mod.rs

// Copyright 2017-2020 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.

//! `V1` Primitives.

use bitvec::vec::BitVec;
use parity_scale_codec::{Decode, Encode};
use scale_info::TypeInfo;
use sp_std::prelude::*;

use application_crypto::KeyTypeId;
use inherents::InherentIdentifier;
use primitives::RuntimeDebug;
use runtime_primitives::traits::{AppVerify, Header as HeaderT};
use sp_arithmetic::traits::{BaseArithmetic, Saturating};

pub use runtime_primitives::traits::{BlakeTwo256, Hash as HashT};

// Export some core primitives.
pub use polkadot_core_primitives::v2::{
	AccountId, AccountIndex, AccountPublic, Balance, Block, BlockId, BlockNumber, CandidateHash,
	ChainId, DownwardMessage, Hash, Header, InboundDownwardMessage, InboundHrmpMessage, Moment,
	Nonce, OutboundHrmpMessage, Remark, Signature, UncheckedExtrinsic,
};

// Export some polkadot-parachain primitives
pub use polkadot_parachain::primitives::{
	HeadData, HrmpChannelId, Id, UpwardMessage, ValidationCode, ValidationCodeHash,
	LOWEST_PUBLIC_ID, LOWEST_USER_ID,
};

#[cfg(feature = "std")]
use parity_util_mem::{MallocSizeOf, MallocSizeOfOps};
#[cfg(feature = "std")]
use serde::{Deserialize, Serialize};

pub use sp_authority_discovery::AuthorityId as AuthorityDiscoveryId;
pub use sp_consensus_slots::Slot;
pub use sp_staking::SessionIndex;

/// Signed data.
mod signed;
pub use signed::{EncodeAs, Signed, UncheckedSigned};

mod metrics;
pub use metrics::{
	metric_definitions, RuntimeMetricLabel, RuntimeMetricLabelValue, RuntimeMetricLabelValues,
	RuntimeMetricLabels, RuntimeMetricOp, RuntimeMetricUpdate,
};

/// The key type ID for a collator key.
pub const COLLATOR_KEY_TYPE_ID: KeyTypeId = KeyTypeId(*b"coll");

mod collator_app {
	use application_crypto::{app_crypto, sr25519};
	app_crypto!(sr25519, super::COLLATOR_KEY_TYPE_ID);
}

/// Identity that collators use.
pub type CollatorId = collator_app::Public;

#[cfg(feature = "std")]
impl MallocSizeOf for CollatorId {
	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		0
	}
	fn constant_size() -> Option<usize> {
		Some(0)
	}
}

/// A Parachain collator keypair.
#[cfg(feature = "std")]
pub type CollatorPair = collator_app::Pair;

/// Signature on candidate's block data by a collator.
pub type CollatorSignature = collator_app::Signature;

#[cfg(feature = "std")]
impl MallocSizeOf for CollatorSignature {
	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		0
	}
	fn constant_size() -> Option<usize> {
		Some(0)
	}
}

/// The key type ID for a parachain validator key.
pub const PARACHAIN_KEY_TYPE_ID: KeyTypeId = KeyTypeId(*b"para");

mod validator_app {
	use application_crypto::{app_crypto, sr25519};
	app_crypto!(sr25519, super::PARACHAIN_KEY_TYPE_ID);
}

/// Identity that parachain validators use when signing validation messages.
///
/// For now we assert that parachain validator set is exactly equivalent to the authority set, and
/// so we define it to be the same type as `SessionKey`. In the future it may have different crypto.
pub type ValidatorId = validator_app::Public;

#[cfg(feature = "std")]
impl MallocSizeOf for ValidatorId {
	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		0
	}
	fn constant_size() -> Option<usize> {
		Some(0)
	}
}

/// Index of the validator is used as a lightweight replacement of the `ValidatorId` when appropriate.
#[derive(Eq, Ord, PartialEq, PartialOrd, Copy, Clone, Encode, Decode, TypeInfo, RuntimeDebug)]
#[cfg_attr(feature = "std", derive(Serialize, Deserialize, Hash, MallocSizeOf))]
pub struct ValidatorIndex(pub u32);

// We should really get https://github.com/paritytech/polkadot/issues/2403 going ..
impl From<u32> for ValidatorIndex {
	fn from(n: u32) -> Self {
		ValidatorIndex(n)
	}
}

application_crypto::with_pair! {
	/// A Parachain validator keypair.
	pub type ValidatorPair = validator_app::Pair;
}

/// Signature with which parachain validators sign blocks.
///
/// For now we assert that parachain validator set is exactly equivalent to the authority set, and
/// so we define it to be the same type as `SessionKey`. In the future it may have different crypto.
pub type ValidatorSignature = validator_app::Signature;

#[cfg(feature = "std")]
impl MallocSizeOf for ValidatorSignature {
	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		0
	}
	fn constant_size() -> Option<usize> {
		Some(0)
	}
}

/// A declarations of storage keys where an external observer can find some interesting data.
pub mod well_known_keys {
	use super::{HrmpChannelId, Id};
	use hex_literal::hex;
	use parity_scale_codec::Encode as _;
	use sp_io::hashing::twox_64;
	use sp_std::prelude::*;

	// A note on generating these magic values below:
	//
	// The `StorageValue`, such as `ACTIVE_CONFIG` was obtained by calling:
	//
	//     <Self as Store>::ActiveConfig::hashed_key()
	//
	// The `StorageMap` values require `prefix`, and for example for `hrmp_egress_channel_index`,
	// it could be obtained like:
	//
	//     <Hrmp as Store>::HrmpEgressChannelsIndex::prefix_hash();
	//

	/// The current epoch index.
	///
	/// The storage item should be access as a `u64` encoded value.
	pub const EPOCH_INDEX: &[u8] =
		&hex!["1cb6f36e027abb2091cfb5110ab5087f38316cbf8fa0da822a20ac1c55bf1be3"];

	/// The current relay chain block randomness
	///
	/// The storage item should be accessed as a `schnorrkel::Randomness` encoded value.
	pub const CURRENT_BLOCK_RANDOMNESS: &[u8] =
		&hex!["1cb6f36e027abb2091cfb5110ab5087fd077dfdb8adb10f78f10a5df8742c545"];

	/// The randomness for one epoch ago
	///
	/// The storage item should be accessed as a `schnorrkel::Randomness` encoded value.
	pub const ONE_EPOCH_AGO_RANDOMNESS: &[u8] =
		&hex!["1cb6f36e027abb2091cfb5110ab5087f7ce678799d3eff024253b90e84927cc6"];

	/// The randomness for two epochs ago
	///
	/// The storage item should be accessed as a `schnorrkel::Randomness` encoded value.
	pub const TWO_EPOCHS_AGO_RANDOMNESS: &[u8] =