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Struct pallet_example_mbm::migrations::v1::LazyMigrationV1

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pub struct LazyMigrationV1<T: Config, W: WeightInfo>(/* private fields */);
Expand description

Migrates the items of the crate::MyMap map from u32 to u64.

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 LazyMigrationV1<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. However, this is simplified to perform one stored value mutation per block.

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type Cursor = u32

The cursor type that stores the progress (aka. state) of this migration.
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type Identifier = MigrationId<18>

The unique identifier type of this migration.
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fn pre_upgrade() -> Result<Vec<u8>, TryRuntimeError>

Hook for testing that is run before the migration is started. Read more
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fn post_upgrade(prev: Vec<u8>) -> Result<(), TryRuntimeError>

Hook for testing that is run after the migration is completed. Read more
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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 LazyMigrationV1<T, W>

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impl<T, W> RefUnwindSafe for LazyMigrationV1<T, W>
where T: RefUnwindSafe, W: RefUnwindSafe,

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impl<T, W> Send for LazyMigrationV1<T, W>
where T: Send, W: Send,

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impl<T, W> Sync for LazyMigrationV1<T, W>
where T: Sync, W: Sync,

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impl<T, W> Unpin for LazyMigrationV1<T, W>
where T: Unpin, W: Unpin,

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impl<T, W> UnwindSafe for LazyMigrationV1<T, W>
where 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> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CheckedConversion for T

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fn checked_from<T>(t: T) -> Option<Self>
where Self: TryFrom<T>,

Convert from a value of T into an equivalent instance of Option<Self>. Read more
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fn checked_into<T>(self) -> Option<T>
where Self: TryInto<T>,

Consume self to return Some equivalent value of Option<T>. Read more
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fn conv<T>(self) -> T
where Self: Into<T>,

Converts self into T using Into<T>. Read more
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where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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fn from(t: T) -> T

Returns the argument unchanged.

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Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

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where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

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where Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

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where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn drop(ptr: usize)

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type Output = T

Should always be Self
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fn saturated_from<T>(t: T) -> Self
where Self: UniqueSaturatedFrom<T>,

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fn saturated_into<T>(self) -> T
where Self: UniqueSaturatedInto<T>,

Consume self to return an equivalent value of T. Read more
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impl<T> SteppedMigrations for T
where T: SteppedMigration,

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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 nth_pre_upgrade(n: u32) -> Option<Result<Vec<u8>, DispatchError>>

Call the pre-upgrade hooks of the nth migration. Read more
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fn nth_post_upgrade(n: u32, state: Vec<u8>) -> Option<Result<(), DispatchError>>

Call the post-upgrade hooks of 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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impl<SS, SP> SupersetOf<SS> for SP
where SS: SubsetOf<SP>,

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fn to_subset(&self) -> Option<SS>

The inverse inclusion map: attempts to construct self from the equivalent element of its superset. Read more
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fn is_in_subset(&self) -> bool

Checks if self is actually part of its subset T (and can be converted to it).
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fn to_subset_unchecked(&self) -> SS

Use with care! Same as self.to_subset but without any property checks. Always succeeds.
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The inclusion map: converts self to the equivalent element of its superset.
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where Self: Borrow<B>, B: ?Sized,

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where Self: AsRef<R>, R: ?Sized,

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where Self: Deref<Target = T>, T: ?Sized,

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