Rename ModuleToIndex to PalletRuntimeSetup (#7148)

* Rename `ModuleToIndex` to `PalletRuntimeSetup`

Besides the renaming it also adds support getting the name of a pallet
as configured in the runtime.

* Rename it to `PalletInfo`

* Remove accidentally added files

substrate/frame/support/src/error.rs

@@ -140,8 +140,8 @@ macro_rules! decl_error {
 			for $crate::sp_runtime::DispatchError
 		{
 			fn from(err: $error<$generic $(, $inst_generic)?>) -> Self {
-				let index = <$generic::ModuleToIndex as $crate::traits::ModuleToIndex>
-					::module_to_index::<$module<$generic $(, $inst_generic)?>>()
+				let index = <$generic::PalletInfo as $crate::traits::PalletInfo>
+					::index::<$module<$generic $(, $inst_generic)?>>()
 					.expect("Every active module has an index in the runtime; qed") as u8;
 
 				$crate::sp_runtime::DispatchError::Module {

substrate/frame/support/src/metadata.rs

@@ -297,7 +297,7 @@ mod tests {
 			type AccountId: From<u32> + Encode;
 			type BlockNumber: From<u32> + Encode;
 			type SomeValue: Get<u32>;
-			type ModuleToIndex: crate::traits::ModuleToIndex;
+			type PalletInfo: crate::traits::PalletInfo;
 			type Call;
 		}
 
@@ -443,7 +443,7 @@ mod tests {
 		type AccountId = u32;
 		type BlockNumber = u32;
 		type SomeValue = SystemValue;
-		type ModuleToIndex = ();
+		type PalletInfo = ();
 		type Call = Call;
 	}
 

substrate/frame/support/src/traits.rs

@@ -1313,8 +1313,6 @@ impl<T: Clone + Ord> ChangeMembers<T> for () {
 	fn set_prime(_: Option<T>) {}
 }
 
-
-
 /// Trait for type that can handle the initialization of account IDs at genesis.
 pub trait InitializeMembers<AccountId> {
 	/// Initialize the members to the given `members`.
@@ -1380,16 +1378,20 @@ pub trait ValidatorRegistration<ValidatorId> {
 	fn is_registered(id: &ValidatorId) -> bool;
 }
 
-/// Something that can convert a given module into the index of the module in the runtime.
+/// Provides information about the pallet setup in the runtime.
 ///
-/// The index of a module is determined by the position it appears in `construct_runtime!`.
-pub trait ModuleToIndex {
-	/// Convert the given module `M` into an index.
-	fn module_to_index<M: 'static>() -> Option<usize>;
+/// An implementor should be able to provide information about each pallet that
+/// is configured in `construct_runtime!`.
+pub trait PalletInfo {
+	/// Convert the given pallet `P` into its index as configured in the runtime.
+	fn index<P: 'static>() -> Option<usize>;
+	/// Convert the given pallet `P` into its name as configured in the runtime.
+	fn name<P: 'static>() -> Option<&'static str>;
 }
 
-impl ModuleToIndex for () {
-	fn module_to_index<M: 'static>() -> Option<usize> { Some(0) }
+impl PalletInfo for () {
+	fn index<P: 'static>() -> Option<usize> { Some(0) }
+	fn name<P: 'static>() -> Option<&'static str> { Some("test") }
 }
 
 /// The function and pallet name of the Call.