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Event bus #100
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Event bus #100
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aba60b0
add event bus
lploom 93fe3a7
integrate event bus
lploom d7e7bc4
correct trust base env variable
lploom 7eabde7
update bft core image
lploom 8c9f652
debug log for bft core
lploom 796c5bc
fix possible cache inconsistency
lploom 8fd6757
simplify cached trust base store
lploom bb8a3e8
keep block sync alive in case of any errors
lploom 32a2123
add projection when fetching latest block number
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| package events | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "slices" | ||
| "sync" | ||
|
|
||
| "github.com/unicitynetwork/aggregator-go/internal/logger" | ||
| ) | ||
|
|
||
| type ( | ||
| Event interface{} | ||
|
|
||
| Topic string | ||
|
|
||
| EventBus struct { | ||
| logger *logger.Logger | ||
|
|
||
| mu sync.RWMutex | ||
| subscribers map[Topic][]chan Event | ||
| } | ||
| ) | ||
|
|
||
| func NewEventBus(log *logger.Logger) *EventBus { | ||
| return &EventBus{ | ||
| logger: log, | ||
| subscribers: make(map[Topic][]chan Event), | ||
| } | ||
| } | ||
|
|
||
| // Subscribe creates a channel, adds it to the subscribers list, and returns it to the caller. | ||
| func (bus *EventBus) Subscribe(topic Topic) <-chan Event { | ||
| bus.mu.Lock() | ||
| defer bus.mu.Unlock() | ||
|
|
||
| ch := make(chan Event, 1) | ||
| bus.subscribers[topic] = append(bus.subscribers[topic], ch) | ||
| return ch | ||
| } | ||
|
|
||
| // Publish sends the event to all subscribers. | ||
| // If the subscriber is busy then the event is dropped. | ||
| func (bus *EventBus) Publish(topic Topic, event Event) { | ||
| bus.mu.RLock() | ||
| defer bus.mu.RUnlock() | ||
|
|
||
| subscribers, found := bus.subscribers[topic] | ||
| if !found { | ||
| bus.logger.Warn("Event not published, no subscriber found", "topic", topic) | ||
| return | ||
| } | ||
| for _, sub := range subscribers { | ||
| select { | ||
| case sub <- event: | ||
| default: | ||
| bus.logger.Warn("Dropped event for a slow subscriber", "topic", topic, "event", event) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Unsubscribe removes the subscriber from the subscribers list, | ||
| // returns error if the provided topic does not exist or the subscriber was not found. | ||
| func (bus *EventBus) Unsubscribe(topic Topic, sub <-chan Event) error { | ||
| bus.mu.Lock() | ||
| defer bus.mu.Unlock() | ||
|
|
||
| subs, found := bus.subscribers[topic] | ||
| if !found { | ||
| return fmt.Errorf("topic not found: %s", topic) | ||
| } | ||
| for i, s := range subs { | ||
| if s == sub { | ||
| bus.subscribers[topic] = slices.Delete(subs, i, i+1) | ||
| return nil | ||
| } | ||
| } | ||
| return fmt.Errorf("subscriber not found for topic: %s", topic) | ||
| } | ||
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