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UnionOf types for merged fungible and fungibles implementations (#2033)

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Introduces `UnionOf` types, crafted to merge `fungible` and `fungibles`
implementations or two `fungibles` implementations into a single type
implementing `fungibles`.

This also addresses an issue where `ItemOf` initiates a double drop for
an imbalance type, leading to inaccurate total issuance accounting.

Find the application of these types in this PR -
[link](https://github.com/paritytech/polkadot-sdk/pull/2031), places in
code -
[1](https://github.com/paritytech/polkadot-sdk/blob/4ec7496fa2632385b08fae860fcf28a523a7b5de/cumulus/parachains/runtimes/assets/asset-hub-kusama/src/lib.rs#L327),
[2](https://github.com/paritytech/polkadot-sdk/blob/4ec7496fa2632385b08fae860fcf28a523a7b5de/cumulus/parachains/runtimes/assets/asset-hub-kusama/src/lib.rs#L343).

---------

Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: joepetrowski <joe@parity.io>
This commit is contained in:
Muharem
2023-12-19 13:51:05 +01:00
committed by GitHub
parent 81156d03ce
commit 0b74812ce8
15 changed files with 2353 additions and 37 deletions
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substrate/frame/support/src/traits/misc.rs
+13 -4
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@@ -1170,17 +1170,26 @@ impl<Hash> PreimageRecipient<Hash> for () {
fn unnote_preimage(_: &Hash) {}
}
/// Trait for creating an asset account with a deposit taken from a designated depositor specified
/// by the client.
/// Trait for touching/creating an asset account with a deposit taken from a designated depositor
/// specified by the client.
///
/// Ensures that transfers to the touched account will succeed without being denied by the account
/// creation requirements. For example, it is useful for the account creation of non-sufficient
/// assets when its system account may not have the free consumer reference required for it. If
/// there is no risk of failing to meet those requirements, the touch operation can be a no-op, as
/// is common for native assets.
pub trait AccountTouch<AssetId, AccountId> {
/// The type for currency units of the deposit.
type Balance;
/// The deposit amount of a native currency required for creating an account of the `asset`.
/// The deposit amount of a native currency required for touching an account of the `asset`.
fn deposit_required(asset: AssetId) -> Self::Balance;
/// Check if an account for a given asset should be touched to meet the existence requirements.
fn should_touch(asset: AssetId, who: &AccountId) -> bool;
/// Create an account for `who` of the `asset` with a deposit taken from the `depositor`.
fn touch(asset: AssetId, who: AccountId, depositor: AccountId) -> DispatchResult;
fn touch(asset: AssetId, who: &AccountId, depositor: &AccountId) -> DispatchResult;
}
#[cfg(test)]