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Clean up resources related to the topic if there are no subscribers … #396

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9 changes: 8 additions & 1 deletion pubsub/gochannel/pubsub.go
Original file line number Diff line number Diff line change
Expand Up @@ -205,7 +205,14 @@ func (g *GoChannel) Subscribe(ctx context.Context, topic string) (<-chan *messag
s.Close()

g.subscribersLock.Lock()
defer g.subscribersLock.Unlock()
defer func() {
// if there are no subscribers, clean up any resources related to the topic
if len(g.subscribers[topic]) == 0 {
delete(g.subscribers, topic)
g.subscribersByTopicLock.Delete(topic)
}
g.subscribersLock.Unlock()
}()

subLock, _ := g.subscribersByTopicLock.Load(topic)
subLock.(*sync.Mutex).Lock()
Expand Down