def resolve(self):
"""Checks all peer nodes' blockchains and replaces the local one with longer valid ones."""
# Below: winner chain to hold the value of the chain we'd use
winner_chain = self.chain
# Below: replace varaible to keep track of whether the winner_chain variable changed
replace = False
for node in self.__peer_nodes:
url = f"http://{node}/chain"
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [
Block(block['index'], block['previous_hash'], [
Transaction(tx['sender'], tx['recipient'],
tx['signature'], tx['amount'])
for tx in block['transactions']
], block['proof'], block['timestamp'])
for block in node_chain
]
node_chain_length = len(node_chain)
print(node_chain_length)
print(Verification.verify_chain(node_chain))
local_chain_length = len(winner_chain)
if node_chain_length > local_chain_length and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflict = False
self.chain = winner_chain
if replace:
self.__open_transactions = []
self.save_data()
return replace
def listen_for_input(self):
while True:
user_input = self.get_user_choice()
if user_input == '1':
tx_data = self.get_transaction_value()
#unpacking tuple
recipient, amount = tx_data
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient,
self.wallet.public_key,
signature, amount):
print('Transaction Added')
else:
print('Transaction Failed')
#print(open_transactions)
elif user_input == '2':
if not self.blockchain.mine_block():
print('No Wallet. Mining Failed')
elif user_input == '3':
self.display_blockchain()
elif user_input == '4':
if Verification.verify_chain(self.blockchain.chain):
print('\nThe Blockchain is Valid')
else:
print('\nThe Blockchain has been compromised')
break
elif user_input == '5':
if Verification.verify_transactions(
self.blockchain.get_open_transaction,
self.blockchain.get_balances):
print('Valid Transactions')
else:
print('Invalid Transactions')
elif user_input == '6':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_input == '7':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_input == '8':
self.wallet.save_keys()
else:
break
print('New Balance for {} : {:10.2f}'.format(
self.wallet.public_key, self.blockchain.get_balances()))
if not Verification.verify_chain(self.blockchain.chain):
print('\nThe Blockchain has been compromised')
break
def resolve(self):
winner_chain = self.chain
replace = False
for node in self.__peer_nodes:
url = "http://{}/chain".format(node)
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [
Block(block["index"], block["previous_hash"], [
Transaction(tx["sender"], tx["recipient"],
tx["signature"], tx["amount"])
for tx in block["transactions"]
], block["proof"], block["timestamp"])
for block in node_chain
]
# node_chain.transactions = [Transaction(tx["sender"], tx["recipient"], tx["signature"], tx["amount"]) for tx in node_chain["transactions"]]
node_chain_length = len(node_chain)
local_chain_length = len(self.chain)
if node_chain_length > local_chain_length and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.chain = winner_chain
if replace:
self.__open_transactions = []
self.save_data()
return replace
def listen_for_input(self):
waiting_for_input = True
# A while loop for the user input interface
# It's a loop that exits once waiting_for_input becomes False or when break is called
while waiting_for_input:
print("Please choose:")
print("1: Add a new transaction value")
print("2: Mine a new block")
print("3: Output the blockchain blocks")
print("4: Check transaction validity")
print("5: Create wallet")
print("6: Load wallet")
print("7: Save wallet keys")
print("q: Quit")
user_choice = self.get_user_choice()
if "1" == user_choice:
tx_data = self.get_transaction_value()
recipient, amount = tx_data
# Add the transaction amount to the blockchain
signature = self.wallet.sign_transaction(self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient, self.wallet.public_key, signature, amount=amount):
print("Added transaction!")
else:
print("Transaction failed!")
print(self.blockchain.get_open_transactions())
elif "2" == user_choice:
if not self.blockchain.mine_block():
print("Mining failed. Got no wallet?")
elif "3" == user_choice:
self.print_blockchain_elements()
elif "4" == user_choice:
if Verification.verify_transactions(self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print("All transactions are valid")
else:
print("There are invalid transactions")
elif "5" == user_choice:
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif "6" == user_choice:
self.wallet.load_key()
self.blockchain = Blockchain(self.wallet.public_key)
elif "7" == user_choice:
self.wallet.save_keys()
elif "q" == user_choice:
# This will lead to the loop to exist because it's running condition becomes False
waiting_for_input = False
else:
print("Input was invalid, please pick a value from the list!")
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print("Invalid blockchain!")
# Break out of the loop
break
print("Balance of '{}': {:6.2f}".format(self.wallet.public_key, self.blockchain.get_balance()))
else:
print("User left!")
print("Done!")
def resolve(self):
"""Checks all peer nodes' blockchains and replaces the local one with longer valid ones."""
# Initialize the winner chain with the local chain
winner_chain = self.chain
replace = False
for node in self.__peer_nodes:
url = 'http://{}/chain'.format(node)
try:
# Send a request and store the response
response = requests.get(url)
# Retrieve the JSON data as a dictionary
node_chain = response.json()
# Convert the dictionary list to a list of block AND transaction objects
node_chain = [Block(block['index'], block['previous_hash'], [Transaction(
tx['sender'], tx['recipient'], tx['signature'], tx['amount']) for tx in block['transactions']],
block['proof'], block['timestamp']) for block in node_chain]
node_chain_length = len(node_chain)
local_chain_length = len(winner_chain)
# Store the received chain as the current winner chain if it's longer AND valid
if node_chain_length > local_chain_length and Verification.verify_chain(node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
# Replace the local chain with the winner chain
self.chain = winner_chain
if replace:
self.__open_transactions = []
self.save_data()
return replace
def resolve(self):
winner_chain = self.get_chain()
whether_replace_local_chain = False
for node in self.__peer_nodes:
url = "http://{}/chain".format(node)
try:
response = requests.get(url)
peer_chain = response.json()
peer_chain = [Block(block["index"], block["previous_hash"], block["transactions"], block["proof"], block["time_stamp"]) for block in peer_chain]
for elem in peer_chain:
elem.transactions = [Transaction(tx["sender"], tx["recipient"], tx["signature"], tx["amount"]) for tx in elem.transactions]
peer_chain_length = len(peer_chain)
local_chain_length = len(winner_chain)
whether_peer_chain_longer = peer_chain_length > local_chain_length
whether_peer_chain_valid = Verification.verify_chain(peer_chain)
if whether_peer_chain_longer and whether_peer_chain_valid:
winner_chain = peer_chain[:]
whether_replace_local_chain = True
except requests.exceptions.ConnectionError:
print("Connection failed with node : %s"%node)
continue
self.resolve_conflicts = False
self.__chain = winner_chain
if whether_replace_local_chain:
self.__open_transactions = []
self.save_data()
return whether_replace_local_chain
def listen_for_input(self):
"""Starts the node and waits for user input."""
waiting_for_input = True
# A while loop for the user input interface
# It's a loop that exits once waiting_for_input becomes False or when break is called
while waiting_for_input:
print('Please choose')
print('1: Add a new transaction value')
print('2: Mine a new block')
print('3: Output the blockchain blocks')
print('4: Check transaction validity')
print('5: Create wallet')
print('6: Load wallet')
print('7: Save keys')
print('q: Quit')
user_choice = self.get_user_choice()
if user_choice == '1':
tx_data = self.get_transaction_value()
recipient, amount = tx_data
# Add the transaction amount to the blockchain
signature = self.wallet.sign_transaction(self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient, self.wallet.public_key, signature, amount=amount):
print('Added transaction!')
else:
print('Transaction failed!')
print(self.blockchain.get_open_transactions())
elif user_choice == '2':
if not self.blockchain.mine_block():
print('Mining failed. Got no wallet?')
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(self.blockchain.get_open_transactions(), self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There are invalid transactions')
elif user_choice == '5':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '6':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '7':
self.wallet.save_keys()
elif user_choice == 'q':
# This will lead to the loop to exist because it's running condition becomes False
waiting_for_input = False
else:
print('Input was invalid, please pick a value from the list!')
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print('Invalid blockchain!')
# Break out of the loop
break
print('Balance of {}: {:6.2f}'.format(self.wallet.public_key, self.blockchain.get_balance()))
else:
print('User left!')
print('Done!')
def resolve(self):
winner_chain = self.chain
replace = False # whether our current chain is getting replaced, initially is False
for node in self.__peer_nodes:
url = 'http://{}/chain'.format(node)
try:
response = requests.get(url)
node_chain = response.json() # list of block dict
# create list of block object with a list of dict transaction
node_chain = [
Block(block['index'], block['previous_hash'], [
Transaction(tx['sender'], tx['recipient'],
tx['signature'], tx['amount'])
for tx in block['transactions']
], block['proof'], block['timestamp'])
for block in node_chain
]
node_chain_length = len(node_chain)
local_chain_length = len(winner_chain)
if node_chain_length > local_chain_length and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True # if replace is True, we can assume our transactions are incorrect
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.chain = winner_chain
if replace:
self.__open_transactions = [
] # if chain is replaced, set local open tx to []
self.save_data()
return replace
def resolve(self):
winner_chain = self.chain
replace = False
for node in self.peer_nodes:
try:
resp = requests.get(f'http://{node}/chain')
node_chain = resp.json()
node_chain = [
Block(block['index'], block['previous_hash'],
[Transaction(tx['sender'], tx['recipient'], tx['signature'], tx['amount']) for tx in block['transactions']],
block['proof'],
block['timestamp']) for block in node_chain]
node_chain_length = len(node_chain)
local_chain_length = len(self.chain)
if node_chain_length > local_chain_length and Verification.verify_chain(self.get_balance, self.difficulty, self.chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.chain = winner_chain
if replace:
self.open_transactions = []
self.save_data()
return replace
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print('Please choose')
print('1: Add a new transaction value')
print('2: Mine a new block')
print('3: Output the blockchain blocks')
print('4: Check transaction validity')
print('5: Create Wallet')
print('6: Load Wallet')
print('7: Save Keys')
print('q: Quit')
user_choice = self.get_user_choice()
if user_choice == '1':
tx_data = self.get_transaction_value()
recipient, amount = tx_data
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient,
self.wallet.public_key,
signature,
amount=amount):
print('Added transaction!')
else:
print('Transaction failed!')
print(self.blockchain.get_last_blockchain_value)
elif user_choice == '2':
if not self.blockchain.mine_block():
print('I left my wallet in El Segundo')
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.get_open_transactions,
self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There are invalid transactions')
elif user_choice == '5':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '6':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '7':
self.wallet.save_keys()
elif user_choice == 'q':
waiting_for_input = False
else:
print('Input was invalid, please pick a value from the list!')
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print('Invalid blockchain!')
break
print('Balance of {}: {:6.2f}'.format(
self.wallet.public_key, self.blockchain.get_balance()))
else:
print('User left!')
print('Done!')
def resolve(self):
winner_chain = self.chain
replace = False
for node in self.__peer_nodes:
url = 'http://{}/chain'.format(node)
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [
self.get_block_object_from_json(block)
for block in node_chain
]
node_chain_len = len(node_chain)
local_chain_len = len(self.chain)
if node_chain_len > local_chain_len and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.chain = winner_chain
if replace:
self.__open_transactions = []
self.save_data()
return replace
def resolve(self):
winner_chain = self.chain
replace = False
for node in self.__peer_nodes:
url = 'http://{}/chain'.format(node)
try:
response = requests.get(url)
node_chain = response.json()
block_transactions = [
Transaction(tx['sender'], tx['recipient'], tx['signature'],
tx['amount'])
for tx in node_chain['transactions']
]
node_chain = [
Block(block['index'], block['previous_hash'],
block_transactions, block['proof'],
block['timestamp']) for block in node_chain
]
node_chain_length = len(node_chain)
local_chain_length = len(winner_chain)
if node_chain_length > local_chain_length and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.chain = winner_chain
if replace:
self.__open_transactions = []
self.save_data()
return replace
def resolve(self):
winner_chain = self.chain
replace = False ## Control whether current chain is being replaced
# Get a snapshot of blockcahin on every peer node to check which peer node has which blockchain & which one is correct.
for node in self.__peer_nodes:
url = 'http://{}/chain'.format(node)
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [
Block(block['index'], block['previous_hash'], [
Transaction(tx['sender'], tx['recipient'],
tx['signature'], tx['amount'])
for tx in block['transactions']
], block['proof'], block['timestamp'])
for block in node_chain
]
node_chain_length = len(node_chain)
local_chain_length = len(winner_chain)
if node_chain_length > local_chain_length and Verification.verify_chain(
node_chain):
# if chain of peer node is longer and valid, use it as local chain
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue # avoids break down code for node offline that cant be reached
self.resolve_conflicts = False
self.chain = winner_chain
if replace:
self.__open_transactions = []
self.save_data()
return replace
def resolve(self):
# we are looping over, so each time we get a new one we assign it here
winner_chain = self.__chain
# checking if our current chain has been replaced to clear the open transactions
replace = False
for node in self.__peer_nodes:
url = "http://{}/chain".format(node)
try:
response = requests.get(url)
# this is a list
node_chain = response.json()
# we are converting block to an object
# now we are converting transactions to object
node_chain = [
Block(block['index'], block['previous_hash'], [
Transaction(tx['sender'], tx['recipient'],
tx['signature'], tx['amount'])
for tx in block['transactions']
], block['proof'], block['timestamp'])
for block in node_chain
]
node_chain_length = len(node_chain)
local_chain_length = len(winner_chain)
if node_chain_length > local_chain_length and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
# we resolved the conflicts so it is False now
self.resolve_conflicts = False
if replace:
self.__open_transactions = []
self.save_data()
return replace
def resolve(self):
winner_chain = self.__chain
replace = False
for node in self.__peers_nodes:
url = f'http://{node}/chain'
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [
Block.dict_to_object(block)
for block in node_chain['blockchain']
]
node_chain_len = len(node_chain)
local_chain_len = len(winner_chain)
if node_chain_len > local_chain_len and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.__chain = winner_chain
if replace:
self.__open_transactions.clear()
return replace
def resolve(self):
#Resolves conflict when two copies of the blockchain don't match
#the blockchain with the longer length persists
winner_chain = self.__chain
replace = False
for node in self.__peer_nodes:
url = 'http://{}/chain'.format(node)
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [
Block(block['index'], block['previous_hash'], [
Transaction(tx['sender'], tx['recipient'],
tx['signature'], tx['amount'])
for tx in block['transactions']
], block['proof'], block['timestamp'])
for block in node_chain
]
node_chain_length = len(node_chain)
local_chain_length = len(winner_chain)
if node_chain_length > local_chain_length and Verification.verify_chain(
node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.chain = winner_chain
#clear the open transactions list of the chain with the shorter length
if replace:
self.__open_transactions = []
self.save_data()
return replace
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print('\n Please choose')
print('1: Add a new transaction value')
print('2: Mine a new block')
print('3: Output the blockchain blocks')
print('4: Check transactions validity')
print('5: Create wallet')
print('6: Load wallet')
print('7: Save keys')
print('q: Quit')
user_choice = self.get_user_choice()
if user_choice == '1':
recipient, amount = self.get_transaction_value()
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient,
self.wallet.public_key,
signature,
amount=amount):
print("Added transaction!")
else:
print("Transaction failed \n")
print(self.blockchain.get_open_transactions())
elif user_choice == '2':
if not self.blockchain.mine_block():
print("Mining has failed. Got no wallet?")
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print("All transactions are valid")
else:
print("There are invalid transactions")
elif user_choice == '5':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '6':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '7':
self.wallet.save_keys()
elif user_choice == 'q':
waiting_for_input = False
else:
print('Input was invalid, please pick a value from the list!')
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print('Invalid blockchain!')
break
print(
f"Balance of {self.wallet.public_key}: {self.blockchain.get_balance()}"
)
print(self.blockchain.get_balance())
else:
print('User left!')
def resolve(self):
'''
Update OLD STATE blockchain of current node to longest one from configured peer nodes
'''
winner = {
'node': None,
'chain': [],
}
for node in self.__peer_nodes:
node_url = f'http://{node}/chain'
try:
response = requests.get(node_url)
except requests.exceptions.ConnectionError:
continue
if not response.ok:
continue
remote_blockchain = response.json()
# Find longest blockchain among configured peers
if len(winner['chain']) < len(remote_blockchain):
winner['node'] = node
winner['chain'] = remote_blockchain
# Convert chain to list of Block Objects
winner['chain'] = [
self.block_as_object(block_dict) for block_dict in winner['chain']
]
if Verification.verify_chain(winner['chain'], DIFFICULTY):
# Update Blockchain
self.__chain = winner['chain']
self.save_blockchain()
# Get winner node open transactions
node = winner['node']
node_url = f'http://{node}/transactions'
try:
response = requests.get(node_url)
except requests.exceptions.ConnectionError:
print('Connection error with winner node')
# Update open transactions
if response.ok:
winner_txs = response.json()
winner_txs = self.tansactions_as_objects(winner_txs)
self.__open_transactions = winner_txs
else:
self.__open_transactions.clear()
self.save_open_transactions()
self.resolve_conflicts = False
print('Updated current blockchain length:', len(self.__chain))
return True
return False
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print("Please Choose")
print("1: Add a new trasaction value")
print("2: Mine a new block ")
print("3: Output the blockchain blocks")
print("4: Check transaction validity")
print("5: Create wallet")
print("6: Load wallet")
print("7: save wallet keys ")
print("q: Quit")
user_choice = self.get_user_choice()
if user_choice == "1":
tx_data = self.get_transaction_value()
recipient, amount = tx_data
signature = self.wallet.sign_transactions(self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient, self.wallet.public_key, amount, signature):
print('Added Transaction')
else:
print('Transaction Failed')
print(self.blockchain.get_open_transactions())
elif user_choice == "2":
if not self.blockchain.mine_block():
print('Mining failed. Got no wallet')
elif user_choice == "3":
self.print_blockchain_element()
elif user_choice == "4":
if Verification.verify_transactions(self.blockchain.get_open_transactions(), self.blockchain.get_balance):
print("All transactions are valid")
else:
print("There are invalid transactions")
elif user_choice == "5":
self.wallet.create_keys()
self.blockchain = BlockChain(self.wallet.public_key)
elif user_choice == "6":
self.wallet.load_keys()
self.blockchain = BlockChain(self.wallet.public_key)
elif user_choice == "7":
if self.wallet.public_key != None and self.wallet.private_key != None:
self.wallet.save_keys()
elif user_choice == "q":
waiting_for_input = False
else:
print("Invalid input. Please select a value from the list")
if not Verification.verify_chain(self.blockchain.get_chain()):
print("Invalid blockchain")
break
print(
f'Balance of {self.wallet.public_key}: {self.blockchain.get_balance():6.2f}')
else:
print("User left")
print('Done')
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print("Please choose:")
print("1: Add a new transaction value")
print("2: Min a new block")
print("3: Output the blockchain blocks")
print("4: Check transaction validity")
print("5: Create Wallet")
print("6: Load Wallet")
print("7: Save Keys")
print("q: To quit")
user_choice = self.get_user_choice()
if (user_choice == "1"):
tx_data = self.get_transaction_value()
recipient, amount = tx_data
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient,
self.wallet.public_key,
signature,
amount=amount):
print("Added transaction!")
else:
print("Transaction failed")
print(self.blockchain.get_open_transactions())
elif (user_choice == "2"):
if not self.blockchain.mine_block():
print("Mining failed. Got no Wallet?")
elif (user_choice == "3"):
self.print_blockchainelements()
elif (user_choice == "4"):
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print("All transactions are valid")
else:
print("A transaction is invalid")
elif (user_choice == "5"):
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif (user_choice == "6"):
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif (user_choice == "7"):
self.wallet.save_keys()
elif (user_choice == "q"):
waiting_for_input = False
else:
print("Input was invalid, please pick a value from the list")
if Verification.verify_chain(self.blockchain.chain) == False:
print("invalid blockchain")
waiting_for_input = False
print('Balance of {}: {:6.2f}'.format(
self.wallet.public_key, self.blockchain.get_balance()))
else:
print("User left!")
print("Done")
def UI(self):
while self.waiting_for_input:
print('Enter Choice')
print('1:Add transaction')
print('2:Mine bLock')
print('3: Create Wallet')
print('4: Check Transaction valididty: ')
print('5:Print bocks')
print('6: Load Wallet')
print('7: Save Keys')
print("q:Quit")
user_choice = self.get_user_choice()
if user_choice == '1':
tx_data = self.get_transaction_value()
receipent, amount = tx_data
signature = self.wallet.sign_transaction(
self.wallet.public_key, receipent, amount)
if self.blockchain.add_transaction(
receipent=receipent,
sender=self.wallet.public_key,
signature=signature,
amount=amount):
print("Successful")
else:
print("Failed")
# print(open_transaction)
elif user_choice == '2':
if not self.blockchain.mine_block():
print("Mining Failed")
elif user_choice == '3':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.get_open_transaction(),
self.blockchain.get_balance):
print("Valid Transaction")
else:
print("Invalid transaction")
elif user_choice == '5':
self.print_blockchain()
elif user_choice == '6':
self.wallet.load_keys()
print('Loaded')
elif user_choice == '7':
if self.wallet.private_key is not None and self.wallet.public_key is not None:
self.wallet.save_keys()
print('Saved')
elif user_choice == 'q':
self.waiting_for_input = False
else:
print("Invalid Choice")
if not Verification.verify_chain(self.blockchain.get_chain()):
print("Invalid Blockchain")
break
print('Balance of {} : {:6.2f}'.format(
self.wallet.public_key, self.blockchain.get_balance()))
else:
print("User Left")
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print('Please choose:')
print('1: Add a new transaction value')
print('2: Mine the current block')
print('3: Ouput the blockchain blocks')
print('4: Verify transactions validitya')
print('5: Create wallet')
print('6: Load wallet')
print('7: Save keys')
print('q: Quit')
user_choice = self.get_user_choice()
if user_choice == '1':
recipient, amount = self.get_transaction_value()
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(self.wallet.public_key,
recipient, signature,
amount):
print('Transction succeeded')
else:
print('Transaction failed')
print(self.blockchain.get_open_transactions())
elif user_choice == '2':
if not self.blockchain.mine_block():
print('Mining failed. Got no wallet?')
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print('Transactions are valid')
else:
print('There is an invalid transaction')
elif user_choice == '5':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '6':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '7':
self.wallet.save_keys()
elif user_choice == 'q':
waiting_for_input = False
else:
print('Input was invalid!!')
if self.blockchain != None and (not Verification.verify_chain(
self.blockchain.chain)):
print('Invalid blockchain')
break
print('Done')
def listen_for_input(self):
waiting_for_input=True
while waiting_for_input :
print('Enter your choice :')
print('1.Make a new transaction')
print('2. Mine a new block ')
print("3.Print all the blocks")
print('4.Create wallet')
print('5.Load wallet')
print('6.Save keys')
print("7.Quit")
user_choice=input()
if user_choice=='1' :
#Take the user input and store it in a tuple
tx_data=self.get_transaction_data()
#unpack the tuple here and pass the arguments
recipient,amount=tx_data
signature=self.wallet.sign_transaction(self.wallet.public_key,recipient,amount)
#We need a named argument since sender is the second field in the function definition
if self.blockchain.add_transaction(recipient,self.wallet.public_key,signature,amount=amount) :
print("Transaction added successfully")
else :
print("Insufficient Balance of sender")
elif user_choice=='2' :
#Will fail if user does not have a wallet(public key)
if not self.blockchain.mine_block():
print('Mining failed ! Got not wallet ? ')
print('Or, One or multiple transaction were modified !')
elif user_choice=='3':
print(self.blockchain.get_chain())
elif user_choice=='4':
self.wallet.create_keys()
#Blockchain is initialised in our code only when user has a wallet
self.blockchain=Blockchain(self.wallet.public_key)
elif user_choice=='5':
self.wallet.load_keys()
self.blockchain=Blockchain(self.wallet.public_key)
elif user_choice=='6':
self.wallet.save_keys()
elif user_choice=='7' :
waiting_for_input=False
else :
print("Invalid input,please input a valid value from the choices !")
"""Check the validity of blockchain after each user operation"""
if not Verification.verify_chain(self.blockchain.get_chain()):
print('Invalid blockchain!')
# Break out of the loop
break
print('Balance of {} is {:6.2f}'.format(self.wallet.public_key,self.blockchain.get_balance()))
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print('---Choose your action---')
print('1: Add new transactin value.')
print('2: Mine a new block.')
print('3: Output the blockchain.')
print('4: Check transaction validity.')
print('5: Create wallet.')
print('6: Load wallet.')
print('7: Save wallet.')
print('q: Quit.')
user_choice = self.get_user_choice()
if user_choice == '1':
tx_data = self.get_transaction_value()
recipient, amount = tx_data
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient,
self.wallet.public_key,
signature,
amount=amount):
print('New transaction was added!')
else:
print('Transaction failed! Error.')
elif user_choice == '2':
if self.blockchain.mine_block():
print('Successfully mined.')
else:
print('Mining faled. Got no wallet.')
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print('All transactions is valid.')
else:
print('Transactions validation is faled!')
elif user_choice == '5':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '6':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '7':
self.wallet.save_keys()
elif user_choice == 'q':
waiting_for_input = False
else:
print('Invalid input. Try again.')
if not Verification.verify_chain(self.blockchain.chain):
print('ERROR! Chain is not valid!')
break
print('Balance of {}: {:6.2f}'.format(
self.wallet.public_key, self.blockchain.get_balance()))
print('Goodbye.')
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
self.print_options()
user_choice = self.get_user_choice()
if user_choice == '1':
tx_data = self.get_transaction_value()
recipient, amount = tx_data
# Add the transaction amount to the blockchain
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient,
self.wallet.public_key,
signature,
amount=amount):
print('Added transaction')
else:
print('Transaction failed!')
print(self.blockchain.get_open_transactions())
elif user_choice == '2':
if not self.blockchain.mine_block():
print('Mining failed. Got no wallet with valid keys?')
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There are invalid transactions')
elif user_choice == '5':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '6':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '7':
self.wallet.save_keys()
elif user_choice == 'q':
waiting_for_input = False
else:
print('Option not recognised!')
if not Verification.verify_chain(self.blockchain.get_chain()):
print("***Invalid blockchain!***")
break
print(
f'{self.wallet.public_key}\'s Balance is {self.blockchain.get_balance(self.wallet.public_key):6.2f}'
)
else:
#Loop is done - didn't break
print('User Left!')
print('Done!')
def listen_for_input(self):
while True:
print('Please choose')
print('1: Add a new transaction')
print('2: Print blockchain')
print('3: Quit')
print('4: Verify all transaction')
print('5: Mine a new block')
print('6: Create wallet')
print('7: Load wallet')
print('8: Save wallet')
user_choice = self.get_user_choice()
if user_choice == 1:
tx_data = self.get_transaction_value()
tx_recipient, tx_amount = tx_data
signature = self.wallet.sign_transaction(
self.wallet.public_key, tx_recipient, tx_amount)
if self.blockchain.add_transaction(tx_recipient,
self.wallet.public_key,
signature,
amount=tx_amount):
print('Added transaction!')
else:
print('Transaction failed!')
print(self.blockchain.get_open_transactions())
elif user_choice == 2:
self.print_blockchain_elements()
elif user_choice == 4:
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There are invalid transactions')
elif user_choice == 3:
break
elif user_choice == 5:
if not self.blockchain.mine_block():
print("Mining failed")
elif user_choice == 6:
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == 7:
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == 8:
self.wallet.save_keys()
else:
print('Invalid choice')
if not Verification.verify_chain(self.blockchain.chain):
print('Invalid blockchain!')
break
print('Balance of {}: {:6.2f}'.format(
self.wallet.public_key, self.blockchain.get_balance()))
print("Done!")
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print("""
Please choose:
1) Add a new transaction value
2) Mine a new block
3) Output the blockchain blocks
4) Check transaction validity
5) Create wallet
6) Load keys
7) Save keys
q: Quit
""")
user_choice = self.get_user_choice()
if user_choice == '1':
recipient, amount = self.get_transaction_value()
signature = self.wallet.sign_transaction(sender=self.wallet.public_key,
recipient=recipient,
amount=amount)
if self.blockchain.add_transaction(sender=self.wallet.public_key, recipient=recipient, amount=amount, signature=signature):
print('Added transaction')
else:
print('Transaction failed')
# print(open_transactions)
elif user_choice == '2':
if not self.blockchain.mine_block():
print("Mining failed. Got no wallet?")
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(self.blockchain.get_open_transactions(), self.blockchain.get_balance):
print('all transaction are valid')
else:
print('there are invalid transactions')
elif user_choice == '5':
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '6':
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == '7':
self.wallet.save_keys()
elif user_choice == 'q':
waiting_for_input = False
else:
print('invalid input, choose a value from the list')
print("Balance of {}: {:6.2f}".format(self.wallet.public_key, self.blockchain.get_balance()))
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print('invalid blockchain!')
break
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print("Please choose: ")
print("1: Add a new transaction value")
print("2: Mine a new block")
print("3: Output the blockchain blocks")
print("4: Check transactions validity")
print("5: Create wallet")
print("6: Load wallet")
print("7: Save keys")
print("q: Quit")
user_choice = self.get_user_choice()
if user_choice == "1":
recipient, amount = self.get_transaction_value()
signature = self.wallet.sign_transaction(
self.wallet.public_key, recipient, amount)
if self.blockchain.add_transaction(recipient=recipient, sender=self.wallet.public_key, signature=signature, amount=amount):
print("Added transaction")
else:
print("Transaction failed")
elif user_choice == "2":
if not self.blockchain.mine_block(self.wallet.public_key):
print("Mining failed. Got not wallet?")
elif user_choice == "3":
self.print_blockchain_elements()
elif user_choice == "4":
if Verification.verify_transactions(self.blockchain.get_open_transactions(), self.blockchain.get_balance):
print("All transactions are valid")
else:
print("There are invalid transactions")
elif user_choice == "5":
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == "6":
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == "7":
self.wallet.save_keys_to_file()
elif user_choice == "q":
waiting_for_input = False
else:
print("Input was invalid, please pick a value from the list!")
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print("invalid blockchain")
break
print(
f"Balance of {self.wallet.public_key}: {self.blockchain.get_balance():6.2f}")
else:
print("User left")
print("Done")
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print('Please choose')
print('1: Add a new transaction value')
print('2: Mine block')
print('3: Output the blockchain blocks')
print('4: Check transaction validity')
print('q: quit')
user_choice = self.get_user_choice()
if user_choice == '1':
tx_data = self.get_transaction_value()
# Unpacking the tuple
# Pulls out first el and stores in recipient then pulls second el and stores in amount
recipient, amount = tx_data
# Since sender = owner, we need to put amount = amount to skip the default for sender
if self.blockchain.add_transaction(recipient,
self.id,
amount=amount):
print('Added transaction!')
else:
print('Transaction failed!')
print(self.blockchain.get_open_transactions())
elif user_choice == '2':
self.blockchain.mine_block()
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
# Calling the class directly with static methods
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There are invalid transactions')
elif user_choice == 'q':
waiting_for_input = False
else:
print('Invalid input. Please pick from the menu items')
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print('Invalid blockchain!')
break
else:
print('Verfication Occurred')
# Using format method to output nice string
print('Balance of {}:{:6.2f}'.format(
self.id, self.blockchain.get_balance()))
else:
print('User left!')
print('Done!')
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print('Please choose :')
print('1: Add a new transaction value')
print('2: Mine a new block')
print('3: Output the blockchain blocks')
print('4: Check transaction validity')
print('q: Quit')
user_choice = self.get_user_choice()
if user_choice == '1':
tx_data = self.get_transaction_value()
recipient, amount = tx_data
if self.blockchain.add_transaction(recipient,
self.id,
amount=amount):
print('Added transaction')
else:
print('Transaction failed!')
print(self.blockchain.get_open_transactions())
elif user_choice == '2':
self.blockchain.mine_block()
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.open_transactions,
self.blockchain.get_balance):
print('----- All transactions are valid -----')
else:
print('----- There are invalid transactions -----')
elif user_choice == 'q':
waiting_for_input = False
else:
print('Invalid input')
if not Verification.verify_chain(self.blockchain.chain):
self.print_blockchain_elements()
print('Invalid blockchain!')
break
print('Balance of {} : {:6.2f}'.format(
self.id, self.blockchain.get_balance()))
print('Done !')
def resolve(self):
winner_chain = self.get_chain()
replace = False
for node in self.__peer_nodes:
url = "http://{}/chain".format(node)
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [Block(block['index'], block['previous_hash'], [Transaction(tx['sender'], tx['recipient'], tx['signature'], tx['amount'])
for tx in block['transactions']], block['proof'], block['timestamp']) for block in node_chain]
node_chain_length = len(node_chain)
local_chain_length = len(self.get_chain())
if node_chain_length > local_chain_length and Verification.verify_chain(node_chain):
winner_chain = node_chain
replace = True
except requests.exceptions.ConnectionError:
continue
self.resolve_conflicts = False
self.__chain = winner_chain
if replace:
self.__open_transactions = []
self.save_data()
return replace
def listen_for_input(self):
"""Starts the node and waits for user input."""
waiting_for_input = True
# A while loop for the user input interface
# It's a loop that exits once waiting_for_input becomes False or when break is called
while waiting_for_input:
print("Please enter your choice")
print("1: Add a new transaction value")
print("2: Mine Block")
print("3: Output the blockchain blocks")
print("4: Check transaction validity")
print("5: Create Wallet")
print("6: Load Wallet")
print("7: Save keys")
print("q: Quit")
user_choice = self.get_user_choice()
if user_choice == "1":
tx_data = self.get_transaction_value()
recipient, amount = tx_data
signature = self.wallet.sign_transaction(self.wallet.public_key, recipient, amount)
# Add the transaction amount to the blockchain
if self.blockchain.add_transaction(recipient, self.wallet.public_key, signature, amount=amount):
print('Added transaction!')
else:
print('Transaction failed!')
print(self.blockchain.get_open_transactions())
elif user_choice == "2":
if not self.blockchain.mine_block():
print("Mining Failed. Got no Wallet?")
elif user_choice == "3":
self.print_blockchain_blocks()
elif user_choice == "4":
# verifier = Verification()
if Verification.verify_transactions(self.blockchain.get_open_transactions(), self.blockchain.get_balances):
print("All transactions are valid!")
else:
print("There are some transactions failed!")
elif user_choice == "5":
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == "6":
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif user_choice == "7":
self.wallet.save_keys()
elif user_choice == "q":
# This will lead to the loop to exist because it's running condition becomes False
waiting_for_input = False
else:
print("Input is invalid, please pick a value from a list.")
# verifier = Verification()
if not Verification.verify_chain(self.blockchain.get_chain()):
self.print_blockchain_blocks()
print("Invalid Blockchain!")
# Break out of the loop
break
print("Balance of {}: {:6.2f}".format(self.wallet.public_key, self.blockchain.get_balances()))
else:
print("User Left!")
print ("Done!")