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Implement a CountedStorageMap (#9125)

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* initial impl

* expose in pallet_prelude

* temp test

* Apply suggestions from code review

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
Co-authored-by: Xiliang Chen <xlchen1291@gmail.com>

* implement with macro help.

* test for macro generation

* add iterable functions, some test and fixes

* fix merge

* doc

* Update frame/support/src/storage/types/counted_map.rs

Co-authored-by: Zeke Mostov <32168567+emostov@users.noreply.github.com>

* fix merge

* fmt

* fix spelling

* improve on removal

* fix partial storage info

* fmt

* add license

* suggested renames

* fix typo

* fix test

* fmt

* fix ui tests

* clearer doc

* better doc

* add metadata test

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
Co-authored-by: Xiliang Chen <xlchen1291@gmail.com>
Co-authored-by: Zeke Mostov <32168567+emostov@users.noreply.github.com>
This commit is contained in:
Guillaume Thiolliere
2021-09-16 15:20:29 +02:00
committed by GitHub
parent 49b6dfd2e5
commit 65e5fa3aa3
22 changed files with 1721 additions and 204 deletions
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substrate/frame/support/src/lib.rs
+16 -5
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@@ -1293,8 +1293,8 @@ pub mod pallet_prelude {
storage::{
bounded_vec::BoundedVec,
types::{
Key as NMapKey, OptionQuery, StorageDoubleMap, StorageMap, StorageNMap,
StorageValue, ValueQuery,
CountedStorageMap, Key as NMapKey, OptionQuery, StorageDoubleMap, StorageMap,
StorageNMap, StorageValue, ValueQuery,
},
},
traits::{
@@ -1673,6 +1673,8 @@ pub mod pallet_prelude {
/// * [`pallet_prelude::StorageValue`] expect `Value` and optionally `QueryKind` and `OnEmpty`,
/// * [`pallet_prelude::StorageMap`] expect `Hasher`, `Key`, `Value` and optionally `QueryKind`
/// and `OnEmpty`,
/// * [`pallet_prelude::CountedStorageMap`] expect `Hasher`, `Key`, `Value` and optionally
/// `QueryKind` and `OnEmpty`,
/// * [`pallet_prelude::StorageDoubleMap`] expect `Hasher1`, `Key1`, `Hasher2`, `Key2`, `Value`
/// and optionally `QueryKind` and `OnEmpty`.
///
@@ -1684,13 +1686,16 @@ pub mod pallet_prelude {
/// E.g. if runtime names the pallet "MyExample" then the storage `type Foo<T> = ...` use the
/// prefix: `Twox128(b"MyExample") ++ Twox128(b"Foo")`.
///
/// The optional attribute `#[pallet::storage_prefix = "$custom_name"]` allows to define a
/// specific name to use for the prefix.
/// For the `CountedStorageMap` variant, the Prefix also implements
/// `CountedStorageMapInstance`. It associate a `CounterPrefix`, which is implemented same as
/// above, but the storage prefix is prepend with `"CounterFor"`.
/// E.g. if runtime names the pallet "MyExample" then the storage
/// `type Foo<T> = CountedStorageaMap<...>` will store its counter at the prefix:
/// `Twox128(b"MyExample") ++ Twox128(b"CounterForFoo")`.
///
/// E.g:
/// ```ignore
/// #[pallet::storage]
/// #[pallet::storage_prefix = "OtherName"]
/// pub(super) type MyStorage<T> = StorageMap<Hasher = Blake2_128Concat, Key = u32, Value = u32>;
/// ```
/// In this case the final prefix used by the map is
@@ -1699,9 +1704,13 @@ pub mod pallet_prelude {
/// The optional attribute `#[pallet::getter(fn $my_getter_fn_name)]` allows to define a
/// getter function on `Pallet`.
///
/// The optional attribute `#[pallet::storage_prefix = "SomeName"]` allow to define the storage
/// prefix to use, see how `Prefix` generic is implemented above.
///
/// E.g:
/// ```ignore
/// #[pallet::storage]
/// #[pallet::storage_prefix = "foo"]
/// #[pallet::getter(fn my_storage)]
/// pub(super) type MyStorage<T> = StorageMap<Hasher = Blake2_128Concat, Key = u32, Value = u32>;
/// ```
@@ -1738,6 +1747,8 @@ pub mod pallet_prelude {
/// `_GeneratedPrefixForStorage$NameOfStorage`, and implements
/// [`StorageInstance`](traits::StorageInstance) on it using the pallet and storage name. It
/// then uses it as the first generic of the aliased type.
/// For `CountedStorageMap`, `CountedStorageMapInstance` is implemented, and another similar
/// struct is generated.
///
/// For named generic, the macro will reorder the generics, and remove the names.
///