🎉 Initial Commit

pkg/shared/registrar/retirever.go

@@ -0,0 +1,21 @@
+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
+}