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Merge pull request #741 from nspcc-dev/fix/network

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network: fix possible deadlock in DefaultDiscovery
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Roman Khimov 2020-03-10 17:29:45 +03:00 committed by GitHub
commit b7fa8dd40f
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1 changed files with 5 additions and 4 deletions
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9
pkg/network/discovery.go
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@ -30,6 +30,7 @@ type Discoverer interface {
type DefaultDiscovery struct {
transport Transporter
lock sync.RWMutex
closeMtx sync.RWMutex
dialTimeout time.Duration
badAddrs map[string]bool
connectedAddrs map[string]bool
@ -90,11 +91,11 @@ func (d *DefaultDiscovery) pushToPoolOrDrop(addr string) {
// RequestRemote tries to establish a connection with n nodes.
func (d *DefaultDiscovery) RequestRemote(n int) {
d.lock.RLock()
d.closeMtx.RLock()
if !d.isDead {
d.requestCh <- n
}
d.lock.RUnlock()
d.closeMtx.RUnlock()
}
// RegisterBadAddr registers the given address as a bad address.
@ -179,9 +180,9 @@ func (d *DefaultDiscovery) tryAddress(addr string) {
// Close stops discoverer pool processing making discoverer almost useless.
func (d *DefaultDiscovery) Close() {
d.lock.Lock()
d.closeMtx.Lock()
d.isDead = true
d.lock.Unlock()
d.closeMtx.Unlock()
select {
case <-d.requestCh: // Drain the channel if there is anything there.
default: