fix: Simulation is not deterministic due to GenSignedMockTx

CHANGELOG.md

@@ -77,6 +77,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/crisis) [#12208](https://github.com/cosmos/cosmos-sdk/pull/12208) Fix progress index of crisis invariant assertion logs.
 * (types) [#12229](https://github.com/cosmos/cosmos-sdk/pull/12229) Increase sdk.Dec maxApproxRootIterations to 300
 * (x/staking) [#12303](https://github.com/cosmos/cosmos-sdk/pull/12303) Use bytes instead of string comparison in delete validator queue
+* (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`.
 
 ## [v0.46.0-rc1](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.46.0-rc1) - 2022-05-23
 

simapp/test_helpers.go

@@ -3,7 +3,9 @@ package simapp
 import (
 	"context"
 	"encoding/json"
+	"math/rand"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 	abci "github.com/tendermint/tendermint/abci/types"
@@ -257,6 +259,7 @@ func SignCheckDeliver(
 	chainID string, accNums, accSeqs []uint64, expSimPass, expPass bool, priv ...cryptotypes.PrivKey,
 ) (sdk.GasInfo, *sdk.Result, error) {
 	tx, err := simtestutil.GenSignedMockTx(
+		rand.New(rand.NewSource(time.Now().UnixNano())),
 		txCfg,
 		msgs,
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
@@ -307,6 +310,7 @@ func GenSequenceOfTxs(txGen client.TxConfig, msgs []sdk.Msg, accNums []uint64, i
 	var err error
 	for i := 0; i < numToGenerate; i++ {
 		txs[i], err = simtestutil.GenSignedMockTx(
+			rand.New(rand.NewSource(time.Now().UnixNano())),
 			txGen,
 			msgs,
 			sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},

testutil/sims/tx_helpers.go

@@ -2,7 +2,6 @@ package sims
 
 import (
 	"math/rand"
-	"time"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
@@ -13,12 +12,10 @@ import (
 )
 
 // GenSignedMockTx generates a signed mock transaction.
-func GenSignedMockTx(txConfig 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 := txConfig.SignModeHandler().DefaultMode()

x/authz/simulation/operations.go

@@ -124,6 +124,7 @@ func SimulateMsgGrant(cdc *codec.ProtoCodec, ak authz.AccountKeeper, bk authz.Ba
 		}
 		txCfg := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txCfg,
 			[]sdk.Msg{msg},
 			fees,
@@ -194,6 +195,7 @@ func SimulateMsgRevoke(cdc *codec.ProtoCodec, ak authz.AccountKeeper, bk authz.B
 		txCfg := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		account := ak.GetAccount(ctx, granterAddr)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txCfg,
 			[]sdk.Msg{&msg},
 			fees,
@@ -256,6 +258,10 @@ func SimulateMsgExec(cdc *codec.ProtoCodec, ak authz.AccountKeeper, bk authz.Ban
 
 		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 {
@@ -283,6 +289,7 @@ func SimulateMsgExec(cdc *codec.ProtoCodec, ak authz.AccountKeeper, bk authz.Ban
 		txCfg := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		granteeAcc := ak.GetAccount(ctx, granteeAddr)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txCfg,
 			[]sdk.Msg{&msgExec},
 			fees,

x/bank/simulation/operations.go

@@ -61,6 +61,11 @@ 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
@@ -94,6 +99,10 @@ 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 {
@@ -138,6 +147,7 @@ func sendMsgSend(
 	}
 	txGen := simappparams.MakeTestEncodingConfig().TxConfig
 	tx, err := simtestutil.GenSignedMockTx(
+		r,
 		txGen,
 		[]sdk.Msg{msg},
 		fees,
@@ -351,6 +361,7 @@ func sendMsgMultiSend(
 
 	txGen := simappparams.MakeTestEncodingConfig().TxConfig
 	tx, err := simtestutil.GenSignedMockTx(
+		r,
 		txGen,
 		[]sdk.Msg{msg},
 		fees,

x/distribution/simulation/operations.go

@@ -236,6 +236,7 @@ func SimulateMsgFundCommunityPool(txConfig client.TxConfig, ak types.AccountKeep
 		msg := types.NewMsgFundCommunityPool(fundAmount, funder.Address)
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         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 := simtestutil.GenSignedMockTx(
+					r,
 					suite.encodingConfig.TxConfig,
 					[]sdk.Msg{msg},
 					sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 10)},

x/gov/simulation/operations.go

@@ -171,6 +171,7 @@ func SimulateMsgSubmitProposal(
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -257,6 +258,7 @@ 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

@@ -263,6 +263,7 @@ func SimulateMsgCreateGroup(cdc *codec.ProtoCodec, ak group.AccountKeeper, bk gr
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -322,6 +323,7 @@ func SimulateMsgCreateGroupWithPolicy(cdc *codec.ProtoCodec, ak group.AccountKee
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -381,6 +383,7 @@ func SimulateMsgCreateGroupPolicy(cdc *codec.ProtoCodec, ak group.AccountKeeper,
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -456,6 +459,7 @@ func SimulateMsgSubmitProposal(cdc *codec.ProtoCodec, ak group.AccountKeeper, bk
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -515,6 +519,7 @@ func SimulateMsgUpdateGroupAdmin(cdc *codec.ProtoCodec, ak group.AccountKeeper,
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -565,6 +570,7 @@ func SimulateMsgUpdateGroupMetadata(cdc *codec.ProtoCodec, ak group.AccountKeepe
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -644,6 +650,7 @@ func SimulateMsgUpdateGroupMembers(cdc *codec.ProtoCodec, ak group.AccountKeeper
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -703,6 +710,7 @@ func SimulateMsgUpdateGroupPolicyAdmin(cdc *codec.ProtoCodec, ak group.AccountKe
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -764,6 +772,7 @@ func SimulateMsgUpdateGroupPolicyDecisionPolicy(cdc *codec.ProtoCodec, ak group.
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -815,6 +824,7 @@ func SimulateMsgUpdateGroupPolicyMetadata(cdc *codec.ProtoCodec, ak group.Accoun
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -917,6 +927,7 @@ func SimulateMsgWithdrawProposal(cdc *codec.ProtoCodec, ak group.AccountKeeper,
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -1022,6 +1033,7 @@ func SimulateMsgVote(cdc *codec.ProtoCodec, ak group.AccountKeeper,
 		}
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -1100,6 +1112,7 @@ func SimulateMsgExec(cdc *codec.ProtoCodec, ak group.AccountKeeper,
 		}
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{&msg},
 			fees,
@@ -1162,6 +1175,7 @@ func SimulateMsgLeaveGroup(cdc *codec.ProtoCodec, k keeper.Keeper, ak group.Acco
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,

x/nft/simulation/operations.go

@@ -97,6 +97,7 @@ func SimulateMsgSend(
 
 		txCfg := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.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 := simtestutil.GenSignedMockTx(
+		txCtx.R,
 		txCtx.TxGen,
 		[]sdk.Msg{txCtx.Msg},
 		fees,

x/slashing/simulation/operations.go

@@ -91,6 +91,7 @@ func SimulateMsgUnjail(cdc *codec.ProtoCodec, ak types.AccountKeeper, bk types.B
 
 		txGen := tx.NewTxConfig(cdc, tx.DefaultSignModes)
 		tx, err := simtestutil.GenSignedMockTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,

x/staking/simulation/operations.go

@@ -165,6 +165,7 @@ func SimulateMsgCreateValidator(ak types.AccountKeeper, bk types.BankKeeper, k *
 		}
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,
@@ -289,6 +290,7 @@ func SimulateMsgDelegate(ak types.AccountKeeper, bk types.BankKeeper, k *keeper.
 		msg := types.NewMsgDelegate(simAccount.Address, val.GetOperator(), bondAmt)
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,