openethereum/ethcore/light/src/net/error.rs
2017-11-13 16:48:58 +01:00

125 lines
4.0 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/>.
//! Defines error types and levels of punishment to use upon
//! encountering.
use std::fmt;
use {rlp, network};
/// Levels of punishment.
///
/// Currently just encompasses two different kinds of disconnect and
/// no punishment, but this is where reputation systems might come into play.
// In ascending order
#[derive(Debug, PartialEq, Eq)]
pub enum Punishment {
/// Perform no punishment.
None,
/// Disconnect the peer, but don't prevent them from reconnecting.
Disconnect,
/// Disconnect the peer and prevent them from reconnecting.
Disable,
}
/// Kinds of errors which can be encountered in the course of LES.
#[derive(Debug)]
pub enum Error {
/// An RLP decoding error.
Rlp(rlp::DecoderError),
/// A network error.
Network(network::Error),
/// Out of credits.
NoCredits,
/// Unrecognized packet code.
UnrecognizedPacket(u8),
/// Unexpected handshake.
UnexpectedHandshake,
/// Peer on wrong network (wrong NetworkId or genesis hash)
WrongNetwork,
/// Unknown peer.
UnknownPeer,
/// Unsolicited response.
UnsolicitedResponse,
/// Bad back-reference in request.
BadBackReference,
/// Not a server.
NotServer,
/// Unsupported protocol version.
UnsupportedProtocolVersion(u8),
/// Bad protocol version.
BadProtocolVersion,
/// Peer is overburdened.
Overburdened,
/// No handler kept the peer.
RejectedByHandlers,
}
impl Error {
/// What level of punishment does this error warrant?
pub fn punishment(&self) -> Punishment {
match *self {
Error::Rlp(_) => Punishment::Disable,
Error::Network(_) => Punishment::None,
Error::NoCredits => Punishment::Disable,
Error::UnrecognizedPacket(_) => Punishment::Disconnect,
Error::UnexpectedHandshake => Punishment::Disconnect,
Error::WrongNetwork => Punishment::Disable,
Error::UnknownPeer => Punishment::Disconnect,
Error::UnsolicitedResponse => Punishment::Disable,
Error::BadBackReference => Punishment::Disable,
Error::NotServer => Punishment::Disable,
Error::UnsupportedProtocolVersion(_) => Punishment::Disable,
Error::BadProtocolVersion => Punishment::Disable,
Error::Overburdened => Punishment::None,
Error::RejectedByHandlers => Punishment::Disconnect,
}
}
}
impl From<rlp::DecoderError> for Error {
fn from(err: rlp::DecoderError) -> Self {
Error::Rlp(err)
}
}
impl From<network::Error> for Error {
fn from(err: network::Error) -> Self {
Error::Network(err)
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::Rlp(ref err) => err.fmt(f),
Error::Network(ref err) => err.fmt(f),
Error::NoCredits => write!(f, "Out of request credits"),
Error::UnrecognizedPacket(code) => write!(f, "Unrecognized packet: 0x{:x}", code),
Error::UnexpectedHandshake => write!(f, "Unexpected handshake"),
Error::WrongNetwork => write!(f, "Wrong network"),
Error::UnknownPeer => write!(f, "Unknown peer"),
Error::UnsolicitedResponse => write!(f, "Peer provided unsolicited data"),
Error::BadBackReference => write!(f, "Bad back-reference in request."),
Error::NotServer => write!(f, "Peer not a server."),
Error::UnsupportedProtocolVersion(pv) => write!(f, "Unsupported protocol version: {}", pv),
Error::BadProtocolVersion => write!(f, "Bad protocol version in handshake"),
Error::Overburdened => write!(f, "Peer overburdened"),
Error::RejectedByHandlers => write!(f, "No handler kept this peer"),
}
}
}