[#88] nns: temporarily remove nns resolver

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

resolver/nns.go

@@ -1,130 +0,0 @@
-package resolver
-
-import (
-	"context"
-	"fmt"
-
-	nns "github.com/nspcc-dev/neo-go/examples/nft-nd-nns"
-	"github.com/nspcc-dev/neo-go/pkg/rpc/client"
-	"github.com/nspcc-dev/neo-go/pkg/rpc/response/result"
-	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
-	"github.com/nspcc-dev/neo-go/pkg/util"
-	"github.com/nspcc-dev/neo-go/pkg/vm"
-	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
-	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
-)
-
-type NNSResolver interface {
-	// ResolveContainerName get record for domain name+'.container' from NNS contract.
-	ResolveContainerName(name string) (*cid.ID, error)
-}
-
-type nnsResolver struct {
-	rpc     *client.Client
-	nnsHash util.Uint160
-}
-
-const (
-	resolve         = "resolve"
-	containerDomain = ".container"
-)
-
-// NewNNSResolver creates resolver that can get records from NNS contract.
-func NewNNSResolver(ctx context.Context, address string) (NNSResolver, error) {
-	rpc, err := client.New(ctx, address, client.Options{})
-	if err != nil {
-		return nil, err
-	}
-	if err = rpc.Init(); err != nil {
-		return nil, err
-	}
-
-	nnsContract, err := rpc.GetContractStateByID(1)
-	if err != nil {
-		return nil, err
-	}
-
-	return &nnsResolver{
-		rpc:     rpc,
-		nnsHash: nnsContract.Hash,
-	}, nil
-}
-
-func (n *nnsResolver) ResolveContainerName(name string) (*cid.ID, error) {
-	res, err := n.rpc.InvokeFunction(n.nnsHash, resolve, []smartcontract.Parameter{
-		{
-			Type:  smartcontract.StringType,
-			Value: name + containerDomain,
-		},
-		{
-			Type:  smartcontract.IntegerType,
-			Value: int64(nns.TXT),
-		},
-	}, nil)
-	if err != nil {
-		return nil, err
-	}
-	if err = getInvocationError(res); err != nil {
-		return nil, err
-	}
-
-	arr, err := getArrString(res.Stack)
-	if err != nil {
-		return nil, err
-	}
-
-	cnrID := cid.New()
-	for _, rec := range arr {
-		if err = cnrID.Parse(rec); err != nil {
-			continue
-		}
-		return cnrID, nil
-	}
-
-	return nil, fmt.Errorf("not found")
-}
-
-func getArrString(st []stackitem.Item) ([]string, error) {
-	array, err := getArray(st)
-	if err != nil {
-		return nil, err
-	}
-
-	res := make([]string, len(array))
-	for i, item := range array {
-		bs, err := item.TryBytes()
-		if err != nil {
-			return nil, err
-		}
-		res[i] = string(bs)
-	}
-
-	return res, nil
-}
-
-func getArray(st []stackitem.Item) ([]stackitem.Item, error) {
-	index := len(st) - 1 // top stack element is last in the array
-	arr, err := st[index].Convert(stackitem.ArrayT)
-	if err != nil {
-		return nil, err
-	}
-	if _, ok := arr.(stackitem.Null); ok {
-		return nil, nil
-	}
-
-	iterator, ok := arr.Value().([]stackitem.Item)
-	if !ok {
-		return nil, fmt.Errorf("bad conversion")
-	}
-	return iterator, nil
-}
-
-func getInvocationError(result *result.Invoke) error {
-	if result.State != vm.HaltState.String() {
-		return fmt.Errorf("invocation failed: %s", result.FaultException)
-	}
-	if len(result.Stack) == 0 {
-		return fmt.Errorf("result stack is empty")
-	}
-	return nil
-}