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path: root/dex/app_test.go
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package dex

import (
    "crypto/ecdsa"
    "fmt"
    "math/big"
    "math/rand"
    "reflect"
    "sync"
    "testing"
    "time"

    coreCommon "github.com/dexon-foundation/dexon-consensus/common"
    coreCrypto "github.com/dexon-foundation/dexon-consensus/core/crypto"
    coreEcdsa "github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa"
    coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
    "github.com/dexon-foundation/dexon/common"
    "github.com/dexon-foundation/dexon/common/math"
    "github.com/dexon-foundation/dexon/consensus/dexcon"
    "github.com/dexon-foundation/dexon/core"
    "github.com/dexon-foundation/dexon/core/rawdb"
    "github.com/dexon-foundation/dexon/core/types"
    "github.com/dexon-foundation/dexon/core/vm"
    "github.com/dexon-foundation/dexon/crypto"
    "github.com/dexon-foundation/dexon/ethdb"
    "github.com/dexon-foundation/dexon/event"
    "github.com/dexon-foundation/dexon/rlp"
)

type singnal int

const (
    runFail singnal = iota
    runSuccess
)

type App interface {
    PreparePayload(position coreTypes.Position) (payload []byte, err error)
    PrepareWitness(height uint64) (witness coreTypes.Witness, err error)
    VerifyBlock(block *coreTypes.Block) coreTypes.BlockVerifyStatus
    BlockConfirmed(block coreTypes.Block)
    BlockDelivered(blockHash coreCommon.Hash, position coreTypes.Position, rand []byte)
    SubscribeNewFinalizedBlockEvent(ch chan<- core.NewFinalizedBlockEvent) event.Subscription
    Stop()
}

type Product interface{}

type Tester interface {
    // Name the name of tester
    Name() string

    // ViewAndRecord view the data and record then start when requirement is ready.
    ViewAndRecord(product Product)

    // ReadyToTest check tester is ready or not.
    ReadyToTest() bool

    // InputsForTest return the inputs which we want to test, it will be called only when it is get ready.
    InputsForTest(product Product) []reflect.Value

    // ValidateResults validate the results what we expected.
    ValidateResults(results []reflect.Value) error

    // Done return true when tester finish it job.
    Done() bool

    // StopTime lock all working jobs for test and rollback data if necessary.
    StopTime() bool

    // Rollback rollback data in the final.
    Rollback() error
}

type baseTester struct {
    App

    ready bool

    testTimer    *time.Timer
    testInterval time.Duration

    counter   int
    threshold int

    self interface{}
}

func (t baseTester) Name() string {
    return reflect.TypeOf(t.self).Name()
}

func (t baseTester) ReadyToTest() bool {
    return t.ready
}

func (t baseTester) Done() bool {
    return t.counter >= t.threshold
}

func (t baseTester) StopTime() bool {
    return false
}

func (t *baseTester) Rollback() error {
    return nil
}

func (t *baseTester) ViewAndRecord(product Product) {
    panic("need to implement")
}

func (t baseTester) InputsForTest(product Product) []reflect.Value {
    panic("need to implement")
}

func (t *baseTester) ValidateResults(results []reflect.Value) error {
    panic("need to implement")
}

type takerName string

type makerName string

type ProductCenter struct {
    takerChan map[takerName]chan Product

    takerList map[makerName]map[takerName]struct{}
}

// RequestProduct make a blocking request the product from maker.
func (center *ProductCenter) RequestProduct(tName takerName) Product {
    p := <-center.takerChan[tName]
    return p
}

// DeliverProduct deliver product for takers.
func (center *ProductCenter) DeliverProduct(mName makerName, product Product) {
    for tName := range center.takerList[mName] {
        center.takerChan[tName] <- product
    }
}

// Register build the connection between taker and maker.
func (center *ProductCenter) Register(tName takerName, mName ...makerName) {
    center.takerChan[tName] = make(chan Product, 1000)

    for _, n := range mName {
        if _, exist := center.takerList[n]; !exist {
            center.takerList[n] = make(map[takerName]struct{})
            center.takerList[n][tName] = struct{}{}
        } else {
            center.takerList[n][tName] = struct{}{}
        }
    }
}

func (center ProductCenter) New() *ProductCenter {
    center.takerChan = map[takerName]chan Product{}
    center.takerList = map[makerName]map[takerName]struct{}{}
    return &center
}

type FactoryBase struct {
    App

    targetFunc interface{}

    name string

    center *ProductCenter

    testers []Tester

    status chan map[singnal]interface{}

    stopTimeMu *sync.RWMutex
}

func (base *FactoryBase) testerDoWork(product Product) error {
    for _, t := range base.testers {
        if t.Done() {
            continue
        }

        if err := func() (tErr error) {
            var returns []reflect.Value
            defer func() {
                r := recover()
                if r != nil {
                    returns = append(returns, reflect.ValueOf(fmt.Errorf("%v", r)))
                }

                if t.ReadyToTest() {
                    err := t.ValidateResults(returns)
                    if err != nil {
                        tErr = err
                        return
                    }

                    err = t.Rollback()
                    if err != nil {
                        tErr = fmt.Errorf("recover fail: %v", tErr)
                        return
                    }
                } else if r != nil {
                    tErr = fmt.Errorf("%v", r)
                }

                if t.StopTime() {
                    base.stopTimeMu.Unlock()
                } else {
                    base.stopTimeMu.RUnlock()
                }
            }()

            if t.StopTime() {
                base.stopTimeMu.Lock()
            } else {
                base.stopTimeMu.RLock()
            }
            t.ViewAndRecord(product)
            if t.ReadyToTest() {
                inputs := t.InputsForTest(product)
                returns = reflect.ValueOf(base.targetFunc).Call(inputs)
            }
            return
        }(); err != nil {
            return fmt.Errorf("%s: %v", t.Name(), err)
        }
    }

    return nil
}

func (base *FactoryBase) testerAllDone() bool {
    for _, t := range base.testers {
        if !t.Done() {
            return false
        }
    }

    return true
}

func (base *FactoryBase) notifySuccess() {
    base.status <- map[singnal]interface{}{runSuccess: nil}
}

func (base *FactoryBase) notifyFail(msg interface{}) {
    base.status <- map[singnal]interface{}{runFail: msg}
}

type ConfigFactory struct {
    FactoryBase

    initialized bool

    sleepTime time.Duration

    masterKey *ecdsa.PrivateKey
}

func (f *ConfigFactory) Run() {
    for {
        if !f.initialized {
            // Initial block for first round.
            go f.center.DeliverProduct(makerName(f.name),
                &PositionProduct{position: coreTypes.Position{
                    Round:  0,
                    Height: coreTypes.GenesisHeight,
                }})

            f.initialized = true
            continue
        }

        time.Sleep(f.sleepTime)

        product := f.center.RequestProduct(takerName(f.name))
        position := f.covertProduct(product)
        position.Height++

        if f.roundStartAt(position.Round+1) == position.Height {
            position.Round = position.Round + 1
        }

        go f.center.DeliverProduct(makerName(f.name), &PositionProduct{
            position: position,
        })
    }
}

func (f ConfigFactory) covertProduct(product interface{}) coreTypes.Position {
    var position coreTypes.Position
    switch product.(type) {
    case *BlockConfirmedProduct:
        position = product.(*BlockConfirmedProduct).block.Position
    default:
        panic(fmt.Errorf("unexpected type %T", product))
    }

    return position
}

func (f *ConfigFactory) roundStartAt(round uint64) uint64 {
    dexonApp := f.App.(*DexconApp)
    start := uint64(0)
    for i := uint64(0); i < round; i++ {
        start += dexonApp.gov.Configuration(i).RoundLength
    }

    return start - 1
}

func (f ConfigFactory) New(app App, center *ProductCenter, stopTimeMu *sync.RWMutex, masterKey *ecdsa.PrivateKey) *ConfigFactory {
    f.FactoryBase = FactoryBase{
        App:        app,
        name:       reflect.TypeOf(f).Name(),
        center:     center,
        stopTimeMu: stopTimeMu,
    }
    f.sleepTime = 250 * time.Millisecond
    f.masterKey = masterKey
    f.center.Register(takerName(f.name), makerName(reflect.TypeOf(BlockConfirmedFactory{}).Name()))
    return &f
}

type PositionProduct struct {
    position coreTypes.Position
}

type PreparePayloadFactory struct {
    FactoryBase
}

func (f *PreparePayloadFactory) Run() {
    defer func() {
        if r := recover(); r != nil {
            f.notifyFail(r)
        }
    }()

    for {
        product := f.center.RequestProduct(takerName(f.name))

        if len(f.testers) > 0 && f.testerAllDone() {
            f.notifySuccess()
            f.testers = nil
        } else if err := f.testerDoWork(product); err != nil {
            panic(fmt.Errorf("test fail: %v", err))
        }

        go func() {
            defer func() {
                if r := recover(); r != nil {
                    f.notifyFail(r)
                }
            }()

            position := f.covertProduct(product)
            f.stopTimeMu.RLock()
            payload, err := f.App.PreparePayload(position)
            if err != nil {
                panic(err)
            }
            f.stopTimeMu.RUnlock()

            go f.center.DeliverProduct(makerName(f.name), &PreparePayloadProduct{
                position: position,
                payload:  payload,
            })
        }()
    }
}

func (f PreparePayloadFactory) covertProduct(product interface{}) coreTypes.Position {
    var position coreTypes.Position
    switch product.(type) {
    case *PositionProduct:
        position = product.(*PositionProduct).position
    default:
        panic(fmt.Errorf("unexpected type %T", product))
    }

    return position
}

func (f PreparePayloadFactory) New(app App, center *ProductCenter, stopTimeMu *sync.RWMutex) *PreparePayloadFactory {
    f.FactoryBase = FactoryBase{
        App:        app,
        name:       reflect.TypeOf(f).Name(),
        center:     center,
        targetFunc: app.PreparePayload,
        status:     make(chan map[singnal]interface{}, 1),
        stopTimeMu: stopTimeMu,
    }
    f.center.Register(takerName(f.name), makerName(reflect.TypeOf(ConfigFactory{}).Name()))
    return &f
}

func (f PreparePayloadFactory) NewWithTester(app App, center *ProductCenter, stopTimeMu *sync.RWMutex) *PreparePayloadFactory {
    factory := f.New(app, center, stopTimeMu)
    factory.testers = []Tester{
        ppBlockLimitTester{}.New(app, 10, 3, 3),
        ppBlockHeightTester{}.New(app, 20, 3, 3),
    }
    return factory
}

type PreparePayloadProduct struct {
    position coreTypes.Position
    payload  []byte
}

type ppBlockLimitTester struct {
    baseTester

    round uint64
}

func (t ppBlockLimitTester) New(app App, startAt, interval, threshold int) *ppBlockLimitTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *ppBlockLimitTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PositionProduct:
            t.round = product.(*PositionProduct).position.Round
            t.ready = true
        }

        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t ppBlockLimitTester) InputsForTest(product Product) []reflect.Value {
    return []reflect.Value{reflect.ValueOf(product.(*PositionProduct).position)}
}

func (t *ppBlockLimitTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 2 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[1].Interface().(type) {
    case nil:
    case error:
        return fmt.Errorf("result[1] must nil: %v", results[1].Interface())
    default:
        return fmt.Errorf("unexpect results[1] return type %T", results[1].Interface())
    }

    switch results[0].Interface().(type) {
    case []byte:
        if results[0].Bytes() != nil {
            var txs []*types.Transaction
            err := rlp.DecodeBytes(results[0].Bytes(), &txs)
            if err != nil {
                return fmt.Errorf("rlp decode error: %v", err)
            }

            app := t.App.(*DexconApp)
            blockLimit := app.gov.DexconConfiguration(t.round).BlockGasLimit
            totalGas := uint64(0)
            for _, tx := range txs {
                totalGas += tx.Gas()
            }

            if blockLimit < totalGas {
                return fmt.Errorf("total cost larger than block limit %d < %d", blockLimit, totalGas)
            }

            t.counter++
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.ready = false
    return nil
}

type ppBlockHeightTester struct {
    baseTester

    height uint64
}

func (t ppBlockHeightTester) New(app App, startAt, interval, threshold int) *ppBlockHeightTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *ppBlockHeightTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PositionProduct:
            t.height = product.(*PositionProduct).position.Height
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t ppBlockHeightTester) InputsForTest(product Product) []reflect.Value {
    position := product.(*PositionProduct).position
    position.Height--
    return []reflect.Value{reflect.ValueOf(position)}
}

func (t *ppBlockHeightTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 2 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[1].Interface().(type) {
    case error:
        expectErr := fmt.Sprintf("expected height %d but get %d", t.height, t.height-1)
        if results[1].Interface().(error).Error() != expectErr {
            return fmt.Errorf("unexpected error msg: %v", results[1].Interface())
        }
    default:
        return fmt.Errorf("unexpect results[1] return type %T", results[1].Interface())
    }

    switch results[0].Interface().(type) {
    case []byte:
        if results[0].Bytes() != nil {
            return fmt.Errorf("payload should be nil")
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.ready = false
    t.counter++
    return nil
}

type PrepareWitnessFactory struct {
    FactoryBase
}

func (f *PrepareWitnessFactory) Run() {
    defer func() {
        if r := recover(); r != nil {
            f.notifyFail(r)
        }
    }()

    for {
        product := f.center.RequestProduct(takerName(f.name))

        if len(f.testers) > 0 && f.testerAllDone() {
            f.notifySuccess()
            f.testers = nil
        } else if err := f.testerDoWork(product); err != nil {
            panic(fmt.Errorf("test fail: %v", err))
        }

        go func() {
            defer func() {
                if r := recover(); r != nil {
                    f.notifyFail(r)
                }
            }()

            f.stopTimeMu.RLock()
            witness, err := f.App.PrepareWitness(f.App.(*DexconApp).blockchain.CurrentBlock().NumberU64())
            if err != nil {
                panic(err)
            }
            f.stopTimeMu.RUnlock()

            position, payload := f.convertProduct(product)
            go f.center.DeliverProduct(makerName(f.name), &PrepareWitnessProduct{
                block: coreTypes.Block{
                    Hash:        coreCommon.NewRandomHash(),
                    ProposerID:  coreTypes.NodeID{coreCommon.Hash{1, 2, 3}},
                    Position:    position,
                    Witness:     witness,
                    Payload:     payload,
                    PayloadHash: coreCrypto.Keccak256Hash(payload),
                },
            })
        }()
    }
}

func (f PrepareWitnessFactory) convertProduct(product Product) (coreTypes.Position, []byte) {
    var (
        position coreTypes.Position
        payload  []byte
    )
    switch product.(type) {
    case *PreparePayloadProduct:
        realProduct := product.(*PreparePayloadProduct)
        position = realProduct.position
        payload = realProduct.payload
    default:
        panic(fmt.Errorf("unexpected type %T", product))
    }

    return position, payload
}

func (f PrepareWitnessFactory) New(app App, center *ProductCenter, stopTimeMu *sync.RWMutex) *PrepareWitnessFactory {
    f.FactoryBase = FactoryBase{
        App:        app,
        name:       reflect.TypeOf(f).Name(),
        center:     center,
        targetFunc: app.PrepareWitness,
        status:     make(chan map[singnal]interface{}, 1),
        stopTimeMu: stopTimeMu,
    }
    f.center.Register(takerName(f.name), makerName(reflect.TypeOf(PreparePayloadFactory{}).Name()))
    return &f
}

func (f PrepareWitnessFactory) NewWithTester(app App, center *ProductCenter, stopTimeMu *sync.RWMutex) *PrepareWitnessFactory {
    factory := f.New(app, center, stopTimeMu)
    factory.testers = []Tester{
        pwConsensusHeightTester{}.New(app, 10, 10, 3),
    }

    return factory
}

type PrepareWitnessProduct struct {
    block coreTypes.Block
}

type pwConsensusHeightTester struct {
    baseTester
}

func (t pwConsensusHeightTester) New(app App, startAt, interval, threshold int) *pwConsensusHeightTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *pwConsensusHeightTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        t.ready = true
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t pwConsensusHeightTester) InputsForTest(product Product) []reflect.Value {
    return []reflect.Value{reflect.ValueOf(uint64(99999))}
}

func (t *pwConsensusHeightTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 2 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[1].Interface().(type) {
    case nil:
        return fmt.Errorf("results[1] must not nil")
    case error:
        if results[1].Interface().(error).Error() != "current height < consensus height" {
            return fmt.Errorf("unexpected error: %v", results[1].Interface())
        }
    default:
        return fmt.Errorf("unexpect results[1] return type %T", results[1].Interface())
    }

    switch results[0].Interface().(type) {
    case coreTypes.Witness:
        witness := results[0].Interface().(coreTypes.Witness)
        if witness.Height != 0 || len(witness.Data) > 0 {
            return fmt.Errorf("unexpected results[1] return %+v", results[0].Interface())
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type VerifyBlockFactory struct {
    FactoryBase
}

func (f *VerifyBlockFactory) Run() {
    defer func() {
        if r := recover(); r != nil {
            f.notifyFail(r)
        }
    }()

    for {
        product := f.center.RequestProduct(takerName(f.name))

        if len(f.testers) > 0 && f.testerAllDone() {
            f.notifySuccess()
            f.testers = nil
        } else if err := f.testerDoWork(product); err != nil {
            panic(fmt.Errorf("test fail: %v", err))
        }

        go func() {
            defer func() {
                if r := recover(); r != nil {
                    f.notifyFail(r)
                }
            }()

            block := f.convertProduct(product)

            f.stopTimeMu.RLock()
            if status := f.App.VerifyBlock(&block); status != coreTypes.VerifyOK {
                panic(fmt.Errorf("verify block fail: status %v", status))
            }
            f.stopTimeMu.RUnlock()

            go f.center.DeliverProduct(makerName(f.name), &VerifyBlockProduct{
                block: block,
            })
        }()
    }
}

func (f VerifyBlockFactory) convertProduct(product Product) coreTypes.Block {
    var block coreTypes.Block
    switch product.(type) {
    case *PrepareWitnessProduct:
        block = product.(*PrepareWitnessProduct).block
    default:
        panic(fmt.Errorf("unexpected type %T", product))
    }

    return block
}

func (f VerifyBlockFactory) New(app App, center *ProductCenter, stopTimeMu *sync.RWMutex) *VerifyBlockFactory {
    f.FactoryBase = FactoryBase{
        App:        app,
        name:       reflect.TypeOf(f).Name(),
        center:     center,
        targetFunc: app.VerifyBlock,
        status:     make(chan map[singnal]interface{}, 1),
        stopTimeMu: stopTimeMu,
    }
    f.center.Register(takerName(f.name), makerName(reflect.TypeOf(PrepareWitnessFactory{}).Name()))
    return &f
}

func (f VerifyBlockFactory) NewWithTester(app App, center *ProductCenter, masterKey *ecdsa.PrivateKey,
    stopTimeMu *sync.RWMutex) *VerifyBlockFactory {
    factory := f.New(app, center, stopTimeMu)
    factory.testers = []Tester{
        vbWitnessDataDecodeTester{}.New(app, 10, 5, 3),
        vbWitnessHeightTester{}.New(app, 20, 5, 3),
        vbWitnessDataTester{}.New(app, 30, 5, 3),
        vbBlockHeightTester{}.New(app, 40, 3, 3),
        vbPayloadDecodeTester{}.New(app, 50, 5, 3),
        vbTxNonceSequenceTester{}.New(app, masterKey, 60, 5, 3),
        vbTxNonceIncrementTester{}.New(app, masterKey, 70, 5, 3),
        vbTxIntrinsicGasTester{}.New(app, masterKey, 80, 5, 3),
        vbTxGasTooLowTester{}.New(app, masterKey, 90, 5, 3),
        vbTxInvalidGasPriceTester{}.New(app, masterKey, 100, 5, 3),
        vbInsufficientFundsTester{}.New(app, 110, 5, 3),
        vbBlockLimitTester{}.New(app, 120, 5, 3),
    }

    return factory
}

type VerifyBlockProduct struct {
    block coreTypes.Block
}

type vbWitnessDataDecodeTester struct {
    baseTester
}

func (t vbWitnessDataDecodeTester) New(app App, startAt, interval, threshold int) *vbWitnessDataDecodeTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *vbWitnessDataDecodeTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbWitnessDataDecodeTester) InputsForTest(product Product) []reflect.Value {
    block := product.(*PrepareWitnessProduct).block
    block.Witness.Data = make([]byte, 100)
    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbWitnessDataDecodeTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        if results[0].Interface().(coreTypes.BlockVerifyStatus) != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpected status %v", results[0].Interface())
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbWitnessHeightTester struct {
    baseTester
}

func (t vbWitnessHeightTester) New(app App, startAt, interval, threshold int) *vbWitnessHeightTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *vbWitnessHeightTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbWitnessHeightTester) InputsForTest(product Product) []reflect.Value {
    block := product.(*PrepareWitnessProduct).block
    block.Witness.Height += uint64(rand.New(rand.NewSource(time.Now().UnixNano())).Intn(10) + 1)
    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbWitnessHeightTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        if results[0].Interface().(coreTypes.BlockVerifyStatus) != coreTypes.VerifyRetryLater {
            return fmt.Errorf("unexpected status %v", results[0].Interface())
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbWitnessDataTester struct {
    baseTester
}

func (t vbWitnessDataTester) New(app App, startAt, interval, threshold int) *vbWitnessDataTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *vbWitnessDataTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbWitnessDataTester) InputsForTest(product Product) []reflect.Value {
    block := product.(*PrepareWitnessProduct).block
    randNum := big.NewInt(rand.New(rand.NewSource(time.Now().UnixNano())).Int63())
    var err error
    block.Witness.Data, err = rlp.EncodeToBytes(common.BigToHash(randNum))
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbWitnessDataTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        if results[0].Interface().(coreTypes.BlockVerifyStatus) != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpected status %v", results[0].Interface())
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbBlockHeightTester struct {
    baseTester
}

func (t vbBlockHeightTester) New(app App, startAt, interval, threshold int) *vbBlockHeightTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *vbBlockHeightTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbBlockHeightTester) InputsForTest(product Product) []reflect.Value {
    block := product.(*PrepareWitnessProduct).block
    block.Position.Height--
    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbBlockHeightTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        if results[0].Interface().(coreTypes.BlockVerifyStatus) != coreTypes.VerifyRetryLater {
            return fmt.Errorf("unexpected status %v", results[0].Interface())
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbPayloadDecodeTester struct {
    baseTester
}

func (t vbPayloadDecodeTester) New(app App, startAt, interval, threshold int) *vbPayloadDecodeTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *vbPayloadDecodeTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbPayloadDecodeTester) InputsForTest(product Product) []reflect.Value {
    block := product.(*PrepareWitnessProduct).block
    block.Payload = []byte{0x00}
    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbPayloadDecodeTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbTxNonceSequenceTester struct {
    baseTester

    key *ecdsa.PrivateKey
}

func (t vbTxNonceSequenceTester) New(app App, key *ecdsa.PrivateKey, startAt, interval,
    threshold int) *vbTxNonceSequenceTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    t.key = key
    return &t
}

func (t *vbTxNonceSequenceTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbTxNonceSequenceTester) InputsForTest(product Product) []reflect.Value {
    app := t.App.(*DexconApp)
    block := product.(*PrepareWitnessProduct).block
    var err error

    blockchain := app.blockchain
    signer := types.NewEIP155Signer(blockchain.Config().ChainID)
    var txs []*types.Transaction
    for i := uint64(0); i < 3; i++ {
        if i == 1 {
            continue
        }

        tx, err := types.SignTx(
            types.NewTransaction(i, common.Address{}, nil, 21000, new(big.Int).SetInt64(1e9), nil), signer, t.key)
        if err != nil {
            panic(err)
        }
        txs = append(txs, tx)
    }

    block.Payload, err = rlp.EncodeToBytes(txs)
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbTxNonceSequenceTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbTxNonceIncrementTester struct {
    baseTester

    key *ecdsa.PrivateKey
}

func (t vbTxNonceIncrementTester) New(app App, key *ecdsa.PrivateKey, startAt, interval,
    threshold int) *vbTxNonceIncrementTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    t.key = key
    return &t
}

func (t *vbTxNonceIncrementTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbTxNonceIncrementTester) InputsForTest(product Product) []reflect.Value {
    app := t.App.(*DexconApp)
    block := product.(*PrepareWitnessProduct).block
    var err error

    blockchain := app.blockchain
    signer := types.NewEIP155Signer(blockchain.Config().ChainID)
    var txs []*types.Transaction
    for i := uint64(1); i < 4; i++ {
        tx, err := types.SignTx(
            types.NewTransaction(i, common.Address{}, nil, 21000, new(big.Int).SetInt64(1e9), nil), signer, t.key)
        if err != nil {
            panic(err)
        }
        txs = append(txs, tx)
    }

    block.Payload, err = rlp.EncodeToBytes(txs)
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbTxNonceIncrementTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbTxIntrinsicGasTester struct {
    baseTester

    key *ecdsa.PrivateKey
}

func (t vbTxIntrinsicGasTester) New(app App, key *ecdsa.PrivateKey, startAt, interval,
    threshold int) *vbTxIntrinsicGasTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    t.key = key
    return &t
}

func (t *vbTxIntrinsicGasTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbTxIntrinsicGasTester) InputsForTest(product Product) []reflect.Value {
    app := t.App.(*DexconApp)
    block := product.(*PrepareWitnessProduct).block
    var err error

    blockchain := app.blockchain
    signer := types.NewEIP155Signer(blockchain.Config().ChainID)
    var txs []*types.Transaction
    for i := uint64(0); i < 3; i++ {
        tx, err := types.SignTx(types.NewTransaction(i, common.Address{}, nil, 10000, new(big.Int).SetInt64(1e9), nil),
            signer, t.key)
        if err != nil {
            panic(err)
        }
        txs = append(txs, tx)
    }

    block.Payload, err = rlp.EncodeToBytes(txs)
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbTxIntrinsicGasTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbTxGasTooLowTester struct {
    baseTester

    key *ecdsa.PrivateKey
}

func (t vbTxGasTooLowTester) New(app App, key *ecdsa.PrivateKey, startAt, interval,
    threshold int) *vbTxGasTooLowTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    t.key = key
    return &t
}

func (t *vbTxGasTooLowTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbTxGasTooLowTester) InputsForTest(product Product) []reflect.Value {
    app := t.App.(*DexconApp)
    block := product.(*PrepareWitnessProduct).block
    var err error

    blockchain := app.blockchain
    signer := types.NewEIP155Signer(blockchain.Config().ChainID)
    var txs []*types.Transaction
    for i := uint64(0); i < 3; i++ {
        tx, err := types.SignTx(
            types.NewTransaction(i, common.Address{}, nil, 21000, new(big.Int).SetInt64(1e9), []byte{0x00}), signer, t.key)
        if err != nil {
            panic(err)
        }
        txs = append(txs, tx)
    }

    block.Payload, err = rlp.EncodeToBytes(txs)
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbTxGasTooLowTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbTxInvalidGasPriceTester struct {
    baseTester

    key *ecdsa.PrivateKey
}

func (t vbTxInvalidGasPriceTester) New(app App, key *ecdsa.PrivateKey, startAt, interval,
    threshold int) *vbTxInvalidGasPriceTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    t.key = key
    return &t
}

func (t *vbTxInvalidGasPriceTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbTxInvalidGasPriceTester) InputsForTest(product Product) []reflect.Value {
    app := t.App.(*DexconApp)
    block := product.(*PrepareWitnessProduct).block
    var err error

    blockchain := app.blockchain
    signer := types.NewEIP155Signer(blockchain.Config().ChainID)
    var txs []*types.Transaction
    for i := uint64(0); i < 3; i++ {
        tx, err := types.SignTx(
            types.NewTransaction(i, common.Address{}, nil, 21000, new(big.Int).SetInt64(1e8), nil), signer, t.key)
        if err != nil {
            panic(err)
        }
        txs = append(txs, tx)
    }

    block.Payload, err = rlp.EncodeToBytes(txs)
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbTxInvalidGasPriceTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbInsufficientFundsTester struct {
    baseTester
}

func (t vbInsufficientFundsTester) New(app App, startAt, interval, threshold int) *vbInsufficientFundsTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *vbInsufficientFundsTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbInsufficientFundsTester) InputsForTest(product Product) []reflect.Value {
    app := t.App.(*DexconApp)
    block := product.(*PrepareWitnessProduct).block
    key, err := crypto.GenerateKey()
    if err != nil {
        panic(err)
    }

    blockchain := app.blockchain
    signer := types.NewEIP155Signer(blockchain.Config().ChainID)
    var txs []*types.Transaction
    for i := uint64(0); i < 3; i++ {
        tx, err := types.SignTx(
            types.NewTransaction(i, common.Address{}, big.NewInt(1), 21000, new(big.Int).SetInt64(1e9), nil), signer, key)
        if err != nil {
            panic(err)
        }
        txs = append(txs, tx)
    }

    block.Payload, err = rlp.EncodeToBytes(txs)
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbInsufficientFundsTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type vbBlockLimitTester struct {
    baseTester
}

func (t vbBlockLimitTester) New(app App, startAt, interval, threshold int) *vbBlockLimitTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *vbBlockLimitTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *PrepareWitnessProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t vbBlockLimitTester) InputsForTest(product Product) []reflect.Value {
    app := t.App.(*DexconApp)
    block := product.(*PrepareWitnessProduct).block
    key, err := crypto.GenerateKey()
    if err != nil {
        panic(err)
    }

    blockchain := app.blockchain
    signer := types.NewEIP155Signer(blockchain.Config().ChainID)
    var txs []*types.Transaction
    for i := uint64(0); i < 3; i++ {
        tx, err := types.SignTx(types.NewTransaction(i, common.Address{}, nil, 10e10, new(big.Int).SetInt64(1e9), nil),
            signer, key)
        if err != nil {
            panic(err)
        }
        txs = append(txs, tx)
    }

    block.Payload, err = rlp.EncodeToBytes(txs)
    if err != nil {
        panic(err)
    }

    return []reflect.Value{reflect.ValueOf(&block)}
}

func (t *vbBlockLimitTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case coreTypes.BlockVerifyStatus:
        status := results[0].Interface().(coreTypes.BlockVerifyStatus)
        if status != coreTypes.VerifyInvalidBlock {
            return fmt.Errorf("unexpect status %v", status)
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type BlockConfirmedFactory struct {
    FactoryBase

    masterKey *coreEcdsa.PrivateKey
}

func (f *BlockConfirmedFactory) Run() {
    defer func() {
        if r := recover(); r != nil {
            f.notifyFail(r)
        }
    }()

    for {
        product := f.center.RequestProduct(takerName(f.name))

        if len(f.testers) > 0 && f.testerAllDone() {
            f.notifySuccess()
            f.testers = nil
        } else if err := f.testerDoWork(product); err != nil {
            panic(fmt.Errorf("test fail: %v", err))
        }

        go func() {
            defer func() {
                if r := recover(); r != nil {
                    f.notifyFail(r)
                }
            }()

            block := f.convertProduct(product)
            block.ProposerID = coreTypes.NewNodeID(f.masterKey.PublicKey())
            block.Timestamp = time.Now()
            f.stopTimeMu.RLock()
            f.App.BlockConfirmed(block)
            f.stopTimeMu.RUnlock()

            f.center.DeliverProduct(makerName(f.name), &BlockConfirmedProduct{
                block: block,
            })
        }()
    }
}

func (f BlockConfirmedFactory) convertProduct(product Product) coreTypes.Block {
    var block coreTypes.Block
    switch product.(type) {
    case *VerifyBlockProduct:
        block = product.(*VerifyBlockProduct).block
    default:
        panic(fmt.Errorf("unexpected type %T", product))
    }

    return block
}

func (f BlockConfirmedFactory) New(app App, center *ProductCenter, stopTimeMu *sync.RWMutex,
    masterKey *ecdsa.PrivateKey) *BlockConfirmedFactory {
    f.FactoryBase = FactoryBase{
        App:        app,
        name:       reflect.TypeOf(f).Name(),
        center:     center,
        targetFunc: app.BlockConfirmed,
        status:     make(chan map[singnal]interface{}, 1),
        stopTimeMu: stopTimeMu,
    }
    f.masterKey = coreEcdsa.NewPrivateKeyFromECDSA(masterKey)
    f.center.Register(takerName(f.name), makerName(reflect.TypeOf(VerifyBlockFactory{}).Name()))
    return &f
}

func (f BlockConfirmedFactory) NewWithTester(app App, center *ProductCenter, stopTimeMu *sync.RWMutex,
    masterKey *ecdsa.PrivateKey) *BlockConfirmedFactory {
    factory := f.New(app, center, stopTimeMu, masterKey)
    factory.testers = []Tester{
        bcBlockConfirmedTester{}.New(app, 30, 5, 3),
    }

    return factory
}

type BlockConfirmedProduct struct {
    block coreTypes.Block
}

type addInfo struct {
    nonce   *uint64
    cost    *big.Int
    counter *uint64
}

type bcBlockConfirmedTester struct {
    baseTester

    block          coreTypes.Block
    originAddrInfo map[common.Address]addInfo
}

func (t bcBlockConfirmedTester) New(app App, startAt, interval, threshold int) *bcBlockConfirmedTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    t.originAddrInfo = map[common.Address]addInfo{}
    return &t
}

func (t *bcBlockConfirmedTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *VerifyBlockProduct:
            t.block = product.(*VerifyBlockProduct).block
            var txs []*types.Transaction
            err := rlp.DecodeBytes(t.block.Payload, &txs)
            if err != nil {
                panic(err)
            } else if len(txs) > 0 {
                app := t.App.(*DexconApp)
                blockchain := app.blockchain
                for _, tx := range txs {
                    msg, err := tx.AsMessage(types.MakeSigner(blockchain.Config(), new(big.Int)))
                    if err != nil {
                        panic(err)
                    }

                    if _, exist := t.originAddrInfo[msg.From()]; !exist {
                        info := addInfo{}

                        nonce, exist := app.addressNonce[msg.From()]
                        if !exist {
                            info.nonce = nil
                        } else {
                            info.nonce = &nonce
                        }

                        cost, exist := app.addressCost[msg.From()]
                        if !exist {
                            info.cost = nil
                        } else {
                            info.cost = cost
                        }

                        counter, exist := app.addressCounter[msg.From()]
                        if !exist {
                            info.counter = nil
                        } else {
                            info.counter = &counter
                        }

                        t.originAddrInfo[msg.From()] = info
                    }
                }
                t.ready = true
            }
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t bcBlockConfirmedTester) InputsForTest(product Product) []reflect.Value {
    return []reflect.Value{reflect.ValueOf(product.(*VerifyBlockProduct).block)}
}

func (t *bcBlockConfirmedTester) ValidateResults(results []reflect.Value) error {
    if len(results) > 0 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    var expectTxs []*types.Transaction
    err := rlp.DecodeBytes(t.block.Payload, &expectTxs)
    if err != nil {
        return fmt.Errorf("rlp decode error: %v", err)
    }

    app := t.App.(*DexconApp)
    blockchain := app.blockchain
    block, cachedTxs := app.getConfirmedBlockByHash(t.block.Hash)
    if block == nil {
        return fmt.Errorf("block can not be nil")
    }

    if t.block.Hash != block.Hash {
        return fmt.Errorf("block hash not equal %v vs %v", t.block.Hash, block.Hash)
    }

    addrInfo := map[common.Address]*addInfo{}
    for i, tx := range expectTxs {
        if tx.Hash() != cachedTxs[i].Hash() {
            return fmt.Errorf("incorrect tx %+v vs %+v", tx, cachedTxs[i])
        }

        msg, err := tx.AsMessage(types.MakeSigner(blockchain.Config(), new(big.Int)))
        if err != nil {
            panic(err)
        }

        nonce := tx.Nonce()
        if info, exist := addrInfo[msg.From()]; !exist {
            counter := uint64(1)
            addrInfo[msg.From()] = &addInfo{nonce: &nonce, cost: tx.Cost(), counter: &counter}
        } else {
            info.nonce = &nonce
            info.cost = new(big.Int).Add(info.cost, tx.Cost())
        }
    }

    for addr, info := range addrInfo {

        var expectCost *big.Int
        var expectNonce uint64
        var expectCounter uint64
        if t.originAddrInfo[addr].cost == nil {
            expectCost = info.cost
        } else {
            expectCost = new(big.Int).Add(t.originAddrInfo[addr].cost, info.cost)
        }

        expectNonce = *info.nonce

        if t.originAddrInfo[addr].counter == nil {
            expectCounter = *info.counter
        } else {
            expectCounter = *t.originAddrInfo[addr].counter + *info.counter
        }

        cost, exist := app.addressCost[addr]
        counter, exist := app.addressCounter[addr]
        nonce, exist := app.addressNonce[addr]
        if !exist {
            return fmt.Errorf("cache in confirmed block is empty %v %v %v", cost, counter, nonce)
        }

        if cost.Cmp(expectCost) != 0 {
            return fmt.Errorf("incorrect cost expect %v but %v", expectCost, cost)
        }

        if counter != expectCounter {
            return fmt.Errorf("incorrect counter expect %v but %v", expectCounter, counter)
        }

        if nonce != expectNonce {
            return fmt.Errorf("incorrect nonce expect %v but %v", expectNonce, nonce)
        }
    }

    t.counter++
    t.ready = false
    return nil
}

func (t bcBlockConfirmedTester) StopTime() bool {
    return true
}

func (t *bcBlockConfirmedTester) Rollback() error {
    app := t.App.(*DexconApp)
    delete(app.confirmedBlocks, t.block.Hash)
    app.undeliveredNum--
    for addr, info := range t.originAddrInfo {
        if info.nonce == nil {
            delete(app.addressNonce, addr)
        } else {
            app.addressNonce[addr] = *info.nonce
        }

        if info.cost == nil {
            delete(app.addressCost, addr)
        } else {
            app.addressCost[addr] = info.cost
        }

        if info.cost == nil {
            delete(app.addressCounter, addr)
        } else {
            app.addressCounter[addr] = *info.counter
        }
    }

    t.originAddrInfo = map[common.Address]addInfo{}
    return nil
}

type BlockDeliveredFactory struct {
    FactoryBase
}

func (f *BlockDeliveredFactory) Run() {
    defer func() {
        if r := recover(); r != nil {
            f.notifyFail(r)
        }
    }()

    for {
        product := f.center.RequestProduct(takerName(f.name))

        if len(f.testers) > 0 && f.testerAllDone() {
            f.notifySuccess()
            f.testers = nil
        } else if err := f.testerDoWork(product); err != nil {
            panic(fmt.Errorf("test fail: %v", err))
        }

        block := f.convertProduct(product)
        f.stopTimeMu.RLock()
        f.App.BlockDelivered(block.Hash, block.Position, block.Randomness)
        f.stopTimeMu.RUnlock()
    }
}

func (f BlockDeliveredFactory) convertProduct(product Product) *coreTypes.Block {
    var block *coreTypes.Block
    switch product.(type) {
    case *BlockConfirmedProduct:
        block = &product.(*BlockConfirmedProduct).block
    default:
        panic(fmt.Errorf("unexpected type %T", product))
    }

    return block
}

func (f BlockDeliveredFactory) New(app App, center *ProductCenter, stopTimeMu *sync.RWMutex) *BlockDeliveredFactory {
    f.FactoryBase = FactoryBase{
        App:        app,
        name:       reflect.TypeOf(f).Name(),
        center:     center,
        targetFunc: app.BlockDelivered,
        status:     make(chan map[singnal]interface{}, 1),
        stopTimeMu: stopTimeMu,
    }
    f.center.Register(takerName(f.name), makerName(reflect.TypeOf(BlockConfirmedFactory{}).Name()))
    return &f
}

func (f BlockDeliveredFactory) NewWithTester(app App, center *ProductCenter,
    stopTimeMu *sync.RWMutex) *BlockDeliveredFactory {
    factory := f.New(app, center, stopTimeMu)
    factory.testers = []Tester{
        bdBlockHashTester{}.New(app, 30, 5, 3),
        bdBlockDeliveredTester{}.New(app, 60, 5, 3),
    }

    return factory
}

type bdBlockHashTester struct {
    baseTester
}

func (t bdBlockHashTester) New(app App, startAt, interval, threshold int) *bdBlockHashTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *bdBlockHashTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *BlockConfirmedProduct:
            t.ready = true
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t bdBlockHashTester) InputsForTest(product Product) []reflect.Value {
    block := product.(*BlockConfirmedProduct).block
    return []reflect.Value{reflect.ValueOf(coreCommon.Hash{}), reflect.ValueOf(block.Position),
        reflect.ValueOf(block.Randomness)}
}

func (t *bdBlockHashTester) ValidateResults(results []reflect.Value) error {
    if len(results) != 1 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    switch results[0].Interface().(type) {
    case error:
        if results[0].Interface().(error).Error() != "Can not get confirmed block" {
            return fmt.Errorf("unexpected error: %v", results[0].Interface().(error))
        }
    default:
        return fmt.Errorf("unexpect results[0] return type %T", results[0].Interface())
    }

    t.counter++
    t.ready = false
    return nil
}

type originalCache struct {
    confirmedBlocks map[coreCommon.Hash]*blockInfo
    addressNonce    map[common.Address]uint64
    addressCost     map[common.Address]*big.Int
    addressCounter  map[common.Address]uint64
}

type bdBlockDeliveredTester struct {
    baseTester

    expectHeight  uint64
    originalCache originalCache
    blockInfo     *blockInfo
}

func (t bdBlockDeliveredTester) New(app App, startAt, interval, threshold int) *bdBlockDeliveredTester {
    t.baseTester = baseTester{
        App:          app,
        testTimer:    time.NewTimer(time.Duration(startAt) * time.Second),
        testInterval: time.Duration(interval) * time.Second,
        threshold:    threshold,
        self:         t,
    }
    return &t
}

func (t *bdBlockDeliveredTester) ViewAndRecord(product Product) {
    select {
    case <-t.testTimer.C:
        switch product.(type) {
        case *BlockConfirmedProduct:
            app := t.App.(*DexconApp)
            block := product.(*BlockConfirmedProduct).block
            t.expectHeight = block.Position.Height
            var txs []*types.Transaction
            _, txs = app.getConfirmedBlockByHash(block.Hash)

            if len(txs) > 0 {
                t.originalCache.confirmedBlocks = map[coreCommon.Hash]*blockInfo{}
                for k, v := range app.confirmedBlocks {
                    t.originalCache.confirmedBlocks[k] = v
                }

                t.originalCache.addressNonce = map[common.Address]uint64{}
                for k, v := range app.addressNonce {
                    t.originalCache.addressNonce[k] = v
                }

                t.originalCache.addressCounter = map[common.Address]uint64{}
                for k, v := range app.addressCounter {
                    t.originalCache.addressCounter[k] = v
                }

                t.originalCache.addressCost = map[common.Address]*big.Int{}
                for k, v := range app.addressCost {
                    t.originalCache.addressCost[k] = v
                }

                t.blockInfo = app.confirmedBlocks[block.Hash]
                t.ready = true
            }
        }
        t.testTimer.Reset(t.testInterval)
    default:
    }
}

func (t bdBlockDeliveredTester) InputsForTest(product Product) []reflect.Value {
    block := product.(*BlockConfirmedProduct).block
    return []reflect.Value{reflect.ValueOf(block.Hash), reflect.ValueOf(block.Position),
        reflect.ValueOf(block.Randomness)}
}

func (t *bdBlockDeliveredTester) ValidateResults(results []reflect.Value) error {
    if len(results) != 0 {
        return fmt.Errorf("unexpected return values: %v", results)
    }

    app := t.App.(*DexconApp)
    if app.deliveredHeight != t.expectHeight {
        return fmt.Errorf("unexpected delivered height: expect %d but %d", t.expectHeight, app.deliveredHeight)
    }

    for addr, info := range t.blockInfo.addresses {
        if t.originalCache.addressCounter[addr] == 1 {
            _, exist := app.addressNonce[addr]
            if exist {
                return fmt.Errorf("nonce cache %v should not exist", addr)
            }

            _, exist = app.addressCost[addr]
            if exist {
                return fmt.Errorf("cost cache %v should not exist", addr)
            }

            _, exist = app.addressCounter[addr]
            if exist {
                return fmt.Errorf("counter cache %v should not exist", addr)
            }
            continue
        }

        if app.addressNonce[addr] != t.originalCache.addressNonce[addr] {
            return fmt.Errorf("nonce should not be affected")
        }

        expectCost := new(big.Int).Sub(t.originalCache.addressCost[addr], info.cost)
        if expectCost.Cmp(app.addressCost[addr]) != 0 {
            return fmt.Errorf("unexpected cost %v %v vs %v", addr, expectCost, app.addressCost[addr])
        }

        if app.addressCounter[addr]+1 != t.originalCache.addressCounter[addr] {
            return fmt.Errorf("unexpected counter %v vs %v", app.addressCounter[addr]+1, t.originalCache.addressCounter[addr])
        }
    }

    t.counter++
    t.ready = false
    return nil
}

func (t bdBlockDeliveredTester) StopTime() bool {
    return true
}

func (t *bdBlockDeliveredTester) Rollback() error {
    app := t.App.(*DexconApp)
    block := app.blockchain.CurrentBlock()
    app.blockchain.Rollback([]common.Hash{app.blockchain.CurrentBlock().Hash()})
    rawdb.DeleteCanonicalHash(t.App.(*DexconApp).chainDB, block.NumberU64())
    time.Sleep(100 * time.Millisecond)
    app.txPool.Reset(app.blockchain.CurrentBlock().Header())

    app.confirmedBlocks = t.originalCache.confirmedBlocks
    app.addressNonce = t.originalCache.addressNonce
    app.addressCost = t.originalCache.addressCost
    app.addressCounter = t.originalCache.addressCounter
    app.undeliveredNum++
    app.deliveredHeight--
    return nil
}

type TxFactory struct {
    FactoryBase

    keys []*ecdsa.PrivateKey

    sendInterval time.Duration

    nonce uint64
}

func (f *TxFactory) Run() {
    blockchain := f.App.(*DexconApp).blockchain
    txPool := f.App.(*DexconApp).txPool
    for {
        gasPrice := f.App.(*DexconApp).gov.GetHeadState().MinGasPrice()
        for i, key := range f.keys {
            go func(at int, nonce uint64, key *ecdsa.PrivateKey) {
                f.stopTimeMu.RLock()
                for i := 0; i < len(f.keys); i++ {
                    if i == at {
                        continue
                    }

                    tx := types.NewTransaction(
                        nonce,
                        crypto.PubkeyToAddress(f.keys[i].PublicKey),
                        big.NewInt(1),
                        21000,
                        gasPrice,
                        []byte{})

                    signer := types.NewEIP155Signer(blockchain.Config().ChainID)

                    tx, err := types.SignTx(tx, signer, key)
                    if err != nil {
                        panic(err)
                    }

                    err = txPool.AddLocal(tx)
                    if err != nil {
                        panic(err)
                    }
                    nonce++
                }
                f.stopTimeMu.RUnlock()
            }(i, f.nonce, key)
        }

        f.nonce += uint64(len(f.keys)) - 1

        time.Sleep(f.sendInterval)
    }
}

func (f TxFactory) New(app App, center *ProductCenter, stopTimeMu *sync.RWMutex, keys []*ecdsa.PrivateKey) *TxFactory {
    f.FactoryBase = FactoryBase{
        App:        app,
        name:       reflect.TypeOf(f).Name(),
        center:     center,
        stopTimeMu: stopTimeMu,
    }
    f.keys = keys
    f.sendInterval = 1000 * time.Millisecond
    return &f
}

func TestDexonApp(t *testing.T) {
    masterKey, err := crypto.GenerateKey()
    if err != nil {
        t.Fatalf("Generate key fail: %v", err)
    }

    dex, keys, err := newDexon(masterKey, 15)
    if err != nil {
        t.Fatalf("New dexon fail: %v", err)
    }

    stopTimeMu := &sync.RWMutex{}

    center := ProductCenter{}.New()
    configFactory := ConfigFactory{}.New(dex.app, center, stopTimeMu, masterKey)
    preparePayloadFactory := PreparePayloadFactory{}.NewWithTester(dex.app, center, stopTimeMu)
    prepareWitnessFactory := PrepareWitnessFactory{}.NewWithTester(dex.app, center, stopTimeMu)
    verifyBlockFactory := VerifyBlockFactory{}.NewWithTester(dex.app, center, masterKey, stopTimeMu)
    blockConfirmedFactory := BlockConfirmedFactory{}.NewWithTester(dex.app, center, stopTimeMu, masterKey)
    blockDeliveredFactory := BlockDeliveredFactory{}.NewWithTester(dex.app, center, stopTimeMu)
    txFactory := TxFactory{}.New(dex.app, center, stopTimeMu, keys)

    go configFactory.Run()
    go preparePayloadFactory.Run()
    go prepareWitnessFactory.Run()
    go verifyBlockFactory.Run()
    go blockConfirmedFactory.Run()
    go blockDeliveredFactory.Run()
    go txFactory.Run()

    timer := time.NewTimer(300 * time.Second)
    successRecord := make(map[string]struct{})
    for {
        select {
        case sig := <-preparePayloadFactory.status:
            if _, exist := sig[runSuccess]; exist {
                successRecord[reflect.TypeOf(*preparePayloadFactory).Name()] = struct{}{}
            } else if msg, exist := sig[runFail]; exist {
                t.Fatalf("preparePayloadFactory error: %v", msg)
            }
        case sig := <-prepareWitnessFactory.status:
            if _, exist := sig[runSuccess]; exist {
                successRecord[reflect.TypeOf(*prepareWitnessFactory).Name()] = struct{}{}
            } else if msg, exist := sig[runFail]; exist {
                t.Fatalf("prepareWitnessFactory error: %v", msg)
            }
        case sig := <-verifyBlockFactory.status:
            if _, exist := sig[runSuccess]; exist {
                successRecord[reflect.TypeOf(*verifyBlockFactory).Name()] = struct{}{}
            } else if msg, exist := sig[runFail]; exist {
                t.Fatalf("verifyBlockFactory error: %v", msg)
            }
        case sig := <-blockConfirmedFactory.status:
            if _, exist := sig[runSuccess]; exist {
                successRecord[reflect.TypeOf(*blockConfirmedFactory).Name()] = struct{}{}
            } else if msg, exist := sig[runFail]; exist {
                t.Fatalf("blockConfirmedFactory error: %v", msg)
            }
        case sig := <-blockDeliveredFactory.status:
            if _, exist := sig[runSuccess]; exist {
                successRecord[reflect.TypeOf(*blockDeliveredFactory).Name()] = struct{}{}
            } else if msg, exist := sig[runFail]; exist {
                t.Fatalf("blockDeliveredFactory error: %v", msg)
            }
        case <-timer.C:
            t.Fatalf("time's up and all test is not finish yet: %v", successRecord)
        }

        leftTesterCount := len(preparePayloadFactory.testers) + len(prepareWitnessFactory.testers) +
            len(verifyBlockFactory.testers) + len(blockConfirmedFactory.testers) + len(blockDeliveredFactory.testers)
        if leftTesterCount == 0 {
            t.Logf("tests all pass")
            break
        }

        time.Sleep(1 * time.Second)
    }
}

func newDexon(masterKey *ecdsa.PrivateKey, accountNum int) (*Dexon, []*ecdsa.PrivateKey, error) {
    db := ethdb.NewMemDatabase()

    genesis := core.DefaultTestnetGenesisBlock()
    genesis.Alloc[crypto.PubkeyToAddress(masterKey.PublicKey)] = core.GenesisAccount{
        Balance:   big.NewInt(100000000000000000),
        Staked:    big.NewInt(50000000000000000),
        PublicKey: crypto.FromECDSAPub(&masterKey.PublicKey),
    }

    var accounts []*ecdsa.PrivateKey
    for i := 0; i < accountNum; i++ {
        key, err := crypto.GenerateKey()
        if err != nil {
            panic(err)
        }

        genesis.Alloc[crypto.PubkeyToAddress(key.PublicKey)] = core.GenesisAccount{
            Balance: math.BigPow(10, 18),
            Staked:  big.NewInt(0),
        }
        accounts = append(accounts, key)
    }

    genesis.Config.Dexcon.BlockGasLimit = 2000000
    genesis.Config.Dexcon.RoundLength = 600
    genesis.Config.Dexcon.Owner = crypto.PubkeyToAddress(masterKey.PublicKey)

    chainConfig, _, err := core.SetupGenesisBlock(db, genesis)
    if err != nil {
        return nil, nil, err
    }

    config := Config{PrivateKey: masterKey}
    vmConfig := vm.Config{IsBlockProposer: true}

    engine := dexcon.New()

    dex := &Dexon{
        chainDb:     db,
        chainConfig: chainConfig,
        networkID:   config.NetworkId,
        engine:      engine,
    }

    dex.blockchain, err = core.NewBlockChain(db, nil, chainConfig, engine, vmConfig, nil)
    if err != nil {
        return nil, nil, err
    }

    txPoolConfig := core.DefaultTxPoolConfig
    dex.txPool = core.NewTxPool(txPoolConfig, chainConfig, dex.blockchain)

    dex.APIBackend = &DexAPIBackend{dex, nil}
    dex.governance = NewDexconGovernance(dex.APIBackend, dex.chainConfig, config.PrivateKey)
    engine.SetGovStateFetcher(dex.governance)
    dex.app = NewDexconApp(dex.txPool, dex.blockchain, dex.governance, db, &config)

    return dex, accounts, nil
}