lbry-sdk/tests/dht/testRoutingTable.py

159 lines
8.1 KiB
Python
Raw Normal View History

2015-08-20 17:27:15 +02:00
#!/usr/bin/env python
#
# This library is free software, distributed under the terms of
# the GNU Lesser General Public License Version 3, or any later version.
# See the COPYING file included in this archive
import hashlib
import unittest
import lbrynet.dht.constants
import lbrynet.dht.routingtable
import lbrynet.dht.contact
class FakeRPCProtocol(object):
""" Fake RPC protocol; allows lbrynet.dht.contact.Contact objects to "send" RPCs """
def sendRPC(self, *args, **kwargs):
return FakeDeferred()
class FakeDeferred(object):
""" Fake Twisted Deferred object; allows the routing table to add callbacks that do nothing """
def addCallback(self, *args, **kwargs):
return
def addErrback(self, *args, **kwargs):
return
class TreeRoutingTableTest(unittest.TestCase):
""" Test case for the RoutingTable class """
def setUp(self):
h = hashlib.sha1()
h.update('node1')
self.nodeID = h.digest()
self.protocol = FakeRPCProtocol()
self.routingTable = lbrynet.dht.routingtable.TreeRoutingTable(self.nodeID)
def testDistance(self):
""" Test to see if distance method returns correct result"""
# testList holds a couple 3-tuple (variable1, variable2, result)
basicTestList = [('123456789','123456789', 0L), ('12345', '98765', 34527773184L)]
for test in basicTestList:
result = self.routingTable.distance(test[0], test[1])
self.failIf(result != test[2], 'Result of _distance() should be %s but %s returned' % (test[2], result))
baseIp = '146.64.19.111'
ipTestList = ['146.64.29.222', '192.68.19.333']
distanceOne = self.routingTable.distance(baseIp, ipTestList[0])
distanceTwo = self.routingTable.distance(baseIp, ipTestList[1])
self.failIf(distanceOne > distanceTwo, '%s should be closer to the base ip %s than %s' % (ipTestList[0], baseIp, ipTestList[1]))
def testAddContact(self):
""" Tests if a contact can be added and retrieved correctly """
# Create the contact
h = hashlib.sha1()
h.update('node2')
contactID = h.digest()
contact = lbrynet.dht.contact.Contact(contactID, '127.0.0.1', 91824, self.protocol)
# Now add it...
self.routingTable.addContact(contact)
# ...and request the closest nodes to it (will retrieve it)
closestNodes = self.routingTable.findCloseNodes(contactID, lbrynet.dht.constants.k)
self.failUnlessEqual(len(closestNodes), 1, 'Wrong amount of contacts returned; expected 1, got %d' % len(closestNodes))
self.failUnless(contact in closestNodes, 'Added contact not found by issueing _findCloseNodes()')
def testGetContact(self):
""" Tests if a specific existing contact can be retrieved correctly """
h = hashlib.sha1()
h.update('node2')
contactID = h.digest()
contact = lbrynet.dht.contact.Contact(contactID, '127.0.0.1', 91824, self.protocol)
# Now add it...
self.routingTable.addContact(contact)
# ...and get it again
sameContact = self.routingTable.getContact(contactID)
self.failUnlessEqual(contact, sameContact, 'getContact() should return the same contact')
def testAddParentNodeAsContact(self):
""" Tests the routing table's behaviour when attempting to add its parent node as a contact """
# Create a contact with the same ID as the local node's ID
contact = lbrynet.dht.contact.Contact(self.nodeID, '127.0.0.1', 91824, self.protocol)
# Now try to add it
self.routingTable.addContact(contact)
# ...and request the closest nodes to it using FIND_NODE
closestNodes = self.routingTable.findCloseNodes(self.nodeID, lbrynet.dht.constants.k)
self.failIf(contact in closestNodes, 'Node added itself as a contact')
def testRemoveContact(self):
""" Tests contact removal """
# Create the contact
h = hashlib.sha1()
h.update('node2')
contactID = h.digest()
contact = lbrynet.dht.contact.Contact(contactID, '127.0.0.1', 91824, self.protocol)
# Now add it...
self.routingTable.addContact(contact)
# Verify addition
self.failUnlessEqual(len(self.routingTable._buckets[0]), 1, 'Contact not added properly')
# Now remove it
self.routingTable.removeContact(contact.id)
self.failUnlessEqual(len(self.routingTable._buckets[0]), 0, 'Contact not removed properly')
def testSplitBucket(self):
""" Tests if the the routing table correctly dynamically splits k-buckets """
self.failUnlessEqual(self.routingTable._buckets[0].rangeMax, 2**160, 'Initial k-bucket range should be 0 <= range < 2**160')
# Add k contacts
for i in range(lbrynet.dht.constants.k):
h = hashlib.sha1()
h.update('remote node %d' % i)
nodeID = h.digest()
contact = lbrynet.dht.contact.Contact(nodeID, '127.0.0.1', 91824, self.protocol)
self.routingTable.addContact(contact)
self.failUnlessEqual(len(self.routingTable._buckets), 1, 'Only k nodes have been added; the first k-bucket should now be full, but should not yet be split')
# Now add 1 more contact
h = hashlib.sha1()
h.update('yet another remote node')
nodeID = h.digest()
contact = lbrynet.dht.contact.Contact(nodeID, '127.0.0.1', 91824, self.protocol)
self.routingTable.addContact(contact)
self.failUnlessEqual(len(self.routingTable._buckets), 2, 'k+1 nodes have been added; the first k-bucket should have been split into two new buckets')
self.failIfEqual(self.routingTable._buckets[0].rangeMax, 2**160, 'K-bucket was split, but its range was not properly adjusted')
self.failUnlessEqual(self.routingTable._buckets[1].rangeMax, 2**160, 'K-bucket was split, but the second (new) bucket\'s max range was not set properly')
self.failUnlessEqual(self.routingTable._buckets[0].rangeMax, self.routingTable._buckets[1].rangeMin, 'K-bucket was split, but the min/max ranges were not divided properly')
def testFullBucketNoSplit(self):
""" Test that a bucket is not split if it full, but does not cover the range containing the parent node's ID """
self.routingTable._parentNodeID = 21*'a' # more than 160 bits; this will not be in the range of _any_ k-bucket
# Add k contacts
for i in range(lbrynet.dht.constants.k):
h = hashlib.sha1()
h.update('remote node %d' % i)
nodeID = h.digest()
contact = lbrynet.dht.contact.Contact(nodeID, '127.0.0.1', 91824, self.protocol)
self.routingTable.addContact(contact)
self.failUnlessEqual(len(self.routingTable._buckets), 1, 'Only k nodes have been added; the first k-bucket should now be full, and there should not be more than 1 bucket')
self.failUnlessEqual(len(self.routingTable._buckets[0]._contacts), lbrynet.dht.constants.k, 'Bucket should have k contacts; expected %d got %d' % (lbrynet.dht.constants.k, len(self.routingTable._buckets[0]._contacts)))
# Now add 1 more contact
h = hashlib.sha1()
h.update('yet another remote node')
nodeID = h.digest()
contact = lbrynet.dht.contact.Contact(nodeID, '127.0.0.1', 91824, self.protocol)
self.routingTable.addContact(contact)
self.failUnlessEqual(len(self.routingTable._buckets), 1, 'There should not be more than 1 bucket, since the bucket should not have been split (parent node ID not in range)')
self.failUnlessEqual(len(self.routingTable._buckets[0]._contacts), lbrynet.dht.constants.k, 'Bucket should have k contacts; expected %d got %d' % (lbrynet.dht.constants.k, len(self.routingTable._buckets[0]._contacts)))
self.failIf(contact in self.routingTable._buckets[0]._contacts, 'New contact should have been discarded (since RPC is faked in this test)')
def suite():
suite = unittest.TestSuite()
suite.addTest(unittest.makeSuite(TreeRoutingTableTest))
return suite
if __name__ == '__main__':
# If this module is executed from the commandline, run all its tests
unittest.TextTestRunner().run(suite())