1 files changed, 82 insertions, 0 deletions
diff --git a/cholerab/cholerab-live/chol_net.py b/cholerab/cholerab-live/chol_net.py
new file mode 100644
index 00000000..ee0f5378
--- /dev/null
+++ b/cholerab/cholerab-live/chol_net.py
@@ -0,0 +1,82 @@
+from socket import socket, AF_INET,SOCK_DGRAM,IPPROTO_UDP,SOL_SOCKET,SO_REUSEADDR,IP_MULTICAST_TTL,IP_MULTICAST_LOOP,INADDR_ANY,inet_aton,IP_ADD_MEMBERSHIP,IPPROTO_IP
+import struct
+import threading 
+import logging
+log = None
+from select import select
+GROUP = '224.110.42.23'
+PORT  = 42023
+log = logging.getLogger('CholerabNet')
+class CholerabMulicastNet(threading.Thread):
+  def __init__(self,cholerab,group=GROUP,port=PORT):
+    threading.Thread.__init__(self)
+    self.cholerab=cholerab
+    self.group=group
+    self.port=port
+    self.initSocket()
+  def send_char(self,x,y,char):
+    """ translates given params into network message """
+    self.send_mc("%s %d %d" %(str(ord(char)),x,y))
+  def send_mc(self,arg):
+    """ Sends message via multicast"""
+    try:
+      log.debug("Sending '%s' to %s:%d" % (arg,self.group,self.port)) 
+      self.ignore_next += 1# we need this to work together correctly with reused sockets
+      self.s.sendto("%s" % arg,0,(self.group,self.port))
+    except Exception ,e:
+      self.ignore_next -=1
+      log.error("IN send_mc:%s"%str(e))
+
+  def initSocket (self,rcv=1):
+    ''' Initializes a Multicast socket '''
+    host = ''
+    log.debug("Setting up Multicast Socket")
+    self.s = socket(AF_INET,SOCK_DGRAM, IPPROTO_UDP)
+    self.s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
+    self.s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, 32)
+    self.s.setsockopt(IPPROTO_IP,IP_MULTICAST_LOOP,1) # we do not want our own packets to be replayed 
+    if rcv==1:
+      log.debug("Configuring for Read AND Write")
+      self.s.bind((host,PORT))
+      mreq = struct.pack("4sl", inet_aton(GROUP), INADDR_ANY)
+      self.s.setsockopt(IPPROTO_IP,IP_ADD_MEMBERSHIP,mreq)
+  def run(self):
+    self.running = 1
+    self.ignore_next = 0
+    while self.running:
+      # break if we do not want to loop on
+      ready,output,exception = select([self.s],[],[],1) # try every second
+      for r in ready:
+        if r == self.s:
+          log.debug(str(self.ignore_next))
+          (data,addr) = self.s.recvfrom(1024)
+          if not self.ignore_next:
+            log.debug("Received Data from %s, data %s"%(str(addr),str(data)))
+            self.receive_net(addr,data)
+          else:
+            self.ignore_next -= 1 
+
+  def send_stupid(self,addr):
+    """ sends YOU ARE MADE OF STUPID to the right host """
+    #TODO implement me
+    pass
+
+  def receive_net(self,addr,data):
+    """ resolves which nick sent the message
+    TODO handle user resolution in mulicast """
+    try: 
+      address,port = addr
+      arr = str(data).split()
+      char = arr[0]
+      x = arr[1]
+      y = arr[2]
+      self.cholerab.write_char(int(x),int(y),chr(int(char)))
+    except Exception, e:
+      log.error("Triggered YOU ARE MADE OF STUPID: %s" % str(e))
+      self.send_stupid(addr)
+
+  def stop(self):
+    '''
+    stops the whole treading stuff gracefully
+    '''
+    self.running=0