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cumulus_pallet_aura_ext::consensus_hook

Struct FixedVelocityConsensusHook

Source 
pub struct FixedVelocityConsensusHook<T, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32>(/* private fields */);
Expand description

A consensus hook that enforces fixed block production velocity and unincluded segment capacity.

It keeps track of relay chain slot information and parachain blocks authored per relay chain slot.

§Type Parameters

  • T - The runtime configuration trait
  • RELAY_CHAIN_SLOT_DURATION_MILLIS - Duration of relay chain slots in milliseconds
  • V - Maximum number of blocks that can be authored per relay chain parent (velocity)
  • C - Maximum capacity of unincluded segment

§Example Configuration

ⓘ
type ConsensusHook = FixedVelocityConsensusHook<Runtime, 6000, 2, 8>;

This configures:

  • 6 second relay chain slots
  • Maximum 2 blocks per slot
  • Maximum 8 blocks in unincluded segment

Implementations§

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impl<T: Config + Config, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>

Source

pub fn can_build_upon(included_hash: T::Hash, new_slot: Slot) -> bool

Whether it is legal to extend the chain, assuming the given block is the most recently included one as-of the relay parent that will be built against, and the given slot.

This should be consistent with the logic the runtime uses when validating blocks to avoid issues.

When the unincluded segment is empty, i.e. included_hash == at, where at is the block whose state we are querying against, this must always return true as long as the slot is more recent than the included block itself.

Trait Implementations§

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impl<T: Config, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> ConsensusHook for FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>
where <T as Config>::Moment: Into<u64>,

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fn on_state_proof( state_proof: &RelayChainStateProof, ) -> (Weight, UnincludedSegmentCapacity)

Consensus hook that performs validations on the provided relay chain state proof:

  • Ensures blocks are not produced faster than the specified velocity V
  • Verifies parachain slot alignment with relay chain slot
§Panics
  • When the relay chain slot from the state is smaller than the slot from the proof
  • When the number of authored blocks exceeds velocity limit
  • When parachain slot is ahead of the calculated slot from relay chain

Auto Trait Implementations§

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impl<T, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> Freeze for FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>

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impl<T, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> RefUnwindSafe for FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>
where T: RefUnwindSafe,

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impl<T, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> Send for FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>
where T: Send,

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impl<T, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> Sync for FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>
where T: Sync,

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impl<T, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> Unpin for FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>
where T: Unpin,

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impl<T, const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32, const V: u32, const C: u32> UnwindSafe for FixedVelocityConsensusHook<T, RELAY_CHAIN_SLOT_DURATION_MILLIS, V, C>
where T: UnwindSafe,

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