def create_block(cls):
last_block = Block.last()
previous_hash = last_block.block_id
proof_of_work = ProofOfWork(previous_hash, 10)
proof_result = proof_of_work.prove()
if not proof_result.isValid():
raise Exception('fail proof')
transactions = UnconfirmedTransactionPool.transactions.copy()
UnconfirmedTransactionPool.transactions.clear()
block_number = len(Block.list()) + 1
block = Block.build(
block_number = block_number,
version = "1",
previous_block_hash = previous_hash,
timestamp = datetime.now().timestamp(),
merkle_root = "", # TODO
difficulty_target = 10,
nonce = proof_result.nonce,
transactions = transactions
)
for tx in transactions:
tx.block_id = block.block_id
Block.create_block(block)
db.session.commit()
transaction = cls._create_transaction_to_miner()
return block, proof_result, transaction
def receive_block(cls, block, proof_result, send_node_url):
last_block = Block.last()
if not proof_result.isValid():
raise Exception('received block is invalid')
if last_block.block_id != block.previous_block_hash:
if last_block.block_number < block.block_number:
print('resolving conflicting...')
cls._resolve_conflicts(send_node_url)
if last_block.block_id == block.previous_block_hash:
Block.create_block(block)
UnconfirmedTransactionPool.transactions.clear()
db.session.commit()