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pallet macro: allow to declare individual unbounded storage for those who cannot go into PoV (#9670)

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* allow unbounded individual storage

* better doc

* fix UI tests

* update doc

* Update frame/support/procedural/src/pallet/parse/storage.rs

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

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
This commit is contained in:
Guillaume Thiolliere
2021-09-27 10:25:24 +02:00
committed by GitHub
parent d565382b50
commit 1ebcbe1c34
7 changed files with 106 additions and 44 deletions
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substrate/frame/support/src/lib.rs
+9 -2
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@@ -1411,15 +1411,17 @@ pub mod pallet_prelude {
/// `<Pallet as Store>::Foo`.
///
/// To generate the full storage info (used for PoV calculation) use the attribute
/// `#[pallet::set_storage_max_encoded_len]`, e.g.:
/// `#[pallet::generate_storage_info]`, e.g.:
/// ```ignore
/// #[pallet::pallet]
/// #[pallet::set_storage_max_encoded_len]
/// #[pallet::generate_storage_info]
/// pub struct Pallet<T>(_);
/// ```
///
/// This require all storage to implement the trait [`traits::StorageInfoTrait`], thus all keys
/// and value types must bound [`pallet_prelude::MaxEncodedLen`].
/// Some individual storage can opt-out from this constraint by using `#[pallet::unbounded]`,
/// see `#[pallet::storage]` documentation.
///
/// As the macro implements [`traits::GetStorageVersion`], the current storage version needs to
/// be communicated to the macro. This can be done by using the `storage_version` attribute:
@@ -1721,6 +1723,11 @@ pub mod pallet_prelude {
/// pub(super) type MyStorage<T> = StorageMap<_, Blake2_128Concat, u32, u32>;
/// ```
///
/// The optional attribute `#[pallet::unbounded]` allows to declare the storage as unbounded.
/// When implementating the storage info (when #[pallet::generate_storage_info]` is specified
/// on the pallet struct placeholder), the size of the storage will be declared as unbounded.
/// This can be useful for storage which can never go into PoV (Proof of Validity).
///
/// The optional attributes `#[cfg(..)]` allow conditional compilation for the storage.
///
/// E.g: