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Implement pubsub broker to broadcast lines to all websocket clients
fixes case where new websocket clients consume lines, resulting in incomplete logs in all websocket clients
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| // Sourced from https://github.com/eliben/code-for-blog/blob/master/2020/go-pubsub/pubsub-channel-return.go | ||
| // and https://eli.thegreenplace.net/2020/pubsub-using-channels-in-go/ | ||
| // License; Public Domain | ||
|
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| package internal | ||
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| import ( | ||
| "sync" | ||
| ) | ||
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| type Pubsub struct { | ||
| mu sync.RWMutex | ||
| subs map[string][]chan string | ||
| closed bool | ||
| } | ||
|
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| func NewPubsub() *Pubsub { | ||
| ps := &Pubsub{} | ||
| ps.subs = make(map[string][]chan string) | ||
| ps.closed = false | ||
| return ps | ||
| } | ||
|
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| func (ps *Pubsub) Subscribe(topic string) <-chan string { | ||
| ps.mu.Lock() | ||
| defer ps.mu.Unlock() | ||
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| ch := make(chan string, 1) | ||
| ps.subs[topic] = append(ps.subs[topic], ch) | ||
| return ch | ||
| } | ||
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| func (ps *Pubsub) Publish(topic string, msg string) { | ||
| ps.mu.RLock() | ||
| defer ps.mu.RUnlock() | ||
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| if ps.closed { | ||
| return | ||
| } | ||
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| for _, ch := range ps.subs[topic] { | ||
| ch <- msg | ||
| } | ||
| } | ||
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| func (ps *Pubsub) Close() { | ||
| ps.mu.Lock() | ||
| defer ps.mu.Unlock() | ||
|
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| if !ps.closed { | ||
| ps.closed = true | ||
| for _, subs := range ps.subs { | ||
| for _, ch := range subs { | ||
| close(ch) | ||
| } | ||
| } | ||
| } | ||
| } |
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