Source file commitment_storage.ml

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(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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let exists = Storage.Commitments.mem

let committed_amount ctxt bpkh =
  Storage.Commitments.find ctxt bpkh >>=? fun balance ->
  return (Option.value ~default:Tez_repr.zero balance)

let increase_commitment_only_call_from_token ctxt bpkh amount =
  if Tez_repr.(amount = zero) then return ctxt
  else
    committed_amount ctxt bpkh >>=? fun balance ->
    Tez_repr.(amount +? balance) >>?= fun new_balance ->
    Storage.Commitments.add ctxt bpkh new_balance >|= ok

let decrease_commitment_only_call_from_token ctxt bpkh amount =
  committed_amount ctxt bpkh >>=? fun balance ->
  Tez_repr.(balance -? amount) >>?= fun new_balance ->
  if Tez_repr.(new_balance = Tez_repr.zero) then
    Storage.Commitments.remove ctxt bpkh >|= ok
  else Storage.Commitments.add ctxt bpkh new_balance >|= ok