56 lines
2.4 KiB
OCaml
56 lines
2.4 KiB
OCaml
(**************************************************************************)
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(* *)
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(* Copyright (c) 2014 - 2017. *)
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(* Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* All rights reserved. No warranty, explicit or implicit, provided. *)
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(* *)
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(**************************************************************************)
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val fold:
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f:('a ->
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block:Block_hash.t -> pred:Block_hash.t ->
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step:int -> strict_step:bool -> 'a) ->
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'a -> Block_locator.t -> 'a
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(** [map f l] applies [f] to each block of the locator, the last one
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excepted. The function also receives the expected predecessor
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[pred] of the [block] after [step] steps, i.e. the next block in
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the locator. When [strict_step] is [true], then [step] is the
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exact number of predecessor to be followed before to found
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[pred]. Otherwise, it is only an upper bound. *)
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type step = {
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block: Block_hash.t ;
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predecessor: Block_hash.t ;
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step: int ;
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strict_step: bool ;
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}
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(** A 'step' in a locator is a couple of consecutives hashes in the
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locator, and the expected difference of level the two blocks (or
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an upper bounds when [strict_step = false]). *)
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val to_steps: Block_locator.t -> step list
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(** Build all the 'steps' composing the locator, starting with the
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oldest one (typically the predecessor of the first step will be
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`genesis`). All steps contains [strict_step = true], except the
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first one. *)
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val estimated_length: Block_locator.t -> int
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(** [estimated_length locator] estimate the length of the chain
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represented by [locator]. *)
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val known_ancestor:
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State.Net.t -> Block_locator.t -> (State.Block.t * Block_locator.t) option Lwt.t
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(** [known_ancestor net_state locator] computes the first block of
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[locator] that is known to be a valid block. It also computes the
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'prefix' of [locator] with end at the first valid block. The
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function returns [None] when no block in the locator are known or
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if the first known block is invalid. *)
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val find_new:
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State.Net.t -> Block_locator.t -> int -> Block_hash.t list Lwt.t
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(** [find_new net locator max_length] returns the blocks from our
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current branch that would be unknown to a peer that sends us the
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[locator]. *)
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