mirror of
https://github.com/alexgo-io/stacks-puppet-node.git
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163 lines
4.5 KiB
Python
163 lines
4.5 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Blockstack
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~~~~~
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copyright: (c) 2014-2015 by Halfmoon Labs, Inc.
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copyright: (c) 2016 by Blockstack.org
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This file is part of Blockstack
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Blockstack is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Blockstack is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Blockstack. If not, see <http://www.gnu.org/licenses/>.
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"""
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import time
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from itertools import izip
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from itertools import imap
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from itertools import takewhile
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import operator
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from collections import OrderedDict
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from zope.interface import implements
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from zope.interface import Interface
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from kademlia.storage import IStorage
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from kademlia.log import Logger
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from kademlia.utils import digest
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import sys
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import json
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import pybitcoin
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import os
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import socket
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# Hack around absolute paths
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# current_dir = os.path.abspath(os.path.dirname(__file__))
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# parent_dir = os.path.abspath(current_dir + "/../")
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# sys.path.insert(0, parent_dir)
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# from .plugin import STORAGE_TTL
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# 3 years
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STORAGE_TTL = 3 * 60 * 60 * 24 * 365
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DHT_SERVER_PORT = 6265 # blockstackd default to port 6264
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DEFAULT_DHT_SERVERS = [('dht.openname.org', DHT_SERVER_PORT),
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('dht.onename.com', DHT_SERVER_PORT),
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('dht.halfmoonlabs.com', DHT_SERVER_PORT),
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('127.0.0.1', DHT_SERVER_PORT)]
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class BlockStorage(object):
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implements(IStorage)
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""" BlockStorage has following properties:
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a) is content-addressable (all keys must be hash(value))
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b) high TTL (effectively the keys don't expire)
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c) stores only valid JSON values
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"""
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def __init__(self, ttl=STORAGE_TTL):
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"""
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By default, max age is three years.
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"""
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self.data = OrderedDict()
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self.ttl = ttl
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self.log = Logger(system=self)
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def __setitem__(self, key, value):
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try:
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test_value = json.loads(value)
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except:
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self.log.info("value not JSON, not storing")
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return
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hash = pybitcoin.hash.hex_hash160(value)
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test_key = digest(hash)
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if key != test_key:
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self.log.info("hash(value) doesn't match, not storing")
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return
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if key in self.data:
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del self.data[key]
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self.data[key] = (time.time(), value)
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self.cull()
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def cull(self):
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for k, v in self.iteritemsOlderThan(self.ttl):
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self.data.popitem(first=True)
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def get(self, key, default=None):
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self.cull()
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if key in self.data:
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value = self[key]
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hash = pybitcoin.hash.hex_hash160(value)
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test_key = digest(hash)
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if key != test_key:
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self.log.info("hash(value) doesn't match, ignoring value")
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return default
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return self[key]
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return default
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def __getitem__(self, key):
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self.cull()
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return self.data[key][1]
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def __iter__(self):
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self.cull()
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return iter(self.data)
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def __repr__(self):
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self.cull()
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return repr(self.data)
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def iteritemsOlderThan(self, secondsOld):
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minBirthday = time.time() - secondsOld
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zipped = self._tripleIterable()
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matches = takewhile(lambda r: minBirthday >= r[1], zipped)
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return imap(operator.itemgetter(0, 2), matches)
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def _tripleIterable(self):
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ikeys = self.data.iterkeys()
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ibirthday = imap(operator.itemgetter(0), self.data.itervalues())
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ivalues = imap(operator.itemgetter(1), self.data.itervalues())
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return izip(ikeys, ibirthday, ivalues)
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def iteritems(self):
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self.cull()
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ikeys = self.data.iterkeys()
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ivalues = imap(operator.itemgetter(1), self.data.itervalues())
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return izip(ikeys, ivalues)
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# ---------------------------------
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def hostname_to_ip(servers):
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""" Given (hostname, port) return (ip_address, port)
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"""
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reply = []
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for server, port in servers:
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ip_address = socket.gethostbyname(server)
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reply.append((ip_address, port))
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return reply
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