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PyBitmessage
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Improved stream handling

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- version command sends list of all participating streams
- biginv sends lists of hosts for all streams the peer wants (plus
  immediate children)
- objects will spread to all peers that advertise the associated stream
- please note these are just network subsystem adjustments, streams
  aren't actually usable yet
master
Peter Šurda 7 years ago
parent 79b566a907
commit f6bdad18a3
Signed by untrusted user: PeterSurda
GPG Key ID: 0C5F50C0B5F37D87
5 changed files with 147 additions and 123 deletions
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2
src/bitmessagemain.py
Unescape Escape View File

@ -51,7 +51,7 @@ import helper_generic
from helper_threading import *
def connectToStream(streamNumber):
state.streamsInWhichIAmParticipating[streamNumber] = 'no data'
state.streamsInWhichIAmParticipating.append(streamNumber)
selfInitiatedConnections[streamNumber] = {}
if isOurOperatingSystemLimitedToHavingVeryFewHalfOpenConnections():

237
src/class_receiveDataThread.py
Unescape Escape View File

@ -62,7 +62,8 @@ class receiveDataThread(threading.Thread):
self.sock = sock
self.peer = state.Peer(HOST, port)
self.name = "receiveData-" + self.peer.host.replace(":", ".") # ":" log parser field separator
self.streamNumber = streamNumber
self.streamNumber = state.streamsInWhichIAmParticipating
self.remoteStreams = []
self.selfInitiatedConnections = selfInitiatedConnections
self.sendDataThreadQueue = sendDataThreadQueue # used to send commands and data to the sendDataThread
self.hostIdent = self.peer.port if ".onion" in BMConfigParser().get('bitmessagesettings', 'onionhostname') and protocol.checkSocksIP(self.peer.host) else self.peer.host
@ -70,7 +71,7 @@ class receiveDataThread(threading.Thread):
self.hostIdent] = 0 # The very fact that this receiveData thread exists shows that we are connected to the remote host. Let's add it to this list so that an outgoingSynSender thread doesn't try to connect to it.
self.connectionIsOrWasFullyEstablished = False # set to true after the remote node and I accept each other's version messages. This is needed to allow the user interface to accurately reflect the current number of connections.
self.services = 0
if self.streamNumber == -1: # This was an incoming connection. Send out a version message if we accept the other node's version message.
if streamNumber == -1: # This was an incoming connection. Send out a version message if we accept the other node's version message.
self.initiatedConnection = False
else:
self.initiatedConnection = True
@ -120,7 +121,11 @@ class receiveDataThread(threading.Thread):
self.processData()
try:
del self.selfInitiatedConnections[self.streamNumber][self]
for stream in self.remoteStreams:
try:
del self.selfInitiatedConnections[stream][self]
except KeyError:
pass
logger.debug('removed self (a receiveDataThread) from selfInitiatedConnections')
except:
pass
@ -137,7 +142,8 @@ class receiveDataThread(threading.Thread):
def antiIntersectionDelay(self, initial = False):
# estimated time for a small object to propagate across the whole network
delay = math.ceil(math.log(len(shared.knownNodes[self.streamNumber]) + 2, 20)) * (0.2 + objectHashHolder.size/2)
delay = math.ceil(math.log(max(len(shared.knownNodes[x]) for x in shared.knownNodes) + 2, 20)) * (0.2 + objectHashHolder.size/2)
# take the stream with maximum amount of nodes
# +2 is to avoid problems with log(0) and log(1)
# 20 is avg connected nodes count
# 0.2 is avg message transmission time
@ -182,7 +188,8 @@ class receiveDataThread(threading.Thread):
# that other peers can be made aware of its existance.
if self.initiatedConnection and self.connectionIsOrWasFullyEstablished: # The remote port is only something we should share with others if it is the remote node's incoming port (rather than some random operating-system-assigned outgoing port).
with shared.knownNodesLock:
shared.knownNodes[self.streamNumber][self.peer] = int(time.time())
for stream in self.streamNumber:
shared.knownNodes[stream][self.peer] = int(time.time())
#Strip the nulls
command = command.rstrip('\x00')
@ -313,9 +320,10 @@ class receiveDataThread(threading.Thread):
PendingUpload().add()
# Let all of our peers know about this new node.
dataToSend = (int(time.time()), self.streamNumber, 1, self.peer.host, self.remoteNodeIncomingPort)
protocol.broadcastToSendDataQueues((
self.streamNumber, 'advertisepeer', dataToSend))
for stream in self.remoteStreams:
dataToSend = (int(time.time()), stream, self.services, self.peer.host, self.remoteNodeIncomingPort)
protocol.broadcastToSendDataQueues((
stream, 'advertisepeer', dataToSend))
self.sendaddr() # This is one large addr message to this one peer.
if not self.initiatedConnection and len(shared.connectedHostsList) > 200:
@ -328,9 +336,10 @@ class receiveDataThread(threading.Thread):
def sendBigInv(self):
# Select all hashes for objects in this stream.
bigInvList = {}
for hash in Inventory().unexpired_hashes_by_stream(self.streamNumber):
if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware and not self.objectHashHolderInstance.hasHash(hash):
bigInvList[hash] = 0
for stream in self.streamNumber:
for hash in Inventory().unexpired_hashes_by_stream(stream):
if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware and not self.objectHashHolderInstance.hasHash(hash):
bigInvList[hash] = 0
numberOfObjectsInInvMessage = 0
payload = ''
# Now let us start appending all of these hashes together. They will be
@ -426,7 +435,9 @@ class receiveDataThread(threading.Thread):
advertisedSet = set()
for i in range(numberOfItemsInInv):
advertisedSet.add(data[lengthOfVarint + (32 * i):32 + lengthOfVarint + (32 * i)])
objectsNewToMe = advertisedSet - Inventory().hashes_by_stream(self.streamNumber)
objectsNewToMe = advertisedSet
for stream in self.streamNumber:
objectsNewToMe -= Inventory().hashes_by_stream(stream)
logger.info('inv message lists %s objects. Of those %s are new to me. It took %s seconds to figure that out.', numberOfItemsInInv, len(objectsNewToMe), time.time()-startTime)
for item in objectsNewToMe:
PendingDownload().add(item)
@ -532,7 +543,7 @@ class receiveDataThread(threading.Thread):
38 * i):12 + lengthOfNumberOfAddresses + (38 * i)])
if recaddrStream == 0:
continue
if recaddrStream != self.streamNumber and recaddrStream != (self.streamNumber * 2) and recaddrStream != ((self.streamNumber * 2) + 1): # if the embedded stream number is not in my stream or either of my child streams then ignore it. Someone might be trying funny business.
if recaddrStream not in self.streamNumber and (recaddrStream / 2) not in self.streamNumber: # if the embedded stream number and its parent are not in my streams then ignore it. Someone might be trying funny business.
continue
recaddrServices, = unpack('>Q', data[12 + lengthOfNumberOfAddresses + (
38 * i):20 + lengthOfNumberOfAddresses + (38 * i)])
@ -560,7 +571,7 @@ class receiveDataThread(threading.Thread):
timeSomeoneElseReceivedMessageFromThisNode,
recaddrStream, recaddrServices, hostStandardFormat, recaddrPort)
protocol.broadcastToSendDataQueues((
self.streamNumber, 'advertisepeer', hostDetails))
self.recaddrStream, 'advertisepeer', hostDetails))
else:
timeLastReceivedMessageFromThisNode = shared.knownNodes[recaddrStream][
peerFromAddrMessage]
@ -568,7 +579,8 @@ class receiveDataThread(threading.Thread):
with shared.knownNodesLock:
shared.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode
logger.debug('knownNodes currently has ' + str(len(shared.knownNodes[self.streamNumber])) + ' nodes for this stream.')
for stream in self.streamNumber:
logger.debug('knownNodes currently has %i nodes for stream %i', len(shared.knownNodes[stream]), stream)
# Send a huge addr message to our peer. This is only used
@ -576,87 +588,87 @@ class receiveDataThread(threading.Thread):
# peer (with the full exchange of version and verack
# messages).
def sendaddr(self):
addrsInMyStream = {}
addrsInChildStreamLeft = {}
addrsInChildStreamRight = {}
# print 'knownNodes', shared.knownNodes
# We are going to share a maximum number of 1000 addrs with our peer.
# 500 from this stream, 250 from the left child stream, and 250 from
# the right child stream.
with shared.knownNodesLock:
if len(shared.knownNodes[self.streamNumber]) > 0:
ownPosition = random.randint(0, 499)
sentOwn = False
for i in range(500):
# if current connection is over a proxy, sent our own onion address at a random position
if ownPosition == i and ".onion" in BMConfigParser().get("bitmessagesettings", "onionhostname") and \
hasattr(self.sock, "getproxytype") and self.sock.getproxytype() != "none" and not sentOwn:
peer = state.Peer(BMConfigParser().get("bitmessagesettings", "onionhostname"), BMConfigParser().getint("bitmessagesettings", "onionport"))
else:
# still may contain own onion address, but we don't change it
peer, = random.sample(shared.knownNodes[self.streamNumber], 1)
if isHostInPrivateIPRange(peer.host):
continue
if peer.host == BMConfigParser().get("bitmessagesettings", "onionhostname") and peer.port == BMConfigParser().getint("bitmessagesettings", "onionport") :
sentOwn = True
addrsInMyStream[peer] = shared.knownNodes[
self.streamNumber][peer]
if len(shared.knownNodes[self.streamNumber * 2]) > 0:
for i in range(250):
peer, = random.sample(shared.knownNodes[
self.streamNumber * 2], 1)
if isHostInPrivateIPRange(peer.host):
continue
addrsInChildStreamLeft[peer] = shared.knownNodes[
self.streamNumber * 2][peer]
if len(shared.knownNodes[(self.streamNumber * 2) + 1]) > 0:
for i in range(250):
peer, = random.sample(shared.knownNodes[
(self.streamNumber * 2) + 1], 1)
if isHostInPrivateIPRange(peer.host):
continue
addrsInChildStreamRight[peer] = shared.knownNodes[
(self.streamNumber * 2) + 1][peer]
numberOfAddressesInAddrMessage = 0
payload = ''
# print 'addrsInMyStream.items()', addrsInMyStream.items()
for (HOST, PORT), value in addrsInMyStream.items():
timeLastReceivedMessageFromThisNode = value
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
numberOfAddressesInAddrMessage += 1
payload += pack(
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
payload += pack('>I', self.streamNumber)
payload += pack(
'>q', 1) # service bit flags offered by this node
payload += protocol.encodeHost(HOST)
payload += pack('>H', PORT) # remote port
for (HOST, PORT), value in addrsInChildStreamLeft.items():
timeLastReceivedMessageFromThisNode = value
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
numberOfAddressesInAddrMessage += 1
payload += pack(
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
payload += pack('>I', self.streamNumber * 2)
payload += pack(
'>q', 1) # service bit flags offered by this node
payload += protocol.encodeHost(HOST)
payload += pack('>H', PORT) # remote port
for (HOST, PORT), value in addrsInChildStreamRight.items():
timeLastReceivedMessageFromThisNode = value
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
numberOfAddressesInAddrMessage += 1
payload += pack(
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
payload += pack('>I', (self.streamNumber * 2) + 1)
payload += pack(
'>q', 1) # service bit flags offered by this node
payload += protocol.encodeHost(HOST)
payload += pack('>H', PORT) # remote port
payload = encodeVarint(numberOfAddressesInAddrMessage) + payload
self.sendDataThreadQueue.put((0, 'sendRawData', protocol.CreatePacket('addr', payload)))
# We are going to share a maximum number of 1000 addrs (per overlapping
# stream) with our peer. 500 from overlapping streams, 250 from the
# left child stream, and 250 from the right child stream.
for stream in self.streamNumber:
addrsInMyStream = {}
addrsInChildStreamLeft = {}
addrsInChildStreamRight = {}
with shared.knownNodesLock:
if len(shared.knownNodes[stream]) > 0:
ownPosition = random.randint(0, 499)
sentOwn = False
for i in range(500):
# if current connection is over a proxy, sent our own onion address at a random position
if ownPosition == i and ".onion" in BMConfigParser().get("bitmessagesettings", "onionhostname") and \
hasattr(self.sock, "getproxytype") and self.sock.getproxytype() != "none" and not sentOwn:
peer = state.Peer(BMConfigParser().get("bitmessagesettings", "onionhostname"), BMConfigParser().getint("bitmessagesettings", "onionport"))
else:
# still may contain own onion address, but we don't change it
peer, = random.sample(shared.knownNodes[stream], 1)
if isHostInPrivateIPRange(peer.host):
continue
if peer.host == BMConfigParser().get("bitmessagesettings", "onionhostname") and peer.port == BMConfigParser().getint("bitmessagesettings", "onionport") :
sentOwn = True
addrsInMyStream[peer] = shared.knownNodes[
stream][peer]
# sent 250 only if the remote isn't interested in it
if len(shared.knownNodes[stream * 2]) > 0 and stream not in self.streamNumber:
for i in range(250):
peer, = random.sample(shared.knownNodes[
stream * 2], 1)
if isHostInPrivateIPRange(peer.host):
continue
addrsInChildStreamLeft[peer] = shared.knownNodes[
stream * 2][peer]
if len(shared.knownNodes[(stream * 2) + 1]) > 0 and stream not in self.streamNumber:
for i in range(250):
peer, = random.sample(shared.knownNodes[
(stream * 2) + 1], 1)
if isHostInPrivateIPRange(peer.host):
continue
addrsInChildStreamRight[peer] = shared.knownNodes[
(stream * 2) + 1][peer]
numberOfAddressesInAddrMessage = 0
payload = ''
for (HOST, PORT), value in addrsInMyStream.items():
timeLastReceivedMessageFromThisNode = value
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
numberOfAddressesInAddrMessage += 1
payload += pack(
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
payload += pack('>I', stream)
payload += pack(
'>q', 1) # service bit flags offered by this node
payload += protocol.encodeHost(HOST)
payload += pack('>H', PORT) # remote port
for (HOST, PORT), value in addrsInChildStreamLeft.items():
timeLastReceivedMessageFromThisNode = value
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
numberOfAddressesInAddrMessage += 1
payload += pack(
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
payload += pack('>I', stream * 2)
payload += pack(
'>q', 1) # service bit flags offered by this node
payload += protocol.encodeHost(HOST)
payload += pack('>H', PORT) # remote port
for (HOST, PORT), value in addrsInChildStreamRight.items():
timeLastReceivedMessageFromThisNode = value
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
numberOfAddressesInAddrMessage += 1
payload += pack(
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
payload += pack('>I', (stream * 2) + 1)
payload += pack(
'>q', 1) # service bit flags offered by this node
payload += protocol.encodeHost(HOST)
payload += pack('>H', PORT) # remote port
payload = encodeVarint(numberOfAddressesInAddrMessage) + payload
self.sendDataThreadQueue.put((0, 'sendRawData', protocol.CreatePacket('addr', payload)))
# We have received a version message
@ -732,20 +744,24 @@ class receiveDataThread(threading.Thread):
numberOfStreamsInVersionMessage, lengthOfNumberOfStreamsInVersionMessage = decodeVarint(
data[readPosition:])
readPosition += lengthOfNumberOfStreamsInVersionMessage
self.streamNumber, lengthOfRemoteStreamNumber = decodeVarint(
data[readPosition:])
logger.debug('Remote node useragent: ' + useragent + ' stream number:' + str(self.streamNumber) + ' time offset: ' + str(timeOffset) + ' seconds.')
self.remoteStreams = []
for i in range(numberOfStreamsInVersionMessage):
newStreamNumber, lengthOfRemoteStreamNumber = decodeVarint(data[readPosition:])
readPosition += lengthOfRemoteStreamNumber
self.remoteStreams.append(newStreamNumber)
logger.debug('Remote node useragent: %s, streams: (%s), time offset: %is.', useragent, ', '.join(str(x) for x in self.remoteStreams), timeOffset)
# find shared streams
self.streamNumber = sorted(set(state.streamsInWhichIAmParticipating).intersection(self.remoteStreams))
if self.streamNumber != 1:
if len(self.streamNumber) == 0:
self.sendDataThreadQueue.put((0, 'shutdown','no data'))
logger.debug ('Closed connection to ' + str(self.peer) + ' because they are interested in stream ' + str(self.streamNumber) + '.')
logger.debug ('Closed connection to ' + str(self.peer) + ' because there is no overlapping interest in streams.')
return
shared.connectedHostsList[
self.hostIdent] = 1 # We use this data structure to not only keep track of what hosts we are connected to so that we don't try to connect to them again, but also to list the connections count on the Network Status tab.
# If this was an incoming connection, then the sendDataThread
# doesn't know the stream. We have to set it.
if not self.initiatedConnection:
self.sendDataThreadQueue.put((0, 'setStreamNumber', self.streamNumber))
self.sendDataThreadQueue.put((0, 'setStreamNumber', self.remoteStreams))
if data[72:80] == protocol.eightBytesOfRandomDataUsedToDetectConnectionsToSelf:
self.sendDataThreadQueue.put((0, 'shutdown','no data'))
logger.debug('Closing connection to myself: ' + str(self.peer))
@ -757,10 +773,11 @@ class receiveDataThread(threading.Thread):
if not isHostInPrivateIPRange(self.peer.host):
with shared.knownNodesLock:
shared.knownNodes[self.streamNumber][state.Peer(self.peer.host, self.remoteNodeIncomingPort)] = int(time.time())
if not self.initiatedConnection:
shared.knownNodes[self.streamNumber][state.Peer(self.peer.host, self.remoteNodeIncomingPort)] -= 162000 # penalise inbound, 2 days minus 3 hours
shared.needToWriteKnownNodesToDisk = True
for stream in self.remoteStreams:
shared.knownNodes[stream][state.Peer(self.peer.host, self.remoteNodeIncomingPort)] = int(time.time())
if not self.initiatedConnection:
shared.knownNodes[stream][state.Peer(self.peer.host, self.remoteNodeIncomingPort)] -= 162000 # penalise inbound, 2 days minus 3 hours
shared.needToWriteKnownNodesToDisk = True
self.sendverack()
if self.initiatedConnection == False:
@ -770,7 +787,7 @@ class receiveDataThread(threading.Thread):
def sendversion(self):
logger.debug('Sending version message')
self.sendDataThreadQueue.put((0, 'sendRawData', protocol.assembleVersionMessage(
self.peer.host, self.peer.port, self.streamNumber, not self.initiatedConnection)))
self.peer.host, self.peer.port, state.streamsInWhichIAmParticipating, not self.initiatedConnection)))
# Sends a verack message

14
src/class_sendDataThread.py
Unescape Escape View File

@ -42,7 +42,7 @@ class sendDataThread(threading.Thread):
self.sock = sock
self.peer = state.Peer(HOST, PORT)
self.name = "sendData-" + self.peer.host.replace(":", ".") # log parser field separator
self.streamNumber = streamNumber
self.streamNumber = []
self.services = 0
self.buffer = ""
self.initiatedConnection = False
@ -51,16 +51,16 @@ class sendDataThread(threading.Thread):
self.lastTimeISentData = int(
time.time()) # If this value increases beyond five minutes ago, we'll send a pong message to keep the connection alive.
self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware = someObjectsOfWhichThisRemoteNodeIsAlreadyAware
if self.streamNumber == -1: # This was an incoming connection.
if streamNumber == -1: # This was an incoming connection.
self.initiatedConnection = False
else:
self.initiatedConnection = True
logger.debug('The streamNumber of this sendDataThread (ID: ' + str(id(self)) + ') at setup() is' + str(self.streamNumber))
#logger.debug('The streamNumber of this sendDataThread (ID: ' + str(id(self)) + ') at setup() is' + str(self.streamNumber))
def sendVersionMessage(self):
datatosend = protocol.assembleVersionMessage(
self.peer.host, self.peer.port, self.streamNumber, not self.initiatedConnection) # the IP and port of the remote host, and my streamNumber.
self.peer.host, self.peer.port, state.streamsInWhichIAmParticipating, not self.initiatedConnection) # the IP and port of the remote host, and my streamNumber.
logger.debug('Sending version packet: ' + repr(datatosend))
@ -102,7 +102,7 @@ class sendDataThread(threading.Thread):
self.sendBytes()
deststream, command, data = self.sendDataThreadQueue.get()
if deststream == self.streamNumber or deststream == 0:
if deststream == 0 or deststream in self.streamNumber:
if command == 'shutdown':
logger.debug('sendDataThread (associated with ' + str(self.peer) + ') ID: ' + str(id(self)) + ' shutting down now.')
break
@ -114,7 +114,7 @@ class sendDataThread(threading.Thread):
# streamNumber of this send data thread here:
elif command == 'setStreamNumber':
self.streamNumber = data
logger.debug('setting the stream number in the sendData thread (ID: ' + str(id(self)) + ') to ' + str(self.streamNumber))
logger.debug('setting the stream number to %s', ', '.join(str(x) for x in self.streamNumber))
elif command == 'setRemoteProtocolVersion':
specifiedRemoteProtocolVersion = data
logger.debug('setting the remote node\'s protocol version in the sendDataThread (ID: ' + str(id(self)) + ') to ' + str(specifiedRemoteProtocolVersion))
@ -183,7 +183,7 @@ class sendDataThread(threading.Thread):
self.connectionIsOrWasFullyEstablished = True
self.services, self.sslSock = data
elif self.connectionIsOrWasFullyEstablished:
logger.error('sendDataThread ID: ' + str(id(self)) + ' ignoring command ' + command + ' because the thread is not in stream ' + str(deststream))
logger.error('sendDataThread ID: ' + str(id(self)) + ' ignoring command ' + command + ' because the thread is not in stream ' + str(deststream) + ' but in streams ' + ', '.join(str(x) for x in self.streamNumber))
self.sendDataThreadQueue.task_done()
self.sendDataThreadQueue.task_done()

15
src/protocol.py
Unescape Escape View File

@ -119,7 +119,7 @@ def CreatePacket(command, payload=''):
b[Header.size:] = payload
return bytes(b)
def assembleVersionMessage(remoteHost, remotePort, myStreamNumber, server = False):
def assembleVersionMessage(remoteHost, remotePort, participatingStreams, server = False):
payload = ''
payload += pack('>L', 3) # protocol version.
payload += pack('>q', NODE_NETWORK|(NODE_SSL if haveSSL(server) else 0)) # bitflags of the services I offer.
@ -154,9 +154,16 @@ def assembleVersionMessage(remoteHost, remotePort, myStreamNumber, server = Fals
userAgent = '/PyBitmessage:' + softwareVersion + '/'
payload += encodeVarint(len(userAgent))
payload += userAgent
payload += encodeVarint(
1) # The number of streams about which I care. PyBitmessage currently only supports 1 per connection.
payload += encodeVarint(myStreamNumber)
# Streams
payload += encodeVarint(len(participatingStreams))
count = 0
for stream in sorted(participatingStreams):
payload += encodeVarint(stream)
count += 1
# protocol limit, see specification
if count >= 160000:
break
return CreatePacket('version', payload)

2
src/state.py
Unescape Escape View File

@ -1,7 +1,7 @@
import collections
neededPubkeys = {}
streamsInWhichIAmParticipating = {}
streamsInWhichIAmParticipating = []
sendDataQueues = [] #each sendData thread puts its queue in this list.
# For UPnP

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