neotest: add contract testing framework

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

.gitignore

@@ -28,9 +28,8 @@ bin/
 *~
 TAGS
 
-# leveldb 
-chains/
-chain/
+# storage 
+/chains
 
 # patch
 *.orig

pkg/neotest/account.go

@@ -0,0 +1,8 @@
+package neotest
+
+var _nonce uint32
+
+func nonce() uint32 {
+	_nonce++
+	return _nonce
+}

pkg/neotest/basic.go

@@ -0,0 +1,272 @@
+package neotest
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
+	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
+	"github.com/nspcc-dev/neo-go/pkg/core/fee"
+	"github.com/nspcc-dev/neo-go/pkg/core/native"
+	"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/io"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm"
+	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
+	"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/stretchr/testify/require"
+)
+
+// Executor is a wrapper over chain state.
+type Executor struct {
+	Chain         blockchainer.Blockchainer
+	Committee     *wallet.Account
+	CommitteeHash util.Uint160
+	Contracts     map[string]*Contract
+}
+
+// NewExecutor creates new executor instance from provided blockchain and committee.
+func NewExecutor(t *testing.T, bc blockchainer.Blockchainer, committee *wallet.Account) *Executor {
+	require.Equal(t, 1, len(bc.GetConfig().StandbyCommittee))
+
+	return &Executor{
+		Chain:         bc,
+		Committee:     committee,
+		CommitteeHash: committee.Contract.ScriptHash(),
+		Contracts:     make(map[string]*Contract),
+	}
+}
+
+// TopBlock returns block with the highest index.
+func (e *Executor) TopBlock(t *testing.T) *block.Block {
+	b, err := e.Chain.GetBlock(e.Chain.GetHeaderHash(int(e.Chain.BlockHeight())))
+	require.NoError(t, err)
+	return b
+}
+
+// NativeHash returns native contract hash by name.
+func (e *Executor) NativeHash(t *testing.T, name string) util.Uint160 {
+	h, err := e.Chain.GetNativeContractScriptHash(name)
+	require.NoError(t, err)
+	return h
+}
+
+// NewUnsignedTx creates new unsigned transaction which invokes method of contract with hash.
+func (e *Executor) NewUnsignedTx(t *testing.T, hash util.Uint160, method string, args ...interface{}) *transaction.Transaction {
+	w := io.NewBufBinWriter()
+	emit.AppCall(w.BinWriter, hash, method, callflag.All, args...)
+	require.NoError(t, w.Err)
+
+	script := w.Bytes()
+	tx := transaction.New(script, 0)
+	tx.Nonce = nonce()
+	tx.ValidUntilBlock = e.Chain.BlockHeight() + 1
+	return tx
+}
+
+// NewTx creates new transaction which invokes contract method.
+// Transaction is signed with signer.
+func (e *Executor) NewTx(t *testing.T, signer interface{},
+	hash util.Uint160, method string, args ...interface{}) *transaction.Transaction {
+	tx := e.NewUnsignedTx(t, hash, method, args...)
+	return e.SignTx(t, tx, -1, signer)
+}
+
+// SignTx signs a transaction using provided signers.
+// signers can be either *wallet.Account or []*wallet.Account.
+func (e *Executor) SignTx(t *testing.T, tx *transaction.Transaction, sysFee int64, signers interface{}) *transaction.Transaction {
+	switch s := signers.(type) {
+	case *wallet.Account:
+		tx.Signers = append(tx.Signers, transaction.Signer{
+			Account: s.Contract.ScriptHash(),
+			Scopes:  transaction.Global,
+		})
+		addNetworkFee(e.Chain, tx, s)
+		addSystemFee(e.Chain, tx, sysFee)
+		require.NoError(t, s.SignTx(e.Chain.GetConfig().Magic, tx))
+	case []*wallet.Account:
+		for _, acc := range s {
+			tx.Signers = append(tx.Signers, transaction.Signer{
+				Account: acc.Contract.ScriptHash(),
+				Scopes:  transaction.Global,
+			})
+		}
+		for _, acc := range s {
+			addNetworkFee(e.Chain, tx, acc)
+		}
+		addSystemFee(e.Chain, tx, sysFee)
+		for _, acc := range s {
+			require.NoError(t, acc.SignTx(e.Chain.GetConfig().Magic, tx))
+		}
+	default:
+		panic("invalid signer")
+	}
+
+	return tx
+}
+
+// NewAccount returns new account holding 100.0 GAS. This method advances the chain
+// by one block with a transfer transaction.
+func (e *Executor) NewAccount(t *testing.T) *wallet.Account {
+	acc, err := wallet.NewAccount()
+	require.NoError(t, err)
+
+	tx := e.NewTx(t, e.Committee,
+		e.NativeHash(t, nativenames.Gas), "transfer",
+		e.Committee.Contract.ScriptHash(), acc.Contract.ScriptHash(), int64(100_0000_0000), nil)
+	e.AddNewBlock(t, tx)
+	e.CheckHalt(t, tx.Hash())
+	return acc
+}
+
+// DeployContract compiles and deploys contract to bc.
+// data is an optional argument to `_deploy`.
+// Returns hash of the deploy transaction.
+func (e *Executor) DeployContract(t *testing.T, c *Contract, data interface{}) util.Uint256 {
+	tx := e.NewDeployTx(t, e.Chain, c, data)
+	e.AddNewBlock(t, tx)
+	e.CheckHalt(t, tx.Hash())
+	return tx.Hash()
+}
+
+// CheckHalt checks that transaction persisted with HALT state.
+func (e *Executor) CheckHalt(t *testing.T, h util.Uint256, stack ...stackitem.Item) *state.AppExecResult {
+	aer, err := e.Chain.GetAppExecResults(h, trigger.Application)
+	require.NoError(t, err)
+	require.Equal(t, vm.HaltState, aer[0].VMState, aer[0].FaultException)
+	if len(stack) != 0 {
+		require.Equal(t, stack, aer[0].Stack)
+	}
+	return &aer[0]
+}
+
+// CheckFault checks that transaction persisted with FAULT state.
+// Raised exception is also checked to contain s as a substring.
+func (e *Executor) CheckFault(t *testing.T, h util.Uint256, s string) {
+	aer, err := e.Chain.GetAppExecResults(h, trigger.Application)
+	require.NoError(t, err)
+	require.Equal(t, vm.FaultState, aer[0].VMState)
+	require.True(t, strings.Contains(aer[0].FaultException, s),
+		"expected: %s, got: %s", s, aer[0].FaultException)
+}
+
+// NewDeployTx returns new deployment tx for contract signed by committee.
+func (e *Executor) NewDeployTx(t *testing.T, bc blockchainer.Blockchainer, c *Contract, data interface{}) *transaction.Transaction {
+	rawManifest, err := json.Marshal(c.Manifest)
+	require.NoError(t, err)
+
+	neb, err := c.NEF.Bytes()
+	require.NoError(t, err)
+
+	buf := io.NewBufBinWriter()
+	emit.AppCall(buf.BinWriter, bc.ManagementContractHash(), "deploy", callflag.All, neb, rawManifest, data)
+	require.NoError(t, buf.Err)
+
+	tx := transaction.New(buf.Bytes(), 100*native.GASFactor)
+	tx.Nonce = nonce()
+	tx.ValidUntilBlock = bc.BlockHeight() + 1
+	tx.Signers = []transaction.Signer{{
+		Account: e.Committee.Contract.ScriptHash(),
+		Scopes:  transaction.Global,
+	}}
+	addNetworkFee(bc, tx, e.Committee)
+	require.NoError(t, e.Committee.SignTx(netmode.UnitTestNet, tx))
+	return tx
+}
+
+func addSystemFee(bc blockchainer.Blockchainer, tx *transaction.Transaction, sysFee int64) {
+	if sysFee >= 0 {
+		tx.SystemFee = sysFee
+		return
+	}
+	v, _ := TestInvoke(bc, tx) // ignore error to support failing transactions
+	tx.SystemFee = v.GasConsumed()
+}
+
+func addNetworkFee(bc blockchainer.Blockchainer, tx *transaction.Transaction, sender *wallet.Account) {
+	baseFee := bc.GetPolicer().GetBaseExecFee()
+	size := io.GetVarSize(tx)
+	netFee, sizeDelta := fee.Calculate(baseFee, sender.Contract.Script)
+	tx.NetworkFee += netFee
+	size += sizeDelta
+	tx.NetworkFee += int64(size) * bc.FeePerByte()
+}
+
+// NewUnsignedBlock creates new unsigned block from txs.
+func (e *Executor) NewUnsignedBlock(t *testing.T, txs ...*transaction.Transaction) *block.Block {
+	lastBlock := e.TopBlock(t)
+	b := &block.Block{
+		Header: block.Header{
+			NextConsensus: e.Committee.Contract.ScriptHash(),
+			Script: transaction.Witness{
+				VerificationScript: e.Committee.Contract.Script,
+			},
+			Timestamp: lastBlock.Timestamp + 1,
+		},
+		Transactions: txs,
+	}
+	if e.Chain.GetConfig().StateRootInHeader {
+		b.StateRootEnabled = true
+		b.PrevStateRoot = e.Chain.GetStateModule().CurrentLocalStateRoot()
+	}
+	b.PrevHash = lastBlock.Hash()
+	b.Index = e.Chain.BlockHeight() + 1
+	b.RebuildMerkleRoot()
+	return b
+}
+
+// AddNewBlock creates a new block from provided transactions and adds it on bc.
+func (e *Executor) AddNewBlock(t *testing.T, txs ...*transaction.Transaction) *block.Block {
+	b := e.NewUnsignedBlock(t, txs...)
+	e.SignBlock(b)
+	require.NoError(t, e.Chain.AddBlock(b))
+	return b
+}
+
+// SignBlock add validators signature to b.
+func (e *Executor) SignBlock(b *block.Block) *block.Block {
+	sign := e.Committee.PrivateKey().SignHashable(uint32(e.Chain.GetConfig().Magic), b)
+	b.Script.InvocationScript = append([]byte{byte(opcode.PUSHDATA1), 64}, sign...)
+	return b
+}
+
+// AddBlockCheckHalt is a convenient wrapper over AddNewBlock and CheckHalt.
+func (e *Executor) AddBlockCheckHalt(t *testing.T, bc blockchainer.Blockchainer, txs ...*transaction.Transaction) *block.Block {
+	b := e.AddNewBlock(t, txs...)
+	for _, tx := range txs {
+		e.CheckHalt(t, tx.Hash())
+	}
+	return b
+}
+
+// TestInvoke creates a test VM with dummy block and executes transaction in it.
+func TestInvoke(bc blockchainer.Blockchainer, tx *transaction.Transaction) (*vm.VM, error) {
+	lastBlock, err := bc.GetBlock(bc.GetHeaderHash(int(bc.BlockHeight())))
+	if err != nil {
+		return nil, err
+	}
+	b := &block.Block{
+		Header: block.Header{
+			Index:     bc.BlockHeight() + 1,
+			Timestamp: lastBlock.Timestamp + 1,
+		},
+	}
+
+	// `GetTestVM` as well as `Run` can use transaction hash which will set cached value.
+	// This is unwanted behaviour so we explicitly copy transaction to perform execution.
+	ttx := *tx
+	v, f := bc.GetTestVM(trigger.Application, &ttx, b)
+	defer f()
+
+	v.LoadWithFlags(tx.Script, callflag.All)
+	err = v.Run()
+	return v, err
+}

pkg/neotest/chain/chain.go

@@ -0,0 +1,50 @@
+package chain
+
+import (
+	"encoding/hex"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/config"
+	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
+	"github.com/nspcc-dev/neo-go/pkg/core"
+	"github.com/nspcc-dev/neo-go/pkg/core/storage"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/wallet"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap/zaptest"
+)
+
+const validatorWIF = "KxyjQ8eUa4FHt3Gvioyt1Wz29cTUrE4eTqX3yFSk1YFCsPL8uNsY"
+
+// committeeAcc is an account used to sign tx as a committee.
+var committeeAcc *wallet.Account
+
+func init() {
+	committeeAcc, _ = wallet.NewAccountFromWIF(validatorWIF)
+	pubs := keys.PublicKeys{committeeAcc.PrivateKey().PublicKey()}
+	err := committeeAcc.ConvertMultisig(1, pubs)
+	if err != nil {
+		panic(err)
+	}
+}
+
+// NewSingle creates new blockchain instance with a single validator and
+// setups cleanup functions.
+func NewSingle(t *testing.T) (*core.Blockchain, *wallet.Account) {
+	protoCfg := config.ProtocolConfiguration{
+		Magic:              netmode.UnitTestNet,
+		SecondsPerBlock:    1,
+		StandbyCommittee:   []string{hex.EncodeToString(committeeAcc.PrivateKey().PublicKey().Bytes())},
+		ValidatorsCount:    1,
+		VerifyBlocks:       true,
+		VerifyTransactions: true,
+	}
+
+	st := storage.NewMemoryStore()
+	log := zaptest.NewLogger(t)
+	bc, err := core.NewBlockchain(st, protoCfg, log)
+	require.NoError(t, err)
+	go bc.Run()
+	t.Cleanup(bc.Close)
+	return bc, committeeAcc
+}

pkg/neotest/compile.go

@@ -0,0 +1,85 @@
+package neotest
+
+import (
+	"io"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/cli/smartcontract"
+	"github.com/nspcc-dev/neo-go/pkg/compiler"
+	"github.com/nspcc-dev/neo-go/pkg/config"
+	"github.com/nspcc-dev/neo-go/pkg/core/state"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/nef"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/stretchr/testify/require"
+)
+
+// Contract contains contract info for deployment.
+type Contract struct {
+	Hash     util.Uint160
+	NEF      *nef.File
+	Manifest *manifest.Manifest
+}
+
+// contracts caches compiled contracts from FS across multiple tests.
+var contracts = make(map[string]*Contract)
+
+// CompileSource compiles contract from reader and returns it's NEF, manifest and hash.
+func CompileSource(t *testing.T, sender util.Uint160, src io.Reader, opts *compiler.Options) *Contract {
+	// nef.NewFile() cares about version a lot.
+	config.Version = "neotest"
+
+	avm, di, err := compiler.CompileWithDebugInfo(opts.Name, src)
+	require.NoError(t, err)
+
+	ne, err := nef.NewFile(avm)
+	require.NoError(t, err)
+
+	m, err := compiler.CreateManifest(di, opts)
+	require.NoError(t, err)
+
+	return &Contract{
+		Hash:     state.CreateContractHash(sender, ne.Checksum, m.Name),
+		NEF:      ne,
+		Manifest: m,
+	}
+}
+
+// CompileFile compiles contract from file and returns it's NEF, manifest and hash.
+func CompileFile(t *testing.T, sender util.Uint160, srcPath string, configPath string) *Contract {
+	if c, ok := contracts[srcPath]; ok {
+		return c
+	}
+
+	// nef.NewFile() cares about version a lot.
+	config.Version = "neotest"
+
+	avm, di, err := compiler.CompileWithDebugInfo(srcPath, nil)
+	require.NoError(t, err)
+
+	ne, err := nef.NewFile(avm)
+	require.NoError(t, err)
+
+	conf, err := smartcontract.ParseContractConfig(configPath)
+	require.NoError(t, err)
+
+	o := &compiler.Options{}
+	o.Name = conf.Name
+	o.ContractEvents = conf.Events
+	o.ContractSupportedStandards = conf.SupportedStandards
+	o.Permissions = make([]manifest.Permission, len(conf.Permissions))
+	for i := range conf.Permissions {
+		o.Permissions[i] = manifest.Permission(conf.Permissions[i])
+	}
+	o.SafeMethods = conf.SafeMethods
+	m, err := compiler.CreateManifest(di, o)
+	require.NoError(t, err)
+
+	c := &Contract{
+		Hash:     state.CreateContractHash(sender, ne.Checksum, m.Name),
+		NEF:      ne,
+		Manifest: m,
+	}
+	contracts[srcPath] = c
+	return c
+}