Collective pallet: max proposal weight (paritytech#13771)

* collective: max proposal weight

* fix test

---------

Co-authored-by: parity-processbot <>

Author: muharem

bin/node/runtime/src/lib.rs

@@ -210,6 +210,7 @@ parameter_types! {
 		})
 		.avg_block_initialization(AVERAGE_ON_INITIALIZE_RATIO)
 		.build_or_panic();
+	pub MaxCollectivesProposalWeight: Weight = Perbill::from_percent(50) * RuntimeBlockWeights::get().max_block;
 }
 
 const_assert!(NORMAL_DISPATCH_RATIO.deconstruct() >= AVERAGE_ON_INITIALIZE_RATIO.deconstruct());
@@ -1012,6 +1013,7 @@ impl pallet_collective::Config<CouncilCollective> for Runtime {
 	type DefaultVote = pallet_collective::PrimeDefaultVote;
 	type WeightInfo = pallet_collective::weights::SubstrateWeight<Runtime>;
 	type SetMembersOrigin = EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxCollectivesProposalWeight;
 }
 
 parameter_types! {
@@ -1072,6 +1074,7 @@ impl pallet_collective::Config<TechnicalCollective> for Runtime {
 	type DefaultVote = pallet_collective::PrimeDefaultVote;
 	type WeightInfo = pallet_collective::weights::SubstrateWeight<Runtime>;
 	type SetMembersOrigin = EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxCollectivesProposalWeight;
 }
 
 type EnsureRootOrHalfCouncil = EitherOfDiverse<
@@ -1700,6 +1703,7 @@ impl pallet_collective::Config<AllianceCollective> for Runtime {
 	type DefaultVote = pallet_collective::PrimeDefaultVote;
 	type WeightInfo = pallet_collective::weights::SubstrateWeight<Runtime>;
 	type SetMembersOrigin = EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxCollectivesProposalWeight;
 }
 
 parameter_types! {

frame/alliance/src/mock.rs

@@ -43,10 +43,12 @@ type AccountId = u64;
 
 parameter_types! {
 	pub const BlockHashCount: BlockNumber = 250;
+	pub BlockWeights: frame_system::limits::BlockWeights =
+		frame_system::limits::BlockWeights::simple_max(Weight::MAX);
 }
 impl frame_system::Config for Test {
 	type BaseCallFilter = frame_support::traits::Everything;
-	type BlockWeights = ();
+	type BlockWeights = BlockWeights;
 	type BlockLength = ();
 	type RuntimeOrigin = RuntimeOrigin;
 	type RuntimeCall = RuntimeCall;
@@ -97,6 +99,7 @@ parameter_types! {
 	pub const MotionDuration: BlockNumber = MOTION_DURATION_IN_BLOCKS;
 	pub const MaxProposals: u32 = 100;
 	pub const MaxMembers: u32 = 100;
+	pub MaxProposalWeight: Weight = sp_runtime::Perbill::from_percent(50) * BlockWeights::get().max_block;
 }
 type AllianceCollective = pallet_collective::Instance1;
 impl pallet_collective::Config<AllianceCollective> for Test {
@@ -109,6 +112,7 @@ impl pallet_collective::Config<AllianceCollective> for Test {
 	type DefaultVote = pallet_collective::PrimeDefaultVote;
 	type WeightInfo = ();
 	type SetMembersOrigin = EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxProposalWeight;
 }
 
 parameter_types! {

frame/collective/src/lib.rs

@@ -217,6 +217,10 @@ pub mod pallet {
 
 		/// Origin allowed to set collective members
 		type SetMembersOrigin: EnsureOrigin<<Self as frame_system::Config>::RuntimeOrigin>;
+
+		/// The maximum weight of a dispatch call that can be proposed and executed.
+		#[pallet::constant]
+		type MaxProposalWeight: Get<Weight>;
 	}
 
 	#[pallet::genesis_config]
@@ -667,6 +671,11 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	) -> Result<(u32, DispatchResultWithPostInfo), DispatchError> {
 		let proposal_len = proposal.encoded_size();
 		ensure!(proposal_len <= length_bound as usize, Error::<T, I>::WrongProposalLength);
+		let proposal_weight = proposal.get_dispatch_info().weight;
+		ensure!(
+			proposal_weight.all_lte(T::MaxProposalWeight::get()),
+			Error::<T, I>::WrongProposalWeight
+		);
 
 		let proposal_hash = T::Hashing::hash_of(&proposal);
 		ensure!(!<ProposalOf<T, I>>::contains_key(proposal_hash), Error::<T, I>::DuplicateProposal);
@@ -689,6 +698,11 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	) -> Result<(u32, u32), DispatchError> {
 		let proposal_len = proposal.encoded_size();
 		ensure!(proposal_len <= length_bound as usize, Error::<T, I>::WrongProposalLength);
+		let proposal_weight = proposal.get_dispatch_info().weight;
+		ensure!(
+			proposal_weight.all_lte(T::MaxProposalWeight::get()),
+			Error::<T, I>::WrongProposalWeight
+		);
 
 		let proposal_hash = T::Hashing::hash_of(&proposal);
 		ensure!(!<ProposalOf<T, I>>::contains_key(proposal_hash), Error::<T, I>::DuplicateProposal);

frame/collective/src/tests.rs

@@ -90,10 +90,13 @@ pub type MaxMembers = ConstU32<100>;
 parameter_types! {
 	pub const MotionDuration: u64 = 3;
 	pub const MaxProposals: u32 = 257;
+	pub BlockWeights: frame_system::limits::BlockWeights =
+		frame_system::limits::BlockWeights::simple_max(Weight::MAX);
+	pub static MaxProposalWeight: Weight = default_max_proposal_weight();
 }
 impl frame_system::Config for Test {
 	type BaseCallFilter = frame_support::traits::Everything;
-	type BlockWeights = ();
+	type BlockWeights = BlockWeights;
 	type BlockLength = ();
 	type DbWeight = ();
 	type RuntimeOrigin = RuntimeOrigin;
@@ -127,6 +130,7 @@ impl Config<Instance1> for Test {
 	type DefaultVote = PrimeDefaultVote;
 	type WeightInfo = ();
 	type SetMembersOrigin = EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxProposalWeight;
 }
 impl Config<Instance2> for Test {
 	type RuntimeOrigin = RuntimeOrigin;
@@ -138,6 +142,7 @@ impl Config<Instance2> for Test {
 	type DefaultVote = MoreThanMajorityThenPrimeDefaultVote;
 	type WeightInfo = ();
 	type SetMembersOrigin = EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxProposalWeight;
 }
 impl mock_democracy::Config for Test {
 	type RuntimeEvent = RuntimeEvent;
@@ -153,6 +158,7 @@ impl Config for Test {
 	type DefaultVote = PrimeDefaultVote;
 	type WeightInfo = ();
 	type SetMembersOrigin = EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxProposalWeight;
 }
 
 pub struct ExtBuilder {}
@@ -201,6 +207,10 @@ fn record(event: RuntimeEvent) -> EventRecord<RuntimeEvent, H256> {
 	EventRecord { phase: Phase::Initialization, event, topics: vec![] }
 }
 
+fn default_max_proposal_weight() -> Weight {
+	sp_runtime::Perbill::from_percent(80) * BlockWeights::get().max_block
+}
+
 #[test]
 fn motions_basic_environment_works() {
 	ExtBuilder::default().build_and_execute(|| {
@@ -209,6 +219,36 @@ fn motions_basic_environment_works() {
 	});
 }
 
+#[test]
+fn proposal_weight_limit_works() {
+	ExtBuilder::default().build_and_execute(|| {
+		let proposal = make_proposal(42);
+		let proposal_len: u32 = proposal.using_encoded(|p| p.len() as u32);
+
+		assert_ok!(Collective::propose(
+			RuntimeOrigin::signed(1),
+			2,
+			Box::new(proposal.clone()),
+			proposal_len
+		));
+
+		// set a small limit for max proposal weight.
+		MaxProposalWeight::set(Weight::from_parts(1, 1));
+		assert_noop!(
+			Collective::propose(
+				RuntimeOrigin::signed(1),
+				2,
+				Box::new(proposal.clone()),
+				proposal_len
+			),
+			Error::<Test, Instance1>::WrongProposalWeight
+		);
+
+		// reset the max weight to default.
+		MaxProposalWeight::set(default_max_proposal_weight());
+	});
+}
+
 #[test]
 fn close_works() {
 	ExtBuilder::default().build_and_execute(|| {

frame/utility/src/tests.rs

@@ -209,6 +209,7 @@ parameter_types! {
 	pub const MotionDuration: BlockNumber = MOTION_DURATION_IN_BLOCKS;
 	pub const MaxProposals: u32 = 100;
 	pub const MaxMembers: u32 = 100;
+	pub MaxProposalWeight: Weight = sp_runtime::Perbill::from_percent(50) * BlockWeights::get().max_block;
 }
 
 type CouncilCollective = pallet_collective::Instance1;
@@ -222,6 +223,7 @@ impl pallet_collective::Config<CouncilCollective> for Test {
 	type DefaultVote = pallet_collective::PrimeDefaultVote;
 	type WeightInfo = ();
 	type SetMembersOrigin = frame_system::EnsureRoot<Self::AccountId>;
+	type MaxProposalWeight = MaxProposalWeight;
 }
 
 impl example::Config for Test {}