dynamoDB stream event trigger handling code

dynamo_stream_event_trigger.go

func handler(ctx context.Context, ev events.S3Event) {

	// need to handle PUT, DELETE, UPDATE, separately
	for _, record := range ev.Records {
		switch record.EventName {
		case "INSERT":
			fmt.Printf("%+v\n", record)
			var rr localTypes.ActivityEventsTable
			UnmarshalStreamImage(record.Change.NewImage, rr)
			fmt.Printf("%+v\n", rr)
		case "MODIFY":

		case "DELETE":

			fmt.Printf("delete event")
		}
	}
}
// UnmarshalStreamImage converts events.DynamoDBAttributeValue to struct
func UnmarshalStreamImage(attribute map[string]events.DynamoDBAttributeValue, out interface{}) error {

	dbAttrMap := make(map[string]types.AttributeValue)

	for k, v := range attribute {

		var dbAttr types.AttributeValue

		bytes, marshalErr := v.MarshalJSON()
		if marshalErr != nil {
			return marshalErr
		}

		json.Unmarshal(bytes, &dbAttr)
		dbAttrMap[k] = dbAttr
	}
	return attributevalue.UnmarshalMap(dbAttrMap, out)

}