Struct polkadot_primitives::v8::SessionInfo

pub struct SessionInfo {

    pub active_validator_indices: Vec<ValidatorIndex>,
    pub random_seed: [u8; 32],
    pub dispute_period: SessionIndex,
    pub validators: IndexedVec<ValidatorIndex, ValidatorId>,
    pub discovery_keys: Vec<AuthorityDiscoveryId>,
    pub assignment_keys: Vec<AssignmentId>,
    pub validator_groups: IndexedVec<GroupIndex, Vec<ValidatorIndex>>,
    pub n_cores: u32,
    pub zeroth_delay_tranche_width: u32,
    pub relay_vrf_modulo_samples: u32,
    pub n_delay_tranches: u32,
    pub no_show_slots: u32,
    pub needed_approvals: u32,
}

Information about validator sets of a session.

NOTE: SessionInfo is frozen. Do not include new fields, consider creating a separate runtime API. Reasoning and further outlook here.

Fields

active_validator_indices: Vec<ValidatorIndex>

All the validators actively participating in parachain consensus. Indices are into the broader validator set.

random_seed: [u8; 32]

A secure random seed for the session, gathered from BABE.

dispute_period: SessionIndex

The amount of sessions to keep for disputes.

validators: IndexedVec<ValidatorIndex, ValidatorId>

Validators in canonical ordering.

NOTE: There might be more authorities in the current session, than validators participating in parachain consensus. See max_validators.

SessionInfo::validators will be limited to to max_validators when set.

discovery_keys: Vec<AuthorityDiscoveryId>

Validators’ authority discovery keys for the session in canonical ordering.

NOTE: The first validators.len() entries will match the corresponding validators in validators, afterwards any remaining authorities can be found. This is any authorities not participating in parachain consensus - see max_validators

assignment_keys: Vec<AssignmentId>

The assignment keys for validators.

NOTE: There might be more authorities in the current session, than validators participating in parachain consensus. See max_validators.

Therefore:

	assignment_keys.len() == validators.len() && validators.len() <= discovery_keys.len()

validator_groups: IndexedVec<GroupIndex, Vec<ValidatorIndex>>

Validators in shuffled ordering - these are the validator groups as produced by the Scheduler module for the session and are typically referred to by GroupIndex.

n_cores: u32

The number of availability cores used by the protocol during this session.

zeroth_delay_tranche_width: u32

The zeroth delay tranche width.

relay_vrf_modulo_samples: u32

The number of samples we do of relay_vrf_modulo.

n_delay_tranches: u32

The number of delay tranches in total.

no_show_slots: u32

How many slots (BABE / SASSAFRAS) must pass before an assignment is considered a no-show.

needed_approvals: u32

The number of validators needed to approve a block.

Trait Implementations

impl Clone for SessionInfo

fn clone(&self) -> SessionInfo

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for SessionInfo

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

Formats the value using the given formatter.

impl Decode for SessionInfo

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

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.

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

where I: Input,

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl Encode for SessionInfo

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

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

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

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

Convert self to an owned vector.

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.

fn encoded_size(&self) -> usize

Calculates the encoded size.

impl PartialEq for SessionInfo

fn eq(&self, other: &SessionInfo) -> bool

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

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 TypeInfo for SessionInfo

type Identity = SessionInfo

The type identifying for which type info is provided.

fn type_info() -> Type

Returns the static type identifier for Self.

impl EncodeLike for SessionInfo

impl StructuralPartialEq for SessionInfo