class feedbackThread(threading.Thread):
"""
"""
def __init__(self, requestQueue, responseQueue):
super(feedbackThread, self).__init__()
# Create queue attributes
self.requestQueue = requestQueue
self.responseQueue = responseQueue
# Read network database
self.db = DatabaseHandler()
# Fill router cap files
self.capFilesDict = self.pickCapFiles()
# Data structure that maintains a set of current flows passing
# through each router in the last second
self.router_flowsets = {}
self.updateRouterFlowSets()
def run(self):
"""
A dictionary of flow -> possible path list is read from the requestQueue.
A dictionary indexed by flow -> allocated path is returned
"""
queueLookupPeriod = 2 #seconds
while True:
try:
requestFlowsDict = self.requestQueue.get(timeout=queueLookupPeriod) # Blocking read
except:
# Update flow sets for each router
self.updateRouterFlowSets()
else:
#log.info("*** FEEDBACK REQUEST RECEIVED:\n")
#log.info(" %s\n"%str(requestFlowsDict))
self.updateRouterFlowSets()
responsePathDict = self.dealWithRequest(requestFlowsDict)
if responsePathDict != {}:
self.responseQueue.put(responsePathDict)
def updateRouterFlowSets(self):
for rid, capfile in self.capFilesDict.iteritems():
lines = capfile.readlines()
# Create new empty set
ridSet = set()
for line in lines:
try:
# Parse ip's
src_tmp = line.split(' ')[2]
src_ip_tmp = src_tmp.split('.')[:4]
src_ip = ipaddress.ip_address('.'.join(map(str, src_ip_tmp)))
dst_tmp = line.split(' ')[4].strip(':')
dst_ip_tmp = dst_tmp.split('.')[:4]
dport = dst_tmp.split('.')[4]
dst_ip = ipaddress.ip_address('.'.join(map(str, dst_ip_tmp)))
ridSet.update({((src_ip, 's'), (dst_ip, 'd'), dport)})
except:
pass
# Add set into dictionary
self.router_flowsets[rid] = ridSet
def dealWithRequest(self, requestFlowsDict):
"""
"""
# Results are saved here
responsePathDict = {}
start_time = time.time()
for f, pl in requestFlowsDict.iteritems():
#flowsSet.update({(f.src, f.sport, f.dst, f.dport)})
# We can't fix the source port from iperf client, so it
# will never match. This implies that same host can't same
# two UDP flows to the same destination host.
flowSet = set()
flowSet.update({((f.src.ip, 's'), (f.dst.ip, 'd'), str(f.dport))})
# Set of routers containing flow
routers_containing_flow = {self.db.getIpFromHostName(rid) for rid, rset in
self.router_flowsets.iteritems() if
rset.intersection(flowSet) != set()}
#log.info("*** SEARCHING:\n")
#log.info(" - %s\n"%f)
#log.info(" - %s\n"%str(list(routers_containing_flow)))
# Iterate path list and choose which of them is the one in
# which the flow is allocated
pathSetList = [(p, set(p)) for p in pl]
# Retrieve path that matches
chosen_path = [(p, pset) for (p, pset) in pathSetList if pset == routers_containing_flow]
if len(chosen_path) == 1:
responsePathDict[f] = chosen_path[0][0]
elif len(chosen_path) == 0:
pass
else:
log.info("*** FEEDBACK THREAD ERROR\n")
return responsePathDict
def pickCapFiles(self):
"""
Returns a dictionary indexed by router id -> corresponding .cap file
"""
return {rid: open(dconf.CAP_Path+rid+'.cap', 'r') for rid in self.db.routers_to_ip.keys()}
class TrafficGenerator(Base):
"""Object that creates a Traffic Generator in the network.
"""
def __init__(self, *args, **kwargs):
super(TrafficGenerator, self).__init__(*args, **kwargs)
self.scheduler = sched.scheduler(time.time, time.sleep)
self.db = DatabaseHandler()
self.thread_handlers = []
# IP of the Load Balancer Controller host.
try:
self._lbc_ip = ipaddress.ip_interface(self.db.getIpFromHostName(dconf.LBC_Hostname)).ip.compressed
except:
log.info("WARNING: Load balancer controller could not be found in the network\n")
self._lbc_ip = None
def _signal_handler(self, signal, frame):
"""
Terminates trafficgenerator thread gracefully.
"""
log.info("Signal caught... shuting down!\n")
# collect all open _createFlow threads
for t in self.thread_handlers:
# t.join()
log.info("_createFlow thread terminated\n")
# exit
sys.exit(0)
def informLBController(self, flow):
"""Part of the code that deals with the JSON interface to inform to
LBController a new flow created in the network.
"""
url = "http://%s:%s/newflowstarted" % (self._lbc_ip, dconf.LBC_JsonPort)
log.info("\t Informing LBController\n")
log.info("\t * Flow: %s\n" % self.toLogFlowNames(flow))
log.info("\t * Url: %s\n" % url)
try:
requests.post(url, json=flow.toJSON())
except Exception:
log.info("ERROR: LBC could not be informed!\n")
log.info("LOG: Exception in user code:\n")
log.info("-" * 60 + "\n")
log.info(traceback.print_exc())
log.info("-" * 60 + "\n")
def toLogFlowNames(self, flow):
a = "(%s -> %s): %s, t_o: %s, duration: %s"
return a % (
self.db.getNameFromIP(flow.src.compressed),
self.db.getNameFromIP(flow.dst.compressed),
flow.setSizeToStr(flow.size),
flow.setTimeToStr(flow.start_time),
flow.setTimeToStr(flow.duration),
)
def createFlow(self, flow):
"""Calls _createFlow in a different Thread (for efficiency)
"""
# Start thread that will send the Flask request
t = Thread(target=self._createFlow, name="_createFlow", args=(flow,)).start()
# Append thread handler to list
self.thread_handlers.append(t)
def _createFlow(self, flow):
"""Creates the corresponding iperf command to actually install the
given flow in the network. This function has to call
self.informLBController!
"""
# Sleep after it is your time to start
time.sleep(flow["start_time"])
# Call to informLBController if it is active
if self._lbc_ip:
self.informLBController(flow)
# time.sleep(0.2)
# Create new flow with hosts ip's instead of interfaces
# Iperf only understands ip's
flow2 = Flow(
src=flow["src"].ip.compressed,
dst=flow["dst"].ip.compressed,
sport=flow["sport"],
dport=flow["dport"],
size=flow["size"],
start_time=flow["start_time"],
duration=flow["duration"],
)
url = "http://%s:%s/startflow" % (flow2["src"], dconf.Hosts_JsonPort)
t = time.strftime("%H:%M:%S", time.gmtime())
log.info("%s - Starting Flow\n" % t)
log.info("\t Sending request to host %s\n" % str(flow["src"]))
log.info("\t * Flow: %s\n" % self.toLogFlowNames(flow))
log.info("\t * Url: %s\n" % url)
# Send request to host to start new iperf client session
try:
requests.post(url, json=flow2.toJSON())
except Exception:
log.info("ERROR: Request could not be sent to Host!\n")
log.info("LOG: Exception in user code:\n")
log.info("-" * 60 + "\n")
log.info(traceback.print_exc())
log.info("-" * 60 + "\n")
def stopFlow(self, flow):
"""Instructs host to stop iperf client session (flow).
"""
flow2 = Flow(
src=flow["src"].ip.compressed,
dst=flow["dst"].ip.compressed,
sport=flow["sport"],
dport=flow["dport"],
size=flow["size"],
start_time=flow["start_time"],
duration=flow["duration"],
)
url = "http://%s:%s/stopflow" % (flow2["src"], dconf.Hosts_JsonPort)
t = time.strftime("%H:%M:%S", time.gmtime())
log.info("%s - Stopping Flow\n" % t)
log.info("\t Sending request to host to stop flow %s\n" % str(flow["src"]))
log.info("\t * Flow: %s\n" % self.toLogFlowNames(flow))
log.info("\t * Url: %s\n" % url)
# Send request to host to start new iperf client session
try:
requests.post(url, json=flow2.toJSON())
except Exception:
log.info("ERROR: Stop flow request could not be sent to Host!\n")
def createRandomFlow(self):
"""Creates a random flow in the network
"""
pass
def scheduleRandomFlows(self, ex_time=60, max_size="40M"):
"""Creates a random schedule of random flows in the network. This will
be useful later to evaluate the performance of the
LBController.
"""
pass
def scheduleFileFlows(self, flowfile):
"""Schedules the flows specified in the flowfile
"""
f = open(flowfile, "r")
flows = f.readlines()
if flows:
for flowline in flows:
flowline = flowline.replace(" ", "").replace("\n", "")
if flowline != "" and flowline[0] != "#":
try:
[s, d, sp, dp, size, s_t, dur] = flowline.strip("\n").split(",")
# Get hosts IPs
src_iface = self.db.getIpFromHostName(s)
dst_iface = self.db.getIpFromHostName(d)
except Exception:
log.info("EP, SOMETHING HAPPENS HERE\n")
src_iface = None
dst_iface = None
if src_iface != None and dst_iface != None:
flow = Flow(
src=src_iface, dst=dst_iface, sport=sp, dport=dp, size=size, start_time=s_t, duration=dur
)
# Schedule flow creation
self.scheduler.enter(0, 1, self.createFlow, ([flow]))
else:
log.info("ERROR! Hosts %s and/or %s do not exist in the network!\n" % (s, d))
# Make the scheduler run after file has been parsed
self.scheduler.run()
else:
log.info("\t No flows to schedule in file\n")
