pallet_stateful_storage::migration::v2

Struct MigratePaginatedV1ToV2

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pub struct MigratePaginatedV1ToV2<T: Config, W: WeightInfo>(/* private fields */);
Expand description

The step function will be called once per block. It is very important that this function never panics and never uses more weight than it got in its meter. The migrations should also try to make maximal progress per step, so that the total time it takes to migrate stays low.

Trait Implementations§

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impl<T: Config, W: WeightInfo> SteppedMigration for MigratePaginatedV1ToV2<T, W>

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fn id() -> Self::Identifier

The identifier of this migration. Which should be globally unique.

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fn step( cursor: Option<Self::Cursor>, meter: &mut WeightMeter, ) -> Result<Option<Self::Cursor>, SteppedMigrationError>

The actual logic of the migration.

This function is called repeatedly until it returns Ok(None), indicating that the migration is complete. Ideally, the migration should be designed in such a way that each step consumes as much weight as possible.

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type Cursor = ChildCursor<ConstU32<68>>

The cursor type that stores the progress (aka. state) of this migration.
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type Identifier = MigrationId<50>

The unique identifier type of this migration.
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fn max_steps() -> Option<u32>

The maximum number of steps that this migration can take. Read more
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fn transactional_step( cursor: Option<Self::Cursor>, meter: &mut WeightMeter, ) -> Result<Option<Self::Cursor>, SteppedMigrationError>

Same as [Self::step], but rolls back pending changes in the error case.

Auto Trait Implementations§

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impl<T, W> Freeze for MigratePaginatedV1ToV2<T, W>
where <T as Config>::RuntimeEvent: Sized,

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impl<T, W> RefUnwindSafe for MigratePaginatedV1ToV2<T, W>
where <T as Config>::RuntimeEvent: Sized, T: RefUnwindSafe, W: RefUnwindSafe,

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impl<T, W> Send for MigratePaginatedV1ToV2<T, W>
where <T as Config>::RuntimeEvent: Sized, T: Send, W: Send,

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impl<T, W> Sync for MigratePaginatedV1ToV2<T, W>
where <T as Config>::RuntimeEvent: Sized, T: Sync, W: Sync,

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impl<T, W> Unpin for MigratePaginatedV1ToV2<T, W>
where <T as Config>::RuntimeEvent: Sized, T: Unpin, W: Unpin,

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impl<T, W> UnwindSafe for MigratePaginatedV1ToV2<T, W>
where <T as Config>::RuntimeEvent: Sized, T: UnwindSafe, W: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> SteppedMigrations for T
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fn len() -> u32

The number of migrations that Self aggregates.
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fn nth_id(n: u32) -> Option<Vec<u8>>

The nth [SteppedMigration::id]. Read more
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fn nth_max_steps(n: u32) -> Option<Option<u32>>

The [SteppedMigration::max_steps] of the nth migration. Read more
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fn nth_step( n: u32, cursor: Option<Vec<u8>>, meter: &mut WeightMeter, ) -> Option<Result<Option<Vec<u8>>, SteppedMigrationError>>

Do a [SteppedMigration::step] on the nth migration. Read more
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fn nth_transactional_step( n: u32, cursor: Option<Vec<u8>>, meter: &mut WeightMeter, ) -> Option<Result<Option<Vec<u8>>, SteppedMigrationError>>

Do a [SteppedMigration::transactional_step] on the nth migration. Read more
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fn cursor_max_encoded_len() -> usize

The maximal encoded length across all cursors.
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fn identifier_max_encoded_len() -> usize

The maximal encoded length across all identifiers.
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fn integrity_test() -> Result<(), &'static str>

Assert the integrity of the migrations. Read more
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