307 lines
11 KiB
OCaml
307 lines
11 KiB
OCaml
(**************************************************************************)
|
|
(* *)
|
|
(* Copyright (c) 2014 - 2017. *)
|
|
(* Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
|
|
(* *)
|
|
(* All rights reserved. No warranty, explicit or implicit, provided. *)
|
|
(* *)
|
|
(**************************************************************************)
|
|
|
|
(* FIXME ignore/postpone fetching/validating of block in the future... *)
|
|
|
|
include Logging.Make(struct let name = "node.validator.peer" end)
|
|
|
|
type msg =
|
|
| New_head of Block_hash.t * Block_header.t
|
|
| New_branch of Block_hash.t * Block_locator.t
|
|
|
|
type t = {
|
|
|
|
peer_id: P2p.Peer_id.t ;
|
|
net_db: Distributed_db.net_db ;
|
|
block_validator: Block_validator.t ;
|
|
|
|
new_head_request_timeout: float ;
|
|
block_header_timeout: float ;
|
|
block_operations_timeout: float ;
|
|
protocol_timeout: float ;
|
|
|
|
(* callback to net_validator *)
|
|
notify_new_block: State.Block.t -> unit ;
|
|
notify_bootstrapped: unit -> unit ;
|
|
|
|
mutable bootstrapped: bool ;
|
|
mutable last_validated_head: Block_header.t ;
|
|
mutable last_advertised_head: Block_header.t ;
|
|
|
|
mutable worker: unit Lwt.t ;
|
|
dropbox: msg Lwt_dropbox.t ;
|
|
canceler: Lwt_canceler.t ;
|
|
|
|
}
|
|
|
|
type error +=
|
|
| Unknown_ancestor
|
|
| Known_invalid
|
|
|
|
let set_bootstrapped pv =
|
|
if not pv.bootstrapped then begin
|
|
pv.bootstrapped <- true ;
|
|
pv.notify_bootstrapped () ;
|
|
end
|
|
|
|
let bootstrap_new_branch pv _ancestor _head unknown_prefix =
|
|
let len = Block_locator_iterator.estimated_length unknown_prefix in
|
|
lwt_log_info
|
|
"validating new branch from peer %a (approx. %d blocks)"
|
|
P2p.Peer_id.pp_short pv.peer_id len >>= fun () ->
|
|
let pipeline =
|
|
Bootstrap_pipeline.create
|
|
~notify_new_block:pv.notify_new_block
|
|
~block_header_timeout:pv.block_header_timeout
|
|
~block_operations_timeout:pv.block_operations_timeout
|
|
pv.block_validator
|
|
pv.peer_id pv.net_db unknown_prefix in
|
|
Lwt_utils.protect ~canceler:pv.canceler
|
|
~on_error:begin fun error ->
|
|
(* if the peer_validator is killed, let's cancel the pipeline *)
|
|
Bootstrap_pipeline.cancel pipeline >>= fun () ->
|
|
Lwt.return_error error
|
|
end
|
|
begin fun () ->
|
|
Bootstrap_pipeline.wait pipeline
|
|
end >>=? fun () ->
|
|
set_bootstrapped pv ;
|
|
lwt_log_info
|
|
"done validating new branch from peer %a."
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
return ()
|
|
|
|
let validate_new_head pv hash (header : Block_header.t) =
|
|
let net_state = Distributed_db.net_state pv.net_db in
|
|
State.Block.known net_state header.shell.predecessor >>= function
|
|
| false ->
|
|
lwt_debug
|
|
"missing predecessor for new head %a from peer %a"
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
Distributed_db.Request.current_branch pv.net_db ~peer:pv.peer_id () ;
|
|
return ()
|
|
| true ->
|
|
lwt_debug
|
|
"fetching operations for new head %a from peer %a"
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
map_p
|
|
(fun i ->
|
|
Lwt_utils.protect ~canceler:pv.canceler begin fun () ->
|
|
Distributed_db.Operations.fetch
|
|
~timeout:pv.block_operations_timeout
|
|
pv.net_db ~peer:pv.peer_id
|
|
(hash, i) header.shell.operations_hash
|
|
end)
|
|
(0 -- (header.shell.validation_passes - 1)) >>=? fun operations ->
|
|
lwt_debug
|
|
"requesting validation for new head %a from peer %a"
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
Block_validator.validate
|
|
~notify_new_block:pv.notify_new_block
|
|
pv.block_validator pv.net_db
|
|
hash header operations >>=? fun _block ->
|
|
lwt_debug "end of validation for new head %a from peer %a"
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
set_bootstrapped pv ;
|
|
return ()
|
|
|
|
let may_validate_new_head pv hash header =
|
|
let net_state = Distributed_db.net_state pv.net_db in
|
|
State.Block.known net_state hash >>= function
|
|
| true -> begin
|
|
State.Block.known_valid net_state hash >>= function
|
|
| true ->
|
|
lwt_debug
|
|
"ignoring previously validated block %a from peer %a"
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
set_bootstrapped pv ;
|
|
pv.last_validated_head <- header ;
|
|
return ()
|
|
| false ->
|
|
lwt_log_info
|
|
"ignoring known invalid block %a from peer %a"
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
fail Known_invalid
|
|
end
|
|
| false ->
|
|
validate_new_head pv hash header
|
|
|
|
let may_validate_new_branch pv distant_hash locator =
|
|
let distant_header, _ = (locator : Block_locator.t :> Block_header.t * _) in
|
|
let net_state = Distributed_db.net_state pv.net_db in
|
|
Chain.head net_state >>= fun local_header ->
|
|
if Fitness.compare
|
|
distant_header.Block_header.shell.fitness
|
|
(State.Block.fitness local_header) < 0 then begin
|
|
set_bootstrapped pv ;
|
|
lwt_debug
|
|
"ignoring branch %a with low fitness from peer: %a."
|
|
Block_hash.pp_short distant_hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
(* Don't bother with downloading a branch with a low fitness. *)
|
|
return ()
|
|
end else begin
|
|
let net_state = Distributed_db.net_state pv.net_db in
|
|
Block_locator_iterator.known_ancestor net_state locator >>= function
|
|
| None ->
|
|
lwt_log_info
|
|
"ignoring branch %a without common ancestor from peer: %a."
|
|
Block_hash.pp_short distant_hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
fail Unknown_ancestor
|
|
| Some (ancestor, unknown_prefix) ->
|
|
bootstrap_new_branch pv ancestor distant_header unknown_prefix
|
|
end
|
|
|
|
let rec worker_loop pv =
|
|
begin
|
|
Lwt_utils.protect ~canceler:pv.canceler begin fun () ->
|
|
Lwt_dropbox.take_with_timeout
|
|
pv.new_head_request_timeout
|
|
pv.dropbox >>= return
|
|
end >>=? function
|
|
| None ->
|
|
lwt_log_info "no new head from peer %a for 90 seconds."
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
Distributed_db.Request.current_head pv.net_db ~peer:pv.peer_id () ;
|
|
return ()
|
|
| Some (New_head (hash, header)) ->
|
|
lwt_log_info "processing new head %a from peer %a."
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
may_validate_new_head pv hash header
|
|
| Some (New_branch (hash, locator)) ->
|
|
(* TODO penalize empty locator... ?? *)
|
|
lwt_log_info "processing new branch %a from peer %a."
|
|
Block_hash.pp_short hash
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
may_validate_new_branch pv hash locator
|
|
end >>= function
|
|
| Ok () ->
|
|
worker_loop pv
|
|
| Error ((( Unknown_ancestor
|
|
| Bootstrap_pipeline.Invalid_locator _
|
|
| Block_validator.Invalid_block _ ) :: _) as errors ) ->
|
|
(* TODO ban the peer_id... *)
|
|
lwt_log_info "Terminating the validation worker for peer %a (kickban)."
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
lwt_debug "%a" Error_monad.pp_print_error errors >>= fun () ->
|
|
Lwt_canceler.cancel pv.canceler >>= fun () ->
|
|
Lwt.return_unit
|
|
| Error [Block_validator.Unavailable_protocol { protocol } ] -> begin
|
|
Block_validator.fetch_and_compile_protocol
|
|
pv.block_validator
|
|
~peer:pv.peer_id
|
|
~timeout:pv.protocol_timeout
|
|
protocol >>= function
|
|
| Ok _ -> worker_loop pv
|
|
| Error _ ->
|
|
(* TODO penality... *)
|
|
lwt_log_info "Terminating the validation worker for peer %a \
|
|
\ (missing protocol %a)."
|
|
P2p.Peer_id.pp_short pv.peer_id
|
|
Protocol_hash.pp_short protocol >>= fun () ->
|
|
Lwt_canceler.cancel pv.canceler >>= fun () ->
|
|
Lwt.return_unit
|
|
end
|
|
| Error [Exn Lwt.Canceled | Lwt_utils.Canceled | Exn Lwt_dropbox.Closed] ->
|
|
lwt_log_info "Terminating the validation worker for peer %a."
|
|
P2p.Peer_id.pp_short pv.peer_id >>= fun () ->
|
|
Lwt.return_unit
|
|
| Error err ->
|
|
lwt_log_error
|
|
"@[<v 2>Unexpected error in the validation worker for peer %a:@ \
|
|
\ %a@]"
|
|
P2p.Peer_id.pp_short pv.peer_id
|
|
pp_print_error err >>= fun () ->
|
|
Lwt_canceler.cancel pv.canceler >>= fun () ->
|
|
Lwt.return_unit
|
|
|
|
let create
|
|
?notify_new_block:(external_notify_new_block = fun _ -> ())
|
|
?(notify_bootstrapped = fun () -> ())
|
|
?(notify_termination = fun _ -> ())
|
|
~new_head_request_timeout
|
|
~block_header_timeout
|
|
~block_operations_timeout
|
|
~protocol_timeout
|
|
block_validator net_db peer_id =
|
|
lwt_debug "creating validator for peer %a."
|
|
P2p.Peer_id.pp_short peer_id >>= fun () ->
|
|
let canceler = Lwt_canceler.create () in
|
|
let dropbox = Lwt_dropbox.create () in
|
|
let net_state = Distributed_db.net_state net_db in
|
|
State.Block.read_exn net_state
|
|
(State.Net.genesis net_state).block >>= fun genesis ->
|
|
let rec notify_new_block block =
|
|
pv.last_validated_head <- State.Block.header block ;
|
|
external_notify_new_block block
|
|
and pv = {
|
|
block_validator ;
|
|
notify_new_block ;
|
|
notify_bootstrapped ;
|
|
new_head_request_timeout ;
|
|
block_header_timeout ;
|
|
block_operations_timeout ;
|
|
protocol_timeout ;
|
|
net_db ;
|
|
peer_id ;
|
|
bootstrapped = false ;
|
|
last_validated_head = State.Block.header genesis ;
|
|
last_advertised_head = State.Block.header genesis ;
|
|
canceler ;
|
|
dropbox ;
|
|
worker = Lwt.return_unit ;
|
|
} in
|
|
Lwt_canceler.on_cancel pv.canceler begin fun () ->
|
|
Lwt_dropbox.close pv.dropbox ;
|
|
Distributed_db.disconnect pv.net_db pv.peer_id >>= fun () ->
|
|
notify_termination pv ;
|
|
Lwt.return_unit
|
|
end ;
|
|
pv.worker <-
|
|
Lwt_utils.worker
|
|
(Format.asprintf "peer_validator.%a.%a"
|
|
Net_id.pp (State.Net.id net_state) P2p.Peer_id.pp_short peer_id)
|
|
~run:(fun () -> worker_loop pv)
|
|
~cancel:(fun () -> Lwt_canceler.cancel pv.canceler) ;
|
|
Lwt.return pv
|
|
|
|
let notify_branch pv locator =
|
|
let header, _ = (locator : Block_locator.t :> _ * _) in
|
|
let hash = Block_header.hash header in
|
|
(* TODO penalize decreasing fitness *)
|
|
pv.last_advertised_head <- header ;
|
|
try Lwt_dropbox.put pv.dropbox (New_branch (hash, locator))
|
|
with Lwt_dropbox.Closed -> ()
|
|
|
|
let notify_head pv header =
|
|
let hash = Block_header.hash header in
|
|
pv.last_advertised_head <- header ;
|
|
(* TODO penalize decreasing fitness *)
|
|
match Lwt_dropbox.peek pv.dropbox with
|
|
| Some (New_branch _) -> () (* ignore *)
|
|
| None | Some (New_head _) ->
|
|
try Lwt_dropbox.put pv.dropbox (New_head (hash, header))
|
|
with Lwt_dropbox.Closed -> ()
|
|
|
|
let shutdown pv =
|
|
Lwt_canceler.cancel pv.canceler >>= fun () ->
|
|
pv.worker
|
|
|
|
let peer_id pv = pv.peer_id
|
|
let bootstrapped pv = pv.bootstrapped
|
|
let current_head pv = pv.last_validated_head
|