Crate sc_consensus_slots

Slots functionality for Substrate.

Some consensus algorithms have a concept of slots, which are intervals in time during which certain events can and/or must occur. This crate provides generic functionality for slots.

Structs

• BackoffAuthoringOnFinalizedHeadLagging
  A simple default strategy for how to decide backing off authoring blocks if the number of unfinalized blocks grows too large.
• SimpleSlotWorkerToSlotWorker
  A type that implements SlotWorker for a type that implements SimpleSlotWorker.
• SlotInfo
  Information about a slot.
• SlotProportion
  A unit type wrapper to express the proportion of a slot.
• SlotResult
  The result of SlotWorker::on_slot.

Enums

• CheckedHeader
  A header which has been checked
• SlotLenienceType
  The strategy used to calculate the slot lenience used to increase the block proposal time when slots have been skipped with no blocks authored.

Constants

• MAX_SLOT_CAPACITY
  We keep at least this number of slots in database.
• PRUNING_BOUND
  We prune slots when they reach this number.

Traits

• BackoffAuthoringBlocksStrategy
  Trait for providing the strategy for when to backoff block authoring.
• InherentDataProviderExt
  Slot specific extension that the inherent data provider needs to implement.
• SimpleSlotWorker
  A skeleton implementation for SlotWorker which tries to claim a slot at its beginning and tries to produce a block if successfully claimed, timing out if block production takes too long.
• SlotWorker
  A worker that should be invoked at every new slot.

Functions

• check_equivocation
  Checks if the header is an equivocation and returns the proof in that case.
• proposing_remaining_duration
  Calculate the remaining duration for block proposal taking into account whether any slots have been skipped and applying the given lenience strategy. If max_block_proposal_slot_portion is not none this method guarantees that the returned duration must be lower or equal to slot_info.duration * max_block_proposal_slot_portion.
• slot_lenience_exponential
  Calculate a slot duration lenience based on the number of missed slots from current to parent. If the number of skipped slots is greater than 0 this method will apply an exponential backoff of at most 2^7 * slot_duration, if no slots were skipped this method will return None.
• slot_lenience_linear
  Calculate a slot duration lenience based on the number of missed slots from current to parent. If the number of skipped slots is greater than 0 this method will apply a linear backoff of at most 20 * slot_duration, if no slots were skipped this method will return None.
• start_slot_worker
  Start a new slot worker.
• time_until_next_slot
  Returns the duration until the next slot from now.

Type Aliases

• StorageChanges
  The changes that need to applied to the storage to create the state for a block.