pub struct PersistedValidationData<H = H256, N = u32> {
    pub parent_head: HeadData,
    pub relay_parent_number: N,
    pub relay_parent_storage_root: H,
    pub max_pov_size: u32,
}
Expand description

The validation data provides information about how to create the inputs for validation of a candidate. This information is derived from the chain state and will vary from para to para, although some fields may be the same for every para.

Since this data is used to form inputs to the validation function, it needs to be persisted by the availability system to avoid dependence on availability of the relay-chain state.

Furthermore, the validation data acts as a way to authorize the additional data the collator needs to pass to the validation function. For example, the validation function can check whether the incoming messages (e.g. downward messages) were actually sent by using the data provided in the validation data using so called MQC heads.

Since the commitments of the validation function are checked by the relay-chain, secondary checkers can rely on the invariant that the relay-chain only includes para-blocks for which these checks have already been done. As such, there is no need for the validation data used to inform validators and collators about the checks the relay-chain will perform to be persisted by the availability system.

The PersistedValidationData should be relatively lightweight primarily because it is constructed during inclusion for each candidate and therefore lies on the critical path of inclusion.

Fields§

§parent_head: HeadData

The parent head-data.

§relay_parent_number: N

The relay-chain block number this is in the context of.

§relay_parent_storage_root: H

The relay-chain block storage root this is in the context of.

§max_pov_size: u32

The maximum legal size of a POV block, in bytes.

Implementations§

§

impl<H, N> PersistedValidationData<H, N>where H: Encode, N: Encode,

pub fn hash(&self) -> H256

Compute the blake2-256 hash of the persisted validation data.

Trait Implementations§

§

impl<H, N> Clone for PersistedValidationData<H, N>where H: Clone, N: Clone,

§

fn clone(&self) -> PersistedValidationData<H, N>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
§

impl<H, N> Debug for PersistedValidationData<H, N>where H: Debug, N: Debug,

§

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

Formats the value using the given formatter. Read more
§

impl<H, N> Decode for PersistedValidationData<H, N>where N: Decode, H: Decode,

§

fn decode<__CodecInputEdqy>( __codec_input_edqy: &mut __CodecInputEdqy ) -> Result<PersistedValidationData<H, N>, Error>where __CodecInputEdqy: Input,

Attempt to deserialise the value from input.
§

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
§

fn skip<I>(input: &mut I) -> Result<(), Error>where I: Input,

Attempt to skip the encoded value from input. Read more
§

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type. Read more
§

impl<H, N> Default for PersistedValidationData<H, N>where H: Default, N: Default,

§

fn default() -> PersistedValidationData<H, N>

Returns the “default value” for a type. Read more
§

impl<H, N> Encode for PersistedValidationData<H, N>where N: Encode, H: Encode,

§

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding. Read more
§

fn encode_to<__CodecOutputEdqy>( &self, __codec_dest_edqy: &mut __CodecOutputEdqy )where __CodecOutputEdqy: Output + ?Sized,

Convert self to a slice and append it to the destination.
§

fn encode(&self) -> Vec<u8, Global>

Convert self to an owned vector.
§

fn using_encoded<R, F>(&self, f: F) -> Rwhere F: FnOnce(&[u8]) -> R,

Convert self to a slice and then invoke the given closure with it.
§

fn encoded_size(&self) -> usize

Calculates the encoded size. Read more
§

impl<H, N> PartialEq<PersistedValidationData<H, N>> for PersistedValidationData<H, N>where H: PartialEq<H>, N: PartialEq<N>,

§

fn eq(&self, other: &PersistedValidationData<H, N>) -> bool

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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.
§

impl<H, N> TypeInfo for PersistedValidationData<H, N>where N: TypeInfo + 'static, H: TypeInfo + 'static,

§

type Identity = PersistedValidationData<H, N>

The type identifying for which type info is provided. Read more
§

fn type_info() -> Type<MetaForm>

Returns the static type identifier for Self.
§

impl<H, N> EncodeLike<PersistedValidationData<H, N>> for PersistedValidationData<H, N>where N: Encode, H: Encode,

§

impl<H, N> Eq for PersistedValidationData<H, N>where H: Eq, N: Eq,

§

impl<H, N> StructuralEq for PersistedValidationData<H, N>

§

impl<H, N> StructuralPartialEq for PersistedValidationData<H, N>

Auto Trait Implementations§

§

impl<H, N> RefUnwindSafe for PersistedValidationData<H, N>where H: RefUnwindSafe, N: RefUnwindSafe,

§

impl<H, N> Send for PersistedValidationData<H, N>where H: Send, N: Send,

§

impl<H, N> Sync for PersistedValidationData<H, N>where H: Sync, N: Sync,

§

impl<H, N> Unpin for PersistedValidationData<H, N>where H: Unpin, N: Unpin,

§

impl<H, N> UnwindSafe for PersistedValidationData<H, N>where H: UnwindSafe, N: UnwindSafe,

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
§

impl<T> Any for Twhere T: Any,

§

fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>

§

fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>

§

fn type_name(&self) -> &'static str

§

impl<T> AnySync for Twhere T: Any + Send + Sync,

§

fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Sync + Send + 'static>

source§

impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

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

Mutably borrows from an owned value. Read more
§

impl<T> CheckedConversion for T

§

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
§

fn checked_into<T>(self) -> Option<T>where Self: TryInto<T>,

Consume self to return Some equivalent value of Option<T>. Read more
§

impl<T> Clear for Twhere T: Default + Eq + PartialEq<T>,

§

fn is_clear(&self) -> bool

True iff no bits are set.
§

fn clear() -> T

Return the value of Self that is clear.
§

impl<T> Conv for T

§

fn conv<T>(self) -> Twhere Self: Into<T>,

Converts self into T using Into<T>. Read more
§

impl<T> DecodeAll for Twhere T: Decode,

§

fn decode_all(input: &mut &[u8]) -> Result<T, Error>

Decode Self and consume all of the given input data. Read more
§

impl<T> DecodeLimit for Twhere T: Decode,

§

fn decode_all_with_depth_limit( limit: u32, input: &mut &[u8] ) -> Result<T, Error>

Decode Self and consume all of the given input data. Read more
§

fn decode_with_depth_limit<I>(limit: u32, input: &mut I) -> Result<T, Error>where I: Input,

Decode Self with the given maximum recursion depth and advance input by the number of bytes consumed. Read more
source§

impl<T> DynClone for Twhere T: Clone,

source§

fn __clone_box(&self, _: Private) -> *mut ()

§

impl<T> EncodeAs<T> for Twhere T: Encode,

§

fn encode_as(&self) -> Vec<u8, Global>

Convert Self into T, then encode T. Read more
§

impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
source§

impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

source§

fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
§

impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
§

impl<T> FmtForward for T

§

fn fmt_binary(self) -> FmtBinary<Self>where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted. Read more
§

fn fmt_display(self) -> FmtDisplay<Self>where Self: Display,

Causes self to use its Display implementation when Debug-formatted. Read more
§

fn fmt_lower_exp(self) -> FmtLowerExp<Self>where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted. Read more
§

fn fmt_lower_hex(self) -> FmtLowerHex<Self>where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted. Read more
§

fn fmt_octal(self) -> FmtOctal<Self>where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted. Read more
§

fn fmt_pointer(self) -> FmtPointer<Self>where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted. Read more
§

fn fmt_upper_exp(self) -> FmtUpperExp<Self>where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted. Read more
§

fn fmt_upper_hex(self) -> FmtUpperHex<Self>where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted. Read more
§

fn fmt_list(self) -> FmtList<Self>where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
source§

impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

§

impl<T> Hashable for Twhere T: Codec,

§

fn blake2_128(&self) -> [u8; 16]

§

fn blake2_256(&self) -> [u8; 32]

§

fn blake2_128_concat(&self) -> Vec<u8, Global>

§

fn twox_128(&self) -> [u8; 16]

§

fn twox_256(&self) -> [u8; 32]

§

fn twox_64_concat(&self) -> Vec<u8, Global>

§

fn identity(&self) -> Vec<u8, Global>

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

§

impl<T> IsType<T> for T

§

fn from_ref(t: &T) -> &T

Cast reference.
§

fn into_ref(&self) -> &T

Cast reference.
§

fn from_mut(t: &mut T) -> &mut T

Cast mutable reference.
§

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

Cast mutable reference.
§

impl<T, Outer> IsWrappedBy<Outer> for Twhere Outer: AsRef<T> + AsMut<T> + From<T>, T: From<Outer>,

§

fn from_ref(outer: &Outer) -> &T

Get a reference to the inner from the outer.

§

fn from_mut(outer: &mut Outer) -> &mut T

Get a mutable reference to the inner from the outer.

§

impl<T> KeyedVec for Twhere T: Codec,

§

fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8, Global>

Return an encoding of Self prepended by given slice.
§

impl<T> Pipe for Twhere T: ?Sized,

§

fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> Rwhere Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
§

fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> Rwhere R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
§

fn pipe_ref_mut<'a, R>(&'a mut self, func: impl FnOnce(&'a mut Self) -> R) -> Rwhere R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
§

fn pipe_borrow<'a, B, R>(&'a self, func: impl FnOnce(&'a B) -> R) -> Rwhere Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
§

fn pipe_borrow_mut<'a, B, R>( &'a mut self, func: impl FnOnce(&'a mut B) -> R ) -> Rwhere Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
§

fn pipe_as_ref<'a, U, R>(&'a self, func: impl FnOnce(&'a U) -> R) -> Rwhere Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
§

fn pipe_as_mut<'a, U, R>(&'a mut self, func: impl FnOnce(&'a mut U) -> R) -> Rwhere Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
§

fn pipe_deref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> Rwhere Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

Borrows self, then passes self.deref() into the pipe function.
§

fn pipe_deref_mut<'a, T, R>( &'a mut self, func: impl FnOnce(&'a mut T) -> R ) -> Rwhere Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
§

impl<T> Pointable for T

§

const ALIGN: usize = mem::align_of::<T>()

The alignment of pointer.
§

type Init = T

The type for initializers.
§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
§

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
§

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
§

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
source§

impl<T> Same<T> for T

§

type Output = T

Should always be Self
§

impl<T> SaturatedConversion for T

§

fn saturated_from<T>(t: T) -> Selfwhere Self: UniqueSaturatedFrom<T>,

Convert from a value of T into an equivalent instance of Self. Read more
§

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

Consume self to return an equivalent value of T. Read more
§

impl<T> Tap for T

§

fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
§

fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
§

fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Selfwhere Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
§

fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
§

fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Selfwhere Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
§

fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
§

fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Selfwhere Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
§

fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
§

fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
§

fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
§

fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Selfwhere Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
§

fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
§

fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Selfwhere Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
§

fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
§

fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Selfwhere Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
§

fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
source§

impl<T> ToOwned for Twhere T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
§

impl<T> TryConv for T

§

fn try_conv<T>(self) -> Result<T, Self::Error>where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
§

impl<S, T> UncheckedInto<T> for Swhere T: UncheckedFrom<S>,

§

fn unchecked_into(self) -> T

The counterpart to unchecked_from.
§

impl<T, S> UniqueSaturatedInto<T> for Swhere T: Bounded, S: TryInto<T>,

§

fn unique_saturated_into(self) -> T

Consume self to return an equivalent value of T.
§

impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

§

fn vzip(self) -> V

source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
§

impl<S> Codec for Swhere S: Decode + Encode,

§

impl<T> EncodeLike<&&T> for Twhere T: Encode,

§

impl<T> EncodeLike<&T> for Twhere T: Encode,

§

impl<T> EncodeLike<&mut T> for Twhere T: Encode,

§

impl<T> EncodeLike<Arc<T>> for Twhere T: Encode,

§

impl<T> EncodeLike<Box<T, Global>> for Twhere T: Encode,

§

impl<'a, T> EncodeLike<Cow<'a, T>> for Twhere T: ToOwned + Encode,

§

impl<T> EncodeLike<Rc<T>> for Twhere T: Encode,

§

impl<S> FullCodec for Swhere S: Decode + FullEncode,

§

impl<S> FullEncode for Swhere S: Encode + EncodeLike<S>,

§

impl<T> JsonSchemaMaybe for T

§

impl<T> MaybeDebug for Twhere T: Debug,

§

impl<T> MaybeRefUnwindSafe for Twhere T: RefUnwindSafe,

§

impl<T> MaybeSend for Twhere T: Send,

§

impl<T> Member for Twhere T: Send + Sync + Debug + Eq + PartialEq<T> + Clone + 'static,

§

impl<T> Parameter for Twhere T: Codec + EncodeLike<T> + Clone + Eq + Debug + TypeInfo,

§

impl<T> StaticTypeInfo for Twhere T: TypeInfo + 'static,