openethereum/util/src/error.rs

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// Copyright 2015, 2016 Ethcore (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/>.
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//! General error types for use in ethcore.
use rustc_serialize::hex::FromHexError;
use network::NetworkError;
use rlp::DecoderError;
use io;
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use std::fmt;
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use hash::H256;
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#[derive(Debug)]
/// Error in database subsystem.
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pub enum BaseDataError {
/// An entry was removed more times than inserted.
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NegativelyReferencedHash(H256),
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}
#[derive(Debug)]
/// General error type which should be capable of representing all errors in ethcore.
pub enum UtilError {
/// Error concerning the crypto utility subsystem.
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Crypto(::crypto::CryptoError),
/// Error concerning the Rust standard library's IO subsystem.
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StdIo(::std::io::Error),
/// Error concerning our IO utility subsystem.
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Io(io::IoError),
/// Error concerning the network address parsing subsystem.
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AddressParse(::std::net::AddrParseError),
/// Error concerning the network address resolution subsystem.
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AddressResolve(Option<::std::io::Error>),
/// Error concerning the hex conversion logic.
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FromHex(FromHexError),
/// Error concerning the database abstraction logic.
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BaseData(BaseDataError),
/// Error concerning the network subsystem.
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Network(NetworkError),
/// Error concerning the RLP decoder.
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Decoder(DecoderError),
/// Miscellaneous error described by a string.
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SimpleString(String),
/// Error from a bad input size being given for the needed output.
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BadSize,
}
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#[derive(Debug, PartialEq, Eq)]
/// Error indicating an expected value was not found.
pub struct Mismatch<T: fmt::Debug> {
/// Value expected.
pub expected: T,
/// Value found.
pub found: T,
}
#[derive(Debug, PartialEq, Eq)]
/// Error indicating value found is outside of a valid range.
pub struct OutOfBounds<T: fmt::Debug> {
/// Minimum allowed value.
pub min: Option<T>,
/// Maximum allowed value.
pub max: Option<T>,
/// Value found.
pub found: T,
}
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impl From<FromHexError> for UtilError {
fn from(err: FromHexError) -> UtilError {
UtilError::FromHex(err)
}
}
impl From<BaseDataError> for UtilError {
fn from(err: BaseDataError) -> UtilError {
UtilError::BaseData(err)
}
}
impl From<NetworkError> for UtilError {
fn from(err: NetworkError) -> UtilError {
UtilError::Network(err)
}
}
impl From<::std::io::Error> for UtilError {
fn from(err: ::std::io::Error) -> UtilError {
UtilError::StdIo(err)
}
}
impl From<io::IoError> for UtilError {
fn from(err: io::IoError) -> UtilError {
UtilError::Io(err)
}
}
impl From<::crypto::CryptoError> for UtilError {
fn from(err: ::crypto::CryptoError) -> UtilError {
UtilError::Crypto(err)
}
}
impl From<::std::net::AddrParseError> for UtilError {
fn from(err: ::std::net::AddrParseError) -> UtilError {
UtilError::AddressParse(err)
}
}
impl From<::rlp::DecoderError> for UtilError {
fn from(err: ::rlp::DecoderError) -> UtilError {
UtilError::Decoder(err)
}
}
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impl From<String> for UtilError {
fn from(err: String) -> UtilError {
UtilError::SimpleString(err)
}
}
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// TODO: uncomment below once https://github.com/rust-lang/rust/issues/27336 sorted.
/*#![feature(concat_idents)]
macro_rules! assimilate {
($name:ident) => (
impl From<concat_idents!($name, Error)> for Error {
fn from(err: concat_idents!($name, Error)) -> Error {
Error:: $name (err)
}
}
)
}
assimilate!(FromHex);
assimilate!(BaseData);*/