def create_transaction(self, blockchain, amount, recipient,
transaction_pool):
"""
Creates or updates a transaction
"""
self.balance = self.calculate_balance(blockchain)
if amount > self.balance:
raise Exception(
f'{amount} exceeds current balance: {self.balance}')
transaction = transaction_pool.existing_transaction(self.address)
if transaction:
transaction.update(self, recipient, amount)
else:
transaction = Transaction.new_transaction(self, recipient, amount)
transaction_pool.add_transaction(transaction)
return transaction
if os.environ.get('PEER') == 'True':
PORT = random.randint(5001, 6000)
result = requests.get(f'http://localhost:{ROOT_PORT}/blockchain')
new_blockchain = Blockchain.from_json(result.json())
try:
blockchain.replace_chain(new_blockchain.chain)
print('Synchronized the local blockchain')
except Exception as e:
print(f'Synchronization error: {e}')
for i in range(10):
blockchain.add_block([
Transaction.new_transaction(Wallet(),
Wallet().address,
random.randrange(10, 40, 10)).to_json(),
Transaction.new_transaction(Wallet(),
Wallet().address,
random.randrange(10, 40, 10)).to_json()
])
for i in range(5):
transaction_pool.add_transaction(
Transaction.new_transaction(Wallet(),
Wallet().address,
random.randrange(10, 40, 10)))
app.run(port=PORT)
