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Revert "QSP-42 Remove Double Unsubscribe in Initial Sync" (#6376)

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* Revert "QSP-42 Remove Double Unsubscribe in Initial Sync (#6368)"

This reverts commit 637354f037.

* comment

* add go fmt
This commit is contained in:
Nishant Das 2020-06-24 17:01:48 +08:00 committed by GitHub
parent e9a597b43c
commit e45a06cbf1
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 3 deletions
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16
beacon-chain/sync/initial-sync/service.go
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@ -80,7 +80,17 @@ func (s *Service) Start() {
// Wait for state to be initialized.
stateChannel := make(chan *feed.Event, 1)
stateSub := s.stateNotifier.StateFeed().Subscribe(stateChannel)
for genesisSet := false; !genesisSet; {
// We have two instances in which we call unsubscribe. The first
// instance below is to account for the fact that we exit
// the for-select loop through a return when we receive a closed
// context or error from our subscription. The only way to correctly
// close the subscription would be through a defer. The second instance we
// call unsubscribe when we have already received the state
// initialized event and are proceeding with the main synchronization
// routine.
defer stateSub.Unsubscribe()
genesisSet := false
for !genesisSet {
select {
case event := <-stateChannel:
if event.Type == statefeed.Initialized {
@ -95,10 +105,10 @@ func (s *Service) Start() {
}
case <-s.ctx.Done():
log.Debug("Context closed, exiting goroutine")
break
return
case err := <-stateSub.Err():
log.WithError(err).Error("Subscription to state notifier failed")
break
return
}
}
stateSub.Unsubscribe()