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byzantine_generals.py
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byzantine_generals.py
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import collections
import numpy as np
import itertools
class General:
def __init__(self, g_id, loyalty, post=None):
self.g_id = g_id
self.loyalty = loyalty
self.post = post
self.allMessagesReceived = []
self.previousRoundMessages = []
self.messages = []
def send_message(self, generalToSend, c_mes, round):
mStr = str(self.g_id) + "," + c_mes
if self.loyalty == "T":
ord = mStr[-1]
if round == 0:
if ord == "A":
new_ord = "R"
elif ord == "R":
new_ord = "A"
mStr = mStr.replace(ord, new_ord)
generalToSend.receive_message(mStr)
#print("General {} (loyalty {}) sent message {} to General {}".format(self.g_id, self.loyalty, mStr, generalToSend.g_id))
def cm_send_message(self, generalToSend, order):
mStr = str(self.g_id) + "," + order
generalToSend.receive_message(mStr)
def receive_message(self, messageStr):
self.messages.append(messageStr)
self.allMessagesReceived.append(messageStr)
# Example Inputs
NUM_OF_LEIUTENANTS = 6
COMMANDER_LOYALTY = "L"
loyalties = "LTLLTL"
'''
NUM_OF_LEIUTENANTS = 3
COMMANDER_LOYALTY = "L"
loyalties = "LLT"
'''
'''
NUM_OF_LEIUTENANTS = 9
COMMANDER_LOYALTY = "T"
loyalties = "LLLLTTLLL"
'''
traitorCount = (COMMANDER_LOYALTY + loyalties).count("T")
if traitorCount > (NUM_OF_LEIUTENANTS + 1)*2/3:
raise ValueError("Assumption Failure: Too many traitors!")
print(traitorCount)
# Initialize Commander
commander = General(0, COMMANDER_LOYALTY, "CM")
# Initialize Generals
generals = []
generals.append(commander)
for i in range(NUM_OF_LEIUTENANTS):
generals.append(General(i+1, loyalties[i], "LT"))
print("Initializing Generals: Starting State ->")
for g in generals:
print(g.__dict__)
print("Total Generals: ", NUM_OF_LEIUTENANTS+1, " | ","Commander Loyalty: ", generals[0].loyalty, " | Traitor Lieutenants: ", loyalties.count("T"))
#Oral Message Algorithm
print("Oral Message Algorithm Starting: Phase 1")
rounds = traitorCount
#total rounds is equal to number of traitors + 1, use <= if using while with rounds var
#Phase 1: Commander's Turn
#print(generals[0].__dict__)
#send initial set of messages including actual order
for gens in generals[1:]:
#print(gens.__dict__)
if commander.loyalty == "L":
#commander is loyal, send same message to all LTs
order = "A"
commander.cm_send_message(gens, order)
elif commander.loyalty == "T":
#commander is traitor, send different message to half
n = len(generals[1:])//2
halfgens1 = generals[1:n]
halfgens2 = generals[n:]
for g in halfgens1:
commander.cm_send_message(g, "A")
for g in halfgens2:
commander.cm_send_message(g, "R")
for g in generals:
g.previousRoundMessages += g.messages
g.messages = []
print(g.__dict__)
for r in range(rounds):
print("\n Round: ",r+1 , "\n \n")
for g in generals:
for m in g.previousRoundMessages:
#print("Message Sent: ", m)
for other_g in generals:
if g.post == "CM" or other_g.post == "CM": continue
if g.g_id == other_g.g_id: continue
if str(other_g.g_id) in m:
#print("Message: ", m, " | Id Found: ", other_g.g_id)
continue
g.send_message(other_g, m, r)
for g in generals:
g.previousRoundMessages = g.messages
g.messages = []
print("General {}: ".format(g.g_id))
print(g.__dict__, "\n")
# Format messages to match assignment
for g in generals[1:]:
res = [x[-3::-1] + x[-2:] for x in g.allMessagesReceived if len(x) >= 3]
g.allMessagesReceived = []
g.allMessagesReceived += res
#Phase 2: Consensus
print('Phase 2: Consensus \n')
# Message Grouping
for g in generals[1:]:
util_func = lambda x: x[0:5]
temp = sorted(g.allMessagesReceived, key = util_func)
res = [list(ele) for i, ele in itertools.groupby(temp, util_func)]
#print(g.allMessagesReceived)
#print(res)
consensusList = [] # 'A', 'R'
for r in res:
print(r)
rConsensusCommands = [s[-1] for s in r]
print(rConsensusCommands)
res_con = collections.Counter(rConsensusCommands)
aCons, rCons = res_con['A'], res_con['R']
#print("Consensus A: ", aCons, " Consensus R: ", rCons)
if aCons > rCons:
consensusList.append('A')
else:
consensusList.append('R')
superConsensus = collections.Counter(consensusList)
saCons, srCons = superConsensus['A'], superConsensus['R']
if saCons > srCons:
g.consensus = 'A'
else:
g.consensus = 'R'
#print(consensusList)
print("\n General {} Consensus: {}".format(g.g_id, g.consensus))
print("#########################")
'''
# Naive Consensus (takes consensus over all messages received)
for g in generals[1:]:
consensusCommands = [s[-1] for s in g.allMessagesReceived]
#print("General {} (Loyalty {}) Consensus Str: {}".format(g.g_id, g.loyalty, consensusCommands))
cons = collections.Counter(consensusCommands)
aCons, rCons = cons['A'], cons['R']
if aCons > rCons:
g.consensus = "A"
print("General {} (Loyalty {}) Consensus Reached. Command: {}".format(g.g_id, g.loyalty, "A"))
else:
g.consensus = "R"
print("General {} (Loyalty {}) Consensus Reached. Command: {}".format(g.g_id, g.loyalty, "R"))
'''
print("Final Consensus ->")
for g in generals[1:]:
print("General {} (Loyalty {}) Command: {}".format(g.g_id, g.loyalty, g.consensus))