PyBitmessage/src/network/connectionchooser.py

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from queues import Queue
import random
from bmconfigparser import BMConfigParser
import knownnodes
import protocol
from queues import portCheckerQueue
import state
import helper_random
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def getDiscoveredPeer():
try:
peer = helper_random.randomchoice(state.discoveredPeers.keys())
except (IndexError, KeyError):
raise ValueError
try:
del state.discoveredPeers[peer]
except KeyError:
pass
return peer
def chooseConnection(stream):
haveOnion = BMConfigParser().safeGet("bitmessagesettings", "socksproxytype")[0:5] == 'SOCKS'
if state.trustedPeer:
return state.trustedPeer
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try:
retval = portCheckerQueue.get(False)
portCheckerQueue.task_done()
return retval
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except Queue.Empty:
pass
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# with a probability of 0.5, connect to a discovered peer
if helper_random.randomchoice((False, True)) and not haveOnion:
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# discovered peers are already filtered by allowed streams
return getDiscoveredPeer()
for _ in range(50):
peer = helper_random.randomchoice(knownnodes.knownNodes[stream].keys())
try:
rating = knownnodes.knownNodes[stream][peer]["rating"]
except TypeError:
print "Error in %s" % (peer)
rating = 0
if haveOnion:
# onion addresses have a higher priority when SOCKS
if peer.host.endswith('.onion') and rating > 0:
rating = 1
else:
encodedAddr = protocol.encodeHost(peer.host)
# don't connect to local IPs when using SOCKS
if not protocol.checkIPAddress(encodedAddr, False):
continue
if rating > 1:
rating = 1
try:
if 0.05/(1.0-rating) > random.random():
return peer
except ZeroDivisionError:
return peer
raise ValueError