def check_block(block: Block):
# 挿入前にBlockの正当性チェック
if block.f_orphan:
raise BlockChainError('Block is orphan.')
elif len(block.txs) == 0:
raise BlockChainError('Block don\'t have any txs.')
elif block.getsize() > C.SIZE_BLOCK_LIMIT:
raise BlockChainError('Block size is too large [{}b>{}b]'.format(block.getsize(), C.SIZE_BLOCK_LIMIT))
bits = get_bits_by_hash(previous_hash=block.previous_hash, consensus=block.flag)[0]
if block.bits != bits:
raise BlockChainError('Block bits differ from calc. [{}!={}]'.format(block.bits, bits))
logging.debug("Checked block {}.".format(block))
def proof_of_stake(self):
global staking_limit
limit_deque = deque(maxlen=10)
self.event_close.set()
while self.event_close.is_set():
# check start mining
if previous_block is None or unconfirmed_txs is None or unspents_txs is None:
sleep(0.1)
continue
if len(unspents_txs) == 0:
logging.info("No unspents for staking, wait 180s..")
sleep(180)
continue
start = time()
# create staking block
bits, target = get_bits_by_hash(previous_hash=previous_block.hash,
consensus=C.BLOCK_POS)
reward = GompertzCurve.calc_block_reward(previous_block.height + 1)
staking_block = Block(
block={
'merkleroot': b'\xff' * 32,
'time': 0,
'previous_hash': previous_block.hash,
'bits': bits,
'nonce': b'\xff\xff\xff\xff'
})
staking_block.height = previous_block.height + 1
staking_block.flag = C.BLOCK_POS
staking_block.bits2target()
staking_block.txs.append(None) # Dummy proof tx
staking_block.txs.extend(unconfirmed_txs)
calculate_nam = 0
for proof_tx in unspents_txs.copy():
address = proof_tx.outputs[0][0]
proof_tx.outputs[0] = (address, 0,
proof_tx.pos_amount + reward)
proof_tx.update_time()
calculate_nam += 1
# next check block
if previous_block is None or unconfirmed_txs is None or unspents_txs is None:
logging.debug("Reset by \"nothing params found\"")
sleep(1)
break
elif previous_block.hash != staking_block.previous_hash:
logging.debug("Reset by \"Don't match previous_hash\"")
sleep(1)
break
elif not proof_tx.pos_check(
previous_hash=previous_block.hash,
pos_target_hash=staking_block.target_hash):
continue
else:
# Staked yay!!
proof_tx.height = staking_block.height
proof_tx.signature = [
message2signature(proof_tx.b, proof_tx.outputs[0][0])
]
staking_block.txs[0] = proof_tx
# Fit block size
while staking_block.getsize() > C.SIZE_BLOCK_LIMIT:
tx = staking_block.txs.pop()
if tx.type == C.TX_FINISH_CONTRACT:
staking_block.txs.pop()
staking_block.update_time(proof_tx.time)
staking_block.update_merkleroot()
confirmed_generating_block(staking_block)
break
else:
# check time
used = time() - start
remain = 1.0 - used
max_limit = max(50, int(calculate_nam / max(0.0001, used)))
limit_deque.append(int(max_limit * self.power_limit))
staking_limit = sum(limit_deque) // len(limit_deque)
if int(time()) % 90 == 0:
logging.info("Staking... margin={}% limit={}".format(
round(remain * 100, 1), staking_limit))
self.hashrate = (calculate_nam, time())
sleep(max(0.0, remain))
logging.info("Close signal")