mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Przemek Rzad
bfb241d7f3
* Add missing Cumulus licenses * Typo * Add missing Substrate licenses * Single job checking the sub-repos in steps * Remove dates * Remove dates * Add missing (C) * Update FRAME UI tests Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Update more UI tests Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> --------- Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
71 lines
2.9 KiB
Rust
71 lines
2.9 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd.
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// This file is part of Cumulus.
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// Cumulus is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Cumulus is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Cumulus. If not, see <http://www.gnu.org/licenses/>.
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//! Cumulus 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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//! parachain. It will be used to create the inherent data and that will be used to check the
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//! inherents inside the parachain 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 muliplying 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 parachain timestamp is reasonable.
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#![cfg_attr(not(feature = "std"), no_std)]
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use cumulus_primitives_core::relay_chain::Slot;
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use sp_inherents::{Error, InherentData};
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use sp_std::time::Duration;
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pub use sp_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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/// parachain.
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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 parachain 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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