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generate_storage_alias: Rewrite as proc macro attribute (#11387)

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* generate_storage_alias: Rewrite as proc macro attribute

This rewrites the `generate_storage_alias!` declarative macro as proc-macro attribute. While doing
this the name is changed to `storage_alias`. The prefix can now also be the name of a pallet. This
makes storage aliases work in migrations for all kind of chains and not just for the ones that use
predefined prefixes.

* Fix compilation and FMT

* Moare fixes

* 🤦

* ......

* Rework the syntax and support instancing

* FMT

* Prefix variants with `Storage`

* Make it compile

* Fix where clause on rust stable
This commit is contained in:
Bastian Köcher
2022-05-18 00:45:56 +02:00
committed by GitHub
parent 27f08fec3a
commit 74428fa8ac
21 changed files with 884 additions and 379 deletions
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substrate/frame/bags-list/src/list/tests.rs
+4 -6
View File
@@ -368,12 +368,10 @@ mod list {
assert_eq!(crate::ListNodes::<Runtime>::count(), 4);
// we do some wacky stuff here to get access to the counter, since it is (reasonably)
// not exposed as mutable in any sense.
frame_support::generate_storage_alias!(
BagsList,
CounterForListNodes
=> Value<u32, frame_support::pallet_prelude::ValueQuery>
);
CounterForListNodes::mutate(|counter| *counter += 1);
#[frame_support::storage_alias]
type CounterForListNodes<T: Config> =
StorageValue<crate::Pallet<T>, u32, frame_support::pallet_prelude::ValueQuery>;
CounterForListNodes::<Runtime>::mutate(|counter| *counter += 1);
assert_eq!(crate::ListNodes::<Runtime>::count(), 5);
assert_eq!(List::<Runtime>::sanity_check(), Err("iter_count != stored_count"));
substrate/frame/bags-list/src/migrations.rs
+3 -2
View File
@@ -30,11 +30,12 @@ impl<T: crate::Config> OnRuntimeUpgrade for CheckCounterPrefix<T> {
fn pre_upgrade() -> Result<(), &'static str> {
use frame_support::ensure;
// The old explicit storage item.
frame_support::generate_storage_alias!(BagsList, CounterForListNodes => Value<u32>);
#[frame_support::storage_alias]
type CounterForListNodes<T: crate::Config> = StorageValue<crate::Pallet<T>, u32>;
// ensure that a value exists in the counter struct.
ensure!(
crate::ListNodes::<T>::count() == CounterForListNodes::get().unwrap(),
crate::ListNodes::<T>::count() == CounterForListNodes::<T>::get().unwrap(),
"wrong list node counter"
);