Companion PR for substrate PR 8072 - Add a config field to babe epochs (#2467)

* Add a config field to babe epochs

* Fix test

* Add BABE_GENESIS_EPOCH_CONFIG consts

* Use PrimaryAndSecondaryVRFSlots and remove newlines

* Make epoch_configs Some

* Fix tests

* Fix test service tests

* Add a BabeEpochConfigMigrations OnRuntimeUpgrade

* Apply suggestions

* Use PrimaryAndSecondaryPlainSlots in kusama

* Remove migration from test runtime and rococo

* Add HasPalletPrefix

* Rename to BabePalletPrefix and change BabeApi -> Babe

* "Update Substrate"

* Update substrate

* Resolve parantheses errors

Co-authored-by: parity-processbot <>

polkadot/runtime/test-runtime/src/lib.rs

@@ -100,6 +100,13 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	transaction_version: 1,
 };
 
+/// The BABE epoch configuration at genesis.
+pub const BABE_GENESIS_EPOCH_CONFIG: babe_primitives::BabeEpochConfiguration =
+	babe_primitives::BabeEpochConfiguration {
+		c: PRIMARY_PROBABILITY,
+		allowed_slots: babe_primitives::AllowedSlots::PrimaryAndSecondaryVRFSlots
+	};
+
 /// Native version.
 #[cfg(any(feature = "std", test))]
 pub fn native_version() -> NativeVersion {
@@ -737,10 +744,10 @@ sp_api::impl_runtime_apis! {
 			babe_primitives::BabeGenesisConfiguration {
 				slot_duration: Babe::slot_duration(),
 				epoch_length: EpochDuration::get(),
-				c: PRIMARY_PROBABILITY,
+				c: BABE_GENESIS_EPOCH_CONFIG.c,
 				genesis_authorities: Babe::authorities(),
 				randomness: Babe::randomness(),
-				allowed_slots: babe_primitives::AllowedSlots::PrimaryAndSecondaryVRFSlots,
+				allowed_slots: BABE_GENESIS_EPOCH_CONFIG.allowed_slots,
 			}
 		}