git.delta.rocks / unique-network / refs/commits / bfbca7684ca5

--- /dev/null
+++ b/pallets/fungible/Cargo.toml
@@ -0,0 +1,36 @@
+[package]
+name = "pallet-fungible"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '2.0.0'
+
+[dependencies]
+frame-support = { default-features = false, version = '4.0.0-dev', git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.10' }
+frame-system = { default-features = false, version = '4.0.0-dev', git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.10' }
+sp-runtime = { default-features = false, version = '4.0.0-dev', git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.10' }
+sp-std = { default-features = false, version = '4.0.0-dev', git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.10' }
+sp-core = { default-features = false, version = '4.0.0-dev', git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.10' }
+pallet-common = { default-features = false, path = '../common' }
+nft-data-structs = { default-features = false, path = '../../primitives/nft' }
+evm-coder = { default-features = false, path = '../../crates/evm-coder' }
+ethereum = { default-features = false, version = "0.9.0" }
+pallet-evm-coder-substrate = { default-features = false, path = '../evm-coder-substrate' }
+
+[features]
+default = ["std"]
+std = [
+    "frame-support/std",
+    "frame-system/std",
+    "sp-runtime/std",
+    "sp-std/std",
+    "nft-data-structs/std",
+    "pallet-common/std",
+    "evm-coder/std",
+    "ethereum/std",
+]
+runtime-benchmarks = []

--- /dev/null
+++ b/pallets/fungible/src/benchmarking.rs
@@ -0,0 +1 @@
+#![cfg(feature = "runtime-benchmarking")]

--- /dev/null
+++ b/pallets/fungible/src/common.rs
@@ -0,0 +1,220 @@
+use core::marker::PhantomData;
+
+use frame_support::{dispatch::DispatchResultWithPostInfo, ensure, fail, weights::Weight};
+use nft_data_structs::TokenId;
+use pallet_common::{
+	CommonCollectionOperations, CommonWeightInfo, account::CrossAccountId, with_weight,
+};
+use sp_runtime::ArithmeticError;
+use sp_std::{vec::Vec, vec};
+
+use crate::{
+	Allowance, Balance, Config, Error, FungibleHandle, Pallet, SelfWeightOf, weights::WeightInfo,
+};
+
+pub struct CommonWeights<T: Config>(PhantomData<T>);
+impl<T: Config> CommonWeightInfo for CommonWeights<T> {
+	fn create_item() -> Weight {
+		<SelfWeightOf<T>>::create_item()
+	}
+
+	fn create_multiple_items(_amount: u32) -> Weight {
+		Self::create_item()
+	}
+
+	fn burn_item() -> Weight {
+		<SelfWeightOf<T>>::burn_item()
+	}
+
+	fn transfer() -> Weight {
+		<SelfWeightOf<T>>::transfer()
+	}
+
+	fn approve() -> Weight {
+		<SelfWeightOf<T>>::approve()
+	}
+
+	fn transfer_from() -> Weight {
+		<SelfWeightOf<T>>::transfer_from()
+	}
+
+	fn set_variable_metadata(_bytes: u32) -> Weight {
+		// Error
+		0
+	}
+}
+
+impl<T: Config> CommonCollectionOperations<T> for FungibleHandle<T> {
+	fn create_item(
+		&self,
+		sender: T::CrossAccountId,
+		to: T::CrossAccountId,
+		data: nft_data_structs::CreateItemData,
+	) -> DispatchResultWithPostInfo {
+		match data {
+			nft_data_structs::CreateItemData::Fungible(data) => with_weight(
+				<Pallet<T>>::create_item(self, &sender, (to, data.value)),
+				<SelfWeightOf<T>>::create_item(),
+			),
+			_ => fail!(<Error<T>>::NotFungibleDataUsedToMintFungibleCollectionToken),
+		}
+	}
+
+	fn create_multiple_items(
+		&self,
+		sender: T::CrossAccountId,
+		to: T::CrossAccountId,
+		data: Vec<nft_data_structs::CreateItemData>,
+	) -> DispatchResultWithPostInfo {
+		let mut sum: u128 = 0;
+		for data in data {
+			match data {
+				nft_data_structs::CreateItemData::Fungible(data) => {
+					sum = sum
+						.checked_add(data.value)
+						.ok_or(ArithmeticError::Overflow)?;
+				}
+				_ => fail!(<Error<T>>::NotFungibleDataUsedToMintFungibleCollectionToken),
+			}
+		}
+
+		with_weight(
+			<Pallet<T>>::create_item(self, &sender, (to, sum)),
+			<SelfWeightOf<T>>::create_item(),
+		)
+	}
+
+	fn burn_item(
+		&self,
+		sender: T::CrossAccountId,
+		token: TokenId,
+		amount: u128,
+	) -> DispatchResultWithPostInfo {
+		ensure!(
+			token == TokenId::default(),
+			<Error<T>>::FungibleItemsHaveNoId
+		);
+
+		with_weight(
+			<Pallet<T>>::burn(self, &sender, amount),
+			<SelfWeightOf<T>>::burn_item(),
+		)
+	}
+
+	fn transfer(
+		&self,
+		from: T::CrossAccountId,
+		to: T::CrossAccountId,
+		token: TokenId,
+		amount: u128,
+	) -> DispatchResultWithPostInfo {
+		ensure!(
+			token == TokenId::default(),
+			<Error<T>>::FungibleItemsHaveNoId
+		);
+
+		with_weight(
+			<Pallet<T>>::transfer(&self, &from, &to, amount),
+			<SelfWeightOf<T>>::transfer(),
+		)
+	}
+
+	fn approve(
+		&self,
+		sender: T::CrossAccountId,
+		spender: T::CrossAccountId,
+		token: TokenId,
+		amount: u128,
+	) -> DispatchResultWithPostInfo {
+		ensure!(
+			token == TokenId::default(),
+			<Error<T>>::FungibleItemsHaveNoId
+		);
+
+		with_weight(
+			<Pallet<T>>::set_allowance(&self, &sender, &spender, amount),
+			<SelfWeightOf<T>>::approve(),
+		)
+	}
+
+	fn transfer_from(
+		&self,
+		sender: T::CrossAccountId,
+		from: T::CrossAccountId,
+		to: T::CrossAccountId,
+		token: TokenId,
+		amount: u128,
+	) -> DispatchResultWithPostInfo {
+		ensure!(
+			token == TokenId::default(),
+			<Error<T>>::FungibleItemsHaveNoId
+		);
+
+		with_weight(
+			<Pallet<T>>::transfer_from(&self, &sender, &from, &to, amount),
+			<SelfWeightOf<T>>::transfer_from(),
+		)
+	}
+
+	fn set_variable_metadata(
+		&self,
+		_sender: T::CrossAccountId,
+		_token: TokenId,
+		_data: Vec<u8>,
+	) -> DispatchResultWithPostInfo {
+		fail!(<Error<T>>::FungibleItemsHaveData)
+	}
+
+	fn account_tokens(&self, account: T::CrossAccountId) -> Vec<TokenId> {
+		if <Balance<T>>::get((self.id, account.as_sub())) != 0 {
+			vec![TokenId::default()]
+		} else {
+			vec![]
+		}
+	}
+
+	fn token_exists(&self, token: TokenId) -> bool {
+		token == TokenId::default()
+	}
+
+	fn token_owner(&self, _token: TokenId) -> T::CrossAccountId {
+		T::CrossAccountId::default()
+	}
+	fn const_metadata(&self, _token: TokenId) -> Vec<u8> {
+		Vec::new()
+	}
+	fn variable_metadata(&self, _token: TokenId) -> Vec<u8> {
+		Vec::new()
+	}
+
+	fn collection_tokens(&self) -> u32 {
+		1
+	}
+
+	fn account_balance(&self, account: T::CrossAccountId) -> u32 {
+		if <Balance<T>>::get((self.id, account.as_sub())) != 0 {
+			1
+		} else {
+			0
+		}
+	}
+
+	fn balance(&self, account: T::CrossAccountId, token: TokenId) -> u128 {
+		if token != TokenId::default() {
+			return 0;
+		}
+		<Balance<T>>::get((self.id, account.as_sub()))
+	}
+
+	fn allowance(
+		&self,
+		sender: T::CrossAccountId,
+		spender: T::CrossAccountId,
+		token: TokenId,
+	) -> u128 {
+		if token != TokenId::default() {
+			return 0;
+		}
+		<Allowance<T>>::get((self.id, sender.as_sub(), spender.as_sub()))
+	}
+}

--- /dev/null
+++ b/pallets/fungible/src/erc.rs
@@ -0,0 +1,112 @@
+use core::char::{REPLACEMENT_CHARACTER, decode_utf16};
+use core::convert::TryInto;
+use evm_coder::{ToLog, execution::*, generate_stubgen, solidity_interface, types::*};
+use nft_data_structs::CollectionMode;
+use pallet_common::erc::CommonEvmHandler;
+use sp_core::{H160, U256};
+use sp_std::vec::Vec;
+use pallet_common::account::CrossAccountId;
+use pallet_common::erc::PrecompileOutput;
+use pallet_evm_coder_substrate::{call_internal, dispatch_to_evm};
+
+use crate::{Allowance, Balance, Config, FungibleHandle, Pallet, TotalSupply};
+
+#[derive(ToLog)]
+pub enum ERC20Events {
+	Transfer {
+		#[indexed]
+		from: address,
+		#[indexed]
+		to: address,
+		value: uint256,
+	},
+	Approval {
+		#[indexed]
+		owner: address,
+		#[indexed]
+		spender: address,
+		value: uint256,
+	},
+}
+
+#[solidity_interface(name = "ERC20", events(ERC20Events))]
+impl<T: Config> FungibleHandle<T> {
+	fn name(&self) -> Result<string> {
+		Ok(decode_utf16(self.name.iter().copied())
+			.map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))
+			.collect::<string>())
+	}
+	fn symbol(&self) -> Result<string> {
+		Ok(string::from_utf8_lossy(&self.token_prefix).into())
+	}
+	fn total_supply(&self) -> Result<uint256> {
+		Ok(<TotalSupply<T>>::get(self.id).into())
+	}
+
+	fn decimals(&self) -> Result<uint8> {
+		Ok(if let CollectionMode::Fungible(decimals) = &self.mode {
+			*decimals
+		} else {
+			unreachable!()
+		})
+	}
+	fn balance_of(&self, owner: address) -> Result<uint256> {
+		let owner = T::CrossAccountId::from_eth(owner);
+		let balance = <Balance<T>>::get((self.id, owner.as_sub()));
+		Ok(balance.into())
+	}
+	fn transfer(&mut self, caller: caller, to: address, amount: uint256) -> Result<bool> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let to = T::CrossAccountId::from_eth(to);
+		let amount = amount.try_into().map_err(|_| "amount overflow")?;
+
+		<Pallet<T>>::transfer(self, &caller, &to, amount).map_err(|_| "transfer error")?;
+		Ok(true)
+	}
+	fn transfer_from(
+		&mut self,
+		caller: caller,
+		from: address,
+		to: address,
+		amount: uint256,
+	) -> Result<bool> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let from = T::CrossAccountId::from_eth(from);
+		let to = T::CrossAccountId::from_eth(to);
+		let amount = amount.try_into().map_err(|_| "amount overflow")?;
+
+		<Pallet<T>>::transfer_from(self, &caller, &from, &to, amount)
+			.map_err(dispatch_to_evm::<T>)?;
+		Ok(true)
+	}
+	fn approve(&mut self, caller: caller, spender: address, amount: uint256) -> Result<bool> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let spender = T::CrossAccountId::from_eth(spender);
+		let amount = amount.try_into().map_err(|_| "amount overflow")?;
+
+		<Pallet<T>>::set_allowance(self, &caller, &spender, amount)
+			.map_err(dispatch_to_evm::<T>)?;
+		Ok(true)
+	}
+	fn allowance(&self, owner: address, spender: address) -> Result<uint256> {
+		let owner = T::CrossAccountId::from_eth(owner);
+		let spender = T::CrossAccountId::from_eth(spender);
+
+		Ok(<Allowance<T>>::get((self.id, owner.as_sub(), spender.as_sub())).into())
+	}
+}
+
+#[solidity_interface(name = "UniqueFungible", is(ERC20))]
+impl<T: Config> FungibleHandle<T> {}
+
+generate_stubgen!(get_impl, UniqueFungibleCall, true);
+generate_stubgen!(gen_iface, UniqueFungibleCall, false);
+
+impl<T: Config> CommonEvmHandler for FungibleHandle<T> {
+	const CODE: &'static [u8] = include_bytes!("./stubs/UniqueFungible.raw");
+
+	fn call(mut self, source: &H160, input: &[u8], value: U256) -> Option<PrecompileOutput> {
+		let result = call_internal::<UniqueFungibleCall, _>(*source, &mut self, value, input);
+		self.0.recorder.evm_to_precompile_output(result)
+	}
+}

--- /dev/null
+++ b/pallets/fungible/src/lib.rs
@@ -0,0 +1,366 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use core::ops::Deref;
+use frame_support::{ensure};
+use nft_data_structs::{AccessMode, Collection, CollectionId, TokenId};
+use pallet_common::{
+	Error as CommonError, Event as CommonEvent, Pallet as PalletCommon, account::CrossAccountId,
+};
+use sp_core::H160;
+use sp_runtime::{ArithmeticError, DispatchError, DispatchResult};
+use sp_std::{vec::Vec, vec, collections::btree_map::BTreeMap};
+
+pub use pallet::*;
+
+use crate::erc::ERC20Events;
+pub mod benchmarking;
+pub mod common;
+pub mod erc;
+pub mod weights;
+
+pub type CreateItemData<T> = (<T as pallet_common::Config>::CrossAccountId, u128);
+pub(crate) type SelfWeightOf<T> = <T as Config>::WeightInfo;
+
+#[frame_support::pallet]
+pub mod pallet {
+	use frame_support::{Blake2_128, Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key};
+	use nft_data_structs::CollectionId;
+	use super::weights::WeightInfo;
+
+	#[pallet::error]
+	pub enum Error<T> {
+		/// Not Fungible item data used to mint in Fungible collection.
+		NotFungibleDataUsedToMintFungibleCollectionToken,
+		/// Not default id passed as TokenId argument
+		FungibleItemsHaveNoId,
+		/// Tried to set data for fungible item
+		FungibleItemsHaveData,
+	}
+
+	#[pallet::config]
+	pub trait Config: frame_system::Config + pallet_common::Config {
+		type WeightInfo: WeightInfo;
+	}
+
+	#[pallet::pallet]
+	#[pallet::generate_store(pub(super) trait Store)]
+	pub struct Pallet<T>(_);
+
+	#[pallet::storage]
+	pub(super) type TotalSupply<T: Config> =
+		StorageMap<Hasher = Twox64Concat, Key = CollectionId, Value = u128, QueryKind = ValueQuery>;
+
+	#[pallet::storage]
+	pub(super) type Balance<T: Config> = StorageNMap<
+		Key = (
+			Key<Twox64Concat, CollectionId>,
+			Key<Blake2_128Concat, T::AccountId>,
+		),
+		Value = u128,
+		QueryKind = ValueQuery,
+	>;
+
+	#[pallet::storage]
+	pub(super) type Allowance<T: Config> = StorageNMap<
+		Key = (
+			Key<Twox64Concat, CollectionId>,
+			Key<Blake2_128, T::AccountId>,
+			Key<Blake2_128Concat, T::AccountId>,
+		),
+		Value = u128,
+		QueryKind = ValueQuery,
+	>;
+}
+
+pub struct FungibleHandle<T: Config>(pallet_common::CollectionHandle<T>);
+impl<T: Config> FungibleHandle<T> {
+	pub fn cast(inner: pallet_common::CollectionHandle<T>) -> Self {
+		Self(inner)
+	}
+	pub fn into_inner(self) -> pallet_common::CollectionHandle<T> {
+		self.0
+	}
+}
+impl<T: Config> Deref for FungibleHandle<T> {
+	type Target = pallet_common::CollectionHandle<T>;
+
+	fn deref(&self) -> &Self::Target {
+		&self.0
+	}
+}
+
+impl<T: Config> Pallet<T> {
+	pub fn init_collection(data: Collection<T>) -> Result<CollectionId, DispatchError> {
+		PalletCommon::init_collection(data)
+	}
+	pub fn destroy_collection(
+		collection: FungibleHandle<T>,
+		sender: &T::CrossAccountId,
+	) -> DispatchResult {
+		let id = collection.id;
+
+		// =========
+
+		PalletCommon::destroy_collection(collection.0, sender)?;
+
+		<TotalSupply<T>>::remove(id);
+		<Balance<T>>::remove_prefix((id,), None);
+		<Allowance<T>>::remove_prefix((id,), None);
+		Ok(())
+	}
+
+	pub fn burn(
+		collection: &FungibleHandle<T>,
+		owner: &T::CrossAccountId,
+		amount: u128,
+	) -> DispatchResult {
+		let total_supply = <TotalSupply<T>>::get(collection.id)
+			.checked_sub(amount)
+			.ok_or(<CommonError<T>>::TokenValueTooLow)?;
+
+		let balance = <Balance<T>>::get((collection.id, owner.as_sub()))
+			.checked_sub(amount)
+			.ok_or(<CommonError<T>>::TokenValueTooLow)?;
+
+		if collection.access == AccessMode::WhiteList {
+			collection.check_whitelist(owner)?;
+		}
+
+		// =========
+
+		if balance == 0 {
+			<Balance<T>>::remove((collection.id, owner.as_sub()));
+		} else {
+			<Balance<T>>::insert((collection.id, owner.as_sub()), balance);
+		}
+		<TotalSupply<T>>::insert(collection.id, total_supply);
+
+		collection.log_infallible(ERC20Events::Transfer {
+			from: *owner.as_eth(),
+			to: H160::default(),
+			value: amount.into(),
+		});
+		<PalletCommon<T>>::deposit_event(CommonEvent::ItemDestroyed(
+			collection.id,
+			TokenId::default(),
+			owner.clone(),
+			amount,
+		));
+		Ok(())
+	}
+
+	pub fn transfer(
+		collection: &FungibleHandle<T>,
+		from: &T::CrossAccountId,
+		to: &T::CrossAccountId,
+		amount: u128,
+	) -> DispatchResult {
+		ensure!(
+			collection.transfers_enabled,
+			<CommonError<T>>::TransferNotAllowed
+		);
+
+		if collection.access == AccessMode::WhiteList {
+			collection.check_whitelist(from)?;
+			collection.check_whitelist(to)?;
+		}
+		<PalletCommon<T>>::ensure_correct_receiver(to)?;
+
+		let balance_from = <Balance<T>>::get((collection.id, from.as_sub()))
+			.checked_sub(amount)
+			.ok_or(<CommonError<T>>::TokenValueTooLow)?;
+		let balance_to = if from != to {
+			Some(
+				<Balance<T>>::get((collection.id, to.as_sub()))
+					.checked_add(amount)
+					.ok_or(ArithmeticError::Overflow)?,
+			)
+		} else {
+			None
+		};
+
+		collection.consume_sstore()?;
+		collection.consume_sstore()?;
+		collection.consume_log(2, 32)?;
+		collection.consume_sstore()?;
+
+		// =========
+
+		if let Some(balance_to) = balance_to {
+			// from != to
+			if balance_from == 0 {
+				<Balance<T>>::remove((collection.id, from.as_sub()));
+			} else {
+				<Balance<T>>::insert((collection.id, from.as_sub()), balance_from);
+			}
+			<Balance<T>>::insert((collection.id, to.as_sub()), balance_to);
+		}
+
+		collection.log_infallible(ERC20Events::Transfer {
+			from: *from.as_eth(),
+			to: *to.as_eth(),
+			value: amount.into(),
+		});
+		<PalletCommon<T>>::deposit_event(CommonEvent::Transfer(
+			collection.id,
+			TokenId::default(),
+			from.clone(),
+			to.clone(),
+			amount,
+		));
+		Ok(())
+	}
+
+	pub fn create_multiple_items(
+		collection: &FungibleHandle<T>,
+		sender: &T::CrossAccountId,
+		data: Vec<CreateItemData<T>>,
+	) -> DispatchResult {
+		let unrestricted_minting = collection.is_owner_or_admin(sender)?;
+		if !unrestricted_minting {
+			ensure!(
+				collection.mint_mode,
+				<CommonError<T>>::PublicMintingNotAllowed
+			);
+			collection.check_whitelist(sender)?;
+
+			for (owner, _) in data.iter() {
+				collection.check_whitelist(owner)?;
+			}
+		}
+
+		let mut balances = BTreeMap::new();
+
+		let total_supply = data
+			.iter()
+			.map(|u| u.1)
+			.try_fold(0u128, |acc, v| acc.checked_add(v))
+			.ok_or(ArithmeticError::Overflow)?;
+
+		for (user, amount) in data.into_iter() {
+			collection.consume_sload()?;
+			let balance = balances
+				.entry(user.clone())
+				.or_insert_with(|| <Balance<T>>::get((collection.id, user.as_sub())));
+			*balance = (*balance)
+				.checked_add(amount)
+				.ok_or(ArithmeticError::Overflow)?;
+		}
+
+		collection.consume_sstore()?;
+		for _ in &balances {
+			collection.consume_sstore()?;
+			collection.consume_log(2, 32)?;
+			collection.consume_sstore()?;
+		}
+
+		// =========
+
+		<TotalSupply<T>>::insert(collection.id, total_supply);
+		for (user, amount) in balances {
+			<Balance<T>>::insert((collection.id, user.as_sub()), amount);
+
+			collection.log_infallible(ERC20Events::Transfer {
+				from: H160::default(),
+				to: *user.as_eth(),
+				value: amount.into(),
+			});
+			<PalletCommon<T>>::deposit_event(CommonEvent::ItemCreated(
+				collection.id,
+				TokenId::default(),
+				user.clone(),
+				amount,
+			));
+		}
+
+		Ok(())
+	}
+
+	fn set_allowance_unchecked(
+		collection: &FungibleHandle<T>,
+		owner: &T::CrossAccountId,
+		spender: &T::CrossAccountId,
+		amount: u128,
+	) {
+		<Allowance<T>>::insert((collection.id, owner.as_sub(), spender.as_sub()), amount);
+
+		collection.log_infallible(ERC20Events::Approval {
+			owner: *owner.as_eth(),
+			spender: *spender.as_eth(),
+			value: amount.into(),
+		});
+		<PalletCommon<T>>::deposit_event(CommonEvent::Approved(
+			collection.id,
+			TokenId(0),
+			owner.clone(),
+			spender.clone(),
+			amount,
+		));
+	}
+
+	pub fn set_allowance(
+		collection: &FungibleHandle<T>,
+		owner: &T::CrossAccountId,
+		spender: &T::CrossAccountId,
+		amount: u128,
+	) -> DispatchResult {
+		if collection.access == AccessMode::WhiteList {
+			collection.check_whitelist(&owner)?;
+			collection.check_whitelist(&spender)?;
+		}
+
+		if <Balance<T>>::get((collection.id, owner.as_sub())) < amount {
+			ensure!(
+				collection.ignores_owned_amount(owner)?,
+				<CommonError<T>>::CantApproveMoreThanOwned
+			);
+		}
+
+		// =========
+
+		Self::set_allowance_unchecked(collection, owner, spender, amount);
+		Ok(())
+	}
+
+	pub fn transfer_from(
+		collection: &FungibleHandle<T>,
+		spender: &T::CrossAccountId,
+		from: &T::CrossAccountId,
+		to: &T::CrossAccountId,
+		amount: u128,
+	) -> DispatchResult {
+		if spender == from {
+			return Self::transfer(collection, from, to, amount);
+		}
+		if collection.access == AccessMode::WhiteList {
+			// `from`, `to` checked in [`transfer`]
+			collection.check_whitelist(spender)?;
+		}
+
+		let allowance = <Allowance<T>>::get((collection.id, from.as_sub(), spender.as_sub()))
+			.checked_sub(amount);
+		if allowance.is_none() {
+			ensure!(
+				collection.ignores_allowance(spender)?,
+				<CommonError<T>>::TokenValueNotEnough
+			);
+		}
+
+		// =========
+
+		Self::transfer(collection, from, to, amount)?;
+		if let Some(allowance) = allowance {
+			Self::set_allowance_unchecked(collection, from, spender, allowance);
+		}
+		Ok(())
+	}
+
+	/// Delegated to `create_multiple_items`
+	pub fn create_item(
+		collection: &FungibleHandle<T>,
+		sender: &T::CrossAccountId,
+		data: CreateItemData<T>,
+	) -> DispatchResult {
+		Self::create_multiple_items(collection, sender, vec![data])
+	}
+}

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--- /dev/null
+++ b/pallets/fungible/src/weights.rs
@@ -0,0 +1,31 @@
+#![cfg_attr(rustfmt, rustfmt_skip)]
+#![allow(unused_parens)]
+#![allow(unused_imports)]
+
+use frame_support::{traits::Get, weights::{Weight, constants::RocksDbWeight}};
+use sp_std::marker::PhantomData;
+
+pub trait WeightInfo {
+	fn create_item() -> Weight;
+	fn burn_item() -> Weight;
+	fn transfer() -> Weight;
+	fn approve() -> Weight;
+	fn transfer_from() -> Weight;
+}
+
+pub struct SubstrateWeight<T>(PhantomData<T>);
+impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
+    fn create_item() -> Weight {0}
+	fn burn_item() -> Weight {0}
+	fn transfer() -> Weight {0}
+	fn approve() -> Weight {0}
+	fn transfer_from() -> Weight {0}
+}
+
+impl WeightInfo for () {
+    fn create_item() -> Weight {0}
+	fn burn_item() -> Weight {0}
+	fn transfer() -> Weight {0}
+	fn approve() -> Weight {0}
+	fn transfer_from() -> Weight {0}
+}