def bootstrap(self, timeout=5, interval=30):
'''A generator to perform bootstrap function.'''
candidates = self.candidates[:] # a copy of list of candidates
while True:
if _debug: print self.net.name, 'bootstrap server=', self.server, 'neighbors=', len(self.neighbors), 'candidates=', len(candidates)
if not self.server and not self.neighbors and candidates: # more candidates but no more neighbors
node = candidates.pop(0)
if _debug: print 'bootstrap trying node=', repr(node)
if node.type==socket.SOCK_DGRAM and isMulticast(node.ip):
yield self.net.send(Message(name='Discover:Request'), node=node)
msg = yield self.net.get(lambda x: x.name=='Discover:Response' and x.multicast, timeout=timeout)
else:
if not isIPv4(node.ip): # is a IP address?
node = Node(ip=socket.gethostbyname(node.ip), port=node.port, type=node.type, guid=node.guid)
yield self.net.send(Message(name='Discover:Request'), node=node)
msg = yield self.net.get(lambda x: x.name=='Discover:Response' and not x.multicast, timeout=timeout)
if msg:
added = False
for node in msg.neighbors:
if node.hostport == msg.remote.hostport: # whether msg.remote exists in msg.neighbors, which means remote is a server and we are already connected.
if _debug: print 'received neighbor', repr(node)
self.neighbors.insert(0, node) # put this as most preferred neighbor.
added = True
else:
if _debug: print 'received candidate', repr(node)
candidates.append(node) # put this as the next candidate
if added:
yield self.net.put(Message(name='Discover:Indication', node=self.node, neighbors=self.neighbors)) # indicate change in client.
else:
if _debug: print 'bootstrap did not receive response.'
elif not self.server and self.neighbors: # perform neighbor refresh
yield dht.randomsleep(timeout)
result = yield self.net.send(Message(name='Ping:Request'), node=self.neighbors[0], timeout=timeout)
if not result: # no response received, remove the neighbor
del self.neighbors[0]
yield self.net.put(Message(name='Discover:Indication', node=self.node, neighbors=self.neighbors)) # indicate change in client.
elif not self.server and not self.neighbors and not candidates:
candidates = self.candidates[:]
yield dht.randomsleep(timeout)
else: # just wait before trying again.
yield dht.randomsleep(interval)
def promotionhandler(self, timeout=10): # TODO: change to 10 min (600) for production use.
'''Promote the node to super node after some uptime.'''
yield dht.randomsleep(timeout) # wait for some uptime
if _debug: print 'promotionhandler invoked'
if self.client and self.client.neighbors:
if self.router is None: self.router = dht.Router(self.net).start()
if self.storage is None: self.storage = dht.Storage(self.net, self.router).start()
if not self.router.initialized:
self.router.bs = self.client.neighbors;
if _debug: print 'joining the dht'
joined = yield self.router.join(self.router.bs[0])
if joined:
self.client.server = True
def mcastreceiver(self, maxsize=1500, timeout=None, interval=30):
while True:
if self.mcast is not None:
data, addr = yield multitask.recvfrom(self.mcast, maxsize, timeout=timeout)
msg, remote = self.parse(data, addr, self.mcast.type)
if not msg: print 'ignoring empty msg'; continue # ignore invalid message. TODO: handle non-p2p message
if remote == self.node:
if _debug: print 'ignoring our own multicast packet'
continue
if _debug: print self.name, 'mcast-received %s=>%s: %r'%(remote.hostport, self.nodemcast.hostport, msg)
if 'ack' in msg: del msg['ack'] # just remove ack, but don't send an ack for multicast
msg['remote'] = remote
msg['multicast'] = True # so that application knows that this is received on multicast
yield self.put(msg)
else:
yield dht.randomsleep(interval)
def promotionhandler(
self,
timeout=10): # TODO: change to 10 min (600) for production use.
'''Promote the node to super node after some uptime.'''
yield dht.randomsleep(timeout) # wait for some uptime
if _debug: print 'promotionhandler invoked'
if self.client and self.client.neighbors:
if self.router is None: self.router = dht.Router(self.net).start()
if self.storage is None:
self.storage = dht.Storage(self.net, self.router).start()
if not self.router.initialized:
self.router.bs = self.client.neighbors
if _debug: print 'joining the dht'
joined = yield self.router.join(self.router.bs[0])
if joined:
self.client.server = True
def mcastreceiver(self, maxsize=1500, timeout=None, interval=30):
while True:
if self.mcast is not None:
data, addr = yield multitask.recvfrom(self.mcast,
maxsize,
timeout=timeout)
msg, remote = self.parse(data, addr, self.mcast.type)
if not msg:
print 'ignoring empty msg'
continue # ignore invalid message. TODO: handle non-p2p message
if remote == self.node:
if _debug: print 'ignoring our own multicast packet'
continue
if _debug:
print self.name, 'mcast-received %s=>%s: %r' % (
remote.hostport, self.nodemcast.hostport, msg)
if 'ack' in msg:
del msg[
'ack'] # just remove ack, but don't send an ack for multicast
msg['remote'] = remote
msg['multicast'] = True # so that application knows that this is received on multicast
yield self.put(msg)
else:
yield dht.randomsleep(interval)
def bootstrap(self, timeout=5, interval=30):
'''A generator to perform bootstrap function.'''
candidates = self.candidates[:] # a copy of list of candidates
while True:
if _debug:
print self.net.name, 'bootstrap server=', self.server, 'neighbors=', len(
self.neighbors), 'candidates=', len(candidates)
if not self.server and not self.neighbors and candidates: # more candidates but no more neighbors
node = candidates.pop(0)
if _debug: print 'bootstrap trying node=', repr(node)
if node.type == socket.SOCK_DGRAM and isMulticast(node.ip):
yield self.net.send(Message(name='Discover:Request'),
node=node)
msg = yield self.net.get(
lambda x: x.name == 'Discover:Response' and x.
multicast,
timeout=timeout)
else:
if not isIPv4(node.ip): # is a IP address?
node = Node(ip=socket.gethostbyname(node.ip),
port=node.port,
type=node.type,
guid=node.guid)
yield self.net.send(Message(name='Discover:Request'),
node=node)
msg = yield self.net.get(
lambda x: x.name == 'Discover:Response' and not x.
multicast,
timeout=timeout)
if msg:
added = False
for node in msg.neighbors:
if node.hostport == msg.remote.hostport: # whether msg.remote exists in msg.neighbors, which means remote is a server and we are already connected.
if _debug: print 'received neighbor', repr(node)
self.neighbors.insert(
0,
node) # put this as most preferred neighbor.
added = True
else:
if _debug: print 'received candidate', repr(node)
candidates.append(
node) # put this as the next candidate
if added:
yield self.net.put(
Message(name='Discover:Indication',
node=self.node,
neighbors=self.neighbors)
) # indicate change in client.
else:
if _debug: print 'bootstrap did not receive response.'
elif not self.server and self.neighbors: # perform neighbor refresh
yield dht.randomsleep(timeout)
result = yield self.net.send(Message(name='Ping:Request'),
node=self.neighbors[0],
timeout=timeout)
if not result: # no response received, remove the neighbor
del self.neighbors[0]
yield self.net.put(
Message(name='Discover:Indication',
node=self.node,
neighbors=self.neighbors)
) # indicate change in client.
elif not self.server and not self.neighbors and not candidates:
candidates = self.candidates[:]
yield dht.randomsleep(timeout)
else: # just wait before trying again.
yield dht.randomsleep(interval)
