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// Copyright 2019-2021 Parity Technologies (UK) Ltd.
// This file is part of Parity Bridges Common.
// Parity Bridges Common 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.
// Parity Bridges Common 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 Parity Bridges Common. If not, see <http://www.gnu.org/licenses/>.
//! Relay errors.
use relay_substrate_client as client;
use sp_finality_grandpa::AuthorityList;
use sp_runtime::traits::MaybeDisplay;
use std::fmt::Debug;
use thiserror::Error;
/// Relay errors.
#[derive(Error, Debug)]
pub enum Error<Hash: Debug + MaybeDisplay, HeaderNumber: Debug + MaybeDisplay> {
/// Failed to submit signed extrinsic from to the target chain.
#[error("Failed to submit {0} transaction: {1:?}")]
SubmitTransaction(&'static str, client::Error),
/// Failed subscribe to justification stream of the source chain.
#[error("Failed to subscribe to {0} justifications: {1:?}")]
Subscribe(&'static str, client::Error),
/// Failed subscribe to read justification from the source chain (client error).
#[error("Failed to read {0} justification from the stream: {1}")]
ReadJustification(&'static str, client::Error),
/// Failed subscribe to read justification from the source chain (stream ended).
#[error("Failed to read {0} justification from the stream: stream has ended unexpectedly")]
ReadJustificationStreamEnded(&'static str),
/// Failed subscribe to decode justification from the source chain.
#[error("Failed to decode {0} justification: {1:?}")]
DecodeJustification(&'static str, codec::Error),
/// GRANDPA authorities read from the source chain are invalid.
#[error("Read invalid {0} authorities set: {1:?}")]
ReadInvalidAuthorities(&'static str, AuthorityList),
/// Failed to guess initial GRANDPA authorities at the given header of the source chain.
#[error("Failed to guess initial {0} GRANDPA authorities set id: checked all possible ids in range [0; {1}]")]
GuessInitialAuthorities(&'static str, HeaderNumber),
/// Failed to retrieve GRANDPA authorities at the given header from the source chain.
#[error("Failed to retrive {0} GRANDPA authorities set at header {1}: {2:?}")]
RetrieveAuthorities(&'static str, Hash, client::Error),
/// Failed to decode GRANDPA authorities at the given header of the source chain.
#[error("Failed to decode {0} GRANDPA authorities set at header {1}: {2:?}")]
DecodeAuthorities(&'static str, Hash, codec::Error),
/// Failed to retrieve header by the hash from the source chain.
#[error("Failed to retrieve {0} header with hash {1}: {:?}")]
RetrieveHeader(&'static str, Hash, client::Error),
}