from decimal import Decimal
from typing import Optional, Union
from .. import xdr as stellar_xdr
from ..asset import Asset
from ..muxed_account import MuxedAccount
from ..price import Price
from ..utils import raise_if_not_valid_amount
from .operation import Operation
__all__ = ["ManageSellOffer"]
[docs]
class ManageSellOffer(Operation):
"""The :class:`ManageSellOffer` object, which represents a ManageSellOffer
operation on Stellar's network.
Creates, updates, or deletes an sell offer.
If you want to create a new offer set `offer_id` to ``0``.
If you want to update an existing offer set `offer_id` to existing offer ID.
If you want to delete an existing offer set `offer_id` to existing offer ID
and set `amount` to ``0``.
Threshold: Medium
See `Manage Sell Offer <https://developers.stellar.org/docs/start/list-of-operations/#manage-sell-offer>`_ for more information.
:param selling: What you're selling.
:param buying: What you're buying.
:param amount: The total amount you're selling. If ``0``, deletes the offer.
:param price: Price of 1 unit of `selling` in terms of `buying`.
:param offer_id: If ``0``, will create a new offer (default). Otherwise,
edits an existing offer.
:param source: The source account for the operation. Defaults to the transaction's source account.
"""
_XDR_OPERATION_TYPE: stellar_xdr.OperationType = (
stellar_xdr.OperationType.MANAGE_SELL_OFFER
)
def __init__(
self,
selling: Asset,
buying: Asset,
amount: Union[str, Decimal],
price: Union[Price, str, Decimal],
offer_id: int = 0,
source: Optional[Union[MuxedAccount, str]] = None,
) -> None:
super().__init__(source)
if not isinstance(price, Price):
price = Price.from_raw_price(price)
self.selling: Asset = selling
self.buying: Asset = buying
self.amount: str = str(amount)
self.price: Price = price
self.offer_id: int = offer_id
raise_if_not_valid_amount(self.amount, "amount")
def _to_operation_body(self) -> stellar_xdr.OperationBody:
selling = self.selling.to_xdr_object()
buying = self.buying.to_xdr_object()
price = self.price.to_xdr_object()
amount = stellar_xdr.Int64(Operation.to_xdr_amount(self.amount))
manage_sell_offer_op = stellar_xdr.ManageSellOfferOp(
selling, buying, amount, price, stellar_xdr.Int64(self.offer_id)
)
body = stellar_xdr.OperationBody(
type=self._XDR_OPERATION_TYPE, manage_sell_offer_op=manage_sell_offer_op
)
return body
[docs]
@classmethod
def from_xdr_object(cls, xdr_object: stellar_xdr.Operation) -> "ManageSellOffer":
"""Creates a :class:`ManageSellOffer` object from an XDR Operation object."""
source = Operation.get_source_from_xdr_obj(xdr_object)
assert xdr_object.body.manage_sell_offer_op is not None
selling = Asset.from_xdr_object(xdr_object.body.manage_sell_offer_op.selling)
buying = Asset.from_xdr_object(xdr_object.body.manage_sell_offer_op.buying)
amount = Operation.from_xdr_amount(
xdr_object.body.manage_sell_offer_op.amount.int64
)
price = Price.from_xdr_object(xdr_object.body.manage_sell_offer_op.price)
offer_id = xdr_object.body.manage_sell_offer_op.offer_id.int64
op = cls(
source=source,
selling=selling,
buying=buying,
amount=amount,
price=price,
offer_id=offer_id,
)
return op
def __str__(self):
return (
f"<ManageSellOffer [selling={self.selling}, buying={self.buying}, "
f"amount={self.amount}, price={self.price}, offer_id={self.offer_id}, source={self.source}]>"
)