FRAME: Meta Transaction

Cargo.toml

@@ -372,6 +372,7 @@ members = [
 	"substrate/frame/membership",
 	"substrate/frame/merkle-mountain-range",
 	"substrate/frame/message-queue",
+	"substrate/frame/meta-tx",
 	"substrate/frame/metadata-hash-extension",
 	"substrate/frame/migrations",
 	"substrate/frame/mixnet",
@@ -948,6 +949,7 @@ pallet-insecure-randomness-collective-flip = { path = "substrate/frame/insecure-
 pallet-lottery = { default-features = false, path = "substrate/frame/lottery" }
 pallet-membership = { path = "substrate/frame/membership", default-features = false }
 pallet-message-queue = { path = "substrate/frame/message-queue", default-features = false }
+pallet-meta-tx = { path = "substrate/frame/meta-tx", default-features = false }
 pallet-migrations = { path = "substrate/frame/migrations", default-features = false }
 pallet-minimal-template = { path = "templates/minimal/pallets/template", default-features = false }
 pallet-mixnet = { default-features = false, path = "substrate/frame/mixnet" }

polkadot/runtime/westend/Cargo.toml

@@ -69,6 +69,7 @@ pallet-identity = { workspace = true }
 pallet-indices = { workspace = true }
 pallet-membership = { workspace = true }
 pallet-message-queue = { workspace = true }
+pallet-meta-tx = { workspace = true }
 pallet-migrations = { workspace = true }
 pallet-mmr = { workspace = true }
 pallet-multisig = { workspace = true }
@@ -170,6 +171,7 @@ std = [
 	"pallet-indices/std",
 	"pallet-membership/std",
 	"pallet-message-queue/std",
+	"pallet-meta-tx/std",
 	"pallet-migrations/std",
 	"pallet-mmr/std",
 	"pallet-multisig/std",
@@ -261,6 +263,7 @@ runtime-benchmarks = [
 	"pallet-indices/runtime-benchmarks",
 	"pallet-membership/runtime-benchmarks",
 	"pallet-message-queue/runtime-benchmarks",
+	"pallet-meta-tx/runtime-benchmarks",
 	"pallet-migrations/runtime-benchmarks",
 	"pallet-mmr/runtime-benchmarks",
 	"pallet-multisig/runtime-benchmarks",
@@ -324,6 +327,7 @@ try-runtime = [
 	"pallet-indices/try-runtime",
 	"pallet-membership/try-runtime",
 	"pallet-message-queue/try-runtime",
+	"pallet-meta-tx/try-runtime",
 	"pallet-migrations/try-runtime",
 	"pallet-mmr/try-runtime",
 	"pallet-multisig/try-runtime",

polkadot/runtime/westend/src/lib.rs

@@ -1581,6 +1581,31 @@ impl OnSwap for SwapLeases {
 	}
 }
 
+pub type MetaTxExtension = (
+	frame_system::CheckNonZeroSender<Runtime>,
+	frame_system::CheckSpecVersion<Runtime>,
+	frame_system::CheckTxVersion<Runtime>,
+	frame_system::CheckGenesis<Runtime>,
+	frame_system::CheckEra<Runtime>,
+	frame_system::CheckNonce<Runtime>,
+	frame_metadata_hash_extension::CheckMetadataHash<Runtime>,
+);
+
+impl pallet_meta_tx::Config for Runtime {
+	type WeightInfo = weights::pallet_meta_tx::WeightInfo<Runtime>;
+	type RuntimeOrigin = RuntimeOrigin;
+	type RuntimeEvent = RuntimeEvent;
+	type RuntimeCall = RuntimeCall;
+	type Signature = Signature;
+	type PublicKey = <Signature as sp_runtime::traits::Verify>::Signer;
+	#[cfg(not(feature = "runtime-benchmarks"))]
+	type Extension = MetaTxExtension;
+	#[cfg(feature = "runtime-benchmarks")]
+	type Extension = pallet_meta_tx::WeightlessExtension<Runtime>;
+	#[cfg(feature = "runtime-benchmarks")]
+	type BenchmarkHelper = pallet_meta_tx::BenchmarkHelperFor<Runtime>;
+}
+
 #[frame_support::runtime(legacy_ordering)]
 mod runtime {
 	#[runtime::runtime]
@@ -1773,6 +1798,9 @@ mod runtime {
 	#[runtime::pallet_index(102)]
 	pub type RootTesting = pallet_root_testing;
 
+	#[runtime::pallet_index(103)]
+	pub type MetaTx = pallet_meta_tx::Pallet<Runtime>;
+
 	// BEEFY Bridges support.
 	#[runtime::pallet_index(200)]
 	pub type Beefy = pallet_beefy;
@@ -1916,6 +1944,7 @@ mod benches {
 		[pallet_vesting, Vesting]
 		[pallet_whitelist, Whitelist]
 		[pallet_asset_rate, AssetRate]
+		[pallet_meta_tx, MetaTx]
 		// XCM
 		[pallet_xcm, PalletXcmExtrinsicsBenchmark::<Runtime>]
 		// NOTE: Make sure you point to the individual modules below.

polkadot/runtime/westend/src/weights/mod.rs

@@ -28,6 +28,7 @@ pub mod pallet_fast_unstake;
 pub mod pallet_identity;
 pub mod pallet_indices;
 pub mod pallet_message_queue;
+pub mod pallet_meta_tx;
 pub mod pallet_migrations;
 pub mod pallet_mmr;
 pub mod pallet_multisig;

polkadot/runtime/westend/src/weights/pallet_meta_tx.rs

@@ -0,0 +1,57 @@
+// Copyright (C) Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Polkadot is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Autogenerated weights for `pallet_meta_tx`
+//!
+//! THIS FILE WAS AUTO-GENERATED USING THE SUBSTRATE BENCHMARK CLI VERSION 32.0.0
+//! DATE: 2024-11-08, STEPS: `50`, REPEAT: `2`, LOW RANGE: `[]`, HIGH RANGE: `[]`
+//! WORST CASE MAP SIZE: `1000000`
+//! HOSTNAME: `cob`, CPU: `<UNKNOWN>`
+//! WASM-EXECUTION: `Compiled`, CHAIN: `Some("westend-dev")`, DB CACHE: 1024
+
+// Executed Command:
+// ./target/debug/polkadot
+// benchmark
+// pallet
+// --chain=westend-dev
+// --steps=50
+// --repeat=2
+// --pallet=pallet-meta-tx
+// --extrinsic=*
+// --wasm-execution=compiled
+// --heap-pages=4096
+// --output=./polkadot/runtime/westend/src/weights/
+
+#![cfg_attr(rustfmt, rustfmt_skip)]
+#![allow(unused_parens)]
+#![allow(unused_imports)]
+#![allow(missing_docs)]
+
+use frame_support::{traits::Get, weights::Weight};
+use core::marker::PhantomData;
+
+/// Weight functions for `pallet_meta_tx`.
+pub struct WeightInfo<T>(PhantomData<T>);
+impl<T: frame_system::Config> pallet_meta_tx::WeightInfo for WeightInfo<T> {
+	fn bare_dispatch() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 138_000_000 picoseconds.
+		Weight::from_parts(140_000_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
+}

prdoc/pr_6428.prdoc

@@ -0,0 +1,27 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: "FRAME: Meta Transaction"
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      Introduces the meta-tx pallet that implements Meta Transactions.
+
+      The meta transaction follows a layout similar to that of a regular transaction and can
+      leverage the same extensions that implement the `TransactionExtension` trait. Once signed and
+      shared by the signer, it can be relayed by a relayer. The relayer then submits a regular
+      transaction with the `meta-tx::dispatch` call, passing the signed meta transaction as an
+      argument.
+
+      To see an example, refer to the `sign_and_execute_meta_tx` test case within the pallet.
+
+crates:
+- name: pallet-meta-tx
+  bump: major
+- name: westend-runtime
+  bump: major
+- name: kitchensink-runtime
+  bump: major
+- name: polkadot-sdk
+  bump: major

substrate/bin/node/runtime/src/lib.rs

@@ -2365,6 +2365,31 @@ impl pallet_parameters::Config for Runtime {
 	type WeightInfo = ();
 }
 
+pub type MetaTxExtension = (
+	frame_system::CheckNonZeroSender<Runtime>,
+	frame_system::CheckSpecVersion<Runtime>,
+	frame_system::CheckTxVersion<Runtime>,
+	frame_system::CheckGenesis<Runtime>,
+	frame_system::CheckEra<Runtime>,
+	frame_system::CheckNonce<Runtime>,
+	frame_metadata_hash_extension::CheckMetadataHash<Runtime>,
+);
+
+impl pallet_meta_tx::Config for Runtime {
+	type WeightInfo = ();
+	type RuntimeOrigin = RuntimeOrigin;
+	type RuntimeEvent = RuntimeEvent;
+	type RuntimeCall = RuntimeCall;
+	type Signature = Signature;
+	type PublicKey = <Signature as sp_runtime::traits::Verify>::Signer;
+	#[cfg(not(feature = "runtime-benchmarks"))]
+	type Extension = MetaTxExtension;
+	#[cfg(feature = "runtime-benchmarks")]
+	type Extension = pallet_meta_tx::WeightlessExtension<Runtime>;
+	#[cfg(feature = "runtime-benchmarks")]
+	type BenchmarkHelper = pallet_meta_tx::BenchmarkHelperFor<Runtime>;
+}
+
 #[frame_support::runtime]
 mod runtime {
 	use super::*;
@@ -2629,6 +2654,9 @@ mod runtime {
 
 	#[runtime::pallet_index(81)]
 	pub type VerifySignature = pallet_verify_signature::Pallet<Runtime>;
+
+	#[runtime::pallet_index(82)]
+	pub type MetaTx = pallet_meta_tx::Pallet<Runtime>;
 }
 
 impl TryFrom<RuntimeCall> for pallet_revive::Call<Runtime> {
@@ -2889,6 +2917,7 @@ mod benches {
 		[pallet_example_mbm, PalletExampleMbms]
 		[pallet_asset_conversion_ops, AssetConversionMigration]
 		[pallet_verify_signature, VerifySignature]
+		[pallet_meta_tx, MetaTx]
 	);
 }
 

substrate/frame/meta-tx/Cargo.toml

@@ -0,0 +1,60 @@
+[package]
+name = "pallet-meta-tx"
+description = "Dispatch Meta Transaction"
+license = "Apache-2.0"
+version = "0.1.0"
+edition.workspace = true
+authors.workspace = true
+homepage.workspace = true
+repository.workspace = true
+
+[lints]
+workspace = true
+
+[dependencies]
+codec = { workspace = true, features = ["max-encoded-len"] }
+docify = { workspace = true }
+scale-info = { workspace = true, features = ["derive"] }
+serde = { features = ["derive"], optional = true, workspace = true }
+
+frame-benchmarking = { workspace = true, optional = true }
+frame-support = { workspace = true }
+frame-system = { workspace = true }
+sp-core = { workspace = true }
+sp-runtime = { workspace = true }
+sp-std = { workspace = true }
+sp-io = { workspace = true}
+
+[dev-dependencies]
+pallet-balances = { workspace = true, default-features = true }
+pallet-transaction-payment = { workspace = true, default-features = true }
+sp-keyring = { workspace = true, default-features = true }
+sp-keystore ={ workspace = true, default-features = true }
+
+[features]
+default = ["std"] 
+std = [
+	"codec/std",
+	"frame-benchmarking?/std",
+	"frame-support/std",
+	"frame-system/std",
+	"scale-info/std",
+	"serde",
+	"sp-core/std",
+	"sp-runtime/std",
+	"sp-std/std",
+	"sp-io/std",
+]
+runtime-benchmarks = [
+	"frame-benchmarking/runtime-benchmarks",
+	"frame-support/runtime-benchmarks",
+	"frame-system/runtime-benchmarks",
+	"sp-runtime/runtime-benchmarks",
+]
+try-runtime = [
+	"frame-support/try-runtime",
+	"frame-system/try-runtime",
+	"sp-runtime/try-runtime",
+	"pallet-balances/try-runtime",
+	"pallet-transaction-payment/try-runtime",
+]