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This commit is contained in:
Alex Grintsvayg 2017-03-31 13:32:43 -04:00
parent 5ec891c9ac
commit 850f51140e
13 changed files with 105 additions and 65 deletions
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1
.gitignore vendored
View file

@ -6,6 +6,7 @@
*.log
*.pem
*.decTest
*.prof
.#*
/build

10
lbrynet/dht/constants.py
View file

@ -28,14 +28,14 @@ rpcTimeout = 5
iterativeLookupDelay = rpcTimeout / 2
#: If a k-bucket has not been used for this amount of time, refresh it (in seconds)
refreshTimeout = 3600 # 1 hour
refreshTimeout = 3600 # 1 hour
#: The interval at which nodes replicate (republish/refresh) data they are holding
replicateInterval = refreshTimeout
# The time it takes for data to expire in the network; the original publisher of the data
# will also republish the data at this time if it is still valid
dataExpireTimeout = 86400 # 24 hours
dataExpireTimeout = 86400 # 24 hours
tokenSecretChangeInterval = 300 # 5 minutes
tokenSecretChangeInterval = 300 # 5 minutes
peer_request_timeout = 10
@ -43,10 +43,10 @@ peer_request_timeout = 10
#: The interval in which the node should check its whether any buckets need refreshing,
#: or whether any data needs to be republished (in seconds)
checkRefreshInterval = refreshTimeout/5
checkRefreshInterval = refreshTimeout / 5
#: Max size of a single UDP datagram, in bytes. If a message is larger than this, it will
#: be spread accross several UDP packets.
udpDatagramMaxSize = 8192 # 8 KB
udpDatagramMaxSize = 8192 # 8 KB
key_bits = 384

3
lbrynet/dht/contact.py
View file

@ -14,6 +14,7 @@ class Contact(object):
This class contains information on a single remote contact, and also
provides a direct RPC API to the remote node which it represents
"""
def __init__(self, id, ipAddress, udpPort, networkProtocol, firstComm=0):
self.id = id
self.address = ipAddress
@ -60,6 +61,8 @@ class Contact(object):
This happens via this contact's C{_networkProtocol} object (i.e. the
host Node's C{_protocol} object).
"""
def _sendRPC(*args, **kwargs):
return self._networkProtocol.sendRPC(self, name, args, **kwargs)
return _sendRPC

6
lbrynet/dht/datastore.py
View file

@ -12,21 +12,23 @@ import time
import constants
class DataStore(UserDict.DictMixin):
""" Interface for classes implementing physical storage (for data
published via the "STORE" RPC) for the Kademlia DHT
@note: This provides an interface for a dict-like object
"""
def keys(self):
""" Return a list of the keys in this data store """
def addPeerToBlob(self, key, value, lastPublished, originallyPublished, originalPublisherID):
pass
class DictDataStore(DataStore):
""" A datastore using an in-memory Python dictionary """
def __init__(self):
# Dictionary format:
# { <key>: (<value>, <lastPublished>, <originallyPublished> <originalPublisherID>) }
@ -38,10 +40,12 @@ class DictDataStore(DataStore):
def removeExpiredPeers(self):
now = int(time.time())
def notExpired(peer):
if (now - peer[2]) > constants.dataExpireTimeout:
return False
return True
for key in self._dict.keys():
unexpired_peers = filter(notExpired, self._dict[key])
self._dict[key] = unexpired_peers

22
lbrynet/dht/encoding.py
View file

@ -12,12 +12,14 @@ class DecodeError(Exception):
fails
"""
class Encoding(object):
""" Interface for RPC message encoders/decoders
All encoding implementations used with this library should inherit and
implement this.
"""
def encode(self, data):
""" Encode the specified data
@ -31,6 +33,7 @@ class Encoding(object):
@return: The encoded data
@rtype: str
"""
def decode(self, data):
""" Decode the specified data string
@ -40,6 +43,7 @@ class Encoding(object):
@return: The decoded data (in its correct type)
"""
class Bencode(Encoding):
""" Implementation of a Bencode-based algorithm (Bencode is the encoding
algorithm used by Bittorrent).
@ -112,15 +116,15 @@ class Bencode(Encoding):
Do not call this; use C{decode()} instead
"""
if data[startIndex] == 'i':
endPos = data[startIndex:].find('e')+startIndex
return (int(data[startIndex+1:endPos]), endPos+1)
endPos = data[startIndex:].find('e') + startIndex
return (int(data[startIndex + 1:endPos]), endPos + 1)
elif data[startIndex] == 'l':
startIndex += 1
decodedList = []
while data[startIndex] != 'e':
listData, startIndex = Bencode._decodeRecursive(data, startIndex)
decodedList.append(listData)
return (decodedList, startIndex+1)
return (decodedList, startIndex + 1)
elif data[startIndex] == 'd':
startIndex += 1
decodedDict = {}
@ -131,19 +135,19 @@ class Bencode(Encoding):
return (decodedDict, startIndex)
elif data[startIndex] == 'f':
# This (float data type) is a non-standard extension to the original Bencode algorithm
endPos = data[startIndex:].find('e')+startIndex
return (float(data[startIndex+1:endPos]), endPos+1)
endPos = data[startIndex:].find('e') + startIndex
return (float(data[startIndex + 1:endPos]), endPos + 1)
elif data[startIndex] == 'n':
# This (None/NULL data type) is a non-standard extension
# to the original Bencode algorithm
return (None, startIndex+1)
return (None, startIndex + 1)
else:
splitPos = data[startIndex:].find(':')+startIndex
splitPos = data[startIndex:].find(':') + startIndex
try:
length = int(data[startIndex:splitPos])
except ValueError, e:
raise DecodeError, e
startIndex = splitPos+1
endPos = startIndex+length
startIndex = splitPos + 1
endPos = startIndex + length
bytes = data[startIndex:endPos]
return (bytes, endPos)

1
lbrynet/dht/hashwatcher.py
View file

@ -1,4 +1,3 @@
from collections import Counter
import datetime

2
lbrynet/dht/kbucket.py
View file

@ -9,6 +9,7 @@
import constants
class BucketFull(Exception):
""" Raised when the bucket is full """
@ -16,6 +17,7 @@ class BucketFull(Exception):
class KBucket(object):
""" Description - later
"""
def __init__(self, rangeMin, rangeMax):
"""
@param rangeMin: The lower boundary for the range in the n-bit ID

5
lbrynet/dht/msgformat.py
View file

@ -9,6 +9,7 @@
import msgtypes
class MessageTranslator(object):
""" Interface for RPC message translators/formatters
@ -16,6 +17,7 @@ class MessageTranslator(object):
the classes used internally by this Kademlia implementation and the actual
data that is transmitted between nodes.
"""
def fromPrimitive(self, msgPrimitive):
""" Create an RPC Message from a message's string representation
@ -37,6 +39,7 @@ class MessageTranslator(object):
@rtype: str, int, list or dict
"""
class DefaultFormat(MessageTranslator):
""" The default on-the-wire message format for this library """
typeRequest, typeResponse, typeError = range(3)
@ -64,7 +67,7 @@ class DefaultFormat(MessageTranslator):
return msg
def toPrimitive(self, message):
msg = {self.headerMsgID: message.id,
msg = {self.headerMsgID: message.id,
self.headerNodeID: message.nodeID}
if isinstance(message, msgtypes.RequestMessage):
msg[self.headerType] = self.typeRequest

5
lbrynet/dht/msgtypes.py
View file

@ -10,8 +10,10 @@
import hashlib
import random
class Message(object):
""" Base class for messages - all "unknown" messages use this class """
def __init__(self, rpcID, nodeID):
self.id = rpcID
self.nodeID = nodeID
@ -19,6 +21,7 @@ class Message(object):
class RequestMessage(Message):
""" Message containing an RPC request """
def __init__(self, nodeID, method, methodArgs, rpcID=None):
if rpcID == None:
hash = hashlib.sha384()
@ -31,6 +34,7 @@ class RequestMessage(Message):
class ResponseMessage(Message):
""" Message containing the result from a successful RPC request """
def __init__(self, rpcID, nodeID, response):
Message.__init__(self, rpcID, nodeID)
self.response = response
@ -38,6 +42,7 @@ class ResponseMessage(Message):
class ErrorMessage(ResponseMessage):
""" Message containing the error from an unsuccessful RPC request """
def __init__(self, rpcID, nodeID, exceptionType, errorMessage):
ResponseMessage.__init__(self, rpcID, nodeID, errorMessage)
if isinstance(exceptionType, type):

43
lbrynet/dht/node.py
View file

@ -27,7 +27,6 @@ from contact import Contact
from hashwatcher import HashWatcher
import logging
log = logging.getLogger(__name__)
@ -51,6 +50,7 @@ class Node(object):
In Entangled, all interactions with the Kademlia network by a client
application is performed via this class (or a subclass).
"""
def __init__(self, id=None, udpPort=4000, dataStore=None,
routingTableClass=None, networkProtocol=None, lbryid=None,
externalIP=None):
@ -82,7 +82,7 @@ class Node(object):
self.id = self._generateID()
self.lbryid = lbryid
self.port = udpPort
self._listeningPort = None # object implementing Twisted
self._listeningPort = None # object implementing Twisted
# IListeningPort This will contain a deferred created when
# joining the network, to enable publishing/retrieving
# information from the DHT as soon as the node is part of the
@ -126,7 +126,7 @@ class Node(object):
self._listeningPort.stopListening()
def stop(self):
#cancel callLaters:
# cancel callLaters:
if self.next_refresh_call is not None:
self.next_refresh_call.cancel()
self.next_refresh_call = None
@ -137,7 +137,6 @@ class Node(object):
self._listeningPort.stopListening()
self.hash_watcher.stop()
def joinNetwork(self, knownNodeAddresses=None):
""" Causes the Node to join the Kademlia network; normally, this
should be called before any other DHT operations.
@ -156,7 +155,7 @@ class Node(object):
import traceback
log.error("Couldn't bind to port %d. %s", self.port, traceback.format_exc())
raise ValueError("%s lbrynet may already be running." % str(e))
#IGNORE:E1101
# IGNORE:E1101
# Create temporary contact information for the list of addresses of known nodes
if knownNodeAddresses != None:
bootstrapContacts = []
@ -167,10 +166,10 @@ class Node(object):
bootstrapContacts = None
# Initiate the Kademlia joining sequence - perform a search for this node's own ID
self._joinDeferred = self._iterativeFind(self.id, bootstrapContacts)
# #TODO: Refresh all k-buckets further away than this node's closest neighbour
# #TODO: Refresh all k-buckets further away than this node's closest neighbour
# Start refreshing k-buckets periodically, if necessary
self.next_refresh_call = twisted.internet.reactor.callLater(
constants.checkRefreshInterval, self._refreshNode) #IGNORE:E1101
constants.checkRefreshInterval, self._refreshNode) # IGNORE:E1101
self.hash_watcher.tick()
return self._joinDeferred
@ -187,7 +186,7 @@ class Node(object):
# estimate!
bucket = self._routingTable._buckets[self._routingTable._kbucketIndex(self.id)]
num_in_bucket = len(bucket._contacts)
factor = (2**constants.key_bits) / (bucket.rangeMax - bucket.rangeMin)
factor = (2 ** constants.key_bits) / (bucket.rangeMax - bucket.rangeMin)
return num_in_bucket * factor
def getApproximateTotalHashes(self):
@ -253,7 +252,7 @@ class Node(object):
# The "raw response" tuple contains the response message,
# and the originating address info
responseMsg = responseTuple[0]
originAddress = responseTuple[1] # tuple: (ip adress, udp port)
originAddress = responseTuple[1] # tuple: (ip adress, udp port)
# Make sure the responding node is valid, and abort the operation if it isn't
if not responseMsg.nodeID in known_nodes:
return responseMsg.nodeID
@ -351,10 +350,11 @@ class Node(object):
"""
# Prepare a callback for this operation
outerDf = defer.Deferred()
def checkResult(result):
if type(result) == dict:
# We have found the value; now see who was the closest contact without it...
# ...and store the key/value pair
# ...and store the key/value pair
outerDf.callback(result)
else:
# The value wasn't found, but a list of contacts was returned
@ -416,6 +416,7 @@ class Node(object):
return contact
else:
return None
df = self.iterativeFindNode(contactID)
df.addCallback(parseResults)
return df
@ -466,10 +467,10 @@ class Node(object):
compact_ip = contact.compact_ip()
else:
return 'Not OK'
#raise TypeError, 'No contact info available'
# raise TypeError, 'No contact info available'
if ((self_store is False) and
(not 'token' in value or not self.verify_token(value['token'], compact_ip))):
(not 'token' in value or not self.verify_token(value['token'], compact_ip))):
raise ValueError('Invalid or missing token')
if 'port' in value:
@ -490,7 +491,7 @@ class Node(object):
raise TypeError, 'No lbryid given'
now = int(time.time())
originallyPublished = now# - age
originallyPublished = now # - age
self._dataStore.addPeerToBlob(
key, compact_address, now, originallyPublished, originalPublisherID)
return 'OK'
@ -618,6 +619,7 @@ class Node(object):
def _refreshRoutingTable(self):
nodeIDs = self._routingTable.getRefreshList(0, False)
outerDf = defer.Deferred()
def searchForNextNodeID(dfResult=None):
if len(nodeIDs) > 0:
searchID = nodeIDs.pop()
@ -626,16 +628,16 @@ class Node(object):
else:
# If this is reached, we have finished refreshing the routing table
outerDf.callback(None)
# Start the refreshing cycle
searchForNextNodeID()
return outerDf
def _scheduleNextNodeRefresh(self, *args):
self.next_refresh_call = twisted.internet.reactor.callLater(
constants.checkRefreshInterval, self._refreshNode)
#args put here because _refreshRoutingTable does outerDF.callback(None)
# args put here because _refreshRoutingTable does outerDF.callback(None)
def _removeExpiredPeers(self, *args):
df = twisted.internet.threads.deferToThread(self._dataStore.removeExpiredPeers)
return df
@ -679,7 +681,7 @@ class _IterativeFindHelper(object):
# The "raw response" tuple contains the response message,
# and the originating address info
responseMsg = responseTuple[0]
originAddress = responseTuple[1] # tuple: (ip adress, udp port)
originAddress = responseTuple[1] # tuple: (ip adress, udp port)
# Make sure the responding node is valid, and abort the operation if it isn't
if responseMsg.nodeID in self.active_contacts or responseMsg.nodeID == self.node.id:
return responseMsg.nodeID
@ -693,7 +695,7 @@ class _IterativeFindHelper(object):
self.already_contacted.append(responseMsg.nodeID)
# Now grow extend the (unverified) shortlist with the returned contacts
result = responseMsg.response
#TODO: some validation on the result (for guarding against attacks)
# TODO: some validation on the result (for guarding against attacks)
# If we are looking for a value, first see if this result is the value
# we are looking for before treating it as a list of contact triples
if self.find_value is True and self.key in result and not 'contacts' in result:
@ -756,7 +758,7 @@ class _IterativeFindHelper(object):
def cancelActiveProbe(self, contactID):
self.active_probes.pop()
if len(self.active_probes) <= constants.alpha/2 and len(self.pending_iteration_calls):
if len(self.active_probes) <= constants.alpha / 2 and len(self.pending_iteration_calls):
# Force the iteration
self.pending_iteration_calls[0].cancel()
del self.pending_iteration_calls[0]
@ -804,7 +806,7 @@ class _IterativeFindHelper(object):
# Schedule the next iteration if there are any active
# calls (Kademlia uses loose parallelism)
call = twisted.internet.reactor.callLater(
constants.iterativeLookupDelay, self.searchIteration) #IGNORE:E1101
constants.iterativeLookupDelay, self.searchIteration) # IGNORE:E1101
self.pending_iteration_calls.append(call)
# Check for a quick contact response that made an update to the shortList
elif prevShortlistLength < len(self.shortlist):
@ -850,6 +852,7 @@ class Distance(object):
Frequently we re-use one of the points so as an optimization
we pre-calculate the long value of that point.
"""
def __init__(self, key):
self.key = key
self.val_key_one = long(key.encode('hex'), 16)
@ -879,6 +882,7 @@ class ExpensiveSort(object):
key: callable, like `key` in normal python sort
attr: the attribute name used to cache the value on each item.
"""
def __init__(self, to_sort, key, attr='__value'):
self.to_sort = to_sort
self.key = key
@ -923,5 +927,6 @@ def main():
node.joinNetwork(known_nodes)
twisted.internet.reactor.run()
if __name__ == '__main__':
main()

26
lbrynet/dht/protocol.py
View file

@ -24,13 +24,13 @@ import msgtypes
import msgformat
from contact import Contact
reactor = twisted.internet.reactor
log = logging.getLogger(__name__)
class TimeoutError(Exception):
""" Raised when a RPC times out """
def __init__(self, remote_contact_id):
# remote_contact_id is a binary blob so we need to convert it
# into something more readable
@ -40,8 +40,8 @@ class TimeoutError(Exception):
class Delay(object):
maxToSendDelay = 10**-3 #0.05
minToSendDelay = 10**-5 #0.01
maxToSendDelay = 10 ** -3 # 0.05
minToSendDelay = 10 ** -5 # 0.01
def __init__(self, start=0):
self._next = start
@ -62,8 +62,7 @@ class Delay(object):
class KademliaProtocol(protocol.DatagramProtocol):
""" Implements all low-level network-related functions of a Kademlia node """
msgSizeLimit = constants.udpDatagramMaxSize-26
msgSizeLimit = constants.udpDatagramMaxSize - 26
def __init__(self, node, msgEncoder=encoding.Bencode(),
msgTranslator=msgformat.DefaultFormat()):
@ -115,7 +114,7 @@ class KademliaProtocol(protocol.DatagramProtocol):
# Set the RPC timeout timer
timeoutCall = reactor.callLater(
constants.rpcTimeout, self._msgTimeout, msg.id) #IGNORE:E1101
constants.rpcTimeout, self._msgTimeout, msg.id) # IGNORE:E1101
# Transmit the data
self._send(encodedMsg, msg.id, (contact.address, contact.port))
self._sentMessages[msg.id] = (contact.id, df, timeoutCall)
@ -182,7 +181,7 @@ class KademliaProtocol(protocol.DatagramProtocol):
else:
localModuleHierarchy = self.__module__.split('.')
remoteHierarchy = message.exceptionType.split('.')
#strip the remote hierarchy
# strip the remote hierarchy
while remoteHierarchy[0] == localModuleHierarchy[0]:
remoteHierarchy.pop(0)
localModuleHierarchy.pop(0)
@ -199,7 +198,7 @@ class KademliaProtocol(protocol.DatagramProtocol):
df.callback(message.response)
else:
# If the original message isn't found, it must have timed out
#TODO: we should probably do something with this...
# TODO: we should probably do something with this...
pass
def _send(self, data, rpcID, address):
@ -233,7 +232,7 @@ class KademliaProtocol(protocol.DatagramProtocol):
seqNumber = 0
startPos = 0
while seqNumber < totalPackets:
packetData = data[startPos:startPos+self.msgSizeLimit]
packetData = data[startPos:startPos + self.msgSizeLimit]
encSeqNumber = chr(seqNumber >> 8) + chr(seqNumber & 0xff)
txData = '\x00%s%s%s\x00%s' % (encTotalPackets, encSeqNumber, rpcID, packetData)
self._scheduleSendNext(txData, address)
@ -281,6 +280,7 @@ class KademliaProtocol(protocol.DatagramProtocol):
def _handleRPC(self, senderContact, rpcID, method, args):
""" Executes a local function in response to an RPC request """
# Set up the deferred callchain
def handleError(f):
self._sendError(senderContact, rpcID, f.type, f.getErrorMessage())
@ -359,7 +359,7 @@ class KademliaProtocol(protocol.DatagramProtocol):
log.debug('Attempted to cancel a DelayedCall that was not active')
except Exception:
log.exception('Failed to cancel a DelayedCall')
# not sure why this is needed, but taking this out sometimes causes
# exceptions.AttributeError: 'Port' object has no attribute 'socket'
# to happen on shutdown
# reactor.iterate()
# not sure why this is needed, but taking this out sometimes causes
# exceptions.AttributeError: 'Port' object has no attribute 'socket'
# to happen on shutdown
# reactor.iterate()

43
lbrynet/dht/routingtable.py
View file

@ -5,24 +5,28 @@
# The docstrings in this module contain epytext markup; API documentation
# may be created by processing this file with epydoc: http://epydoc.sf.net
import time, random
import time
import random
import constants
import kbucket
from protocol import TimeoutError
class RoutingTable(object):
""" Interface for RPC message translators/formatters
Classes inheriting from this should provide a suitable routing table for
a parent Node object (i.e. the local entity in the Kademlia network)
"""
def __init__(self, parentNodeID):
"""
@param parentNodeID: The n-bit node ID of the node to which this
routing table belongs
@type parentNodeID: str
"""
def addContact(self, contact):
""" Add the given contact to the correct k-bucket; if it already
exists, its status will be updated
@ -51,12 +55,14 @@ class RoutingTable(object):
node is returning all of the contacts that it knows of.
@rtype: list
"""
def getContact(self, contactID):
""" Returns the (known) contact with the specified node ID
@raise ValueError: No contact with the specified contact ID is known
by this node
"""
def getRefreshList(self, startIndex=0, force=False):
""" Finds all k-buckets that need refreshing, starting at the
k-bucket with the specified index, and returns IDs to be searched for
@ -78,6 +84,7 @@ class RoutingTable(object):
in order to refresh the routing Table
@rtype: list
"""
def removeContact(self, contactID):
""" Remove the contact with the specified node ID from the routing
table
@ -85,6 +92,7 @@ class RoutingTable(object):
@param contactID: The node ID of the contact to remove
@type contactID: str
"""
def touchKBucket(self, key):
""" Update the "last accessed" timestamp of the k-bucket which covers
the range containing the specified key in the key/ID space
@ -109,6 +117,7 @@ class TreeRoutingTable(RoutingTable):
C{PING} RPC-based k-bucket eviction algorithm described in section 2.2 of
that paper.
"""
def __init__(self, parentNodeID):
"""
@param parentNodeID: The n-bit node ID of the node to which this
@ -116,7 +125,7 @@ class TreeRoutingTable(RoutingTable):
@type parentNodeID: str
"""
# Create the initial (single) k-bucket covering the range of the entire n-bit ID space
self._buckets = [kbucket.KBucket(rangeMin=0, rangeMax=2**constants.key_bits)]
self._buckets = [kbucket.KBucket(rangeMin=0, rangeMax=2 ** constants.key_bits)]
self._parentNodeID = parentNodeID
def addContact(self, contact):
@ -204,21 +213,21 @@ class TreeRoutingTable(RoutingTable):
# with the specified key as node ID), unless there is less
# than k remote nodes in the routing table
i = 1
canGoLower = bucketIndex-i >= 0
canGoHigher = bucketIndex+i < len(self._buckets)
canGoLower = bucketIndex - i >= 0
canGoHigher = bucketIndex + i < len(self._buckets)
# Fill up the node list to k nodes, starting with the closest neighbouring nodes known
while len(closestNodes) < constants.k and (canGoLower or canGoHigher):
#TODO: this may need to be optimized
# TODO: this may need to be optimized
if canGoLower:
closestNodes.extend(
self._buckets[bucketIndex-i].getContacts(
self._buckets[bucketIndex - i].getContacts(
constants.k - len(closestNodes), _rpcNodeID))
canGoLower = bucketIndex-(i+1) >= 0
canGoLower = bucketIndex - (i + 1) >= 0
if canGoHigher:
closestNodes.extend(
self._buckets[bucketIndex+i].getContacts(
self._buckets[bucketIndex + i].getContacts(
constants.k - len(closestNodes), _rpcNodeID))
canGoHigher = bucketIndex+(i+1) < len(self._buckets)
canGoHigher = bucketIndex + (i + 1) < len(self._buckets)
i += 1
return closestNodes
@ -322,7 +331,7 @@ class TreeRoutingTable(RoutingTable):
if len(randomID) % 2 != 0:
randomID = '0' + randomID
randomID = randomID.decode('hex')
randomID = (constants.key_bits/8 - len(randomID))*'\x00' + randomID
randomID = (constants.key_bits / 8 - len(randomID)) * '\x00' + randomID
return randomID
def _splitBucket(self, oldBucketIndex):
@ -335,7 +344,7 @@ class TreeRoutingTable(RoutingTable):
"""
# Resize the range of the current (old) k-bucket
oldBucket = self._buckets[oldBucketIndex]
splitPoint = oldBucket.rangeMax - (oldBucket.rangeMax - oldBucket.rangeMin)/2
splitPoint = oldBucket.rangeMax - (oldBucket.rangeMax - oldBucket.rangeMin) / 2
# Create a new k-bucket to cover the range split off from the old bucket
newBucket = kbucket.KBucket(splitPoint, oldBucket.rangeMax)
oldBucket.rangeMax = splitPoint
@ -349,11 +358,13 @@ class TreeRoutingTable(RoutingTable):
for contact in newBucket._contacts:
oldBucket.removeContact(contact)
class OptimizedTreeRoutingTable(TreeRoutingTable):
""" A version of the "tree"-type routing table specified by Kademlia,
along with contact accounting optimizations specified in section 4.1 of
of the 13-page version of the Kademlia paper.
"""
def __init__(self, parentNodeID):
TreeRoutingTable.__init__(self, parentNodeID)
# Cache containing nodes eligible to replace stale k-bucket entries
@ -386,7 +397,7 @@ class OptimizedTreeRoutingTable(TreeRoutingTable):
# We can't split the k-bucket
# NOTE: This implementation follows section 4.1 of the 13 page version
# of the Kademlia paper (optimized contact accounting without PINGs
#- results in much less network traffic, at the expense of some memory)
# - results in much less network traffic, at the expense of some memory)
# Put the new contact in our replacement cache for the
# corresponding k-bucket (or update it's position if
@ -395,9 +406,9 @@ class OptimizedTreeRoutingTable(TreeRoutingTable):
self._replacementCache[bucketIndex] = []
if contact in self._replacementCache[bucketIndex]:
self._replacementCache[bucketIndex].remove(contact)
#TODO: Using k to limit the size of the contact
#replacement cache - maybe define a seperate value for
#this in constants.py?
# TODO: Using k to limit the size of the contact
# replacement cache - maybe define a seperate value for
# this in constants.py?
elif len(self._replacementCache) >= constants.k:
self._replacementCache.pop(0)
self._replacementCache[bucketIndex].append(contact)

3
lbrynet/lbrynet_daemon/DaemonControl.py
View file

@ -140,4 +140,7 @@ def start_server_and_listen(launchui, use_auth, analytics_manager, max_tries=5):
if __name__ == "__main__":
# import cProfile
# import time
# cProfile.run('start()', '/home/grin/code/lbry/lbry/daemonstats_' + time.strftime("%Y%m%d_%H%M%S"))
start()