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head_sync.go
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head_sync.go
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// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package sync
import (
"github.com/Pond-International/go-ethereum/beacon/light/request"
"github.com/Pond-International/go-ethereum/beacon/types"
)
type headTracker interface {
ValidateHead(head types.SignedHeader) (bool, error)
ValidateFinality(head types.FinalityUpdate) (bool, error)
SetPrefetchHead(head types.HeadInfo)
}
// HeadSync implements request.Module; it updates the validated and prefetch
// heads of HeadTracker based on the EvHead and EvSignedHead events coming from
// registered servers.
// It can also postpone the validation of the latest announced signed head
// until the committee chain is synced up to at least the required period.
type HeadSync struct {
headTracker headTracker
chain committeeChain
nextSyncPeriod uint64
chainInit bool
unvalidatedHeads map[request.Server]types.SignedHeader
unvalidatedFinality map[request.Server]types.FinalityUpdate
serverHeads map[request.Server]types.HeadInfo
headServerCount map[types.HeadInfo]headServerCount
headCounter uint64
prefetchHead types.HeadInfo
}
// headServerCount is associated with most recently seen head infos; it counts
// the number of servers currently having the given head info as their announced
// head and a counter signaling how recent that head is.
// This data is used for selecting the prefetch head.
type headServerCount struct {
serverCount int
headCounter uint64
}
// NewHeadSync creates a new HeadSync.
func NewHeadSync(headTracker headTracker, chain committeeChain) *HeadSync {
s := &HeadSync{
headTracker: headTracker,
chain: chain,
unvalidatedHeads: make(map[request.Server]types.SignedHeader),
unvalidatedFinality: make(map[request.Server]types.FinalityUpdate),
serverHeads: make(map[request.Server]types.HeadInfo),
headServerCount: make(map[types.HeadInfo]headServerCount),
}
return s
}
// Process implements request.Module.
func (s *HeadSync) Process(requester request.Requester, events []request.Event) {
for _, event := range events {
switch event.Type {
case EvNewHead:
s.setServerHead(event.Server, event.Data.(types.HeadInfo))
case EvNewSignedHead:
s.newSignedHead(event.Server, event.Data.(types.SignedHeader))
case EvNewFinalityUpdate:
s.newFinalityUpdate(event.Server, event.Data.(types.FinalityUpdate))
case request.EvUnregistered:
s.setServerHead(event.Server, types.HeadInfo{})
delete(s.serverHeads, event.Server)
delete(s.unvalidatedHeads, event.Server)
}
}
nextPeriod, chainInit := s.chain.NextSyncPeriod()
if nextPeriod != s.nextSyncPeriod || chainInit != s.chainInit {
s.nextSyncPeriod, s.chainInit = nextPeriod, chainInit
s.processUnvalidated()
}
}
// newSignedHead handles received signed head; either validates it if the chain
// is properly synced or stores it for further validation.
func (s *HeadSync) newSignedHead(server request.Server, signedHead types.SignedHeader) {
if !s.chainInit || types.SyncPeriod(signedHead.SignatureSlot) > s.nextSyncPeriod {
s.unvalidatedHeads[server] = signedHead
return
}
s.headTracker.ValidateHead(signedHead)
}
// newSignedHead handles received signed head; either validates it if the chain
// is properly synced or stores it for further validation.
func (s *HeadSync) newFinalityUpdate(server request.Server, finalityUpdate types.FinalityUpdate) {
if !s.chainInit || types.SyncPeriod(finalityUpdate.SignatureSlot) > s.nextSyncPeriod {
s.unvalidatedFinality[server] = finalityUpdate
return
}
s.headTracker.ValidateFinality(finalityUpdate)
}
// processUnvalidatedHeads iterates the list of unvalidated heads and validates
// those which can be validated.
func (s *HeadSync) processUnvalidated() {
if !s.chainInit {
return
}
for server, signedHead := range s.unvalidatedHeads {
if types.SyncPeriod(signedHead.SignatureSlot) <= s.nextSyncPeriod {
s.headTracker.ValidateHead(signedHead)
delete(s.unvalidatedHeads, server)
}
}
for server, finalityUpdate := range s.unvalidatedFinality {
if types.SyncPeriod(finalityUpdate.SignatureSlot) <= s.nextSyncPeriod {
s.headTracker.ValidateFinality(finalityUpdate)
delete(s.unvalidatedFinality, server)
}
}
}
// setServerHead processes non-validated server head announcements and updates
// the prefetch head if necessary.
func (s *HeadSync) setServerHead(server request.Server, head types.HeadInfo) bool {
if oldHead, ok := s.serverHeads[server]; ok {
if head == oldHead {
return false
}
h := s.headServerCount[oldHead]
if h.serverCount--; h.serverCount > 0 {
s.headServerCount[oldHead] = h
} else {
delete(s.headServerCount, oldHead)
}
}
if head != (types.HeadInfo{}) {
h, ok := s.headServerCount[head]
if !ok {
s.headCounter++
h.headCounter = s.headCounter
}
h.serverCount++
s.headServerCount[head] = h
s.serverHeads[server] = head
} else {
delete(s.serverHeads, server)
}
var (
bestHead types.HeadInfo
bestHeadInfo headServerCount
)
for head, headServerCount := range s.headServerCount {
if headServerCount.serverCount > bestHeadInfo.serverCount ||
(headServerCount.serverCount == bestHeadInfo.serverCount && headServerCount.headCounter > bestHeadInfo.headCounter) {
bestHead, bestHeadInfo = head, headServerCount
}
}
if bestHead == s.prefetchHead {
return false
}
s.prefetchHead = bestHead
s.headTracker.SetPrefetchHead(bestHead)
return true
}