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.getPeers():
isconnected = False
try:
host,port,super = self.getPeers()[pid]
peerConn = PeerConnection( pid, host, port)
peerConn.sendData( 'PING', '' )
isconnected = True
except:
todelete.append( pid )
if isconnected:
peerConn.close()
self.getPeerLock().acquire()
try:
for pid in todelete:
if pid in self.getPeers():
del self.getPeers()[pid]
finally:
self.getPeerLock().release()
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 = PeerConnection( pid, host, port )
peerconn.sendData( msgtype, msgdata )
if waitreply:
onereply = peerconn.recvData()
while (onereply != (None,None)):
msgreply.append( onereply )
print ( 'Got reply %s: %s'
% ( pid, str(msgreply) ) )
onereply = peerconn.recvData()
peerconn.close()
except KeyboardInterrupt:
raise
except:
if False:
traceback.print_exc()
return msgreply
def connectAndSend( self, host, port, msgType, msgData,
pid=None, waitreply=True ):
msgreply = []
num = self.getAttemptedConnectionNumber()
while num != Peer.NUMBER:
print "ConnectAndSend peers from (%s,%s) %s number %d" % (host,port,msgType,num)
try:
peerConn = PeerConnection( pid, host, port)
peerConn.sendData( msgType, msgData )
if waitreply:
onereply = peerConn.recvData()
while (onereply != (None,None)):
msgreply.append( onereply )
print 'Got reply %s: %s' % ( pid, str(msgreply) )
onereply = peerConn.recvData()
peerConn.close()
break
except KeyboardInterrupt:
raise
except:
num += 1
print "Erro de Connecao peers from (%s,%s) %s %d" % (host,port,msgType, num)
if num == Peer.NUMBER:
self.setMySuperPeer(self.getMyID())
self.setPeerType(Peer.SUPER)
return msgreply
