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Non-fungible token traits (#8993)

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* Non-fungible token traits

* Docs

* Fixes

* Implement non-fungible trait for Uniques

* Update frame/uniques/src/impl_nonfungibles.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update frame/uniques/src/impl_nonfungibles.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Gavin Wood
2021-06-03 13:20:34 +02:00
committed by GitHub
parent ccb4e6a551
commit bf1ea96c66
10 changed files with 663 additions and 62 deletions
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substrate/frame/uniques/src/lib.rs
+14 -60
View File
@@ -36,6 +36,8 @@ pub mod mock;
mod tests;
mod types;
mod functions;
mod impl_nonfungibles;
pub use types::*;
use sp_std::prelude::*;
@@ -448,32 +450,10 @@ pub mod pallet {
let origin = ensure_signed(origin)?;
let owner = T::Lookup::lookup(owner)?;
ensure!(!Asset::<T, I>::contains_key(class, instance), Error::<T, I>::AlreadyExists);
Class::<T, I>::try_mutate(&class, |maybe_class_details| -> DispatchResult {
let class_details = maybe_class_details.as_mut().ok_or(Error::<T, I>::Unknown)?;
Self::do_mint(class, instance, owner, |class_details| {
ensure!(class_details.issuer == origin, Error::<T, I>::NoPermission);
let instances = class_details.instances.checked_add(1)
.ok_or(ArithmeticError::Overflow)?;
class_details.instances = instances;
let deposit = match class_details.free_holding {
true => Zero::zero(),
false => T::InstanceDeposit::get(),
};
T::Currency::reserve(&class_details.owner, deposit)?;
class_details.total_deposit += deposit;
let owner = owner.clone();
Account::<T, I>::insert((&owner, &class, &instance), ());
let details = InstanceDetails { owner, approved: None, is_frozen: false, deposit};
Asset::<T, I>::insert(&class, &instance, details);
Ok(())
})?;
Self::deposit_event(Event::Issued(class, instance, owner));
Ok(())
})
}
/// Destroy a single asset instance.
@@ -499,27 +479,12 @@ pub mod pallet {
let origin = ensure_signed(origin)?;
let check_owner = check_owner.map(T::Lookup::lookup).transpose()?;
let owner = Class::<T, I>::try_mutate(&class, |maybe_class_details| -> Result<T::AccountId, DispatchError> {
let class_details = maybe_class_details.as_mut().ok_or(Error::<T, I>::Unknown)?;
let details = Asset::<T, I>::get(&class, &instance)
.ok_or(Error::<T, I>::Unknown)?;
Self::do_burn(class, instance, |class_details, details| {
let is_permitted = class_details.admin == origin || details.owner == origin;
ensure!(is_permitted, Error::<T, I>::NoPermission);
ensure!(check_owner.map_or(true, |o| o == details.owner), Error::<T, I>::WrongOwner);
// Return the deposit.
T::Currency::unreserve(&class_details.owner, details.deposit);
class_details.total_deposit.saturating_reduce(details.deposit);
class_details.instances.saturating_dec();
Ok(details.owner)
})?;
Asset::<T, I>::remove(&class, &instance);
Account::<T, I>::remove((&owner, &class, &instance));
Self::deposit_event(Event::Burned(class, instance, owner));
Ok(())
Ok(())
})
}
/// Move an asset from the sender account to another.
@@ -547,24 +512,13 @@ pub mod pallet {
let origin = ensure_signed(origin)?;
let dest = T::Lookup::lookup(dest)?;
let class_details = Class::<T, I>::get(&class).ok_or(Error::<T, I>::Unknown)?;
ensure!(!class_details.is_frozen, Error::<T, I>::Frozen);
let mut details = Asset::<T, I>::get(&class, &instance).ok_or(Error::<T, I>::Unknown)?;
ensure!(!details.is_frozen, Error::<T, I>::Frozen);
if details.owner != origin && class_details.admin != origin {
let approved = details.approved.take().map_or(false, |i| i == origin);
ensure!(approved, Error::<T, I>::NoPermission);
}
Account::<T, I>::remove((&details.owner, &class, &instance));
Account::<T, I>::insert((&dest, &class, &instance), ());
details.owner = dest;
Asset::<T, I>::insert(&class, &instance, &details);
Self::deposit_event(Event::Transferred(class, instance, origin, details.owner));
Ok(())
Self::do_transfer(class, instance, dest, |class_details, details| {
if details.owner != origin && class_details.admin != origin {
let approved = details.approved.take().map_or(false, |i| i == origin);
ensure!(approved, Error::<T, I>::NoPermission);
}
Ok(())
})
}
/// Reevaluate the deposits on some assets.