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eth/downloader: drop beacon head updates if the syncer is restarting (#27397)

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* eth/downloader: drop beacon head updates if the syncer is restarting

* eth/donwloader: v2 of the goroutine spike preventer
This commit is contained in:
Péter Szilágyi 2023-06-05 09:59:38 +03:00 committed by GitHub
parent c7c84ca16c
commit a7b2106edf
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 7 deletions
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18
eth/downloader/skeleton.go
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@ -367,6 +367,13 @@ func (s *skeleton) sync(head *types.Header) (*types.Header, error) {
s.filler.resume()
}
defer func() {
// The filler needs to be suspended, but since it can block for a while
// when there are many blocks queued up for full-sync importing, run it
// on a separate goroutine and consume head messages that need instant
// replies.
done := make(chan struct{})
go func() {
defer close(done)
if filled := s.filler.suspend(); filled != nil {
// If something was filled, try to delete stale sync helpers. If
// unsuccessful, warn the user, but not much else we can do (it's
@ -377,6 +384,17 @@ func (s *skeleton) sync(head *types.Header) (*types.Header, error) {
}
}
}()
// Wait for the suspend to finish, consuming head events in the meantime
// and dropping them on the floor.
for {
select {
case <-done:
return
case event := <-s.headEvents:
event.errc <- errors.New("beacon syncer reorging")
}
}
}()
// Create a set of unique channels for this sync cycle. We need these to be
// ephemeral so a data race doesn't accidentally deliver something stale on
// a persistent channel across syncs (yup, this happened)