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Refactor StorageInstance trait to be usable more easily (#7659)

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* refactor StorageInstance to be usable without macros

* better description

* update types  doc

* Update frame/support/src/traits.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
This commit is contained in:
Guillaume Thiolliere
2020-12-03 11:51:08 +01:00
committed by GitHub
parent b149b1fdc0
commit 7e83b7a7f2
4 changed files with 20 additions and 20 deletions
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substrate/frame/support/src/traits.rs
+11 -5
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@@ -1731,13 +1731,19 @@ pub trait Instance: 'static {
const PREFIX: &'static str;
}
/// An instance of a storage.
/// An instance of a storage in a pallet.
///
/// It is required the the couple `(PalletInfo::name<Pallet>(), STORAGE_PREFIX)` is unique.
/// Any storage with same couple will collide.
/// Define an instance for an individual storage inside a pallet.
/// The pallet prefix is used to isolate the storage between pallets, and the storage prefix is
/// used to isolate storages inside a pallet.
///
/// NOTE: These information can be used to define storages in pallet such as a `StorageMap` which
/// can use keys after `twox_128(pallet_prefix())++twox_128(STORAGE_PREFIX)`
pub trait StorageInstance {
type Pallet: 'static;
type PalletInfo: PalletInfo;
/// Prefix of a pallet to isolate it from other pallets.
fn pallet_prefix() -> &'static str;
/// Prefix given to a storage to isolate from other storages in the pallet.
const STORAGE_PREFIX: &'static str;
}