async def getwork(*args, **kwargs):
"""
https://en.bitcoin.it/wiki/Getwork
Result:
1. "data" (hex string, required) block data
2. "target" (hex string, required) little endian hash target
"""
if len(args) == 0:
now = int(time() - V.BLOCK_GENESIS_TIME)
for block in getwork_cashe.values():
if block.previous_hash != chain_builder.best_block.hash:
continue
if now - block.time < 10:
mining_block = block
break
else:
mining_block = await get_mining_block(int(kwargs['password']))
getwork_cashe[mining_block.merkleroot] = mining_block
mining_block.bits2target()
# Pre-processed SHA-2 input chunks
data = mining_block.b # 80 bytes
data += a2b_hex('800000000000000000000000000000000000000000000000'
'000000000000000000000000000000000000000000000280') # 48+80=128bytes
new_data = b''
for i in range(0, 128, 4):
new_data += data[i:i + 4][::-1]
if extra_target:
return {"data": new_data.hex(), "target": extra_target.to_bytes(32, 'big').hex()}
else:
return {"data": new_data.hex(), "target": mining_block.target_hash.hex()}
else:
data = a2b_hex(args[0])
new_data = b''
for i in range(0, 128, 4):
new_data += data[i:i + 4][::-1]
block = Block.from_binary(binary=new_data[:80])
if block.previous_hash != chain_builder.best_block.hash:
return 'PreviousHash don\'t match'
if block.merkleroot in getwork_cashe:
block.txs.extend(getwork_cashe[block.merkleroot].txs)
result = await submitblock(block, **kwargs)
if result is None:
return True
elif extra_target and block.pow_check(extra_target=extra_target):
return True
else:
log.debug("GetWorkReject by \"{}\"".format(result))
return result
else:
log.debug("GetWorkReject by \"Not found merkleroot.\"")
return 'Not found merkleroot'
def fill_newblock_info(data):
new_block: Block = Block.from_binary(binary=data['binary'])
log.debug("fill newblock height={} newblock={}".format(
data.get('height'), new_block.hash.hex()))
proof: TX = data['proof']
new_block.txs.append(proof)
new_block.flag = data['block_flag']
my_block = chain_builder.get_block(new_block.hash)
if my_block:
raise BlockChainError('Already inserted block {}'.format(my_block))
before_block = chain_builder.get_block(new_block.previous_hash)
if before_block is None:
log.debug("Cannot find beforeBlock, try to ask outside node")
# not found beforeBlock, need to check other node have the the block
new_block.inner_score *= 0.70 # unknown previousBlock, score down
before_block = make_block_by_node(blockhash=new_block.previous_hash,
depth=0)
new_height = before_block.height + 1
proof.height = new_height
new_block.height = new_height
# work check
# TODO: correct position?
if not new_block.pow_check():
raise BlockChainError('Proof of work is not satisfied')
# Append general txs
for txhash in data['txs'][1:]:
tx = tx_builder.get_tx(txhash)
if tx is None:
new_block.inner_score *= 0.75 # unknown tx, score down
log.debug("Unknown tx, try to download")
r = ask_node(cmd=DirectCmd.TX_BY_HASH,
data={'txhash': txhash},
f_continue_asking=True)
if isinstance(r, str):
raise BlockChainError(
'Failed unknown tx download "{}"'.format(r))
tx: TX = r
tx.height = None
check_tx(tx, include_block=None)
tx_builder.put_unconfirmed(tx)
log.debug("Success unknown tx download {}".format(tx))
tx.height = new_height
new_block.txs.append(tx)
return new_block
def load_boot_file(url=None):
normal_path = os.path.join(os.path.abspath(os.path.dirname(__file__)),
'boot.json')
extra_path = os.path.join(V.DB_HOME_DIR, 'boot.json')
if url:
data = requests.get(url=url).json()
elif os.path.exists(normal_path):
with open(normal_path, mode='r') as fp:
data = json.load(fp)
elif os.path.exists(extra_path):
with open(extra_path, mode='r') as fp:
data = json.load(fp)
else:
raise FileNotFoundError('Cannot find boot.json "{}" or "{}" ?'.format(
normal_path, extra_path))
# load from exist boot.json
genesis_block = Block.from_binary(binary=a2b_hex(data['genesis_binary']))
assert genesis_block.hash == a2b_hex(data['genesis_hash'])
genesis_block.flag = C.BLOCK_GENESIS
genesis_block.height = 0
for tx_dct in data['txs']:
tx = TX.from_binary(binary=a2b_hex(tx_dct['binary']))
assert tx.hash == a2b_hex(tx_dct['hash'])
tx.height = 0
genesis_block.txs.append(tx)
connections = data['connections']
network_ver = data['network_ver']
if isinstance(data['params'], dict):
# new type boot.json
params = data['params']
params['consensus'] = {
int(k): v
for k, v in params['consensus'].items()
}
elif isinstance(data['params'], str):
# old type boot.json
params = original_mpk.unpackb(a2b_hex(data['params']),
raw=True,
encoding='utf8')
else:
raise Exception('Unknown type params')
return genesis_block, params, network_ver, connections
def object_hook(dct):
if isinstance(dct, dict) and '_bc4py_class_' in dct:
if dct['_bc4py_class_'] == 'Block':
block = Block.from_binary(binary=dct['binary'])
block.height = dct['height']
block.flag = dct['flag']
block.txs.extend(object_hook(tx) for tx in dct['txs'])
for tx in block.txs:
tx.height = block.height
return block
elif dct['_bc4py_class_'] == 'TX':
tx = TX.from_binary(binary=dct['binary'])
tx.height = dct['height']
tx.signature.extend(tuple(sig) for sig in dct['signature'])
tx.R = dct['R']
return tx
else:
raise Exception('Not found class name "{}"'.format(
dct['_bc4py_class_']))
else:
return dct
async def submitblock(*args, **kwargs):
"""
Attempts to submit new block to network.
See https://en.bitcoin.it/wiki/BIP_0022 for full specification.
Arguments
1. "hexdata" (string, required) the hex-encoded block data to submit
2. "dummy" (optional) dummy value, for compatibility with BIP22. This value is ignored.
Result:
null if success
string if failed
"""
if len(args) == 0:
raise ValueError('no argument found')
block_hex_or_obj = args[0]
if isinstance(block_hex_or_obj, str):
block_bin = a2b_hex(block_hex_or_obj)
# Block
mined_block = Block.from_binary(binary=block_bin[:80])
if mined_block.previous_hash != chain_builder.best_block.hash:
return 'PreviousHash don\'t match'
previous_block = chain_builder.get_block(mined_block.previous_hash)
mined_block.height = previous_block.height + 1
mined_block.flag = int(kwargs['password'])
# tx length
storage_flag = int.from_bytes(block_bin[80:81], 'little')
if storage_flag < 0xfd:
tx_len = storage_flag
pos = 81
elif storage_flag == 0xfd:
tx_len = int.from_bytes(block_bin[81:83], 'little')
pos = 83
elif storage_flag == 0xfe:
tx_len = int.from_bytes(block_bin[81:85], 'little')
pos = 85
else: # == 0xff
tx_len = int.from_bytes(block_bin[81:89], 'little')
pos = 89
log.debug("RpcSubmit block: pos={}, tx_len={}".format(pos, tx_len))
# correct txs
while len(block_bin) > pos:
tx = TX()
tx.b = block_bin
tx.deserialize(first_pos=pos, f_raise=False)
if tx.version != __chain_version__:
return 'tx_ver do not match [{}!={}]'.format(tx.version, __chain_version__)
pos += len(tx.b)
mined_block.txs.append(tx_builder.get_tx(txhash=tx.hash, default=tx))
# check format
if tx_len != len(mined_block.txs):
return 'Do not match txlen [{}!={}]'.format(tx_len, len(mined_block.txs))
if pos != len(block_bin):
return 'Do not match pos [{}!={}]'.format(pos, len(block_bin))
elif isinstance(block_hex_or_obj, Block):
mined_block = block_hex_or_obj
previous_block = chain_builder.get_block(mined_block.previous_hash)
mined_block.height = previous_block.height + 1
mined_block.flag = int(kwargs['password'])
else:
return 'Unknown input? -> {}'.format(block_hex_or_obj)
mined_block.update_pow()
if mined_block.pow_check():
confirmed_generating_block(mined_block)
return None # accepted
else:
return 'not satisfied work'