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// Copyright 2019-2020 Parity Technologies (UK) Ltd.
// This file is part of Parity Bridges Common.
// Parity Bridges Common 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.
// Parity Bridges Common 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 Parity Bridges Common. If not, see <http://www.gnu.org/licenses/>.
use frame_support::Parameter;
use num_traits::AsPrimitive;
use sp_runtime::traits::{
AtLeast32BitUnsigned, Hash as HashT, Header as HeaderT, MaybeDisplay, MaybeMallocSizeOf, MaybeSerializeDeserialize,
Member, SimpleBitOps,
};
use sp_std::str::FromStr;
/// Minimal Substrate-based chain representation that may be used from no_std environment.
pub trait Chain {
/// A type that fulfills the abstract idea of what a Substrate block number is.
// Constraits come from the associated Number type of `sp_runtime::traits::Header`
// See here for more info:
// https://crates.parity.io/sp_runtime/traits/trait.Header.html#associatedtype.Number
//
// Note that the `AsPrimitive<usize>` trait is required by the Grandpa justification
// verifier, and is not usually part of a Substrate Header's Number type.
type BlockNumber: Parameter
+ Member
+ MaybeSerializeDeserialize
+ sp_std::hash::Hash
+ Copy
+ MaybeDisplay
+ AtLeast32BitUnsigned
+ FromStr
+ MaybeMallocSizeOf
+ AsPrimitive<usize>;
/// A type that fulfills the abstract idea of what a Substrate hash is.
// Constraits come from the associated Hash type of `sp_runtime::traits::Header`
// See here for more info:
// https://crates.parity.io/sp_runtime/traits/trait.Header.html#associatedtype.Hash
type Hash: Parameter
+ Member
+ MaybeSerializeDeserialize
+ sp_std::hash::Hash
+ Ord
+ Copy
+ MaybeDisplay
+ Default
+ SimpleBitOps
+ AsRef<[u8]>
+ AsMut<[u8]>
+ MaybeMallocSizeOf;
/// A type that fulfills the abstract idea of what a Substrate hasher (a type
/// that produces hashes) is.
// Constraits come from the associated Hashing type of `sp_runtime::traits::Header`
// See here for more info:
// https://crates.parity.io/sp_runtime/traits/trait.Header.html#associatedtype.Hashing
type Hasher: HashT<Output = Self::Hash>;
/// A type that fulfills the abstract idea of what a Substrate header is.
// See here for more info:
// https://crates.parity.io/sp_runtime/traits/trait.Header.html
type Header: Parameter + HeaderT<Number = Self::BlockNumber, Hash = Self::Hash>;
}
/// Block number used by the chain.
pub type BlockNumberOf<C> = <C as Chain>::BlockNumber;
/// Hash type used by the chain.
pub type HashOf<C> = <C as Chain>::Hash;
/// Hasher type used by the chain.
pub type HasherOf<C> = <C as Chain>::Header;
/// Header type used by the chain.
pub type HeaderOf<C> = <C as Chain>::Header;