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core/irc.py

@@ -0,0 +1,108 @@
+import sys
+import re
+import socket
+import thread
+import asyncore
+import asynchat
+import Queue
+
+
+def decode(txt):
+    for codec in ('utf-8', 'iso-8859-1', 'shift_jis', 'cp1252'):
+        try:
+            return txt.decode(codec)
+        except UnicodeDecodeError:
+            continue
+    return txt.decode('utf-8', 'ignore')
+
+
+class crlf_tcp(asynchat.async_chat):
+    "Handles tcp connections that consist of utf-8 lines ending with crlf"
+
+    def __init__(self, host, port):
+        asynchat.async_chat.__init__(self)
+        self.set_terminator('\r\n')
+        self.buffer = ""
+        self.obuffer = ""
+        self.oqueue = Queue.Queue() #where we stick things that need to be sent
+        self.iqueue = Queue.Queue() #where we stick things that were received
+        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.socket.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 0)
+        self.host = host
+        self.port = port
+
+    def run(self):
+        self.connect((self.host, self.port))
+        asyncore.loop()
+
+    def handle_connect(self):
+        thread.start_new_thread(self.queue_read_loop, ())
+
+    def queue_read_loop(self):
+        while True:
+            line = self.oqueue.get().splitlines()[0][:500]
+            print ">>> %r" % line
+            self.push(line.encode('utf-8', 'replace') + '\r\n')
+
+    def collect_incoming_data(self, data):
+        self.buffer += data
+
+    def found_terminator(self):
+        line = self.buffer
+        self.iqueue.put(decode(line))
+        self.buffer = ''
+
+irc_prefix_rem = re.compile(r'(.*?) (.*?) (.*)').match
+irc_noprefix_rem = re.compile(r'()(.*?) (.*)').match
+irc_netmask_rem = re.compile(r':?([^!@]*)!?([^@]*)@?(.*)').match
+irc_param_ref = re.compile(r'(?:^|(?<= ))(:.*|[^ ]+)').findall
+
+
+class irc(object):
+    "handles the IRC protocol"
+    #see the docs/ folder for more information on the protocol
+
+    def __init__(self, network, nick, port=6667):
+        self.conn = crlf_tcp(network, port)
+        thread.start_new_thread(self.conn.run, ())
+        self.out = Queue.Queue() #responses from the server are placed here
+        # format: [rawline, prefix, command, params,
+        # nick, user, host, paramlist, msg]
+        self.nick(nick)
+        self.cmd("USER", ["skybot v0.01", "0", "bot"])
+        thread.start_new_thread(self.parse_loop, ())
+
+    def parse_loop(self):
+        while True:
+            msg = self.conn.iqueue.get()
+            if msg.startswith(":"): #has a prefix
+                prefix, command, params = irc_prefix_rem(msg).groups()
+            else:
+                prefix, command, params = irc_noprefix_rem(msg).groups()
+            nick, user, host = irc_netmask_rem(prefix).groups()
+            paramlist = irc_param_ref(params)
+            lastparam = ""
+            if paramlist and paramlist[-1].startswith(':'):
+                    lastparam = paramlist[-1][1:]
+            self.out.put([msg, prefix, command, params, nick, user, host,
+                    paramlist, lastparam])
+            if command == "PING":
+                self.cmd("PONG", [params])
+
+    def nick(self, nick):
+        self.cmd("NICK", [nick])
+
+    def join(self, channel):
+        self.cmd("JOIN", [":"+channel])
+
+    def msg(self, target, text):
+        self.cmd("PRIVMSG", [target, ":"+text])
+
+    def cmd(self, command, params=None):
+        if params:
+            self.send(command+' '+' '.join(params))
+        else:
+            self.send(command)
+
+    def send(self, str):
+        self.conn.oqueue.put(str)