import struct from six import int2byte from binascii import unhexlify from torba.baseledger import BaseLedger from torba.baseheader import BaseHeaders, _ArithUint256 from torba.util import int_to_hex, rev_hex, hash_encode from .network import Network from .database import WalletDatabase from .transaction import Transaction class Headers(BaseHeaders): header_size = 112 @staticmethod def _serialize(header): return b''.join([ int_to_hex(header['version'], 4), rev_hex(header['prev_block_hash']), rev_hex(header['merkle_root']), rev_hex(header['claim_trie_root']), int_to_hex(int(header['timestamp']), 4), int_to_hex(int(header['bits']), 4), int_to_hex(int(header['nonce']), 4) ]) @staticmethod def _deserialize(height, header): version, = struct.unpack('> 24) & 0xff assert 0x03 <= bitsN <= 0x1f, \ "First part of bits should be in [0x03, 0x1d], but it was {}".format(hex(bitsN)) bitsBase = bits & 0xffffff assert 0x8000 <= bitsBase <= 0x7fffff, \ "Second part of bits should be in [0x8000, 0x7fffff] but it was {}".format(bitsBase) # new target retargetTimespan = self.ledger.target_timespan nActualTimespan = last['timestamp'] - first['timestamp'] nModulatedTimespan = retargetTimespan + (nActualTimespan - retargetTimespan) // 8 nMinTimespan = retargetTimespan - (retargetTimespan // 8) nMaxTimespan = retargetTimespan + (retargetTimespan // 2) # Limit adjustment step if nModulatedTimespan < nMinTimespan: nModulatedTimespan = nMinTimespan elif nModulatedTimespan > nMaxTimespan: nModulatedTimespan = nMaxTimespan # Retarget bnPowLimit = _ArithUint256(self.ledger.max_target) bnNew = _ArithUint256.SetCompact(last['bits']) bnNew *= nModulatedTimespan bnNew //= nModulatedTimespan if bnNew > bnPowLimit: bnNew = bnPowLimit return bnNew.GetCompact(), bnNew._value class MainNetLedger(BaseLedger): name = 'LBRY Credits' symbol = 'LBC' network_name = 'mainnet' database_class = WalletDatabase headers_class = Headers network_class = Network transaction_class = Transaction secret_prefix = int2byte(0x1c) pubkey_address_prefix = int2byte(0x55) script_address_prefix = int2byte(0x7a) extended_public_key_prefix = unhexlify('019c354f') extended_private_key_prefix = unhexlify('019c3118') max_target = 0x0000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff genesis_hash = '9c89283ba0f3227f6c03b70216b9f665f0118d5e0fa729cedf4fb34d6a34f463' genesis_bits = 0x1f00ffff target_timespan = 150 default_fee_per_byte = 50 default_fee_per_name_char = 200000 def __init__(self, *args, **kwargs): super(MainNetLedger, self).__init__(*args, **kwargs) self.fee_per_name_char = self.config.get('fee_per_name_char', self.default_fee_per_name_char) def get_transaction_base_fee(self, tx): """ Fee for the transaction header and all outputs; without inputs. """ return max( super(MainNetLedger, self).get_transaction_base_fee(tx), self.get_transaction_claim_name_fee(tx) ) def get_transaction_claim_name_fee(self, tx): fee = 0 for output in tx.outputs: if output.script.is_claim_name: fee += len(output.script.values['claim_name']) * self.fee_per_name_char return fee def resolve(self, *uris): return self.network.get_values_for_uris(*uris) class TestNetLedger(MainNetLedger): network_name = 'testnet' pubkey_address_prefix = int2byte(111) script_address_prefix = int2byte(196) extended_public_key_prefix = unhexlify('043587cf') extended_private_key_prefix = unhexlify('04358394') class UnverifiedHeaders(Headers): verify_bits_to_target = False class RegTestLedger(MainNetLedger): network_name = 'regtest' headers_class = UnverifiedHeaders pubkey_address_prefix = int2byte(111) script_address_prefix = int2byte(196) extended_public_key_prefix = unhexlify('043587cf') extended_private_key_prefix = unhexlify('04358394') max_target = 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff genesis_hash = '6e3fcf1299d4ec5d79c3a4c91d624a4acf9e2e173d95a1a0504f677669687556' genesis_bits = 0x207fffff target_timespan = 1