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migrations: prevent accidentally using unversioned migrations instead of VersionedMigration (#3835)

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closes #1324 

#### Problem
Currently, it is possible to accidentally use inner unversioned
migration instead of `VersionedMigration` since both implement
`OnRuntimeUpgrade`.

#### Solution

With this change, we make it clear that value of `Inner` is not intended
to be used directly. It is achieved by bounding `Inner` to new trait
`UncheckedOnRuntimeUpgrade`, which has the same interface (except
`unchecked_` prefix) as `OnRuntimeUpgrade`.

#### `try-runtime` functions

Since developers can implement `try-runtime` for `Inner` value in
`VersionedMigration` and have custom logic for it, I added the same
`try-runtime` functions to `UncheckedOnRuntimeUpgrade`. I looked for a
ways to not duplicate functions, but couldn't find anything that doesn't
significantly change the codebase. So I would appreciate If you have any
suggestions to improve this

cc @liamaharon @xlc 

polkadot address: 16FqwPZ8GRC5U5D4Fu7W33nA55ZXzXGWHwmbnE1eT6pxuqcT

---------

Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
This commit is contained in:
Dastan
2024-04-02 15:43:09 +02:00
committed by GitHub
parent 8e95a3e1aa
commit e54279699b
22 changed files with 255 additions and 187 deletions
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substrate/frame/support/src/traits.rs
+1 -1
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@@ -87,7 +87,7 @@ pub use hooks::GenesisBuild;
pub use hooks::{
BeforeAllRuntimeMigrations, BuildGenesisConfig, Hooks, IntegrityTest, OnFinalize, OnGenesis,
OnIdle, OnInitialize, OnPoll, OnRuntimeUpgrade, OnTimestampSet, PostInherents,
PostTransactions, PreInherents,
PostTransactions, PreInherents, UncheckedOnRuntimeUpgrade,
};
pub mod schedule;