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Implement InspectEnumerable for Uniques (#9117)

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* implement InspectEnumerable in pallet_uniques

* use `iter_keys` and `iter_key_prefix`

* return an iterator instead of constructing a vec

* update comments

* additional warning about storage reads

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Alexander Popiak
2021-07-01 23:34:17 +02:00
committed by GitHub
parent ae3c3045df
commit c30ece2bd8
3 changed files with 45 additions and 19 deletions
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substrate/frame/uniques/src/impl_nonfungibles.rs
+31 -1
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@@ -19,7 +19,7 @@
use super::*;
use sp_std::convert::TryFrom;
use frame_support::traits::tokens::nonfungibles::{Inspect, Mutate, Transfer};
use frame_support::traits::tokens::nonfungibles::{Inspect, InspectEnumerable, Mutate, Transfer};
use frame_support::BoundedSlice;
use sp_runtime::DispatchResult;
@@ -106,3 +106,33 @@ impl<T: Config<I>, I: 'static> Transfer<T::AccountId> for Pallet<T, I> {
Self::do_transfer(class.clone(), instance.clone(), destination.clone(), |_, _| Ok(()))
}
}
impl<T: Config<I>, I: 'static> InspectEnumerable<T::AccountId> for Pallet<T, I> {
/// Returns an iterator of the asset classes in existence.
///
/// NOTE: iterating this list invokes a storage read per item.
fn classes() -> Box<dyn Iterator<Item = Self::ClassId>> {
Box::new(ClassMetadataOf::<T, I>::iter_keys())
}
/// Returns an iterator of the instances of an asset `class` in existence.
///
/// NOTE: iterating this list invokes a storage read per item.
fn instances(class: &Self::ClassId) -> Box<dyn Iterator<Item = Self::InstanceId>> {
Box::new(InstanceMetadataOf::<T, I>::iter_key_prefix(class))
}
/// Returns an iterator of the asset instances of all classes owned by `who`.
///
/// NOTE: iterating this list invokes a storage read per item.
fn owned(who: &T::AccountId) -> Box<dyn Iterator<Item = (Self::ClassId, Self::InstanceId)>> {
Box::new(Account::<T, I>::iter_key_prefix((who,)))
}
/// Returns an iterator of the asset instances of `class` owned by `who`.
///
/// NOTE: iterating this list invokes a storage read per item.
fn owned_in_class(class: &Self::ClassId, who: &T::AccountId) -> Box<dyn Iterator<Item = Self::InstanceId>> {
Box::new(Account::<T, I>::iter_key_prefix((who, class)))
}
}