def resolve(self):
for node in self.__peer_nodes:
winner_chain = self.chain
replace = False
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)
local_chain_length = len(winner_chain)
if node_chain_length > local_chain_length and Verification.verify_blockchain(
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 = f'http://{node}/chain'
try:
response = requests.get(url)
node_chain = response.json()
node_chain = [
Block(block['previous_hash'], block['index'], [
Transaction(tx['sender'], tx['recipient'],
tx['signature'], tx['amount'])
for tx in block['transactions']
], block['proof']) for block in node_chain
]
node_chain_length = len(node_chain)
winner_chain_length = len(winner_chain)
if (node_chain_length > winner_chain_length
and Verification.verify_blockchain(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_to_user_input(self):
waiting_for_user_input = True
while waiting_for_user_input:
print("Make a choice")
print("1: Add new transaction value")
print("2: Mine a new block")
print("3: Outputting 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("Transaction added successfuly!")
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 transanction")
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.lower() == 'q':
break
else:
print("Invalid input, Please enter an option from those displayed on your screen!")
if not Verification.verify_blockchain(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()))
print("Done!")
def listen_for_user_input(self):
waiting_for_input = True
while waiting_for_input:
print("Please choose")
print("1) Add a new value to blockchain.")
print("2) Mine open transactions.")
print("3) Print out blockchain.")
print("4) Check open transactions for validity.")
print("5) Create wallet.")
print("6) Load wallet.")
print("7) Save wallet.")
print("q) Quit program.")
choice = self.get_user_choice()
if choice == "1":
recipient, amount = self.get_transaction_value()
signature = self.wallet.sign_transaction(recipient, amount)
if self.blockchain.add_transaction(self.wallet.public_key,
recipient, signature,
amount):
print("Added Transaction.")
else:
print("Transaction failed.")
elif choice == "2":
if not self.blockchain.mine_block():
print("Mining failed. Got a wallet?")
elif choice == "3":
self.print_blockchain_elements()
elif choice == "4":
print(
Verification.check_transactions_validity(
self.blockchain.get_open_transactions,
self.blockchain.get_balance))
elif choice == "5":
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
elif choice == "6":
self.wallet.load_wallet()
self.blockchain = Blockchain(self.wallet.public_key)
elif choice == "7":
self.wallet.save_keys()
elif choice == "q":
waiting_for_input = False
else:
print("Input is invalid.")
if not Verification.verify_blockchain(self.blockchain.chain):
print("Blockchain is not valid!")
waiting_for_input = False
self.print_balance()
else:
print("User left.")
def listening_for_input(self):
waiting_for_input = True
while waiting_for_input:
choice = self.get_user_choice()
if choice == '1':
if self.wallet.public_key==None:
print('Transaction failed!')
continue
new_recipient, new_amount = self.get_transaction_value()
signature=self.wallet.sign_transaction(self.wallet.public_key,new_recipient,new_amount)
if self.blockchain.add_transaction(new_recipient, self.wallet.public_key, signature, new_amount)!=None:
print('Added transaction!')
else:
print('Transaction failed!')
elif choice == '2':
if not self.blockchain.mine_block():
print('Mining failed. Got no wallet?')
elif choice == '3':
self.print_blockchain_elements()
elif choice == '4':
if Verification.verify_transactions(self.blockchain.get_balance,self.blockchain.get_open_transactions()):
print('All transactions are valid')
else:
print('There are invalid transactions')
print(self.blockchain.get_open_transactions())
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 == 'q':
waiting_for_input = False
else:
print('Input was invalid, please pick a value from the list!')
if not Verification.verify_blockchain(self.blockchain.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 resolve( self ):
winner_chain = self.__chain
replaced = False
for node in self.__peer_nodes:
try:
url = 'http://{}/chain'.format( node )
response = requests.get( url )
node_chain = response.json()
node_chain = [ Block( block['index'], block['previous_hash'],
[ Transaction( tx['sender'], tx['recipient'], tx['amount'], tx['signature']) for
tx in block['transactions'] ],
block[ 'proof' ],
block['timestamp']
) for block in node_chain ]
if len( node_chain ) > len( winner_chain ) and Verification.verify_blockchain( node_chain ):
winner_chain = node_chain
replaced = True
except ConnectionError:
print('Connection error occured while connection chain REST api from resolve()...')
self.__chain = winner_chain
self.resolve_conflicts = False
if replaced:
self.__open_transactions = []
print( 'Chain has been replaced !')
self.save_data()
return replaced
