Argthtjtr

I am newbie in Python. I tried to implement p2p network. My purpose is: create peers, connect peers, add new peers... which ensures the eventual consistency. I downloaded a P2P framework on http://cs.berry.edu/~nhamid/p2p/framework-python.html website and try to write the main method for it. However, when I compile the code, it failed to connect. Can anyone help me to fix it? Thanks adv

main.py

import threading

import btpeer



def test():

 print("Test received!")

#end def



class peer(btpeer.BTPeer):

 def __init__(self, maxpeers, serverport):

  btpeer.BTPeer.__init__(self, maxpeers, serverport)  

 #end def



serverport=5321

me=peer(5, serverport)

me.debug=1

me.handlers={"test":test}

name=raw_input("Enter your name: ")

me.setmyid(name)

print("Your peer is already created with host is "+str(me.serverhost))

option=raw_input("Press 1 to add new peer: ")

if option=='1':

  peer_name=raw_input("Enter name of new peer: ")

  peer_ip=raw_input("Enter the IP of new peer: ")

  peer_port=raw_input("Enter the port of new peer: ")

  me.addpeer(peer_name, peer_ip, peer_port)

  print("connecting to "+peer_name+"...")

  me.mainloop()

btpeer.py (that is the framework building P2P network I downloaded on internet)

# btpeer.py

import socket

import struct

import threading

import time

import traceback





def btdebug( msg ):

    """ Prints a messsage to the screen with the name of the current thread """

    print "[%s] %s" % ( str(threading.currentThread().getName()), msg )





#==============================================================================

class BTPeer:

    """ Implements the core functionality that might be used by a peer in a

    P2P network.

    """



    #--------------------------------------------------------------------------

    def __init__( self, maxpeers, serverport, myid=None, serverhost = None ):

    #--------------------------------------------------------------------------

    """ Initializes a peer servent (sic.) with the ability to catalog

    information for up to maxpeers number of peers (maxpeers may

    be set to 0 to allow unlimited number of peers), listening on

    a given server port , with a given canonical peer name (id)

    and host address. If not supplied, the host address

    (serverhost) will be determined by attempting to connect to an

    Internet host like Google.

    """

    self.debug = 0



    self.maxpeers = int(maxpeers)

    self.serverport = int(serverport)

    if serverhost: self.serverhost = serverhost

    else: self.__initserverhost()



    if myid: self.myid = myid

    else: self.myid = '%s:%d' % (self.serverhost, self.serverport)



    self.peerlock = threading.Lock()  # ensure proper access to

                                # peers list (maybe better to use

                                # threading.RLock (reentrant))

    self.peers = {}        # peerid ==> (host, port) mapping

    self.shutdown = False  # used to stop the main loop



    self.handlers = {}

    self.router = None







    #--------------------------------------------------------------------------

    def __initserverhost( self ):

    #--------------------------------------------------------------------------

    """ Attempt to connect to an Internet host in order to determine the

    local machine's IP address.

    """

    s = socket.socket( socket.AF_INET, socket.SOCK_STREAM )

    s.connect( ( "www.google.com", 80 ) )

    self.serverhost = s.getsockname()[0]

    s.close()







    #--------------------------------------------------------------------------

    def __debug( self, msg ):

    #--------------------------------------------------------------------------

    if self.debug:

        btdebug( msg )







    #--------------------------------------------------------------------------

    def __handlepeer( self, clientsock ):

    #--------------------------------------------------------------------------

    """

    handlepeer( new socket connection ) -> ()

    Dispatches messages from the socket connection

    """



    self.__debug( 'New child ' + str(threading.currentThread().getName()) )

    self.__debug( 'Connected ' + str(clientsock.getpeername()) )



    host, port = clientsock.getpeername()

    peerconn = BTPeerConnection( None, host, port, clientsock, debug=False )



    try:

        msgtype, msgdata = peerconn.recvdata()

        if msgtype: msgtype = msgtype.upper()

        if msgtype not in self.handlers:

        self.__debug( 'Not handled: %s: %s' % (msgtype, msgdata) )

        else:

        self.__debug( 'Handling peer msg: %s: %s' % (msgtype, msgdata) )

        self.handlers[ msgtype ]( peerconn, msgdata )

    except KeyboardInterrupt:

        raise

    except:

        if self.debug:

        traceback.print_exc()



    self.__debug( 'Disconnecting ' + str(clientsock.getpeername()) )

    peerconn.close()



    # end handlepeer method







    #--------------------------------------------------------------------------

    def __runstabilizer( self, stabilizer, delay ):

    #--------------------------------------------------------------------------

    while not self.shutdown:

        stabilizer()

        time.sleep( delay )







    #--------------------------------------------------------------------------

    def setmyid( self, myid ):

    #--------------------------------------------------------------------------

    self.myid = myid







    #--------------------------------------------------------------------------

    def startstabilizer( self, stabilizer, delay ):

    #--------------------------------------------------------------------------

    """ Registers and starts a stabilizer function with this peer. 

    The function will be activated every <delay> seconds. 

    """

    t = threading.Thread( target = self.__runstabilizer, 

                  args = [ stabilizer, delay ] )

    t.start()







    #--------------------------------------------------------------------------

    def addhandler( self, msgtype, handler ):

    #--------------------------------------------------------------------------

    """ Registers the handler for the given message type with this peer """

    assert len(msgtype) == 4

    self.handlers[ msgtype ] = handler







    #--------------------------------------------------------------------------

    def addrouter( self, router ):

    #--------------------------------------------------------------------------

    """ Registers a routing function with this peer. The setup of routing

    is as follows: This peer maintains a list of other known peers

    (in self.peers). The routing function should take the name of

    a peer (which may not necessarily be present in self.peers)

    and decide which of the known peers a message should be routed

    to next in order to (hopefully) reach the desired peer. The router

    function should return a tuple of three values: (next-peer-id, host,

    port). If the message cannot be routed, the next-peer-id should be

    None.

    """

    self.router = router







    #--------------------------------------------------------------------------

    def addpeer( self, peerid, host, port ):

    #--------------------------------------------------------------------------

    """ Adds a peer name and host:port mapping to the known list of peers.



    """

    if peerid not in self.peers and (self.maxpeers == 0 or

                     len(self.peers) < self.maxpeers):

        self.peers[ peerid ] = (host, int(port))

        return True

    else:

        return False







    #--------------------------------------------------------------------------

    def getpeer( self, peerid ):

    #--------------------------------------------------------------------------

    """ Returns the (host, port) tuple for the given peer name """

    assert peerid in self.peers    # maybe make this just a return NULL?

    return self.peers[ peerid ]







    #--------------------------------------------------------------------------

    def removepeer( self, peerid ):

    #--------------------------------------------------------------------------

    """ Removes peer information from the known list of peers. """

    if peerid in self.peers:

        del self.peers[ peerid ]







    #--------------------------------------------------------------------------

    def addpeerat( self, loc, peerid, host, port ):

    #--------------------------------------------------------------------------

    """ Inserts a peer's information at a specific position in the 

    list of peers. The functions addpeerat, getpeerat, and removepeerat

    should not be used concurrently with addpeer, getpeer, and/or 

    removepeer. 

    """

    self.peers[ loc ] = (peerid, host, int(port))







    #--------------------------------------------------------------------------

    def getpeerat( self, loc ):

    #--------------------------------------------------------------------------

    if loc not in self.peers:

        return None

    return self.peers[ loc ]







    #--------------------------------------------------------------------------

    def removepeerat( self, loc ):

    #--------------------------------------------------------------------------

    removepeer( self, loc ) 







    #--------------------------------------------------------------------------

    def getpeerids( self ):

    #--------------------------------------------------------------------------

    """ Return a list of all known peer id's. """

    return self.peers.keys()







    #--------------------------------------------------------------------------

    def numberofpeers( self ):

    #--------------------------------------------------------------------------

    """ Return the number of known peer's. """

    return len(self.peers)







    #--------------------------------------------------------------------------

    def maxpeersreached( self ):

    #--------------------------------------------------------------------------

    """ Returns whether the maximum limit of names has been added to the

    list of known peers. Always returns True if maxpeers is set to

    0.

    """

    assert self.maxpeers == 0 or len(self.peers) <= self.maxpeers

    return self.maxpeers > 0 and len(self.peers) == self.maxpeers







    #--------------------------------------------------------------------------

    def makeserversocket( self, port, backlog=5 ):

    #--------------------------------------------------------------------------

    """ Constructs and prepares a server socket listening on the given 

    port.

    """

    s = socket.socket( socket.AF_INET, socket.SOCK_STREAM )

    s.setsockopt( socket.SOL_SOCKET, socket.SO_REUSEADDR, 1 )

    s.bind( ( '', port ) )

    s.listen( backlog )

    return s







    #--------------------------------------------------------------------------

    def sendtopeer( self, peerid, msgtype, msgdata, waitreply=True ):

    #--------------------------------------------------------------------------

    """

    sendtopeer( peer id, message type, message data, wait for a reply )

     -> [ ( reply type, reply data ), ... ] 

    Send a message to the identified peer. In order to decide how to

    send the message, the router handler for this peer will be called.

    If no router function has been registered, it will not work. The

    router function should provide the next immediate peer to whom the 

    message should be forwarded. The peer's reply, if it is expected, 

    will be returned.

    Returns None if the message could not be routed.

    """



    if self.router:

        nextpid, host, port = self.router( peerid )

    if not self.router or not nextpid:

        self.__debug( 'Unable to route %s to %s' % (msgtype, peerid) )

        return None

    #host,port = self.peers[nextpid]

    return self.connectandsend( host, port, msgtype, msgdata,

                    pid=nextpid,

                    waitreply=waitreply )







    #--------------------------------------------------------------------------

    def connectandsend( self, host, port, msgtype, msgdata, 

            pid=None, waitreply=True ):

    #--------------------------------------------------------------------------

    """

    connectandsend( host, port, message type, message data, peer id,

    wait for a reply ) -> [ ( reply type, reply data ), ... ]

    Connects and sends a message to the specified host:port. The host's

    reply, if expected, will be returned as a list of tuples.

    """

    msgreply = 

    try:

        peerconn = BTPeerConnection( pid, host, port, debug=self.debug )

        peerconn.senddata( msgtype, msgdata )

        self.__debug( 'Sent %s: %s' % (pid, msgtype) )



        if waitreply:

        onereply = peerconn.recvdata()

        while (onereply != (None,None)):

            msgreply.append( onereply )

            self.__debug( 'Got reply %s: %s' 

                  % ( pid, str(msgreply) ) )

            onereply = peerconn.recvdata()

        peerconn.close()

    except KeyboardInterrupt:

        raise

    except:

        if self.debug:

        traceback.print_exc()



    return msgreply



    # end connectsend method







    #--------------------------------------------------------------------------

    def checklivepeers( self ):

    #--------------------------------------------------------------------------

    """ Attempts to ping all currently known peers in order to ensure that

    they are still active. Removes any from the peer list that do

    not reply. This function can be used as a simple stabilizer.

    """

    todelete = 

    for pid in self.peers:

        isconnected = False

        try:

        self.__debug( 'Check live %s' % pid )

        host,port = self.peers[pid]

        peerconn = BTPeerConnection( pid, host, port, debug=self.debug )

        peerconn.senddata( 'PING', '' )

        isconnected = True

        except:

        todelete.append( pid )

        if isconnected:

        peerconn.close()



    self.peerlock.acquire()

    try:

        for pid in todelete: 

        if pid in self.peers: del self.peers[pid]

    finally:

        self.peerlock.release()

    # end checklivepeers method







    #--------------------------------------------------------------------------

    def mainloop( self ):

    #--------------------------------------------------------------------------

    s = self.makeserversocket( self.serverport )

    s.settimeout(2)

    self.__debug( 'Server started: %s (%s:%d)'

              % ( self.myid, self.serverhost, self.serverport ) )



    while not self.shutdown:

        try:

        self.__debug( 'Listening for connections...' )

        clientsock, clientaddr = s.accept()

        clientsock.settimeout(None)



        t = threading.Thread( target = self.__handlepeer,

                      args = [ clientsock ] )

        t.start()

        except KeyboardInterrupt:

        print 'KeyboardInterrupt: stopping mainloop'

        self.shutdown = True

        continue

        except:

        if self.debug:

            traceback.print_exc()

            continue



    # end while loop

    self.__debug( 'Main loop exiting' )



    s.close()



    # end mainloop method



# end BTPeer class









# **********************************************************









class BTPeerConnection:



    #--------------------------------------------------------------------------

    def __init__( self, peerid, host, port, sock=None, debug=False ):

    #--------------------------------------------------------------------------

    # any exceptions thrown upwards



    self.id = peerid

    self.debug = debug



    if not sock:

        self.s = socket.socket( socket.AF_INET, socket.SOCK_STREAM )

        self.s.connect( ( host, int(port) ) )

    else:

        self.s = sock



    self.sd = self.s.makefile( 'rw', 0 )





    #--------------------------------------------------------------------------

    def __makemsg( self, msgtype, msgdata ):

    #--------------------------------------------------------------------------

    msglen = len(msgdata)

    msg = struct.pack( "!4sL%ds" % msglen, msgtype, msglen, msgdata )

    return msg





    #--------------------------------------------------------------------------

    def __debug( self, msg ):

    #--------------------------------------------------------------------------

    if self.debug:

        btdebug( msg )





    #--------------------------------------------------------------------------

    def senddata( self, msgtype, msgdata ):

    #--------------------------------------------------------------------------

    """

    senddata( message type, message data ) -> boolean status

    Send a message through a peer connection. Returns True on success

    or False if there was an error.

    """



    try:

        msg = self.__makemsg( msgtype, msgdata )

        self.sd.write( msg )

        self.sd.flush()

    except KeyboardInterrupt:

        raise

    except:

        if self.debug:

        traceback.print_exc()

        return False

    return True





    #--------------------------------------------------------------------------

    def recvdata( self ):

    #--------------------------------------------------------------------------

    """

    recvdata() -> (msgtype, msgdata)

    Receive a message from a peer connection. Returns (None, None)

    if there was any error.

    """



    try:

        msgtype = self.sd.read( 4 )

        if not msgtype: return (None, None)



            lenstr = self.sd.read( 4 )

        msglen = int(struct.unpack( "!L", lenstr )[0])

        msg = ""



        while len(msg) != msglen:

        data = self.sd.read( min(2048, msglen - len(msg)) )

        if not len(data):

            break

        msg += data



        if len(msg) != msglen:

        return (None, None)



    except KeyboardInterrupt:

        raise

    except:

        if self.debug:

        traceback.print_exc()

        return (None, None)



    return ( msgtype, msg )



    # end recvdata method





    #--------------------------------------------------------------------------

    def close( self ):

    #--------------------------------------------------------------------------

    """

    close()

    Close the peer connection. The send and recv methods will not work

    after this call.

    """



    self.s.close()

    self.s = None

    self.sd = None





    #--------------------------------------------------------------------------

    def __str__( self ):

    #--------------------------------------------------------------------------

    return "|%s|" % peerid

This is my error

[MainThread] Listening for connections...

Traceback (most recent call last):

  File "/home/vytran6/Downloads/test/btpeer.py", line 387, in mainloop

    clientsock, clientaddr = s.accept()

  File "/usr/lib/python2.7/socket.py", line 206, in accept

    sock, addr = self._sock.accept()

timeout: timed out

[MainThread] Listening for connections...

Traceback (most recent call last):

  File "/home/vytran6/Downloads/test/btpeer.py", line 387, in mainloop

    clientsock, clientaddr = s.accept()

  File "/usr/lib/python2.7/socket.py", line 206, in accept

    sock, addr = self._sock.accept()

timeout: timed out

[MainThread] Listening for connections...

^CKeyboardInterrupt: stopping mainloop

[MainThread] Main loop exiting