Example for my iDDD with Go blog article series at https://medium.com/@TonyBologni

EventMeta.go

package es

import (
    "reflect"
    "strings"
    "time"
)

const (
    metaTimestampFormat = time.RFC3339Nano
)

type EventMeta struct {
    eventName     string
    occurredAt    string
    streamVersion uint
}

func BuildEventMeta(
    event DomainEvent,
    streamVersion uint,
) EventMeta {

    eventType := reflect.TypeOf(event).String()
    eventTypeParts := strings.Split(eventType, ".")
    eventName := eventTypeParts[len(eventTypeParts)-1]

    meta := EventMeta{
        eventName:     eventName,
        occurredAt:    time.Now().Format(metaTimestampFormat),
        streamVersion: streamVersion,
    }

    return meta
}

func RebuildEventMeta(
    eventName string,
    occurredAt string,
    streamVersion uint,
) EventMeta {

    return EventMeta{
        eventName:     eventName,
        occurredAt:    occurredAt,
        streamVersion: streamVersion,
    }
}

func (eventMeta EventMeta) EventName() string {
    return eventMeta.eventName
}

func (eventMeta EventMeta) OccurredAt() string {
    return eventMeta.occurredAt
}

func (eventMeta EventMeta) StreamVersion() uint {
    return eventMeta.streamVersion
}