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// Copyright 2021 Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Polkadot is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
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use frame_support::storage::{with_transaction, TransactionOutcome};
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use sp_runtime::DispatchError;
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use xcm::latest::prelude::*;
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use xcm_executor::traits::ProcessTransaction;
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/// Transactional processor implementation using frame transactional layers.
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pub struct FrameTransactionalProcessor;
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impl ProcessTransaction for FrameTransactionalProcessor {
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	const IS_TRANSACTIONAL: bool = true;
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	fn process<F>(f: F) -> Result<(), XcmError>
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	where
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		F: FnOnce() -> Result<(), XcmError>,
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	{
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		with_transaction(|| -> TransactionOutcome<Result<_, DispatchError>> {
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			let output = f();
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			match &output {
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				Ok(()) => TransactionOutcome::Commit(Ok(output)),
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				_ => TransactionOutcome::Rollback(Ok(output)),
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			}
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		})
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		.map_err(|_| XcmError::ExceedsStackLimit)?
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	}
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}