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// This file is part of Substrate.
// Copyright (C) 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/>.
use codec::{Decode, Encode};
use mixnet::core::PostErr;
/// Error handling a request. Sent in replies over the mixnet.
#[derive(Debug, thiserror::Error, Decode, Encode)]
pub enum RemoteErr {
/// An error that doesn't map to any of the other variants.
#[error("{0}")]
Other(String),
/// Failed to decode the request.
#[error("Failed to decode the request: {0}")]
Decode(String),
}
/// Mixnet error.
#[derive(Debug, thiserror::Error)]
pub enum Error {
/// Failed to communicate with the mixnet service. Possibly it panicked. The node probably
/// needs to be restarted.
#[error(
"Failed to communicate with the mixnet service; the node probably needs to be restarted"
)]
ServiceUnavailable,
/// Did not receive a reply after the configured number of attempts.
#[error("Did not receive a reply from the mixnet after the configured number of attempts")]
NoReply,
/// Received a malformed reply.
#[error("Received a malformed reply from the mixnet")]
BadReply,
/// Failed to post the request to the mixnet. Note that some [`PostErr`] variants, eg
/// [`PostErr::NotEnoughSpaceInQueue`], are handled internally and will never be returned from
/// the top-level API.
#[error("Failed to post the request to the mixnet: {0}")]
Post(#[from] PostErr),
/// Error reported by destination mixnode.
#[error("Error reported by the destination mixnode: {0}")]
Remote(#[from] RemoteErr),
}