Source file fees_storage.ml

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(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
(*                                                                           *)
(* Permission is hereby granted, free of charge, to any person obtaining a   *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense,  *)
(* and/or sell copies of the Software, and to permit persons to whom the     *)
(* Software is furnished to do so, subject to the following conditions:      *)
(*                                                                           *)
(* The above copyright notice and this permission notice shall be included   *)
(* in all copies or substantial portions of the Software.                    *)
(*                                                                           *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL   *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING   *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER       *)
(* DEALINGS IN THE SOFTWARE.                                                 *)
(*                                                                           *)
(*****************************************************************************)

type error += Cannot_pay_storage_fee (* `Temporary *)

type error += Operation_quota_exceeded (* `Temporary *)

type error += Storage_limit_too_high (* `Permanent *)

let () =
  let open Data_encoding in
  register_error_kind
    `Temporary
    ~id:"contract.cannot_pay_storage_fee"
    ~title:"Cannot pay storage fee"
    ~description:"The storage fee is higher than the contract balance"
    ~pp:(fun ppf () -> Format.fprintf ppf "Cannot pay storage storage fee")
    Data_encoding.empty
    (function Cannot_pay_storage_fee -> Some () | _ -> None)
    (fun () -> Cannot_pay_storage_fee) ;
  register_error_kind
    `Temporary
    ~id:"storage_exhausted.operation"
    ~title:"Storage quota exceeded for the operation"
    ~description:
      "A script or one of its callee wrote more bytes than the operation said \
       it would"
    Data_encoding.empty
    (function Operation_quota_exceeded -> Some () | _ -> None)
    (fun () -> Operation_quota_exceeded) ;
  register_error_kind
    `Permanent
    ~id:"storage_limit_too_high"
    ~title:"Storage limit out of protocol hard bounds"
    ~description:"A transaction tried to exceed the hard limit on storage"
    empty
    (function Storage_limit_too_high -> Some () | _ -> None)
    (fun () -> Storage_limit_too_high)

let origination_burn c =
  let origination_size = Constants_storage.origination_size c in
  let cost_per_byte = Constants_storage.cost_per_byte c in
  (* the origination burn, measured in bytes *)
  Tez_repr.(cost_per_byte *? Int64.of_int origination_size)
  >|? fun to_be_paid ->
  (Raw_context.update_allocated_contracts_count c, to_be_paid)

let start_counting_storage_fees c = Raw_context.init_storage_space_to_pay c

(* TODO: https://gitlab.com/tezos/tezos/-/issues/1615
   Refactor other functions in module to use this one.
 
   This function was added when adding the table
   of globals feature. In principle other parts of this module
   could be refactored to use this function. *)
let cost_of_bytes c n =
  let cost_per_byte = Constants_storage.cost_per_byte c in
  Tez_repr.(cost_per_byte *? Z.to_int64 n)

let record_paid_storage_space c contract =
  Contract_storage.used_storage_space c contract >>=? fun size ->
  Contract_storage.set_paid_storage_space_and_return_fees_to_pay c contract size
  >>=? fun (to_be_paid, c) ->
  let c = Raw_context.update_storage_space_to_pay c to_be_paid in
  let cost_per_byte = Constants_storage.cost_per_byte c in
  Lwt.return
    ( Tez_repr.(cost_per_byte *? Z.to_int64 to_be_paid) >|? fun to_burn ->
      (c, size, to_be_paid, to_burn) )

let record_global_constant_storage_space context size =
  (* Following the precedent of big_map, a key in the
     global table of constants costs 65 bytes (see
     [Lazy_storage_diff.Big_map.bytes_size_for_big_map_key])*)
  let cost_of_key = Z.of_int 65 in
  let to_be_paid = Z.add size cost_of_key in
  (Raw_context.update_storage_space_to_pay context to_be_paid, to_be_paid)

let record_paid_storage_space_subsidy c contract =
  let c = start_counting_storage_fees c in
  record_paid_storage_space c contract >>=? fun (c, size, to_be_paid, _) ->
  let (c, _, _) = Raw_context.clear_storage_space_to_pay c in
  return (c, size, to_be_paid)

let burn_storage_fees c ~storage_limit ~payer =
  let origination_size = Constants_storage.origination_size c in
  let (c, storage_space_to_pay, allocated_contracts) =
    Raw_context.clear_storage_space_to_pay c
  in
  let storage_space_for_allocated_contracts =
    Z.mul (Z.of_int allocated_contracts) (Z.of_int origination_size)
  in
  let consumed =
    Z.add storage_space_to_pay storage_space_for_allocated_contracts
  in
  let remaining = Z.sub storage_limit consumed in
  if Compare.Z.(remaining < Z.zero) then fail Operation_quota_exceeded
  else
    let cost_per_byte = Constants_storage.cost_per_byte c in
    Tez_repr.(cost_per_byte *? Z.to_int64 consumed) >>?= fun to_burn ->
    (* Burning the fees... *)
    if Tez_repr.(to_burn = Tez_repr.zero) then
      (* If the payer was was deleted by transferring all its balance, and no space was used,
         burning zero would fail *)
      return c
    else
      trace
        Cannot_pay_storage_fee
        ( Contract_storage.must_exist c payer >>=? fun () ->
          Contract_storage.spend c payer to_burn )

let check_storage_limit c ~storage_limit =
  if
    Compare.Z.(
      storage_limit > (Raw_context.constants c).hard_storage_limit_per_operation)
    || Compare.Z.(storage_limit < Z.zero)
  then error Storage_limit_too_high
  else ok_unit