pub struct MigrationTask<T: Config> { /* private fields */ }
Expand description

A migration task stored in state.

It tracks the last top and child keys read.

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impl<T: Config> MigrationTask<T>

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pub fn migrate_until_exhaustion( &mut self, limits: MigrationLimits, ) -> Result<(), Error<T>>

Migrate keys until either of the given limits are exhausted, or if no more top keys exist.

Note that this can return after the first migration tick that causes exhaustion, specifically in the case of the size constrain. The reason for this is that before reading a key, we simply cannot know how many bytes it is. In other words, this should not be used in any environment where resources are strictly bounded (e.g. a parachain), but it is acceptable otherwise (relay chain, offchain workers).

Trait Implementations§

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impl<T: Clone + Config> Clone for MigrationTask<T>

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fn clone(&self) -> MigrationTask<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Config> Debug for MigrationTask<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: Config> Decode for MigrationTask<T>
where ProgressOf<T>: Decode, PhantomData<T>: Default,

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fn decode<__CodecInputEdqy: Input>( __codec_input_edqy: &mut __CodecInputEdqy, ) -> Result<Self, Error>

Attempt to deserialise the value from input.
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fn decode_into<I>( input: &mut I, dst: &mut MaybeUninit<Self>, ) -> Result<DecodeFinished, Error>
where I: Input,

Attempt to deserialize the value from input into a pre-allocated piece of memory. Read more
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fn skip<I>(input: &mut I) -> Result<(), Error>
where I: Input,

Attempt to skip the encoded value from input. Read more
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fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type. Read more
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impl<T: Config> Default for MigrationTask<T>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T: Config> Encode for MigrationTask<T>
where ProgressOf<T>: Encode,

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fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding. Read more
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fn encode_to<__CodecOutputEdqy: Output + ?Sized>( &self, __codec_dest_edqy: &mut __CodecOutputEdqy, )

Convert self to a slice and append it to the destination.
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fn encode(&self) -> Vec<u8>

Convert self to an owned vector.
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fn using_encoded<R, F>(&self, f: F) -> R
where F: FnOnce(&[u8]) -> R,

Convert self to a slice and then invoke the given closure with it.
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fn encoded_size(&self) -> usize

Calculates the encoded size. Read more
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impl<T: Config> MaxEncodedLen for MigrationTask<T>
where ProgressOf<T>: MaxEncodedLen,

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fn max_encoded_len() -> usize

Upper bound, in bytes, of the maximum encoded size of this item.
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impl<T: PartialEq + Config> PartialEq for MigrationTask<T>

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fn eq(&self, other: &MigrationTask<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> TypeInfo for MigrationTask<T>
where ProgressOf<T>: TypeInfo + 'static, PhantomData<T>: TypeInfo + 'static, T: Config + 'static,

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type Identity = MigrationTask<T>

The type identifying for which type info is provided. Read more
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fn type_info() -> Type

Returns the static type identifier for Self.
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impl<T: Config> EncodeLike for MigrationTask<T>
where ProgressOf<T>: Encode,

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impl<T: Eq + Config> Eq for MigrationTask<T>

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impl<T: Config> StructuralPartialEq for MigrationTask<T>

Auto Trait Implementations§

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impl<T> Freeze for MigrationTask<T>

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impl<T> RefUnwindSafe for MigrationTask<T>

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impl<T> Send for MigrationTask<T>
where T: Send, <T as Config>::MaxKeyLen: Send,

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impl<T> Sync for MigrationTask<T>
where T: Sync, <T as Config>::MaxKeyLen: Sync,

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impl<T> Unpin for MigrationTask<T>
where T: Unpin, <T as Config>::MaxKeyLen: Unpin,

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impl<T> UnwindSafe for MigrationTask<T>

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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where T: ?Sized,

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Immutably borrows from an owned value. Read more
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Mutably borrows from an owned value. Read more
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True iff no bits are set.
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Return the value of Self that is clear.
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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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