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Merge pull request #92 from getAlby/fix/ldk-remove-mutex
Fix: LDK remove mutex
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "slices" | ||
| "time" | ||
|
|
||
| "github.com/getAlby/ldk-node-go/ldk_node" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // based on https://betterprogramming.pub/how-to-broadcast-messages-in-go-using-channels-b68f42bdf32e | ||
| type ldkEventBroadcastServer struct { | ||
| logger *logrus.Logger | ||
| source <-chan *ldk_node.Event | ||
| listeners []chan *ldk_node.Event | ||
| addListener chan chan *ldk_node.Event | ||
| removeListener chan (<-chan *ldk_node.Event) | ||
| } | ||
|
|
||
| type LDKEventBroadcaster interface { | ||
| Subscribe() chan *ldk_node.Event | ||
| CancelSubscription(chan *ldk_node.Event) | ||
| } | ||
|
|
||
| func NewLDKEventBroadcaster(logger *logrus.Logger, ctx context.Context, source <-chan *ldk_node.Event) LDKEventBroadcaster { | ||
| service := &ldkEventBroadcastServer{ | ||
| logger: logger, | ||
| source: source, | ||
| listeners: make([]chan *ldk_node.Event, 0), | ||
| addListener: make(chan chan *ldk_node.Event), | ||
| removeListener: make(chan (<-chan *ldk_node.Event)), | ||
| } | ||
| go service.serve(ctx) | ||
| return service | ||
| } | ||
|
|
||
| func (s *ldkEventBroadcastServer) Subscribe() chan *ldk_node.Event { | ||
| newListener := make(chan *ldk_node.Event) | ||
| s.addListener <- newListener | ||
| return newListener | ||
| } | ||
|
|
||
| func (s *ldkEventBroadcastServer) CancelSubscription(channel chan *ldk_node.Event) { | ||
| close(channel) | ||
| s.removeListener <- channel | ||
| } | ||
|
|
||
| func (s *ldkEventBroadcastServer) serve(ctx context.Context) { | ||
| defer func() { | ||
| for _, listener := range s.listeners { | ||
| func() { | ||
| defer func() { | ||
| if r := recover(); r != nil { | ||
| s.logger.Errorf("Failed to close channel: %v", r) | ||
| } | ||
| }() | ||
| close(listener) | ||
| }() | ||
| } | ||
| }() | ||
|
|
||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case newListener := <-s.addListener: | ||
| s.listeners = append(s.listeners, newListener) | ||
| case listenerToRemove := <-s.removeListener: | ||
| for i, listener := range s.listeners { | ||
| if listener == listenerToRemove { | ||
| s.listeners[i] = s.listeners[len(s.listeners)-1] | ||
| s.listeners = slices.Delete(s.listeners, len(s.listeners)-1, len(s.listeners)) | ||
| break | ||
| } | ||
| } | ||
| case event := <-s.source: | ||
| s.logger.Debugf("Sending LDK event %+v to %d listeners", *event, len(s.listeners)) | ||
| for _, listener := range s.listeners { | ||
| func() { | ||
| // if we fail to send the event to the listener it was probably closed | ||
| defer func() { | ||
| if r := recover(); r != nil { | ||
| s.logger.Errorf("Failed to send event to listener: %v", r) | ||
| } | ||
| }() | ||
|
|
||
| select { | ||
| case listener <- event: | ||
| s.logger.Debugln("sent event to listener") | ||
| case <-time.After(5 * time.Second): | ||
| s.logger.Errorf("Timeout sending %+v to listener", *event) | ||
| } | ||
| }() | ||
| } | ||
| } | ||
| } | ||
| } |