pezkuwichain
4666047395
Updated 4763 files with dual copyright: - Parity Technologies (UK) Ltd. - Dijital Kurdistan Tech Institute
71 lines
2.9 KiB
Rust
71 lines
2.9 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd. and Dijital Kurdistan Tech Institute
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// This file is part of Pezcumulus.
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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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//! Pezcumulus timestamp related primitives.
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//!
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//! Provides a [`InherentDataProvider`] that should be used in the validation phase of the
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//! teyrchain. It will be used to create the inherent data and that will be used to check the
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//! inherents inside the teyrchain block (in this case the timestamp inherent). As we don't have
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//! access to any clock from the runtime the timestamp is always passed as an inherent into the
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//! runtime. To check this inherent when validating the block, we will use the relay chain slot. As
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//! the relay chain slot is derived from a timestamp, we can easily convert it back to a timestamp
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//! by multiplying it with the slot duration. By comparing the relay chain slot derived timestamp
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//! with the timestamp we can ensure that the teyrchain timestamp is reasonable.
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#![cfg_attr(not(feature = "std"), no_std)]
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use core::time::Duration;
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use pezcumulus_primitives_core::relay_chain::Slot;
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use pezsp_inherents::{Error, InherentData};
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pub use pezsp_timestamp::{InherentType, INHERENT_IDENTIFIER};
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/// The inherent data provider for the timestamp.
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///
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/// This should be used in the runtime when checking the inherents in the validation phase of the
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/// teyrchain.
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pub struct InherentDataProvider {
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relay_chain_slot: Slot,
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relay_chain_slot_duration: Duration,
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}
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impl InherentDataProvider {
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/// Create `Self` from the given relay chain slot and slot duration.
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pub fn from_relay_chain_slot_and_duration(
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relay_chain_slot: Slot,
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relay_chain_slot_duration: Duration,
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) -> Self {
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Self { relay_chain_slot, relay_chain_slot_duration }
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}
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/// Create the inherent data.
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pub fn create_inherent_data(&self) -> Result<InherentData, Error> {
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let mut inherent_data = InherentData::new();
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self.provide_inherent_data(&mut inherent_data).map(|_| inherent_data)
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}
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/// Provide the inherent data into the given `inherent_data`.
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pub fn provide_inherent_data(&self, inherent_data: &mut InherentData) -> Result<(), Error> {
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// As the teyrchain starts building at around `relay_chain_slot + 1` we use that slot to
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// calculate the timestamp.
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let data: InherentType = ((*self.relay_chain_slot + 1)
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* self.relay_chain_slot_duration.as_millis() as u64)
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.into();
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inherent_data.put_data(INHERENT_IDENTIFIER, &data)
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}
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}
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