def listen(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 = input('Selection: ')
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('Transaction Added')
else:
print('Transaction Failed')
print(self.blockchain.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 valid')
else:
print('Invalid transaction found!')
print('Exiting!')
break
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()
print('Balance of {}: {:6.4f}'.format(self.wallet.public_key, self.blockchain.get_balance()))
else:
print('User left!')
print('Done!')
def listen_for_input(self):
awaiting_input = True
while awaiting_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()
# one possibility is to unpack the tuple by following where the first element of the tuple will be assigned to the first variable (recipient):
recipient, amount = tx_data
# second possibility is to call the respective elements directly as argument as following:
# add_transaction(owner, tx_data[0], tx_data[1])
# skip the optional sender argument my having a named argument of amount
#I can check it like that with if since add_transaction returns either True or False
if self.blockchain.add_transaction(recipient,
self.id,
amount=amount):
print("Successfully added a transaction!")
else:
print("Transaction failed!")
print(self.blockchain.open_transactions)
elif user_choice == "2":
#reset the block when successful mined since the transactions are then already processed and shouldn't be processed again
self.blockchain.mine_block()
elif user_choice == "3":
self.print_blockchain_output()
elif user_choice == "4":
verifier = Verification()
if verifier.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":
awaiting_input = False
else:
print(
"Input was invalid, please pick one of the values 1 or 2.")
"""
Check if results of verify_chain (from the returned is_valid) is not True
--> because "if verify_chain()" would check if True, which we would need if we want to continue,
but here we want to have the case that in case it's false we want to exit the loop
"""
verifier = Verification()
if not verifier.verify_chain(self.blockchain.chain):
self.print_blockchain_output()
print("Invalid blockchain!")
break
print('Balance of {}:{:6.2f}'.format(
self.id, self.blockchain.get_balance()))
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('h: Manipulate the chain')
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.open_transactions)
elif user_choice == '2':
self.blockchain.mine_block()
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
v = Verification()
if v.verify_transactions(self.blockchain.open_transactions,
self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There are invalid transactions')
# elif user_choice == 'h':
# if len(blockchain) >= 1:
# blockchain[0] = {
# 'previous_hash': '',
# 'index': 0,
# 'transactions': [{
# 'sender': 'Chris',
# 'recipient': 'Will',
# 'amount': 100.0
# }]
# }
elif user_choice == 'q':
waiting_for_input = False
else:
print('Input was invalid, please pick a value from the list!')
v = Verification()
if not v.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()))
else:
print('User left!')
print('Done!')
def listen_for_input(self):
waiting_for_input = True
while waiting_for_input:
print("Please Select:")
print("1. Enter the transaction amount.")
print("2. Mine a new block.")
print("3. Output the blockchain block")
print("4. Check transaction validity")
print("q. Quit")
user_choice = self.get_user_choice()
print()
if user_choice == '1':
tx_data = self.get_transaction_value()
recipient, amount = tx_data
# Add the transaction amount to the blockchain.
if self.blockchain.add_transaction(recipient,
sender=self.id,
amount=amount):
print("Added Transaction!!")
else:
print("Transaction Failed!")
print(self.blockchain.get_open_transaction())
elif user_choice == '2':
self.blockchain.mine_block()
elif user_choice == '3':
self.print_blockchian_elements()
elif user_choice == '4':
if Verification.verify_transactions(
self.blockchain.get_open_transaction(),
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!!")
print("Exiting after printing the blocks")
self.print_blockchian_elements()
break
if not Verification.verify_chain(self.blockchain.get_chain()):
self.print_blockchian_elements()
print("Invalid Blockchain!")
break
print('Balance of {}: {:6.4f}'.format(
self.id, self.blockchain.get_balance()))
else:
print("User Logged Out!")
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('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
if self.blockchain.add_transaction(recipient,
self.id,
amount=amount):
print('Added transaction!')
else:
print('Transaction failed!')
print(self.blockchain.open_transactions)
elif user_choice == '2':
self.blockchain.mine_block()
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
verifier = Verification()
if verifier.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':
# 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!')
verifier = Verification()
if not verifier.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.id, self.blockchain.get_balance()))
else:
print('User left!')
print('Done!')
def listen_for_input(self):
while True:
print('Please choose')
print('1: Add a new transcation 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')
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_open_tx())
elif user_choice == '2':
if not self.blockchain.mine_block():
print('No wallet, mining failed!')
elif user_choice == '3':
self.print_blockchain_elements()
elif user_choice == '4':
if Verification.verify_transactions(self.blockchain.get_open_tx(), self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There is invalid transaction')
elif user_choice == '5':
self.wallet.create_key()
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':
break
else:
print('Input was invalid')
if not Verification.verify_chain(self.blockchain.get_chain()):
self.print_blockchain_elements()
print('Invalid blockchain!')
break
print('Balacne of {}: {:6.2f}'.format(self.wallet.public_key, 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.get_open_transactions(),
self.blockchain.get_balance):
print('All transactions are valid')
else:
print('There are invalid transactions')
# elif user_choice == 'h':
# if len(blockchain) >= 1:
# blockchain[0] = {
# 'previous_hash': hashed_block,
# 'index': len(blockchain),
# 'transactions': [{'sender': 'Chris', 'recipient': 'Max', 'amount': 100.0}]
# }
elif user_choice == 'q':
waiting_for_input = False
else:
raise (ValueError(
'Input was invalid, please pick a value from the list!'))
print('Choice registered!')
if not Verification.verify_chain(self.blockchain.blockchain):
self.print_blockchain_elements()
print('Invalid blockchain')
break
print(self.blockchain.get_balance())
print('Done!')
def listen_for_input(self):
""" allows user to input choices and complete actions on the blockchain """
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.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('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.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 new transaction.')
print('2: Mine a new block.')
print('3: Output the blockchain blocks.')
print('4: Check transaction validity.')
print('q: Exit')
user_choice = self.get_input()
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.output_blockchain()
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 == 'q':
waiting_for_input = False
else:
print('Invalid option. \n')
if not Verification.verify_chain(self.blockchain.get_chain()):
self.output_blockchain()
print('Invalid blockchain!')
waiting_for_input = False
print("{}'s balance: {:6.2f} \n".format(
self.id, self.blockchain.get_balance()))
print('Done!')
print('Added Transactoin.')
else:
print('Transaction failed.')
print(open_transactions)
elif user_choice == '2':
if mine_block():
open_transactions = []
save_data()
elif user_choice == '3':
print_blockchain_elements()
elif user_choice == '4':
verifier = Verification()
if verifier.verify_transactions(open_transactions, get_balance):
print('All transactions are valid.')
else:
print('There are invalid transactions.')
elif user_choice == 'q':
waiting_for_input = False
else:
print('Input was invalid, please pick a value from the list!')
verifier = Verification()
if not verifier.verify_chain(blockchain):
print_blockchain_elements()
print('Blockchain no longer valid')
break
print('Balace of {}: {:6.2f}'.format('John', get_balance('John')))
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
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 # tuple unpacking!
# 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()
) # testing purpose only!
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':
waiting_for_input = False
else:
print('Unknown command. Please, enter choice 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!')
