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event_center_cluster.go
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event_center_cluster.go
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package eventcore
import (
"context"
"sync"
"github.com/ThreeDotsLabs/watermill"
"github.com/ThreeDotsLabs/watermill/message"
log "github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/google/uuid"
)
type Dispatcher interface {
}
type EventCenterCluster struct {
uuid uuid.UUID
EventCenter
Backend
receivers *EventReceivers
}
type Receiver <-chan *message.Message
type EventReceivers struct {
sync.Map
}
func (rs *EventReceivers) Loop(f func(e Event) error) error {
var err error
rs.Range(func(key, value interface{}) bool {
if r, ok := value.(Receiver); ok {
select {
case msg, ok := <-r:
if !ok {
rs.Delete(key)
level.Info(Logger).Log("message", "topic reciever close")
return true
}
level.Debug(Logger).Log("received message", msg.UUID, "payload", msg.Payload)
var e Event = &EventBase{}
e, err = e.Unserialize(msg.Payload)
if err != nil {
level.Error(Logger).Log("error", err)
return true
}
level.Debug(Logger).Log("received message", msg.UUID, "event", e)
if err := f(e); err != nil {
level.Error(Logger).Log("error", err)
return true
}
msg.Ack()
default:
}
}
return true
})
return err
}
func (h *EventCenterCluster) UUID() uuid.UUID {
return h.uuid
}
func NewEventCenterCluster(backend Backend, workers int, uuid uuid.UUID) *EventCenterCluster {
h := &EventCenterCluster{
uuid: uuid,
receivers: &EventReceivers{},
Backend: backend,
}
h.init(backend)
for i := 0; i < workers; i++ {
go h.Run()
}
return h
}
func (h *EventCenterCluster) init(backend Backend) {
h.Backend.SetConsumerGroupName(h.uuid.String())
}
func (h *EventCenterCluster) Run() {
logger := log.With(Logger, "event_center_id", h.uuid)
for {
h.receivers.Loop(func(e Event) error {
h.EventCenter.Emit(e)
logger.Log("event", e)
return nil
})
}
}
func (h *EventCenterCluster) Subscribe(eventType EventType, handler EventHandler, handlerName string) error {
h.EventCenter.Subscribe(eventType, handler, handlerName)
messages, err := h.Backend.Subscriber().Subscribe(context.Background(), string(eventType))
if err != nil {
return err
}
h.receivers.Store(eventType, Receiver(messages))
return nil
}
func (h *EventCenterCluster) Emit(event Event) {
event.BindSelf(event)
payload, err := event.Serialize()
if err != nil {
level.Error(Logger).Log(err)
}
msg := message.NewMessage(watermill.NewUUID(), payload)
h.Publisher().Publish(string(event.GetType()), msg)
}
func (h *EventCenterCluster) Stop() {
err := h.Backend.Close()
if err != nil {
level.Error(Logger).Log(err)
}
}