Die error_chain, die (#10747)

* Replace error chain for network error

* Fix usages and add manual From impls

* OnDemand Error and remove remaining dependencies

* Die error_chain, die.

* DIE

* Hasta la vista, baby

Cargo.lock

@@ -1013,6 +1013,7 @@ version = "1.12.0"
 dependencies = [
  "bincode 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "common-types 0.1.0",
+ "derive_more 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore 1.12.0",
  "ethcore-blockchain 0.1.0",
@@ -1106,7 +1107,7 @@ name = "ethcore-network"
 version = "1.12.0"
 dependencies = [
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "derive_more 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-io 1.12.0",
  "ethereum-types 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethkey 0.3.0",
@@ -1243,7 +1244,7 @@ name = "ethcore-service"
 version = "0.1.0"
 dependencies = [
  "ansi_term 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "derive_more 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore 1.12.0",
  "ethcore-blockchain 0.1.0",
  "ethcore-db 0.1.0",

ethcore/light/Cargo.toml

@@ -10,6 +10,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 log = "0.4"
 parity-bytes = "0.1"
 common-types = { path = "../types" }
+derive_more = "0.14.0"
 ethcore = { path = ".."}
 ethcore-db = { path = "../db" }
 ethcore-blockchain = { path = "../blockchain" }

ethcore/light/src/client/header_chain.rs

@@ -260,7 +260,7 @@ impl HeaderChain {
 			let best_block = {
 				let era = match candidates.get(&curr.best_num) {
 					Some(era) => era,
-					None => bail!("Database corrupt: highest block referenced but no data."),
+					None => return Err("Database corrupt: highest block referenced but no data.".into()),
 				};
 
 				let best = &era.candidates[0];
@@ -582,7 +582,7 @@ impl HeaderChain {
 					} else {
 						let msg = format!("header of block #{} not found in DB ; database in an \
 											inconsistent state", h_num);
-						bail!(msg);
+						return Err(msg.into());
 					};
 
 					let decoded = header.decode().expect("decoding db value failed");

ethcore/light/src/lib.rs

@@ -86,8 +86,7 @@ extern crate keccak_hash as hash;
 extern crate triehash_ethereum as triehash;
 extern crate kvdb;
 extern crate memory_cache;
-#[macro_use]
+extern crate derive_more;
-extern crate error_chain;
 
 #[cfg(test)]
 extern crate kvdb_memorydb;

ethcore/light/src/on_demand/mod.rs

@@ -66,32 +66,31 @@ pub const DEFAULT_NUM_CONSECUTIVE_FAILED_REQUESTS: usize = 1;
 
 /// OnDemand related errors
 pub mod error {
-	// Silence: `use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting`
-	// https://github.com/paritytech/parity-ethereum/issues/10302
-	#![allow(deprecated)]
-
 	use futures::sync::oneshot::Canceled;
 
-	error_chain! {
+	/// OnDemand Error
-
+	#[derive(Debug, derive_more::Display, derive_more::From)]
-		foreign_links {
+	pub enum Error {
-			ChannelCanceled(Canceled) #[doc = "Canceled oneshot channel"];
+		/// Canceled oneshot channel
+		ChannelCanceled(Canceled),
+		/// Timeout bad response
+		BadResponse(String),
+		/// OnDemand requests limit exceeded
+		#[display(fmt = "OnDemand request maximum backoff iterations exceeded")]
+		RequestLimit,
 	}
 
-		errors {
+	impl std::error::Error for Error {
-			#[doc = "Timeout bad response"]
+		fn source(&self) -> Option<&(std::error::Error + 'static)> {
-			BadResponse(err: String) {
+			match self {
-				description("Max response evaluation time exceeded")
+				Error::ChannelCanceled(err) => Some(err),
-				display("{}", err)
+				_ => None,
+			}
+		}
 	}
 
-			#[doc = "OnDemand requests limit exceeded"]
+	/// OnDemand Result
-			RequestLimit {
+	pub type Result<T> = std::result::Result<T, Error>;
-				description("OnDemand request maximum backoff iterations exceeded")
-				display("OnDemand request maximum backoff iterations exceeded")
-			}
-		}
-	}
 }
 
 /// Public interface for performing network requests `OnDemand`
@@ -272,7 +271,7 @@ impl Pending {
 			response_err
 		);
 
-		let err = self::error::ErrorKind::BadResponse(err);
+		let err = self::error::Error::BadResponse(err);
 		if self.sender.send(Err(err.into())).is_err() {
 			debug!(target: "on_demand", "Dropped oneshot channel receiver on no response");
 		}
@@ -280,7 +279,7 @@ impl Pending {
 
 	// returning a peer discovery timeout during query attempts
 	fn request_limit_reached(self) {
-		let err = self::error::ErrorKind::RequestLimit;
+		let err = self::error::Error::RequestLimit;
 		if self.sender.send(Err(err.into())).is_err() {
 			debug!(target: "on_demand", "Dropped oneshot channel receiver on time out");
 		}

ethcore/private-tx/src/lib.rs

@@ -16,10 +16,6 @@
 
 //! Private transactions module.
 
-// Recursion limit required because of
-// error_chain foreign_links.
-#![recursion_limit="256"]
-
 mod encryptor;
 mod key_server_keys;
 mod private_transactions;

ethcore/service/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
 ansi_term = "0.10"
-error-chain = { version = "0.12", default-features = false }
+derive_more = "0.14.0"
 ethcore = { path = ".." }
 ethcore-blockchain = { path = "../blockchain" }
 ethcore-io = { path = "../../util/io" }

ethcore/service/src/error.rs

@@ -14,18 +14,26 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-// Silence: `use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting`
-// https://github.com/paritytech/parity-ethereum/issues/10302
-#![allow(deprecated)]
-
 use ethcore;
 use io;
 use ethcore_private_tx;
 
-error_chain! {
+#[derive(Debug, derive_more::Display, derive_more::From)]
-	foreign_links {
+pub enum Error {
-		Ethcore(ethcore::error::Error);
+	/// Ethcore Error
-		IoError(io::IoError);
+	Ethcore(ethcore::error::Error),
-		PrivateTransactions(ethcore_private_tx::Error);
+	/// Io Error
+	IoError(io::IoError),
+	/// Private Transactions Error
+	PrivateTransactions(ethcore_private_tx::Error),
+}
+
+impl std::error::Error for Error {
+	fn source(&self) -> Option<&(std::error::Error + 'static)> {
+		match self {
+			Error::Ethcore(err) => Some(err),
+			Error::IoError(err) => Some(err),
+			Error::PrivateTransactions(err) => Some(err),
+		}
 	}
 }

ethcore/service/src/lib.rs

@@ -23,8 +23,7 @@ extern crate ethcore_sync as sync;
 extern crate ethereum_types;
 extern crate kvdb;
 
-#[macro_use]
+extern crate derive_more;
-extern crate error_chain;
 #[macro_use]
 extern crate log;
 #[macro_use]
@@ -42,5 +41,5 @@ mod stop_guard;
 #[cfg(test)]
 extern crate kvdb_rocksdb;
 
-pub use error::{Error, ErrorKind};
+pub use error::Error;
 pub use service::{ClientService, PrivateTxService};

ethcore/service/src/service.rs

@@ -59,7 +59,7 @@ impl PrivateTxHandler for PrivateTxService {
 			Ok(import_result) => Ok(import_result),
 			Err(err) => {
 				warn!(target: "privatetx", "Unable to import private transaction packet: {}", err);
-				bail!(err.to_string())
+				return Err(err.to_string())
 			}
 		}
 	}
@@ -69,7 +69,7 @@ impl PrivateTxHandler for PrivateTxService {
 			Ok(import_result) => Ok(import_result),
 			Err(err) => {
 				warn!(target: "privatetx", "Unable to import signed private transaction packet: {}", err);
-				bail!(err.to_string())
+				return Err(err.to_string())
 			}
 		}
 	}

ethcore/src/lib.rs

@@ -54,10 +54,6 @@
 //!   cargo build --release
 //!   ```
 
-// Recursion limit required because of
-// error_chain foreign_links.
-#![recursion_limit="128"]
-
 extern crate ansi_term;
 extern crate bn;
 extern crate byteorder;

ethcore/sync/src/api.rs

@@ -22,7 +22,7 @@ use std::time::Duration;
 use bytes::Bytes;
 use devp2p::NetworkService;
 use network::{NetworkProtocolHandler, NetworkContext, PeerId, ProtocolId,
-	NetworkConfiguration as BasicNetworkConfiguration, NonReservedPeerMode, Error, ErrorKind,
+	NetworkConfiguration as BasicNetworkConfiguration, NonReservedPeerMode, Error,
 	ConnectionFilter};
 use network::client_version::ClientVersion;
 
@@ -593,7 +593,7 @@ impl ChainNotify for EthSync {
 		match self.network.start() {
 			Err((err, listen_address)) => {
 				match err.into() {
-					ErrorKind::Io(ref e) if e.kind() == io::ErrorKind::AddrInUse => {
+					Error::Io(ref e) if e.kind() == io::ErrorKind::AddrInUse => {
 						warn!("Network port {:?} is already in use, make sure that another instance of an Ethereum client is not running or change the port using the --port option.", listen_address.expect("Listen address is not set."))
 					},
 					err => warn!("Error starting network: {}", err),
@@ -983,7 +983,7 @@ impl ManageNetwork for LightSync {
 		match self.network.start() {
 			Err((err, listen_address)) => {
 				match err.into() {
-					ErrorKind::Io(ref e) if e.kind() == io::ErrorKind::AddrInUse => {
+					Error::Io(ref e) if e.kind() == io::ErrorKind::AddrInUse => {
 						warn!("Network port {:?} is already in use, make sure that another instance of an Ethereum client is not running or change the port using the --port option.", listen_address.expect("Listen address is not set."))
 					},
 					err => warn!("Error starting network: {}", err),

ethcore/sync/src/blocks.rs

@@ -435,13 +435,13 @@ impl BlockCollection {
 					},
 					None => {
 						warn!("Got body with no header {}", h);
-						Err(network::ErrorKind::BadProtocol.into())
+						Err(network::Error::BadProtocol)
 					}
 				}
 			}
 			None => {
 				trace!(target: "sync", "Ignored unknown/stale block body. tx_root = {:?}, uncles = {:?}", header_id.transactions_root, header_id.uncles);
-				Err(network::ErrorKind::BadProtocol.into())
+				Err(network::Error::BadProtocol)
 			}
 		}
 	}
@@ -463,7 +463,7 @@ impl BlockCollection {
 						},
 						None => {
 							warn!("Got receipt with no header {}", h);
-							return Err(network::ErrorKind::BadProtocol.into())
+							return Err(network::Error::BadProtocol)
 						}
 					}
 				}
@@ -471,7 +471,7 @@ impl BlockCollection {
 			},
 			hash_map::Entry::Vacant(_) => {
 				trace!(target: "sync", "Ignored unknown/stale block receipt {:?}", receipt_root);
-				Err(network::ErrorKind::BadProtocol.into())
+				Err(network::Error::BadProtocol)
 			}
 		}
 	}

ethcore/sync/src/lib.rs

@@ -76,5 +76,5 @@ mod api;
 pub use api::*;
 pub use chain::{SyncStatus, SyncState};
 pub use devp2p::validate_node_url;
-pub use network::{NonReservedPeerMode, Error, ErrorKind, ConnectionFilter, ConnectionDirection};
+pub use network::{NonReservedPeerMode, Error, ConnectionFilter, ConnectionDirection};
 pub use private_tx::{PrivateTxHandler, NoopPrivateTxHandler, SimplePrivateTxHandler};

miner/src/lib.rs

@@ -41,8 +41,6 @@ extern crate ethabi_contract;
 #[macro_use]
 extern crate ethabi_derive;
 #[macro_use]
-extern crate error_chain;
-#[macro_use]
 extern crate log;
 #[macro_use]
 extern crate serde_derive;

miner/src/pool/verifier.rs

@@ -168,7 +168,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 
 		if self.client.transaction_already_included(&hash) {
 			trace!(target: "txqueue", "[{:?}] Rejected tx already in the blockchain", hash);
-			bail!(transaction::Error::AlreadyImported)
+			return Err(transaction::Error::AlreadyImported)
 		}
 
 		let gas_limit = cmp::min(self.options.tx_gas_limit, self.options.block_gas_limit);
@@ -181,7 +181,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 				self.options.block_gas_limit,
 				self.options.tx_gas_limit,
 			);
-			bail!(transaction::Error::GasLimitExceeded {
+			return Err(transaction::Error::GasLimitExceeded {
 				limit: gas_limit,
 				got: *tx.gas(),
 			});
@@ -196,7 +196,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 				minimal_gas,
 			);
 
-			bail!(transaction::Error::InsufficientGas {
+			return Err(transaction::Error::InsufficientGas {
 				minimal: minimal_gas,
 				got: *tx.gas(),
 			})
@@ -216,7 +216,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 					tx.gas_price(),
 					self.options.minimal_gas_price,
 				);
-				bail!(transaction::Error::InsufficientGasPrice {
+				return Err(transaction::Error::InsufficientGasPrice {
 					minimal: self.options.minimal_gas_price,
 					got: *tx.gas_price(),
 				});
@@ -231,7 +231,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 						tx.gas_price(),
 						vtx.transaction.gas_price,
 					);
-					bail!(transaction::Error::InsufficientGasPrice {
+					return Err(transaction::Error::InsufficientGasPrice {
 						minimal: vtx.transaction.gas_price,
 						got: *tx.gas_price(),
 					});
@@ -247,7 +247,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 				Ok(signed) => signed.into(),
 				Err(err) => {
 					debug!(target: "txqueue", "[{:?}] Rejected tx {:?}", hash, err);
-					bail!(err)
+					return Err(err)
 				},
 			},
 			Transaction::Local(tx) => tx,
@@ -256,7 +256,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 		// Verify RLP payload
 		if let Err(err) = self.client.decode_transaction(&transaction.rlp_bytes()) {
 			debug!(target: "txqueue", "[{:?}] Rejected transaction's rlp payload", err);
-			bail!(err)
+			return Err(err)
 		}
 
 		let sender = transaction.sender();
@@ -276,7 +276,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 					transaction.gas_price,
 					self.options.minimal_gas_price,
 				);
-				bail!(transaction::Error::InsufficientGasPrice {
+				return Err(transaction::Error::InsufficientGasPrice {
 					minimal: self.options.minimal_gas_price,
 					got: transaction.gas_price,
 				});
@@ -291,7 +291,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 				"[{:?}] Rejected tx, price overflow",
 				hash
 			);
-			bail!(transaction::Error::InsufficientBalance {
+			return Err(transaction::Error::InsufficientBalance {
 				cost: U256::max_value(),
 				balance: account_details.balance,
 			});
@@ -304,7 +304,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 				account_details.balance,
 				cost,
 			);
-			bail!(transaction::Error::InsufficientBalance {
+			return Err(transaction::Error::InsufficientBalance {
 				cost: cost,
 				balance: account_details.balance,
 			});
@@ -318,7 +318,7 @@ impl<C: Client> txpool::Verifier<Transaction> for Verifier<C, ::pool::scoring::N
 				transaction.nonce,
 				account_details.nonce,
 			);
-			bail!(transaction::Error::Old);
+			return Err(transaction::Error::Old);
 		}
 
 		let priority = match (is_own || account_details.is_local, is_retracted) {

parity/configuration.rs

@@ -710,7 +710,7 @@ impl Configuration {
 				for line in &lines {
 					match validate_node_url(line).map(Into::into) {
 						None => continue,
-						Some(sync::ErrorKind::AddressResolve(_)) => return Err(format!("Failed to resolve hostname of a boot node: {}", line)),
+						Some(sync::Error::AddressResolve(_)) => return Err(format!("Failed to resolve hostname of a boot node: {}", line)),
 						Some(_) => return Err(format!("Invalid node address format given for a boot node: {}", line)),
 					}
 				}

parity/helpers.rs

@@ -186,7 +186,7 @@ pub fn to_bootnodes(bootnodes: &Option<String>) -> Result<Vec<String>, String> {
 		Some(ref x) if !x.is_empty() => x.split(',').map(|s| {
 			match validate_node_url(s).map(Into::into) {
 				None => Ok(s.to_owned()),
-				Some(sync::ErrorKind::AddressResolve(_)) => Err(format!("Failed to resolve hostname of a boot node: {}", s)),
+				Some(sync::Error::AddressResolve(_)) => Err(format!("Failed to resolve hostname of a boot node: {}", s)),
 				Some(_) => Err(format!("Invalid node address format given for a boot node: {}", s)),
 			}
 		}).collect(),

rpc/src/v1/helpers/errors.rs

@@ -25,7 +25,7 @@ use rlp::DecoderError;
 use types::transaction::Error as TransactionError;
 use ethcore_private_tx::Error as PrivateTransactionError;
 use vm::Error as VMError;
-use light::on_demand::error::{Error as OnDemandError, ErrorKind as OnDemandErrorKind};
+use light::on_demand::error::{Error as OnDemandError};
 use ethcore::client::BlockChainClient;
 use types::blockchain_info::BlockChainInfo;
 use v1::types::BlockNumber;
@@ -555,10 +555,9 @@ pub fn filter_block_not_found(id: BlockId) -> Error {
 
 pub fn on_demand_error(err: OnDemandError) -> Error {
 	match err {
-		OnDemandError(OnDemandErrorKind::ChannelCanceled(e), _) => on_demand_cancel(e),
+		OnDemandError::ChannelCanceled(e) => on_demand_cancel(e),
-		OnDemandError(OnDemandErrorKind::RequestLimit, _) => timeout_new_peer(&err),
+		OnDemandError::RequestLimit => timeout_new_peer(&err),
-		OnDemandError(OnDemandErrorKind::BadResponse(_), _) => max_attempts_reached(&err),
+		OnDemandError::BadResponse(_) => max_attempts_reached(&err),
-		_ => on_demand_others(&err),
 	}
 }
 
@@ -583,14 +582,6 @@ pub fn timeout_new_peer(err: &OnDemandError) -> Error {
 	}
 }
 
-pub fn on_demand_others(err: &OnDemandError) -> Error {
-	Error {
-		code: ErrorCode::ServerError(codes::UNKNOWN_ERROR),
-		message: err.to_string(),
-		data: None,
-	}
-}
-
 pub fn status_error(has_peers: bool) -> Error {
 	if has_peers {
 		no_work()

util/network-devp2p/src/connection.rs

@@ -37,7 +37,7 @@ use tiny_keccak::Keccak;
 use ethkey::crypto;
 use handshake::Handshake;
 use io::{IoContext, StreamToken};
-use network::{Error, ErrorKind};
+use network::Error;
 
 const ENCRYPTED_HEADER_LEN: usize = 32;
 const RECEIVE_PAYLOAD: Duration = Duration::from_secs(30);
@@ -358,7 +358,7 @@ impl EncryptedConnection {
 		let mut header = RlpStream::new();
 		let len = payload.len();
 		if len > MAX_PAYLOAD_SIZE {
-			bail!(ErrorKind::OversizedPacket);
+			return Err(Error::OversizedPacket);
 		}
 		header.append_raw(&[(len >> 16) as u8, (len >> 8) as u8, len as u8], 1);
 		header.append_raw(&[0xc2u8, 0x80u8, 0x80u8], 1);
@@ -386,14 +386,14 @@ impl EncryptedConnection {
 	/// Decrypt and authenticate an incoming packet header. Prepare for receiving payload.
 	fn read_header(&mut self, header: &[u8]) -> Result<(), Error> {
 		if header.len() != ENCRYPTED_HEADER_LEN {
-			return Err(ErrorKind::Auth.into());
+			return Err(Error::Auth);
 		}
 		EncryptedConnection::update_mac(&mut self.ingress_mac, &mut self.mac_encoder, &header[0..16]);
 		let mac = &header[16..];
 		let mut expected = H256::zero();
 		self.ingress_mac.clone().finalize(expected.as_bytes_mut());
 		if mac != &expected[0..16] {
-			return Err(ErrorKind::Auth.into());
+			return Err(Error::Auth);
 		}
 
 		let mut hdec = H128::default();
@@ -422,7 +422,7 @@ impl EncryptedConnection {
 		let padding = (16 - (self.payload_len  % 16)) % 16;
 		let full_length = self.payload_len + padding + 16;
 		if payload.len() != full_length {
-			return Err(ErrorKind::Auth.into());
+			return Err(Error::Auth);
 		}
 		self.ingress_mac.update(&payload[0..payload.len() - 16]);
 		EncryptedConnection::update_mac(&mut self.ingress_mac, &mut self.mac_encoder, &[0u8; 0]);
@@ -430,7 +430,7 @@ impl EncryptedConnection {
 		let mut expected = H128::default();
 		self.ingress_mac.clone().finalize(expected.as_bytes_mut());
 		if mac != &expected[..] {
-			return Err(ErrorKind::Auth.into());
+			return Err(Error::Auth);
 		}
 
 		let mut packet = vec![0u8; self.payload_len];

util/network-devp2p/src/discovery.rs

@@ -27,7 +27,7 @@ use parity_bytes::Bytes;
 use rlp::{Rlp, RlpStream};
 
 use ethkey::{KeyPair, recover, Secret, sign};
-use network::{Error, ErrorKind};
+use network::Error;
 use network::IpFilter;
 use node_table::*;
 use PROTOCOL_VERSION;
@@ -482,12 +482,12 @@ impl<'a> Discovery<'a> {
 	pub fn on_packet(&mut self, packet: &[u8], from: SocketAddr) -> Result<Option<TableUpdates>, Error> {
 		// validate packet
 		if packet.len() < 32 + 65 + 4 + 1 {
-			return Err(ErrorKind::BadProtocol.into());
+			return Err(Error::BadProtocol);
 		}
 
 		let hash_signed = keccak(&packet[32..]);
 		if hash_signed[..] != packet[0..32] {
-			return Err(ErrorKind::BadProtocol.into());
+			return Err(Error::BadProtocol);
 		}
 
 		let signed = &packet[(32 + 65)..];
@@ -512,7 +512,7 @@ impl<'a> Discovery<'a> {
 		let secs_since_epoch = SystemTime::now().duration_since(UNIX_EPOCH).unwrap_or_default().as_secs();
 		if self.check_timestamps && timestamp < secs_since_epoch {
 			debug!(target: "discovery", "Expired packet");
-			return Err(ErrorKind::Expired.into());
+			return Err(Error::Expired);
 		}
 		Ok(())
 	}

util/network-devp2p/src/handshake.rs

@@ -28,7 +28,7 @@ use ethkey::{Generator, KeyPair, Public, Random, recover, Secret, sign};
 use ethkey::crypto::{ecdh, ecies};
 use host::HostInfo;
 use io::{IoContext, StreamToken};
-use network::{Error, ErrorKind};
+use network::Error;
 use node_table::NodeId;
 
 #[derive(PartialEq, Eq, Debug)]
@@ -166,7 +166,7 @@ impl Handshake {
 		trace!(target: "network", "Received handshake auth from {:?}", self.connection.remote_addr_str());
 		if data.len() != V4_AUTH_PACKET_SIZE {
 			debug!(target: "network", "Wrong auth packet size");
-			return Err(ErrorKind::BadProtocol.into());
+			return Err(Error::BadProtocol);
 		}
 		self.auth_cipher = data.to_vec();
 		match ecies::decrypt(secret, &[], data) {
@@ -183,7 +183,7 @@ impl Handshake {
 				let total = ((u16::from(data[0]) << 8 | (u16::from(data[1]))) as usize) + 2;
 				if total < V4_AUTH_PACKET_SIZE {
 					debug!(target: "network", "Wrong EIP8 auth packet size");
-					return Err(ErrorKind::BadProtocol.into());
+					return Err(Error::BadProtocol);
 				}
 				let rest = total - data.len();
 				self.state = HandshakeState::ReadingAuthEip8;
@@ -212,7 +212,7 @@ impl Handshake {
 		trace!(target: "network", "Received handshake ack from {:?}", self.connection.remote_addr_str());
 		if data.len() != V4_ACK_PACKET_SIZE {
 			debug!(target: "network", "Wrong ack packet size");
-			return Err(ErrorKind::BadProtocol.into());
+			return Err(Error::BadProtocol);
 		}
 		self.ack_cipher = data.to_vec();
 		match ecies::decrypt(secret, &[], data) {
@@ -226,7 +226,7 @@ impl Handshake {
 				let total = (((u16::from(data[0])) << 8 | (u16::from(data[1]))) as usize) + 2;
 				if total < V4_ACK_PACKET_SIZE {
 					debug!(target: "network", "Wrong EIP8 ack packet size");
-					return Err(ErrorKind::BadProtocol.into());
+					return Err(Error::BadProtocol);
 				}
 				let rest = total - data.len();
 				self.state = HandshakeState::ReadingAckEip8;

util/network-devp2p/src/host.rs

@@ -44,7 +44,7 @@ use io::*;
 use ip_utils::{map_external_address, select_public_address};
 use network::{NetworkConfiguration, NetworkIoMessage, PacketId, PeerId, ProtocolId};
 use network::{NetworkContext as NetworkContextTrait, NonReservedPeerMode};
-use network::{DisconnectReason, Error, ErrorKind, NetworkProtocolHandler, SessionInfo};
+use network::{DisconnectReason, Error, NetworkProtocolHandler, SessionInfo};
 use network::{ConnectionDirection, ConnectionFilter};
 use network::client_version::ClientVersion;
 use node_table::*;
@@ -157,7 +157,7 @@ impl<'s> NetworkContextTrait for NetworkContext<'s> {
 
 	fn respond(&self, packet_id: PacketId, data: Vec<u8>) -> Result<(), Error> {
 		assert!(self.session.is_some(), "Respond called without network context");
-		self.session_id.map_or_else(|| Err(ErrorKind::Expired.into()), |id| self.send(id, packet_id, data))
+		self.session_id.map_or_else(|| Err(Error::Expired), |id| self.send(id, packet_id, data))
 	}
 
 	fn disable_peer(&self, peer: PeerId) {
@@ -719,8 +719,8 @@ impl Host {
 						Err(e) => {
 							let s = session.lock();
 							trace!(target: "network", "Session read error: {}:{:?} ({:?}) {:?}", token, s.id(), s.remote_addr(), e);
-							match *e.kind() {
+							match e {
-								ErrorKind::Disconnect(DisconnectReason::IncompatibleProtocol) | ErrorKind::Disconnect(DisconnectReason::UselessPeer) => {
+								Error::Disconnect(DisconnectReason::IncompatibleProtocol) | Error::Disconnect(DisconnectReason::UselessPeer) => {
 									if let Some(id) = s.id() {
 										if !self.reserved_nodes.read().contains(id) {
 											let mut nodes = self.nodes.write();

util/network-devp2p/src/lib.rs

@@ -68,8 +68,6 @@ extern crate bytes;
 extern crate crypto as rcrypto;
 #[cfg(test)]
 extern crate env_logger;
-#[macro_use]
-extern crate error_chain;
 extern crate ethcore_io as io;
 extern crate ethcore_network as network;
 extern crate ethereum_types;

util/network-devp2p/src/node_table.rs

@@ -31,7 +31,7 @@ use serde_json;
 
 use discovery::{NodeEntry, TableUpdates};
 use ip_utils::*;
-use network::{AllowIP, Error, ErrorKind, IpFilter};
+use network::{AllowIP, Error, IpFilter};
 
 /// Node public key
 pub type NodeId = H512;
@@ -133,8 +133,8 @@ impl FromStr for NodeEndpoint {
 				address: a,
 				udp_port: a.port()
 			}),
-			Ok(None) => bail!(ErrorKind::AddressResolve(None)),
+			Ok(None) => return Err(Error::AddressResolve(None.into())),
-			Err(_) => Err(ErrorKind::AddressParse.into()) // always an io::Error of InvalidInput kind
+			Err(_) => Err(Error::AddressParse) // always an io::Error of InvalidInput kind
 		}
 	}
 }
@@ -216,7 +216,7 @@ impl FromStr for Node {
 	type Err = Error;
 	fn from_str(s: &str) -> Result<Self, Self::Err> {
 		let (id, endpoint) = if s.len() > 136 && &s[0..8] == "enode://" && &s[136..137] == "@" {
-			(s[8..136].parse().map_err(|_| ErrorKind::InvalidNodeId)?, NodeEndpoint::from_str(&s[137..])?)
+			(s[8..136].parse().map_err(|_| Error::InvalidNodeId)?, NodeEndpoint::from_str(&s[137..])?)
 		}
 		else {
 			(NodeId::default(), NodeEndpoint::from_str(s)?)
@@ -629,21 +629,21 @@ mod tests {
 	fn endpoint_parse_empty_ip_string_returns_error() {
 		let endpoint = NodeEndpoint::from_str("");
 		assert!(endpoint.is_err());
-		assert_matches!(endpoint.unwrap_err().kind(), &ErrorKind::AddressParse);
+		assert_matches!(endpoint.unwrap_err(), Error::AddressParse);
 	}
 
 	#[test]
 	fn endpoint_parse_invalid_ip_string_returns_error() {
 		let endpoint = NodeEndpoint::from_str("beef");
 		assert!(endpoint.is_err());
-		assert_matches!(endpoint.unwrap_err().kind(), &ErrorKind::AddressParse);
+		assert_matches!(endpoint.unwrap_err(), Error::AddressParse);
 	}
 
 	#[test]
 	fn endpoint_parse_valid_ip_without_port_returns_error() {
 		let endpoint = NodeEndpoint::from_str("123.123.123.123");
 		assert!(endpoint.is_err());
-		assert_matches!(endpoint.unwrap_err().kind(), &ErrorKind::AddressParse);
+		assert_matches!(endpoint.unwrap_err(), Error::AddressParse);
 		let endpoint = NodeEndpoint::from_str("123.123.123.123:123");
 		assert!(endpoint.is_ok())
 	}
@@ -668,11 +668,11 @@ mod tests {
 	fn node_parse_fails_for_invalid_urls() {
 		let node = Node::from_str("foo");
 		assert!(node.is_err());
-		assert_matches!(node.unwrap_err().kind(), &ErrorKind::AddressParse);
+		assert_matches!(node.unwrap_err(), Error::AddressParse);
 
 		let node = Node::from_str("enode://foo@bar");
 		assert!(node.is_err());
-		assert_matches!(node.unwrap_err().kind(), &ErrorKind::AddressParse);
+		assert_matches!(node.unwrap_err(), Error::AddressParse);
 	}
 
 	#[test]

util/network-devp2p/src/session.rs

@@ -30,7 +30,7 @@ use connection::{Connection, EncryptedConnection, MAX_PAYLOAD_SIZE, Packet};
 use handshake::Handshake;
 use host::*;
 use io::{IoContext, StreamToken};
-use network::{DisconnectReason, Error, ErrorKind, PeerCapabilityInfo, ProtocolId, SessionInfo};
+use network::{DisconnectReason, Error, PeerCapabilityInfo, ProtocolId, SessionInfo};
 use network::client_version::ClientVersion;
 use network::SessionCapabilityInfo;
 use node_table::NodeId;
@@ -256,10 +256,10 @@ impl Session {
         where Message: Send + Sync + Clone {
 		if protocol.is_some() && (self.info.capabilities.is_empty() || !self.had_hello) {
 			debug!(target: "network", "Sending to unconfirmed session {}, protocol: {:?}, packet: {}", self.token(), protocol.as_ref().map(|p| str::from_utf8(&p[..]).unwrap_or("??")), packet_id);
-			bail!(ErrorKind::BadProtocol);
+			return Err(Error::BadProtocol);
 		}
 		if self.expired() {
-			return Err(ErrorKind::Expired.into());
+			return Err(Error::Expired);
 		}
 		let mut i = 0usize;
 		let pid = match protocol {
@@ -281,7 +281,7 @@ impl Session {
 		let mut payload = data; // create a reference with local lifetime
 		if self.compression {
 			if payload.len() > MAX_PAYLOAD_SIZE {
-				bail!(ErrorKind::OversizedPacket);
+				return Err(Error::OversizedPacket);
 			}
 			let len = snappy::compress_into(&payload, &mut compressed);
 			trace!(target: "network", "compressed {} to {}", payload.len(), len);
@@ -331,16 +331,16 @@ impl Session {
 	fn read_packet<Message>(&mut self, io: &IoContext<Message>, packet: &Packet, host: &HostInfo) -> Result<SessionData, Error>
 	where Message: Send + Sync + Clone {
 		if packet.data.len() < 2 {
-			return Err(ErrorKind::BadProtocol.into());
+			return Err(Error::BadProtocol);
 		}
 		let packet_id = packet.data[0];
 		if packet_id != PACKET_HELLO && packet_id != PACKET_DISCONNECT && !self.had_hello {
-			return Err(ErrorKind::BadProtocol.into());
+			return Err(Error::BadProtocol);
 		}
 		let data = if self.compression {
 			let compressed = &packet.data[1..];
 			if snappy::decompressed_len(&compressed)? > MAX_PAYLOAD_SIZE {
-				bail!(ErrorKind::OversizedPacket);
+				return Err(Error::OversizedPacket);
 			}
 			snappy::decompress(&compressed)?
 		} else {
@@ -358,7 +358,7 @@ impl Session {
 				if self.had_hello {
 					debug!(target:"network", "Disconnected: {}: {:?}", self.token(), DisconnectReason::from_u8(reason));
 				}
-				Err(ErrorKind::Disconnect(DisconnectReason::from_u8(reason)).into())
+				Err(Error::Disconnect(DisconnectReason::from_u8(reason)))
 			}
 			PACKET_PING => {
 				self.send_pong(io)?;
@@ -500,7 +500,7 @@ impl Session {
 			rlp.append(&(reason as u32));
 			self.send_packet(io, None, PACKET_DISCONNECT, &rlp.drain()).ok();
 		}
-		ErrorKind::Disconnect(reason).into()
+		Error::Disconnect(reason)
 	}
 
 	fn send<Message>(&mut self, io: &IoContext<Message>, data: &[u8]) -> Result<(), Error> where Message: Send + Sync + Clone {

util/network/Cargo.toml

@@ -7,7 +7,7 @@ version = "1.12.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-error-chain = { version = "0.12", default-features = false }
+derive_more = "0.14.0"
 parity-crypto = "0.4.0"
 ethcore-io = { path = "../io" }
 ethereum-types = "0.6.0"

util/network/src/error.rs

@@ -14,11 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-// Silence: `use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting`
+use std::{error, io, net, fmt};
-// https://github.com/paritytech/parity-ethereum/issues/10302
-#![allow(deprecated)]
-
-use std::{io, net, fmt};
 use libc::{ENFILE, EMFILE};
 use io::IoError;
 use {rlp, ethkey, crypto, snappy};
@@ -85,118 +81,127 @@ impl fmt::Display for DisconnectReason {
 	}
 }
 
-error_chain! {
+/// Queue error
-	foreign_links {
+#[derive(Debug, derive_more::Display)]
-		SocketIo(IoError) #[doc = "Socket IO error."];
+pub enum Error {
-		Decompression(snappy::InvalidInput) #[doc = "Decompression error."];
+	/// Socket IO error.
-		Rlp(rlp::DecoderError) #[doc = "Rlp decoder error."];
+	SocketIo(IoError),
-	}
+	/// Decompression error.
+	Decompression(snappy::InvalidInput),
+	/// Rlp decoder error.
+	Rlp(rlp::DecoderError),
+	/// Error concerning the network address parsing subsystem.
+	#[display(fmt = "Failed to parse network address")]
+	AddressParse,
+	/// Error concerning the network address resolution subsystem.
+	#[display(fmt = "Failed to resolve network address {}", _0)]
+	AddressResolve(AddressResolveError),
+	/// Authentication failure
+	#[display(fmt = "Authentication failure")]
+	Auth,
+	/// Unrecognised protocol
+	#[display(fmt = "Bad protocol")]
+	BadProtocol,
+	/// Expired message
+	#[display(fmt = "Expired message")]
+	Expired,
+	/// Peer not found
+	#[display(fmt = "Peer not found")]
+	PeerNotFound,
+	/// Peer is disconnected
+	#[display(fmt = "Peer disconnected: {}", _0)]
+	Disconnect(DisconnectReason),
+	/// Invalid node id
+	#[display(fmt = "Invalid node id")]
+	InvalidNodeId,
+	/// Packet size is over the protocol limit
+	#[display(fmt = "Packet is too large")]
+	OversizedPacket,
+	/// Reached system resource limits for this process
+	#[display(fmt = "Too many open files in this process. Check your resource limits and restart parity")]
+	ProcessTooManyFiles,
+	/// Reached system wide resource limits
+	#[display(fmt = "Too many open files on system. Consider closing some processes/release some file handlers or increas the system-wide resource limits and restart parity.")]
+	SystemTooManyFiles,
+	/// An unknown IO error occurred.
+	#[display(fmt = "Unexpected IO error: {}", _0)]
+	Io(io::Error),
+}
 
-	errors {
+/// Wraps io::Error for Display impl
-		#[doc = "Error concerning the network address parsing subsystem."]
+#[derive(Debug)]
-		AddressParse {
+pub struct AddressResolveError(Option<io::Error>);
-			description("Failed to parse network address"),
-			display("Failed to parse network address"),
-		}
 
-		#[doc = "Error concerning the network address resolution subsystem."]
+impl fmt::Display for AddressResolveError {
-		AddressResolve(err: Option<io::Error>) {
+	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-			description("Failed to resolve network address"),
+		write!(f, "{}", self.0.as_ref().map_or("".to_string(), |e| e.to_string()))
-			display("Failed to resolve network address {}", err.as_ref().map_or("".to_string(), |e| e.to_string())),
 	}
+}
 
-		#[doc = "Authentication failure"]
+impl From<Option<io::Error>> for AddressResolveError {
-		Auth {
+	fn from(err: Option<io::Error>) -> Self {
-			description("Authentication failure"),
+		AddressResolveError(err)
-			display("Authentication failure"),
 	}
+}
 
-		#[doc = "Unrecognised protocol"]
+impl error::Error for Error {
-		BadProtocol {
+	fn source(&self) -> Option<&(error::Error + 'static)> {
-			description("Bad protocol"),
+		match self {
-			display("Bad protocol"),
+			Error::Decompression(e) => Some(e),
+			Error::Rlp(e) => Some(e),
+			_ => None,
 		}
+	}
+}
 
-		#[doc = "Expired message"]
+impl From<IoError> for Error {
-		Expired {
+	fn from(err: IoError) -> Self {
-			description("Expired message"),
+		Error::SocketIo(err)
-			display("Expired message"),
 	}
+}
 
-		#[doc = "Peer not found"]
+impl From<snappy::InvalidInput> for Error {
-		PeerNotFound {
+	fn from(err: snappy::InvalidInput) -> Self {
-			description("Peer not found"),
+		Error::Decompression(err)
-			display("Peer not found"),
 	}
+}
 
-		#[doc = "Peer is disconnected"]
+impl From<rlp::DecoderError> for Error {
-		Disconnect(reason: DisconnectReason) {
+	fn from(err: rlp::DecoderError) -> Self {
-			description("Peer disconnected"),
+		Error::Rlp(err)
-			display("Peer disconnected: {}", reason),
-		}
-
-		#[doc = "Invalid node id"]
-		InvalidNodeId {
-			description("Invalid node id"),
-			display("Invalid node id"),
-		}
-
-		#[doc = "Packet size is over the protocol limit"]
-		OversizedPacket {
-			description("Packet is too large"),
-			display("Packet is too large"),
-		}
-
-		#[doc = "Reached system resource limits for this process"]
-		ProcessTooManyFiles {
-			description("Too many open files in process."),
-			display("Too many open files in this process. Check your resource limits and restart parity"),
-		}
-
-		#[doc = "Reached system wide resource limits"]
-		SystemTooManyFiles {
-			description("Too many open files on system."),
-			display("Too many open files on system. Consider closing some processes/release some file handlers or increas the system-wide resource limits and restart parity."),
-		}
-
-		#[doc = "An unknown IO error occurred."]
-		Io(err: io::Error) {
-			description("IO Error"),
-			display("Unexpected IO error: {}", err),
-		}
 	}
 }
 
 impl From<io::Error> for Error {
 	fn from(err: io::Error) -> Self {
 		match err.raw_os_error() {
-			Some(ENFILE) => ErrorKind::ProcessTooManyFiles.into(),
+			Some(ENFILE) => Error::ProcessTooManyFiles,
-			Some(EMFILE) => ErrorKind::SystemTooManyFiles.into(),
+			Some(EMFILE) => Error::SystemTooManyFiles,
-			_ => Error::from_kind(ErrorKind::Io(err))
+			_ => Error::Io(err)
 		}
 	}
 }
 
 impl From<ethkey::Error> for Error {
 	fn from(_err: ethkey::Error) -> Self {
-		ErrorKind::Auth.into()
+		Error::Auth
 	}
 }
 
 impl From<ethkey::crypto::Error> for Error {
 	fn from(_err: ethkey::crypto::Error) -> Self {
-		ErrorKind::Auth.into()
+		Error::Auth
 	}
 }
 
 impl From<crypto::error::SymmError> for Error {
 	fn from(_err: crypto::error::SymmError) -> Self {
-		ErrorKind::Auth.into()
+		Error::Auth
 	}
 }
 
 impl From<net::AddrParseError> for Error {
-	fn from(_err: net::AddrParseError) -> Self { ErrorKind::AddressParse.into() }
+	fn from(_err: net::AddrParseError) -> Self { Error::AddressParse }
 }
 
 #[test]
@@ -208,13 +213,13 @@ fn test_errors() {
 	}
 	assert_eq!(DisconnectReason::Unknown, r);
 
-	match *<Error as From<rlp::DecoderError>>::from(rlp::DecoderError::RlpIsTooBig).kind() {
+	match <Error as From<rlp::DecoderError>>::from(rlp::DecoderError::RlpIsTooBig) {
-		ErrorKind::Rlp(_) => {},
+		Error::Rlp(_) => {},
 		_ => panic!("Unexpected error"),
 	}
 
-	match *<Error as From<ethkey::crypto::Error>>::from(ethkey::crypto::Error::InvalidMessage).kind() {
+	match <Error as From<ethkey::crypto::Error>>::from(ethkey::crypto::Error::InvalidMessage) {
-		ErrorKind::Auth => {},
+		Error::Auth => {},
 		_ => panic!("Unexpected error"),
 	}
 }
@@ -226,18 +231,18 @@ fn test_io_errors() {
 	assert_matches!(
 		<Error as From<io::Error>>::from(
 			io::Error::from_raw_os_error(ENFILE)
-			).kind(),
+			),
-		ErrorKind::ProcessTooManyFiles);
+		Error::ProcessTooManyFiles);
 
 	assert_matches!(
 		<Error as From<io::Error>>::from(
 			io::Error::from_raw_os_error(EMFILE)
-			).kind(),
+			),
-		ErrorKind::SystemTooManyFiles);
+		Error::SystemTooManyFiles);
 
 	assert_matches!(
 		<Error as From<io::Error>>::from(
 			io::Error::from_raw_os_error(0)
-			).kind(),
+			),
-		ErrorKind::Io(_));
+		Error::Io(_));
 }

util/network/src/lib.rs

@@ -32,9 +32,7 @@ extern crate serde_derive;
 
 #[cfg(test)] #[macro_use]
 extern crate assert_matches;
-
+extern crate derive_more;
-#[macro_use]
-extern crate error_chain;
 
 #[macro_use]
 extern crate lazy_static;
@@ -46,7 +44,7 @@ mod error;
 
 pub use connection_filter::{ConnectionFilter, ConnectionDirection};
 pub use io::TimerToken;
-pub use error::{Error, ErrorKind, DisconnectReason};
+pub use error::{Error, DisconnectReason};
 
 use client_version::ClientVersion;
 use std::cmp::Ordering;