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| Original file line number | Diff line number | Diff line change |
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| // KILT Blockchain – https://botlabs.org | ||
| // Copyright (C) 2019-2024 BOTLabs GmbH | ||
|
|
||
| // The KILT Blockchain 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. | ||
|
|
||
| // The KILT Blockchain 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 this program. If not, see <https://www.gnu.org/licenses/>. | ||
|
|
||
| // If you feel like getting in touch with us, you can do so at [email protected] | ||
|
|
||
| use frame_support::traits::{ | ||
| fungible::{Dust, Inspect, InspectHold, MutateHold, Unbalanced, UnbalancedHold}, | ||
| tokens::{Fortitude, Precision, Preservation, Provenance, WithdrawConsequence}, | ||
| }; | ||
| use kilt_support::Deposit; | ||
| use parity_scale_codec::{Decode, Encode, MaxEncodedLen}; | ||
| use scale_info::TypeInfo; | ||
| use sp_runtime::{ | ||
| traits::{CheckedSub, Zero}, | ||
| DispatchError, DispatchResult, | ||
| }; | ||
|
|
||
| use crate::{deposit::DepositEntry, Config, DepositKeyOf, Error, HoldReason, Pallet, SystemDeposits}; | ||
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|
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| const LOG_TARGET: &str = "runtime::pallet_deposit_storage::mutate-hold"; | ||
|
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||
| #[cfg(test)] | ||
| mod tests; | ||
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|
||
| #[cfg(any(test, feature = "try-runtime"))] | ||
| pub(super) mod try_state; | ||
|
|
||
| // This trait is implemented by forwarding everything to the `Currency` | ||
| // implementation. | ||
| impl<T> Inspect<T::AccountId> for Pallet<T> | ||
| where | ||
| T: Config, | ||
| { | ||
| type Balance = <T::Currency as Inspect<T::AccountId>>::Balance; | ||
|
|
||
| fn total_issuance() -> Self::Balance { | ||
| <T::Currency as Inspect<T::AccountId>>::total_issuance() | ||
| } | ||
|
|
||
| fn minimum_balance() -> Self::Balance { | ||
| <T::Currency as Inspect<T::AccountId>>::minimum_balance() | ||
| } | ||
|
|
||
| fn total_balance(who: &T::AccountId) -> Self::Balance { | ||
| <T::Currency as Inspect<T::AccountId>>::total_balance(who) | ||
| } | ||
|
|
||
| fn balance(who: &T::AccountId) -> Self::Balance { | ||
| <T::Currency as Inspect<T::AccountId>>::balance(who) | ||
| } | ||
|
|
||
| fn reducible_balance(who: &T::AccountId, preservation: Preservation, force: Fortitude) -> Self::Balance { | ||
| <T::Currency as Inspect<T::AccountId>>::reducible_balance(who, preservation, force) | ||
| } | ||
|
|
||
| fn can_deposit( | ||
| who: &T::AccountId, | ||
| amount: Self::Balance, | ||
| provenance: Provenance, | ||
| ) -> frame_support::traits::tokens::DepositConsequence { | ||
| <T::Currency as Inspect<T::AccountId>>::can_deposit(who, amount, provenance) | ||
| } | ||
|
|
||
| fn can_withdraw(who: &T::AccountId, amount: Self::Balance) -> WithdrawConsequence<Self::Balance> { | ||
| <T::Currency as Inspect<T::AccountId>>::can_withdraw(who, amount) | ||
| } | ||
| } | ||
|
|
||
| /// The `HoldReason` consumers must use in order to rely on this pallet's | ||
| /// implementation of `MutateHold`. | ||
| #[derive(Encode, Decode, MaxEncodedLen, TypeInfo, Clone, Copy, Debug, Default)] | ||
| pub struct PalletDepositStorageReason<Namespace, Key> { | ||
| pub(crate) namespace: Namespace, | ||
| pub(crate) key: Key, | ||
| } | ||
|
|
||
| impl<Namespace, Key> From<PalletDepositStorageReason<Namespace, Key>> for HoldReason { | ||
| fn from(_value: PalletDepositStorageReason<Namespace, Key>) -> Self { | ||
| // All the deposits ever taken like this will count towards the same hold | ||
| // reason. | ||
| Self::FungibleImpl | ||
| } | ||
| } | ||
|
|
||
| impl<T> InspectHold<T::AccountId> for Pallet<T> | ||
| where | ||
| T: Config, | ||
| { | ||
| type Reason = PalletDepositStorageReason<T::Namespace, DepositKeyOf<T>>; | ||
|
|
||
| fn total_balance_on_hold(who: &T::AccountId) -> Self::Balance { | ||
| <T::Currency as InspectHold<T::AccountId>>::total_balance_on_hold(who) | ||
| } | ||
|
|
||
| // We return the balance of hold of a specific (namespace, key), which prevents | ||
| // mistakes since everything in the end is converted to `HoldReason`. | ||
| fn balance_on_hold(reason: &Self::Reason, who: &T::AccountId) -> Self::Balance { | ||
| let Some(deposit_entry) = SystemDeposits::<T>::get(&reason.namespace, &reason.key) else { | ||
| return Zero::zero(); | ||
| }; | ||
| if deposit_entry.deposit.owner == *who { | ||
| deposit_entry.deposit.amount | ||
| } else { | ||
| Zero::zero() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // This trait is implemented by forwarding everything to the `Currency` | ||
| // implementation. | ||
| impl<T> Unbalanced<T::AccountId> for Pallet<T> | ||
| where | ||
| T: Config, | ||
| { | ||
| fn handle_dust(dust: Dust<T::AccountId, Self>) { | ||
| <T::Currency as Unbalanced<T::AccountId>>::handle_dust(Dust(dust.0)); | ||
| } | ||
|
|
||
| fn write_balance(who: &T::AccountId, amount: Self::Balance) -> Result<Option<Self::Balance>, DispatchError> { | ||
| <T::Currency as Unbalanced<T::AccountId>>::write_balance(who, amount) | ||
| } | ||
|
|
||
| fn set_total_issuance(amount: Self::Balance) { | ||
| <T::Currency as Unbalanced<T::AccountId>>::set_total_issuance(amount); | ||
| } | ||
| } | ||
|
|
||
| impl<T> UnbalancedHold<T::AccountId> for Pallet<T> | ||
| where | ||
| T: Config, | ||
| { | ||
| /// This function gets called inside all invocations of `hold`, `release`, | ||
| /// and `release_all`. The value of `amount` is always the final amount that | ||
| /// should be kept on hold, meaning that a `release_all` will result in a | ||
| /// value of `0`. An hold increase from `1` to `2` will imply a value of | ||
| /// `amount` of `2`, i.e., the total amount held at the end of the | ||
| /// evaluation. Similarly, a decrease from `3` to `1` will imply a `amount` | ||
| /// value of `1`. | ||
| fn set_balance_on_hold(reason: &Self::Reason, who: &T::AccountId, amount: Self::Balance) -> DispatchResult { | ||
| let runtime_reason = T::RuntimeHoldReason::from(reason.clone().into()); | ||
| SystemDeposits::<T>::try_mutate_exists(&reason.namespace, &reason.key, |maybe_existing_deposit_entry| { | ||
| match maybe_existing_deposit_entry { | ||
| // If this is the first registered deposit for this reason, create a new storage entry. | ||
| None => { | ||
| if amount > Zero::zero() { | ||
| // Increase the held amount for the final runtime hold reason by `amount`. | ||
| <T::Currency as UnbalancedHold<T::AccountId>>::increase_balance_on_hold( | ||
| &runtime_reason, | ||
| who, | ||
| amount, | ||
| Precision::Exact, | ||
| )?; | ||
| *maybe_existing_deposit_entry = Some(DepositEntry { | ||
| deposit: Deposit { | ||
| amount, | ||
| owner: who.clone(), | ||
| }, | ||
| reason: runtime_reason, | ||
| }) | ||
| } | ||
| Ok(()) | ||
| } | ||
| Some(existing_deposit_entry) => { | ||
| // The pallet assumes each (namespace, key) points to a unique deposit, so the | ||
| // same combination cannot be used for a different account. | ||
| if existing_deposit_entry.deposit.owner != *who { | ||
| return Err(DispatchError::from(Error::<T>::DepositExisting)); | ||
| } | ||
| if amount.is_zero() { | ||
| // If trying to remove all holds for this reason (`amount` == 0), decrease the | ||
| // held amount for the final runtime hold reason by the amount that was held by | ||
| // this reason. | ||
| <T::Currency as UnbalancedHold<T::AccountId>>::decrease_balance_on_hold( | ||
| &runtime_reason, | ||
| who, | ||
| existing_deposit_entry.deposit.amount, | ||
| Precision::Exact, | ||
| )?; | ||
| // Since we're setting the held amount to `0`, remove the storage entry. | ||
| *maybe_existing_deposit_entry = None; | ||
| // We're trying to update (i.e., not creating, not deleting) | ||
| // the held amount for this hold reason. | ||
| } else { | ||
| // If trying to increase the amount held, increase the held amount for the final | ||
| // runtime hold reason by the (amount - stored amount) difference. | ||
| if amount >= existing_deposit_entry.deposit.amount { | ||
| let amount_to_hold = amount | ||
| .checked_sub(&existing_deposit_entry.deposit.amount) | ||
| .ok_or_else(|| { | ||
| log::error!(target: LOG_TARGET, "Failed to evaluate {:?} - {:?}", amount, existing_deposit_entry.deposit.amount); | ||
| Error::<T>::Internal | ||
| })?; | ||
| <T::Currency as UnbalancedHold<T::AccountId>>::increase_balance_on_hold( | ||
| &runtime_reason, | ||
| who, | ||
| amount_to_hold, | ||
| Precision::Exact, | ||
| )?; | ||
| // Else, decrease the held amount for the final runtime | ||
| // hold reason by the (stored amount - amount) | ||
| // difference. | ||
| } else { | ||
| let amount_to_release = existing_deposit_entry | ||
| .deposit | ||
| .amount | ||
| .checked_sub(&amount) | ||
| .ok_or_else(|| { | ||
| log::error!(target: LOG_TARGET, "Failed to evaluate {:?} - {:?}", existing_deposit_entry.deposit.amount, amount); | ||
| Error::<T>::Internal | ||
| })?; | ||
| <T::Currency as UnbalancedHold<T::AccountId>>::decrease_balance_on_hold( | ||
| &runtime_reason, | ||
| who, | ||
| amount_to_release, | ||
| Precision::Exact, | ||
| )?; | ||
| } | ||
| // In either case, update the storage entry with the specified amount. | ||
| existing_deposit_entry.deposit.amount = amount; | ||
| } | ||
| Ok(()) | ||
| } | ||
| } | ||
| })?; | ||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| impl<T> MutateHold<T::AccountId> for Pallet<T> where T: Config {} |
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