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(winner_chain)
if (node_chain_length > local_chain_length
and Verification.verify_chain_integrity(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):
while True:
choice = self.get_menu_input()
if choice == 1:
tx_recipient, tx_amount = self.get_transaction_input()
signature = self.wallet.sign_transactions(
self.wallet.public_key, tx_recipient, tx_amount)
if self.blockchain.add_transaction(
recipient=tx_recipient,
sender=self.wallet.public_key,
signature=signature,
amount=tx_amount):
print('Added Transaction')
else:
print('Transaction Failed!')
print(self.blockchain.get_open_transactions())
elif choice == 2:
if not self.blockchain.mine_block():
print('Mining Failed...Got wallet ?')
elif choice == 3:
self.display_blockchain()
elif choice == 4:
if Verification.verify_transactions(
self.blockchain.get_open_transactions(),
self.blockchain.get_balance):
print('All transactions are valid!')
else:
print('Invalid Tx present!')
elif choice == 5:
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif choice == 6:
self.wallet.load_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif choice == 7:
self.wallet.save_keys()
elif choice == 8:
break
else:
print('Invalid Input!')
if not Verification.verify_chain_integrity(
self.blockchain.get_chain()):
print('Block chain has been compromised .... x x x x ')
break
print(
f'Balance of {self.wallet.public_key} = {self.blockchain.get_balance():.2f}'
)
print('Done :) ')
return 0
