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Node: only validate branches that can increase the current head's fitness

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And also make the check when processing new head increments. That way
we prevent spamming with valid head successors that bear the same
fitness.
This commit is contained in:
Benjamin Canou 2018-01-03 16:56:38 +01:00 committed by Grégoire Henry
parent 41ad73a3ed
commit 9060122b26
1 changed files with 27 additions and 23 deletions
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32
src/lib_node_shell/peer_validator.ml
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@ -159,6 +159,22 @@ let validate_new_head w hash (header : Block_header.t) =
set_bootstrapped pv ;
return ()
let only_if_fitness_increases w distant_header cont =
let pv = Worker.state w in
let net_state = Distributed_db.net_state pv.parameters.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 ;
debug w
"ignoring head %a with non increasing fitness from peer: %a."
Block_hash.pp_short (Block_header.hash distant_header)
P2p.Peer_id.pp_short pv.peer_id ;
(* Don't download a branch that cannot beat the current head. *)
return ()
end else cont ()
let may_validate_new_head w hash header =
let pv = Worker.state w in
let net_state = Distributed_db.net_state pv.parameters.net_db in
@ -181,24 +197,13 @@ let may_validate_new_head w hash header =
fail Known_invalid
end
| false ->
only_if_fitness_increases w header @@ fun () ->
validate_new_head w hash header
let may_validate_new_branch w distant_hash locator =
let pv = Worker.state w in
let distant_header, _ = (locator : Block_locator.t :> Block_header.t * _) in
let net_state = Distributed_db.net_state pv.parameters.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 ;
debug w
"ignoring branch %a with low fitness from peer: %a."
Block_hash.pp_short distant_hash
P2p.Peer_id.pp_short pv.peer_id ;
(* Don't bother with downloading a branch with a low fitness. *)
return ()
end else begin
only_if_fitness_increases w distant_header @@ fun () ->
let net_state = Distributed_db.net_state pv.parameters.net_db in
Block_locator_iterator.known_ancestor net_state locator >>= function
| None ->
@ -209,7 +214,6 @@ let may_validate_new_branch w distant_hash locator =
fail Unknown_ancestor
| Some (ancestor, unknown_prefix) ->
bootstrap_new_branch w ancestor distant_header unknown_prefix
end
let on_no_request w =
let pv = Worker.state w in