def test_add_contact_with_parent_node_id(self):
"""
If the newly discovered contact is, in fact, this node then it's not
added to the routing table.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact = PeerNode('abc', '192.168.0.1', 9999, 0)
r.add_contact(contact)
self.assertEqual(len(r._buckets[0]), 0)
def test_get_contact(self):
"""
Ensures that the correct contact is returned.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode('a', '192.168.0.1', 9999, self.version, 0)
r.add_contact(contact1)
result = r.get_contact('a')
self.assertEqual(contact1, result)
def test_get_contact_does_not_exist(self):
"""
Ensures that a ValueError is returned if the referenced contact does
not exist in the routing table.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode('a', '192.168.0.1', 9999, self.version, 0)
r.add_contact(contact1)
self.assertRaises(ValueError, r.get_contact, 'b')
def test_random_key_in_bucket_range(self):
"""
Ensures the returned key is within the expected bucket range.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
bucket = Bucket(1, 2)
r._buckets[0] = bucket
expected = 1
actual = int(r._random_key_in_bucket_range(0).encode('hex'), 16)
self.assertEqual(expected, actual)
def test_blacklist(self):
"""
Ensures a misbehaving peer is correctly blacklisted. The remove_contact
method is called and the contact's id is added to the _blacklist set.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact = PeerNode('abc', '192.168.0.1', 9999, 0)
r.remove_contact = MagicMock()
r.blacklist(contact)
r.remove_contact.called_once_with(contact, True)
self.assertIn(contact.network_id, r._blacklist)
def test_bucket_index_single_bucket(self):
"""
Ensures the expected index is returned when only a single bucket
exists.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# a simple test with only one bucket in the routing table.
test_key = 'abc123'
expected_index = 0
actual_index = r._bucket_index(test_key)
self.assertEqual(expected_index, actual_index)
def test_find_close_nodes_fewer_than_K(self):
"""
Ensures that all close nodes are returned if their number is < K.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket and replacement cache
for i in range(10):
contact = PeerNode(i, "192.168.0.%d" % i, 9999, self.version, 0)
r.add_contact(contact)
result = r.find_close_nodes(hex(1))
self.assertEqual(10, len(result))
def test_find_close_nodes_single_bucket(self):
"""
Ensures K number of closest nodes get returned.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket and replacement cache
for i in range(40):
contact = PeerNode(i, "192.168.0.%d" % i, 9999, self.version, 0)
r.add_contact(contact)
result = r.find_close_nodes(hex(1))
self.assertEqual(constants.K, len(result))
def test_random_key_in_bucket_range_long(self):
"""
Ensures that random_key_in_bucket_range works with large numbers.
"""
minimum = 978675645342314253647586978
maximum = 978675645342314253647586979
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
bucket = Bucket(minimum, maximum)
r._buckets[0] = bucket
expected = minimum
actual = int(r._random_key_in_bucket_range(0).encode('hex'), 16)
self.assertEqual(expected, actual)
def test_find_close_nodes_exclude_contact(self):
"""
Ensure that nearest nodes are returned except for the specified
excluded node.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket and replacement cache
for i in range(20):
contact = PeerNode(i, "192.168.0.%d" % i, 9999, self.version, 0)
r.add_contact(contact)
result = r.find_close_nodes(hex(1), network_id=contact.network_id)
self.assertEqual(constants.K - 1, len(result))
def test_add_contact_simple(self):
"""
Ensures that a newly discovered node in the network is added to the
correct bucket in the routing table.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode(2, '192.168.0.1', 9999, 0)
contact2 = PeerNode(4, '192.168.0.2', 9999, 0)
r.add_contact(contact1)
self.assertEqual(len(r._buckets[0]), 1)
r.add_contact(contact2)
self.assertEqual(len(r._buckets[0]), 2)
def test_touch_bucket(self):
"""
Ensures that the lastAccessed field of the affected k-bucket is updated
appropriately.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# At this point the single k-bucket in the routing table will have a
# lastAccessed time of 0 (zero). Sanity check.
self.assertEqual(0, r._buckets[0].last_accessed)
# Since all keys are in the range of the single k-bucket any key will
# do for the purposes of testing.
r.touch_bucket('xyz')
self.assertNotEqual(0, r._buckets[0].last_accessed)
def test_find_close_nodes_multiple_buckets(self):
"""
Ensures that nodes are returned from neighbouring k-buckets if the
k-bucket containing the referenced ID doesn't contain K entries.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket and replacement cache
for i in range(512):
contact = PeerNode(2 ** i, "192.168.0.%d" % i, 9999, self.version,
0)
r.add_contact(contact)
result = r.find_close_nodes(long_to_hex(2 ** 256))
self.assertEqual(constants.K, len(result))
def test_remove_contact_with_cached_replacement(self):
"""
Ensures that the removed contact is replaced by the most up-to-date
contact in the affected k-bucket's cache.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode('a', '192.168.0.1', 9999, self.version, 0)
contact2 = PeerNode('b', '192.168.0.2', 9999, self.version, 0)
r.add_contact(contact1)
# contact2 will have the wrong number of failedRPCs
r.add_contact(contact2)
contact2.failed_RPCs = constants.ALLOWED_RPC_FAILS
# Add something into the cache.
contact3 = PeerNode('c', '192.168.0.3', 9999, self.version, 0)
r._replacement_cache[0] = [contact3, ]
# Sanity check
self.assertEqual(len(r._buckets[0]), 2)
self.assertEqual(len(r._replacement_cache[0]), 1)
r.remove_contact('b')
self.assertEqual(len(r._buckets[0]), 2)
self.assertEqual(contact1, r._buckets[0]._contacts[0])
self.assertEqual(contact3, r._buckets[0]._contacts[1])
self.assertEqual(len(r._replacement_cache[0]), 0)
def test_remove_contact_with_unknown_contact(self):
"""
Ensures that attempting to remove a non-existent contact results in a
ValueError exception.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode('a', '192.168.0.1', 9999, self.version, 0)
r.add_contact(contact1)
# Sanity check
self.assertEqual(len(r._buckets[0]), 1)
result = r.remove_contact('b')
self.assertEqual(None, result)
self.assertEqual(len(r._buckets[0]), 1)
self.assertEqual(contact1, r._buckets[0]._contacts[0])
def test_split_bucket(self):
"""
Ensures that the correct bucket is split in two and that the contacts
are found in the right place.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
bucket = Bucket(0, 10)
contact1 = PeerNode(2, '192.168.0.1', 9999, 0)
bucket.add_contact(contact1)
contact2 = PeerNode(4, '192.168.0.2', 8888, 0)
bucket.add_contact(contact2)
contact3 = PeerNode(6, '192.168.0.3', 8888, 0)
bucket.add_contact(contact3)
contact4 = PeerNode(8, '192.168.0.4', 8888, 0)
bucket.add_contact(contact4)
r._buckets[0] = bucket
# Sanity check
self.assertEqual(1, len(r._buckets))
r._split_bucket(0)
# Two buckets!
self.assertEqual(2, len(r._buckets))
bucket1 = r._buckets[0]
bucket2 = r._buckets[1]
# Ensure the right number of contacts are in each bucket in the correct
# order (most recently added at the head of the list).
self.assertEqual(2, len(bucket1._contacts))
self.assertEqual(2, len(bucket2._contacts))
self.assertEqual(contact1, bucket1._contacts[0])
self.assertEqual(contact2, bucket1._contacts[1])
self.assertEqual(contact3, bucket2._contacts[0])
self.assertEqual(contact4, bucket2._contacts[1])
# Split the new bucket again, ensuring that only the target bucket is
# modified.
r._split_bucket(1)
self.assertEqual(3, len(r._buckets))
bucket3 = r._buckets[2]
# bucket1 remains un-changed
self.assertEqual(2, len(bucket1._contacts))
# bucket2 only contains the lower half of its original contacts.
self.assertEqual(1, len(bucket2._contacts))
self.assertEqual(contact3, bucket2._contacts[0])
# bucket3 now contains the upper half of the original contacts.
self.assertEqual(1, len(bucket3._contacts))
self.assertEqual(contact4, bucket3._contacts[0])
# Split the bucket at position 0 and ensure the resulting buckets are
# in the correct position with the correct content.
r._split_bucket(0)
self.assertEqual(4, len(r._buckets))
bucket1, bucket2, bucket3, bucket4 = r._buckets
self.assertEqual(1, len(bucket1._contacts))
self.assertEqual(contact1, bucket1._contacts[0])
self.assertEqual(1, len(bucket2._contacts))
self.assertEqual(contact2, bucket2._contacts[0])
self.assertEqual(1, len(bucket3._contacts))
self.assertEqual(contact3, bucket3._contacts[0])
self.assertEqual(1, len(bucket4._contacts))
self.assertEqual(contact4, bucket4._contacts[0])
def test_remove_contact_with_not_enough_RPC_fails(self):
"""
Ensures that the contact is not removed if it's failedRPCs counter is
less than constants.ALLOWED_RPC_FAILS
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode('a', '192.168.0.1', 9999, self.version, 0)
contact2 = PeerNode('b', '192.168.0.2', 9999, self.version, 0)
r.add_contact(contact1)
r.add_contact(contact2)
# Sanity check
self.assertEqual(len(r._buckets[0]), 2)
r.remove_contact('b')
self.assertEqual(len(r._buckets[0]), 2)
def test_bucket_index_multiple_buckets(self):
"""
Ensures the expected index is returned when multiple buckets exist.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
r._split_bucket(0)
split_point = (2 ** 512) / 2
lower_key = split_point - 1
higher_key = split_point + 1
expected_lower_index = 0
expected_higher_index = 1
actual_lower_index = r._bucket_index(lower_key)
actual_higher_index = r._bucket_index(higher_key)
self.assertEqual(expected_lower_index, actual_lower_index)
self.assertEqual(expected_higher_index, actual_higher_index)
def test_bucket_index_as_string_and_int(self):
"""
Ensures that the specified key can be expressed as both a string
and integer value.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# key as a string
test_key = 'abc123'
expected_index = 0
actual_index = r._bucket_index(test_key)
self.assertEqual(expected_index, actual_index)
# key as an integer
test_key = 1234567
actual_index = r._bucket_index(test_key)
self.assertEqual(expected_index, actual_index)
def test_add_contact_id_out_of_range(self):
"""
Ensures a PeerNode with an out-of-range id cannot be added to the
routing table.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
with self.assertRaises(TypeError):
# id too small
contact = PeerNode(-1, '192.168.0.1', 9999, self.version, 0)
r.add_contact(contact)
with self.assertRaises(ValueError):
# id too big
big_id = (2 ** 512)
contact = PeerNode(big_id, '192.168.0.1', 9999, self.version, 0)
r.add_contact(contact)
def test_remove_contact_with_not_enough_RPC_but_forced(self):
"""
Ensures that the contact is removed despite it's failedRPCs counter
being less than constants.ALLOWED_RPC_FAILS because the 'forced' flag
is used.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode('a', '192.168.0.1', 9999, self.version, 0)
contact2 = PeerNode('b', '192.168.0.2', 9999, self.version, 0)
r.add_contact(contact1)
r.add_contact(contact2)
# Sanity check
self.assertEqual(len(r._buckets[0]), 2)
r.remove_contact('b', forced=True)
self.assertEqual(len(r._buckets[0]), 1)
def test_get_refresh_list(self):
"""
Ensures that only keys from stale k-buckets are returned.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
bucket1 = Bucket(1, 2)
# Set the lastAccessed flag on bucket 1 to be out of date
bucket1.last_accessed = int(time.time()) - 3700
r._buckets[0] = bucket1
bucket2 = Bucket(2, 3)
bucket2.last_accessed = int(time.time())
r._buckets.append(bucket2)
expected = 1
result = r.get_refresh_list(0)
self.assertEqual(1, len(result))
self.assertEqual(expected, int(result[0].encode('hex'), 16))
def test_add_contact_with_bucket_split(self):
"""
Ensures that newly discovered nodes are added to the appropriate
bucket given a bucket split.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
for i in range(20):
contact = PeerNode(i, '192.168.0.%d' % i, 9999, self.version, 0)
r.add_contact(contact)
# This id will be just over the max range for the bucket in position 0
large_id = ((2 ** 512) / 2) + 1
contact = PeerNode(large_id, '192.168.0.33', 9999, self.version, 0)
r.add_contact(contact)
self.assertEqual(len(r._buckets), 2)
self.assertEqual(len(r._buckets[0]), 20)
self.assertEqual(len(r._buckets[1]), 1)
def test_add_contact_with_bucket_full(self):
"""
Checks if a bucket is full and a new contact within the full bucket's
range is added then it gets put in the replacement cache.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket
for i in range(20):
contact = PeerNode(i, '192.168.0.%d' % i, 9999, self.version, 0)
r.add_contact(contact)
# Create a new contact that will be added to the replacement cache.
contact = PeerNode(20, '192.168.0.20', 9999, self.version, 0)
r.add_contact(contact)
self.assertEqual(len(r._buckets[0]), 20)
self.assertTrue(0 in r._replacement_cache)
self.assertEqual(contact, r._replacement_cache[0][0])
def test_get_forced_refresh_list(self):
"""
Ensures that keys from all k-buckets (no matter if they're stale or
not) are returned.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
bucket1 = Bucket(1, 2)
# Set the lastAccessed flag on bucket 1 to be out of date
bucket1.last_accessed = int(time.time()) - 3700
r._buckets[0] = bucket1
bucket2 = Bucket(2, 3)
bucket2.last_accessed = int(time.time())
r._buckets.append(bucket2)
result = r.get_refresh_list(0, True)
# Even though bucket 2 is not stale it still has a key for it in
# the result.
self.assertEqual(2, len(result))
self.assertEqual(1, int(result[0].encode('hex'), 16))
self.assertEqual(2, int(result[1].encode('hex'), 16))
def test_add_contact_with_full_replacement_cache(self):
"""
Ensures that if the replacement cache is full (length = k) then the
oldest contact within the cache is replaced with the new contact that
was just seen.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket and replacement cache
for i in range(40):
contact = PeerNode(str(i), "192.168.0.%d" % i, 9999, self.version,
0)
r.add_contact(contact)
# Sanity check of the replacement cache.
self.assertEqual(len(r._replacement_cache[0]), 20)
self.assertEqual('20', r._replacement_cache[0][0].network_id)
# Create a new contact that will be added to the replacement cache.
new_contact = PeerNode('40', "192.168.0.20", 9999, self.version, 0)
r.add_contact(new_contact)
self.assertEqual(len(r._replacement_cache[0]), 20)
self.assertEqual(new_contact, r._replacement_cache[0][19])
self.assertEqual('21', r._replacement_cache[0][0].network_id)
def test_add_contact_with_existing_contact_in_replacement_cache(self):
"""
Ensures that if the contact to be put in the replacement cache already
exists in the replacement cache then it is bumped to the most recent
position.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket and replacement cache
for i in range(40):
contact = PeerNode(str(i), '192.168.0.%d' % i, 9999, self.version,
0)
r.add_contact(contact)
# Sanity check of the replacement cache.
self.assertEqual(len(r._replacement_cache[0]), 20)
self.assertEqual('20', r._replacement_cache[0][0].network_id)
# Create a new contact that will be added to the replacement cache.
new_contact = PeerNode('20', '192.168.0.20', 9999, self.version, 0)
r.add_contact(new_contact)
self.assertEqual(len(r._replacement_cache[0]), 20)
self.assertEqual(new_contact, r._replacement_cache[0][19])
self.assertEqual('21', r._replacement_cache[0][0].network_id)
def test_find_close_nodes_in_correct_order(self):
"""
Ensures that the nearest nodes are returned in the correct order: from
the node closest to the target key to the node furthest away.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Fill up the bucket and replacement cache
for i in range(512):
contact = PeerNode(2 ** i, "192.168.0.%d" % i, 9999, self.version,
0)
r.add_contact(contact)
target_key = long_to_hex(2 ** 256)
result = r.find_close_nodes(target_key)
self.assertEqual(constants.K, len(result))
# Ensure results are in the correct order.
def key(node):
return distance(node.network_id, target_key)
sorted_nodes = sorted(result, key=key)
self.assertEqual(sorted_nodes, result)
# Ensure the order is from lowest to highest in terms of distance
distances = [distance(x.network_id, target_key) for x in result]
self.assertEqual(sorted(distances), distances)
def test_add_contact_with_blacklisted_contact(self):
"""
If the newly discovered contact is, in fact, already in the local
node's blacklist then ensure it doesn't get re-added.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
contact1 = PeerNode(2, '192.168.0.1', 9999, 0)
contact2 = PeerNode(4, '192.168.0.2', 9999, 0)
r.blacklist(contact2)
r.add_contact(contact1)
self.assertEqual(len(r._buckets[0]), 1)
r.add_contact(contact2)
self.assertEqual(len(r._buckets[0]), 1)
def test_bucket_index_out_of_range(self):
"""
If the requested id is not within the range of the keyspace then a
ValueError should be raised.
"""
parent_node_id = 'abc'
r = RoutingTable(parent_node_id)
# Populate the routing table with contacts.
for i in range(512):
contact = PeerNode(2 ** i, "192.168.0.%d" % i, 9999, self.version,
0)
r.add_contact(contact)
with self.assertRaises(ValueError):
# Incoming id that's too small.
r.find_close_nodes(-1)
with self.assertRaises(ValueError):
# Incoming id that's too big
big_id = 2 ** 512
r.find_close_nodes(big_id)