mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-26 23:57:56 +00:00
Benjamin Kampmann
118 lines
3.5 KiB
Rust
118 lines
3.5 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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//! Substrate core types and inherents for timestamps.
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#![cfg_attr(not(feature = "std"), no_std)]
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use codec::Encode;
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#[cfg(feature = "std")]
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use codec::Decode;
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#[cfg(feature = "std")]
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use sp_inherents::ProvideInherentData;
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use sp_inherents::{InherentIdentifier, IsFatalError, InherentData};
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use sp_runtime::RuntimeString;
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/// The identifier for the `timestamp` inherent.
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pub const INHERENT_IDENTIFIER: InherentIdentifier = *b"timstap0";
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/// The type of the inherent.
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pub type InherentType = u64;
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/// Errors that can occur while checking the timestamp 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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/// The timestamp is valid in the future.
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/// This is a non-fatal-error and will not stop checking the inherents.
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ValidAtTimestamp(InherentType),
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/// Some other error.
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Other(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::ValidAtTimestamp(_) => false,
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InherentError::Other(_) => true,
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}
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}
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}
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impl InherentError {
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/// Try to create an instance ouf of the given identifier and data.
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#[cfg(feature = "std")]
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pub fn try_from(id: &InherentIdentifier, data: &[u8]) -> Option<Self> {
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if id == &INHERENT_IDENTIFIER {
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<InherentError as codec::Decode>::decode(&mut &data[..]).ok()
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} else {
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None
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}
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}
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}
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/// Auxiliary trait to extract timestamp inherent data.
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pub trait TimestampInherentData {
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/// Get timestamp inherent data.
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fn timestamp_inherent_data(&self) -> Result<InherentType, sp_inherents::Error>;
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}
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impl TimestampInherentData for InherentData {
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fn timestamp_inherent_data(&self) -> Result<InherentType, sp_inherents::Error> {
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self.get_data(&INHERENT_IDENTIFIER)
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.and_then(|r| r.ok_or_else(|| "Timestamp inherent data not found".into()))
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}
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}
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/// Provide duration since unix epoch in millisecond for timestamp inherent.
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#[cfg(feature = "std")]
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pub struct InherentDataProvider;
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#[cfg(feature = "std")]
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impl ProvideInherentData for InherentDataProvider {
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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<(), sp_inherents::Error> {
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use wasm_timer::SystemTime;
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let now = SystemTime::now();
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now.duration_since(SystemTime::UNIX_EPOCH)
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.map_err(|_| {
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"Current time is before unix epoch".into()
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}).and_then(|d| {
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let duration: InherentType = d.as_millis() as u64;
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inherent_data.put_data(INHERENT_IDENTIFIER, &duration)
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})
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}
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fn error_to_string(&self, error: &[u8]) -> Option<String> {
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InherentError::try_from(&INHERENT_IDENTIFIER, error).map(|e| format!("{:?}", e))
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}
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}
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/// A trait which is called when the timestamp is set.
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#[impl_trait_for_tuples::impl_for_tuples(30)]
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pub trait OnTimestampSet<Moment> {
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fn on_timestamp_set(moment: Moment);
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}
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