+import os, sha, random
+
+from twisted.internet import defer, reactor
+from twisted.internet.abstract import isIPAddress
+from twisted.trial import unittest
from zope.interface import implements
from apt_dht.interfaces import IDHT
+from khashmir import Khashmir
+
+class DHTError(Exception):
+ """Represents errors that occur in the DHT."""
class DHT:
implements(IDHT)
def __init__(self):
- pass
\ No newline at end of file
+ self.config = None
+ self.cache_dir = ''
+ self.bootstrap = []
+ self.bootstrap_node = False
+ self.joining = None
+ self.joined = False
+ self.storing = {}
+ self.retrieving = {}
+ self.retrieved = {}
+
+ def loadConfig(self, config, section):
+ """See L{apt_dht.interfaces.IDHT}."""
+ self.config_parser = config
+ self.section = section
+ self.config = {}
+ self.cache_dir = self.config_parser.get('DEFAULT', 'cache_dir')
+ self.bootstrap = self.config_parser.getstringlist(section, 'BOOTSTRAP')
+ self.bootstrap_node = self.config_parser.getboolean(section, 'BOOTSTRAP_NODE')
+ for k in self.config_parser.options(section):
+ if k in ['K', 'HASH_LENGTH', 'CONCURRENT_REQS', 'STORE_REDUNDANCY',
+ 'MAX_FAILURES', 'PORT']:
+ self.config[k] = self.config_parser.getint(section, k)
+ elif k in ['CHECKPOINT_INTERVAL', 'MIN_PING_INTERVAL',
+ 'BUCKET_STALENESS', 'KEINITIAL_DELAY', 'KE_DELAY', 'KE_AGE']:
+ self.config[k] = self.config_parser.gettime(section, k)
+ else:
+ self.config[k] = self.config_parser.get(section, k)
+ if 'PORT' not in self.config:
+ self.config['PORT'] = self.config_parser.getint('DEFAULT', 'PORT')
+
+ def join(self):
+ """See L{apt_dht.interfaces.IDHT}."""
+ if self.config is None:
+ raise DHTError, "configuration not loaded"
+ if self.joining:
+ raise DHTError, "a join is already in progress"
+
+ self.khashmir = Khashmir(self.config, self.cache_dir)
+
+ self.joining = defer.Deferred()
+ for node in self.bootstrap:
+ host, port = node.rsplit(':', 1)
+ port = int(port)
+ if isIPAddress(host):
+ self._join_gotIP(host, port)
+ else:
+ reactor.resolve(host).addCallback(self._join_gotIP, port)
+
+ return self.joining
+
+ def _join_gotIP(self, ip, port):
+ """Called after an IP address has been found for a single bootstrap node."""
+ self.khashmir.addContact(ip, port, self._join_single)
+
+ def _join_single(self):
+ """Called when a single bootstrap node has been added."""
+ self.khashmir.findCloseNodes(self._join_complete)
+
+ def _join_complete(self, result):
+ """Called when the tables have been initialized with nodes."""
+ if not self.joined:
+ self.joined = True
+ if len(result) > 0 or self.bootstrap_node:
+ df = self.joining
+ self.joining = None
+ df.callback(result)
+ else:
+ df = self.joining
+ self.joining = None
+ df.errback(DHTError('could not find any nodes to bootstrap to'))
+
+ def leave(self):
+ """See L{apt_dht.interfaces.IDHT}."""
+ if self.config is None:
+ raise DHTError, "configuration not loaded"
+
+ if self.joined or self.joining:
+ if self.joining:
+ self.joining.errback(DHTError('still joining when leave was called'))
+ self.joining = None
+ self.joined = False
+ self.khashmir.shutdown()
+
+ def normalizeKey(self, key):
+ """Normalize a key's length suitable for insertion in the DHT."""
+ key_bytes = (self.config['HASH_LENGTH'] - 1) // 8 + 1
+ if len(key) < key_bytes:
+ key = key + '\000'*(key_bytes - len(key))
+ elif len(key) > key_bytes:
+ key = key[:key_bytes]
+ return key
+
+ def getValue(self, key):
+ """See L{apt_dht.interfaces.IDHT}."""
+ if self.config is None:
+ raise DHTError, "configuration not loaded"
+ if not self.joined:
+ raise DHTError, "have not joined a network yet"
+
+ d = defer.Deferred()
+ key = self.normalizeKey(key)
+ if key not in self.retrieving:
+ self.khashmir.valueForKey(key, self._getValue)
+ self.retrieving.setdefault(key, []).append(d)
+ return d
+
+ def _getValue(self, key, result):
+ if result:
+ self.retrieved.setdefault(key, []).extend(result)
+ else:
+ final_result = []
+ if key in self.retrieved:
+ final_result = self.retrieved[key]
+ del self.retrieved[key]
+ for i in range(len(self.retrieving[key])):
+ d = self.retrieving[key].pop(0)
+ d.callback(final_result)
+ del self.retrieving[key]
+
+ def storeValue(self, key, value):
+ """See L{apt_dht.interfaces.IDHT}."""
+ if self.config is None:
+ raise DHTError, "configuration not loaded"
+ if not self.joined:
+ raise DHTError, "have not joined a network yet"
+
+ key = self.normalizeKey(key)
+ if key in self.storing and value in self.storing[key]:
+ raise DHTError, "already storing that key with the same value"
+
+ d = defer.Deferred()
+ self.khashmir.storeValueForKey(key, value, self._storeValue)
+ self.storing.setdefault(key, {})[value] = d
+ return d
+
+ def _storeValue(self, key, value, result):
+ if key in self.storing and value in self.storing[key]:
+ if len(result) > 0:
+ self.storing[key][value].callback(result)
+ else:
+ self.storing[key][value].errback(DHTError('could not store value %s in key %s' % (value, key)))
+ del self.storing[key][value]
+ if len(self.storing[key].keys()) == 0:
+ del self.storing[key]
+
+class TestSimpleDHT(unittest.TestCase):
+ """Unit tests for the DHT."""
+
+ timeout = 2
+ DHT_DEFAULTS = {'PORT': 9977, 'K': 8, 'HASH_LENGTH': 160,
+ 'CHECKPOINT_INTERVAL': 900, 'CONCURRENT_REQS': 4,
+ 'STORE_REDUNDANCY': 3, 'MAX_FAILURES': 3,
+ 'MIN_PING_INTERVAL': 900,'BUCKET_STALENESS': 3600,
+ 'KEINITIAL_DELAY': 15, 'KE_DELAY': 1200,
+ 'KE_AGE': 3600, }
+
+ def setUp(self):
+ self.a = DHT()
+ self.b = DHT()
+ self.a.config = self.DHT_DEFAULTS.copy()
+ self.a.config['PORT'] = 4044
+ self.a.bootstrap = ["127.0.0.1:4044"]
+ self.a.bootstrap_node = True
+ self.a.cache_dir = '/tmp'
+ self.b.config = self.DHT_DEFAULTS.copy()
+ self.b.config['PORT'] = 4045
+ self.b.bootstrap = ["127.0.0.1:4044"]
+ self.b.cache_dir = '/tmp'
+
+ def test_normalizeKey(self):
+ self.failUnless(self.a.normalizeKey('12345678901234567890') == '12345678901234567890')
+ self.failUnless(self.a.normalizeKey('12345678901234567') == '12345678901234567\000\000\000')
+ self.failUnless(self.a.normalizeKey('1234567890123456789012345') == '12345678901234567890')
+ self.failUnless(self.a.normalizeKey('1234567890123456789') == '1234567890123456789\000')
+ self.failUnless(self.a.normalizeKey('123456789012345678901') == '12345678901234567890')
+
+ def test_bootstrap_join(self):
+ d = self.a.join()
+ return d
+
+ def node_join(self, result):
+ d = self.b.join()
+ return d
+
+ def test_join(self):
+ self.lastDefer = defer.Deferred()
+ d = self.a.join()
+ d.addCallback(self.node_join)
+ d.addCallback(self.lastDefer.callback)
+ return self.lastDefer
+
+ def value_stored(self, result, value):
+ self.stored -= 1
+ if self.stored == 0:
+ self.get_values()
+
+ def store_values(self, result):
+ self.stored = 3
+ d = self.a.storeValue(sha.new('4045').digest(), str(4045*3))
+ d.addCallback(self.value_stored, 4045)
+ d = self.a.storeValue(sha.new('4044').digest(), str(4044*2))
+ d.addCallback(self.value_stored, 4044)
+ d = self.b.storeValue(sha.new('4045').digest(), str(4045*2))
+ d.addCallback(self.value_stored, 4045)
+
+ def check_values(self, result, values):
+ self.checked -= 1
+ self.failUnless(len(result) == len(values))
+ for v in result:
+ self.failUnless(v in values)
+ if self.checked == 0:
+ self.lastDefer.callback(1)
+
+ def get_values(self):
+ self.checked = 4
+ d = self.a.getValue(sha.new('4044').digest())
+ d.addCallback(self.check_values, [str(4044*2)])
+ d = self.b.getValue(sha.new('4044').digest())
+ d.addCallback(self.check_values, [str(4044*2)])
+ d = self.a.getValue(sha.new('4045').digest())
+ d.addCallback(self.check_values, [str(4045*2), str(4045*3)])
+ d = self.b.getValue(sha.new('4045').digest())
+ d.addCallback(self.check_values, [str(4045*2), str(4045*3)])
+
+ def test_store(self):
+ from twisted.internet.base import DelayedCall
+ DelayedCall.debug = True
+ self.lastDefer = defer.Deferred()
+ d = self.a.join()
+ d.addCallback(self.node_join)
+ d.addCallback(self.store_values)
+ return self.lastDefer
+
+ def tearDown(self):
+ self.a.leave()
+ try:
+ os.unlink(self.a.khashmir.db)
+ except:
+ pass
+ self.b.leave()
+ try:
+ os.unlink(self.b.khashmir.db)
+ except:
+ pass
+
+class TestMultiDHT(unittest.TestCase):
+
+ timeout = 60
+ num = 20
+ DHT_DEFAULTS = {'PORT': 9977, 'K': 8, 'HASH_LENGTH': 160,
+ 'CHECKPOINT_INTERVAL': 900, 'CONCURRENT_REQS': 4,
+ 'STORE_REDUNDANCY': 3, 'MAX_FAILURES': 3,
+ 'MIN_PING_INTERVAL': 900,'BUCKET_STALENESS': 3600,
+ 'KEINITIAL_DELAY': 15, 'KE_DELAY': 1200,
+ 'KE_AGE': 3600, }
+
+ def setUp(self):
+ self.l = []
+ self.startport = 4081
+ for i in range(self.num):
+ self.l.append(DHT())
+ self.l[i].config = self.DHT_DEFAULTS.copy()
+ self.l[i].config['PORT'] = self.startport + i
+ self.l[i].bootstrap = ["127.0.0.1:" + str(self.startport)]
+ self.l[i].cache_dir = '/tmp'
+ self.l[0].bootstrap_node = True
+
+ def node_join(self, result, next_node):
+ d = self.l[next_node].join()
+ if next_node + 1 < len(self.l):
+ d.addCallback(self.node_join, next_node + 1)
+ else:
+ d.addCallback(self.lastDefer.callback)
+
+ def test_join(self):
+ self.timeout = 2
+ self.lastDefer = defer.Deferred()
+ d = self.l[0].join()
+ d.addCallback(self.node_join, 1)
+ return self.lastDefer
+
+ def value_stored(self, result, value):
+ self.stored -= 1
+ if self.stored == 0:
+ self.get_values()
+
+ def store_values(self, result):
+ self.stored = 0
+ for i in range(len(self.l)):
+ for j in range(0, i+1):
+ self.stored += 1
+ d = self.l[j].storeValue(sha.new(str(self.startport+i)).digest(), str((self.startport+i)*(j+1)))
+ d.addCallback(self.value_stored, self.startport+i)
+
+ def check_values(self, result, values):
+ self.checked -= 1
+ self.failUnless(len(result) == len(values))
+ for v in result:
+ self.failUnless(v in values)
+ if self.checked == 0:
+ self.lastDefer.callback(1)
+
+ def get_values(self):
+ self.checked = 0
+ for i in range(len(self.l)):
+ for j in random.sample(xrange(len(self.l)), 4):
+ self.checked += 1
+ d = self.l[i].getValue(sha.new(str(self.startport+j)).digest())
+ check = []
+ for k in range(self.startport+j, (self.startport+j)*(j+1)+1, self.startport+j):
+ check.append(str(k))
+ d.addCallback(self.check_values, check)
+
+ def store_join(self, result, next_node):
+ d = self.l[next_node].join()
+ if next_node + 1 < len(self.l):
+ d.addCallback(self.store_join, next_node + 1)
+ else:
+ d.addCallback(self.store_values)
+
+ def test_store(self):
+ from twisted.internet.base import DelayedCall
+ DelayedCall.debug = True
+ self.lastDefer = defer.Deferred()
+ d = self.l[0].join()
+ d.addCallback(self.store_join, 1)
+ return self.lastDefer
+
+ def tearDown(self):
+ for i in self.l:
+ try:
+ i.leave()
+ os.unlink(i.khashmir.db)
+ except:
+ pass
projects / quix0rs-apt-p2p.git / blobdiff