Tweak Rococo Settings For Onboarding Testing (#2671)

* Tweak Rococo Settings

* rococo: use CurrentBlockRandomness wrapper in auctions

Co-authored-by: André Silva <andrerfosilva@gmail.com>
Co-authored-by: Bastian Köcher <info@kchr.de>

runtime/rococo/src/constants.rs

@@ -34,7 +34,7 @@ pub mod time {
 	pub const MILLISECS_PER_BLOCK: Moment = 6000;
 	pub const SLOT_DURATION: Moment = MILLISECS_PER_BLOCK;
 	frame_support::parameter_types! {
-		pub storage EpochDurationInBlocks: BlockNumber = 1 * HOURS;
+		pub storage EpochDurationInBlocks: BlockNumber = 30 * MINUTES;
 	}
 
 	// These time units are defined in number of blocks.

runtime/rococo/src/lib.rs

@@ -616,11 +616,29 @@ parameter_types! {
 	pub const EndingPeriod: BlockNumber = 15 * MINUTES;
 }
 
+// A wrapper around `babe::CurrentBlockRandomness` that does not return `Option<Random>`.
+pub struct CurrentBlockRandomness;
+
+impl Randomness<Hash, BlockNumber> for CurrentBlockRandomness {
+	fn random(subject: &[u8]) -> (Hash, BlockNumber) {
+		let (randomness, block_number) =
+			pallet_babe::CurrentBlockRandomness::<Runtime>::random(subject);
+
+		let randomness = randomness.expect(
+			"only returns None when secondary VRF slots are not enabled; \
+			 secondary VRF slots are enbaled for rococo runtime; \
+			 qed.",
+		);
+
+		(randomness, block_number)
+	}
+}
+
 impl auctions::Config for Runtime {
 	type Event = Event;
 	type Leaser = Slots;
 	type EndingPeriod = EndingPeriod;
-	type Randomness = pallet_babe::RandomnessFromOneEpochAgo<Runtime>;
+	type Randomness = CurrentBlockRandomness;
 	type InitiateOrigin = EnsureRoot<AccountId>;
 	type WeightInfo = auctions::TestWeightInfo;
 }