class Block(object):
@staticmethod
def isHashPresent(txhash, buffer, blocknumber):
if not buffer:
return False
min_blocknum = min(buffer)
max_blocknum = min(blocknumber - 1, max(buffer))
for blocknum in range(min_blocknum, max_blocknum + 1):
if txhash in buffer[blocknum]:
return True
return False
def create(self, chain, hashchain_link, reveal_list=None, vote_hashes=None, last_block_number=-1):
# FIXME: probably this should turn into a constructor
if not reveal_list:
reveal_list = []
if not vote_hashes:
vote_hashes = []
data = None
if last_block_number == -1:
data = chain.block_chain_buffer.get_last_block() # m_get_last_block()
else:
data = chain.block_chain_buffer.get_block_n(last_block_number)
last_block_number = data.blockheader.blocknumber
prev_blockheaderhash = data.blockheader.headerhash
hashedtransactions = []
self.transactions = [None]
for tx in chain.transaction_pool:
hashedtransactions.append(tx.txhash)
self.transactions.append(tx) # copy memory rather than sym link
if not hashedtransactions:
hashedtransactions = sha256('')
hashedtransactions = merkle_tx_hash(hashedtransactions)
self.blockheader = BlockHeader()
self.blockheader.create(chain=chain,
blocknumber=last_block_number + 1,
reveal_list=reveal_list,
vote_hashes=vote_hashes,
hashchain_link=hashchain_link,
prev_blockheaderhash=prev_blockheaderhash,
hashedtransactions=hashedtransactions)
coinbase_tx = transaction.CoinBase().create(self.blockheader.block_reward, self.blockheader.headerhash,
chain.my[0][1])
self.transactions[0] = coinbase_tx
coinbase_tx.nonce = chain.block_chain_buffer.get_stxn_state(last_block_number + 1, chain.mining_address)[0] + 1
def json_to_block(self, json_block):
self.blockheader = BlockHeader()
self.blockheader.json_to_blockheader(json_block['blockheader'])
transactions = json_block['transactions']
self.transactions = []
for tx in transactions:
self.transactions.append(Transaction.get_tx_obj(tx))
if self.blockheader.blocknumber == 0:
self.state = json_block['state']
self.stake_list = json_block['stake_list']
@staticmethod
def from_json(json_block):
"""
Constructor a block from a json string
:param json_block: a block serialized as a json string
:return: A block
"""
tmp_block = Block()
tmp_block.json_to_block(json.loads(json_block))
return tmp_block
def validate_tx_in_block(self):
# Validating coinbase txn
coinbase_txn = self.transactions[0]
valid = coinbase_txn.validate_tx(block_headerhash=self.blockheader.headerhash)
if not valid:
logger.warning('coinbase txn in block failed')
return False
for tx_num in range(1, len(self.transactions)):
tx = self.transactions[tx_num]
if tx.validate_tx() is False:
logger.warning('invalid tx in block')
logger.warning('subtype: %s txhash: %s txfrom: %s', tx.subtype, tx.txhash, tx.txfrom)
return False
return True
def validate_block(self, chain, verify_block_reveal_list=True): # check validity of new block..
"""
block validation
:param chain:
:param verify_block_reveal_list:
:return:
"""
b = self.blockheader
last_blocknum = b.blocknumber - 1
if len(self.transactions) == 0:
logger.warning('BLOCK : There must be atleast 1 txn')
return False
coinbase_tx = self.transactions[0]
try:
if coinbase_tx.subtype != transaction.TX_SUBTYPE_COINBASE:
logger.warning('BLOCK : First txn must be a COINBASE txn')
return False
except Exception as e:
logger.exception(e)
return False
if coinbase_tx.txfrom != self.blockheader.stake_selector:
logger.info('Non matching txto and stake_selector')
logger.info('txto: %s stake_selector %s', coinbase_tx.txfrom, self.blockheader.stake_selector)
return False
if coinbase_tx.amount != self.blockheader.block_reward:
logger.info('Block_reward doesnt match')
logger.info('Found: %d Expected: %d', coinbase_tx.amount, self.blockheader.block_reward)
return False
if b.timestamp == 0 and b.blocknumber > 0:
logger.warning('Invalid block timestamp ')
return False
if b.block_reward != b.block_reward_calc():
logger.warning('Block reward incorrect for block: failed validation')
return False
if b.epoch != b.blocknumber / config.dev.blocks_per_epoch:
logger.warning('Epoch incorrect for block: failed validation')
return False
if b.blocknumber == 1:
x = 0
for tx in self.transactions:
if tx.subtype == transaction.TX_SUBTYPE_STAKE:
if tx.txfrom == b.stake_selector:
x = 1
hash, _ = chain.select_hashchain(chain.m_blockchain[-1].blockheader.headerhash,
b.stake_selector,
tx.hash, blocknumber=1)
if sha256(b.hash) != hash or hash not in tx.hash:
logger.warning('Hashchain_link does not hash correctly to terminator: failed validation')
return False
if x != 1:
logger.warning('Stake selector not in block.stake: failed validation')
return False
else: # we look in stake_list for the hash terminator and hash to it..
found = False
terminator = sha256(b.hash)
for _ in range(b.blocknumber - (b.epoch * config.dev.blocks_per_epoch) + 1):
terminator = sha256(terminator)
tmp_stake_list = chain.state.stake_list_get()
for st in tmp_stake_list:
if st[0] == b.stake_selector:
found = True
if terminator != st[1][-1]:
logger.warning('Supplied hash does not iterate to terminator: failed validation')
return False
if not found:
logger.warning('Stake selector not in stake_list for this epoch..')
return False
if len(b.reveal_list) != len(set(b.reveal_list)):
logger.warning('Repetition in reveal_list')
return False
if verify_block_reveal_list:
i = 0
for r in b.reveal_list:
t = sha256(r)
for _ in range(b.blocknumber - (
b.epoch * config.dev.blocks_per_epoch) + 1): # +1 as reveal has 1 extra hash
t = sha256(t)
for s in tmp_stake_list:
if t == s[1][-1]:
i += 1
if i != len(b.reveal_list):
logger.warning('Not all the reveal_hashes are valid..')
return False
i = 0
target_chain = select_target_hashchain(b.prev_blockheaderhash)
for r in b.vote_hashes:
t = sha256(r)
for x in range(b.blocknumber - (b.epoch * config.dev.blocks_per_epoch)):
t = sha256(t)
for s in tmp_stake_list:
if t == s[1][target_chain]:
i += 1
if i != len(b.vote_hashes):
logger.warning('Not all the reveal_hashes are valid..')
return False
if b.generate_headerhash() != b.headerhash:
logger.warning('Headerhash false for block: failed validation')
return False
tmp_last_block = chain.block_chain_buffer.get_block_n(last_blocknum)
if tmp_last_block.blockheader.headerhash != b.prev_blockheaderhash:
logger.warning('Headerhash not in sequence: failed validation')
return False
if tmp_last_block.blockheader.blocknumber != b.blocknumber - 1:
logger.warning('Block numbers out of sequence: failed validation')
return False
if not self.validate_tx_in_block():
logger.warning('Block validate_tx_in_block error: failed validation')
return False
if len(self.transactions) == 1:
txhashes = sha256('')
else:
txhashes = []
for tx_num in range(1, len(self.transactions)):
tx = self.transactions[tx_num]
txhashes.append(tx.txhash)
if merkle_tx_hash(txhashes) != b.tx_merkle_root:
logger.warning('Block hashedtransactions error: failed validation')
return False
return True
def validate_block_timestamp(self, last_block_timestamp):
if last_block_timestamp >= self.blockheader.timestamp:
return False
curr_time = ntp.getTime()
if curr_time == 0:
return False
max_block_number = int((curr_time - last_block_timestamp) / config.dev.block_creation_seconds)
if self.blockheader.blocknumber > max_block_number:
return False
class Block(object):
def __init__(self):
self.blockheader = None
self.transactions = None
self.duplicate_transactions = None
self.state = None
self.stake_list = None
def create(self, chain, reveal_hash, vote_hash, last_block_number=-1):
# FIXME: probably this should turn into a constructor
reveal_hash = reveal_hash
vote_hash = vote_hash
data = None
if last_block_number == -1:
data = chain.block_chain_buffer.get_last_block(
) # m_get_last_block()
else:
data = chain.block_chain_buffer.get_block_n(last_block_number)
last_block_number = data.blockheader.blocknumber
prev_blockheaderhash = data.blockheader.headerhash
hashedtransactions = []
self.transactions = [None]
fee_reward = 0
for tx in chain.transaction_pool:
if tx.subtype == TX_SUBTYPE_TX:
fee_reward += tx.fee
hashedtransactions.append(tx.txhash)
self.transactions.append(tx) # copy memory rather than sym link
self.duplicate_transactions = []
for tx in chain.duplicate_tx_pool:
self.duplicate_transactions.append(chain.duplicate_tx_pool[tx])
if not hashedtransactions:
hashedtransactions = [sha256('')]
hashedtransactions = merkle_tx_hash(hashedtransactions)
self.blockheader = BlockHeader()
self.blockheader.create(chain=chain,
blocknumber=last_block_number + 1,
reveal_hash=reveal_hash,
vote_hash=vote_hash,
prev_blockheaderhash=prev_blockheaderhash,
hashedtransactions=hashedtransactions,
fee_reward=fee_reward)
coinbase_tx = CoinBase().create(
self.blockheader,
chain.block_chain_buffer.get_slave_xmss(last_block_number + 1))
# coinbase_tx = CoinBase().create(self.blockheader.block_reward + self.blockheader.fee_reward,
# self.blockheader.headerhash,
# chain.wallet.address_bundle[0].xmss.get_address(),
# chain.block_chain_buffer.get_slave_xmss(last_block_number + 1))
self.transactions[0] = coinbase_tx
sv_list = chain.block_chain_buffer.get_stake_validators_list(
last_block_number + 1).sv_list
coinbase_tx.nonce = sv_list[chain.mining_address].nonce + 1
def validate_block(self, chain): # check validity of new block..
"""
block validation
:param chain:
:return:
"""
try:
blk_header = self.blockheader
last_blocknum = blk_header.blocknumber - 1
last_block = chain.block_chain_buffer.get_block_n(last_blocknum)
if not self.blockheader.validate(last_block.blockheader):
return False
if len(self.transactions) == 0:
logger.warning('BLOCK : There must be atleast 1 txn')
return False
coinbase_tx = self.transactions[0]
if coinbase_tx.subtype != TX_SUBTYPE_COINBASE:
logger.warning('BLOCK : First txn must be a COINBASE txn')
return False
sv_list = chain.block_chain_buffer.stake_list_get(
self.blockheader.blocknumber)
if coinbase_tx.txto != self.blockheader.stake_selector:
logger.info('Non matching txto and stake_selector')
logger.info('txto: %s stake_selector %s', coinbase_tx.txfrom,
self.blockheader.stake_selector)
return False
if coinbase_tx.amount != self.blockheader.block_reward + self.blockheader.fee_reward:
logger.info('Block_reward doesnt match')
logger.info('Found: %s', coinbase_tx.amount)
logger.info(
'Expected: %s', self.blockheader.block_reward +
self.blockheader.fee_reward)
logger.info('block_reward: %s', self.blockheader.block_reward)
logger.info('fee_reward: %s', self.blockheader.fee_reward)
return False
if blk_header.blocknumber == 1:
found = False
for tx in self.transactions:
if tx.subtype == TX_SUBTYPE_STAKE:
if tx.txfrom == blk_header.stake_selector:
found = True
reveal_hash, vote_hash = chain.select_hashchain(
chain.m_blockchain[-1].blockheader.headerhash,
self.transactions[0].txto,
tx.hash,
blocknumber=1)
if sha256(blk_header.reveal_hash) != reveal_hash:
logger.warning(
'reveal_hash does not hash correctly to terminator: failed validation'
)
return False
if not found:
logger.warning(
'Stake selector not in block.stake: failed validation')
return False
else: # we look in stake_list for the hash terminator and hash to it..
stake_validators_list = chain.block_chain_buffer.get_stake_validators_list(
self.blockheader.blocknumber)
if self.transactions[
0].txto not in stake_validators_list.sv_list:
logger.warning(
'Stake selector not in stake_list for this epoch..')
return False
if not stake_validators_list.validate_hash(
blk_header.reveal_hash, blk_header.blocknumber,
config.dev.hashchain_nums - 1,
self.transactions[0].txto):
logger.warning(
'Supplied hash does not iterate to terminator: failed validation'
)
return False
target_chain = select_target_hashchain(
blk_header.prev_blockheaderhash)
if not stake_validators_list.validate_hash(
blk_header.vote_hash, blk_header.blocknumber,
target_chain, self.transactions[0].txto):
logger.warning('Not all the reveal_hashes are valid..')
return False
if not self._validate_tx_in_block(chain):
logger.warning(
'Block validate_tx_in_block error: failed validation')
return False
except Exception as e:
logger.exception(e)
return False
return True
def _validate_tx_in_block(self, chain):
# Validating coinbase txn
coinbase_txn = self.transactions[0]
valid = coinbase_txn.validate_tx(chain=chain,
blockheader=self.blockheader)
if not valid:
logger.warning('coinbase txn in block failed')
return False
for tx_num in range(1, len(self.transactions)):
tx = self.transactions[tx_num]
if not tx.validate_tx():
logger.warning('invalid tx in block')
logger.warning('subtype: %s txhash: %s txfrom: %s', tx.subtype,
tx.txhash, tx.txfrom)
return False
for tx in self.duplicate_transactions:
if not tx.validate_tx():
logger.warning('invalid duplicate tx in block')
logger.warning('txhash: %s tx_stake_selector: %s',
tx.get_message_hash(), tx.coinbase1.txto)
return False
return True
@staticmethod
def from_json(json_block):
"""
Constructor a block from a json string
:param json_block: a block serialized as a json string
:return: A block
"""
tmp_block = Block()
json_block = json.loads(json_block)
tmp_block.blockheader = BlockHeader.from_json(
json_block['blockheader'])
if tmp_block.blockheader.blocknumber == 0:
tmp_block.state = json_block['state']
tmp_block.stake_list = json_block['stake_list']
json_transactions = json_block['transactions']
json_duplicate_transactions = json_block['duplicate_transactions']
tmp_block.transactions = [
Transaction.from_txdict(tx) for tx in json_transactions
]
tmp_block.duplicate_transactions = [
DuplicateTransaction().from_txdict(tx)
for tx in json_duplicate_transactions
]
return tmp_block
class Block(object):
@staticmethod
def isHashPresent(txhash, buffer, blocknumber):
"""
:param txhash:
:type txhash:
:param buffer:
:type buffer:
:param blocknumber:
:type blocknumber:
:return:
:rtype:
>>> Block.isHashPresent(None, None, None)
False
"""
if not buffer:
return False
min_blocknum = min(buffer)
max_blocknum = min(blocknumber - 1, max(buffer))
for blocknum in range(min_blocknum, max_blocknum + 1):
if txhash in buffer[blocknum]:
return True
return False
def create(self, chain, reveal_hash, vote_hash, last_block_number=-1):
# FIXME: probably this should turn into a constructor
reveal_hash = reveal_hash
vote_hash = vote_hash
data = None
if last_block_number == -1:
data = chain.block_chain_buffer.get_last_block(
) # m_get_last_block()
else:
data = chain.block_chain_buffer.get_block_n(last_block_number)
last_block_number = data.blockheader.blocknumber
prev_blockheaderhash = data.blockheader.headerhash
hashedtransactions = []
self.transactions = [None]
fee_reward = 0
for tx in chain.transaction_pool:
if tx.subtype == TX_SUBTYPE_TX:
fee_reward += tx.fee
hashedtransactions.append(tx.txhash)
self.transactions.append(tx) # copy memory rather than sym link
self.duplicate_transactions = []
for tx in chain.duplicate_tx_pool:
self.duplicate_transactions.append(chain.duplicate_tx_pool[tx])
if not hashedtransactions:
hashedtransactions = [sha256('')]
hashedtransactions = merkle_tx_hash(hashedtransactions)
self.blockheader = BlockHeader()
self.blockheader.create(chain=chain,
blocknumber=last_block_number + 1,
reveal_hash=reveal_hash,
vote_hash=vote_hash,
prev_blockheaderhash=prev_blockheaderhash,
hashedtransactions=hashedtransactions,
fee_reward=fee_reward)
coinbase_tx = CoinBase().create(
self.blockheader,
chain.block_chain_buffer.get_slave_xmss(last_block_number + 1))
#coinbase_tx = CoinBase().create(self.blockheader.block_reward + self.blockheader.fee_reward,
# self.blockheader.headerhash,
# chain.wallet.address_bundle[0].xmss.get_address(),
# chain.block_chain_buffer.get_slave_xmss(last_block_number + 1))
self.transactions[0] = coinbase_tx
sv_list = chain.block_chain_buffer.get_stake_validators_list(
last_block_number + 1).sv_list
coinbase_tx.nonce = sv_list[chain.mining_address].nonce + 1
def json_to_block(self, json_block):
self.blockheader = BlockHeader()
self.blockheader.json_to_blockheader(json_block['blockheader'])
transactions = json_block['transactions']
self.transactions = []
for tx in transactions:
self.transactions.append(Transaction.from_txdict(tx))
duplicate_transactions = json_block['duplicate_transactions']
self.duplicate_transactions = []
for tx in duplicate_transactions:
self.duplicate_transactions.append(
DuplicateTransaction().from_txdict(tx))
if self.blockheader.blocknumber == 0:
self.state = json_block['state']
self.stake_list = json_block['stake_list']
@staticmethod
def from_json(json_block):
"""
Constructor a block from a json string
:param json_block: a block serialized as a json string
:return: A block
"""
tmp_block = Block()
tmp_block.json_to_block(json.loads(json_block))
return tmp_block
def _validate_tx_in_block(self, chain):
# Validating coinbase txn
coinbase_txn = self.transactions[0]
valid = coinbase_txn.validate_tx(chain=chain,
blockheader=self.blockheader)
if not valid:
logger.warning('coinbase txn in block failed')
return False
for tx_num in range(1, len(self.transactions)):
tx = self.transactions[tx_num]
if not tx.validate_tx():
logger.warning('invalid tx in block')
logger.warning('subtype: %s txhash: %s txfrom: %s', tx.subtype,
tx.txhash, tx.txfrom)
return False
for tx in self.duplicate_transactions:
if not tx.validate_tx():
logger.warning('invalid duplicate tx in block')
logger.warning('txhash: %s tx_stake_selector: %s',
tx.get_message_hash(), tx.coinbase1.txto)
return False
return True
def validate_block(self, chain): # check validity of new block..
"""
block validation
:param chain:
:return:
"""
b = self.blockheader
last_blocknum = b.blocknumber - 1
tmp_last_block = chain.block_chain_buffer.get_block_n(last_blocknum)
curr_timestamp = ntp.getTime()
if b.timestamp <= tmp_last_block.blockheader.timestamp:
logger.warning('BLOCK timestamp is less than prev block timestamp')
logger.warning('block timestamp %s ', b.timestamp)
logger.warning('must be greater than %s',
tmp_last_block.blockheader.timestamp)
return False
if b.generate_headerhash() != b.headerhash:
logger.warning('Headerhash false for block: failed validation')
return False
if tmp_last_block.blockheader.timestamp + config.dev.minimum_minting_delay > b.timestamp:
logger.warning(
'BLOCK created without waiting for minimum minting delay')
logger.warning('prev_block timestamp %s ',
tmp_last_block.blockheader.timestamp)
logger.warning('current_block timestamp %s ', b.timestamp)
return False
if tmp_last_block.blockheader.headerhash != b.prev_blockheaderhash:
logger.warning('Headerhash not in sequence: failed validation')
return False
if tmp_last_block.blockheader.blocknumber != b.blocknumber - 1:
logger.warning('Block numbers out of sequence: failed validation')
return False
if len(self.transactions) == 0:
logger.warning('BLOCK : There must be atleast 1 txn')
return False
coinbase_tx = self.transactions[0]
try:
if coinbase_tx.subtype != TX_SUBTYPE_COINBASE:
logger.warning('BLOCK : First txn must be a COINBASE txn')
return False
except Exception as e:
logger.exception(e)
return False
sv_list = chain.block_chain_buffer.stake_list_get(
self.blockheader.blocknumber)
if coinbase_tx.txto != self.blockheader.stake_selector:
logger.info('Non matching txto and stake_selector')
logger.info('txto: %s stake_selector %s', coinbase_tx.txfrom,
self.blockheader.stake_selector)
return False
if coinbase_tx.amount != self.blockheader.block_reward + self.blockheader.fee_reward:
logger.info('Block_reward doesnt match')
logger.info('Found: %s', coinbase_tx.amount)
logger.info(
'Expected: %s',
self.blockheader.block_reward + self.blockheader.fee_reward)
logger.info('block_reward: %s', self.blockheader.block_reward)
logger.info('fee_reward: %s', self.blockheader.fee_reward)
return False
if b.timestamp == 0 and b.blocknumber > 0:
logger.warning('Invalid block timestamp ')
return False
if b.block_reward != b.block_reward_calc():
logger.warning(
'Block reward incorrect for block: failed validation')
return False
if b.epoch != b.blocknumber // config.dev.blocks_per_epoch:
logger.warning('Epoch incorrect for block: failed validation')
return False
if b.blocknumber == 1:
x = 0
for tx in self.transactions:
if tx.subtype == TX_SUBTYPE_STAKE:
if tx.txfrom == b.stake_selector:
x = 1
reveal_hash, vote_hash = chain.select_hashchain(
chain.m_blockchain[-1].blockheader.headerhash,
self.transactions[0].txto,
tx.hash,
blocknumber=1)
if sha256(b.reveal_hash) != reveal_hash:
logger.warning(
'reveal_hash does not hash correctly to terminator: failed validation'
)
return False
if sha256(b.vote_hash) != vote_hash:
logger.warning(
'vote_hash does not hash correctly to terminator: failed validation'
)
return False
if x != 1:
logger.warning(
'Stake selector not in block.stake: failed validation')
return False
else: # we look in stake_list for the hash terminator and hash to it..
stake_validators_list = chain.block_chain_buffer.get_stake_validators_list(
self.blockheader.blocknumber)
if self.transactions[0].txto not in stake_validators_list.sv_list:
logger.warning(
'Stake selector not in stake_list for this epoch..')
return False
if not stake_validators_list.validate_hash(
b.reveal_hash, b.blocknumber,
config.dev.hashchain_nums - 1, self.transactions[0].txto):
logger.warning(
'Supplied hash does not iterate to terminator: failed validation'
)
return False
target_chain = select_target_hashchain(b.prev_blockheaderhash)
if not stake_validators_list.validate_hash(
b.vote_hash, b.blocknumber, target_chain,
self.transactions[0].txto):
logger.warning('Not all the reveal_hashes are valid..')
return False
if not self._validate_tx_in_block(chain):
logger.warning(
'Block validate_tx_in_block error: failed validation')
return False
return True
def validate_block_timestamp(self, last_block_timestamp):
# TODO: Add minimum minting delay
if last_block_timestamp >= self.blockheader.timestamp:
return False
curr_time = ntp.getTime()
if curr_time == 0:
return False
max_block_number = int((curr_time - last_block_timestamp) /
config.dev.block_creation_seconds)
if self.blockheader.blocknumber > max_block_number:
return False