contracts: Allow contracts to dispatch calls into the runtime (#9276)

* contracts: Allow contracts to dispatch calls into the runtime

* Fix RPC tests

* Fix typo

* Replace () by AllowAllFilter and DenyAllFilter

* Add rust doc

* Fixup for `()` removal

* Fix lowest gas calculation

* Rename AllowAllFilter and DenyAllFilter

* Updated changelog

substrate/frame/support/src/dispatch.rs

@@ -2684,7 +2684,7 @@ mod tests {
 		type Origin = OuterOrigin;
 		type AccountId = u32;
 		type Call = ();
-		type BaseCallFilter = ();
+		type BaseCallFilter = frame_support::traits::AllowAll;
 		type BlockNumber = u32;
 		type PalletInfo = Self;
 		type DbWeight = ();

substrate/frame/support/src/traits.rs

@@ -45,6 +45,7 @@ pub use validation::{
 mod filter;
 pub use filter::{
 	Filter, FilterStack, FilterStackGuard, ClearFilterGuard, InstanceFilter, IntegrityTest,
+	AllowAll, DenyAll,
 };
 
 mod misc;

substrate/frame/support/src/traits/filter.rs

@@ -25,10 +25,20 @@ pub trait Filter<T> {
 	fn filter(_: &T) -> bool;
 }
 
-impl<T> Filter<T> for () {
+/// A [`Filter`] that allows any value.
+pub enum AllowAll {}
+
+/// A [`Filter`] that denies any value.
+pub enum DenyAll {}
+
+impl<T> Filter<T> for AllowAll {
 	fn filter(_: &T) -> bool { true }
 }
 
+impl<T> Filter<T> for DenyAll {
+	fn filter(_: &T) -> bool { false }
+}
+
 /// Trait to add a constraint onto the filter.
 pub trait FilterStack<T>: Filter<T> {
 	/// The type used to archive the stack.

substrate/frame/support/test/tests/construct_runtime.rs

@@ -225,7 +225,7 @@ pub type BlockNumber = u64;
 pub type Index = u64;
 
 impl system::Config for Runtime {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type Hash = H256;
 	type Origin = Origin;
 	type BlockNumber = BlockNumber;

substrate/frame/support/test/tests/instance.rs

@@ -255,7 +255,7 @@ pub type BlockNumber = u64;
 pub type Index = u64;
 
 impl system::Config for Runtime {
-	type BaseCallFilter= ();
+	type BaseCallFilter= frame_support::traits::AllowAll;
 	type Hash = H256;
 	type Origin = Origin;
 	type BlockNumber = BlockNumber;

substrate/frame/support/test/tests/issue2219.rs

@@ -158,7 +158,7 @@ pub type Block = generic::Block<Header, UncheckedExtrinsic>;
 pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<u32, Call, Signature, ()>;
 
 impl system::Config for Runtime {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type Hash = H256;
 	type Origin = Origin;
 	type BlockNumber = BlockNumber;

substrate/frame/support/test/tests/pallet.rs

@@ -448,7 +448,7 @@ frame_support::parameter_types!(
 );
 
 impl frame_system::Config for Runtime {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type Origin = Origin;
 	type Index = u64;
 	type BlockNumber = u32;

substrate/frame/support/test/tests/pallet_compatibility.rs

@@ -203,7 +203,7 @@ frame_support::parameter_types!(
 );
 
 impl frame_system::Config for Runtime {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type Origin = Origin;
 	type Index = u64;
 	type BlockNumber = u32;

substrate/frame/support/test/tests/pallet_compatibility_instance.rs

@@ -198,7 +198,7 @@ impl frame_system::Config for Runtime {
 	type BlockWeights = ();
 	type BlockLength = ();
 	type DbWeight = ();
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type Origin = Origin;
 	type Index = u64;
 	type BlockNumber = u32;

substrate/frame/support/test/tests/pallet_instance.rs

@@ -250,7 +250,7 @@ frame_support::parameter_types!(
 );
 
 impl frame_system::Config for Runtime {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type Origin = Origin;
 	type Index = u64;
 	type BlockNumber = u32;

substrate/frame/support/test/tests/pallet_version.rs

@@ -144,7 +144,7 @@ frame_support::parameter_types!(
 );
 
 impl frame_system::Config for Runtime {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type Origin = Origin;
 	type Index = u64;
 	type BlockNumber = BlockNumber;

substrate/frame/support/test/tests/pallet_with_name_trait_is_valid.rs

@@ -126,7 +126,7 @@ mod tests {
 	}
 
 	impl frame_system::Config for Runtime {
-		type BaseCallFilter = ();
+		type BaseCallFilter = frame_support::traits::AllowAll;
 		type Origin = Origin;
 		type Index = u64;
 		type BlockNumber = u64;