def test_block_chain_create_block(fx_block_chain: BlockChain):
transaction = Transaction(
sender=bytes.fromhex('a9596e7414064c778bdc36b76bb2dc2c'),
recipient=bytes.fromhex('619b9000222b457b978efbca2815d38a'),
amount=decimal.Decimal('0.125'),
)
fx_block_chain.append_transaction(transaction)
block = fx_block_chain.create_block(
proof=1234,
reward_recipient=bytes.fromhex('619b9000222b457b978efbca2815d38a'),
timestamp=fx_block_chain.last_block.timestamp + 15000,
)
assert fx_block_chain.chain[-1] == block
assert block.index == 3
assert block.timestamp == 737511533930
assert len(block.transactions) == 3
assert transaction in block.transactions
assert block.proof == 1234
assert block.previous_hash == bytes.fromhex(
'46e136b65129b85429f25d777cb20c4c44d91ae46e18b6f540c45135d340c2cb'
) # noqa
assert not fx_block_chain.current_transactions
assert fx_block_chain.balance_of(
bytes.fromhex('a9596e7414064c778bdc36b76bb2dc2c')) == 0.125
assert fx_block_chain.balance_of(
bytes.fromhex('619b9000222b457b978efbca2815d38a')) == 1.125
def test_block_chain_create_genesis_block():
block_chain = BlockChain()
block_chain.create_genesis_block(
reward_recipient=bytes.fromhex('5ca60de0575441718094ea0ffcb02aa4'),
timestamp=737511503930, # 1993-05-16T09:18:23.930516
)
assert block_chain.chain == [
Block(
index=1,
timestamp=737511503930,
previous_hash=bytes.fromhex(
'0000000000000000000000000000000000000000000000000000000000000000'
), # noqa
proof=1,
transactions=[
Transaction(
sender=bytes.fromhex('00000000000000000000000000000000'),
recipient=bytes.fromhex(
'5ca60de0575441718094ea0ffcb02aa4'),
amount=decimal.Decimal('1'),
),
],
),
]
assert block_chain.current_transactions == []
def test_block_chain_last_block(fx_block_chain: BlockChain):
assert fx_block_chain.last_block.index == 2
assert fx_block_chain.last_block.hash == bytes.fromhex(
'46e136b65129b85429f25d777cb20c4c44d91ae46e18b6f540c45135d340c2cb'
) # noqa
fx_block_chain.chain = []
assert fx_block_chain.last_block is None
def test_block_chain_append_transaction(fx_block_chain: BlockChain):
transaction = Transaction(
sender=bytes.fromhex('a9596e7414064c778bdc36b76bb2dc2c'),
recipient=bytes.fromhex('619b9000222b457b978efbca2815d38a'),
amount=decimal.Decimal('0.125'),
)
assert fx_block_chain.append_transaction(transaction) == 3
assert len(fx_block_chain.current_transactions) == 2
assert transaction in fx_block_chain.current_transactions
invalid_transaction = Transaction(
sender=bytes.fromhex('00000000000000000000000000000000'),
recipient=bytes.fromhex('619b9000222b457b978efbca2815d38a'),
amount=decimal.Decimal('0.00000001'),
)
with raises(ValueError) as e:
fx_block_chain.append_transaction(invalid_transaction)
assert str(e.value) == 'Mining reward must be 1'
def test_block_chain_valid_transaction(fx_block_chain: BlockChain):
invalid_reward_amount_transaction = Transaction(
sender=bytes.fromhex('00000000000000000000000000000000'),
recipient=bytes.fromhex('619b9000222b457b978efbca2815d38a'),
amount=decimal.Decimal('0.00000001'),
)
with raises(ValueError) as e:
fx_block_chain.valid_transaction(invalid_reward_amount_transaction)
assert str(e.value) == 'Mining reward must be 1'
lack_of_balance_transaction = Transaction(
sender=bytes.fromhex('a9596e7414064c778bdc36b76bb2dc2c'),
recipient=bytes.fromhex('619b9000222b457b978efbca2815d38a'),
amount=decimal.Decimal('10000000'),
)
with raises(ValueError) as e:
fx_block_chain.valid_transaction(lack_of_balance_transaction)
assert str(
e.value) == ('Sender a9596e7414064c778bdc36b76bb2dc2c '
'does not have sufficient balance: 10000000 (have 0.25)')
def fx_block_chain(
fx_block: Block,
fx_transaction: Transaction,
) -> BlockChain:
block_chain = BlockChain(
chain=[fx_block],
nodes={'main.uaena.com', 'sub.uaena.com'},
)
block_chain.append_transaction(fx_transaction)
block_chain.create_block(
proof=1111,
reward_recipient=bytes.fromhex('33ee49f83681417e82660cb9585d13b1'),
timestamp=fx_block.timestamp + 15000, # 1993-05-16T09:18:38.935016
)
block_chain.append_transaction(
Transaction(
sender=bytes.fromhex('33ee49f83681417e82660cb9585d13b1'),
recipient=bytes.fromhex('a9596e7414064c778bdc36b76bb2dc2c'),
amount=decimal.Decimal('0.25'),
), )
return block_chain
def test_block_chain_valid_proof():
assert not BlockChain.valid_proof(1234, 62593)
assert BlockChain.valid_proof(1234, 62594)
assert not BlockChain.valid_proof(1234, 62595)
def test_block_chain_register_node(fx_block_chain: BlockChain):
fx_block_chain.register_node('http://node.uaenapool.com/')
assert len(fx_block_chain.nodes) == 3
assert 'node.uaneapool.com' in fx_block_chain.nodes
import decimal
import typing
import uuid
from flask import Flask, Response, jsonify, request
from typeguard import typechecked
from uaena.block_chain import MINING_REWARD, MINING_REWARD_SENDER, BlockChain
app = Flask(__name__)
node_identifier = str(uuid.uuid4()).replace('-', '')
block_chain = BlockChain()
@app.route('/mine/')
@typechecked
def mine() -> Response:
last_block = block_chain.last_block
last_proof = last_block.proof
proof = block_chain.proof_of_work(last_proof)
block_chain.new_transaction(
sender=MINING_REWARD_SENDER,
recipient=node_identifier,
amount=MINING_REWARD,
)
previous_hash = last_block.hash
block = block_chain.new_block(proof, previous_hash)