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les: fix light fetcher database race

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This commit is contained in:
Zsolt Felfoldi 2018-02-15 18:08:39 +01:00
parent 4e61ed02e2
commit 055eb26ae8
1 changed files with 14 additions and 4 deletions
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18
les/fetcher.go
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@ -46,7 +46,7 @@ type lightFetcher struct {
peers map[*peer]*fetcherPeerInfo
lastUpdateStats *updateStatsEntry
lock sync.Mutex // qwerqwerqwe
lock sync.Mutex
deliverChn chan fetchResponse
reqMu sync.RWMutex
requested map[uint64]fetchRequest
@ -560,8 +560,13 @@ func (f *lightFetcher) checkAnnouncedHeaders(fp *fetcherPeerInfo, headers []*typ
return true
}
// we ran out of recently delivered headers but have not reached a node known by this peer yet, continue matching
td = f.chain.GetTd(header.ParentHash, header.Number.Uint64()-1)
header = f.chain.GetHeader(header.ParentHash, header.Number.Uint64()-1)
hash, number := header.ParentHash, header.Number.Uint64()-1
td = f.chain.GetTd(hash, number)
header = f.chain.GetHeader(hash, number)
if header == nil || td == nil {
log.Error("Missing parent of validated header", "hash", hash, "number", number)
return false
}
} else {
header = headers[i]
td = tds[i]
@ -645,13 +650,18 @@ func (f *lightFetcher) checkKnownNode(p *peer, n *fetcherTreeNode) bool {
if td == nil {
return false
}
header := f.chain.GetHeader(n.hash, n.number)
// check the availability of both header and td because reads are not protected by chain db mutex
// Note: returning false is always safe here
if header == nil {
return false
}
fp := f.peers[p]
if fp == nil {
p.Log().Debug("Unknown peer to check known nodes")
return false
}
header := f.chain.GetHeader(n.hash, n.number)
if !f.checkAnnouncedHeaders(fp, []*types.Header{header}, []*big.Int{td}) {
p.Log().Debug("Inconsistent announcement")
go f.pm.removePeer(p.id)