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replica.da
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#!/usr/bin/python
import sys
import os
import time
import random
import string
import copy
from datetime import datetime
from utils import Utils, State
from operation import Operation
from datetime import datetime
from orderStatement import OrderStatement
from resultStatement import ResultStatement
from checkpointStatement import CheckpointStatement
from wedgedMessage import WedgedMessage
from shuttle import Shuttle
from checkpointShuttle import CheckpointShuttle
CLIENT = import_da('client')
OLYMPUS = import_da('olympus')
config(channel is {fifo,reliable}, clock is lamport)
class Replica(process):
def setup(olympus, replicaPublicKeys, replicaPrivateKey, olympusPublicKey, state, head_timeout, nonhead_timeout, failures, checkpt_interval, runningstate, clientPublicKeys):
self.state = state
self.olympus = olympus
self.replicaPublicKeys = replicaPublicKeys
self.olympusPublicKey = olympusPublicKey
self.replicaPrivateKey = replicaPrivateKey
self.clientPublicKeys = clientPublicKeys
self.isHeadFlag = False
self.isTailFlag = False
self.predecessorReplica = None
self.successorReplica = None
self.Id = None
self.head=None
self.tail = None
self.nonhead_timeout = nonhead_timeout
self.head_timeout = head_timeout
self.runningstate = runningstate
self.requestIdToForwardedRequests = {}
self.requestIdToResultShuttle = {}
self.slotNo = -1
self.failures = failures
self.inProcessRequestIds = {}
self.historyoforderproofs = []
self.historyofcheckpointproofs = []
self.utils = Utils()
self.checkpt_interval = checkpt_interval
self.runningstateForCheckpoint = {}
self.lastresultstatement = {}
##For Failure Triggers
self.directlyfromclient = {}
self.forwardedmessageforclient = {}
self.shuttleforclient = {}
self.resultshuttleforclient = {}
self.failureInjections = {}
self.checkpoints = -1
self.completed_checkpoints = -1
self.catch_up = -1
self.wedge_request =-1
self.get_running_state = -1
##Failure Trigger##########
failurekey = "new_configuration("+str(0)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " during sending shuttle forward")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "increment_slot()" in self.failureInjections : ##Increment Slot Message
output("Increment Slot Failure Triggered at replica: " + str(self))
self.failureInjections["increment_slot()"] -=1
if self.failureInjections["increment_slot()"] == 0:
self.failureInjections.pop("increment_slot()")
if self.isHeadFlag:
self.slotNo = self.slotNo + 1
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
def run():
output("********Starting Replica" + str(self)+ "*****")
-- yieldInitializeHistory
await(some(received(('Become Active',_, _, _,_), from_ = olympus)))
await(some(received(('Finised Processing'), from_ = olympus)))
def check_validity_of_order_proof(shuttle):
order_statements = shuttle.order_proof
operation_object = shuttle.operation
for i in range(0, len(order_statements)):
try:
order_statement = utils.verifySignature(order_statements[i], self.replicaPublicKeys[i]).decode('UTF-8')
if str(order_statement)!=str(operation_object):
return False
except:
return False
return True
def check_validity_of_result_proof(shuttle, result):
result_statements = shuttle.result_proof
for i in range(0, len(result_statements)):
try:
statement = utils.verifySignature(result_statements[i] , replicaPublicKeys[i])
hash = statement.decode('UTF-8').split(';')[-1]
if utils.verifyHash(result, hash.encode('utf-8')) == False:
return False
except:
return False
return True
def execute_operation(operation, key, value):
output = "None"
if operation == "put" :
self.runningstate[key] = value
output = "OK"
elif operation == "get":
if key in self.runningstate:
output = self.runningstate[key]
else:
output = ""
elif operation == "slice":
if key in self.runningstate:
(i,j) = value.split(':')
val = self.runningstate[key]
if int(j)<len(val) and int(i)>=0:
self.runningstate[key] = val[int(i):int(j)]
output = "OK"
else:
output = "Fail"
elif operation == "append":
if key in self.runningstate:
self.runningstate[key]+=str(value)
output = "OK"
else:
output = "Fail"
return output
def execute_operation_of_client(client, shuttle, signed_workload):
operation_object = copy.deepcopy(shuttle.operation)
requestId = operation_object.requestId
order_proof = shuttle.order_proof
result_proof = shuttle.result_proof
if self.state == State.ACTIVE.value:
#### Checking for client request signature ##########
clientId = requestId.split(':')[0][1:]
decoded_workload = ""
verification = True
try:
decoded_workload = utils.verifySignature(signed_workload, self.clientPublicKeys[int(clientId)]).decode('UTF-8')
except Exception:
verification = False
actual_workload = Operation().getWorkload(operation_object)
if str(decoded_workload) != str(actual_workload) or verification == False:
output("Proof of Misbehaviour detected at replica " + str(self) + " due to invalid signature of client" + str(client) + "for requestid: " + requestId)
output("Sending Reconfiguration Request to Olympus from Replica " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
return
#####################################################
#### Checking for holes #############################
if self.isHeadFlag == False and operation_object.slotNo != self.slotNo + 1:
output("Proof of Misbehaviour detected at replica " + str(self) + " due to holes at requestid: " + requestId)
output("Expected slot No: " + str(self.slotNo + 1) + " , Actual slotNo recieved : " + str(operation_object.slotNo))
output("Sending Reconfiguration Request to Olympus from Replica " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
return
#####################################################
if check_validity_of_order_proof(shuttle):
output("Executing operation: " + operation_object.command + " with requestId "+ operation_object.requestId + " at replica " + str(self))
##variables updation
self.slotNo = operation_object.slotNo
self.inProcessRequestIds[requestId] = 1
msgNo = int(requestId.split(':')[1])
cid = requestId.split(':')[0]
##Failure Injections#################
if "change_operation()" in self.failureInjections : ##Change Operation
output("Change Operation Failure Triggered at replica: " + str(self))
operation_object.command = "get"
operation_object.key = "x"
operation_object.value = ""
self.failureInjections["change_operation()"] -=1
if self.failureInjections["change_operation()"] == 0:
self.failureInjections.pop("change_operation()")
#######################################
## order statement created
order_statement = OrderStatement()
order_statement.operation = operation_object
##order statement signed
signed_order_statement = utils.getSignedStatement(self.replicaPrivateKey, str(order_statement))
##Failure Injections#################
if "invalid_order_sig()" in self.failureInjections : ##Invalid Order Signature Operation
output("Invalid Order Statement Signature Failure Triggered at replica: " + str(self))
signed_order_statement = utils.getInvalidSignedStatement(signed_order_statement)
self.failureInjections["invalid_order_sig()"] -=1
if self.failureInjections["invalid_order_sig()"] == 0:
self.failureInjections.pop("invalid_order_sig()")
#######################################
order_proof.append(signed_order_statement)
### operation object items
key = operation_object.key
value = operation_object.value
operation = operation_object.command
##get output from execution of operation
output = execute_operation(operation, key, value)
if self.slotNo % self.checkpt_interval == self.checkpt_interval - 1:
self.runningstateForCheckpoint = self.runningstate
##Failure Injections######################
if "change_result()" in self.failureInjections : ##Change Result
output("Change Result Failure Triggered at replica: " + str(self))
output = "OK"
self.failureInjections["change_result()"] -=1
if self.failureInjections["change_result()"] == 0:
self.failureInjections.pop("change_result()")
#########################################
result_hash = utils.getHash(output)
result_statement = ResultStatement()
result_statement.operation = operation_object
result_statement.result = result_hash
signed_result_statement = utils.getSignedStatement(self.replicaPrivateKey, str(result_statement))
##Failure Injections#################
if "invalid_result_sig()" in self.failureInjections : ##Invalid Result Signature Operation
output("Invalid Result Statement Signature Failure Triggered at replica: " + str(self))
#if self.isTailFlag:
signed_result_statement = utils.getInvalidSignedStatement(signed_result_statement)
self.failureInjections["invalid_result_sig()"] -=1
if self.failureInjections["invalid_result_sig()"] == 0:
self.failureInjections.pop("invalid_result_sig()")
#########################################
result_proof.append(signed_result_statement)
##Failure Injections######################
if "drop_result_stmt()" in self.failureInjections : ##Omit Result statement
# print("Before changing " + str(result_proof))
output("Omit Result Statement Failure Triggered at replica: " + str(self))
shuttle.result_proof = shuttle.result_proof[1:]
self.failureInjections["drop_result_stmt()"] -=1
if self.failureInjections["drop_result_stmt()"] == 0:
self.failureInjections.pop("drop_result_stmt()")
#########################################
self.historyoforderproofs.append(order_proof)
self.lastresultstatement[cid] = (output, signed_result_statement, operation_object)
if self.isTailFlag == True:
result_shuttle = Shuttle()
result_shuttle.operation = operation_object
result_statement.result = result_hash
result_shuttle.result_proof = result_proof
self.inProcessRequestIds[requestId] = 0
self.requestIdToResultShuttle[requestId] = (output, result_shuttle)
send(('Forward Result to Client', output, result_shuttle.result_proof, requestId), to = client)
send(('Forward Shuttle to Predecessor', result_shuttle, output, requestId), to = self.predecessorReplica)
else:
send(('Forward Shuttle To Successor', shuttle, client, signed_workload), to = self.successorReplica)
else:
output("Proof of Misbehaviour detected at replica " + str(self) + " due to invalid order proof of request: " + requestId)
output("Sending Reconfiguration Request to Olympus from Replica " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
else:
output("Replica " + str(self) + " is immutable now")
def receive(msg = ('Forward Shuttle To Successor', shuttle, client, signed_workload), from_ = self.predecessorReplica):
operation_object = copy.deepcopy(shuttle.operation)
output("Received shuttle from the previous replica -> " + str(self.predecessorReplica) + " on replica " + str(self) + " for operation: "+ operation_object.command + " and request: " + operation_object.requestId)
if self.state == State.ACTIVE.value:
cid = operation_object.requestId.split(':')[0]
try:
self.shuttleforclient[cid]+=1
except KeyError:
self.shuttleforclient[cid]=0
m = self.shuttleforclient[cid]
# print(str(self.shuttleforclient) + " in replica" + str(self))
##Failure Trigger##########
failurekey = "shuttle("+str(cid[1:])+","+str(m)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
# print("Reuqest id " + operation_object.requestId)
# print("Failure key" + failurekey)
# print("failures " + str(self.failures))
# print("Injections at replica during forwrding shuttle"+ str(self) +" " + str(self.failureInjections))
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " during sending shuttle forward")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
execute_operation_of_client(client, shuttle, signed_workload)
def receive(msg = ('Forward Shuttle to Predecessor', result_shuttle, result, requestId), from_ = self.successorReplica):
output("Received result shuttle from the successor replica -> " + str(self.successorReplica) + " on replica " + str(self) + " for request: " + requestId)
if self.state == State.ACTIVE.value:
cid = requestId.split(':')[0]
try:
self.resultshuttleforclient[cid]+=1
except KeyError:
self.resultshuttleforclient[cid]=0
m = self.resultshuttleforclient[cid]
##Failure Trigger##########
failurekey = "result_shuttle("+str(cid[1:])+","+str(m)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " during sending result shuttle backward")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "increment_slot()" in self.failureInjections : ##Increment Slot Message
output("Increment Slot Failure Triggered at replica: " + str(self))
self.failureInjections["increment_slot()"] -=1
if self.failureInjections["increment_slot()"] == 0:
self.failureInjections.pop("increment_slot()")
if self.isHeadFlag:
self.slotNo = self.slotNo + 1
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
if check_validity_of_result_proof(result_shuttle, result):
self.inProcessRequestIds[requestId] = 0
self.requestIdToResultShuttle[requestId] = (result, result_shuttle)
##Check for failure injections here###############
if "change_result()" in self.failureInjections : ##Change Result
output("Change Result Statement Failure Triggered at replica: " + str(self))
output = "OK"
result_hash = utils.getHash(output)
result_statement = ResultStatement()
result_statement.result = result_hash
signed_result_statement = utils.getSignedStatement(self.replicaPrivateKey, str(result_statement))
result_shuttle.result_proof[int(self.Id[1:])] = signed_result_statement
result_shuttle.result = result_hash
self.failureInjections["change_result()"] -=1
if self.failureInjections["change_result()"] == 0:
self.failureInjections.pop("change_result()")
if "drop_result_stmt()" in self.failureInjections : ##Omit Result statement
output("Omit Result Statement Failure Triggered at replica: " + str(self))
result_shuttle.result_proof = result_shuttle.result_proof[1:]
self.failureInjections["drop_result_stmt()"] -=1
if self.failureInjections["drop_result_stmt()"] == 0:
self.failureInjections.pop("drop_result_stmt()")
##################################################
if isHeadFlag != True:
send(('Forward Shuttle to Predecessor', result_shuttle, result, requestId), to = self.predecessorReplica)
else:
output("Proof of Misbehaviour detected at replica " + str(self) + " due to invalid result proof of request: " + requestId)
output("Sending Reconfiguration Request to Olympus from Replica " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
else:
output("Replica " + str(self) + " is immutable now")
def receive(msg = ('Execute Operation Of Client', operation_object, client, signed_workload), from_ = p):
if self.state == State.ACTIVE.value :
output("Received operation_object " + str(operation_object) + " on head: " + str(self) + " for requestId: " + operation_object.requestId)
cid = operation_object.requestId.split(':')[0]
try:
self.directlyfromclient[cid]+=1
except KeyError:
self.directlyfromclient[cid]=0
m = self.directlyfromclient[cid]
##Failure Trigger##########
failurekey = "client_request("+str(cid[1:])+","+str(m)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " when receiving operation from client")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "increment_slot()" in self.failureInjections : ##Increment Slot Message
output("Increment Slot Failure Triggered at replica: " + str(self))
self.failureInjections["increment_slot()"] -=1
if self.failureInjections["increment_slot()"] == 0:
self.failureInjections.pop("increment_slot()")
if self.isHeadFlag:
self.slotNo = self.slotNo + 1
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
##Creating new shuttle here###
self.slotNo = self.slotNo + 1
operation_object.slotNo = self.slotNo
shuttle = Shuttle()
shuttle.operation = operation_object
#############################
execute_operation_of_client(client, shuttle, signed_workload)
initiate_checkpoint_periodically()
def initiate_checkpoint_periodically():
if self.state == State.ACTIVE.value:
self.checkpoints += 1
##Failure Trigger##########
failurekey = "checkpoint("+str(self.checkpoints)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " during sending the checkpoint shuttle forward")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "increment_slot()" in self.failureInjections : ##Increment Slot Message
output("Increment Slot Failure Triggered at replica: " + str(self))
self.failureInjections["increment_slot()"] -=1
if self.failureInjections["increment_slot()"] == 0:
self.failureInjections.pop("increment_slot()")
if self.isHeadFlag:
self.slotNo = self.slotNo + 1
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
if self.slotNo != 0 and self.slotNo % self.checkpt_interval == 0:
if self.isHeadFlag == True:
output("Initializing checkpoint upto slotNo: " + str(self.slotNo-1) + " on replica: " + str(self))
else:
output("Initializing checkpoint upto slotNo: " + str(self.slotNo) + " on replica: " + str(self))
checkpoint_statement = CheckpointStatement()
checkpoint_statement.checkpoint_slot = self.slotNo
#output("Running State: " + str(self.runningstateForCheckpoint))
checkpoint_statement.running_state = utils.getHash(str(self.runningstateForCheckpoint))
#Sign Checkpoint Statement and add to checkpoint proof
signed_checkpoint_statement = utils.getSignedStatement(self.replicaPrivateKey, str(checkpoint_statement))
checkpoint_proof = []
checkpoint_proof.append(signed_checkpoint_statement)
#Create check point shuttle and send to successor replica
checkpoint_shuttle = CheckpointShuttle()
checkpoint_shuttle.checkpoint_slot = checkpoint_statement.checkpoint_slot
checkpoint_shuttle.checkpoint_proof = checkpoint_proof
output("Sending checkpoint Shuttle to Successor Replica: " + str(self.successorReplica) + " from " + str(self))
send(('forward_checkpoint_shuttle', self, checkpoint_shuttle), to = self.successorReplica)
else:
output("No checkpointing as Replica " + str(self) + " is immutable now")
def check_validity_of_checkpoint_proof(checkpoint_proof):
checkpoint_set = set()
if len(checkpoint_proof) < (int(len(replicaPublicKeys)/2) + 1):
return False
for i in range(0, len(checkpoint_proof)):
verification = True
checkpoint_statement = ""
try:
checkpoint_statement = utils.verifySignature(checkpoint_proof[i], self.replicaPublicKeys[i]).decode('UTF-8')
except Exception:
verification = False
if verification == True:
checkpoint_set.add(checkpoint_statement)
if len(checkpoint_set) > (int(len(replicaPublicKeys)/2) + 1):
return False
return True
def receive(msg = ('forward_checkpoint_shuttle', replica, checkpoint_shuttle)):
output("Received Checkpoint shuttle at replica: " + str(self) + " from replica: " + str(replica))
if self.state == State.ACTIVE.value:
self.checkpoints += 1
##Failure Trigger##########
failurekey = "checkpoint("+str(self.checkpoints)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
# print("Failure key" + failurekey)
# print("failures " + str(self.failures))
# print("Injections at replica during forwarding checkpoint"+ str(self) +" " + str(self.failureInjections))
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " during sending the checkpoint shuttle forward")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "increment_slot()" in self.failureInjections : ##Increment Slot Message
output("Increment Slot Failure Triggered at replica: " + str(self))
self.failureInjections["increment_slot()"] -=1
if self.failureInjections["increment_slot()"] == 0:
self.failureInjections.pop("increment_slot()")
if self.isHeadFlag:
self.slotNo = self.slotNo + 1
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
#validate checkpoint proof
if True:
output("Checkpoint shuttle verified at replica: " + str(self))
checkpoint_statement = CheckpointStatement()
checkpoint_statement.checkpoint_slot = checkpoint_shuttle.checkpoint_slot
#output("Running State: " + str(self.runningstate))
checkpoint_statement.running_state = utils.getHash(str(self.runningstateForCheckpoint))
#Sign Checkpoint Statement and add to checkpoint proof
signed_checkpoint_statement = utils.getSignedStatement(self.replicaPrivateKey, str(checkpoint_statement))
if self.isTailFlag == True:
checkpoint_proof = checkpoint_shuttle.checkpoint_proof
checkpoint_proof.append(signed_checkpoint_statement)
output("Checkpoint proof completed at Replica: " + str(self))
#Initialize completed checkpoint shuttle
completed_checkpoint_shuttle = CheckpointShuttle()
completed_checkpoint_shuttle.checkpoint_proof = checkpoint_proof
####Failure Injections#####
if "drop_checkpt_stmts()" in self.failureInjections : ##Drop Checkpoint Statements Message
output("Drop Checkpoint Operation Failure Triggered at replica: " + str(self))
self.failureInjections["drop_checkpt_stmts()"] -=1
if self.failureInjections["drop_checkpt_stmts()"] == 0:
self.failureInjections.pop("drop_checkpt_stmts()")
completed_checkpoint_shuttle.checkpoint_proof = completed_checkpoint_shuttle.checkpoint_proof[(int(len(self.replicaPublicKeys)/2) + 2):]
#######################################################
completed_checkpoint_shuttle.checkpoint_slot = checkpoint_shuttle.checkpoint_slot
#Remove prefix of History From Tail
output("Truncating history for replica: " + str(self) + " upto Slot:" + str(completed_checkpoint_shuttle.checkpoint_slot-1))
self.historyoforderproofs = self.historyoforderproofs[self.checkpt_interval:]
#add checkpoint proof to its history
self.historyofcheckpointproofs.append(checkpoint_proof)
#Send Completed Checkpoint Shuttle backward
output("Sending Completed Checkpoint Shuttle backward to Replica: " + str(self.predecessorReplica) + " from replica: " + str(self))
send(('completed_checkpoint_shuttle', self, completed_checkpoint_shuttle), to = self.predecessorReplica)
else:
checkpoint_proof = checkpoint_shuttle.checkpoint_proof
checkpoint_proof.append(signed_checkpoint_statement)
output("Sending checkpoint Shuttle to Successor Replica: " + str(self.successorReplica) + " from " + str(self))
send(('forward_checkpoint_shuttle', self, checkpoint_shuttle), to = self.successorReplica)
else:
output("No forwarding of checkpointing as Replica " + str(self) + " is immutable now")
def receive(msg = ('completed_checkpoint_shuttle', replica, completed_checkpoint_shuttle)):
output("Received Completed Checkpoint shuttle at replica: " + str(self) + " from replica: " + str(replica))
if self.state == State.ACTIVE.value:
self.completed_checkpoints += 1
##Failure Trigger##########
failurekey = "completed_checkpoint("+str(self.completed_checkpoints)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
# print("Failure key" + failurekey)
# print("failures " + str(self.failures))
# print("Injections at replica during forwarding checkpoint"+ str(self) +" " + str(self.failureInjections))
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " during sending the completed checkpoint shuttle backward")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "increment_slot()" in self.failureInjections : ##Increment Slot Message
output("Increment Slot Failure Triggered at replica: " + str(self))
self.failureInjections["increment_slot()"] -=1
if self.failureInjections["increment_slot()"] == 0:
self.failureInjections.pop("increment_slot()")
if self.isHeadFlag:
self.slotNo = self.slotNo + 1
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
#validate completed checkpoint proof
if check_validity_of_checkpoint_proof(completed_checkpoint_shuttle.checkpoint_proof):
output("Completed Checkpoint shuttle verified at replica: " + str(self))
#Remove prefix of History From Replicas
output("Truncating history for replica: " + str(self) + " upto Slot:" + str(completed_checkpoint_shuttle.checkpoint_slot-1))
self.historyoforderproofs = self.historyoforderproofs[self.checkpt_interval:]
#add checkpoint proof to its history
self.historyofcheckpointproofs.append(completed_checkpoint_shuttle.checkpoint_proof)
if self.isHeadFlag == True:
output("Checkpointing Process Completed at replica: " + str(self))
else:
####Failure Injections#####
if "drop_checkpt_stmts()" in self.failureInjections : ##Drop Checkpoint Statements Message
output("Drop Checkpoint Failure Triggered at replica: " + str(self))
self.failureInjections["drop_checkpt_stmts()"] -=1
if self.failureInjections["drop_checkpt_stmts()"] == 0:
self.failureInjections.pop("drop_checkpt_stmts()")
completed_checkpoint_shuttle.checkpoint_proof = completed_checkpoint_shuttle.checkpoint_proof[(int(len(self.replicaPublicKeys)/2) + 2):]
# print(str(completed_checkpoint_shuttle.checkpoint_proof))
#######################################################
output("Sending completed checkpoint Shuttle to Predecessor Replica: " + str(self.predecessorReplica) + " from " + str(self))
send(('completed_checkpoint_shuttle', self, completed_checkpoint_shuttle), to = self.predecessorReplica)
else:
output("Sending Reconfiguration Request to Olympus due to invalid checkpoint proof from Replica " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
else:
output("No backward sending of checkpointing as Replica " + str(self) + " is immutable now")
def execute_retransmitted_request_at_head(operation_object, client, signed_workload):
requestId = operation_object.requestId
if requestId in self.inProcessRequestIds and self.inProcessRequestIds[requestId] ==0 :
(result, shuttle) = self.requestIdToResultShuttle[requestId]
send(('Retransmitted Response',result, operation_object, shuttle.result_proof, self, "VALID", signed_workload), to = client)
elif requestId in self.inProcessRequestIds and self.inProcessRequestIds[requestId] ==1:
if await((requestId in self.inProcessRequestIds) and (self.inProcessRequestIds[requestId] == 0)):
(result, shuttle) = self.requestIdToResultShuttle[requestId]
send(('Retransmitted Response',result, operation_object, shuttle.result_proof, self, "VALID", signed_workload), to = client)
elif timeout(head_timeout):
output("Timeout detected at head " + str(self) + " for requestId: " + requestId)
output("Sending Reconfiguration Request to Olympus from Head " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
elif requestId not in self.inProcessRequestIds:
self.slotNo = self.slotNo + 1
operation_object.slotNo = self.slotNo
shuttle = Shuttle()
shuttle.operation = operation_object
execute_operation_of_client(client, shuttle, signed_workload)
if await((requestId in self.inProcessRequestIds) and (self.inProcessRequestIds[requestId] == 0)):
(result, shuttle) = self.requestIdToResultShuttle[requestId]
send(('Retransmitted Response',result, operation_object, shuttle.result_proof, self,"VALID", signed_workload), to = client)
elif timeout(head_timeout):
output("Timeout detected at head " + str(self) + " for requestId: " + requestId)
output("Sending Reconfiguration Request to Olympus from Head " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
def receive(msg =('Retransmit Request To Replicas',operation_object, client, signed_workload), from_ = p):
output("Received retransmitted request of client: "+ str(client) + " for operation: "+ str(operation_object) + " on replica: " + str(self) + " for requestId: " + operation_object.requestId)
requestId = operation_object.requestId
if requestId not in self.requestIdToForwardedRequests:
self.requestIdToForwardedRequests[requestId] = 1
else:
return
if self.state == State.ACTIVE.value:
if requestId in self.requestIdToResultShuttle:
(result, shuttle) = self.requestIdToResultShuttle[requestId]
send(('Retransmitted Response',result, operation_object, shuttle.result_proof, self, "VALID", signed_workload), to = client)
else:
if isHeadFlag == False:
send(('Retransmit To Head', operation_object, client, signed_workload), to = head)
if await(((requestId in self.inProcessRequestIds) and (self.inProcessRequestIds[requestId] == 0))):
(result, shuttle) = self.requestIdToResultShuttle[requestId]
send(('Retransmitted Response',result, operation_object, shuttle.result_proof, self, "VALID", signed_workload), to = client)
elif timeout(nonhead_timeout):
output("Timeout detected at non-head " + str(self) + " for requestId: " + requestId)
output("Sending Reconfiguration Request to Olympus from Non-Head " + str(self))
send(('Reconfiguration request from replica', self), to = olympus)
else:
##For handling just one retrasmitted request
execute_retransmitted_request_at_head(operation_object, client, signed_workload)
elif self.state == State.IMMUTABLE.value:
output("Replica " + str(self) + " is immutable now")
send(('Retransmitted Response', None, operation_object, None, self, "ERROR", signed_workload), to = client)
def receive(msg = ('Retransmit To Head' ,operation_object, client, signed_workload), from_ = p):
output("Forwarded request received on head:" + str(self) + " for operation:" + str(operation_object) + " from replica: " + str(p))
if self.state == State.ACTIVE.value:
requestId = operation_object.requestId
##For handling just one retrasmitted request
if requestId not in self.requestIdToForwardedRequests:
self.requestIdToForwardedRequests[requestId] = 1
cid = requestId.split(':')[0]
try:
self.forwardedmessageforclient[cid]+=1
except KeyError:
self.forwardedmessageforclient[cid]=0
m = self.forwardedmessageforclient[cid]
##Failure Trigger##########
failurekey = "forwarded_request("+str(cid[1:])+","+str(m)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " when receiving the forwarded request from some replica at head")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return
if "increment_slot()" in self.failureInjections : ##Increment Slot Message
output("Increment Slot Failure Triggered at replica: " + str(self))
self.failureInjections["increment_slot()"] -=1
if self.failureInjections["increment_slot()"] == 0:
self.failureInjections.pop("increment_slot()")
if self.isHeadFlag:
self.slotNo = self.slotNo + 1
if "extra_op()" in self.failureInjections : ##Extra Operation Message
output("Extra Operation Failure Triggered at replica: " + str(self))
self.failureInjections["extra_op()"] -=1
if self.failureInjections["extra_op()"] == 0:
self.failureInjections.pop("extra_op()")
execute_operation("put", "a", "a")
#######################################################
execute_retransmitted_request_at_head(operation_object, client, signed_workload)
def receive(msg = ('Become Active', head, tail, id, replicas), from_ = olympus, at=(yieldInitializeHistory,)):
output("Received become active request from olympus:" + str(olympus) + " on replica: " + str(self))
self.state = State.ACTIVE.value
self.head = head
self.tail = tail
index = int(id[1:])
self.Id = id
if index == 0 :
self.isHeadFlag = True
self.successorReplica = replicas[1]
elif index == len(replicas) - 1:
self.isTailFlag = True
self.predecessorReplica = replicas[index-1]
else :
self.successorReplica = replicas[index+1]
self.predecessorReplica = replicas[index-1]
send(('Initialize History Done', self), to = olympus)
#Wedge Request handling section
def receive(msg = ('Wedge request'), from_ = olympus):
output("Recieved wedge request from olympus on replica: " + str(self))
self.wedge_request +=1
if True:
self.state = State.IMMUTABLE.value
history_to_send = copy.deepcopy(self.historyoforderproofs)
##Failure Trigger##########
failurekey = "wedge_request("+str(self.wedge_request)+")"
if failurekey in self.failures:
try:
self.failureInjections[self.failures[failurekey]] +=1
except KeyError:
self.failureInjections[self.failures[failurekey]] = 1
###########################
####Failure Injections called just after triggers #####
if any(key.startswith('sleep') for key in self.failureInjections): ##Sleep
sleep = [ key for key in self.failureInjections.keys() if 'sleep' in key][0]
output("Sleep Time Failure Triggered at replica: " + str(self))
self.failureInjections[sleep] -=1
if self.failureInjections[sleep] == 0:
self.failureInjections.pop(sleep)
sleeptime = sleep[sleep.find('(')+1:sleep.find(')')]
time.sleep(int(sleeptime))
if "crash()" in self.failureInjections : ##Crash Replica
output("Killing Replica Failure Triggered at replica: " + str(self))
os._exit(-1)
return
if "drop()" in self.failureInjections : ##Drop Message
output("Drop Failure Triggered at replica: " + str(self) + " when receiving the wedge request from olympus")
self.failureInjections["drop()"] -=1
if self.failureInjections["drop()"] == 0:
self.failureInjections.pop("drop()")
return