Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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"""
Manipulations with knownNodes dictionary.
"""
import json
import logging
import os
import pickle
import threading
import time
import state
from bmconfigparser import BMConfigParser
from network.node import Peer
knownNodesLock = threading.Lock()
"""Thread lock for knownnodes modification"""
knownNodes = {stream: {} for stream in range(1, 4)}
"""The dict of known nodes for each stream"""
knownNodesTrimAmount = 2000
"""trim stream knownnodes dict to this length"""
knownNodesForgetRating = -0.5
"""forget a node after rating is this low"""
knownNodesActual = False
logger = logging.getLogger('default')
DEFAULT_NODES = (
Peer('5.45.99.75', 8444),
Peer('75.167.159.54', 8444),
Peer('95.165.168.168', 8444),
Peer('85.180.139.241', 8444),
Peer('158.222.217.190', 8080),
Peer('178.62.12.187', 8448),
Peer('24.188.198.204', 8111),
Peer('109.147.204.113', 1195),
Peer('178.11.46.221', 8444)
)
def json_serialize_knownnodes(output):
"""
Reorganize knownnodes dict and write it as JSON to output
"""
_serialized = []
for stream, peers in knownNodes.iteritems():
for peer, info in peers.iteritems():
info.update(rating=round(info.get('rating', 0), 2))
_serialized.append({
'stream': stream, 'peer': peer._asdict(), 'info': info
})
json.dump(_serialized, output, indent=4)
def json_deserialize_knownnodes(source):
"""
Read JSON from source and make knownnodes dict
"""
global knownNodesActual # pylint: disable=global-statement
for node in json.load(source):
peer = node['peer']
info = node['info']
peer = Peer(str(peer['host']), peer.get('port', 8444))
knownNodes[node['stream']][peer] = info
if not (knownNodesActual
or info.get('self')) and peer not in DEFAULT_NODES:
knownNodesActual = True
def pickle_deserialize_old_knownnodes(source):
"""
Unpickle source and reorganize knownnodes dict if it has old format
the old format was {Peer:lastseen, ...}
the new format is {Peer:{"lastseen":i, "rating":f}}
"""
global knownNodes # pylint: disable=global-statement
knownNodes = pickle.load(source)
for stream in knownNodes.keys():
for node, params in knownNodes[stream].iteritems():
if isinstance(params, (float, int)):
addKnownNode(stream, node, params)
def saveKnownNodes(dirName=None):
"""Save knownnodes to filesystem"""
if dirName is None:
dirName = state.appdata
with knownNodesLock:
with open(os.path.join(dirName, 'knownnodes.dat'), 'wb') as output:
json_serialize_knownnodes(output)
def addKnownNode(stream, peer, lastseen=None, is_self=False):
"""Add a new node to the dict"""
knownNodes[stream][peer] = {
"lastseen": lastseen or time.time(),
"rating": 1 if is_self else 0,
"self": is_self,
}
def createDefaultKnownNodes():
"""Creating default Knownnodes"""
past = time.time() - 2418600 # 28 days - 10 min
for peer in DEFAULT_NODES:
addKnownNode(1, peer, past)
saveKnownNodes()
def readKnownNodes():
"""Load knownnodes from filesystem"""
try:
with open(state.appdata + 'knownnodes.dat', 'rb') as source:
with knownNodesLock:
try:
json_deserialize_knownnodes(source)
except ValueError:
source.seek(0)
pickle_deserialize_old_knownnodes(source)
except (IOError, OSError, KeyError, EOFError):
logger.debug(
'Failed to read nodes from knownnodes.dat', exc_info=True)
createDefaultKnownNodes()
config = BMConfigParser()
# your own onion address, if setup
onionhostname = config.safeGet('bitmessagesettings', 'onionhostname')
if onionhostname and ".onion" in onionhostname:
onionport = config.safeGetInt('bitmessagesettings', 'onionport')
if onionport:
self_peer = Peer(onionhostname, onionport)
addKnownNode(1, self_peer, is_self=True)
state.ownAddresses[self_peer] = True
def increaseRating(peer):
"""Increase rating of a peer node"""
increaseAmount = 0.1
maxRating = 1
with knownNodesLock:
for stream in knownNodes.keys():
try:
knownNodes[stream][peer]["rating"] = min(
knownNodes[stream][peer]["rating"] + increaseAmount,
maxRating
)
except KeyError:
pass
def decreaseRating(peer):
"""Decrease rating of a peer node"""
decreaseAmount = 0.1
minRating = -1
with knownNodesLock:
for stream in knownNodes.keys():
try:
knownNodes[stream][peer]["rating"] = max(
knownNodes[stream][peer]["rating"] - decreaseAmount,
minRating
)
except KeyError:
pass
def trimKnownNodes(recAddrStream=1):
"""Triming Knownnodes"""
if len(knownNodes[recAddrStream]) < \
BMConfigParser().safeGetInt("knownnodes", "maxnodes"):
return
with knownNodesLock:
oldestList = sorted(
knownNodes[recAddrStream],
key=lambda x: x['lastseen']
)[:knownNodesTrimAmount]
for oldest in oldestList:
del knownNodes[recAddrStream][oldest]
def dns():
"""Add DNS names to knownnodes"""
for port in [8080, 8444]:
addKnownNode(
1, Peer('bootstrap%s.bitmessage.org' % port, port))
def cleanupKnownNodes():
"""
Cleanup knownnodes: remove old nodes and nodes with low rating
"""
now = int(time.time())
needToWriteKnownNodesToDisk = False
with knownNodesLock:
for stream in knownNodes:
if stream not in state.streamsInWhichIAmParticipating:
continue
keys = knownNodes[stream].keys()
for node in keys:
if len(knownNodes[stream]) <= 1: # leave at least one node
break
try:
age = now - knownNodes[stream][node]["lastseen"]
# scrap old nodes (age > 28 days)
if age > 2419200:
needToWriteKnownNodesToDisk = True
del knownNodes[stream][node]
continue
# scrap old nodes (age > 3 hours) with low rating
if (age > 10800 and knownNodes[stream][node]["rating"]
<= knownNodesForgetRating):
needToWriteKnownNodesToDisk = True
del knownNodes[stream][node]
continue
except TypeError:
logger.warning('Error in %s', node)
keys = []
# Let us write out the knowNodes to disk
# if there is anything new to write out.
if needToWriteKnownNodesToDisk:
saveKnownNodes()