3 irkerd - a simple IRC multiplexer daemon
5 Listens for JSON objects of the form {'to':<irc-url>, 'privmsg':<text>}
6 and relays messages to IRC channels. Each request must be followed by
9 The <text> must be a string. The value of the 'to' attribute can be a
10 string containing an IRC URL (e.g. 'irc://chat.freenet.net/botwar') or
11 a list of such strings; in the latter case the message is broadcast to
12 all listed channels. Note that the channel portion of the URL need
13 *not* have a leading '#' unless the channel name itself does.
15 Design and code by Eric S. Raymond <esr@thyrsus.com>. See the project
16 resource page at <http://www.catb.org/~esr/irker/>.
18 Requires Python 2.7, or:
19 * 2.6 with the argparse package installed.
20 * 2.5 with the argparse and simplejson packages installed.
23 from __future__ import with_statement
25 # These things might need tuning
30 XMIT_TTL = (3 * 60 * 60) # Time to live, seconds from last transmit
31 PING_TTL = (15 * 60) # Time to live, seconds from last PING
32 HANDSHAKE_TTL = 60 # Time to live, seconds from nick transmit
33 CHANNEL_TTL = (3 * 60 * 60) # Time to live, seconds from last transmit
34 DISCONNECT_TTL = (24 * 60 * 60) # Time to live, seconds from last connect
35 UNSEEN_TTL = 60 # Time to live, seconds since first request
36 CHANNEL_MAX = 18 # Max channels open per socket (default)
37 ANTI_FLOOD_DELAY = 1.0 # Anti-flood delay after transmissions, seconds
38 ANTI_BUZZ_DELAY = 0.09 # Anti-buzz delay after queue-empty check
39 CONNECTION_MAX = 200 # To avoid hitting a thread limit
41 # No user-serviceable parts below this line
50 import simplejson as json # Faster, also makes us Python-2.4-compatible
64 LOG = logging.getLogger(__name__)
65 LOG.setLevel(logging.ERROR)
66 LOG_LEVELS = ['critical', 'error', 'warning', 'info', 'debug']
69 # Sketch of implementation:
71 # One Irker object manages multiple IRC sessions. It holds a map of
72 # Dispatcher objects, one per (server, port) combination, which are
73 # responsible for routing messages to one of any number of Connection
74 # objects that do the actual socket conversations. The reason for the
75 # Dispatcher layer is that IRC daemons limit the number of channels a
76 # client (that is, from the daemon's point of view, a socket) can be
77 # joined to, so each session to a server needs a flock of Connection
78 # instances each with its own socket.
80 # Connections are timed out and removed when either they haven't seen a
81 # PING for a while (indicating that the server may be stalled or down)
82 # or there has been no message traffic to them for a while, or
83 # even if the queue is nonempty but efforts to connect have failed for
86 # There are multiple threads. One accepts incoming traffic from all
87 # servers. Each Connection also has a consumer thread and a
88 # thread-safe message queue. The program main appends messages to
89 # queues as JSON requests are received; the consumer threads try to
90 # ship them to servers. When a socket write stalls, it only blocks an
91 # individual consumer thread; if it stalls long enough, the session
92 # will be timed out. This solves the biggest problem with a
93 # single-threaded implementation, which is that you can't count on a
94 # single stalled write not hanging all other traffic - you're at the
95 # mercy of the length of the buffers in the TCP/IP layer.
97 # Message delivery is thus not reliable in the face of network stalls,
98 # but this was considered acceptable because IRC (notoriously) has the
99 # same problem - there is little point in reliable delivery to a relay
100 # that is down or unreliable.
102 # This code uses only NICK, JOIN, PART, MODE, PRIVMSG, USER, and QUIT.
103 # It is strictly compliant to RFC1459, except for the interpretation and
104 # use of the DEAF and CHANLIMIT and (obsolete) MAXCHANNELS features.
106 # CHANLIMIT is as described in the Internet RFC draft
107 # draft-brocklesby-irc-isupport-03 at <http://www.mirc.com/isupport.html>.
108 # The ",isnick" feature is as described in
109 # <http://ftp.ics.uci.edu/pub/ietf/uri/draft-mirashi-url-irc-01.txt>.
111 # Historical note: the IRCClient and IRCServerConnection classes
112 # (~270LOC) replace the overweight, overcomplicated 3KLOC mass of
113 # irclib code that irker formerly used as a service library. They
114 # still look similar to parts of irclib because I contributed to that
115 # code before giving up on it.
117 class IRCError(Exception):
122 class InvalidRequest (ValueError):
123 "An invalid JSON request"
128 "An IRC client session to one or more servers."
130 self.mutex = threading.RLock()
131 self.server_connections = []
132 self.event_handlers = {}
133 self.add_event_handler("ping",
134 lambda c, e: c.ship("PONG %s" % e.target))
137 "Initialize a new server-connection object."
138 conn = IRCServerConnection(self)
140 self.server_connections.append(conn)
143 def spin(self, timeout=0.2):
144 "Spin processing data from connections forever."
145 # Outer loop should specifically *not* be mutex-locked.
146 # Otherwise no other thread would ever be able to change
147 # the shared state of an IRC object running this function.
151 connected = [x for x in self.server_connections
152 if x is not None and x.socket is not None]
153 sockets = [x.socket for x in connected]
155 connmap = dict([(c.socket.fileno(), c) for c in connected])
156 (insocks, _o, _e) = select.select(sockets, [], [], timeout)
158 connmap[s.fileno()].consume()
161 time.sleep(nextsleep)
163 def add_event_handler(self, event, handler):
164 "Set a handler to be called later."
166 event_handlers = self.event_handlers.setdefault(event, [])
167 event_handlers.append(handler)
169 def handle_event(self, connection, event):
171 h = self.event_handlers
172 th = sorted(h.get("all_events", []) + h.get(event.type, []))
174 handler(connection, event)
176 def drop_connection(self, connection):
178 self.server_connections.remove(connection)
181 class LineBufferedStream():
182 "Line-buffer a read stream."
183 crlf_re = re.compile(b'\r?\n')
188 def append(self, newbytes):
189 self.buffer += newbytes
192 "Iterate over lines in the buffer."
193 lines = LineBufferedStream.crlf_re.split(self.buffer)
194 self.buffer = lines.pop()
200 class IRCServerConnectionError(IRCError):
203 class IRCServerConnection():
204 command_re = re.compile("^(:(?P<prefix>[^ ]+) +)?(?P<command>[^ ]+)( *(?P<argument> .+))?")
205 # The full list of numeric-to-event mappings is in Perl's Net::IRC.
206 # We only need to ensure that if some ancient server throws numerics
207 # for the ones we actually want to catch, they're mapped.
210 "005": "featurelist",
211 "432": "erroneusnickname",
212 "433": "nicknameinuse",
213 "436": "nickcollision",
214 "437": "unavailresource",
217 def __init__(self, master):
221 def connect(self, target, nickname,
222 password=None, username=None, ircname=None):
223 LOG.debug("connect(server=%r, port=%r, nickname=%r, ...)" % (
224 target.servername, target.port, nickname))
225 if self.socket is not None:
226 self.disconnect("Changing servers")
228 self.buffer = LineBufferedStream()
229 self.event_handlers = {}
230 self.real_server_name = ""
232 self.nickname = nickname
234 self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
235 self.socket.bind(('', 0))
236 self.socket.connect((target.servername, target.port))
237 except socket.error as err:
238 raise IRCServerConnectionError("Couldn't connect to socket: %s" % err)
241 self.ship("PASS " + password)
242 self.nick(self.nickname)
243 self.user(username=username or ircname, realname=ircname or nickname)
247 # Without this thread lock, there is a window during which
248 # select() can find a closed socket, leading to an EBADF error.
249 with self.master.mutex:
250 self.disconnect("Closing object")
251 self.master.drop_connection(self)
255 incoming = self.socket.recv(16384)
257 # Server hung up on us.
258 self.disconnect("Connection reset by peer")
261 # Dead air also indicates a connection reset.
262 self.disconnect("Connection reset by peer")
265 self.buffer.append(incoming)
267 for line in self.buffer:
268 LOG.debug("FROM: %s" % line)
276 self.handle_event(Event("every_raw_message",
277 self.real_server_name,
281 m = IRCServerConnection.command_re.match(line)
282 if m.group("prefix"):
283 prefix = m.group("prefix")
284 if not self.real_server_name:
285 self.real_server_name = prefix
286 if m.group("command"):
287 command = m.group("command").lower()
288 if m.group("argument"):
289 a = m.group("argument").split(" :", 1)
290 arguments = a[0].split()
292 arguments.append(a[1])
294 command = IRCServerConnection.codemap.get(command, command)
295 if command in ["privmsg", "notice"]:
296 target = arguments.pop(0)
300 if command == "quit":
301 arguments = [arguments[0]]
302 elif command == "ping":
303 target = arguments[0]
305 target = arguments[0]
306 arguments = arguments[1:]
308 LOG.debug("command: %s, source: %s, target: %s, arguments: %s" % (
309 command, prefix, target, arguments))
310 self.handle_event(Event(command, prefix, target, arguments))
312 def handle_event(self, event):
313 self.master.handle_event(self, event)
314 if event.type in self.event_handlers:
315 for fn in self.event_handlers[event.type]:
318 def is_connected(self):
319 return self.socket is not None
321 def disconnect(self, message=""):
322 if self.socket is None:
324 # Don't send a QUIT here - causes infinite loop!
326 self.socket.shutdown(socket.SHUT_WR)
333 Event("disconnect", self.target.server, "", [message]))
335 def join(self, channel, key=""):
336 self.ship("JOIN %s%s" % (channel, (key and (" " + key))))
338 def mode(self, target, command):
339 self.ship("MODE %s %s" % (target, command))
341 def nick(self, newnick):
342 self.ship("NICK " + newnick)
344 def part(self, channel, message=""):
345 cmd_parts = ['PART', channel]
347 cmd_parts.append(message)
348 self.ship(' '.join(cmd_parts))
350 def privmsg(self, target, text):
351 self.ship("PRIVMSG %s :%s" % (target, text))
353 def quit(self, message=""):
354 self.ship("QUIT" + (message and (" :" + message)))
356 def user(self, username, realname):
357 self.ship("USER %s 0 * :%s" % (username, realname))
359 def ship(self, string):
360 "Ship a command to the server, appending CR/LF"
362 self.socket.send(string.encode('utf-8') + b'\r\n')
363 LOG.debug("TO: %s" % string)
365 self.disconnect("Connection reset by peer.")
368 def __init__(self, evtype, source, target, arguments=None):
372 if arguments is None:
374 self.arguments = arguments
376 def is_channel(string):
377 return string and string[0] in "#&+!"
380 def __init__(self, irker, target, nick_template, nick_needs_number=False,
381 password=None, **kwargs):
384 self.nick_template = nick_template
385 self.nick_needs_number = nick_needs_number
386 self.password = password
388 self.nick_trial = None
389 self.connection = None
391 self.last_xmit = time.time()
392 self.last_ping = time.time()
393 self.channels_joined = {}
394 self.channel_limits = {}
395 # The consumer thread
396 self.queue = Queue.Queue()
398 def nickname(self, n=None):
399 "Return a name for the nth server connection."
402 if self.nick_needs_number:
403 return (self.nick_template % n)
405 return self.nick_template
406 def handle_ping(self):
407 "Register the fact that the server has pinged this connection."
408 self.last_ping = time.time()
409 def handle_welcome(self):
410 "The server says we're OK, with a non-conflicting nick."
411 self.status = "ready"
412 LOG.info("nick %s accepted" % self.nickname())
414 self.connection.privmsg("nickserv", "identify %s" % self.password)
415 def handle_badnick(self):
416 "The server says our nick is ill-formed or has a conflict."
417 LOG.info("nick %s rejected" % self.nickname())
418 if self.nick_needs_number:
419 # Randomness prevents a malicious user or bot from
420 # anticipating the next trial name in order to block us
421 # from completing the handshake.
422 self.nick_trial += random.randint(1, 3)
423 self.last_xmit = time.time()
424 self.connection.nick(self.nickname())
425 # Otherwise fall through, it might be possible to
427 def handle_disconnect(self):
428 "Server disconnected us for flooding or some other reason."
429 self.connection = None
430 if self.status != "expired":
431 self.status = "disconnected"
432 def handle_kick(self, outof):
434 self.status = "handshaking"
436 del self.channels_joined[outof]
438 LOG.error("kicked by %s from %s that's not joined" % (
441 while not self.queue.empty():
442 (channel, message, key) = self.queue.get()
444 qcopy.append((channel, message, key))
445 for (channel, message, key) in qcopy:
446 self.queue.put((channel, message, key))
447 self.status = "ready"
448 def enqueue(self, channel, message, key, quit_after=False):
449 "Enque a message for transmission."
450 if self.thread is None or not self.thread.is_alive():
451 self.status = "unseen"
452 self.thread = threading.Thread(target=self.dequeue)
453 self.thread.setDaemon(True)
455 self.queue.put((channel, message, key))
457 self.queue.put((channel, None, key))
459 "Try to ship pending messages from the queue."
462 # We want to be kind to the IRC servers and not hold unused
463 # sockets open forever, so they have a time-to-live. The
464 # loop is coded this particular way so that we can drop
465 # the actual server connection when its time-to-live
466 # expires, then reconnect and resume transmission if the
467 # queue fills up again.
468 if self.queue.empty():
469 # Queue is empty, at some point we want to time out
470 # the connection rather than holding a socket open in
471 # the server forever.
473 xmit_timeout = now > self.last_xmit + XMIT_TTL
474 ping_timeout = now > self.last_ping + PING_TTL
475 if self.status == "disconnected":
476 # If the queue is empty, we can drop this connection.
477 self.status = "expired"
479 elif xmit_timeout or ping_timeout:
481 "timing out connection to %s at %s "
482 "(ping_timeout=%s, xmit_timeout=%s)") % (
483 self.target, time.asctime(), ping_timeout,
485 with self.irker.irc.mutex:
486 self.connection.context = None
487 self.connection.quit("transmission timeout")
488 self.connection = None
489 self.status = "disconnected"
491 # Prevent this thread from hogging the CPU by pausing
492 # for just a little bit after the queue-empty check.
493 # As long as this is less that the duration of a human
494 # reflex arc it is highly unlikely any human will ever
496 time.sleep(ANTI_BUZZ_DELAY)
497 elif self.status == "disconnected" \
498 and time.time() > self.last_xmit + DISCONNECT_TTL:
499 # Queue is nonempty, but the IRC server might be
500 # down. Letting failed connections retain queue
501 # space forever would be a memory leak.
502 self.status = "expired"
504 elif not self.connection and self.status != "expired":
505 # Queue is nonempty but server isn't connected.
506 with self.irker.irc.mutex:
507 self.connection = self.irker.irc.newserver()
508 self.connection.context = self
509 # Try to avoid colliding with other instances
510 self.nick_trial = random.randint(1, 990)
511 self.channels_joined = {}
514 # IRCServerConnectionError on failure
515 self.connection.connect(
517 nickname=self.nickname(),
519 ircname="irker relaying client",
521 self.status = "handshaking"
522 LOG.info("XMIT_TTL bump (%s connection) at %s" % (
523 self.target, time.asctime()))
524 self.last_xmit = time.time()
525 self.last_ping = time.time()
526 except IRCServerConnectionError:
527 self.status = "expired"
529 elif self.status == "handshaking":
530 if time.time() > self.last_xmit + HANDSHAKE_TTL:
531 self.status = "expired"
534 # Don't buzz on the empty-queue test while we're
536 time.sleep(ANTI_BUZZ_DELAY)
537 elif self.status == "unseen" \
538 and time.time() > self.last_xmit + UNSEEN_TTL:
539 # Nasty people could attempt a denial-of-service
540 # attack by flooding us with requests with invalid
541 # servernames. We guard against this by rapidly
542 # expiring connections that have a nonempty queue but
543 # have never had a successful open.
544 self.status = "expired"
546 elif self.status == "ready":
547 (channel, message, key) = self.queue.get()
548 if channel not in self.channels_joined:
549 self.connection.join(channel, key=key)
550 LOG.info("joining %s on %s." % (channel, self.target))
551 # None is magic - it's a request to quit the server
553 self.connection.quit()
554 # An empty message might be used as a keepalive or
555 # to join a channel for logging, so suppress the
556 # privmsg send unless there is actual traffic.
558 for segment in message.split("\n"):
559 # Truncate the message if it's too long,
560 # but we're working with characters here,
561 # not bytes, so we could be off.
562 # 500 = 512 - CRLF - 'PRIVMSG ' - ' :'
563 maxlength = 500 - len(channel)
564 if len(segment) > maxlength:
565 segment = segment[:maxlength]
567 self.connection.privmsg(channel, segment)
568 except ValueError as err:
570 "irclib rejected a message to %s on %s "
572 channel, self.target, str(err)))
573 LOG.debug(err.format_exc())
574 time.sleep(ANTI_FLOOD_DELAY)
575 self.last_xmit = self.channels_joined[channel] = time.time()
576 LOG.info("XMIT_TTL bump (%s transmission) at %s" % (
577 self.target, time.asctime()))
578 self.queue.task_done()
579 elif self.status == "expired":
580 print "We're expired but still running! This is a bug."
583 LOG.error("exception %s in thread for %s" % (e, self.target))
584 # Maybe this should have its own status?
585 self.status = "expired"
586 LOG.debug(e.format_exc())
589 # Make sure we don't leave any zombies behind
590 self.connection.close()
592 # Irclib has a habit of throwing fresh exceptions here. Ignore that
595 "Should this connection not be scavenged?"
596 return self.status != "expired"
597 def joined_to(self, channel):
598 "Is this connection joined to the specified channel?"
599 return channel in self.channels_joined
600 def accepting(self, channel):
601 "Can this connection accept a join of this channel?"
602 if self.channel_limits:
604 for already in self.channels_joined:
605 # This obscure code is because the RFCs allow separate limits
606 # by channel type (indicated by the first character of the name)
607 # a feature that is almost never actually used.
608 if already[0] == channel[0]:
610 return match_count < self.channel_limits.get(channel[0], CHANNEL_MAX)
612 return len(self.channels_joined) < CHANNEL_MAX
615 "Represent a transmission target."
616 def __init__(self, url):
618 # Pre-2.6 Pythons don't recognize irc: as a valid URL prefix.
619 url = url.replace("irc://", "http://")
620 parsed = urlparse.urlparse(url)
621 irchost, _, ircport = parsed.netloc.partition(':')
624 self.servername = irchost
625 # IRC channel names are case-insensitive. If we don't smash
626 # case here we may run into problems later. There was a bug
627 # observed on irc.rizon.net where an irkerd user specified #Channel,
628 # got kicked, and irkerd crashed because the server returned
629 # "#channel" in the notification that our kick handler saw.
630 self.channel = parsed.path.lstrip('/').lower()
631 # This deals with a tweak in recent versions of urlparse.
633 self.channel += "#" + parsed.fragment
634 isnick = self.channel.endswith(",isnick")
636 self.channel = self.channel[:-7]
637 if self.channel and not isnick and self.channel[0] not in "#&+":
638 self.channel = "#" + self.channel
639 # support both channel?secret and channel?key=secret
642 self.key = re.sub("^key=", "", parsed.query)
643 self.port = int(ircport)
646 "Represent this instance as a string"
647 return self.servername or self.url or repr(self)
650 "Raise InvalidRequest if the URL is missing a critical component"
651 if not self.servername:
652 raise InvalidRequest(
653 'target URL missing a servername: %r' % self.url)
655 raise InvalidRequest(
656 'target URL missing a channel: %r' % self.url)
658 "Return a hashable tuple representing the destination server."
659 return (self.servername, self.port)
662 "Manage connections to a particular server-port combination."
663 def __init__(self, irker, **kwargs):
666 self.connections = []
667 def dispatch(self, channel, message, key, quit_after=False):
668 "Dispatch messages for our server-port combination."
669 # First, check if there is room for another channel
670 # on any of our existing connections.
671 connections = [x for x in self.connections if x.live()]
672 eligibles = [x for x in connections if x.joined_to(channel)] \
673 or [x for x in connections if x.accepting(channel)]
675 eligibles[0].enqueue(channel, message, key, quit_after)
677 # All connections are full up. Look for one old enough to be
680 for connection in connections:
681 for (chan, age) in connections.channels_joined.items():
682 if age < time.time() - CHANNEL_TTL:
683 ancients.append((connection, chan, age))
685 ancients.sort(key=lambda x: x[2])
686 (found_connection, drop_channel, _drop_age) = ancients[0]
687 found_connection.part(drop_channel, "scavenged by irkerd")
688 del found_connection.channels_joined[drop_channel]
689 #time.sleep(ANTI_FLOOD_DELAY)
690 found_connection.enqueue(channel, message, key, quit_after)
692 # All existing channels had recent activity
693 newconn = Connection(self.irker, **self.kwargs)
694 self.connections.append(newconn)
695 newconn.enqueue(channel, message, key, quit_after)
697 "Does this server-port combination have any live connections?"
698 self.connections = [x for x in self.connections if x.live()]
699 return len(self.connections) > 0
701 "Return all connections with pending traffic."
702 return [x for x in self.connections if not x.queue.empty()]
704 "Return the time of the most recent transmission."
705 return max(x.last_xmit for x in self.connections)
708 "Persistent IRC multiplexer."
709 def __init__(self, logfile=None, **kwargs):
710 self.logfile = logfile
712 self.irc = IRCClient()
713 self.irc.add_event_handler("ping", self._handle_ping)
714 self.irc.add_event_handler("welcome", self._handle_welcome)
715 self.irc.add_event_handler("erroneusnickname", self._handle_badnick)
716 self.irc.add_event_handler("nicknameinuse", self._handle_badnick)
717 self.irc.add_event_handler("nickcollision", self._handle_badnick)
718 self.irc.add_event_handler("unavailresource", self._handle_badnick)
719 self.irc.add_event_handler("featurelist", self._handle_features)
720 self.irc.add_event_handler("disconnect", self._handle_disconnect)
721 self.irc.add_event_handler("kick", self._handle_kick)
722 self.irc.add_event_handler("every_raw_message", self._handle_every_raw_message)
724 def thread_launch(self):
725 thread = threading.Thread(target=self.irc.spin)
726 thread.setDaemon(True)
727 self.irc._thread = thread
729 def _handle_ping(self, connection, _event):
730 "PING arrived, bump the last-received time for the connection."
731 if connection.context:
732 connection.context.handle_ping()
733 def _handle_welcome(self, connection, _event):
734 "Welcome arrived, nick accepted for this connection."
735 if connection.context:
736 connection.context.handle_welcome()
737 def _handle_badnick(self, connection, _event):
738 "Nick not accepted for this connection."
739 if connection.context:
740 connection.context.handle_badnick()
741 def _handle_features(self, connection, event):
742 "Determine if and how we can set deaf mode."
743 if connection.context:
744 cxt = connection.context
745 arguments = event.arguments
746 for lump in arguments:
747 if lump.startswith("DEAF="):
749 connection.mode(cxt.nickname(), "+"+lump[5:])
750 elif lump.startswith("MAXCHANNELS="):
753 cxt.channel_limits[pref] = m
754 LOG.info("%s maxchannels is %d" % (connection.server, m))
755 elif lump.startswith("CHANLIMIT=#:"):
756 limits = lump[10:].split(",")
759 (prefixes, limit) = token.split(":")
762 cxt.channel_limits[c] = limit
763 LOG.info("%s channel limit map is %s" % (
764 connection.target, cxt.channel_limits))
766 LOG.error("ill-formed CHANLIMIT property")
767 def _handle_disconnect(self, connection, _event):
768 "Server hung up the connection."
769 LOG.info("server %s disconnected" % connection.target)
771 if connection.context:
772 connection.context.handle_disconnect()
773 def _handle_kick(self, connection, event):
774 "Server hung up the connection."
775 target = event.target
776 LOG.info("irker has been kicked from %s on %s" % (
777 target, connection.target))
778 if connection.context:
779 connection.context.handle_kick(target)
780 def _handle_every_raw_message(self, _connection, event):
781 "Log all messages when in watcher mode."
783 with open(self.logfile, "a") as logfp:
784 logfp.write("%03f|%s|%s\n" % \
785 (time.time(), event.source, event.arguments[0]))
787 "Do we have any pending message traffic?"
788 return [k for (k, v) in self.servers.items() if v.pending()]
790 def _parse_request(self, line):
791 "Request-parsing helper for the handle() method"
792 request = json.loads(line.strip())
793 if not isinstance(request, dict):
794 raise InvalidRequest(
795 "request is not a JSON dictionary: %r" % request)
796 if "to" not in request or "privmsg" not in request:
797 raise InvalidRequest(
798 "malformed request - 'to' or 'privmsg' missing: %r" % request)
799 channels = request['to']
800 message = request['privmsg']
801 if not isinstance(channels, (list, basestring)):
802 raise InvalidRequest(
803 "malformed request - unexpected channel type: %r" % channels)
804 if not isinstance(message, basestring):
805 raise InvalidRequest(
806 "malformed request - unexpected message type: %r" % message)
807 if not isinstance(channels, list):
808 channels = [channels]
812 if not isinstance(url, basestring):
813 raise InvalidRequest(
814 "malformed request - URL has unexpected type: %r" %
818 except InvalidRequest, e:
821 targets.append(target)
822 return (targets, message)
824 def handle(self, line, quit_after=False):
825 "Perform a JSON relay request."
827 targets, message = self._parse_request(line=line)
828 for target in targets:
829 if target.server() not in self.servers:
830 self.servers[target.server()] = Dispatcher(
831 self, target=target, **self.kwargs)
832 self.servers[target.server()].dispatch(
833 target.channel, message, target.key, quit_after=quit_after)
834 # GC dispatchers with no active connections
835 servernames = self.servers.keys()
836 for servername in servernames:
837 if not self.servers[servername].live():
838 del self.servers[servername]
839 # If we might be pushing a resource limit even
840 # after garbage collection, remove a session. The
841 # goal here is to head off DoS attacks that aim at
842 # exhausting thread space or file descriptors.
843 # The cost is that attempts to DoS this service
844 # will cause lots of join/leave spam as we
845 # scavenge old channels after connecting to new
846 # ones. The particular method used for selecting a
847 # session to be terminated doesn't matter much; we
848 # choose the one longest idle on the assumption
849 # that message activity is likely to be clumpy.
850 if len(self.servers) >= CONNECTION_MAX:
853 key=lambda name: self.servers[name].last_xmit())
854 del self.servers[oldest]
855 except InvalidRequest, e:
858 self.logerr("can't recognize JSON on input: %r" % line)
860 self.logerr("wildly malformed JSON blew the parser stack.")
862 class IrkerTCPHandler(SocketServer.StreamRequestHandler):
865 line = self.rfile.readline()
868 irker.handle(line.strip())
870 class IrkerUDPHandler(SocketServer.BaseRequestHandler):
872 data = self.request[0].strip()
873 #socket = self.request[1]
877 if __name__ == '__main__':
878 parser = argparse.ArgumentParser(
879 description=__doc__.strip().splitlines()[0])
881 '-d', '--log-level', metavar='LEVEL', choices=LOG_LEVELS,
882 help='file of trusted certificates for SSL/TLS')
884 '-l', '--log-file', metavar='PATH',
885 help='file for saving captured message traffic')
887 '-n', '--nick', metavar='NAME', default='irker%03d',
888 help="nickname (optionally with a '%%.*d' server connection marker)")
890 '-p', '--password', metavar='PASSWORD',
891 help='NickServ password')
893 '-i', '--immediate', action='store_const', const=True,
894 help='disconnect after sending each message')
896 '-V', '--version', action='version',
897 version='%(prog)s {0}'.format(version))
898 args = parser.parse_args()
900 handler = logging.StreamHandler()
901 LOG.addHandler(handler)
903 log_level = getattr(logging, args.log_level.upper())
904 LOG.setLevel(log_level)
907 logfile=args.log_file,
908 nick_template=args.nick,
909 nick_needs_number=re.search('%.*d', args.nick),
910 password=args.password,
912 LOG.info("irkerd version %s" % version)
914 irker.irc.add_event_handler("quit", lambda _c, _e: sys.exit(0))
915 irker.handle('{"to":"%s","privmsg":"%s"}' % (immediate, arguments[0]), quit_after=True)
918 irker.thread_launch()
920 tcpserver = SocketServer.TCPServer((HOST, PORT), IrkerTCPHandler)
921 udpserver = SocketServer.UDPServer((HOST, PORT), IrkerUDPHandler)
922 for server in [tcpserver, udpserver]:
923 server = threading.Thread(target=server.serve_forever)
924 server.setDaemon(True)
928 except KeyboardInterrupt:
930 except socket.error, e:
931 sys.stderr.write("irkerd: server launch failed: %r\n" % e)