package registrar

import (
	"context"
	"fmt"

	clientv3 "go.etcd.io/etcd/client/v3"
)

func (r *ServiceRegistrar) ListInstance(serviceName string, servicePart string) ([]string, error) {
	keyPrefix := fmt.Sprintf("/services/%s/%s", serviceName, servicePart)
	resp, err := r.client.Get(context.Background(), keyPrefix, clientv3.WithPrefix())
	if err != nil {
		return nil, err
	}
	var result []string
	for _, kv := range resp.Kvs {
		result = append(result, string(kv.Value))
	}
	return result, nil
}