def test_blockchain_monolithic():
genesis_payload = b"Genesis"
genesis_hash_pointer = SHA256(genesis_payload).digest()
genesis_block = Block(genesis_hash_pointer, genesis_payload)
payload_1 = b"My payload"
payload_2 = b"Another one of mine"
payload_3 = b"My last payload"
block_chain = BlockChain(genesis_block)
assert len(block_chain) == 1
assert block_chain.latest_block.payload == genesis_payload
block_chain.verify()
block_chain.append(payload_1)
assert len(block_chain) == 2
assert block_chain.latest_block.payload == payload_1
block_chain.verify()
block_chain.append(payload_2)
assert len(block_chain) == 3
assert block_chain.latest_block.payload == payload_2
block_chain.verify()
block_chain.append(payload_3)
assert len(block_chain) == 4
assert block_chain.latest_block.payload == payload_3
block_chain.verify()
# Replace block in chain
bad_block_payload = b"I am a malicious payload"
bad_block_hash_pointer = block_chain.blocks[2].hash_pointer
bad_block = Block(bad_block_hash_pointer, bad_block_payload)
block_chain.blocks[2] = bad_block
with pytest.raises(RuntimeError):
block_chain.verify()
def __init__(
self,
port=9001,
keys=None,
identity=None # TODO
):
# Initialize socket
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.socket.bind(("", port))
# Initialize key dictionary and identity
# where is the key dictionary?
self.keys = keys
self.identity = identity
# Initialize block chain
genesis_payload = "".join(
("pay ", self.identity, " 0 ", self.identity, " 1000"))
genesis_block = Block(
SHA256(self.identity.encode()).digest(), genesis_payload)
self.blockchain = BlockChain(genesis_block)
def test_block_wrong_type_argument_1():
with pytest.raises(TypeError):
Block("Not a good hash pointer", string_payload)
def test_block_payload_encoding():
block = Block(good_hash_pointer, string_payload)
assert block.payload.decode(Block.ENCODING) == string_payload
def test_block_wrong_value_argument_2():
with pytest.raises(ValueError):
Block(good_hash_pointer, b"A" * (Block.PAYLOAD_SIZE + 1))
def test_block_wrong_value_argument_1():
with pytest.raises(ValueError):
Block(bytes(Block.HASH_POINTER_SIZE + 1), bytes_payload)
def test_block_wrong_type_argument_2():
with pytest.raises(TypeError):
Block(good_hash_pointer, 123)