51 lines
2.1 KiB
Nim
51 lines
2.1 KiB
Nim
# beacon_chain
|
|
# Copyright (c) 2022-2023 Status Research & Development GmbH
|
|
# Licensed and distributed under either of
|
|
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
|
|
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
|
|
# at your option. This file may not be copied, modified, or distributed except according to those terms.
|
|
|
|
{.push raises: [].}
|
|
|
|
import
|
|
std/typetraits,
|
|
chronos,
|
|
stew/base10,
|
|
../spec/[forks_light_client, network]
|
|
|
|
func checkLightClientUpdates*(
|
|
updates: openArray[ForkedLightClientUpdate],
|
|
startPeriod: SyncCommitteePeriod,
|
|
count: uint64): Result[void, string] =
|
|
if updates.lenu64 > count:
|
|
return err("Too many values in response" &
|
|
" (" & Base10.toString(updates.lenu64) &
|
|
" > " & Base10.toString(count.uint) & ")")
|
|
let lastPeriod = startPeriod + count - 1
|
|
var expectedPeriod = startPeriod
|
|
for update in updates:
|
|
withForkyUpdate(update):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
let
|
|
attPeriod =
|
|
forkyUpdate.attested_header.beacon.slot.sync_committee_period
|
|
sigPeriod = forkyUpdate.signature_slot.sync_committee_period
|
|
if attPeriod != sigPeriod:
|
|
return err("Conflicting sync committee periods" &
|
|
" (signature: " & Base10.toString(distinctBase(sigPeriod)) &
|
|
" != " & Base10.toString(distinctBase(attPeriod)) & ")")
|
|
if attPeriod < expectedPeriod:
|
|
return err("Unexpected sync committee period" &
|
|
" (" & Base10.toString(distinctBase(attPeriod)) &
|
|
" < " & Base10.toString(distinctBase(expectedPeriod)) & ")")
|
|
if attPeriod > expectedPeriod:
|
|
if attPeriod > lastPeriod:
|
|
return err("Sync committee period too high" &
|
|
" (" & Base10.toString(distinctBase(attPeriod)) &
|
|
" > " & Base10.toString(distinctBase(lastPeriod)) & ")")
|
|
expectedPeriod = attPeriod
|
|
inc expectedPeriod
|
|
else:
|
|
return err("Invalid context bytes")
|
|
ok()
|