Enum polkadot_node_subsystem_types::messages::CandidateBackingMessage

pub enum CandidateBackingMessage {
    GetBackableCandidates(HashMap<Id, Vec<(CandidateHash, Hash)>>, Sender<HashMap<Id, Vec<BackedCandidate>>>),
    CanSecond(CanSecondRequest, Sender<bool>),
    Second(Hash, CandidateReceipt, PersistedValidationData, PoV),
    Statement(Hash, SignedFullStatementWithPVD),
}

Messages received by the Candidate Backing subsystem.

Variants

GetBackableCandidates(HashMap<Id, Vec<(CandidateHash, Hash)>>, Sender<HashMap<Id, Vec<BackedCandidate>>>)

Requests a set of backable candidates attested by the subsystem.

The order of candidates of the same para must be preserved in the response. If a backed candidate of a para cannot be retrieved, the response should not contain any candidates of the same para that follow it in the input vector. In other words, assuming candidates are supplied in dependency order, we must ensure that this dependency order is preserved.

CanSecond(CanSecondRequest, Sender<bool>)

Request the subsystem to check whether it’s allowed to second given candidate. The rule is to only fetch collations that can either be directly chained to any FragmentChain in the view or there is at least one FragmentChain where this candidate is a potentially unconnected candidate (we predict that it may become connected to a FragmentChain in the future).

Always responds with false if async backing is disabled for candidate’s relay parent.

Second(Hash, CandidateReceipt, PersistedValidationData, PoV)

Note that the Candidate Backing subsystem should second the given candidate in the context of the given relay-parent (ref. by hash). This candidate must be validated.

Statement(Hash, SignedFullStatementWithPVD)

Note a validator’s statement about a particular candidate in the context of the given relay-parent. Disagreements about validity must be escalated to a broader check by the Disputes Subsystem, though that escalation is deferred until the approval voting stage to guarantee availability. Agreements are simply tallied until a quorum is reached.

Trait Implementations

impl Debug for CandidateBackingMessage

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

Formats the value using the given formatter.