Deprecate Currency; introduce holds and freezing into fungible traits (#12951)

* First reworking of fungibles API

* New API and docs

* More fungible::* API improvements

* New ref-counting logic for old API

* Missing files

* Fixes

* Use the new transfer logic

* Use fungibles for the dispatchables

* Use shelve/restore names

* Locking works with total balance.

* repotting and removal

* Separate Holds from Reserves

* Introduce freezes

* Missing files

* Tests for freezing

* Fix hold+freeze combo

* More tests

* Fee-free dispatchable for upgrading accounts

* Benchmarks and a few fixes

* Another test

* Docs and refactor to avoid blanket impls

* Repot

* Fit out ItemOf fully

* Add events to Balanced traits

* Introduced events into Hold traits

* Fix Assets pallet tests

* Assets benchmarks pass

* Missing files and fixes

* Fixes

* Fixes

* Benchmarks fixes

* Fix balance benchmarks

* Formatting

* Expose fungible sub modules

* Move NIS to fungible API

* Fix broken impl and add test

* Fix tests

* API for `transfer_and_hold`

* Use composite APIs

* Formatting

* Upgraded event

* Fixes

* Fixes

* Fixes

* Fixes

* Repot tests and some fixed

* Fix some bits

* Fix dust tests

* Rename `set_balance`

- `Balances::set_balance` becomes `Balances::force_set_balance`
- `Unbalanced::set_balance` becomes `Unbalances::write_balance`

* becomes

* Move dust handling to fungibles API

* Formatting

* Fixes and more refactoring

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes

* Use reducible_balance for better correctness on fees

* Reducing hold to zero should remove entry.

* Add test

* Docs

* Update frame/support/src/traits/tokens/fungibles/hold.rs

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>

* Update frame/support/src/traits/tokens/fungibles/regular.rs

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>

* Update frame/support/src/traits/tokens/fungible/hold.rs

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>

* Update frame/support/src/traits/tokens/fungible/regular.rs

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>

* Docs

* Docs

* Docs

* Fix NIS benchmarks

* Doc comment

* Remove post_mutation

* Fix some tests

* Fix some grumbles

* Enumify bool args to fungible(s) functions

* Fix up assets and balances

* Formatting

* Fix contracts

* Fix tests & benchmarks build

* Typify minted boolean arg

* Typify on_hold boolean arg; renames

* Fix numerous tests

* Fix dependency issue

* Privatize dangerous API mutate_account

* Fix contracts (@alext - please check this commit)

* Remove println

* Fix tests for contracts

* Fix broken rename

* Fix broken rename

* Fix broken rename

* Docs

* Update frame/support/src/traits/tokens/fungible/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* remove from_ref_time

* Update frame/executive/src/lib.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/executive/src/lib.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Reenable test

* Update frame/support/src/traits/tokens/fungibles/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungible/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungible/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungible/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/currency.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/lottery/src/tests.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungible/mod.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungible/regular.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungibles/freeze.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungible/regular.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungibles/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungibles/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Update frame/support/src/traits/tokens/fungibles/hold.rs

Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>

* Rename UnwantedRemoval to UnwantedAccountRemoval

* Docs

* Formatting

* Update frame/balances/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update primitives/runtime/src/lib.rs

Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>

* handle_raw_dust oes nothing

* Formatting

* Fixes

* Grumble

* Fixes

* Add test

* Add test

* Tests for reducible_balance

* Fixes

* Fix Salary

* Fixes

* Disable broken test

* Disable nicely

* Fixes

* Fixes

* Fixes

* Rename some events

* Fix nomination pools breakage

* Add compatibility stub for transfer tx

* Reinstate a safely compatible version of Balances set_balance

* Fixes

* Grumble

* Update frame/nis/src/lib.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_balances

* disable flakey tests

* Update frame/balances/src/lib.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Grumbles

* Grumble

---------

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>
Co-authored-by: Alexander Theißen <alex.theissen@me.com>
Co-authored-by: Anthony Alaribe <anthonyalaribe@gmail.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: command-bot <>

substrate/frame/contracts/src/exec.rs

@@ -25,7 +25,10 @@ use frame_support::{
 	crypto::ecdsa::ECDSAExt,
 	dispatch::{DispatchError, DispatchResult, DispatchResultWithPostInfo, Dispatchable},
 	storage::{with_transaction, TransactionOutcome},
-	traits::{Contains, Currency, ExistenceRequirement, OriginTrait, Randomness, Time},
+	traits::{
+		tokens::{Fortitude::Polite, Preservation::Expendable},
+		Contains, Currency, ExistenceRequirement, OriginTrait, Randomness, Time,
+	},
 	weights::Weight,
 	Blake2_128Concat, BoundedVec, StorageHasher,
 };
@@ -1198,7 +1201,7 @@ where
 		T::Currency::transfer(
 			&frame.account_id,
 			beneficiary,
-			T::Currency::reducible_balance(&frame.account_id, false),
+			T::Currency::reducible_balance(&frame.account_id, Expendable, Polite),
 			ExistenceRequirement::AllowDeath,
 		)?;
 		info.queue_trie_for_deletion()?;
@@ -2751,8 +2754,10 @@ mod tests {
 				RuntimeCall::System(SysCall::remark_with_event { remark: b"Hello".to_vec() });
 
 			// transfers are disallowed by the `TestFiler` (see below)
-			let forbidden_call =
-				RuntimeCall::Balances(BalanceCall::transfer { dest: CHARLIE, value: 22 });
+			let forbidden_call = RuntimeCall::Balances(BalanceCall::transfer_allow_death {
+				dest: CHARLIE,
+				value: 22,
+			});
 
 			// simple cases: direct call
 			assert_err!(
@@ -2772,7 +2777,7 @@ mod tests {
 		});
 
 		TestFilter::set_filter(|call| match call {
-			RuntimeCall::Balances(pallet_balances::Call::transfer { .. }) => false,
+			RuntimeCall::Balances(pallet_balances::Call::transfer_allow_death { .. }) => false,
 			_ => true,
 		});