80 lines
2.8 KiB
Python
80 lines
2.8 KiB
Python
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import six
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from typing import Dict, Type
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from torba.hash import hash160, double_sha256, Base58
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class CoinRegistry(type):
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coins = {} # type: Dict[str, Type[BaseCoin]]
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def __new__(mcs, name, bases, attrs):
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cls = super(CoinRegistry, mcs).__new__(mcs, name, bases, attrs) # type: Type[BaseCoin]
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if not (name == 'BaseCoin' and not bases):
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coin_id = cls.get_id()
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assert coin_id not in mcs.coins, 'Coin with id "{}" already registered.'.format(coin_id)
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mcs.coins[coin_id] = cls
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assert cls.ledger_class.coin_class is None, (
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"Ledger ({}) which this coin ({}) references is already referenced by another "
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"coin ({}). One to one relationship between a coin and a ledger is strictly and "
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"automatically enforced. Make sure that coin_class=None in the ledger and that "
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"another Coin isn't already referencing this Ledger."
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).format(cls.ledger_class.__name__, name, cls.ledger_class.coin_class.__name__)
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# create back reference from ledger to the coin
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cls.ledger_class.coin_class = cls
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return cls
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@classmethod
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def get_coin_class(mcs, coin_id): # type: (str) -> Type[BaseCoin]
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return mcs.coins[coin_id]
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class BaseCoin(six.with_metaclass(CoinRegistry)):
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name = None
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symbol = None
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network = None
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ledger_class = None # type: Type[BaseLedger]
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transaction_class = None # type: Type[BaseTransaction]
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secret_prefix = None
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pubkey_address_prefix = None
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script_address_prefix = None
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extended_public_key_prefix = None
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extended_private_key_prefix = None
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def __init__(self, ledger, fee_per_byte):
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self.ledger = ledger
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self.fee_per_byte = fee_per_byte
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@classmethod
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def get_id(cls):
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return '{}_{}'.format(cls.symbol.lower(), cls.network.lower())
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def to_dict(self):
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return {'fee_per_byte': self.fee_per_byte}
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def get_input_output_fee(self, io):
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""" Fee based on size of the input / output. """
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return self.fee_per_byte * io.size
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def get_transaction_base_fee(self, tx):
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""" Fee for the transaction header and all outputs; without inputs. """
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return self.fee_per_byte * tx.base_size
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def hash160_to_address(self, h160):
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raw_address = self.pubkey_address_prefix + h160
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return Base58.encode(bytearray(raw_address + double_sha256(raw_address)[0:4]))
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@staticmethod
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def address_to_hash160(address):
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bytes = Base58.decode(address)
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prefix, pubkey_bytes, addr_checksum = bytes[0], bytes[1:21], bytes[21:]
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return pubkey_bytes
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def public_key_to_address(self, public_key):
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return self.hash160_to_address(hash160(public_key))
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@staticmethod
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def private_key_to_wif(private_key):
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return b'\x1c' + private_key + b'\x01'
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