Expose tracks as a constant. (paritytech#12273)

* Expose tracks as a constant.

* Formatting

Author: gavofyork

bin/node/runtime/src/lib.rs

@@ -828,6 +828,7 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
 		}
 	}
 }
+pallet_referenda::impl_tracksinfo_get!(TracksInfo, Balance, BlockNumber);
 
 impl pallet_referenda::Config for Runtime {
 	type WeightInfo = pallet_referenda::weights::SubstrateWeight<Self>;

frame/referenda/src/lib.rs

@@ -72,7 +72,7 @@ use frame_support::{
 			v2::{Anon as ScheduleAnon, Named as ScheduleNamed},
 			DispatchTime, MaybeHashed,
 		},
-		Currency, Get, LockIdentifier, OnUnbalanced, OriginTrait, PollStatus, Polling,
+		Currency, LockIdentifier, OnUnbalanced, OriginTrait, PollStatus, Polling,
 		ReservableCurrency, VoteTally,
 	},
 	BoundedVec,
@@ -108,6 +108,30 @@ mod tests;
 #[cfg(feature = "runtime-benchmarks")]
 pub mod benchmarking;
 
+pub use frame_support::traits::Get;
+pub use sp_std::vec::Vec;
+
+#[macro_export]
+macro_rules! impl_tracksinfo_get {
+	($tracksinfo:ty, $balance:ty, $blocknumber:ty) => {
+		impl
+			$crate::Get<
+				$crate::Vec<(
+					<$tracksinfo as $crate::TracksInfo<$balance, $blocknumber>>::Id,
+					$crate::TrackInfo<$balance, $blocknumber>,
+				)>,
+			> for $tracksinfo
+		{
+			fn get() -> $crate::Vec<(
+				<$tracksinfo as $crate::TracksInfo<$balance, $blocknumber>>::Id,
+				$crate::TrackInfo<$balance, $blocknumber>,
+			)> {
+				<$tracksinfo as $crate::TracksInfo<$balance, $blocknumber>>::tracks().to_vec()
+			}
+		}
+	};
+}
+
 const ASSEMBLY_ID: LockIdentifier = *b"assembly";
 
 #[frame_support::pallet]
@@ -184,11 +208,17 @@ pub mod pallet {
 
 		// The other stuff.
 		/// Information concerning the different referendum tracks.
-		type Tracks: TracksInfo<
-			BalanceOf<Self, I>,
-			Self::BlockNumber,
-			Origin = <Self::Origin as OriginTrait>::PalletsOrigin,
-		>;
+		#[pallet::constant]
+		type Tracks: Get<
+				Vec<(
+					<Self::Tracks as TracksInfo<BalanceOf<Self, I>, Self::BlockNumber>>::Id,
+					TrackInfo<BalanceOf<Self, I>, Self::BlockNumber>,
+				)>,
+			> + TracksInfo<
+				BalanceOf<Self, I>,
+				Self::BlockNumber,
+				Origin = <Self::Origin as OriginTrait>::PalletsOrigin,
+			>;
 	}
 
 	/// The next free referendum index, aka the number of referenda started so far.

frame/referenda/src/mock.rs

@@ -210,6 +210,7 @@ impl TracksInfo<u64, u64> for TestTracksInfo {
 		}
 	}
 }
+impl_tracksinfo_get!(TestTracksInfo, u64, u64);
 
 impl Config for Test {
 	type WeightInfo = ();