zk_rollup_storage.ml
(*****************************************************************************)
(* *)
(* Open Source License *)
(* Copyright (c) 2022 Nomadic Labs <contact@nomadic-labs.com> *)
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type error +=
| Zk_rollup_does_not_exist of Zk_rollup_repr.t
| Zk_rollup_invalid_op_code of int
| Zk_rollup_pending_list_too_short
| Zk_rollup_negative_length
let () =
register_error_kind
`Temporary
~id:"zk_rollup_does_not_exist"
~title:"ZK Rollup does not exist"
~description:"Attempted to use a ZK rollup that has not been originated."
~pp:(fun ppf x ->
Format.fprintf ppf "Rollup %a does not exist" Zk_rollup_repr.Address.pp x)
Data_encoding.(obj1 (req "rollup" Zk_rollup_repr.Address.encoding))
(function Zk_rollup_does_not_exist x -> Some x | _ -> None)
(fun x -> Zk_rollup_does_not_exist x) ;
register_error_kind
`Permanent
~id:"zk_rollup_invalid_op code"
~title:"Invalid op code in append"
~description:"Invalid op code in append"
~pp:(fun ppf oc ->
Format.fprintf ppf "Op code %d is not valid for this ZK Rollup" oc)
Data_encoding.(obj1 (req "op_code" int31))
(function Zk_rollup_invalid_op_code oc -> Some oc | _ -> None)
(fun oc -> Zk_rollup_invalid_op_code oc) ;
register_error_kind
`Temporary
~id:"zk_rollup_pending_list_too_short"
~title:"Pending list is too short"
~description:"Pending list is too short"
Data_encoding.unit
(function Zk_rollup_pending_list_too_short -> Some () | _ -> None)
(fun () -> Zk_rollup_pending_list_too_short) ;
register_error_kind
`Permanent
~id:"zk_rollup_negative_length"
~title:"Negative length for pending list prefix"
~description:"Negative length for pending list prefix"
Data_encoding.unit
(function Zk_rollup_negative_length -> Some () | _ -> None)
(fun () -> Zk_rollup_negative_length)
let account = Storage.Zk_rollup.Account.get
let pending_list = Storage.Zk_rollup.Pending_list.get
let pending_op ctxt id = Storage.Zk_rollup.Pending_operation.get (ctxt, id)
let originate ctxt static ~init_state =
let open Lwt_result_syntax in
let*? ctxt, nonce = Raw_context.increment_origination_nonce ctxt in
let*? address = Zk_rollup_repr.Address.from_nonce nonce in
let origination_size = Constants_storage.zk_rollup_origination_size ctxt in
let initial_account =
Zk_rollup_account_repr.
{
static;
dynamic =
{
state = init_state;
paid_l2_operations_storage_space = Z.of_int origination_size;
used_l2_operations_storage_space = Z.zero;
};
}
in
let* ctxt, account_size =
Storage.Zk_rollup.Account.init ctxt address initial_account
in
let init_pl = Zk_rollup_repr.(Empty {next_index = 0L}) in
let* ctxt, pl_size =
Storage.Zk_rollup.Pending_list.init ctxt address init_pl
in
let address_size = Zk_rollup_repr.Address.size in
let size =
Z.of_int (origination_size + address_size + account_size + pl_size)
in
return (ctxt, address, size)
let add_to_pending ctxt rollup ops =
let open Lwt_result_syntax in
let open Zk_rollup_repr in
let open Zk_rollup_operation_repr in
let* ctxt, acc = account ctxt rollup in
let*? () =
List.iter_e
(fun (op, _ticket_hash_opt) ->
if Compare.Int.(op.op_code >= acc.static.nb_ops || op.op_code < 0) then
error @@ Zk_rollup_invalid_op_code op.op_code
else ok ())
ops
in
let* ctxt, pl = Storage.Zk_rollup.Pending_list.get ctxt rollup in
let next_index, length =
match pl with
| Empty {next_index} -> (next_index, 0)
| Pending {next_index; length} -> (next_index, length)
in
let* ctxt, next_index, length, storage_diff =
List.fold_left_es
(fun (ctxt, next_index, length, storage_diff) op ->
let* ctxt, new_storage_diff, _was_bound =
Storage.Zk_rollup.Pending_operation.add (ctxt, rollup) next_index op
in
return
( ctxt,
Int64.succ next_index,
length + 1,
new_storage_diff + storage_diff ))
(ctxt, next_index, length, 0)
ops
in
let used_l2_operations_storage_space =
Z.(add acc.dynamic.used_l2_operations_storage_space (Z.of_int storage_diff))
in
let l2_operations_storage_space_to_pay =
Z.(
max
zero
(sub
used_l2_operations_storage_space
acc.dynamic.paid_l2_operations_storage_space))
in
let paid_l2_operations_storage_space =
Z.(
add
acc.dynamic.paid_l2_operations_storage_space
l2_operations_storage_space_to_pay)
in
let acc =
{
acc with
dynamic =
{
acc.dynamic with
paid_l2_operations_storage_space;
used_l2_operations_storage_space;
};
}
in
let pl =
if Compare.Int.(length = 0) then Empty {next_index}
else Pending {next_index; length}
in
(* Users aren't charged for storage diff in the account or pending list
description of a ZKRU.
When updating a ZKRU account, the storage diff can only come from the
dynamically sized [Z.t] used for the watermark. These changes
in storage size will not be accounted for.
As for the pending list description, the storage size is fixed for
each of the two cases (empty / non-empty). Then, there will be a storage
diff when switching between these two, which won't be accounted for
either.
*)
let* ctxt, _diff_acc = Storage.Zk_rollup.Account.update ctxt rollup acc in
let* ctxt, _diff_pl = Storage.Zk_rollup.Pending_list.update ctxt rollup pl in
return (ctxt, l2_operations_storage_space_to_pay)
let pending_length =
let open Zk_rollup_repr in
function Empty _ -> 0 | Pending {length; _} -> length
let head =
let open Zk_rollup_repr in
function
| Empty _ -> error Zk_rollup_pending_list_too_short
| Pending {next_index; length} ->
Result_syntax.return Int64.(sub next_index (of_int length))
let next_index =
let open Zk_rollup_repr in
function
| Empty {next_index} -> next_index | Pending {next_index; _} -> next_index
let get_pending_length ctxt rollup =
let open Lwt_result_syntax in
let* ctxt, pl = pending_list ctxt rollup in
return (ctxt, pending_length pl)
(** Same as [Tezos_stdlib.Utils.fold_n_times] but with Lwt and Error monad *)
let fold_n_times_es ~when_negative n f e =
let open Lwt_result_syntax in
if Compare.Int.(n < 0) then tzfail when_negative
else
let rec go acc = function
| 0 -> return acc
| n ->
let* acc = f acc in
(go [@ocaml.tailcall]) acc (n - 1)
in
go e n
let get_prefix ctxt rollup n =
let open Lwt_result_syntax in
if Compare.Int.(n = 0) then return (ctxt, [])
else
let* ctxt, pl = pending_list ctxt rollup in
let pl_length = pending_length pl in
let*? () =
error_when Compare.Int.(n > pl_length) Zk_rollup_pending_list_too_short
in
let*? hd = head pl in
let* ctxt, ops, _i =
(* Get the l2 ops corresponding to indeces [hd + n - 1 .. hd],
so that the accumulated list is in the right order *)
fold_n_times_es
~when_negative:Zk_rollup_negative_length
n
(fun (ctxt, ops, i) ->
let* ctxt, op = pending_op ctxt rollup i in
return (ctxt, op :: ops, Int64.pred i))
(ctxt, [], Int64.(sub (add hd (of_int n)) 1L))
in
return (ctxt, ops)
let update ctxt rollup ~pending_to_drop ~new_account =
let open Lwt_result_syntax in
let open Zk_rollup_repr in
let open Zk_rollup_account_repr in
let* ctxt, pl = pending_list ctxt rollup in
let* ctxt, acc = account ctxt rollup in
let pl_length = pending_length pl in
let*? () =
error_when
Compare.Int.(pending_to_drop > pl_length)
Zk_rollup_pending_list_too_short
in
let next_index = next_index pl in
(* Drop the indeces from [head] to [head + pending_to_drop - 1]
from the storage of L2 operations. *)
let* ctxt, freed =
match head pl with
| Error _e ->
(* If the pending list is empty, then [pending_to_drop] must be 0. *)
return (ctxt, 0)
| Ok head ->
let* ctxt, freed, _i =
fold_n_times_es
~when_negative:Zk_rollup_negative_length
pending_to_drop
(fun (ctxt, freed, i) ->
let* ctxt, new_freed, _bound =
Storage.Zk_rollup.Pending_operation.remove (ctxt, rollup) i
in
return (ctxt, freed + new_freed, Int64.succ i))
(ctxt, 0, head)
in
return (ctxt, freed)
in
(* Subtract the bytes freed by removing pending operations from
acc.dynamic.used_l2_operations_storage_space, and update
[new_account].
*)
let used_l2_operations_storage_space =
Z.(sub acc.dynamic.used_l2_operations_storage_space (Z.of_int freed))
in
let new_account =
{
new_account with
dynamic =
{
state = new_account.dynamic.state;
paid_l2_operations_storage_space =
new_account.dynamic.paid_l2_operations_storage_space;
used_l2_operations_storage_space;
};
}
in
let* ctxt, _diff_acc =
Storage.Zk_rollup.Account.update ctxt rollup new_account
in
(* Update the pending list descriptor *)
let pl_length = pl_length - pending_to_drop in
let pl =
if Compare.Int.(pl_length = 0) then Empty {next_index}
else Pending {next_index; length = pl_length}
in
let* ctxt, _diff_pl = Storage.Zk_rollup.Pending_list.update ctxt rollup pl in
return ctxt
let assert_exist ctxt rollup =
let open Lwt_result_syntax in
let* ctxt, exists = Storage.Zk_rollup.Account.mem ctxt rollup in
let*? () = error_unless exists (Zk_rollup_does_not_exist rollup) in
return ctxt
let exists ctxt rollup = Storage.Zk_rollup.Account.mem ctxt rollup
