[#2] Rename internals

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

resolver/frostfs.go

@@ -0,0 +1,35 @@
+package resolver
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/TrueCloudLab/frostfs-sdk-go/pool"
+)
+
+// FrostFSResolver represents virtual connection to the FrostFS network.
+// It implements resolver.FrostFS.
+type FrostFSResolver struct {
+	pool *pool.Pool
+}
+
+// NewFrostFSResolver creates new FrostFSResolver using provided pool.Pool.
+func NewFrostFSResolver(p *pool.Pool) *FrostFSResolver {
+	return &FrostFSResolver{pool: p}
+}
+
+// SystemDNS implements resolver.FrostFS interface method.
+func (x *FrostFSResolver) SystemDNS(ctx context.Context) (string, error) {
+	networkInfo, err := x.pool.NetworkInfo(ctx)
+	if err != nil {
+		return "", fmt.Errorf("read network info via client: %w", err)
+	}
+
+	domain := networkInfo.RawNetworkParameter("SystemDNS")
+	if domain == nil {
+		return "", errors.New("system DNS parameter not found or empty")
+	}
+
+	return string(domain), nil
+}