fix: Simulation is not deterministic due to GenSignedMockTx (backport #…

…12374) (#12403)

CHANGELOG.md

@@ -48,6 +48,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (testutil/sims) [#12374](https://github.com/cosmos/cosmos-sdk/pull/12374) fix the non-determinstic behavior in simulations caused by `GenSignedMockTx` and check empty coins slice before it is used to create `banktype.MsgSend`.
 * [#12448](https://github.com/cosmos/cosmos-sdk/pull/12448) Start telemetry independently from the API server.
 * [#12509](https://github.com/cosmos/cosmos-sdk/pull/12509) Fix `Register{Tx,Tendermint}Service` not being called, resulting in some endpoints like the Simulate endpoint not working.
 

simapp/helpers/test_helpers.go

@@ -2,7 +2,6 @@ package helpers
 
 import (
 	"math/rand"
-	"time"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
@@ -19,15 +18,13 @@ const (
 )
 
 // GenSignedMockTx generates a signed mock transaction.
-func GenSignedMockTx(gen client.TxConfig, msgs []sdk.Msg, feeAmt sdk.Coins, gas uint64, chainID string, accNums, accSeqs []uint64, priv ...cryptotypes.PrivKey) (sdk.Tx, error) {
+func GenSignedMockTx(r *rand.Rand, txConfig client.TxConfig, msgs []sdk.Msg, feeAmt sdk.Coins, gas uint64, chainID string, accNums, accSeqs []uint64, priv ...cryptotypes.PrivKey) (sdk.Tx, error) {
 	sigs := make([]signing.SignatureV2, len(priv))
 
 	// create a random length memo
-	r := rand.New(rand.NewSource(time.Now().UnixNano()))
-
 	memo := simulation.RandStringOfLength(r, simulation.RandIntBetween(r, 0, 100))
 
-	signMode := gen.SignModeHandler().DefaultMode()
+	signMode := txConfig.SignModeHandler().DefaultMode()
 
 	// 1st round: set SignatureV2 with empty signatures, to set correct
 	// signer infos.
@@ -41,7 +38,7 @@ func GenSignedMockTx(gen client.TxConfig, msgs []sdk.Msg, feeAmt sdk.Coins, gas
 		}
 	}
 
-	tx := gen.NewTxBuilder()
+	tx := txConfig.NewTxBuilder()
 	err := tx.SetMsgs(msgs...)
 	if err != nil {
 		return nil, err
@@ -63,7 +60,7 @@ func GenSignedMockTx(gen client.TxConfig, msgs []sdk.Msg, feeAmt sdk.Coins, gas
 			Sequence:      accSeqs[i],
 			PubKey:        p.PubKey(),
 		}
-		signBytes, err := gen.SignModeHandler().GetSignBytes(signMode, signerData, tx.GetTx())
+		signBytes, err := txConfig.SignModeHandler().GetSignBytes(signMode, signerData, tx.GetTx())
 		if err != nil {
 			panic(err)
 		}

simapp/test_helpers.go

@@ -5,6 +5,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"math/rand"
 	"strconv"
 	"testing"
 	"time"
@@ -412,6 +413,7 @@ func SignCheckDeliver(
 	chainID string, accNums, accSeqs []uint64, expSimPass, expPass bool, priv ...cryptotypes.PrivKey,
 ) (sdk.GasInfo, *sdk.Result, error) {
 	tx, err := helpers.GenSignedMockTx(
+		rand.New(rand.NewSource(time.Now().UnixNano())),
 		txCfg,
 		msgs,
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
@@ -462,6 +464,7 @@ func GenSequenceOfTxs(txGen client.TxConfig, msgs []sdk.Msg, accNums []uint64, i
 	var err error
 	for i := 0; i < numToGenerate; i++ {
 		txs[i], err = helpers.GenSignedMockTx(
+			rand.New(rand.NewSource(time.Now().UnixNano())),
 			txGen,
 			msgs,
 			sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},

x/authz/simulation/operations.go

@@ -116,8 +116,10 @@ func SimulateMsgGrant(ak authz.AccountKeeper, bk authz.BankKeeper, _ keeper.Keep
 		if err != nil {
 			return simtypes.NoOpMsg(authz.ModuleName, TypeMsgGrant, err.Error()), nil, err
 		}
+
 		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txCfg,
 			[]sdk.Msg{msg},
 			fees,
@@ -188,6 +190,7 @@ func SimulateMsgRevoke(ak authz.AccountKeeper, bk authz.BankKeeper, k keeper.Kee
 		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		account := ak.GetAccount(ctx, granterAddr)
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txCfg,
 			[]sdk.Msg{&msg},
 			fees,
@@ -250,6 +253,10 @@ func SimulateMsgExec(ak authz.AccountKeeper, bk authz.BankKeeper, k keeper.Keepe
 
 		granterspendableCoins := bk.SpendableCoins(ctx, granterAddr)
 		coins := simtypes.RandSubsetCoins(r, granterspendableCoins)
+		// if coins slice is empty, we can not create valid banktype.MsgSend
+		if len(coins) == 0 {
+			return simtypes.NoOpMsg(authz.ModuleName, TypeMsgExec, "empty coins slice"), nil, nil
+		}
 
 		// Check send_enabled status of each sent coin denom
 		if err := bk.IsSendEnabledCoins(ctx, coins...); err != nil {
@@ -277,6 +284,7 @@ func SimulateMsgExec(ak authz.AccountKeeper, bk authz.BankKeeper, k keeper.Keepe
 		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		granteeAcc := ak.GetAccount(ctx, granteeAddr)
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txCfg,
 			[]sdk.Msg{&msgExec},
 			fees,

x/bank/simulation/operations.go

@@ -60,6 +60,11 @@ func SimulateMsgSend(ak types.AccountKeeper, bk keeper.Keeper) simtypes.Operatio
 	) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
 		from, to, coins, skip := randomSendFields(r, ctx, accs, bk, ak)
 
+		// if coins slice is empty, we can not create valid types.MsgSend
+		if len(coins) == 0 {
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgSend, "empty coins slice"), nil, nil
+		}
+
 		// Check send_enabled status of each coin denom
 		if err := bk.IsSendEnabledCoins(ctx, coins...); err != nil {
 			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgSend, err.Error()), nil, nil
@@ -93,6 +98,10 @@ func SimulateMsgSendToModuleAccount(ak types.AccountKeeper, bk keeper.Keeper, mo
 
 		spendable := bk.SpendableCoins(ctx, from.Address)
 		coins := simtypes.RandSubsetCoins(r, spendable)
+		// if coins slice is empty, we can not create valid types.MsgSend
+		if len(coins) == 0 {
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgSend, "empty coins slice"), nil, nil
+		}
 
 		// Check send_enabled status of each coin denom
 		if err := bk.IsSendEnabledCoins(ctx, coins...); err != nil {
@@ -137,6 +146,7 @@ func sendMsgSend(
 	}
 	txGen := simappparams.MakeTestEncodingConfig().TxConfig
 	tx, err := helpers.GenSignedMockTx(
+		r,
 		txGen,
 		[]sdk.Msg{msg},
 		fees,
@@ -350,6 +360,7 @@ func sendMsgMultiSend(
 
 	txGen := simappparams.MakeTestEncodingConfig().TxConfig
 	tx, err := helpers.GenSignedMockTx(
+		r,
 		txGen,
 		[]sdk.Msg{msg},
 		fees,

x/distribution/simulation/operations.go

@@ -229,6 +229,7 @@ func SimulateMsgFundCommunityPool(ak types.AccountKeeper, bk types.BankKeeper, k
 		msg := types.NewMsgFundCommunityPool(fundAmount, funder.Address)
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,

x/genutil/gentx_test.go

@@ -3,7 +3,9 @@ package genutil_test
 import (
 	"encoding/json"
 	"fmt"
+	"math/rand"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/suite"
 	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
@@ -231,8 +233,10 @@ func (suite *GenTxTestSuite) TestDeliverGenTxs() {
 				_ = suite.setAccountBalance(addr1, 50)
 				_ = suite.setAccountBalance(addr2, 1)
 
+				r := rand.New(rand.NewSource(time.Now().UnixNano()))
 				msg := banktypes.NewMsgSend(addr1, addr2, sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 1)})
 				tx, err := helpers.GenSignedMockTx(
+					r,
 					suite.encodingConfig.TxConfig,
 					[]sdk.Msg{msg},
 					sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 10)},

x/gov/simulation/operations.go

@@ -170,6 +170,7 @@ func SimulateMsgSubmitProposal(
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -256,6 +257,7 @@ func SimulateMsgDeposit(ak types.AccountKeeper, bk types.BankKeeper, k keeper.Ke
 		}
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,

x/group/simulation/operations.go

@@ -261,6 +261,7 @@ func SimulateMsgCreateGroup(ak group.AccountKeeper, bk group.BankKeeper) simtype
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -320,6 +321,7 @@ func SimulateMsgCreateGroupWithPolicy(ak group.AccountKeeper, bk group.BankKeepe
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -379,6 +381,7 @@ func SimulateMsgCreateGroupPolicy(ak group.AccountKeeper, bk group.BankKeeper, k
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -454,6 +457,7 @@ func SimulateMsgSubmitProposal(ak group.AccountKeeper, bk group.BankKeeper, k ke
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -513,6 +517,7 @@ func SimulateMsgUpdateGroupAdmin(ak group.AccountKeeper, bk group.BankKeeper, k
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -563,6 +568,7 @@ func SimulateMsgUpdateGroupMetadata(ak group.AccountKeeper, bk group.BankKeeper,
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -642,6 +648,7 @@ func SimulateMsgUpdateGroupMembers(ak group.AccountKeeper,
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -701,6 +708,7 @@ func SimulateMsgUpdateGroupPolicyAdmin(ak group.AccountKeeper, bk group.BankKeep
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -762,6 +770,7 @@ func SimulateMsgUpdateGroupPolicyDecisionPolicy(ak group.AccountKeeper,
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -813,6 +822,7 @@ func SimulateMsgUpdateGroupPolicyMetadata(ak group.AccountKeeper,
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -915,6 +925,7 @@ func SimulateMsgWithdrawProposal(ak group.AccountKeeper,
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -1020,6 +1031,7 @@ func SimulateMsgVote(ak group.AccountKeeper,
 		}
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -1098,6 +1110,7 @@ func SimulateMsgExec(ak group.AccountKeeper,
 		}
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -1160,6 +1173,7 @@ func SimulateMsgLeaveGroup(k keeper.Keeper, ak group.AccountKeeper, bk group.Ban
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,

x/nft/simulation/operations.go

@@ -97,6 +97,7 @@ func SimulateMsgSend(
 
 		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
+			r,
 			txCfg,
 			[]sdk.Msg{msg},
 			fees,

x/simulation/util.go

@@ -101,6 +101,7 @@ func GenAndDeliverTxWithRandFees(txCtx OperationInput) (simtypes.OperationMsg, [
 func GenAndDeliverTx(txCtx OperationInput, fees sdk.Coins) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
 	account := txCtx.AccountKeeper.GetAccount(txCtx.Context, txCtx.SimAccount.Address)
 	tx, err := helpers.GenSignedMockTx(
+		txCtx.R,
 		txCtx.TxGen,
 		[]sdk.Msg{txCtx.Msg},
 		fees,

x/slashing/simulation/operations.go

@@ -86,9 +86,10 @@ func SimulateMsgUnjail(ak types.AccountKeeper, bk types.BankKeeper, k keeper.Kee
 
 		msg := types.NewMsgUnjail(validator.GetOperator())
 
-		txGen := simappparams.MakeTestEncodingConfig().TxConfig
+		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenSignedMockTx(
-			txGen,
+			r,
+			txCfg,
 			[]sdk.Msg{msg},
 			fees,
 			helpers.DefaultGenTxGas,
@@ -101,7 +102,7 @@ func SimulateMsgUnjail(ak types.AccountKeeper, bk types.BankKeeper, k keeper.Kee
 			return simtypes.NoOpMsg(types.ModuleName, msg.Type(), "unable to generate mock tx"), nil, err
 		}
 
-		_, res, err := app.SimDeliver(txGen.TxEncoder(), tx)
+		_, res, err := app.SimDeliver(txCfg.TxEncoder(), tx)
 
 		// result should fail if:
 		// - validator cannot be unjailed due to tombstone

x/staking/simulation/operations.go

@@ -164,6 +164,7 @@ func SimulateMsgCreateValidator(ak types.AccountKeeper, bk types.BankKeeper, k k
 		}
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,
@@ -288,6 +289,7 @@ func SimulateMsgDelegate(ak types.AccountKeeper, bk types.BankKeeper, k keeper.K
 		msg := types.NewMsgDelegate(simAccount.Address, val.GetOperator(), bondAmt)
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,