f3555488c7
The single validation module is split in multiple (simpler) modules. In the process, we introduce one "validation worker" per peer. This worker handle all the `New_head` and `New_branch` advertised by a given peer. For so, it sends "fetching request" and "validation request" to respectively the `Distributed_db` and and the `Block_validator`. These two global workers are responsible of the 'fair' allocation of network and CPU ressources amongst the connected 'peers'.
402 lines
16 KiB
OCaml
402 lines
16 KiB
OCaml
(**************************************************************************)
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(* *)
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(* Copyright (c) 2014 - 2017. *)
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(* Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* All rights reserved. No warranty, explicit or implicit, provided. *)
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(* *)
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(**************************************************************************)
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open Logging.Node.Prevalidator
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let list_pendings ?maintain_net_db ~from_block ~to_block old_mempool =
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let rec pop_blocks ancestor block mempool =
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let hash = State.Block.hash block in
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if Block_hash.equal hash ancestor then
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Lwt.return mempool
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else
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State.Block.all_operations block >>= fun operations ->
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Lwt_list.fold_left_s
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(Lwt_list.fold_left_s (fun mempool op ->
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let h = Operation.hash op in
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Lwt_utils.may maintain_net_db
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~f:begin fun net_db ->
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Distributed_db.inject_operation net_db h op >>= fun _ ->
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Lwt.return_unit
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end >>= fun () ->
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Lwt.return (Operation_hash.Set.add h mempool)))
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mempool operations >>= fun mempool ->
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State.Block.predecessor block >>= function
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| None -> assert false
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| Some predecessor -> pop_blocks ancestor predecessor mempool
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in
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let push_block mempool block =
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State.Block.all_operation_hashes block >|= fun operations ->
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iter_option maintain_net_db
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~f:(fun net_db -> Distributed_db.clear_operations net_db operations) ;
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List.fold_left
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(List.fold_left (fun mempool h -> Operation_hash.Set.remove h mempool))
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mempool operations
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in
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Chain_traversal.new_blocks ~from_block ~to_block >>= fun (ancestor, path) ->
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pop_blocks
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(State.Block.hash ancestor)
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from_block old_mempool >>= fun mempool ->
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Lwt_list.fold_left_s push_block mempool path >>= fun new_mempool ->
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Lwt.return new_mempool
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(** Worker *)
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open Prevalidation
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type t = {
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net_db: Distributed_db.net_db ;
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flush: State.Block.t -> unit;
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notify_operations: P2p.Peer_id.t -> Operation_hash.t list -> unit ;
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prevalidate_operations:
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bool -> Operation.t list ->
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(Operation_hash.t list * error preapply_result) tzresult Lwt.t ;
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operations: unit -> error preapply_result * Operation_hash.Set.t ;
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pending: ?block:State.Block.t -> unit -> Operation_hash.Set.t Lwt.t ;
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timestamp: unit -> Time.t ;
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context: unit -> Updater.validation_result tzresult Lwt.t ;
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shutdown: unit -> unit Lwt.t ;
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}
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let merge _key a b =
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match a, b with
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| None, None -> None
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| Some x, None -> Some x
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| _, Some y -> Some y
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let create net_db =
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let net_state = Distributed_db.net_state net_db in
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let cancelation, cancel, _on_cancel = Lwt_utils.canceler () in
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let push_to_worker, worker_waiter = Lwt_utils.queue () in
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Chain.head net_state >>= fun head ->
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let timestamp = ref (Time.now ()) in
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(start_prevalidation ~predecessor:head ~timestamp:!timestamp () >|= ref) >>= fun validation_state ->
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let pending = Operation_hash.Table.create 53 in
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let head = ref head in
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let operations = ref empty_result in
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Chain_traversal.live_blocks
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!head
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(State.Block.max_operations_ttl !head)
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>>= fun (live_blocks, live_operations) ->
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let live_blocks = ref live_blocks in
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let live_operations = ref live_operations in
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let running_validation = ref Lwt.return_unit in
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let unprocessed = ref Operation_hash.Set.empty in
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let broadcast_unprocessed = ref false in
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let set_validation_state state =
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validation_state := state;
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Lwt.return_unit in
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let reset_validation_state head timestamp =
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start_prevalidation ~predecessor:head ~timestamp () >>= fun state ->
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validation_state := state;
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Lwt.return_unit in
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let broadcast_operation ops =
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Distributed_db.Advertise.current_head net_db ~mempool:ops !head in
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let handle_unprocessed () =
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if Operation_hash.Set.is_empty !unprocessed then
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Lwt.return ()
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else
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let ops = !unprocessed in
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let broadcast = !broadcast_unprocessed in
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unprocessed := Operation_hash.Set.empty ;
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broadcast_unprocessed := false ;
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let ops = Operation_hash.Set.diff ops !live_operations in
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live_operations := Operation_hash.Set.(fold add) !live_operations ops ;
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running_validation := begin
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begin
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Lwt_list.filter_map_p
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(fun h ->
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Distributed_db.Operation.read_opt net_db h >>= function
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| Some po when Block_hash.Set.mem po.shell.branch !live_blocks ->
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Lwt.return_some (h, po)
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| Some _ | None -> Lwt.return_none)
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(Operation_hash.Set.elements ops) >>= fun rops ->
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(Lwt.return !validation_state >>=? fun validation_state ->
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(prevalidate validation_state ~sort:true rops >>= return)) >>= function
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| Ok (state, r) -> Lwt.return (Ok state, r)
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| Error err ->
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let r =
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{ empty_result with
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branch_delayed =
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Operation_hash.Set.fold
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(fun op m -> Operation_hash.Map.add op err m)
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ops Operation_hash.Map.empty ; } in
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Lwt.return (!validation_state, r)
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end >>= fun (state, r) ->
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let filter_out s m =
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List.fold_right Operation_hash.Map.remove s m in
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operations := {
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applied = List.rev_append r.applied !operations.applied ;
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refused = Operation_hash.Map.empty ;
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branch_refused =
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Operation_hash.Map.merge merge
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(* filter_out should not be required here, TODO warn ? *)
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(filter_out r.applied !operations.branch_refused)
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r.branch_refused ;
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branch_delayed =
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Operation_hash.Map.merge merge
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(filter_out r.applied !operations.branch_delayed)
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r.branch_delayed ;
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} ;
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Chain.set_reversed_mempool net_state !operations.applied >>= fun () ->
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if broadcast then broadcast_operation r.applied ;
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Lwt_list.iter_s
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(fun (_op, _exns) ->
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(* FIXME *)
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(* Distributed_db.Operation.mark_invalid net_db op exns >>= fun _ -> *)
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Lwt.return_unit)
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(Operation_hash.Map.bindings r.refused) >>= fun () ->
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(* TODO. Keep a bounded set of 'refused' operations. *)
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(* TODO. Log the error in some statistics associated to
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the peers that informed us of the operations. And
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eventually blacklist bad peers. *)
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(* TODO. Keep a bounded set of 'branch_refused' operations
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into the 'state'. It should be associated to the
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current block, and updated on 'set_current_head'. *)
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set_validation_state state
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end;
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Lwt.catch
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(fun () -> !running_validation)
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(fun _ -> lwt_debug "<- prevalidate (cancel)")
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in
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let prevalidation_worker =
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let rec worker_loop () =
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(* TODO lookup in `!pending` for 'outdated' ops and re-add them
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in `unprocessed` (e.g. if the previous tentative was
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more 5 seconds ago) *)
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handle_unprocessed () >>= fun () ->
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Lwt.pick [(worker_waiter () >|= fun q -> `Process q);
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(cancelation () >|= fun () -> `Cancel)] >>= function
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| `Cancel -> Lwt.return_unit
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| `Process q ->
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Lwt_list.iter_s
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(function
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| `Prevalidate (ops, w, force) -> begin
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let result =
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let rops = Operation_hash.Map.bindings ops in
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Lwt.return !validation_state >>=? fun validation_state ->
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prevalidate validation_state
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~sort:true rops >>= fun (state, res) ->
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let register h =
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let op = Operation_hash.Map.find h ops in
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live_operations := Operation_hash.Set.add h !live_operations ;
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Distributed_db.inject_operation
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net_db h op >>=? fun (_ : bool) ->
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return () in
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iter_s
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(fun h ->
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register h >>=? fun () ->
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operations :=
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{ !operations with
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applied = h :: !operations.applied };
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return () )
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res.applied >>=? fun () ->
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Chain.set_reversed_mempool
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net_state !operations.applied >>= fun () ->
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broadcast_operation res.applied ;
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begin
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if force then
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iter_p
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(fun (h, _exns) -> register h)
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(Operation_hash.Map.bindings
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res.branch_delayed) >>=? fun () ->
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iter_p
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(fun (h, _exns) -> register h)
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(Operation_hash.Map.bindings
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res.branch_refused) >>=? fun () ->
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operations :=
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{ !operations with
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branch_delayed =
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Operation_hash.Map.merge merge
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!operations.branch_delayed res.branch_delayed ;
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branch_refused =
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Operation_hash.Map.merge merge
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!operations.branch_refused res.branch_refused ;
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} ;
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return ()
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else
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return ()
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end >>=? fun () ->
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set_validation_state (Ok state) >>= fun () ->
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return res
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in
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result >>= fun result ->
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Lwt.wakeup w result ;
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Lwt.return_unit
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end
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| `Register (gid, ops) ->
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let known_ops, unknown_ops =
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List.partition
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(fun op ->
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Operation_hash.Table.mem pending op
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|| Operation_hash.Set.mem op !live_operations)
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ops in
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let fetch h =
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Distributed_db.Operation.fetch
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~timeout:10. (* TODO allow to adjust the constant ... *)
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net_db ~peer:gid h () >>= function
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| Ok _op ->
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push_to_worker (`Handle h) ;
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Lwt.return_unit
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| Error [ Distributed_db.Operation.Canceled _ ] ->
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lwt_debug
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"operation %a included before being prevalidated"
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Operation_hash.pp_short h >>= fun () ->
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Operation_hash.Table.remove pending h ;
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Lwt.return_unit
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| Error _ ->
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Operation_hash.Table.remove pending h ;
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Lwt.return_unit
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in
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List.iter
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(fun op -> Operation_hash.Table.add pending op (fetch op))
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unknown_ops ;
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List.iter (fun op ->
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Lwt.ignore_result
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(Distributed_db.Operation.fetch
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(* TODO allow to adjust the constant ... *)
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~timeout:10.
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net_db ~peer:gid op ()))
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known_ops ;
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Lwt.return_unit
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| `Handle op ->
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lwt_debug "register %a" Operation_hash.pp_short op >>= fun () ->
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Operation_hash.Table.remove pending op ;
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broadcast_unprocessed := true ;
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unprocessed := Operation_hash.Set.singleton op ;
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lwt_debug "register %a" Operation_hash.pp_short op >>= fun () ->
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Lwt.return_unit
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| `Flush (new_head : State.Block.t) ->
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list_pendings
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~maintain_net_db:net_db
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~from_block:!head ~to_block:new_head
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(preapply_result_operations !operations) >>= fun new_mempool ->
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Chain_traversal.live_blocks
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new_head
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(State.Block.max_operations_ttl new_head)
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>>= fun (new_live_blocks, new_live_operations) ->
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lwt_debug "flush %a (mempool: %d)"
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Block_hash.pp_short (State.Block.hash new_head)
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(Operation_hash.Set.cardinal new_mempool) >>= fun () ->
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(* Reset the pre-validation context *)
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head := new_head ;
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operations := empty_result ;
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broadcast_unprocessed := false ;
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unprocessed := new_mempool ;
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timestamp := Time.now () ;
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live_blocks := new_live_blocks ;
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live_operations := new_live_operations ;
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(* Reset the prevalidation context. *)
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reset_validation_state new_head !timestamp)
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q >>= fun () ->
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worker_loop ()
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in
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Lwt_utils.worker
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(Format.asprintf "prevalidator.%a"
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Net_id.pp (State.Net.id net_state))
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~run:worker_loop ~cancel in
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let flush head =
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push_to_worker (`Flush head) ;
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if not (Lwt.is_sleeping !running_validation) then
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Lwt.cancel !running_validation
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in
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let notify_operations gid ops =
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Lwt.async begin fun () ->
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push_to_worker (`Register (gid, ops)) ;
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Lwt.return_unit
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end in
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let prevalidate_operations force raw_ops =
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let ops = List.map Operation.hash raw_ops in
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let ops_map =
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List.fold_left
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(fun map op ->
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Operation_hash.Map.add (Operation.hash op) op map)
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Operation_hash.Map.empty raw_ops in
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let wait, waker = Lwt.wait () in
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push_to_worker (`Prevalidate (ops_map, waker, force));
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wait >>=? fun result ->
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return (ops, result) in
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let shutdown () =
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lwt_debug "shutdown" >>= fun () ->
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if not (Lwt.is_sleeping !running_validation) then
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Lwt.cancel !running_validation;
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cancel () >>= fun () ->
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prevalidation_worker in
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let pending ?block () =
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let ops = preapply_result_operations !operations in
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match block with
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| None -> Lwt.return ops
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| Some to_block -> list_pendings ~from_block:!head ~to_block ops in
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let context () =
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Lwt.return !validation_state >>=? fun prevalidation_state ->
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Prevalidation.end_prevalidation prevalidation_state in
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Lwt.return {
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net_db ;
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flush ;
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notify_operations ;
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prevalidate_operations ;
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operations =
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(fun () ->
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{ !operations with applied = List.rev !operations.applied },
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!unprocessed) ;
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pending ;
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timestamp = (fun () -> !timestamp) ;
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context ;
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shutdown ;
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}
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let flush pv head = pv.flush head
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let notify_operations pv = pv.notify_operations
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let prevalidate_operations pv = pv.prevalidate_operations
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let operations pv = pv.operations ()
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let pending ?block pv = pv.pending ?block ()
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let timestamp pv = pv.timestamp ()
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let context pv = pv.context ()
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let shutdown pv = pv.shutdown ()
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let inject_operation pv ?(force = false) (op: Operation.t) =
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let net_id = State.Net.id (Distributed_db.net_state pv.net_db) in
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let wrap_error h map =
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begin
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try return (Operation_hash.Map.find h map)
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with Not_found ->
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failwith "unexpected protocol result"
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end >>=? fun errors ->
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Lwt.return (Error errors) in
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fail_unless (Net_id.equal net_id op.shell.net_id)
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(failure
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"Prevalidator.inject_operation: invalid network") >>=? fun () ->
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pv.prevalidate_operations force [op] >>=? function
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| ([h], { applied = [h'] }) when Operation_hash.equal h h' ->
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return ()
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| ([h], { refused })
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when Operation_hash.Map.cardinal refused = 1 ->
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wrap_error h refused
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| ([h], { branch_refused })
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when Operation_hash.Map.cardinal branch_refused = 1 && not force ->
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wrap_error h branch_refused
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| ([h], { branch_delayed })
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when Operation_hash.Map.cardinal branch_delayed = 1 && not force ->
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wrap_error h branch_delayed
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| _ ->
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if force then
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return ()
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else
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failwith "Unexpected result for prevalidation."
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