EPM and staking events improvement (paritytech#13035)

* EPM and staking events improvement

* Uses RawOrigin in ElectionCompute event

* Refactors new phase events to PhaseTransition event

* PhaseTransitioned and remove RawOrigin from event

* Adds helpers for epm phase transition and staking force new

* addresses review comments

* nit: removes unecessary clone

* fixes benchmarks

Co-authored-by: parity-processbot <>

frame/election-provider-multi-phase/src/benchmarking.rs

@@ -200,7 +200,7 @@ frame_benchmarking::benchmarks! {
 		assert!(<MultiPhase<T>>::snapshot().is_none());
 		assert!(<MultiPhase<T>>::current_phase().is_off());
 	}: {
-		<MultiPhase<T>>::on_initialize_open_signed();
+		<MultiPhase<T>>::phase_transition(Phase::Signed);
 	} verify {
 		assert!(<MultiPhase<T>>::snapshot().is_none());
 		assert!(<MultiPhase<T>>::current_phase().is_signed());
@@ -210,7 +210,8 @@ frame_benchmarking::benchmarks! {
 		assert!(<MultiPhase<T>>::snapshot().is_none());
 		assert!(<MultiPhase<T>>::current_phase().is_off());
 	}: {
-		<MultiPhase<T>>::on_initialize_open_unsigned(true, 1u32.into())
+		let now = frame_system::Pallet::<T>::block_number();
+		<MultiPhase<T>>::phase_transition(Phase::Unsigned((true, now)));
 	} verify {
 		assert!(<MultiPhase<T>>::snapshot().is_none());
 		assert!(<MultiPhase<T>>::current_phase().is_unsigned());
@@ -318,7 +319,7 @@ frame_benchmarking::benchmarks! {
 	submit {
 		// the queue is full and the solution is only better than the worse.
 		<MultiPhase<T>>::create_snapshot().map_err(<&str>::from)?;
-		MultiPhase::<T>::on_initialize_open_signed();
+		<MultiPhase<T>>::phase_transition(Phase::Signed);
 		<Round<T>>::put(1);
 
 		let mut signed_submissions = SignedSubmissions::<T>::get();