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events.go
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events.go
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package eventbus
import (
"encoding/json"
"time"
"github.com/nats-io/nats.go"
)
type EventOption interface {
ConfigureEvent(e *Event)
}
type Event struct {
Name string
Payload any
Metadata map[string]string
CreatedAt time.Time
}
func NewEvent(name string, payload any, opts ...EventOption) Event {
e := Event{
Name: name,
Payload: payload,
Metadata: make(map[string]string),
CreatedAt: time.Now().UTC(),
}
for _, option := range opts {
option.ConfigureEvent(&e)
}
return e
}
type eventInitiator struct {
Initiator string
}
func (o *eventInitiator) ConfigureEvent(e *Event) {
e.Metadata[InitiatorMD] = o.Initiator
}
// WithEventinitiator adds the event initiator the event metadata
func WithEventinitiator(initiator string) eventInitiator {
return eventInitiator{
Initiator: initiator,
}
}
func EventToNatsMsg(e Event) (*nats.Msg, error) {
msg := nats.NewMsg(e.Name)
for k, v := range e.Metadata {
msg.Header.Add(k, v)
}
msg.Header.Add(CreatedAtHeader, e.CreatedAt.Format(time.RFC3339Nano))
data, err := json.Marshal(e.Payload)
if err != nil {
return nil, err
}
msg.Data = data
return msg, nil
}