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iotSocketSession.py
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iotSocketSession.py
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"""
The MIT License (MIT)
Copyright © 2018 Jean-Christophe Bos & HC² (www.hc2.fr)
"""
from iotSocketStruct import IoTSocketStruct
from XAsyncSockets import XClosedReason
from struct import unpack
from secrets import token_bytes
from _thread import allocate_lock
from time import time
class IoTSocketSession :
IOTSOCKET_VER = 0x01
RECV_TIMEOUT = 10
def __init__(self, xAsyncTCPClient, router, sslContext, reqTimeout) :
self._xasTCPCli = xAsyncTCPClient
self._router = router
self._sslContext = sslContext
self._reqTimeout = reqTimeout
self._uid = None
self._telemetryToken = None
self._authenticated = False
self._isCentral = False
self._strUID = None
self._groupID = None
self._closedCode = None
self._requests = { }
self._requestsLock = allocate_lock()
self._xasTCPCli.OnClosed = self._onTCPConnClosed
self._waitInitiationReq()
def Close(self) :
self._xasTCPCli.Close()
def Send(self, data, onDataSent=None, onDataSentArg=None) :
return self._xasTCPCli.AsyncSendData(data, onDataSent, onDataSentArg)
def _recv(self, size, onDataRecv, onDataRecvArg=None) :
self._xasTCPCli.AsyncRecvData(size, onDataRecv, onDataRecvArg, self.RECV_TIMEOUT)
def _onTCPConnClosed(self, xAsyncTCPClient, closedReason) :
reason = {
XClosedReason.ClosedByHost : 'BY HOST',
XClosedReason.ClosedByPeer : 'BY PEER',
XClosedReason.Timeout : 'AFTER TIMEOUT'
}.get(closedReason, '(ERROR)')
if self._authenticated :
keepSessionData = self._closedCode in [ None,
IoTSocketStruct.CLOSE_CODE_SLEEP_MODE,
IoTSocketStruct.CLOSE_CODE_FLUSH_RESS ]
self._router.RemoveSession(self, keepSessionData)
self._router.Log( 'SESSION %s CLOSED %s' %
(self._getSessionName(), reason) )
else :
self._router.Log( 'CONNECTION %s REFUSED (%s)' %
(self._xasTCPCli.CliAddr[0], reason) )
def _waitInitiationReq(self) :
self._recv(4, self._onInitiationReqRecv)
def _onInitiationReqRecv(self, xAsyncTCPClient, data, arg) :
tls, ver, opt, maxTrLen = IoTSocketStruct.DecodeInitiationReq(data)
ok = ( ver == self.IOTSOCKET_VER and
( not tls or self._sslContext is not None ) )
data = IoTSocketStruct.MakeInitiationResp( ok = ok,
ruleType = IoTSocketStruct.INIT_NO_RULE )
if ok :
self.Send(data, self._onInitiationRespSent, tls)
else :
self.Send(data)
self.Close()
def _onInitiationRespSent(self, xAsyncTCPClient, arg) :
if arg :
try :
self._xasTCPCli.StartSSLContext(self._sslContext, True)
except :
self.Close()
return
self._token128 = token_bytes(16)
self.Send(self._token128)
self._recv(48, self._onChallengeRecv)
def _onChallengeRecv(self, xAsyncTCPClient, data, arg) :
self._uid = data[:16].tobytes()
hmac256 = data[16:].tobytes()
if self._router.AuthenticateSession( self,
self._token128,
hmac256 ) :
self._startSession()
else :
self.Close()
def _startSession(self) :
self._authenticated = True
self._isCentral = (self._uid == IoTSocketStruct.CENTRAL_EMPTY_UID)
if not self._isCentral :
self._strUID = IoTSocketStruct.UIDFromBin128(self._uid)
self._router.Log( 'SESSION %s STARTED FROM %s' %
(self._getSessionName(), self._xasTCPCli.CliAddr[0]) )
if not self._isCentral :
self._groupID = self._router.GetACLAccess(self._uid)[0]
if self._router.GetGroupOption(self._groupID, 'Telemetry') :
expMin = self._router.GetGroupOption(self._groupID, 'TelemetryTokenExpMin')
self._telemetryToken = self._router.GetNewTelemetryToken(self._uid, expMin)
tr = IoTSocketStruct.MakeTelemetryTokenTR(self._telemetryToken)
self.Send(tr)
self._waitDataTransmission()
def _waitDataTransmission(self) :
self._xasTCPCli.AsyncRecvData(1, self._onDataTransmissionRecv)
def _onDataTransmissionRecv(self, xAsyncTCPClient, data, arg) :
if arg :
tot = arg
uid = data.tobytes()
else :
tot, rte = IoTSocketStruct.DecodeDataTRHdr(data)
if rte :
self._recv(16, self._onDataTransmissionRecv, tot)
return
uid = None
if tot == IoTSocketStruct.TOT_ACL and self._isCentral :
self._recv(4, self._onACLItemsCountRecv)
elif tot == IoTSocketStruct.TOT_PING :
self._router.Log('SESSION %s > PING RECEIVED' % self._getSessionName())
self.Send(IoTSocketStruct.MakePongTR())
self._waitDataTransmission()
elif tot == IoTSocketStruct.TOT_PONG :
self._router.Log('SESSION %s > PONG RECEIVED' % self._getSessionName())
self._waitDataTransmission()
elif tot == IoTSocketStruct.TOT_REQUEST :
self._recv(5, self._onRequestRecv, (uid, ))
elif tot == IoTSocketStruct.TOT_RESPONSE :
self._recv(6, self._onResponseRecv, (uid, ))
elif tot == IoTSocketStruct.TOT_CLOSE_CONN :
self._recv(1, self._onCloseConnCodeRecv)
else :
self.Send(IoTSocketStruct.MakeCloseConnTR(IoTSocketStruct.CLOSE_CODE_PROTO_ERR))
self.Close()
def _onACLItemsCountRecv(self, xAsyncTCPClient, data, arg) :
count = unpack('>I', data)[0]
self._router.Log( 'SESSION %s > %s ACL SETUP RECEIVED' %
(self._getSessionName(), count) )
self._router.ClearACL()
if count > 0 :
self._recv(48, self._onACLItemRecv, count)
else :
self._waitDataTransmission()
def _onACLItemRecv(self, xAsyncTCPClient, data, arg) :
groupID, uid, authKey = IoTSocketStruct.DecodeACLItem(data.tobytes())
self._router.AddACLAccess(groupID, uid, authKey)
if arg > 1 :
self._recv(48, self._onACLItemRecv, arg-1)
else :
self._router.SaveACL()
self._waitDataTransmission()
def _onRequestRecv(self, xAsyncTCPClient, data, arg) :
uid = arg[0]
if len(arg) == 2 :
trackingNbr, dataFormat, formatOpt, dataLen = arg[1]
data = data.tobytes()
else :
hdr = IoTSocketStruct.DecodeRequestHdr(data.tobytes())
trackingNbr, dataFormat, formatOpt, dataLen = hdr
if dataLen > 0 :
self._recv(dataLen, self._onRequestRecv, (uid, hdr))
return
data = b''
if uid :
strUID = ('{%s}' % IoTSocketStruct.UIDFromBin128(uid))
else :
strUID = 'CENTRAL'
errCode = None
with self._requestsLock :
self._router.Log( 'SESSION %s > REQUEST TO %s RECEIVED (#%s)' %
(self._getSessionName(), strUID, trackingNbr) )
if not trackingNbr in self._requests :
if self._router.RouteRequest( fromUID = None if self._isCentral else self._uid,
toUID = uid,
trackingNbr = trackingNbr,
dataFormat = dataFormat,
formatOpt = formatOpt,
data = data ) :
exp = time() + self._reqTimeout
self._requests[trackingNbr] = (uid, exp)
else :
errCode = IoTSocketStruct.RESP_CODE_ERR_NO_DEST
else :
self._router.Log( 'SESSION %s > TRACKING NUMBER #%s ALREADY EXISTS' %
(self._getSessionName(), trackingNbr) )
errCode = IoTSocketStruct.RESP_CODE_ERR_SAME_TRK_NBR
if errCode :
self.Send(IoTSocketStruct.MakeResponseErrTR(uid, trackingNbr, errCode))
self._waitDataTransmission()
def _onResponseRecv(self, xAsyncTCPClient, data, arg) :
uid = arg[0]
if len(arg) == 2 :
trackingNbr, code, dataFormat, formatOpt, dataLen = arg[1]
data = data.tobytes()
else :
hdr = IoTSocketStruct.DecodeResponseHdr(data.tobytes())
trackingNbr, code, dataFormat, formatOpt, dataLen = hdr
if dataLen > 0 :
self._recv(dataLen, self._onResponseRecv, (uid, hdr))
return
data = b''
if uid :
strUID = ('{%s}' % IoTSocketStruct.UIDFromBin128(uid))
else :
strUID = 'CENTRAL'
self._router.Log( 'SESSION %s > RESPONSE TO %s RECEIVED (#%s)' %
(self._getSessionName(), strUID, trackingNbr) )
self._router.RouteResponse( fromUID = None if self._isCentral else self._uid,
toUID = uid,
trackingNbr = trackingNbr,
code = code,
dataFormat = dataFormat,
formatOpt = formatOpt,
data = data )
self._waitDataTransmission()
def _onCloseConnCodeRecv(self, xAsyncTCPClient, data, arg) :
self._router.Log('SESSION %s > CLOSE CONNECTION CODE RECEIVED' % self._getSessionName())
self._closedCode = data[0]
self.Close()
def _getSessionName(self) :
if self._isCentral :
return 'CENTRAL'
else :
return ('{%s}' % self._strUID)
def EndTrackingRequest(self, trackingNbr) :
with self._requestsLock :
if trackingNbr in self._requests :
del self._requests[trackingNbr]
def CheckRequestsTimeout(self, nowSec) :
if self._requests :
with self._requestsLock :
for trackingNbr in list(self._requests) :
uid, exp = self._requests[trackingNbr]
if nowSec >= exp :
del self._requests[trackingNbr]
self.Send( IoTSocketStruct.MakeResponseErrTR( uid,
trackingNbr,
IoTSocketStruct.RESP_CODE_ERR_TIMEOUT ) )
self._router.Log( 'SESSION %s > REQUEST TIMEOUT (#%s)' %
(self._getSessionName(), trackingNbr) )
@property
def UID(self) :
return self._uid
@property
def IsCentral(self) :
return self._isCentral
@property
def TelemetryToken(self) :
return self._telemetryToken