mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-08 07:48:00 +00:00
Benjamin Kampmann
78 lines
2.3 KiB
Rust
78 lines
2.3 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2019-2020 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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//! FRAME module that tracks the last finalized block, as perceived by block authors.
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#![cfg_attr(not(feature = "std"), no_std)]
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use sp_inherents::{InherentIdentifier, InherentData, Error};
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use codec::Decode;
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#[cfg(feature = "std")]
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use codec::Encode;
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/// The identifier for the `finalnum` inherent.
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pub const INHERENT_IDENTIFIER: InherentIdentifier = *b"finalnum";
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/// Auxiliary trait to extract finalized inherent data.
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pub trait FinalizedInherentData<N: Decode> {
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/// Get finalized inherent data.
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fn finalized_number(&self) -> Result<N, Error>;
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}
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impl<N: Decode> FinalizedInherentData<N> for InherentData {
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fn finalized_number(&self) -> Result<N, Error> {
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self.get_data(&INHERENT_IDENTIFIER)
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.and_then(|r| r.ok_or_else(|| "Finalized number inherent data not found".into()))
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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<F, N> {
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inner: F,
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_marker: std::marker::PhantomData<N>,
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}
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#[cfg(feature = "std")]
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impl<F, N> InherentDataProvider<F, N> {
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pub fn new(final_oracle: F) -> Self {
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InherentDataProvider { inner: final_oracle, _marker: Default::default() }
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}
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}
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#[cfg(feature = "std")]
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impl<F, N: Encode> sp_inherents::ProvideInherentData for InherentDataProvider<F, N>
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where F: Fn() -> Result<N, Error>
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{
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fn inherent_identifier(&self) -> &'static InherentIdentifier {
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&INHERENT_IDENTIFIER
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}
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fn provide_inherent_data(
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&self,
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inherent_data: &mut InherentData,
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) -> Result<(), Error> {
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(self.inner)()
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.and_then(|n| inherent_data.put_data(INHERENT_IDENTIFIER, &n))
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}
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fn error_to_string(&self, _error: &[u8]) -> Option<String> {
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Some(format!("no further information"))
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}
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}
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