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package v0
import (
"context"
"crypto/rand"
"encoding/binary"
"fmt"
mrand "math/rand"
"os"
"testing"
"time"
"github.com/gogo/protobuf/proto"
gogotypes "github.com/gogo/protobuf/types"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/mock"
"github.com/stretchr/testify/require"
abciclient "github.com/tendermint/tendermint/abci/client"
abciclimocks "github.com/tendermint/tendermint/abci/client/mocks"
"github.com/tendermint/tendermint/abci/example/kvstore"
abciserver "github.com/tendermint/tendermint/abci/server"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/tendermint/tendermint/config"
"github.com/tendermint/tendermint/internal/mempool"
"github.com/tendermint/tendermint/libs/log"
tmrand "github.com/tendermint/tendermint/libs/rand"
"github.com/tendermint/tendermint/libs/service"
"github.com/tendermint/tendermint/types"
)
// A cleanupFunc cleans up any config / test files created for a particular
// test.
type cleanupFunc func()
func newMempoolWithApp(cc abciclient.Creator) (*CListMempool, cleanupFunc) {
return newMempoolWithAppAndConfig(cc, config.ResetTestRoot("mempool_test"))
}
func newMempoolWithAppAndConfig(cc abciclient.Creator, cfg *config.Config) (*CListMempool, cleanupFunc) {
appConnMem, _ := cc()
appConnMem.SetLogger(log.TestingLogger().With("module", "abci-client", "connection", "mempool"))
err := appConnMem.Start()
if err != nil {
panic(err)
}
mp := NewCListMempool(cfg.Mempool, appConnMem, 0)
mp.SetLogger(log.TestingLogger())
return mp, func() { os.RemoveAll(cfg.RootDir) }
}
func ensureNoFire(t *testing.T, ch <-chan struct{}, timeoutMS int) {
timer := time.NewTimer(time.Duration(timeoutMS) * time.Millisecond)
select {
case <-ch:
t.Fatal("Expected not to fire")
case <-timer.C:
}
}
func ensureFire(t *testing.T, ch <-chan struct{}, timeoutMS int) {
timer := time.NewTimer(time.Duration(timeoutMS) * time.Millisecond)
select {
case <-ch:
case <-timer.C:
t.Fatal("Expected to fire")
}
}
func checkTxs(t *testing.T, mp mempool.Mempool, count int, peerID uint16) types.Txs {
txs := make(types.Txs, count)
txInfo := mempool.TxInfo{SenderID: peerID}
for i := 0; i < count; i++ {
txBytes := make([]byte, 20)
txs[i] = txBytes
_, err := rand.Read(txBytes)
if err != nil {
t.Error(err)
}
if err := mp.CheckTx(context.Background(), txBytes, nil, txInfo); err != nil {
// Skip invalid txs.
// TestMempoolFilters will fail otherwise. It asserts a number of txs
// returned.
if types.IsPreCheckError(err) {
continue
}
t.Fatalf("CheckTx failed: %v while checking #%d tx", err, i)
}
}
return txs
}
func TestReapMaxBytesMaxGas(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
mp, cleanup := newMempoolWithApp(cc)
defer cleanup()
// Ensure gas calculation behaves as expected
checkTxs(t, mp, 1, mempool.UnknownPeerID)
tx0 := mp.TxsFront().Value.(*mempoolTx)
// assert that kv store has gas wanted = 1.
require.Equal(t, app.CheckTx(abci.RequestCheckTx{Tx: tx0.tx}).GasWanted, int64(1), "KVStore had a gas value neq to 1")
require.Equal(t, tx0.gasWanted, int64(1), "transactions gas was set incorrectly")
// ensure each tx is 20 bytes long
require.Equal(t, len(tx0.tx), 20, "Tx is longer than 20 bytes")
mp.Flush()
// each table driven test creates numTxsToCreate txs with checkTx, and at the end clears all remaining txs.
// each tx has 20 bytes
tests := []struct {
numTxsToCreate int
maxBytes int64
maxGas int64
expectedNumTxs int
}{
{20, -1, -1, 20},
{20, -1, 0, 0},
{20, -1, 10, 10},
{20, -1, 30, 20},
{20, 0, -1, 0},
{20, 0, 10, 0},
{20, 10, 10, 0},
{20, 24, 10, 1},
{20, 240, 5, 5},
{20, 240, -1, 10},
{20, 240, 10, 10},
{20, 240, 15, 10},
{20, 20000, -1, 20},
{20, 20000, 5, 5},
{20, 20000, 30, 20},
}
for tcIndex, tt := range tests {
checkTxs(t, mp, tt.numTxsToCreate, mempool.UnknownPeerID)
got := mp.ReapMaxBytesMaxGas(tt.maxBytes, tt.maxGas)
assert.Equal(t, tt.expectedNumTxs, len(got), "Got %d txs, expected %d, tc #%d",
len(got), tt.expectedNumTxs, tcIndex)
mp.Flush()
}
}
func TestMempoolFilters(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
mp, cleanup := newMempoolWithApp(cc)
defer cleanup()
emptyTxArr := []types.Tx{[]byte{}}
nopPreFilter := func(tx types.Tx) error { return nil }
nopPostFilter := func(tx types.Tx, res *abci.ResponseCheckTx) error { return nil }
// each table driven test creates numTxsToCreate txs with checkTx, and at the end clears all remaining txs.
// each tx has 20 bytes
tests := []struct {
numTxsToCreate int
preFilter mempool.PreCheckFunc
postFilter mempool.PostCheckFunc
expectedNumTxs int
}{
{10, nopPreFilter, nopPostFilter, 10},
{10, mempool.PreCheckMaxBytes(10), nopPostFilter, 0},
{10, mempool.PreCheckMaxBytes(22), nopPostFilter, 10},
{10, nopPreFilter, mempool.PostCheckMaxGas(-1), 10},
{10, nopPreFilter, mempool.PostCheckMaxGas(0), 0},
{10, nopPreFilter, mempool.PostCheckMaxGas(1), 10},
{10, nopPreFilter, mempool.PostCheckMaxGas(3000), 10},
{10, mempool.PreCheckMaxBytes(10), mempool.PostCheckMaxGas(20), 0},
{10, mempool.PreCheckMaxBytes(30), mempool.PostCheckMaxGas(20), 10},
{10, mempool.PreCheckMaxBytes(22), mempool.PostCheckMaxGas(1), 10},
{10, mempool.PreCheckMaxBytes(22), mempool.PostCheckMaxGas(0), 0},
}
for tcIndex, tt := range tests {
err := mp.Update(1, emptyTxArr, abciResponses(len(emptyTxArr), abci.CodeTypeOK), tt.preFilter, tt.postFilter)
require.NoError(t, err)
checkTxs(t, mp, tt.numTxsToCreate, mempool.UnknownPeerID)
require.Equal(t, tt.expectedNumTxs, mp.Size(), "mempool had the incorrect size, on test case %d", tcIndex)
mp.Flush()
}
}
func TestMempoolUpdate(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
mp, cleanup := newMempoolWithApp(cc)
defer cleanup()
// 1. Adds valid txs to the cache
{
err := mp.Update(1, []types.Tx{[]byte{0x01}}, abciResponses(1, abci.CodeTypeOK), nil, nil)
require.NoError(t, err)
err = mp.CheckTx(context.Background(), []byte{0x01}, nil, mempool.TxInfo{})
require.NoError(t, err)
}
// 2. Removes valid txs from the mempool
{
err := mp.CheckTx(context.Background(), []byte{0x02}, nil, mempool.TxInfo{})
require.NoError(t, err)
err = mp.Update(1, []types.Tx{[]byte{0x02}}, abciResponses(1, abci.CodeTypeOK), nil, nil)
require.NoError(t, err)
assert.Zero(t, mp.Size())
}
// 3. Removes invalid transactions from the cache and the mempool (if present)
{
err := mp.CheckTx(context.Background(), []byte{0x03}, nil, mempool.TxInfo{})
require.NoError(t, err)
err = mp.Update(1, []types.Tx{[]byte{0x03}}, abciResponses(1, 1), nil, nil)
require.NoError(t, err)
assert.Zero(t, mp.Size())
err = mp.CheckTx(context.Background(), []byte{0x03}, nil, mempool.TxInfo{})
require.NoError(t, err)
}
}
func TestMempoolUpdateDoesNotPanicWhenApplicationMissedTx(t *testing.T) {
var callback abciclient.Callback
mockClient := new(abciclimocks.Client)
mockClient.On("Start").Return(nil)
mockClient.On("SetLogger", mock.Anything)
mockClient.On("Error").Return(nil).Times(4)
mockClient.On("FlushAsync", mock.Anything).Return(abciclient.NewReqRes(abci.ToRequestFlush()), nil)
mockClient.On("SetResponseCallback", mock.MatchedBy(func(cb abciclient.Callback) bool { callback = cb; return true }))
cc := func() (abciclient.Client, error) {
return mockClient, nil
}
mp, cleanup := newMempoolWithApp(cc)
defer cleanup()
// Add 4 transactions to the mempool by calling the mempool's `CheckTx` on each of them.
txs := []types.Tx{[]byte{0x01}, []byte{0x02}, []byte{0x03}, []byte{0x04}}
for _, tx := range txs {
reqRes := abciclient.NewReqRes(abci.ToRequestCheckTx(abci.RequestCheckTx{Tx: tx}))
reqRes.Response = abci.ToResponseCheckTx(abci.ResponseCheckTx{Code: abci.CodeTypeOK})
// SetDone allows the ReqRes to process its callback synchronously.
// This simulates the Response being ready for the client immediately.
reqRes.SetDone()
mockClient.On("CheckTxAsync", mock.Anything, mock.Anything).Return(reqRes, nil)
err := mp.CheckTx(context.Background(), tx, nil, mempool.TxInfo{})
require.NoError(t, err)
}
// Calling update to remove the first transaction from the mempool.
// This call also triggers the mempool to recheck its remaining transactions.
err := mp.Update(0, []types.Tx{txs[0]}, abciResponses(1, abci.CodeTypeOK), nil, nil)
require.Nil(t, err)
// The mempool has now sent its requests off to the client to be rechecked
// and is waiting for the corresponding callbacks to be called.
// We now call the mempool-supplied callback on the first and third transaction.
// This simulates the client dropping the second request.
// Previous versions of this code panicked when the ABCI application missed
// a recheck-tx request.
resp := abci.ResponseCheckTx{Code: abci.CodeTypeOK}
req := abci.RequestCheckTx{Tx: txs[1]}
callback(abci.ToRequestCheckTx(req), abci.ToResponseCheckTx(resp))
req = abci.RequestCheckTx{Tx: txs[3]}
callback(abci.ToRequestCheckTx(req), abci.ToResponseCheckTx(resp))
mockClient.AssertExpectations(t)
}
func TestMempool_KeepInvalidTxsInCache(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
wcfg := config.DefaultConfig()
wcfg.Mempool.KeepInvalidTxsInCache = true
mp, cleanup := newMempoolWithAppAndConfig(cc, wcfg)
defer cleanup()
// 1. An invalid transaction must remain in the cache after Update
{
a := make([]byte, 8)
binary.BigEndian.PutUint64(a, 0)
b := make([]byte, 8)
binary.BigEndian.PutUint64(b, 1)
err := mp.CheckTx(context.Background(), b, nil, mempool.TxInfo{})
require.NoError(t, err)
// simulate new block
_ = app.DeliverTx(abci.RequestDeliverTx{Tx: a})
_ = app.DeliverTx(abci.RequestDeliverTx{Tx: b})
err = mp.Update(1, []types.Tx{a, b},
[]*abci.ResponseDeliverTx{{Code: abci.CodeTypeOK}, {Code: 2}}, nil, nil)
require.NoError(t, err)
// a must be added to the cache
err = mp.CheckTx(context.Background(), a, nil, mempool.TxInfo{})
require.NoError(t, err)
// b must remain in the cache
err = mp.CheckTx(context.Background(), b, nil, mempool.TxInfo{})
require.NoError(t, err)
}
// 2. An invalid transaction must remain in the cache
{
a := make([]byte, 8)
binary.BigEndian.PutUint64(a, 0)
// remove a from the cache to test (2)
mp.cache.Remove(a)
err := mp.CheckTx(context.Background(), a, nil, mempool.TxInfo{})
require.NoError(t, err)
}
}
func TestTxsAvailable(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
mp, cleanup := newMempoolWithApp(cc)
defer cleanup()
mp.EnableTxsAvailable()
timeoutMS := 500
// with no txs, it shouldnt fire
ensureNoFire(t, mp.TxsAvailable(), timeoutMS)
// send a bunch of txs, it should only fire once
txs := checkTxs(t, mp, 100, mempool.UnknownPeerID)
ensureFire(t, mp.TxsAvailable(), timeoutMS)
ensureNoFire(t, mp.TxsAvailable(), timeoutMS)
// call update with half the txs.
// it should fire once now for the new height
// since there are still txs left
committedTxs, txs := txs[:50], txs[50:]
if err := mp.Update(1, committedTxs, abciResponses(len(committedTxs), abci.CodeTypeOK), nil, nil); err != nil {
t.Error(err)
}
ensureFire(t, mp.TxsAvailable(), timeoutMS)
ensureNoFire(t, mp.TxsAvailable(), timeoutMS)
// send a bunch more txs. we already fired for this height so it shouldnt fire again
moreTxs := checkTxs(t, mp, 50, mempool.UnknownPeerID)
ensureNoFire(t, mp.TxsAvailable(), timeoutMS)
// now call update with all the txs. it should not fire as there are no txs left
committedTxs = append(txs, moreTxs...) //nolint: gocritic
if err := mp.Update(2, committedTxs, abciResponses(len(committedTxs), abci.CodeTypeOK), nil, nil); err != nil {
t.Error(err)
}
ensureNoFire(t, mp.TxsAvailable(), timeoutMS)
// send a bunch more txs, it should only fire once
checkTxs(t, mp, 100, mempool.UnknownPeerID)
ensureFire(t, mp.TxsAvailable(), timeoutMS)
ensureNoFire(t, mp.TxsAvailable(), timeoutMS)
}
func TestSerialReap(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
mp, cleanup := newMempoolWithApp(cc)
defer cleanup()
appConnCon, _ := cc()
appConnCon.SetLogger(log.TestingLogger().With("module", "abci-client", "connection", "consensus"))
err := appConnCon.Start()
require.Nil(t, err)
cacheMap := make(map[string]struct{})
deliverTxsRange := func(start, end int) {
// Deliver some txs.
for i := start; i < end; i++ {
// This will succeed
txBytes := make([]byte, 8)
binary.BigEndian.PutUint64(txBytes, uint64(i))
err := mp.CheckTx(context.Background(), txBytes, nil, mempool.TxInfo{})
_, cached := cacheMap[string(txBytes)]
if cached {
require.NotNil(t, err, "expected error for cached tx")
} else {
require.Nil(t, err, "expected no err for uncached tx")
}
cacheMap[string(txBytes)] = struct{}{}
// Duplicates are cached and should return error
err = mp.CheckTx(context.Background(), txBytes, nil, mempool.TxInfo{})
require.NotNil(t, err, "Expected error after CheckTx on duplicated tx")
}
}
reapCheck := func(exp int) {
txs := mp.ReapMaxBytesMaxGas(-1, -1)
require.Equal(t, len(txs), exp, fmt.Sprintf("Expected to reap %v txs but got %v", exp, len(txs)))
}
updateRange := func(start, end int) {
txs := make([]types.Tx, 0)
for i := start; i < end; i++ {
txBytes := make([]byte, 8)
binary.BigEndian.PutUint64(txBytes, uint64(i))
txs = append(txs, txBytes)
}
if err := mp.Update(0, txs, abciResponses(len(txs), abci.CodeTypeOK), nil, nil); err != nil {
t.Error(err)
}
}
commitRange := func(start, end int) {
ctx := context.Background()
// Deliver some txs.
for i := start; i < end; i++ {
txBytes := make([]byte, 8)
binary.BigEndian.PutUint64(txBytes, uint64(i))
res, err := appConnCon.DeliverTxSync(ctx, abci.RequestDeliverTx{Tx: txBytes})
if err != nil {
t.Errorf("client error committing tx: %v", err)
}
if res.IsErr() {
t.Errorf("error committing tx. Code:%v result:%X log:%v",
res.Code, res.Data, res.Log)
}
}
res, err := appConnCon.CommitSync(ctx)
if err != nil {
t.Errorf("client error committing: %v", err)
}
if len(res.Data) != 8 {
t.Errorf("error committing. Hash:%X", res.Data)
}
}
//----------------------------------------
// Deliver some txs.
deliverTxsRange(0, 100)
// Reap the txs.
reapCheck(100)
// Reap again. We should get the same amount
reapCheck(100)
// Deliver 0 to 999, we should reap 900 new txs
// because 100 were already counted.
deliverTxsRange(0, 1000)
// Reap the txs.
reapCheck(1000)
// Reap again. We should get the same amount
reapCheck(1000)
// Commit from the conensus AppConn
commitRange(0, 500)
updateRange(0, 500)
// We should have 500 left.
reapCheck(500)
// Deliver 100 invalid txs and 100 valid txs
deliverTxsRange(900, 1100)
// We should have 600 now.
reapCheck(600)
}
func TestMempool_CheckTxChecksTxSize(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
mempl, cleanup := newMempoolWithApp(cc)
defer cleanup()
maxTxSize := mempl.config.MaxTxBytes
testCases := []struct {
len int
err bool
}{
// check small txs. no error
0: {10, false},
1: {1000, false},
2: {1000000, false},
// check around maxTxSize
3: {maxTxSize - 1, false},
4: {maxTxSize, false},
5: {maxTxSize + 1, true},
}
for i, testCase := range testCases {
caseString := fmt.Sprintf("case %d, len %d", i, testCase.len)
tx := tmrand.Bytes(testCase.len)
err := mempl.CheckTx(context.Background(), tx, nil, mempool.TxInfo{})
bv := gogotypes.BytesValue{Value: tx}
bz, err2 := bv.Marshal()
require.NoError(t, err2)
require.Equal(t, len(bz), proto.Size(&bv), caseString)
if !testCase.err {
require.NoError(t, err, caseString)
} else {
require.Equal(t, err, types.ErrTxTooLarge{
Max: maxTxSize,
Actual: testCase.len,
}, caseString)
}
}
}
func TestMempoolTxsBytes(t *testing.T) {
app := kvstore.NewApplication()
cc := abciclient.NewLocalCreator(app)
cfg := config.ResetTestRoot("mempool_test")
cfg.Mempool.MaxTxsBytes = 10
mp, cleanup := newMempoolWithAppAndConfig(cc, cfg)
defer cleanup()
// 1. zero by default
assert.EqualValues(t, 0, mp.SizeBytes())
// 2. len(tx) after CheckTx
err := mp.CheckTx(context.Background(), []byte{0x01}, nil, mempool.TxInfo{})
require.NoError(t, err)
assert.EqualValues(t, 1, mp.SizeBytes())
// 3. zero again after tx is removed by Update
err = mp.Update(1, []types.Tx{[]byte{0x01}}, abciResponses(1, abci.CodeTypeOK), nil, nil)
require.NoError(t, err)
assert.EqualValues(t, 0, mp.SizeBytes())
// 4. zero after Flush
err = mp.CheckTx(context.Background(), []byte{0x02, 0x03}, nil, mempool.TxInfo{})
require.NoError(t, err)
assert.EqualValues(t, 2, mp.SizeBytes())
mp.Flush()
assert.EqualValues(t, 0, mp.SizeBytes())
// 5. ErrMempoolIsFull is returned when/if MaxTxsBytes limit is reached.
err = mp.CheckTx(
context.Background(),
[]byte{0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04},
nil,
mempool.TxInfo{},
)
require.NoError(t, err)
err = mp.CheckTx(context.Background(), []byte{0x05}, nil, mempool.TxInfo{})
if assert.Error(t, err) {
assert.IsType(t, types.ErrMempoolIsFull{}, err)
}
// 6. zero after tx is rechecked and removed due to not being valid anymore
app2 := kvstore.NewApplication()
cc = abciclient.NewLocalCreator(app2)
mp, cleanup = newMempoolWithApp(cc)
defer cleanup()
txBytes := make([]byte, 8)
binary.BigEndian.PutUint64(txBytes, uint64(0))
err = mp.CheckTx(context.Background(), txBytes, nil, mempool.TxInfo{})
require.NoError(t, err)
assert.EqualValues(t, 8, mp.SizeBytes())
appConnCon, _ := cc()
appConnCon.SetLogger(log.TestingLogger().With("module", "abci-client", "connection", "consensus"))
err = appConnCon.Start()
require.Nil(t, err)
t.Cleanup(func() {
if err := appConnCon.Stop(); err != nil {
t.Error(err)
}
})
ctx := context.Background()
res, err := appConnCon.DeliverTxSync(ctx, abci.RequestDeliverTx{Tx: txBytes})
require.NoError(t, err)
require.EqualValues(t, 0, res.Code)
res2, err := appConnCon.CommitSync(ctx)
require.NoError(t, err)
require.NotEmpty(t, res2.Data)
// Pretend like we committed nothing so txBytes gets rechecked and removed.
err = mp.Update(1, []types.Tx{}, abciResponses(0, abci.CodeTypeOK), nil, nil)
require.NoError(t, err)
assert.EqualValues(t, 8, mp.SizeBytes())
// 7. Test RemoveTxByKey function
err = mp.CheckTx(context.Background(), []byte{0x06}, nil, mempool.TxInfo{})
require.NoError(t, err)
assert.EqualValues(t, 9, mp.SizeBytes())
assert.Error(t, mp.RemoveTxByKey(types.Tx([]byte{0x07}).Key()))
assert.EqualValues(t, 9, mp.SizeBytes())
assert.NoError(t, mp.RemoveTxByKey(types.Tx([]byte{0x06}).Key()))
assert.EqualValues(t, 8, mp.SizeBytes())
}
// This will non-deterministically catch some concurrency failures like
// https://github.com/tendermint/tendermint/issues/3509
// TODO: all of the tests should probably also run using the remote proxy app
// since otherwise we're not actually testing the concurrency of the mempool here!
func TestMempoolRemoteAppConcurrency(t *testing.T) {
sockPath := fmt.Sprintf("unix:///tmp/echo_%v.sock", tmrand.Str(6))
app := kvstore.NewApplication()
cc, server := newRemoteApp(t, sockPath, app)
t.Cleanup(func() {
if err := server.Stop(); err != nil {
t.Error(err)
}
})
cfg := config.ResetTestRoot("mempool_test")
mp, cleanup := newMempoolWithAppAndConfig(cc, cfg)
defer cleanup()
// generate small number of txs
nTxs := 10
txLen := 200
txs := make([]types.Tx, nTxs)
for i := 0; i < nTxs; i++ {
txs[i] = tmrand.Bytes(txLen)
}
// simulate a group of peers sending them over and over
N := cfg.Mempool.Size
maxPeers := 5
for i := 0; i < N; i++ {
peerID := mrand.Intn(maxPeers)
txNum := mrand.Intn(nTxs)
tx := txs[txNum]
// this will err with ErrTxInCache many times ...
mp.CheckTx(context.Background(), tx, nil, mempool.TxInfo{SenderID: uint16(peerID)}) //nolint: errcheck // will error
}
err := mp.FlushAppConn()
require.NoError(t, err)
}
// caller must close server
func newRemoteApp(
t *testing.T,
addr string,
app abci.Application,
) (
clientCreator abciclient.Creator,
server service.Service,
) {
clientCreator = abciclient.NewRemoteCreator(addr, "socket", true)
// Start server
server = abciserver.NewSocketServer(addr, app)
server.SetLogger(log.TestingLogger().With("module", "abci-server"))
if err := server.Start(); err != nil {
t.Fatalf("Error starting socket server: %v", err.Error())
}
return clientCreator, server
}
func abciResponses(n int, code uint32) []*abci.ResponseDeliverTx {
responses := make([]*abci.ResponseDeliverTx, 0, n)
for i := 0; i < n; i++ {
responses = append(responses, &abci.ResponseDeliverTx{Code: code})
}
return responses
}