lbry-sdk/lbrynet/wallet/transaction.py

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import struct
from binascii import hexlify, unhexlify
from typing import List, Iterable # pylint: disable=unused-import
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from .account import Account # pylint: disable=unused-import
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from torba.basetransaction import BaseTransaction, BaseInput, BaseOutput
from torba.hash import hash160
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from lbryschema.claim import ClaimDict # pylint: disable=unused-import
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from .script import InputScript, OutputScript
class Input(BaseInput):
script: InputScript
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script_class = InputScript
class Output(BaseOutput):
script: OutputScript
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script_class = OutputScript
def get_fee(self, ledger):
name_fee = 0
if self.script.is_claim_name:
name_fee = len(self.script.values['claim_name']) * ledger.fee_per_name_char
return max(name_fee, super().get_fee(ledger))
@property
def claim_id(self) -> str:
if self.script.is_claim_name:
claim_id = hash160(self.tx_ref.hash + struct.pack('>I', self.position))
elif self.script.is_update_claim or self.script.is_support_claim:
claim_id = self.script.values['claim_id']
else:
raise ValueError('No claim_id associated.')
return hexlify(claim_id[::-1]).decode()
@property
def claim_name(self) -> str:
if self.script.is_claim_involved:
return self.script.values['claim_name'].decode()
raise ValueError('No claim_name associated.')
@property
def claim(self) -> bytes:
if self.script.is_claim_involved:
return self.script.values['claim']
raise ValueError('No claim associated.')
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@classmethod
def pay_claim_name_pubkey_hash(
cls, amount: int, claim_name: str, claim: bytes, pubkey_hash: bytes) -> 'Output':
script = cls.script_class.pay_claim_name_pubkey_hash(
claim_name.encode(), claim, pubkey_hash)
return cls(amount, script)
@classmethod
def pay_update_claim_pubkey_hash(
cls, amount: int, claim_name: str, claim_id: str, claim: bytes, pubkey_hash: bytes) -> 'Output':
script = cls.script_class.pay_update_claim_pubkey_hash(
claim_name.encode(), unhexlify(claim_id)[::-1], claim, pubkey_hash)
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return cls(amount, script)
class Transaction(BaseTransaction):
input_class = Input
output_class = Output
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@classmethod
def claim(cls, name: str, meta: ClaimDict, amount: int, holding_address: bytes,
funding_accounts: List[Account], change_account: Account):
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ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
claim_output = Output.pay_claim_name_pubkey_hash(
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amount, name, meta.serialized, ledger.address_to_hash160(holding_address)
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)
return cls.create([], [claim_output], funding_accounts, change_account)
@classmethod
def update(cls, previous_claim: Output, meta: ClaimDict, amount: int, holding_address: bytes,
funding_accounts: List[Account], change_account: Account):
ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
updated_claim = Output.pay_update_claim_pubkey_hash(
amount, previous_claim.claim_name, previous_claim.claim_id,
meta.serialized, ledger.address_to_hash160(holding_address)
)
return cls.create([Input.spend(previous_claim)], [updated_claim], funding_accounts, change_account)
@classmethod
def abandon(cls, claims: Iterable[Output], funding_accounts: Iterable[Account], change_account: Account):
return cls.create([Input.spend(txo) for txo in claims], [], funding_accounts, change_account)