from decimal import Decimal
from typing import List, Optional, Union
from .. import xdr as stellar_xdr
from ..asset import Asset
from ..muxed_account import MuxedAccount
from ..type_checked import type_checked
from ..utils import raise_if_not_valid_amount
from .operation import Operation
__all__ = ["PathPaymentStrictSend"]
[docs]@type_checked
class PathPaymentStrictSend(Operation):
"""The :class:`PathPaymentStrictSend` object, which represents a PathPaymentStrictSend
operation on Stellar's network.
Sends an amount in a specific asset to a destination account through a path
of offers. This allows the asset sent (e.g, 450 XLM) to be different from
the asset received (e.g, 6 BTC).
Threshold: Medium
See `Path Payment Strict Send <https://developers.stellar.org/docs/start/list-of-operations/#path-payment-strict-send>`_ for more information.
:param destination: The destination account to send to.
:param send_asset: The `asset` to pay with.
:param send_amount: Amount of `send_asset` to send.
:param dest_asset: The asset the `destination` will receive.
:param dest_min: The minimum amount of `dest_asset` to be received.
:param path: A list of Asset objects to use as the path.
:param source: The source account for the operation. Defaults to the
transaction's source account.
"""
_XDR_OPERATION_TYPE: stellar_xdr.OperationType = (
stellar_xdr.OperationType.PATH_PAYMENT_STRICT_SEND
)
def __init__(
self,
destination: Union[MuxedAccount, str],
send_asset: Asset,
send_amount: Union[str, Decimal],
dest_asset: Asset,
dest_min: Union[str, Decimal],
path: List[Asset],
source: Optional[Union[MuxedAccount, str]] = None,
) -> None:
super().__init__(source)
if isinstance(destination, str):
destination = MuxedAccount.from_account(destination)
self.destination: MuxedAccount = destination
self.send_asset: Asset = send_asset
self.send_amount: str = str(send_amount)
self.dest_asset: Asset = dest_asset
self.dest_min: str = str(dest_min)
self.path: List[Asset] = path # a list of paths/assets
raise_if_not_valid_amount(self.send_amount, "send_amount")
raise_if_not_valid_amount(self.dest_min, "dest_min")
def _to_operation_body(self) -> stellar_xdr.OperationBody:
destination = self.destination.to_xdr_object()
send_asset = self.send_asset.to_xdr_object()
dest_asset = self.dest_asset.to_xdr_object()
path = [asset.to_xdr_object() for asset in self.path]
path_payment_strict_send_op = stellar_xdr.PathPaymentStrictSendOp(
send_asset,
stellar_xdr.Int64(Operation.to_xdr_amount(self.send_amount)),
destination,
dest_asset,
stellar_xdr.Int64(Operation.to_xdr_amount(self.dest_min)),
path,
)
body = stellar_xdr.OperationBody(
type=self._XDR_OPERATION_TYPE,
path_payment_strict_send_op=path_payment_strict_send_op,
)
return body
[docs] @classmethod
def from_xdr_object(
cls, xdr_object: stellar_xdr.Operation
) -> "PathPaymentStrictSend":
"""Creates a :class:`PathPaymentStrictSend` object from an XDR Operation
object.
"""
source = Operation.get_source_from_xdr_obj(xdr_object)
assert xdr_object.body.path_payment_strict_send_op is not None
destination = MuxedAccount.from_xdr_object(
xdr_object.body.path_payment_strict_send_op.destination
)
send_asset = Asset.from_xdr_object(
xdr_object.body.path_payment_strict_send_op.send_asset
)
dest_asset = Asset.from_xdr_object(
xdr_object.body.path_payment_strict_send_op.dest_asset
)
send_amount = Operation.from_xdr_amount(
xdr_object.body.path_payment_strict_send_op.send_amount.int64
)
dest_min = Operation.from_xdr_amount(
xdr_object.body.path_payment_strict_send_op.dest_min.int64
)
path = []
# In fact, we don't need to check it.
if xdr_object.body.path_payment_strict_send_op.path:
for x in xdr_object.body.path_payment_strict_send_op.path:
path.append(Asset.from_xdr_object(x))
op = cls(
source=source,
destination=destination,
send_asset=send_asset,
send_amount=send_amount,
dest_asset=dest_asset,
dest_min=dest_min,
path=path,
)
return op
def __str__(self):
return (
f"<PathPaymentStrictSend [destination={self.destination}, send_asset={self.send_asset}, "
f"send_amount={self.send_amount}, dest_asset={self.dest_asset}, dest_min={self.dest_min}, "
f"path={self.path}, source={self.source}]>"
)