prevalidator_pending_operations.ml
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(* FIXME: https://gitlab.com/tezos/tezos/-/issues/4113
This file is part of the implementation of the new mempool, which
uses features of the protocol that only exist since Lima.
When you modify this file, consider whether you should also change
the files that implement the legacy mempool for Kathmandu. They all
start with the "legacy" prefix and will be removed when Lima is
activated on Mainnet. *)
(* Ordering is important, as it is used below in map keys comparison *)
type priority = [`High | `Medium | `Low of Q.t list]
module Priority_map : Map.S with type key = priority = Map.Make (struct
type t = priority
module CompareListQ = Compare.List (Q)
let compare_low_prio p1 p2 =
(* A higher priority operation should appear before in the map. So we use
the pointwise comparison of p2 and p1 *)
CompareListQ.compare p2 p1
let compare p1 p2 =
(* - Explicit comparison, `High is smaller,
- Avoid fragile patterns in case the type is extended in the future *)
match (p1, p2) with
| `High, `High | `Medium, `Medium -> 0
| `Low p1, `Low p2 -> compare_low_prio p1 p2
| `High, (`Low _ | `Medium) -> -1
| (`Low _ | `Medium), `High -> 1
| `Low _, `Medium -> 1
| `Medium, `Low _ -> -1
end)
module Map = Operation_hash.Map
module Sized_set = Tezos_base.Sized.MakeSizedSet (Operation_hash.Set)
(*
The type below is used for representing pending operations data of the
prevalidator. The functions of this module (should) maintain the
following invariants:
1 - Union (preimage(pending(prio))) = hashes, for each prio in dom(pending)
2 - preimage (priority_of) = hashes
3 - image(priority_of) = preimage (pending)
4 - map in pending(priority) => map <> empty
*)
type 'a t = {
(* The main map *)
pending : 'a Prevalidation.operation Map.t Priority_map.t;
(* Used for advertising *)
hashes : Sized_set.t;
(* We need to remember the priority of each hash, to be used when removing
without providing the priority *)
priority_of : priority Map.t;
}
let empty =
{
pending = Priority_map.empty;
hashes = Sized_set.empty;
priority_of = Map.empty;
}
let is_empty {pending = _; priority_of = _; hashes} = Sized_set.is_empty hashes
let hashes {pending = _; priority_of = _; hashes} = Sized_set.to_set hashes
let operations {pending; priority_of = _; hashes = _} =
(* Build a flag map [oph -> op] from pending. Needed when re-cycling
operations *)
Priority_map.fold
(fun _prio -> Map.union (fun _ _ b -> Some b))
pending
Map.empty
let mem oph {hashes; priority_of = _; pending = _} = Sized_set.mem oph hashes
let get_priority_map prio pending =
match Priority_map.find prio pending with None -> Map.empty | Some mp -> mp
let add op prio {pending; hashes; priority_of} =
let oph = op.Prevalidation.hash in
let mp = get_priority_map prio pending |> Map.add oph op in
{
pending = Priority_map.add prio mp pending;
hashes = Sized_set.add oph hashes;
priority_of = Map.add oph prio priority_of;
}
let remove oph ({pending; hashes; priority_of} as t) =
match Map.find oph priority_of with
| None -> t
| Some prio ->
let mp = get_priority_map prio pending |> Map.remove oph in
{
pending =
(if Map.is_empty mp then Priority_map.remove prio pending
else Priority_map.add prio mp pending);
hashes = Sized_set.remove oph hashes;
priority_of = Map.remove oph priority_of;
}
let cardinal {pending = _; hashes; priority_of = _} = Sized_set.cardinal hashes
let fold_es f {pending; hashes = _; priority_of = _} acc =
Priority_map.fold_es
(fun prio mp acc -> Map.fold_es (f prio) mp acc)
pending
acc
let fold f {pending; hashes = _; priority_of = _} acc =
Priority_map.fold (fun prio mp acc -> Map.fold (f prio) mp acc) pending acc
let iter f {pending; hashes = _; priority_of = _} =
Priority_map.iter (fun prio mp -> Map.iter (f prio) mp) pending