Add remote proxy support to AH Kusama

CHANGELOG.md

@@ -24,6 +24,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Delegate stake pools in Kusama ([polkadot-fellows/runtimes#540](https://github.com/polkadot-fellows/runtimes/pull/540))
 - Snowbridge: Add support for bridging Ether ([polkadot-fellows/runtimes#548](https://github.com/polkadot-fellows/runtimes/pull/548))
 
+- Adds support for remote proxies on AssetHub Polkadot and AssetHub Kusama. ‼️ Builders: Please read the docs and the implications around the lifetime of a proxy on a remote chain. ‼️ ([polkadot-fellows/runtimes#535](https://github.com/polkadot-fellows/runtimes/pull/535))
+
 ### Changed
 
 - Kusama Treasury: remove funding to the Kappa Sigma Mu Society and disable burn ([polkadot-fellows/runtimes#507](https://github.com/polkadot-fellows/runtimes/pull/507))

Cargo.toml

@@ -147,6 +147,7 @@ pallet-proxy = { version = "38.0.0", default-features = false }
 pallet-ranked-collective = { version = "38.2.0", default-features = false }
 pallet-recovery = { version = "38.0.0", default-features = false }
 pallet-referenda = { version = "38.0.0", default-features = false }
+pallet-remote-proxy = { path = "pallets/remote-proxy", default-features = false }
 pallet-salary = { version = "23.2.0", default-features = false }
 pallet-scheduler = { version = "39.0.0", default-features = false }
 pallet-session = { version = "38.0.0", default-features = false }
@@ -229,11 +230,12 @@ sp-offchain = { version = "34.0.0", default-features = false }
 sp-runtime = { version = "39.0.5", default-features = false }
 sp-session = { version = "36.0.0", default-features = false }
 sp-staking = { version = "36.0.0", default-features = false }
+sp-state-machine = { version = "0.43.0", default-features = false }
 sp-std = { version = "14.0.0", default-features = false }
 sp-storage = { version = "21.0.0", default-features = false }
 sp-tracing = { version = "17.0.1", default-features = false }
 sp-transaction-pool = { version = "34.0.0", default-features = false }
-sp-trie = { version = "37.0.0" }
+sp-trie = { version = "37.0.0", default-features = false }
 sp-version = { version = "37.0.0", default-features = false }
 sp-weights = { version = "31.0.0", default-features = false }
 static_assertions = { version = "1.1.0" }
@@ -284,6 +286,7 @@ members = [
 	"integration-tests/emulated/tests/people/people-kusama",
 	"integration-tests/emulated/tests/people/people-polkadot",
 	"integration-tests/zombienet",
+	"pallets/remote-proxy",
 	"relay/common",
 	"relay/kusama",
 	"relay/kusama/constants",

pallets/remote-proxy/Cargo.toml

@@ -0,0 +1,70 @@
+[package]
+name = "pallet-remote-proxy"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+repository.workspace = true
+license.workspace = true
+
+[dependencies]
+codec = { features = ["derive", "max-encoded-len"], workspace = true }
+scale-info = { features = ["derive"], workspace = true }
+
+cumulus-pallet-parachain-system = { workspace = true }
+cumulus-primitives-core = { workspace = true }
+frame-benchmarking = { workspace = true, optional = true }
+frame-support = { workspace = true }
+frame-system = { workspace = true }
+pallet-proxy = { workspace = true }
+sp-core = { workspace = true }
+sp-trie = { workspace = true }
+sp-runtime = { workspace = true }
+
+[dev-dependencies]
+pallet-balances = { workspace = true }
+pallet-utility = { workspace = true }
+sp-io = { workspace = true }
+sp-state-machine = { workspace = true }
+
+[features]
+default = ["std"]
+
+std = [
+	"codec/std",
+	"cumulus-pallet-parachain-system/std",
+	"cumulus-primitives-core/std",
+	"frame-benchmarking/std",
+	"frame-support/std",
+	"frame-system/std",
+	"pallet-balances/std",
+	"pallet-proxy/std",
+	"pallet-utility/std",
+	"scale-info/std",
+	"sp-core/std",
+	"sp-io/std",
+	"sp-runtime/std",
+	"sp-state-machine/std",
+	"sp-trie/std",
+]
+
+try-runtime = [
+	"cumulus-pallet-parachain-system/try-runtime",
+	"frame-support/try-runtime",
+	"frame-system/try-runtime",
+	"pallet-balances/try-runtime",
+	"pallet-proxy/try-runtime",
+	"pallet-utility/try-runtime",
+	"sp-runtime/try-runtime",
+]
+
+runtime-benchmarks = [
+	"cumulus-pallet-parachain-system/runtime-benchmarks",
+	"cumulus-primitives-core/runtime-benchmarks",
+	"frame-benchmarking/runtime-benchmarks",
+	"frame-support/runtime-benchmarks",
+	"frame-system/runtime-benchmarks",
+	"pallet-balances/runtime-benchmarks",
+	"pallet-proxy/runtime-benchmarks",
+	"pallet-utility/runtime-benchmarks",
+	"sp-runtime/runtime-benchmarks",
+]

pallets/remote-proxy/src/benchmarking.rs

@@ -0,0 +1,133 @@
+// Copyright (C) Polkadot Fellows.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Benchmarks for Remote Proxy Pallet
+
+use super::*;
+use crate::Pallet as RemoteProxy;
+use alloc::{boxed::Box, vec};
+use frame_benchmarking::v2::{
+	account, impl_test_function, instance_benchmarks, whitelisted_caller,
+};
+use frame_support::traits::Currency;
+use frame_system::RawOrigin;
+use sp_runtime::traits::{Bounded, StaticLookup};
+
+const SEED: u32 = 0;
+
+type BalanceOf<T> = <<T as pallet_proxy::Config>::Currency as Currency<
+	<T as frame_system::Config>::AccountId,
+>>::Balance;
+
+fn assert_last_event<T: pallet_proxy::Config>(
+	generic_event: <T as pallet_proxy::Config>::RuntimeEvent,
+) {
+	frame_system::Pallet::<T>::assert_last_event(generic_event.into());
+}
+
+#[instance_benchmarks]
+mod benchmarks {
+	use super::*;
+	use frame_benchmarking::BenchmarkError;
+
+	#[benchmark]
+	fn remote_proxy() -> Result<(), BenchmarkError> {
+		// In this case the caller is the "target" proxy
+		let caller: T::AccountId = account("target", 0, SEED);
+		<T as pallet_proxy::Config>::Currency::make_free_balance_be(
+			&caller,
+			BalanceOf::<T>::max_value() / 2u32.into(),
+		);
+		// ... and "real" is the traditional caller. This is not a typo.
+		let real: T::AccountId = whitelisted_caller();
+		let real_lookup = T::Lookup::unlookup(real.clone());
+		let call: <T as pallet_proxy::Config>::RuntimeCall =
+			frame_system::Call::<T>::remark { remark: vec![] }.into();
+		let (proof, block_number, storage_root) =
+			T::RemoteProxy::create_remote_proxy_proof(&caller, &real);
+		BlockToRoot::<T, I>::insert(block_number, storage_root);
+
+		#[extrinsic_call]
+		_(RawOrigin::Signed(caller), real_lookup, None, Box::new(call), proof);
+
+		assert_last_event::<T>(pallet_proxy::Event::ProxyExecuted { result: Ok(()) }.into());
+
+		Ok(())
+	}
+
+	#[benchmark]
+	fn register_remote_proxy_proof() -> Result<(), BenchmarkError> {
+		// In this case the caller is the "target" proxy
+		let caller: T::AccountId = account("target", 0, SEED);
+		<T as pallet_proxy::Config>::Currency::make_free_balance_be(
+			&caller,
+			BalanceOf::<T>::max_value() / 2u32.into(),
+		);
+		// ... and "real" is the traditional caller. This is not a typo.
+		let real: T::AccountId = whitelisted_caller();
+		let (proof, block_number, storage_root) =
+			T::RemoteProxy::create_remote_proxy_proof(&caller, &real);
+		BlockToRoot::<T, I>::insert(block_number, storage_root);
+
+		#[extrinsic_call]
+		_(RawOrigin::Signed(caller), proof);
+
+		Ok(())
+	}
+
+	#[benchmark]
+	fn remote_proxy_with_registered_proof() -> Result<(), BenchmarkError> {
+		// In this case the caller is the "target" proxy
+		let caller: T::AccountId = account("target", 0, SEED);
+		<T as pallet_proxy::Config>::Currency::make_free_balance_be(
+			&caller,
+			BalanceOf::<T>::max_value() / 2u32.into(),
+		);
+		// ... and "real" is the traditional caller. This is not a typo.
+		let real: T::AccountId = whitelisted_caller();
+		let real_lookup = T::Lookup::unlookup(real.clone());
+		let call: <T as pallet_proxy::Config>::RuntimeCall =
+			frame_system::Call::<T>::remark { remark: vec![] }.into();
+		let (proof, block_number, storage_root) =
+			T::RemoteProxy::create_remote_proxy_proof(&caller, &real);
+		BlockToRoot::<T, I>::insert(block_number, storage_root);
+
+		#[block]
+		{
+			frame_support::dispatch_context::run_in_context(|| {
+				frame_support::dispatch_context::with_context::<
+					crate::RemoteProxyContext<crate::RemoteBlockNumberOf<T, I>>,
+					_,
+				>(|context| {
+					context.or_default().proofs.push(proof.clone());
+				});
+
+				RemoteProxy::<T, I>::remote_proxy_with_registered_proof(
+					RawOrigin::Signed(caller).into(),
+					real_lookup,
+					None,
+					Box::new(call),
+				)
+				.unwrap()
+			})
+		}
+
+		assert_last_event::<T>(pallet_proxy::Event::ProxyExecuted { result: Ok(()) }.into());
+
+		Ok(())
+	}
+
+	impl_benchmark_test_suite!(RemoteProxy, crate::tests::new_test_ext(), crate::tests::Test);
+}