Comrad/app/etc/first_node.py

import logging
import asyncio

from kademlia.network import Server
from kademlia.storage import *
import shelve
from collections import OrderedDict
import pickle,os

class HalfForgetfulStorage(ForgetfulStorage):
    def __init__(self, ttl=604800):
        """
        By default, max age is a week.
        """
        self.fn='sto.dat'
        if not os.path.exists(self.fn):
            self.data={}
        else:
            with open(self.fn,'rb') as f:
                self.data=pickle.load(f)


        print('loaded:',self.data)

        #self.data = pickle.open('sto.dat','rb') #,writeback=True)
        # self.data = self.store.get('OrderedDict',OrderedDict())
        self.ttl = ttl

    def __setitem__(self, key, value):
        self.data[key] = (time.monotonic(), value)
        self.write()

    def write(self):
        with open(self.fn,'wb') as f:
            pickle.dump(self.data, f, protocol=pickle.HIGHEST_PROTOCOL)

    def get(self, key, default=None):
        # self.cull()
        if key in self.data:
            print('????',self.data[key])
            return self[key]
        return default

    def __getitem__(self, key):
        return self.data[key][1]

    def __repr__(self):
        return repr(self.data)

    def iter_older_than(self, seconds_old):
        min_birthday = time.monotonic() - seconds_old
        zipped = self._triple_iter()
        matches = takewhile(lambda r: min_birthday >= r[1], zipped)
        return list(map(operator.itemgetter(0, 2), matches))

    def _triple_iter(self):
        ikeys = self.data.keys()
        ibirthday = map(operator.itemgetter(0), self.data.values())
        ivalues = map(operator.itemgetter(1), self.data.values())
        return zip(ikeys, ibirthday, ivalues)

    def __iter__(self):
        ikeys = self.data.keys()
        ivalues = map(operator.itemgetter(1), self.data.values())
        return zip(ikeys, ivalues)


# handler = logging.StreamHandler()
# formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
# handler.setFormatter(formatter)
# log = logging.getLogger('kademlia')
# log.addHandler(handler)
# log.setLevel(logging.DEBUG)


loop = asyncio.get_event_loop()
loop.set_debug(True)


shelf = HalfForgetfulStorage()

server = Server(storage=shelf)
loop.run_until_complete(server.listen(8468))

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    server.stop()
    loop.close()