Associated type Hasher for QueryPreimage, StorePreimage and Bounded (#1720)

I hope it's enough to fix #1701 
the only solution I found to make it happen is to put an associated type
to the `Bounded` enum as well.
@liamaharon @kianenigma @bkchr 

Polkadot address: 12poSUQPtcF1HUPQGY3zZu2P8emuW9YnsPduA4XG3oCEfJVp

---------

Signed-off-by: muraca <mmuraca247@gmail.com>
Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

substrate/frame/democracy/src/benchmarking.rs

@@ -25,7 +25,6 @@ use frame_support::{
 	traits::{Currency, EnsureOrigin, Get, OnInitialize, UnfilteredDispatchable},
 };
 use frame_system::{pallet_prelude::BlockNumberFor, RawOrigin};
-use sp_core::H256;
 use sp_runtime::{traits::Bounded, BoundedVec};
 
 use crate::Pallet as Democracy;
@@ -46,7 +45,7 @@ fn make_proposal<T: Config>(n: u32) -> BoundedCallOf<T> {
 	<T as Config>::Preimages::bound(call).unwrap()
 }
 
-fn add_proposal<T: Config>(n: u32) -> Result<H256, &'static str> {
+fn add_proposal<T: Config>(n: u32) -> Result<T::Hash, &'static str> {
 	let other = funded_account::<T>("proposer", n);
 	let value = T::MinimumDeposit::get();
 	let proposal = make_proposal::<T>(n);
@@ -55,7 +54,7 @@ fn add_proposal<T: Config>(n: u32) -> Result<H256, &'static str> {
 }
 
 // add a referendum with a metadata.
-fn add_referendum<T: Config>(n: u32) -> (ReferendumIndex, H256, PreimageHash) {
+fn add_referendum<T: Config>(n: u32) -> (ReferendumIndex, T::Hash, T::Hash) {
 	let vote_threshold = VoteThreshold::SimpleMajority;
 	let proposal = make_proposal::<T>(n);
 	let hash = proposal.hash();
@@ -85,7 +84,7 @@ fn assert_has_event<T: Config>(generic_event: <T as Config>::RuntimeEvent) {
 }
 
 // note a new preimage.
-fn note_preimage<T: Config>() -> PreimageHash {
+fn note_preimage<T: Config>() -> T::Hash {
 	use core::sync::atomic::{AtomicU8, Ordering};
 	use sp_std::borrow::Cow;
 	// note a new preimage on every function invoke.

substrate/frame/democracy/src/lib.rs

@@ -159,9 +159,8 @@ use frame_support::{
 	traits::{
 		defensive_prelude::*,
 		schedule::{v3::Named as ScheduleNamed, DispatchTime},
-		Bounded, Currency, EnsureOrigin, Get, Hash as PreimageHash, LockIdentifier,
-		LockableCurrency, OnUnbalanced, QueryPreimage, ReservableCurrency, StorePreimage,
-		WithdrawReasons,
+		Bounded, Currency, EnsureOrigin, Get, LockIdentifier, LockableCurrency, OnUnbalanced,
+		QueryPreimage, ReservableCurrency, StorePreimage, WithdrawReasons,
 	},
 	weights::Weight,
 };
@@ -203,7 +202,7 @@ type NegativeImbalanceOf<T> = <<T as Config>::Currency as Currency<
 	<T as frame_system::Config>::AccountId,
 >>::NegativeImbalance;
 pub type CallOf<T> = <T as frame_system::Config>::RuntimeCall;
-pub type BoundedCallOf<T> = Bounded<CallOf<T>>;
+pub type BoundedCallOf<T> = Bounded<CallOf<T>, <T as frame_system::Config>::Hashing>;
 type AccountIdLookupOf<T> = <<T as frame_system::Config>::Lookup as StaticLookup>::Source;
 
 #[frame_support::pallet]
@@ -211,7 +210,6 @@ pub mod pallet {
 	use super::{DispatchResult, *};
 	use frame_support::pallet_prelude::*;
 	use frame_system::pallet_prelude::*;
-	use sp_core::H256;
 
 	/// The current storage version.
 	const STORAGE_VERSION: StorageVersion = StorageVersion::new(1);
@@ -226,10 +224,15 @@ pub mod pallet {
 		type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
 
 		/// The Scheduler.
-		type Scheduler: ScheduleNamed<BlockNumberFor<Self>, CallOf<Self>, Self::PalletsOrigin>;
+		type Scheduler: ScheduleNamed<
+			BlockNumberFor<Self>,
+			CallOf<Self>,
+			Self::PalletsOrigin,
+			Hasher = Self::Hashing,
+		>;
 
 		/// The Preimage provider.
-		type Preimages: QueryPreimage + StorePreimage;
+		type Preimages: QueryPreimage<H = Self::Hashing> + StorePreimage;
 
 		/// Currency type for this pallet.
 		type Currency: ReservableCurrency<Self::AccountId>
@@ -421,22 +424,22 @@ pub mod pallet {
 	pub type Blacklist<T: Config> = StorageMap<
 		_,
 		Identity,
-		H256,
+		T::Hash,
 		(BlockNumberFor<T>, BoundedVec<T::AccountId, T::MaxBlacklisted>),
 	>;
 
 	/// Record of all proposals that have been subject to emergency cancellation.
 	#[pallet::storage]
-	pub type Cancellations<T: Config> = StorageMap<_, Identity, H256, bool, ValueQuery>;
+	pub type Cancellations<T: Config> = StorageMap<_, Identity, T::Hash, bool, ValueQuery>;
 
 	/// General information concerning any proposal or referendum.
-	/// The `PreimageHash` refers to the preimage of the `Preimages` provider which can be a JSON
+	/// The `Hash` refers to the preimage of the `Preimages` provider which can be a JSON
 	/// dump or IPFS hash of a JSON file.
 	///
 	/// Consider a garbage collection for a metadata of finished referendums to `unrequest` (remove)
 	/// large preimages.
 	#[pallet::storage]
-	pub type MetadataOf<T: Config> = StorageMap<_, Blake2_128Concat, MetadataOwner, PreimageHash>;
+	pub type MetadataOf<T: Config> = StorageMap<_, Blake2_128Concat, MetadataOwner, T::Hash>;
 
 	#[pallet::genesis_config]
 	#[derive(frame_support::DefaultNoBound)]
@@ -476,9 +479,9 @@ pub mod pallet {
 		/// An account has cancelled a previous delegation operation.
 		Undelegated { account: T::AccountId },
 		/// An external proposal has been vetoed.
-		Vetoed { who: T::AccountId, proposal_hash: H256, until: BlockNumberFor<T> },
+		Vetoed { who: T::AccountId, proposal_hash: T::Hash, until: BlockNumberFor<T> },
 		/// A proposal_hash has been blacklisted permanently.
-		Blacklisted { proposal_hash: H256 },
+		Blacklisted { proposal_hash: T::Hash },
 		/// An account has voted in a referendum
 		Voted { voter: T::AccountId, ref_index: ReferendumIndex, vote: AccountVote<BalanceOf<T>> },
 		/// An account has secconded a proposal
@@ -490,14 +493,14 @@ pub mod pallet {
 			/// Metadata owner.
 			owner: MetadataOwner,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 		/// Metadata for a proposal or a referendum has been cleared.
 		MetadataCleared {
 			/// Metadata owner.
 			owner: MetadataOwner,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 		/// Metadata has been transferred to new owner.
 		MetadataTransferred {
@@ -506,7 +509,7 @@ pub mod pallet {
 			/// New metadata owner.
 			owner: MetadataOwner,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 	}
 
@@ -775,7 +778,7 @@ pub mod pallet {
 		#[pallet::weight(T::WeightInfo::fast_track())]
 		pub fn fast_track(
 			origin: OriginFor<T>,
-			proposal_hash: H256,
+			proposal_hash: T::Hash,
 			voting_period: BlockNumberFor<T>,
 			delay: BlockNumberFor<T>,
 		) -> DispatchResult {
@@ -827,7 +830,7 @@ pub mod pallet {
 		/// Weight: `O(V + log(V))` where V is number of `existing vetoers`
 		#[pallet::call_index(8)]
 		#[pallet::weight(T::WeightInfo::veto_external())]
-		pub fn veto_external(origin: OriginFor<T>, proposal_hash: H256) -> DispatchResult {
+		pub fn veto_external(origin: OriginFor<T>, proposal_hash: T::Hash) -> DispatchResult {
 			let who = T::VetoOrigin::ensure_origin(origin)?;
 
 			if let Some((ext_proposal, _)) = NextExternal::<T>::get() {
@@ -1042,7 +1045,7 @@ pub mod pallet {
 		#[pallet::weight((T::WeightInfo::blacklist(), DispatchClass::Operational))]
 		pub fn blacklist(
 			origin: OriginFor<T>,
-			proposal_hash: H256,
+			proposal_hash: T::Hash,
 			maybe_ref_index: Option<ReferendumIndex>,
 		) -> DispatchResult {
 			T::BlacklistOrigin::ensure_origin(origin)?;
@@ -1139,7 +1142,7 @@ pub mod pallet {
 		pub fn set_metadata(
 			origin: OriginFor<T>,
 			owner: MetadataOwner,
-			maybe_hash: Option<PreimageHash>,
+			maybe_hash: Option<T::Hash>,
 		) -> DispatchResult {
 			match owner {
 				MetadataOwner::External => {
@@ -1173,15 +1176,16 @@ pub mod pallet {
 }
 
 pub trait EncodeInto: Encode {
-	fn encode_into<T: AsMut<[u8]> + Default>(&self) -> T {
+	fn encode_into<T: AsMut<[u8]> + Default, H: sp_core::Hasher>(&self) -> T {
 		let mut t = T::default();
 		self.using_encoded(|data| {
 			if data.len() <= t.as_mut().len() {
 				t.as_mut()[0..data.len()].copy_from_slice(data);
 			} else {
-				// encoded self is too big to fit into a T. hash it and use the first bytes of that
-				// instead.
-				let hash = sp_io::hashing::blake2_256(data);
+				// encoded self is too big to fit into a T.
+				// hash it and use the first bytes of that instead.
+				let hash = H::hash(&data);
+				let hash = hash.as_ref();
 				let l = t.as_mut().len().min(hash.len());
 				t.as_mut()[0..l].copy_from_slice(&hash[0..l]);
 			}
@@ -1610,7 +1614,7 @@ impl<T: Config> Pallet<T> {
 			// Earliest it can be scheduled for is next block.
 			let when = now.saturating_add(status.delay.max(One::one()));
 			if T::Scheduler::schedule_named(
-				(DEMOCRACY_ID, index).encode_into(),
+				(DEMOCRACY_ID, index).encode_into::<_, T::Hashing>(),
 				DispatchTime::At(when),
 				None,
 				63,

substrate/frame/democracy/src/tests.rs

@@ -277,7 +277,7 @@ fn tally(r: ReferendumIndex) -> Tally<u64> {
 }
 
 /// note a new preimage without registering.
-fn note_preimage(who: u64) -> PreimageHash {
+fn note_preimage(who: u64) -> <Test as frame_system::Config>::Hash {
 	use std::sync::atomic::{AtomicU8, Ordering};
 	// note a new preimage on every function invoke.
 	static COUNTER: AtomicU8 = AtomicU8::new(0);

substrate/frame/democracy/src/tests/metadata.rs

@@ -22,9 +22,8 @@ use super::*;
 #[test]
 fn set_external_metadata_works() {
 	new_test_ext().execute_with(|| {
-		use frame_support::traits::Hash as PreimageHash;
 		// invalid preimage hash.
-		let invalid_hash: PreimageHash = [1u8; 32].into();
+		let invalid_hash: <Test as frame_system::Config>::Hash = [1u8; 32].into();
 		// metadata owner is an external proposal.
 		let owner = MetadataOwner::External;
 		// fails to set metadata if an external proposal does not exist.
@@ -83,9 +82,8 @@ fn clear_metadata_works() {
 #[test]
 fn set_proposal_metadata_works() {
 	new_test_ext().execute_with(|| {
-		use frame_support::traits::Hash as PreimageHash;
 		// invalid preimage hash.
-		let invalid_hash: PreimageHash = [1u8; 32].into();
+		let invalid_hash: <Test as frame_system::Config>::Hash = [1u8; 32].into();
 		// create an external proposal.
 		assert_ok!(propose_set_balance(1, 2, 5));
 		// metadata owner is a public proposal.