feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

pezkuwi/xcm/xcm-executor/src/traits/fee_manager.rs

@@ -0,0 +1,72 @@
+// Copyright (C) Parity Technologies (UK) Ltd.
+// This file is part of Pezkuwi.
+
+// Pezkuwi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Pezkuwi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Pezkuwi.  If not, see <http://www.gnu.org/licenses/>.
+
+use xcm::prelude::*;
+
+/// Handle stuff to do with taking fees in certain XCM instructions.
+pub trait FeeManager {
+	/// Determine if a fee should be waived.
+	fn is_waived(origin: Option<&Location>, r: FeeReason) -> bool;
+
+	/// Do something with the fee which has been paid. Doing nothing here silently burns the
+	/// fees.
+	fn handle_fee(fee: Assets, context: Option<&XcmContext>, r: FeeReason);
+}
+
+/// Context under which a fee is paid.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum FeeReason {
+	/// When a reporting instruction is called.
+	Report,
+	/// When the `TransferReserveAsset` instruction is called.
+	TransferReserveAsset,
+	/// When the `DepositReserveAsset` instruction is called.
+	DepositReserveAsset,
+	/// When the `InitiateReserveWithdraw` instruction is called.
+	InitiateReserveWithdraw,
+	/// When the `InitiateTeleport` instruction is called.
+	InitiateTeleport,
+	/// When the `InitiateTransfer` instruction is called.
+	InitiateTransfer,
+	/// When the `QueryPallet` instruction is called.
+	QueryPallet,
+	/// When the `ExportMessage` instruction is called (and includes the network ID).
+	Export { network: NetworkId, destination: InteriorLocation },
+	/// The `charge_fees` API.
+	ChargeFees,
+	/// When the `LockAsset` instruction is called.
+	LockAsset,
+	/// When the `RequestUnlock` instruction is called.
+	RequestUnlock,
+}
+
+impl FeeManager for () {
+	fn is_waived(_: Option<&Location>, _: FeeReason) -> bool {
+		false
+	}
+
+	fn handle_fee(_: Assets, _: Option<&XcmContext>, _: FeeReason) {}
+}
+
+pub struct WaiveDeliveryFees;
+
+impl FeeManager for WaiveDeliveryFees {
+	fn is_waived(_: Option<&Location>, _: FeeReason) -> bool {
+		true
+	}
+
+	fn handle_fee(_: Assets, _: Option<&XcmContext>, _: FeeReason) {}
+}