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tangled.org/core
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jetstream: selectively update subscribers
No need to restart all subscribers when we get a new wantedDid.
+99
-21
+99
-21
jetstream/jetstream.go
+99
-21
jetstream/jetstream.go
···
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return
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}
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// stop all subscribers first
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for _, sub := range j.subscribers {
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if sub.running && sub.cancel != nil {
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sub.cancel()
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sub.running = false
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}
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}
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// calculate how many subscribers we need
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totalDids := len(j.cfg.WantedDids)
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subscribersNeeded := (totalDids + j.maxDidsPerSubscriber - 1) / j.maxDidsPerSubscriber // ceiling division
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// create or reuse subscribers as needed
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j.subscribers = j.subscribers[:0]
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// first case: no subscribers yet; create all needed subscribers
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if len(j.subscribers) == 0 {
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for i := range subscribersNeeded {
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startIdx := i * j.maxDidsPerSubscriber
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endIdx := min((i+1)*j.maxDidsPerSubscriber, totalDids)
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for i := range subscribersNeeded {
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subscriberDids := j.cfg.WantedDids[startIdx:endIdx]
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subCfg := *j.cfg
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subCfg.WantedDids = subscriberDids
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+
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ident := fmt.Sprintf("%s-%d", j.baseIdent, i)
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subscriber := &JetstreamSubscriber{
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dids: subscriberDids,
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ident: ident,
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}
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j.subscribers = append(j.subscribers, subscriber)
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+
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j.subscriberWg.Add(1)
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go j.startSubscriber(subscriber, &subCfg)
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}
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return
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}
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+
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// second case: we have more subscribers than needed, stop extra subscribers
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if len(j.subscribers) > subscribersNeeded {
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for i := subscribersNeeded; i < len(j.subscribers); i++ {
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sub := j.subscribers[i]
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if sub.running && sub.cancel != nil {
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sub.cancel()
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sub.running = false
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}
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}
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j.subscribers = j.subscribers[:subscribersNeeded]
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}
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+
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// third case: we need more subscribers
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if len(j.subscribers) < subscribersNeeded {
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existingCount := len(j.subscribers)
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// Create additional subscribers
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for i := existingCount; i < subscribersNeeded; i++ {
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startIdx := i * j.maxDidsPerSubscriber
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endIdx := min((i+1)*j.maxDidsPerSubscriber, totalDids)
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+
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subscriberDids := j.cfg.WantedDids[startIdx:endIdx]
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subCfg := *j.cfg
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subCfg.WantedDids = subscriberDids
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+
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ident := fmt.Sprintf("%s-%d", j.baseIdent, i)
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subscriber := &JetstreamSubscriber{
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dids: subscriberDids,
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ident: ident,
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}
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j.subscribers = append(j.subscribers, subscriber)
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j.subscriberWg.Add(1)
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go j.startSubscriber(subscriber, &subCfg)
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}
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}
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+
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// fourth case: update existing subscribers with new wantedDids
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for i := 0; i < subscribersNeeded && i < len(j.subscribers); i++ {
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startIdx := i * j.maxDidsPerSubscriber
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endIdx := min((i+1)*j.maxDidsPerSubscriber, totalDids)
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newDids := j.cfg.WantedDids[startIdx:endIdx]
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subscriberDids := j.cfg.WantedDids[startIdx:endIdx]
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// if the dids for this subscriber have changed, restart it
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sub := j.subscribers[i]
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if !didSlicesEqual(sub.dids, newDids) {
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j.l.Info("subscriber DIDs changed, updating",
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"subscriber", sub.ident,
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"old_count", len(sub.dids),
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"new_count", len(newDids))
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subCfg := *j.cfg
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subCfg.WantedDids = subscriberDids
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if sub.running && sub.cancel != nil {
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sub.cancel()
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sub.running = false
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}
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ident := fmt.Sprintf("%s-%d", j.baseIdent, i)
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subscriber := &JetstreamSubscriber{
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dids: subscriberDids,
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ident: ident,
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subCfg := *j.cfg
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subCfg.WantedDids = newDids
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sub.dids = newDids
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j.subscriberWg.Add(1)
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go j.startSubscriber(sub, &subCfg)
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}
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j.subscribers = append(j.subscribers, subscriber)
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}
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}
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j.subscriberWg.Add(1)
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go j.startSubscriber(subscriber, &subCfg)
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func didSlicesEqual(a, b []string) bool {
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if len(a) != len(b) {
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return false
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}
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+
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aMap := make(map[string]struct{}, len(a))
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for _, did := range a {
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aMap[did] = struct{}{}
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}
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+
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for _, did := range b {
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if _, exists := aMap[did]; !exists {
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return false
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}
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}
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return true
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}
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// startSubscriber initializes and starts a single subscriber