Module drb 

Holds the types and functions for DRB computation.

Modules

election

Functions for leader selection based on the DRB.

Structs

DrbInput

DrbResults

Seeds for DRB computation and computed results.

Heartbeat

A counter a long computation bumps as it makes progress.

Constants

DIFFICULTY_LEVEL

Arbitrary number of times the hash function will be repeatedly called.

DRB_CANCEL_BATCH 🔒

Hashes between cancellation checks. Bounds both how long hashing continues after cancel fires and how stale a supervisor’s view of Heartbeat can be; independent of the DRB_CHECKPOINT_INTERVAL persistence cadence.

DRB_CHECKPOINT_INTERVAL

Interval at which to store the results

DRB_PROGRESS_LOAD_TIMEOUT

Default upper bound on loading previously stored DRB progress at the start of a computation. Sized like the stake-table storage bound (espresso’s DEFAULT_STORAGE_READ_TIMEOUT).

INITIAL_DRB_RESULT

DRB result for epoch 1 and 2.

INITIAL_DRB_SEED_INPUT

DRB seed input for epoch 1 and 2.

KEEP_PREVIOUS_RESULT_COUNT

Number of previous results and seeds to keep

Functions

compute_drb_result

Compute the DRB result for the leader rotation.

difficulty_level

Difficulty level of the DRB calculation.

drb_difficulty_selector

hash_batches 🔒

Hash hash repeatedly count times, checking cancel and bumping heartbeat between batches.

Type Aliases

DrbDifficultySelectorFn

DrbResult

Alias for DRB result from compute_drb_result.

DrbSeedInput

Alias for DRB seed input for compute_drb_result, serialized from the QC signature.