Use Option<Weight> for contract dry-runs (#12429)

substrate/frame/contracts/src/lib.rs

@@ -105,7 +105,7 @@ use crate::{
 	wasm::{OwnerInfo, PrefabWasmModule},
 	weights::WeightInfo,
 };
-use codec::{Encode, HasCompact};
+use codec::{Codec, Encode, HasCompact};
 use frame_support::{
 	dispatch::{Dispatchable, GetDispatchInfo, Pays, PostDispatchInfo},
 	ensure,
@@ -1171,3 +1171,58 @@ where
 		Weight::from(gas_limit).set_proof_size(u64::from(T::MaxCodeLen::get()) * 2)
 	}
 }
+
+sp_api::decl_runtime_apis! {
+	/// The API used to dry-run contract interactions.
+	pub trait ContractsApi<AccountId, Balance, BlockNumber, Hash> where
+		AccountId: Codec,
+		Balance: Codec,
+		BlockNumber: Codec,
+		Hash: Codec,
+	{
+		/// Perform a call from a specified account to a given contract.
+		///
+		/// See [`crate::Pallet::bare_call`].
+		fn call(
+			origin: AccountId,
+			dest: AccountId,
+			value: Balance,
+			gas_limit: Option<Weight>,
+			storage_deposit_limit: Option<Balance>,
+			input_data: Vec<u8>,
+		) -> ContractExecResult<Balance>;
+
+		/// Instantiate a new contract.
+		///
+		/// See `[crate::Pallet::bare_instantiate]`.
+		fn instantiate(
+			origin: AccountId,
+			value: Balance,
+			gas_limit: Option<Weight>,
+			storage_deposit_limit: Option<Balance>,
+			code: Code<Hash>,
+			data: Vec<u8>,
+			salt: Vec<u8>,
+		) -> ContractInstantiateResult<AccountId, Balance>;
+
+
+		/// Upload new code without instantiating a contract from it.
+		///
+		/// See [`crate::Pallet::bare_upload_code`].
+		fn upload_code(
+			origin: AccountId,
+			code: Vec<u8>,
+			storage_deposit_limit: Option<Balance>,
+		) -> CodeUploadResult<Hash, Balance>;
+
+		/// Query a given storage key in a given contract.
+		///
+		/// Returns `Ok(Some(Vec<u8>))` if the storage value exists under the given key in the
+		/// specified account and `Ok(None)` if it doesn't. If the account specified by the address
+		/// doesn't exist, or doesn't have a contract then `Err` is returned.
+		fn get_storage(
+			address: AccountId,
+			key: Vec<u8>,
+		) -> GetStorageResult;
+	}
+}