, msgtype)
 451
 452         def _formatmsg(self, target, msg, msgtype):
 453                 if target is None or msg is None:
 454                         return self.__debug_nomsg(target, msg)
 455
 456                 target = str(target)
 457
 458                 if msgtype is not None: command = "%s %s :%s" % (msgtype, target, msg)
 459                 elif target.startswith('#'): command = "PRIVMSG %s :%s" % (target, msg)
 460                 else: command = "NOTICE %s :%s" % (target, msg)
 461
 462                 return command
 463
 464         def _popmsg(self):
 465                 self._makemsgtimer()
 466                 self.conn.bytessent -= self.conn.recvq/3
 467                 if self.conn.bytessent < 0: self.conn.bytessent = 0
 468                 self.conn.exceeded = True
 469
 470                 cmd = None
 471                 try:
 472                         cmd = self.msgqueue.popleft()
 473                 except IndexError:
 474                         try:
 475                                 cmd = self.slowmsgqueue.popleft()
 476                         except IndexError:
 477                                 pass
 478
 479                 if cmd is not None:
 480                         if self.conn.bytessent+len(cmd) > self.conn.recvq: # If it's too long
 481                                 if len(cmd) > self.conn.recvq: # Is the command itself somehow over max length???
 482                                         self._msgtimer.start()
 483                                         raise ValueError('Somehow a command that was too long made it into the message queue. Uhoh!', cmd)
 484                                         # Discard the message.
 485                                 self.msgqueue.appendleft(cmd) # Phew, we've just sent too much recently. Put it (back) on the (primary) queue.
 486                         else:
 487                                 self.conn.send(cmd)
 488
 489                 self._msgtimer.start()
 490
 491         def _makemsgtimer(self):
 492                 self._msgtimer = MyTimer(3, self._popmsg)
 493
 494         def join(self, chan):
 495                 self.conn.send("JOIN %s" % (chan))
 496
 497         def part(self, chan):
 498                 self.conn.send("PART %s" % (chan))
 499
 500         def quit(self, reason="Shutdown"):
 501                 self.conn.send("QUIT :%s" % (reason))
 502
 503         def maxmsglen(self):
 504                 return (
 505                         self.maxlen
 506                         - 63 # max hostname len
 507                         - 11 # max ident len
 508                         - 3  # the symbols in :nick!user@host
 509                         - len(self.nick)
 510                 )
 511
 512         def __str__(self): return self.nick
 513         def __repr__(self): return "<Bot %r>" % (self.nick)
 514
 515 class BotConnection(object):
 516         def __init__(self, parent, bind, server, port):
 517                 self.parent = parent
 518                 self.buffer = bytearray()
 519                 self.socket = None
 520
 521                 self.bind = bind
 522                 self.server = server
 523                 self.port = int(port)
 524
 525                 self.state = 0 # 0=disconnected, 1=registering, 2=connected
 526
 527                 self.bytessent = 0
 528                 self.recvq = 510 # How much we can send per period
 529                 self.exceeded = False
 530                 self._nowrite = False
 531
 532         def connect(self):
 533                 if self.parent.parent.cfg.getboolean('erebus', 'tls'):
 534                         import ssl
 535                         undersocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 536                         context = ssl.create_default_context()
 537                         self.socket = context.wrap_socket(undersocket, server_hostname=self.server)
 538                 else:
 539                         self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 540                 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.
 541                 self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, struct.pack('ii', 0, 0))
 542                 self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
 543                 self.socket.bind((self.bind, 0))
 544                 self.socket.connect((self.server, self.port))
 545                 return True
 546         def register(self):
 547                 if self.state == 0:
 548                         self.send("NICK %s" % (self.parent.nick))
 549                         self.send("USER %s 0 * :%s" % (self.parent.user, self.parent.realname))
 550                         self.state = 1
 551                 return True
 552
 553         def registered(self, done=False):
 554                 if done: self.state = 2
 555                 return self.state == 2
 556
 557         def send(self, line):
 558                 if not self._nowrite:
 559                         if self.parent.parent.cfg.getboolean('debug', 'io'):
 560                                 self.parent.log('O', line)
 561                         self.bytessent += len(line)
 562                         try:
 563                                 self._write(line)
 564                         except socket.error as e:
 565                                 self._nowrite = True
 566                                 self.parent._goterror(repr(e))
 567                 else:
 568                         if self.parent.parent.cfg.getboolean('debug', 'io'):
 569                                 self.parent.log('X', line)
 570
 571         def _write(self, line):
 572                 self.socket.sendall(line.encode('utf-8', 'backslashreplace')+b"\r\n")
 573
 574         def _getsockerr(self):
 575                 try: # SO_ERROR might not exist on all platforms
 576                         return self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
 577                 except:
 578                         return None
 579
 580         def read(self):
 581                 recvd = self.socket.recv(8192)
 582                 if recvd == b"":
 583                         raise EOFError("socket.recv returned empty", self.parent.nick, self._getsockerr())
 584                 self.buffer += recvd
 585                 lines = []
 586
 587                 while b"\r\n" in self.buffer:
 588                         pieces = self.buffer.split(b"\r\n", 1)
 589                         lines.append(pieces[0].decode('utf-8', 'backslashreplace'))
 590                         self.buffer = pieces[1]
 591
 592                 return lines
 593
 594         def __str__(self): return self.parent.nick
 595         def __repr__(self): return "<BotConnection %r (%r)>" % (self.socket.fileno(), self.parent.nick)