udp discovery node crawler

# after entering the console of pyethapp
# https://github.com/ethereum/pyethapp/wiki/The_Console

from devp2p import kademlia
import gevent

def crawl():
    delay = 0.1
    lookups = 0
    kademlia_proto = eth.app.services.discovery.protocol.kademlia
    while True:
        if lookups % 10 == 0:
            print('crawler', len(kademlia_proto.routing), lookups)
        nodeid = kademlia.random_nodeid()
        kademlia_proto.find_node(nodeid)
        gevent.sleep(delay)
        lookups += 1
            
gevent.spawn(crawl)