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// This file is part of Substrate.

// Copyright (C) 2018-2020 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program 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.

// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
//! Transaction pool error.

use sp_transaction_pool::error::Error as TxPoolError;

/// Transaction pool result.
pub type Result<T> = std::result::Result<T, Error>;

/// Transaction pool error type.
#[derive(Debug, derive_more::Display, derive_more::From)]
pub enum Error {
	/// Pool error.
	Pool(TxPoolError),
	/// Blockchain error.
	Blockchain(sp_blockchain::Error),
	/// Error while converting a `BlockId`.
	#[from(ignore)]
	BlockIdConversion(String),
	/// Error while calling the runtime api.
	#[from(ignore)]
	RuntimeApi(String),
}

impl std::error::Error for Error {
	fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
		match self {
			Error::Pool(ref err) => Some(err),
			Error::Blockchain(ref err) => Some(err),
			Error::BlockIdConversion(_) => None,
			Error::RuntimeApi(_) => None,
		}
	}
}

impl sp_transaction_pool::error::IntoPoolError for Error {
	fn into_pool_error(self) -> std::result::Result<TxPoolError, Self> {
		match self {
			Error::Pool(e) => Ok(e),
			e => Err(e),
		}
	}
}