Move grandpa crates to consensus folder (#13458)

* Move grandpa under consensus dir
* Rename grandpa folder
* Finish grandpa renaming
* Minor tweaks
* Cargo fmt
* Adjust path to chain spec

substrate/client/consensus/grandpa/rpc/src/error.rs

@@ -0,0 +1,80 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program 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.
+
+// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+use jsonrpsee::{
+	core::Error as JsonRpseeError,
+	types::error::{CallError, ErrorObject},
+};
+
+#[derive(Debug, thiserror::Error)]
+/// Top-level error type for the RPC handler
+pub enum Error {
+	/// The GRANDPA RPC endpoint is not ready.
+	#[error("GRANDPA RPC endpoint not ready")]
+	EndpointNotReady,
+	/// GRANDPA reports the authority set id to be larger than 32-bits.
+	#[error("GRANDPA reports authority set id unreasonably large")]
+	AuthoritySetIdReportedAsUnreasonablyLarge,
+	/// GRANDPA reports voter state with round id or weights larger than 32-bits.
+	#[error("GRANDPA reports voter state as unreasonably large")]
+	VoterStateReportsUnreasonablyLargeNumbers,
+	/// GRANDPA prove finality failed.
+	#[error("GRANDPA prove finality rpc failed: {0}")]
+	ProveFinalityFailed(#[from] sc_consensus_grandpa::FinalityProofError),
+}
+
+/// The error codes returned by jsonrpc.
+pub enum ErrorCode {
+	/// Returned when Grandpa RPC endpoint is not ready.
+	NotReady = 1,
+	/// Authority set ID is larger than 32-bits.
+	AuthoritySetTooLarge,
+	/// Voter state with round id or weights larger than 32-bits.
+	VoterStateTooLarge,
+	/// Failed to prove finality.
+	ProveFinality,
+}
+
+impl From<Error> for ErrorCode {
+	fn from(error: Error) -> Self {
+		match error {
+			Error::EndpointNotReady => ErrorCode::NotReady,
+			Error::AuthoritySetIdReportedAsUnreasonablyLarge => ErrorCode::AuthoritySetTooLarge,
+			Error::VoterStateReportsUnreasonablyLargeNumbers => ErrorCode::VoterStateTooLarge,
+			Error::ProveFinalityFailed(_) => ErrorCode::ProveFinality,
+		}
+	}
+}
+
+impl From<Error> for JsonRpseeError {
+	fn from(error: Error) -> Self {
+		let message = error.to_string();
+		let code = ErrorCode::from(error);
+		JsonRpseeError::Call(CallError::Custom(ErrorObject::owned(
+			code as i32,
+			message,
+			None::<()>,
+		)))
+	}
+}
+
+impl From<std::num::TryFromIntError> for Error {
+	fn from(_error: std::num::TryFromIntError) -> Self {
+		Error::VoterStateReportsUnreasonablyLargeNumbers
+	}
+}