stellar_sdk.operation.change_trust 源代码

from decimal import Decimal
from typing import Union

from .operation import Operation
from .utils import check_amount
from ..asset import Asset
from ..xdr import Xdr

[文档]class ChangeTrust(Operation): """The :class:`ChangeTrust` object, which represents a ChangeTrust operation on Stellar's network. Creates, updates, or deletes a trustline. For more on trustlines, please refer to the `assets documentation <>_`. Threshold: Medium :param asset: The asset for the trust line. :param limit: The limit for the asset, defaults to max int64(922337203685.4775807). If the limit is set to "0" it deletes the trustline. :param source: The source account (defaults to transaction source). """ _DEFAULT_LIMIT = "922337203685.4775807" def __init__( self, asset: Asset, limit: Union[str, Decimal] = None, source: str = None, ) -> None: super().__init__(source) self.asset: Asset = asset if ( limit is None ): # We don't need this if the user can send the value with correct type. self.limit: Union[str, Decimal] = self._DEFAULT_LIMIT else: check_amount(limit) self.limit = limit @classmethod def type_code(cls) -> int: return Xdr.const.CHANGE_TRUST def _to_operation_body(self) -> Xdr.nullclass: line = self.asset.to_xdr_object() limit = Operation.to_xdr_amount(self.limit) change_trust_op = Xdr.types.ChangeTrustOp(line, limit) body = Xdr.nullclass() body.type = Xdr.const.CHANGE_TRUST body.changeTrustOp = change_trust_op return body
[文档] @classmethod def from_xdr_object( cls, operation_xdr_object: Xdr.types.Operation ) -> "ChangeTrust": """Creates a :class:`ChangeTrust` object from an XDR Operation object. """ source = Operation.get_source_from_xdr_obj(operation_xdr_object) line = Asset.from_xdr_object(operation_xdr_object.body.changeTrustOp.line) limit = Operation.from_xdr_amount(operation_xdr_object.body.changeTrustOp.limit) op = cls(source=source, asset=line, limit=limit) op._source_muxed = Operation.get_source_muxed_from_xdr_obj(operation_xdr_object) return op