pallet_messages::migration::v3

Struct MigrateV2ToV3

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pub struct MigrateV2ToV3<T: Config, W: WeightInfo>(/* private fields */);
Expand description

Migrates the items of the [v2::MessagesV2] map to [crate::MessagesV3]

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 MigrateV2ToV3<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 = (<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number, u16, u16, u64)

The cursor type that stores the progress (aka. state) of this migration.
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type Identifier = MigrationId<31>

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 MigrateV2ToV3<T, W>
where <T as Config>::RuntimeEvent: Sized,

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impl<T, W> RefUnwindSafe for MigrateV2ToV3<T, W>
where <T as Config>::RuntimeEvent: Sized, T: RefUnwindSafe, W: RefUnwindSafe,

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impl<T, W> Send for MigrateV2ToV3<T, W>
where <T as Config>::RuntimeEvent: Sized, T: Send, W: Send,

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impl<T, W> Sync for MigrateV2ToV3<T, W>
where <T as Config>::RuntimeEvent: Sized, T: Sync, W: Sync,

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impl<T, W> Unpin for MigrateV2ToV3<T, W>
where <T as Config>::RuntimeEvent: Sized, T: Unpin, W: Unpin,

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impl<T, W> UnwindSafe for MigrateV2ToV3<T, W>
where <T as Config>::RuntimeEvent: Sized, T: UnwindSafe, W: UnwindSafe,

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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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Immutably borrows from an owned value. 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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