Authorized transactions (user, preimage) should be for free - part 1

Author: bkontur

Cargo.lock

@@ -102,6 +102,7 @@ pallet-grandpa = { git = "https://github.com/paritytech/polkadot-sdk.git", rev =
 pallet-offences = { git = "https://github.com/paritytech/polkadot-sdk.git", rev = "23cac32cb789a6a6e3a071a3f5cd293737098b71", default-features = false }
 pallet-proxy = { git = "https://github.com/paritytech/polkadot-sdk.git", rev = "23cac32cb789a6a6e3a071a3f5cd293737098b71", default-features = false }
 pallet-session = { git = "https://github.com/paritytech/polkadot-sdk.git", rev = "23cac32cb789a6a6e3a071a3f5cd293737098b71", default-features = false }
+pallet-skip-feeless-payment = { git = "https://github.com/paritytech/polkadot-sdk.git", rev = "23cac32cb789a6a6e3a071a3f5cd293737098b71", default-features = false }
 pallet-sudo = { git = "https://github.com/paritytech/polkadot-sdk.git", rev = "23cac32cb789a6a6e3a071a3f5cd293737098b71", default-features = false }
 pallet-timestamp = { git = "https://github.com/paritytech/polkadot-sdk.git", rev = "23cac32cb789a6a6e3a071a3f5cd293737098b71", default-features = false }
 pallet-transaction-payment = { git = "https://github.com/paritytech/polkadot-sdk.git", rev = "23cac32cb789a6a6e3a071a3f5cd293737098b71", default-features = false }

Cargo.toml

@@ -334,6 +334,7 @@ pub mod pallet {
 		/// O(n*log(n)) of data size, as all data is pushed to an in-memory trie.
 		#[pallet::call_index(0)]
 		#[pallet::weight(T::WeightInfo::store(data.len() as u32))]
+		#[pallet::feeless_if(|origin: &OriginFor<T>, data: &Vec<u8>| -> bool { /*TODO: add here correct validation */ true })]
 		pub fn store(_origin: OriginFor<T>, data: Vec<u8>) -> DispatchResult {
 			// In the case of a regular unsigned transaction, this should have been checked by
 			// pre_dispatch. In the case of a regular signed transaction, this should have been

pallets/transaction-storage/src/lib.rs

@@ -32,6 +32,7 @@ pallet-authorship = { workspace = true }
 pallet-balances = { workspace = true }
 pallet-message-queue = { workspace = true }
 pallet-session = { workspace = true }
+pallet-skip-feeless-payment = { workspace = true }
 pallet-sudo = { workspace = true }
 pallet-timestamp = { workspace = true }
 pallet-transaction-payment = { workspace = true }
@@ -114,6 +115,7 @@ std = [
 	"pallet-collator-selection/std",
 	"pallet-message-queue/std",
 	"pallet-session/std",
+	"pallet-skip-feeless-payment/std",
 	"pallet-sudo/std",
 	"pallet-timestamp/std",
 	"pallet-transaction-payment-rpc-runtime-api/std",

runtimes/bulletin-westend/Cargo.toml

@@ -112,7 +112,10 @@ pub type TxExtension = cumulus_pallet_weight_reclaim::StorageWeightReclaim<
 		frame_system::CheckEra<Runtime>,
 		frame_system::CheckNonce<Runtime>,
 		frame_system::CheckWeight<Runtime>,
-		pallet_transaction_payment::ChargeTransactionPayment<Runtime>,
+		pallet_skip_feeless_payment::SkipCheckIfFeeless<
+			Runtime,
+			pallet_transaction_payment::ChargeTransactionPayment<Runtime>,
+		>,
 		ValidateSigned,
 		frame_metadata_hash_extension::CheckMetadataHash<Runtime>,
 	),
@@ -531,11 +534,8 @@ impl pallet_collator_selection::Config for Runtime {
 	type WeightInfo = weights::pallet_collator_selection::WeightInfo<Runtime>;
 }
 
-parameter_types! {
-	/// One storage item; key size is 32; value is size 4+4+16+32 bytes = 56 bytes.
-	pub const DepositBase: Balance = deposit(1, 88);
-	/// Additional storage item size of 32 bytes.
-	pub const DepositFactor: Balance = deposit(0, 32);
+impl pallet_skip_feeless_payment::Config for Runtime {
+	type RuntimeEvent = RuntimeEvent;
 }
 
 impl pallet_sudo::Config for Runtime {
@@ -558,6 +558,7 @@ construct_runtime!(
 		// Monetary stuff.
 		Balances: pallet_balances = 10,
 		TransactionPayment: pallet_transaction_payment = 11,
+		SkipFeelessPayment: pallet_skip_feeless_payment = 12,
 
 		// Storage
 		TransactionStorage: pallet_transaction_storage = 40,