Struct polkadot_primitives::v8::PersistedValidationData
source · pub struct PersistedValidationData<H = Hash, N = BlockNumber> {
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§
Trait Implementations§
source§impl<H: Clone, N: Clone> Clone for PersistedValidationData<H, N>
impl<H: Clone, N: Clone> Clone for PersistedValidationData<H, N>
source§fn clone(&self) -> PersistedValidationData<H, N>
fn clone(&self) -> PersistedValidationData<H, N>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl<H, N> Debug for PersistedValidationData<H, N>
impl<H, N> Debug for PersistedValidationData<H, N>
source§impl<H, N> Decode for PersistedValidationData<H, N>where
N: Decode,
H: Decode,
impl<H, N> Decode for PersistedValidationData<H, N>where
N: Decode,
H: Decode,
source§fn decode<__CodecInputEdqy: Input>(
__codec_input_edqy: &mut __CodecInputEdqy,
) -> Result<Self, Error>
fn decode<__CodecInputEdqy: Input>( __codec_input_edqy: &mut __CodecInputEdqy, ) -> Result<Self, Error>
§fn decode_into<I>(
input: &mut I,
dst: &mut MaybeUninit<Self>,
) -> Result<DecodeFinished, Error>where
I: Input,
fn decode_into<I>(
input: &mut I,
dst: &mut MaybeUninit<Self>,
) -> Result<DecodeFinished, Error>where
I: Input,
§fn skip<I>(input: &mut I) -> Result<(), Error>where
I: Input,
fn skip<I>(input: &mut I) -> Result<(), Error>where
I: Input,
§fn encoded_fixed_size() -> Option<usize>
fn encoded_fixed_size() -> Option<usize>
source§impl<H: Default, N: Default> Default for PersistedValidationData<H, N>
impl<H: Default, N: Default> Default for PersistedValidationData<H, N>
source§fn default() -> PersistedValidationData<H, N>
fn default() -> PersistedValidationData<H, N>
source§impl<H, N> Encode for PersistedValidationData<H, N>where
N: Encode,
H: Encode,
impl<H, N> Encode for PersistedValidationData<H, N>where
N: Encode,
H: Encode,
source§fn size_hint(&self) -> usize
fn size_hint(&self) -> usize
source§fn encode_to<__CodecOutputEdqy: Output + ?Sized>(
&self,
__codec_dest_edqy: &mut __CodecOutputEdqy,
)
fn encode_to<__CodecOutputEdqy: Output + ?Sized>( &self, __codec_dest_edqy: &mut __CodecOutputEdqy, )
§fn using_encoded<R, F>(&self, f: F) -> R
fn using_encoded<R, F>(&self, f: F) -> R
§fn encoded_size(&self) -> usize
fn encoded_size(&self) -> usize
source§impl<H: PartialEq, N: PartialEq> PartialEq for PersistedValidationData<H, N>
impl<H: PartialEq, N: PartialEq> PartialEq for PersistedValidationData<H, N>
source§fn eq(&self, other: &PersistedValidationData<H, N>) -> bool
fn eq(&self, other: &PersistedValidationData<H, N>) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl<H, N> TypeInfo for PersistedValidationData<H, N>where
N: TypeInfo + 'static,
H: TypeInfo + 'static,
impl<H, N> TypeInfo for PersistedValidationData<H, N>where
N: TypeInfo + 'static,
H: TypeInfo + 'static,
impl<H, N> EncodeLike for PersistedValidationData<H, N>where
N: Encode,
H: Encode,
impl<H: Eq, N: Eq> Eq for PersistedValidationData<H, N>
impl<H, N> StructuralPartialEq for PersistedValidationData<H, N>
Auto Trait Implementations§
impl<H, N> Freeze for PersistedValidationData<H, N>
impl<H, N> RefUnwindSafe for PersistedValidationData<H, N>where
N: RefUnwindSafe,
H: RefUnwindSafe,
impl<H, N> Send for PersistedValidationData<H, N>
impl<H, N> Sync for PersistedValidationData<H, N>
impl<H, N> Unpin for PersistedValidationData<H, N>
impl<H, N> UnwindSafe for PersistedValidationData<H, N>where
N: UnwindSafe,
H: UnwindSafe,
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