[#1466] adm: Do not use morph client in adm

Using morph client leads to requiring WebSocket endpoints.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

cmd/neofs-adm/internal/modules/morph/local_client.go

@@ -19,7 +19,9 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/core/storage"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
 	"github.com/nspcc-dev/neo-go/pkg/io"
+	"github.com/nspcc-dev/neo-go/pkg/network/payload"
 	"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"
@@ -143,7 +145,7 @@ func (l *localClient) CreateTxFromScript(script []byte, acc *wallet.Account, sys
 	tx.Signers = signers
 	tx.ValidUntilBlock = l.bc.BlockHeight() + 2
 
-	err = l.addNetworkFee(tx, netFee, accounts...)
+	err = l.AddNetworkFee(tx, netFee, accounts...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to add network fee: %w", err)
 	}
@@ -151,11 +153,36 @@ func (l *localClient) CreateTxFromScript(script []byte, acc *wallet.Account, sys
 	return tx, nil
 }
 
-// addNetworkFee adds network fee for each witness script and optional extra
+func (l *localClient) GetCommittee() (keys.PublicKeys, error) {
+	// not used by `morph init` command
+	panic("unexpected call")
+}
+
+func (l *localClient) InvokeFunction(_ util.Uint160, _ string, _ []smartcontract.Parameter, _ []transaction.Signer) (*result.Invoke, error) {
+	// not used by `morph init` command
+	panic("unexpected call")
+}
+
+func (l *localClient) CalculateNotaryFee(_ uint8) (int64, error) {
+	// not used by `morph init` command
+	panic("unexpected call")
+}
+
+func (l *localClient) SignAndPushP2PNotaryRequest(_ *transaction.Transaction, _ []byte, _ int64, _ int64, _ uint32, _ *wallet.Account) (*payload.P2PNotaryRequest, error) {
+	// not used by `morph init` command
+	panic("unexpected call")
+}
+
+func (l *localClient) SignAndPushInvocationTx(_ []byte, _ *wallet.Account, _ int64, _ fixedn.Fixed8, _ []client.SignerAccount) (util.Uint256, error) {
+	// not used by `morph init` command
+	panic("unexpected call")
+}
+
+// AddNetworkFee adds network fee for each witness script and optional extra
 // network fee to transaction. `accs` is an array signer's accounts.
 // Copied from neo-go with minor corrections (no need to support contract signers):
 // https://github.com/nspcc-dev/neo-go/blob/6ff11baa1b9e4c71ef0d1de43b92a8c541ca732c/pkg/rpc/client/rpc.go#L960
-func (l *localClient) addNetworkFee(tx *transaction.Transaction, extraFee int64, accs ...*wallet.Account) error {
+func (l *localClient) AddNetworkFee(tx *transaction.Transaction, extraFee int64, accs ...*wallet.Account) error {
 	if len(tx.Signers) != len(accs) {
 		return errors.New("number of signers must match number of scripts")
 	}

cmd/neofs-adm/internal/modules/morph/n3client.go

@@ -9,6 +9,9 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
+	"github.com/nspcc-dev/neo-go/pkg/network/payload"
 	"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/trigger"
@@ -31,6 +34,11 @@ type Client interface {
 	NEP17BalanceOf(util.Uint160, util.Uint160) (int64, error)
 	InvokeScript([]byte, []transaction.Signer) (*result.Invoke, error)
 	SendRawTransaction(*transaction.Transaction) (util.Uint256, error)
+	GetCommittee() (keys.PublicKeys, error)
+	CalculateNotaryFee(uint8) (int64, error)
+	AddNetworkFee(*transaction.Transaction, int64, ...*wallet.Account) error
+	SignAndPushInvocationTx([]byte, *wallet.Account, int64, fixedn.Fixed8, []client.SignerAccount) (util.Uint256, error)
+	SignAndPushP2PNotaryRequest(*transaction.Transaction, []byte, int64, int64, uint32, *wallet.Account) (*payload.P2PNotaryRequest, error)
 }
 
 type clientContext struct {

cmd/neofs-adm/internal/modules/morph/subnet.go

@@ -7,12 +7,20 @@ import (
 
 	"github.com/nspcc-dev/neo-go/cli/flags"
 	"github.com/nspcc-dev/neo-go/cli/input"
+	"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
+	"github.com/nspcc-dev/neo-go/pkg/core/state"
+	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	neogocli "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/opcode"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/nspcc-dev/neo-go/pkg/wallet"
 	"github.com/nspcc-dev/neofs-node/cmd/neofs-adm/internal/modules/morph/internal"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
-	morphsubnet "github.com/nspcc-dev/neofs-node/pkg/morph/client/subnet"
 	"github.com/nspcc-dev/neofs-node/pkg/util/rand"
 	"github.com/nspcc-dev/neofs-sdk-go/subnet"
 	subnetid "github.com/nspcc-dev/neofs-sdk-go/subnet/id"
@@ -21,12 +29,6 @@ import (
 	"github.com/spf13/viper"
 )
 
-// cmdSubnet flags.
-const (
-	// Neo RPC endpoint
-	flagSubnetEndpoint = endpointFlag
-)
-
 func viperBindFlags(cmd *cobra.Command, flags ...string) {
 	for i := range flags {
 		_ = viper.BindPFlag(flags[i], cmd.Flags().Lookup(flags[i]))
@@ -39,7 +41,7 @@ var cmdSubnet = &cobra.Command{
 	Short: "NeoFS subnet management.",
 	PreRun: func(cmd *cobra.Command, _ []string) {
 		viperBindFlags(cmd,
-			flagSubnetEndpoint,
+			endpointFlag,
 		)
 	},
 }
@@ -110,71 +112,11 @@ func readSubnetKey(key *keys.PrivateKey) error {
 	return nil
 }
 
-// calls initSubnetClientCheckNotary with unset checkNotary.
-func initSubnetClient(c *morphsubnet.Client, key *keys.PrivateKey) error {
-	return initSubnetClientCheckNotary(c, key, false)
-}
-
 const (
 	// enable notary
 	flagSubnetNotary = "notary"
 )
 
-// initializes morph subnet client with the specified private key.
-//
-// Parameters are read from:
-//  * contract address: flagSubnetContract;
-//  * endpoint: flagSubnetEndpoint.
-//
-// If checkNotary is set, notary mode is read from flagSubnetNotary.
-func initSubnetClientCheckNotary(c *morphsubnet.Client, key *keys.PrivateKey, checkNotary bool) error {
-	// read endpoint
-	endpoint := viper.GetString(flagSubnetEndpoint)
-	if endpoint == "" {
-		return errors.New("missing endpoint")
-	}
-
-	// create base morph client
-	cMorph, err := client.New(key, endpoint)
-	if err != nil {
-		return err
-	}
-
-	// Error means group was not set in NNS, continue with Global scope in this case.
-	_ = cMorph.SetGroupSignerScope()
-
-	// read contract address
-	contractAddr, err := cMorph.NNSContractAddress(client.NNSSubnetworkContractName)
-	if err != nil {
-		return fmt.Errorf("read subnet contract address in NNS: %w", err)
-	}
-
-	// calc client mode
-	cMode := morphsubnet.NonNotary
-
-	if checkNotary && viper.GetBool(flagSubnetNotary) {
-		err = cMorph.EnableNotarySupport()
-		if err != nil {
-			return fmt.Errorf("enable notary support: %w", err)
-		}
-
-		cMode = morphsubnet.NotaryNonAlphabet
-	}
-
-	// init subnet morph client
-	var prmInit morphsubnet.InitPrm
-
-	prmInit.SetBaseClient(cMorph)
-	prmInit.SetContractAddress(contractAddr)
-	prmInit.SetMode(cMode)
-
-	if err := c.Init(prmInit); err != nil {
-		return fmt.Errorf("init call: %w", err)
-	}
-
-	return nil
-}
-
 // create subnet command.
 var cmdSubnetCreate = &cobra.Command{
 	Use:   "create",
@@ -231,24 +173,9 @@ var cmdSubnetCreate = &cobra.Command{
 			return fmt.Errorf("marshal subnet info: %w", err)
 		}
 
-		// initialize morph subnet client
-		var cSubnet morphsubnet.Client
-
-		err = initSubnetClientCheckNotary(&cSubnet, &key, true)
+		err = invokeMethod(key, true, "put", binID, key.PublicKey().Bytes(), binInfo)
 		if err != nil {
-			return fmt.Errorf("init subnet client: %w", err)
-		}
-
-		// prepare call parameters and create subnet
-		var prm morphsubnet.PutPrm
-
-		prm.SetID(binID)
-		prm.SetOwner(key.PublicKey().Bytes())
-		prm.SetInfo(binInfo)
-
-		_, err = cSubnet.Put(prm)
-		if err != nil {
-			return fmt.Errorf("morph call: %w", err)
+			return fmt.Errorf("morph invocation: %w", err)
 		}
 
 		cmd.Printf("Create subnet request sent successfully. ID: %s.\n", &id)
@@ -303,22 +230,9 @@ var cmdSubnetRemove = &cobra.Command{
 			return fmt.Errorf("marshal subnet ID: %w", err)
 		}
 
-		// initialize morph subnet client
-		var cSubnet morphsubnet.Client
-
-		err = initSubnetClient(&cSubnet, &key)
+		err = invokeMethod(key, false, "delete", binID)
 		if err != nil {
-			return fmt.Errorf("init subnet client: %w", err)
-		}
-
-		// prepare call parameters and remove subnet
-		var prm morphsubnet.DeletePrm
-
-		prm.SetID(binID)
-
-		_, err = cSubnet.Delete(prm)
-		if err != nil {
-			return fmt.Errorf("morph call: %w", err)
+			return fmt.Errorf("morph invocation: %w", err)
 		}
 
 		cmd.Println("Remove subnet request sent successfully.")
@@ -360,9 +274,6 @@ var cmdSubnetGet = &cobra.Command{
 			return fmt.Errorf("marshal subnet ID: %w", err)
 		}
 
-		// initialize morph subnet client
-		var cSubnet morphsubnet.Client
-
 		// use random key to fetch the data
 		// we could use raw neo-go client to perform testInvoke
 		// without keys, as it is done in other commands
@@ -371,25 +282,23 @@ var cmdSubnetGet = &cobra.Command{
 			return fmt.Errorf("init subnet client: %w", err)
 		}
 
-		err = initSubnetClient(&cSubnet, key)
+		res, err := testInvokeMethod(*key, "get", binID)
 		if err != nil {
-			return fmt.Errorf("init subnet client: %w", err)
+			return fmt.Errorf("morph invocation: %w", err)
 		}
 
-		// prepare call parameters and read subnet
-		var prm morphsubnet.GetPrm
+		if len(res) == 0 {
+			return errors.New("subnet does not exist")
+		}
 
-		prm.SetID(binID)
-
-		res, err := cSubnet.Get(prm)
+		data, err := client.BytesFromStackItem(res[0])
 		if err != nil {
-			return fmt.Errorf("morph call: %w", err)
+			return fmt.Errorf("decoding contract response: %w", err)
 		}
 
 		// decode info
 		var info subnet.Info
-
-		if err = info.Unmarshal(res.Info()); err != nil {
+		if err = info.Unmarshal(data); err != nil {
 			return fmt.Errorf("decode subnet info: %w", err)
 		}
 
@@ -473,7 +382,10 @@ func manageSubnetAdmins(cmd *cobra.Command, rm bool) error {
 	}
 
 	// prepare call parameters
-	var prm morphsubnet.ManageAdminsPrm
+	prm := make([]interface{}, 0, 3)
+	prm = append(prm, binID)
+
+	var method string
 
 	if viper.GetBool(flagSubnetAdminClient) {
 		// read group ID and encode it
@@ -489,28 +401,26 @@ func manageSubnetAdmins(cmd *cobra.Command, rm bool) error {
 			return fmt.Errorf("marshal group ID: %w", err)
 		}
 
-		prm.SetClient()
-		prm.SetGroup(binGroupID)
-	}
-
-	prm.SetSubnet(binID)
-	prm.SetAdmin(binAdminKey)
-
 		if rm {
-		prm.SetRemove()
+			method = "removeClientAdmin"
+		} else {
+			method = "addClientAdmin"
 		}
 
-	// initialize morph subnet client
-	var cSubnet morphsubnet.Client
-
-	err = initSubnetClient(&cSubnet, &key)
-	if err != nil {
-		return fmt.Errorf("init subnet client: %w", err)
+		prm = append(prm, binGroupID)
+	} else {
+		if rm {
+			method = "removeNodeAdmin"
+		} else {
+			method = "addNodeAdmin"
+		}
 	}
 
-	_, err = cSubnet.ManageAdmins(prm)
+	prm = append(prm, binAdminKey)
+
+	err = invokeMethod(key, false, method, prm...)
 	if err != nil {
-		return fmt.Errorf("morph call: %w", err)
+		return fmt.Errorf("morph invocation: %w", err)
 	}
 
 	var op string
@@ -628,27 +538,16 @@ func manageSubnetClients(cmd *cobra.Command, rm bool) error {
 		return fmt.Errorf("marshal group ID: %w", err)
 	}
 
-	var prm morphsubnet.ManageClientsPrm
-
-	prm.SetGroup(binGroupID)
-	prm.SetSubnet(binID)
-	prm.SetClient(clientID.WalletBytes())
-
+	var method string
 	if rm {
-		prm.SetRemove()
+		method = "removeUser"
+	} else {
+		method = "addUser"
 	}
 
-	// initialize morph subnet client
-	var cSubnet morphsubnet.Client
-
-	err = initSubnetClient(&cSubnet, &key)
+	err = invokeMethod(key, false, method, binID, binGroupID, clientID.WalletBytes())
 	if err != nil {
-		return fmt.Errorf("init subnet client: %w", err)
-	}
-
-	_, err = cSubnet.ManageClients(prm)
-	if err != nil {
-		return fmt.Errorf("morph call: %w", err)
+		return fmt.Errorf("morph invocation: %w", err)
 	}
 
 	var op string
@@ -728,26 +627,16 @@ func manageSubnetNodes(cmd *cobra.Command, rm bool) error {
 		return fmt.Errorf("node ID format: %w", err)
 	}
 
-	var prm morphsubnet.ManageNodesPrm
-
-	prm.SetSubnet(binID)
-	prm.SetNode(binNodeID)
-
+	var method string
 	if rm {
-		prm.SetRemove()
+		method = "removeNode"
+	} else {
+		method = "addNode"
 	}
 
-	// initialize morph subnet client
-	var cSubnet morphsubnet.Client
-
-	err = initSubnetClient(&cSubnet, &key)
+	err = invokeMethod(key, false, method, binID, binNodeID)
 	if err != nil {
-		return fmt.Errorf("init subnet client: %w", err)
-	}
-
-	_, err = cSubnet.ManageNodes(prm)
-	if err != nil {
-		return fmt.Errorf("morph call: %w", err)
+		return fmt.Errorf("morph invocation: %w", err)
 	}
 
 	var op string
@@ -897,8 +786,8 @@ func init() {
 
 	// subnet global flags
 	cmdSubnetFlags := cmdSubnet.PersistentFlags()
-	cmdSubnetFlags.StringP(flagSubnetEndpoint, "r", "", "N3 RPC node endpoint")
-	_ = cmdSubnet.MarkFlagRequired(flagSubnetEndpoint)
+	cmdSubnetFlags.StringP(endpointFlag, "r", "", "N3 RPC node endpoint")
+	_ = cmdSubnet.MarkFlagRequired(endpointFlag)
 
 	// add all subnet commands to corresponding command section
 	addCommandInheritPreRun(cmdSubnet,
@@ -910,3 +799,318 @@ func init() {
 		cmdSubnetNode,
 	)
 }
+
+func testInvokeMethod(key keys.PrivateKey, method string, args ...interface{}) ([]stackitem.Item, error) {
+	c, err := getN3Client(viper.GetViper())
+	if err != nil {
+		return nil, fmt.Errorf("morph client creation: %w", err)
+	}
+
+	nnsCs, err := c.GetContractStateByID(1)
+	if err != nil {
+		return nil, fmt.Errorf("NNS contract resolving: %w", err)
+	}
+
+	subnetHash, err := nnsResolveHash(c, nnsCs.Hash, subnetContract+".neofs")
+	if err != nil {
+		return nil, fmt.Errorf("subnet hash resolving: %w", err)
+	}
+
+	cosigner := []transaction.Signer{
+		{
+			Account: key.PublicKey().GetScriptHash(),
+			Scopes:  transaction.Global,
+		},
+	}
+
+	res, err := invokeFunction(c, subnetHash, method, args, cosigner)
+	if err != nil {
+		return nil, fmt.Errorf("invocation parameters prepararion: %w", err)
+	}
+
+	err = checkInvocationResults(res)
+	if err != nil {
+		return nil, err
+	}
+
+	return res.Stack, nil
+}
+
+func invokeMethod(key keys.PrivateKey, tryNotary bool, method string, args ...interface{}) error {
+	c, err := getN3Client(viper.GetViper())
+	if err != nil {
+		return fmt.Errorf("morph client creation: %w", err)
+	}
+
+	if tryNotary {
+		cc, err := c.GetNativeContracts()
+		if err != nil {
+			return fmt.Errorf("native hashes: %w", err)
+		}
+
+		var notary bool
+		var notaryHash util.Uint160
+		for _, c := range cc {
+			if c.Manifest.Name == nativenames.Notary {
+				notary = len(c.UpdateHistory) > 0
+				notaryHash = c.Hash
+
+				break
+			}
+		}
+
+		if notary {
+			err = invokeNotary(c, key, method, notaryHash, args...)
+			if err != nil {
+				return fmt.Errorf("notary invocation: %w", err)
+			}
+
+			return nil
+		}
+	}
+
+	err = invokeNonNotary(c, key, method, args...)
+	if err != nil {
+		return fmt.Errorf("non-notary invocation: %w", err)
+	}
+
+	return nil
+}
+
+func invokeNonNotary(c Client, key keys.PrivateKey, method string, args ...interface{}) error {
+	nnsCs, err := c.GetContractStateByID(1)
+	if err != nil {
+		return fmt.Errorf("NNS contract resolving: %w", err)
+	}
+
+	subnetHash, err := nnsResolveHash(c, nnsCs.Hash, subnetContract+".neofs")
+	if err != nil {
+		return fmt.Errorf("subnet hash resolving: %w", err)
+	}
+
+	acc := wallet.NewAccountFromPrivateKey(&key)
+
+	cosigner := []transaction.Signer{
+		{
+			Account: key.PublicKey().GetScriptHash(),
+			Scopes:  transaction.Global,
+		},
+	}
+
+	cosignerAcc := []neogocli.SignerAccount{
+		{
+			Signer:  cosigner[0],
+			Account: acc,
+		},
+	}
+
+	test, err := invokeFunction(c, subnetHash, method, args, cosigner)
+	if err != nil {
+		return fmt.Errorf("test invocation: %w", err)
+	}
+
+	err = checkInvocationResults(test)
+	if err != nil {
+		return err
+	}
+
+	_, err = c.SignAndPushInvocationTx(test.Script, acc, test.GasConsumed, 0, cosignerAcc)
+	if err != nil {
+		return fmt.Errorf("sending transaction: %w", err)
+	}
+
+	return nil
+}
+
+func invokeNotary(c Client, key keys.PrivateKey, method string, notaryHash util.Uint160, args ...interface{}) error {
+	nnsCs, err := c.GetContractStateByID(1)
+	if err != nil {
+		return fmt.Errorf("NNS contract resolving: %w", err)
+	}
+
+	subnetHash, err := nnsResolveHash(c, nnsCs.Hash, subnetContract+".neofs")
+	if err != nil {
+		return fmt.Errorf("subnet hash resolving: %w", err)
+	}
+
+	alphabet, err := c.GetCommittee()
+	if err != nil {
+		return fmt.Errorf("alphabet list: %w", err)
+	}
+
+	multisigScript, err := smartcontract.CreateDefaultMultiSigRedeemScript(alphabet)
+	if err != nil {
+		return fmt.Errorf("alphabet multi-signature script: %w", err)
+	}
+
+	cosigners, err := notaryCosigners(c, notaryHash, nnsCs, key, hash.Hash160(multisigScript))
+	if err != nil {
+		return fmt.Errorf("cosigners collecting: %w", err)
+	}
+
+	// make test invocation of the method
+	test, err := invokeFunction(c, subnetHash, method, args, cosigners)
+	if err != nil {
+		return fmt.Errorf("test invocation: %w", err)
+	}
+
+	err = checkInvocationResults(test)
+	if err != nil {
+		return err
+	}
+
+	multisigAccount := &wallet.Account{
+		Contract: &wallet.Contract{
+			Script: multisigScript,
+		},
+	}
+
+	bc, err := c.GetBlockCount()
+	if err != nil {
+		return fmt.Errorf("blockchain height: %w", err)
+	}
+
+	signersNumber := uint8(smartcontract.GetDefaultHonestNodeCount(len(alphabet)) + 1) // alphabet multisig + key signature
+
+	// notaryRequestValidity is number of blocks during
+	// witch notary request is considered valid
+	const notaryRequestValidity = 100
+
+	mainTx := &transaction.Transaction{
+		Nonce:           rand.Uint32(),
+		SystemFee:       test.GasConsumed,
+		ValidUntilBlock: bc + notaryRequestValidity,
+		Script:          test.Script,
+		Attributes: []transaction.Attribute{
+			{
+				Type:  transaction.NotaryAssistedT,
+				Value: &transaction.NotaryAssisted{NKeys: signersNumber},
+			},
+		},
+		Signers: cosigners,
+	}
+
+	notaryFee, err := c.CalculateNotaryFee(signersNumber)
+	if err != nil {
+		return err
+	}
+
+	acc := wallet.NewAccountFromPrivateKey(&key)
+	aa := notaryAccounts(multisigAccount, acc)
+
+	err = c.AddNetworkFee(mainTx, notaryFee, aa...)
+	if err != nil {
+		return fmt.Errorf("notary network fee adding: %w", err)
+	}
+
+	mainTx.Scripts = notaryWitnesses(c, multisigAccount, acc, mainTx)
+
+	_, err = c.SignAndPushP2PNotaryRequest(mainTx,
+		[]byte{byte(opcode.RET)},
+		-1,
+		0,
+		40,
+		acc)
+	if err != nil {
+		return fmt.Errorf("sending notary request: %w", err)
+	}
+
+	return nil
+}
+
+func notaryCosigners(c Client, notaryHash util.Uint160, nnsCs *state.Contract,
+	key keys.PrivateKey, alphabetAccount util.Uint160) ([]transaction.Signer, error) {
+	proxyHash, err := nnsResolveHash(c, nnsCs.Hash, proxyContract+".neofs")
+	if err != nil {
+		return nil, fmt.Errorf("proxy hash resolving: %w", err)
+	}
+
+	return []transaction.Signer{
+		{
+			Account: proxyHash,
+			Scopes:  transaction.None,
+		},
+		{
+			Account: alphabetAccount,
+			Scopes:  transaction.Global,
+		},
+		{
+			Account: hash.Hash160(key.PublicKey().GetVerificationScript()),
+			Scopes:  transaction.Global,
+		},
+		{
+			Account: notaryHash,
+			Scopes:  transaction.None,
+		},
+	}, nil
+}
+
+func notaryAccounts(alphabet, acc *wallet.Account) []*wallet.Account {
+	return []*wallet.Account{
+		// proxy
+		{
+			Contract: &wallet.Contract{
+				Deployed: true,
+			},
+		},
+		alphabet,
+		// caller's account
+		acc,
+		// last one is a placeholder for notary contract account
+		{
+			Contract: &wallet.Contract{},
+		},
+	}
+}
+
+func notaryWitnesses(c Client, alphabet, acc *wallet.Account, tx *transaction.Transaction) []transaction.Witness {
+	ww := make([]transaction.Witness, 0, 4)
+
+	// empty proxy contract witness
+	ww = append(ww, transaction.Witness{
+		InvocationScript:   []byte{},
+		VerificationScript: []byte{},
+	})
+
+	// alphabet multi-address witness
+	ww = append(ww, transaction.Witness{
+		InvocationScript: append(
+			[]byte{byte(opcode.PUSHDATA1), 64},
+			make([]byte, 64)...,
+		),
+		VerificationScript: alphabet.GetVerificationScript(),
+	})
+
+	magicNumber, _ := c.GetNetwork()
+
+	// caller's witness
+	ww = append(ww, transaction.Witness{
+		InvocationScript: append(
+			[]byte{byte(opcode.PUSHDATA1), 64},
+			acc.PrivateKey().SignHashable(uint32(magicNumber), tx)...),
+		VerificationScript: acc.GetVerificationScript(),
+	})
+
+	// notary contract witness
+	ww = append(ww, transaction.Witness{
+		InvocationScript: append(
+			[]byte{byte(opcode.PUSHDATA1), 64},
+			make([]byte, 64)...,
+		),
+		VerificationScript: []byte{},
+	})
+
+	return ww
+}
+
+func checkInvocationResults(res *result.Invoke) error {
+	if res.State != "HALT" {
+		return fmt.Errorf("test invocation state: %s, exception %s: ", res.State, res.FaultException)
+	}
+
+	if len(res.Script) == 0 {
+		return errors.New("empty invocation script")
+	}
+
+	return nil
+}