122 lines
5.1 KiB
OCaml
122 lines
5.1 KiB
OCaml
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(*****************************************************************************)
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(* *)
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(* Open Source License *)
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(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* Permission is hereby granted, free of charge, to any person obtaining a *)
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(* copy of this software and associated documentation files (the "Software"),*)
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(* to deal in the Software without restriction, including without limitation *)
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(* the rights to use, copy, modify, merge, publish, distribute, sublicense, *)
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(* and/or sell copies of the Software, and to permit persons to whom the *)
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(* Software is furnished to do so, subject to the following conditions: *)
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(* *)
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(* The above copyright notice and this permission notice shall be included *)
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(* in all copies or substantial portions of the Software. *)
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(* *)
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(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
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(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
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(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
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(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
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(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *)
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(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *)
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(* DEALINGS IN THE SOFTWARE. *)
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(* *)
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(*****************************************************************************)
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type t = Seed_repr.nonce
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type nonce = t
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let encoding = Seed_repr.nonce_encoding
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type error +=
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| Too_late_revelation
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| Too_early_revelation
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| Previously_revealed_nonce
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| Unexpected_nonce
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let () =
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register_error_kind
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`Branch
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~id:"nonce.too_late_revelation"
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~title:"Too late nonce revelation"
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~description:"Nonce revelation happens too late"
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~pp: (fun ppf () ->
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Format.fprintf ppf "This nonce cannot be revealed anymore.")
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Data_encoding.unit
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(function Too_late_revelation -> Some () | _ -> None)
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(fun () -> Too_late_revelation) ;
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register_error_kind
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`Temporary
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~id:"nonce.too_early_revelation"
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~title:"Too early nonce revelation"
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~description:"Nonce revelation happens before cycle end"
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~pp: (fun ppf () ->
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Format.fprintf ppf "This nonce should not yet be revealed")
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Data_encoding.unit
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(function Too_early_revelation -> Some () | _ -> None)
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(fun () -> Too_early_revelation) ;
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register_error_kind
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`Branch
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~id:"nonce.previously_revealed"
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~title:"Previously revealed nonce"
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~description:"Duplicated revelation for a nonce."
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~pp: (fun ppf () ->
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Format.fprintf ppf "This nonce was previously revealed")
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Data_encoding.unit
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(function Previously_revealed_nonce -> Some () | _ -> None)
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(fun () -> Previously_revealed_nonce) ;
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register_error_kind
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`Branch
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~id:"nonce.unexpected"
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~title:"Unexpected nonce"
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~description:"The provided nonce is inconsistent with the committed nonce hash."
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~pp: (fun ppf () ->
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Format.fprintf ppf "This nonce revelation is invalid (inconsistent with the committed hash)")
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Data_encoding.unit
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(function Unexpected_nonce -> Some () | _ -> None)
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(fun () -> Unexpected_nonce)
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(* checks that the level of a revelation is not too early or too late wrt to the
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current context and that a nonce has not been already revealed for that level *)
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let get_unrevealed ctxt level =
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let cur_level = Level_storage.current ctxt in
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match Cycle_repr.pred cur_level.cycle with
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| None -> fail Too_early_revelation (* no revelations during cycle 0 *)
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| Some revealed_cycle ->
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if Cycle_repr.(revealed_cycle < level.Level_repr.cycle) then
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fail Too_early_revelation
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else if Cycle_repr.(level.Level_repr.cycle < revealed_cycle) then
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fail Too_late_revelation
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else
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Storage.Seed.Nonce.get ctxt level >>=? function
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| Revealed _ -> fail Previously_revealed_nonce
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| Unrevealed status -> return status
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let record_hash ctxt unrevealed =
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let level = Level_storage.current ctxt in
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Storage.Seed.Nonce.init ctxt level (Unrevealed unrevealed)
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let reveal ctxt level nonce =
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get_unrevealed ctxt level >>=? fun unrevealed ->
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fail_unless
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(Seed_repr.check_hash nonce unrevealed.nonce_hash)
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Unexpected_nonce >>=? fun () ->
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Storage.Seed.Nonce.set ctxt level (Revealed nonce) >>=? fun ctxt ->
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return ctxt
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type unrevealed = Storage.Seed.unrevealed_nonce = {
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nonce_hash: Nonce_hash.t ;
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delegate: Signature.Public_key_hash.t ;
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rewards: Tez_repr.t ;
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fees: Tez_repr.t ;
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}
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type status = Storage.Seed.nonce_status =
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| Unrevealed of unrevealed
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| Revealed of Seed_repr.nonce
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let get = Storage.Seed.Nonce.get
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let of_bytes = Seed_repr.make_nonce
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let hash = Seed_repr.hash
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let check_hash = Seed_repr.check_hash
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