package tezos-protocol-019-PtParisB

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package tezos-protocol-019-PtParisB
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This module is used to record the shard attestations.

For each attester, a list of shards is associated. For each attested slot (see t) we record that those shards were deemed available.

This information will be used at the end of block finalisation to have the protocol declaring whether the slot is available.

type attested_slots = t
type t

The data-structure used to record the shards attestations.

DAL/FIXME https://gitlab.com/tezos/tezos/-/issues/3145

Consider using the Bounded module. In particular, change the semantics of is_slot_attested accordingly.

val init : number_of_slots:int -> t

init ~number_of_slots initialises a new accountability data-structure with number_of_slots slots and where for every slot, no shard is available.

val record_number_of_attested_shards : t -> attested_slots -> int -> t

record_number_of_attested_shards t slots number records that, for all slots declared available in slots, the given number of shard indices are deemed available. This function must be called at most once for a given attester; otherwise the count will be flawed.

val is_slot_attested : t -> threshold:int -> number_of_shards:int -> Dal_slot_index_repr.t -> bool

is_slot_attested t ~threshold ~number_of_shards slot returns true if the number of shards recorded in t for the slot is above the threshold with respect to the total number of shards specified by number_of_shards. Returns false otherwise or if the index is out of the interval 0; number_of_slots - 1 where number_of_slots is the value provided to the init function.

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