__author__ = 'Manuela Kuhn <manuela.kuhn@desy.de>'
import time
import zmq
import logging
import os
import sys
import traceback
import copy
import pickle
from multiprocessing import Process
from WorkerProcess import WorkerProcess
#path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
SHARED_PATH = os.path.dirname ( os.path.dirname ( os.path.realpath ( __file__ ) ) ) + os.sep + "shared"
if not SHARED_PATH in sys.path:
sys.path.append ( SHARED_PATH )
del SHARED_PATH
import helperScript
#
# -------------------------- class: SignalHandler --------------------------------------
#
class SignalHandler():
def __init__ (self, whiteList,
comPort, signalFwPort, requestPort,
context = None):
# to get the logging only handling this class
log = None
self.context = context or zmq.Context()
self.localhost = "127.0.0.1"
self.extIp = "0.0.0.0"
self.comPort = comPort
self.signalFwPort = signalFwPort
self.requestPort = requestPort
self.openConnections = []
self.openRequVari = []
self.openRequPerm = []
self.allowedQueries = []
self.whiteList = []
#remove .desy.de from hostnames
for host in whiteList:
if host.endswith(".desy.de"):
self.whiteList.append(host[:-8])
else:
self.whiteList.append(host)
# sockets
self.comSocket = None
self.requestFwSocket = None
self.requestSocket = None
self.log = self.getLogger()
self.log.debug("Init")
self.createSockets()
try:
self.run()
except KeyboardInterrupt:
pass
except:
trace = traceback.format_exc()
self.log.info("Stopping signalHandler due to unknown error condition.")
self.log.debug("Error was: " + str(trace))
def getLogger (self):
logger = logging.getLogger("SignalHandler")
return logger
def createSockets (self):
# create zmq socket for signal communication with receiver
self.comSocket = self.context.socket(zmq.REP)
connectionStr = "tcp://{ip}:{port}".format(ip=self.extIp, port=self.comPort)
try:
self.comSocket.bind(connectionStr)
self.log.info("Start comSocket (bind): '" + connectionStr + "'")
except Exception as e:
self.log.error("Failed to start comSocket (bind): '" + connectionStr + "'")
self.log.debug("Error was:" + str(e))
# setting up router for load-balancing worker-processes.
# each worker-process will handle a file event
self.requestFwSocket = self.context.socket(zmq.REP)
connectionStr = "tcp://{ip}:{port}".format(ip=self.localhost, port=self.signalFwPort)
try:
self.requestFwSocket.bind(connectionStr)
self.log.info("Start requestFwSocket (bind): '" + connectionStr + "'")
except Exception as e:
self.log.error("Failed to start requestFwSocket (bind): '" + connectionStr + "'")
self.log.debug("Error was:" + str(e))
# create socket to receive requests
self.requestSocket = self.context.socket(zmq.PULL)
connectionStr = "tcp://{ip}:{port}".format(ip=self.extIp, port=self.requestPort)
try:
self.requestSocket.bind(connectionStr)
self.log.debug("requestSocket started (bind) for '" + connectionStr + "'")
except Exception as e:
self.log.error("Failed to start requestSocket (bind): '" + connectionStr + "'")
self.log.debug("Error was:" + str(e))
# Poller to distinguish between start/stop signals and queries for the next set of signals
self.poller = zmq.Poller()
self.poller.register(self.comSocket, zmq.POLLIN)
self.poller.register(self.requestFwSocket, zmq.POLLIN)
self.poller.register(self.requestSocket, zmq.POLLIN)
def run (self):
#run loop, and wait for incoming messages
self.log.debug("Waiting for new signals or requests.")
while True:
socks = dict(self.poller.poll())
if self.requestFwSocket in socks and socks[self.requestFwSocket] == zmq.POLLIN:
try:
incomingMessage = self.requestFwSocket.recv()
if incomingMessage == "STOP":
self.requestFwSocket.send(incomingMessage)
time.sleep(0.1)
break
self.log.debug("New request for signals received.")
openRequests = copy.deepcopy(self.openRequPerm)
for requestSet in self.openRequVari:
if requestSet:
tmp = requestSet.pop(0)
openRequests.append(tmp)
if openRequests:
self.requestFwSocket.send(pickle.dumps(openRequests))
self.log.debug("Answered to request: " + str(openRequests))
else:
openRequests = ["None"]
self.requestFwSocket.send(pickle.dumps(openRequests))
self.log.debug("Answered to request: " + str(openRequests))
except Exception, e:
self.log.error("Failed to receive/answer new signal requests.")
trace = traceback.format_exc()
self.log.debug("Error was: " + str(trace))
# continue
if self.comSocket in socks and socks[self.comSocket] == zmq.POLLIN:
self.log.debug("")
self.log.debug("comSocket")
self.log.debug("")
incomingMessage = self.comSocket.recv_multipart()
self.log.debug("Received signal: " + str(incomingMessage) )
checkStatus, signal, target = self.checkSignal(incomingMessage)
if checkStatus:
self.reactToSignal(signal, target)
if self.requestSocket in socks and socks[self.requestSocket] == zmq.POLLIN:
self.log.debug("")
self.log.debug("!!!! requestSocket !!!!")
self.log.debug("")
incomingMessage = self.requestSocket.recv_multipart()
self.log.debug("Received request: " + str(incomingMessage) )
# print "allowedQueries", self.allowedQueries
for index in range(len(self.allowedQueries)):
# no double requests from the same socket TODO do we want that?
# print "allowedQueries[", index, "]", self.allowedQueries[index]
# print "openRequVari", self.openRequVari
# print "incomingMessage", incomingMessage[1]
for i in range(len(self.allowedQueries[index])):
if incomingMessage[1] == self.allowedQueries[index][i][0]:
self.openRequVari[index].append(self.allowedQueries[index][i])
self.log.debug("Add to openRequVari: " + str(self.allowedQueries[index][i]) )
# print "openRequVari", self.openRequVari
def checkSignal (self, incomingMessage):
if len(incomingMessage) != 3:
self.log.info("Received signal is of the wrong format")
self.log.debug("Received signal is too short or too long: " + str(incomingMessage))
return False, None, None, None
else:
version, signal, target = incomingMessage
target = pickle.loads(target)
host = [t[0].split(":")[0] for t in target]
if version:
if helperScript.checkVersion(version, self.log):
self.log.debug("Versions are compatible: " + str(version))
else:
self.log.debug("Version are not compatible")
self.sendResponse("VERSION_CONFLICT")
return False, None, None, None
if signal and host:
# Checking signal sending host
self.log.debug("Check if host to send data to are in WhiteList...")
if helperScript.checkHost(host, self.whiteList, self.log):
self.log.debug("Hosts are allowed to connect.")
self.log.debug("hosts: " + str(host))
else:
self.log.debug("One of the hosts is not allowed to connect.")
self.log.debug("hosts: " + str(host))
self.sendResponse("NO_VALID_HOST")
return False, None, None, None
return True, signal, target
def sendResponse (self, signal):
self.log.debug("send confirmation back to receiver: " + str(signal) )
self.comSocket.send(signal, zmq.NOBLOCK)
def reactToSignal (self, signal, socketIds):
# React to signal
if signal == "START_STREAM":
#FIXME
socketId = socketIds[0]
self.log.info("Received signal: " + signal + " to host " + str(socketId) + \
" with priority " + str(socketId[1]))
if socketId in [i[0] for i in self.openRequPerm]:
self.log.info("Connection to " + str(socketId) + " is already open")
self.sendResponse("CONNECTION_ALREADY_OPEN")
else:
# send signal back to receiver
self.sendResponse(signal)
self.log.debug("Send response back: " + str(signal))
self.openRequPerm.append(socketId)
return
elif signal == "STOP_STREAM":
#FIXME
socketId = socketIds[0]
self.log.info("Received signal: " + signal + " to host " + str(socketId[0]))
if socketId in [i[0] for i in self.openRequPerm]:
# send signal back to receiver
self.sendResponse(signal)
self.log.debug("Send response back: " + str(signal))
self.openRequPerm.remove(socketId)
else:
self.log.info("No connection to close was found for " + str(socketId))
self.sendResponse("NO_OPEN_CONNECTION_FOUND")
return
elif signal == "START_QUERY_NEXT":
self.log.info("Received signal to enable querying for data for hosts: " + str(socketIds))
connectionFound = False
tmpAllowed = []
for socketConf in socketIds:
socketId = socketConf[0]
if socketId in [ i[0] for i in self.allowedQueries]:
connectionFound = True
self.log.info("Connection to " + str(socketId) + " is already open")
self.sendResponse("CONNECTION_ALREADY_OPEN")
elif socketId not in [ i[0] for i in tmpAllowed]:
tmpAllowed.append(socketConf)
else:
#TODO send notification (double entries in START_QUERY_NEXT) back?
pass
if not connectionFound:
# send signal back to receiver
self.sendResponse(signal)
self.allowedQueries.append(sorted(tmpAllowed))
self.openRequVari.append([])
self.log.debug("Send response back: " + str(signal))
return
elif signal == "STOP_QUERY_NEXT":
self.log.info("Received signal to disable querying for data for hosts: " + str(socketIds))
connectionNotFound = False
tmpRemoveIndex = []
found = False
for socketConf in socketIds:
socketId = socketConf[0]
for i in range(len(self.allowedQueries)):
for j in range(len(self.allowedQueries[i])):
if socketId == self.allowedQueries[i][j][0]:
tmpRemoveIndex.append([i,j])
found = True
if not found:
connectionNotFound = True
if connectionNotFound:
self.sendResponse("NO_OPEN_CONNECTION_FOUND")
self.log.info("No connection to close was found for " + str(socketConf))
else:
# send signal back to receiver
self.sendResponse(signal)
self.log.debug("Send response back: " + str(signal))
for i, j in tmpRemoveIndex:
self.log.debug("Remove " + str(self.allowedQueries[i][j]) + " from allowedQueries.")
socketId = self.allowedQueries[i].pop(j)[0]
self.openRequVari = [ [ b for b in self.openRequVari[a] if socketId != b[0] ] for a in range(len(self.openRequVari)) ]
self.log.debug("Remove all occurences from " + str(socketId) + " from openRequVari.")
if not self.allowedQueries[i]:
del self.allowedQueries[i]
del self.openRequVari[i]
return
else:
self.log.info("Received signal from host " + str(host) + " unkown: " + str(signal))
self.sendResponse("NO_VALID_SIGNAL")
def stop (self):
self.log.debug("Closing sockets")
self.comSocket.close(0)
self.requestFwSocket.close(0)
self.requestSocket.close(0)
def __exit__ (self):
self.stop()
def __del__ (self):
self.stop()
if __name__ == '__main__':
from multiprocessing import Process
import time
class requestPuller():
def __init__ (self, requestFwPort, context = None):
self.context = context or zmq.Context.instance()
self.requestFwSocket = self.context.socket(zmq.REQ)
connectionStr = "tcp://localhost:" + requestFwPort
self.requestFwSocket.connect(connectionStr)
logging.info("[getRequests] requestFwSocket started (connect) for '" + connectionStr + "'")
self.run()
def run (self):
logging.info("[getRequests] Start run")
while True:
self.requestFwSocket.send("")
logging.info("[getRequests] send")
requests = pickle.loads(self.requestFwSocket.recv())
logging.info("[getRequests] Requests: " + str(requests))
time.sleep(0.25)
def __exit__(self):
self.requestFwSocket.close(0)
self.context.destroy()
# def __del__(self):
# self.requestFwSocket.close(0)
# self.context.destroy()
helperScript.initLogging("/space/projects/live-viewer/logs/signalHandler.log", verbose=True, onScreenLogLevel="debug")
whiteList = ["localhost", "zitpcx19282"]
comPort = "6000"
requestFwPort = "6001"
requestPort = "6002"
signalHandlerProcess = Process ( target = SignalHandler, args = (whiteList, comPort, requestFwPort, requestPort) )
signalHandlerProcess.start()
requestPullerProcess = Process ( target = requestPuller, args = (requestFwPort, ) )
requestPullerProcess.start()
def sendSignal(socket, signal, ports, prio = None):
logging.info("=== sendSignal : " + signal + ", " + str(ports))
sendMessage = ["0.0.1", signal]
targets = []
if type(ports) == list:
for port in ports:
targets.append(["zitpcx19282:" + port, prio])
else:
targets.append(["zitpcx19282:" + ports, prio])
targets = pickle.dumps(targets)
sendMessage.append(targets)
socket.send_multipart(sendMessage)
receivedMessage = socket.recv()
logging.info("=== Responce : " + receivedMessage )
def sendRequest(socket, socketId):
sendMessage = ["NEXT", socketId]
logging.info("=== sendRequest: " + str(sendMessage))
socket.send_multipart(sendMessage)
logging.info("=== request sent: " + str(sendMessage))
def getRequests(socket):
logging.info("=== getRequests")
socket.send("")
requests = socket.recv_multipart()
logging.info("=== Requests: " + str(requests))
context = zmq.Context.instance()
comSocket = context.socket(zmq.REQ)
connectionStr = "tcp://zitpcx19282:" + comPort
comSocket.connect(connectionStr)
logging.info("=== comSocket connected to " + connectionStr)
requestSocket = context.socket(zmq.PUSH)
connectionStr = "tcp://zitpcx19282:" + requestPort
requestSocket.connect(connectionStr)
logging.info("=== requestSocket connected to " + connectionStr)
requestFwSocket = context.socket(zmq.REQ)
connectionStr = "tcp://localhost:" + requestFwPort
requestFwSocket.connect(connectionStr)
logging.info("=== requestFwSocket connected to " + connectionStr)
time.sleep(1)
sendSignal(comSocket, "START_STREAM", "6003", 1)
sendSignal(comSocket, "START_STREAM", "6004", 0)
sendSignal(comSocket, "STOP_STREAM", "6003")
sendRequest(requestSocket, "zitpcx19282:6006")
sendSignal(comSocket, "START_QUERY_NEXT", ["6005", "6006"], 2)
sendRequest(requestSocket, "zitpcx19282:6005")
sendRequest(requestSocket, "zitpcx19282:6005")
sendRequest(requestSocket, "zitpcx19282:6006")
time.sleep(0.5)
sendRequest(requestSocket, "zitpcx19282:6005")
sendSignal(comSocket, "STOP_QUERY_NEXT", "6005", 2)
time.sleep(1)
requestFwSocket.send("STOP")
requests = requestFwSocket.recv()
logging.debug("=== Stop: " + requests)
signalHandlerProcess.join()
requestPullerProcess.terminate()
comSocket.close(0)
requestSocket.close(0)
requestFwSocket.close(0)
context.destroy()