mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Squirrel
102 lines
2.8 KiB
Rust
102 lines
2.8 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2019-2021 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Authorship Primitives
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#![cfg_attr(not(feature = "std"), no_std)]
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use sp_std::{prelude::*, result::Result};
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#[cfg(feature = "std")]
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use codec::Decode;
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use codec::Encode;
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use sp_inherents::{Error, InherentData, InherentIdentifier, IsFatalError};
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use sp_runtime::{traits::Header as HeaderT, RuntimeString};
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/// The identifier for the `uncles` inherent.
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pub const INHERENT_IDENTIFIER: InherentIdentifier = *b"uncles00";
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/// Errors that can occur while checking the authorship inherent.
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#[derive(Encode, sp_runtime::RuntimeDebug)]
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#[cfg_attr(feature = "std", derive(Decode))]
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pub enum InherentError {
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Uncles(RuntimeString),
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}
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impl IsFatalError for InherentError {
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fn is_fatal_error(&self) -> bool {
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match self {
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InherentError::Uncles(_) => true,
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}
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}
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}
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/// Auxiliary trait to extract uncles inherent data.
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pub trait UnclesInherentData<H> {
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/// Get uncles.
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fn uncles(&self) -> Result<Vec<H>, Error>;
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}
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impl<H: HeaderT> UnclesInherentData<H> for InherentData {
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fn uncles(&self) -> Result<Vec<H>, Error> {
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Ok(self.get_data(&INHERENT_IDENTIFIER)?.unwrap_or_default())
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}
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}
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/// Provider for inherent data.
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#[cfg(feature = "std")]
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pub struct InherentDataProvider<H> {
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uncles: Vec<H>,
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}
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#[cfg(feature = "std")]
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impl<H> InherentDataProvider<H> {
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/// Create a new inherent data provider with the given `uncles`.
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pub fn new(uncles: Vec<H>) -> Self {
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InherentDataProvider { uncles }
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}
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/// Create a new instance that is usable for checking inherents.
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///
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/// This will always return an empty vec of uncles.
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pub fn check_inherents() -> Self {
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Self { uncles: Vec::new() }
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}
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}
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#[cfg(feature = "std")]
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#[async_trait::async_trait]
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impl<H: HeaderT> sp_inherents::InherentDataProvider for InherentDataProvider<H> {
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fn provide_inherent_data(&self, inherent_data: &mut InherentData) -> Result<(), Error> {
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inherent_data.put_data(INHERENT_IDENTIFIER, &self.uncles)
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}
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async fn try_handle_error(
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&self,
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identifier: &InherentIdentifier,
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error: &[u8],
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) -> Option<Result<(), Error>> {
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if *identifier != INHERENT_IDENTIFIER {
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return None
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}
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let error = InherentError::decode(&mut &error[..]).ok()?;
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Some(Err(Error::Application(Box::from(format!("{:?}", error)))))
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}
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}
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