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instrumentation.py
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instrumentation.py
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from pyChord import Peer, getHash, getHashString, RPCThreading, MAINT_INT
from chordReduce import ChordReduceNode as Node
import time
import random
import sys, traceback
from threading import Thread
CHURN_RATE = 0.05 #chance out of 1 per second per node
PORTS = range(9101,9999)
TEST_SIZE = 20
TEST_FILE = "constitution.txt"
class ExperimentNode(Node):
def __init__(self,ip,port,instrumentation):
Node.__init__(self,ip,port)
#super().__init__(ip,port)
self.inst = instrumentation
self.addNewFunc(self.kill,"kill")
self.addNewFunc(self.ping,"ping")
def create(self):
super(ExperimentNode,self).create()
Peer(self.inst).checkIn(self.name)
return True
def join(self,nodeName):
super(ExperimentNode,self).join(nodeName)
Peer(self.inst).checkIn(self.name)
return True
def ping(self,nodeName):
try:
print self.name, "pinging",nodeName
Peer(nodeName).isAlive()
except Exception as e:
print self.name, e
return True
# public
# paradigms
"""
alternatives
1) rerun init if possible
2) manually stop threads, change IP, PORT, and create a new server
"""
def kill(self,newPort, polite = False):
self.server.finished = True
self.running = False
x = self
self = self.__init__(self.ip,newPort,self.inst)
return True
class InstrumentationNode(object):
def __init__(self,ip,port):
self.ip = ip
self.port = port
self.name = "http://"+str(ip)+":"+str(port)
self.hashid = getHash(self.name)
self.server = RPCThreading(("",port),logRequests=False)
#register functions here
self.server.register_function(self.checkIn,"checkIn")
self.server.register_function(self.report,"report")
self.aliveNodes = []
self.deadNodes = []
self.safe = []
self.churnThread = None
t = Thread(target=self.server.serve_forever)
t.start()
self.churn = False
self.choosing = False
# kill a random node in the network
def killRandom(self):
self.kill(random.choice(self.aliveNodes))
# rez a random node
def rezRandom(self):
self.rez(random.choice(self.deadNodes),random.choice(self.aliveNodes))
# tell a node to pretend to diaf
def kill(self,victim):
newPort = random.choice(PORTS)
print "Killing", victim, getHashString(victim)
try:
oldPort = int(victim[victim.rfind(":")+1:])
newName = victim[:victim.rfind(":")+1]+str(newPort)
Peer(victim).kill(newPort)
self.aliveNodes.remove(victim)
self.deadNodes.append(newName)
PORTS.remove(newPort)
PORTS.append(oldPort) #do at end
except Exception as e:
print "He's already dead", e
# add node back in
def rez(self, nodeName, ringMember):
print "Rezzing", nodeName, getHashString(nodeName)
try:
Peer(nodeName).join(ringMember)
self.deadNodes.remove(nodeName)
except Exception as e:
print "Error rezzing", e
# splits up nodes among the dead and living according to ratio
def setupExperiment(self):
targets = self.aliveNodes[:]
for node in targets:
self.kill(node)
print "Wanton destruction complete."
print "alive:", self.aliveNodes
print len(targets), len(self.deadNodes)
time.sleep(2)
print "Creating new network."
n = random.choice(self.deadNodes)
Peer(n).create()
self.deadNodes.remove(n)
## adding the rest
while len(self.aliveNodes) < len(self.deadNodes):
self.rezRandom()
time.sleep(MAINT_INT)
print "Done."
self.startChurn()
print "Storing."
self.choosing = True
tester = random.choice(self.aliveNodes)
self.safe.append(tester)
self.choosing = False
try:
Peer(tester).storeFile(TEST_FILE)
except:
print "failed."
traceback.print_exc(file=sys.stdout)
print "terminating."
return
print "Store done."
self.safe.pop()
self.choosing = True
tester = random.choice(self.aliveNodes)
outputAddress = getHashString( Peer(tester).name)
print outputAddress
self.safe.append(tester)
self.choosing = False
try:
Peer(tester).stage(TEST_FILE, outputAddress)
except:
print "failed."
traceback.print_exc(file=sys.stdout)
print "terminating."
return
print "Stage done."
#self.safe.pop()
#print "Churning the network before we retrieve."
#time.sleep(10)
"""
for node in self.aliveNodes:
try:
print Peer(node).myInfo()
except Exception as e:
print e
self.churn = False
print "Done."
"""
# public
def checkIn(self,nodeName):
self.aliveNodes.append(nodeName)
print nodeName, "checked in."
return True
def startChurn(self):
print "Allowing network to establish before Churn."
time.sleep(3)
self.churnThread = Thread(target=self.simulateChurn)
self.churnThread.daemon = True
self.churn = True
self.churnThread.start()
print "Started Churn."
time.sleep(5)
def simulateChurn(self):
while self.churn:
if not self.choosing:
try:
time.sleep(1)
for node in self.aliveNodes[:]:
if node not in self.safe and len(self.aliveNodes) > 1 and random.random() < CHURN_RATE:
self.kill(node)
joinTargets = self.aliveNodes[:]
for node in self.deadNodes[:]:
if len(self.deadNodes) > 1 and random.random() < CHURN_RATE:
self.rez(node, random.choice(joinTargets))
except Exception, e:
print "Error in Churn", e
print "Churning done!"
# public
def report(self,nodeName, data):
return True
port = PORTS[0]-1
iNode = InstrumentationNode("127.0.0.1",port)
n1 = ExperimentNode("127.0.0.1",port+1,iNode.name)
n2 = ExperimentNode("127.0.0.1",port+2,iNode.name)
n1.create()
n2.join(n1.name)
nodes = [n1,n2]
for i in range(3,TEST_SIZE+1):
n = ExperimentNode("127.0.0.1",port+i, iNode.name)
n.join(random.choice(nodes).name)
nodes.append(n)
time.sleep(MAINT_INT)
PORTS = PORTS[TEST_SIZE+1:]
iNode.setupExperiment()