PyBitmessage/src/knownnodes.py

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import pickle
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import os
import threading
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from bmconfigparser import BMConfigParser
import state
knownNodesLock = threading.Lock()
knownNodes = {}
knownNodesTrimAmount = 2000
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# forget a node after rating is this low
knownNodesForgetRating = -0.5
def saveKnownNodes(dirName = None):
if dirName is None:
dirName = state.appdata
with knownNodesLock:
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with open(os.path.join(dirName, 'knownnodes.dat'), 'wb') as output:
pickle.dump(knownNodes, output)
def increaseRating(peer):
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):
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):
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if len(knownNodes[recAddrStream]) < int(BMConfigParser().get("knownnodes", "maxnodes")):
return
with knownNodesLock:
oldestList = sorted(knownNodes[recAddrStream], key=lambda x: x['lastseen'])[:knownNodesTrimAmount]
for oldest in oldestList:
del knownNodes[recAddrStream][oldest]