def load_keys():
if wallet.load_keys():
global blockchain
blockchain = Blockchain(wallet.public_key, port)
response = {
'public_key': wallet.public_key,
'private_key': wallet.private_key,
'funds': blockchain.get_balance()
}
return jsonify(response), 201
else:
response = {
'message': 'Loading the keys failed.'
}
return jsonify(response), 500
from block import Block
from blockhain import Blockchain
blockchain = Blockchain()
# mine for 10 blocks
for n in range(10):
blockchain.mine(Block(f"Block {n + 1}"))
# prints mining output
while blockchain.head is not None:
print(blockchain.head)
blockchain.head = blockchain.head.next
if node_url == '' or node_url == None:
response = {
'message': 'No node found.'
}
return jsonify(response), 400
blockchain.remove_peer_node(node_url)
response = {
'message': 'Node removed',
'all_nodes': blockchain.get_peer_nodes()
}
return jsonify(response), 200
@app.route('/nodes', methods=['GET'])
def get_nodes():
nodes = blockchain.get_peer_nodes()
response = {
'all_nodes': nodes
}
return jsonify(response), 200
if __name__ == '__main__':
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument('-p', '--port', type=int, default=5000)
args = parser.parse_args()
port = args.port
wallet = Wallet(port)
blockchain = Blockchain(wallet.public_key, port)
app.run(host='0.0.0.0', port=port)
class Node:
"""The node which runs the local blockchain instance.
Attributes:
:id: The id of the node.
:blockchain: The blockchain which is run by this node.
"""
def __init__(self):
# self.id = str(uuid4())
self.wallet = Wallet()
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)
def get_transaction_value(self):
""" Returns the input of the user (a new transaction amount) as a float. """
# Get the user input, transform it from a string to a float and store it in user_input
tx_recipient = input('Enter the recipient of the transaction: ')
tx_amount = float(input('Your transaction amount please: '))
return tx_recipient, tx_amount
def get_user_choice(self):
"""Prompts the user for its choice and return it."""
user_input = input('Your choice: ')
return user_input
def print_blockchain_elements(self):
""" Output all blocks of the blockchain. """
# Output the blockchain list to the console
for block in self.blockchain.chain:
print('Outputting Block')
print(block)
else:
print('-' * 20)
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 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 __init__(self):
# self.id = str(uuid4())
self.wallet = Wallet()
self.wallet.create_keys()
self.blockchain = Blockchain(self.wallet.public_key)