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eth/fetcher: if peers never respond, drop them #837

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merged 1 commit into from
Apr 27, 2023
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eth/fetcher: if peers never respond, drop them #837

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39 changes: 31 additions & 8 deletions eth/fetcher/block_fetcher.go
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Original file line number Diff line number Diff line change
Expand Up @@ -477,10 +477,21 @@ func (f *BlockFetcher) loop() {
}
defer req.Close()

res := <-resCh
res.Done <- nil

f.FilterHeaders(peer, *res.Res.(*eth.BlockHeadersPacket), time.Now().Add(res.Time))
timeout := time.NewTimer(2 * fetchTimeout) // 2x leeway before dropping the peer
defer timeout.Stop()

select {
case res := <-resCh:
res.Done <- nil
f.FilterHeaders(peer, *res.Res.(*eth.BlockHeadersPacket), time.Now().Add(res.Time))

case <-timeout.C:
// The peer didn't respond in time. The request
// was already rescheduled at this point, we were
// waiting for a catchup. With an unresponsive
// peer however, it's a protocol violation.
f.dropPeer(peer)
}
}(hash)
}
}(peer)
Expand Down Expand Up @@ -523,11 +534,23 @@ func (f *BlockFetcher) loop() {
}
defer req.Close()

res := <-resCh
res.Done <- nil
timeout := time.NewTimer(2 * fetchTimeout) // 2x leeway before dropping the peer
defer timeout.Stop()

select {
case res := <-resCh:
res.Done <- nil

txs, uncles := res.Res.(*eth.BlockBodiesPacket).Unpack()
f.FilterBodies(peer, txs, uncles, time.Now())
txs, uncles := res.Res.(*eth.BlockBodiesPacket).Unpack()
f.FilterBodies(peer, txs, uncles, time.Now())

case <-timeout.C:
// The peer didn't respond in time. The request
// was already rescheduled at this point, we were
// waiting for a catchup. With an unresponsive
// peer however, it's a protocol violation.
f.dropPeer(peer)
}
}(peer, hashes)
}
// Schedule the next fetch if blocks are still pending
Expand Down