openethereum/util/src/error.rs

67 lines
1.8 KiB
Rust

// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity 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 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. If not, see <http://www.gnu.org/licenses/>.
//! General error types for use in ethcore.
#![allow(missing_docs)]
#![allow(unknown_lints)]
use std::{self, fmt};
use rustc_hex::FromHexError;
use rlp::DecoderError;
use bigint::hash::H256;
#[derive(Debug)]
/// Error in database subsystem.
pub enum BaseDataError {
/// An entry was removed more times than inserted.
NegativelyReferencedHash(H256),
/// A committed value was inserted more than once.
AlreadyExists(H256),
}
impl fmt::Display for BaseDataError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
BaseDataError::NegativelyReferencedHash(hash) =>
write!(f, "Entry {} removed from database more times than it was added.", hash),
BaseDataError::AlreadyExists(hash) =>
write!(f, "Committed key already exists in database: {}", hash),
}
}
}
impl std::error::Error for BaseDataError {
fn description(&self) -> &str {
"Error in database subsystem"
}
}
error_chain! {
types {
UtilError, ErrorKind, ResultExt, Result;
}
foreign_links {
Io(::std::io::Error);
FromHex(FromHexError);
Decoder(DecoderError);
Snappy(::snappy::InvalidInput);
BaseData(BaseDataError);
}
}