0g-chain/x/swap/simulation/operations.go

549 lines
21 KiB
Go
Raw Normal View History

Squash merge swap-acceptance branch (#956) * add failing acceptance test for a user depositing into a pool * implement GetAccount test helper * implement swap.MsgDeposit for creating and adding liquidity to a pool * update aliases, add event types, and fix typo/compiler errors in handler test * use only aliases names in handler test (don't use swap types -- ensures we have run aliasgen), add assertion for even type message * implement account and module account balance checks in handler test * fill out handler assertions for testing keeper state and events * update signed json representation and register swap/MsgDeposit for proper encoding * fill out boilerplate to get handler test to compile * alias gen for pool * add handling of message type; fill in deposit keeper method for succesful compile; noop but test assertions now run up to module acc not nil check * add module account permissions for swap module -- fixes module account creation; pass account keeper and supply keeper into swap keeper to allow the ability to work with user and module accounts * implement create pool logic for msg deposit; allows creation of a of new pool, checking params to see if it is allowed. Initi shares are set, and senders number of shares are stored * Swap migrations scaffolding (#925) * swap module scaffolding * global swap fee * can't think of a reason for begin blocker; removing for abci.go for now; * test pair types; refactor pair name logic; simplify pairs validation and fix stack overflow error * check comparison * use test package * init swap module genesis * add basic marshall tests * remove reward apy from pairs * fix integration helpers * use max swap fee constant; fix validation of swap fee; add tests to cover param validation and param set setup * use noerror over nil * start genesis tests * test param set validation mirrors param validation * add genesis tests * remove print statement * add subtests for genesis test cases; add extra querier test for unknown route; add keeper params testing * add spec * update swagger * find replace hard -> swap in comments * remove unused method * rename pairs to allowed pools; pool is more commonly used, and allowedPool makes it more clear what swap parameter is for. In addition, we won't conflict with Pool data structure for storing a created pool in the store. * remove generated link * missed spec rename * validate token order for allowed pools * fix swagger * json should be snakecase; change allowedPools to allowed_pools * add legacy types * add swap genesis to v0_15 migration * add legacy types * add swap genesis to v0_15 migration * migration revisions Co-authored-by: Nick DeLuca <nickdeluca08@gmail.com> * keeper todos * update keeper tests * type todos * update types tests * tx deposit cli cmd * tx deposit rest * Swap module simulation scaffolding (#924) * sims scaffolding * add noop operation * genesis revisions * add param changes * mvoe persistance methods to main keeper file, consolidate tests * make helper methods private. they are tested via deposit method, and unit testing them would make test suite brittle and refactoring difficult * use more clear coin variables * code 1 is reserved, use code 2 and sequence all errors * remove todo * Implement deadline for swap module module message. This is implemented in handler with a interface to easily apply to it to all messages, and separate msg validation concerns from the keeper * move allowed pools to params -- let pool and pool_test focus on pool domain logic, not parameter & governance concerns * update alias * add unitless implementatin of constant product liquidity pool to isolate and enapsulate liquidity logic. Swap methods interfaces are added, but implementation not yet added * nits and todos * add ErrInvalidPool * add tests for edge cases around pool depletion; add explicit panic for edge case that results in a pool reserve being zero; handle pool reinitialization if it is empty * touch up comments and flush out the rest of assertions * add data structures for keeper state storage separate from pool domain objects, and improve structure for easier querying * rename pool name to pool key for events * add support for a denominated pool that uses sdk.Coins and sdk.Coin arguments, keeping tracking of the units in the base pool. This gives nice separation between pool logic, and coin/denom logic * refactor keeper to use new records for storage, and implement pool deposit using the denominated pool * address previous PR comment - reminder for migration if changing account permissions * msg deposit should validate that denoms are not equal * add godoc comments * golint and some poolName -> poolID cleanup * implement adding liquidity to an existing pool * hardcode pools in sims * touch up comment * withdraw keeper logic * withdraw type updates * add withdraw msg tx handler * initial withdraw test * fix panic * use new denominated pool with existing shares * fix: check args on deposit cmd * add slippage limit check for depositing to an existing pool * send coins just before event emission * check liquidity returned is greater than zero for both coins; ensure returned number of shares are greater than zero * add deadline to msgwithdraw * register msgwithdraw * scaffold msgwithdraw types test * register the correct msg * modify swap functions to also return the amount paid for the pool swap fee. This will be used to calculate slippage and for event tracking * add slippage types * add expected withdrawal coins * calculate slippage against expected coins * update withdraw keeper tests * spelling, improve comments on add liquidity math * typo * typo * grammer * typo / grammer * remove pool_id from withdraw msg * add slippage to tx cmd * TestWithdraw_Partial * nit * add withdraw no pool, no deposit record tests * drop event check on partial withdraw test * fix broken link * fix broken link * resolve merge conflicts * ensure swap fee can not be equal to 1; add full implementation of swap pool methods; these implementation ensure that the pool invariant is always greater or equal to the previous invariant * refactor duplicated code into private swap methods * add runtime assertion to always ensure invariant is greater or equal to the previous invariant sub fee on swaps * improve comments for base pool swap functions * add swap exact input and output methods to denominated pool that wrap the base pool interface for swapping * comment touch ups * more comment touchups * fix msg deposit struct tag (#943) * use better name for swap calculation private methods * nits: golint * fix misspelling in method name * Add HARD token governance committee for Hard module (#941) * add hard gov token committee * revisions: update migration * revisions: update test/data file * initial revisions * add TokenCommittee JSONMarshal test * fix SetPermissions method * remove BaseCommittee Type field * add incentive params to allowed params * Add SWP token governance committee for Swap module (#946) * add swp token commitee to migration * update test, add gen export utility method * final revisions: add TODO * remove slippage from withdraw to use min values for coins; add additional validation test cases * update alias for swap module * add withdraw tests to handler for increased coverage; note: first pass, improvements still yet to be made here * refact withdraw keeper to use min amounts; panic for cases that do not happen in normal situations * lint fixes * use total shares to track if pool should be deleted; add more in depth withdraw comment * add exact args for withdraw cmd * extract record update methods * update depositor share record if it exists -- do not overwrite an existing record; ensures no loss of shares if the same address deposits more than once * Swap queries: deposit, pool, pools (#949) * query deposits types * implement deposit querier keeper methods * query deposits CLI * query deposits REST * query types for pool/pools * pool/pools querier keeper methods * pool/pools CLI * pool/pools REST * basic pool/pools query tests * basic deposit querier test * iterate share records via owner bytes * nit: add example for querying deposits by owner only Co-authored-by: karzak <kjydavis3@gmail.com> * feat: add REST tx handler for swap LP withdrawals Co-authored-by: Nick DeLuca <nickdeluca08@gmail.com> Co-authored-by: Denali Marsh <denali@kava.io> Co-authored-by: denalimarsh <denalimarsh@gmail.com> Co-authored-by: karzak <kjydavis3@gmail.com>
2021-07-13 11:38:15 +00:00
package simulation
// import (
// "errors"
// "fmt"
// "math/big"
// "math/rand"
// "time"
// "github.com/cosmos/cosmos-sdk/baseapp"
// "github.com/cosmos/cosmos-sdk/codec"
// "github.com/cosmos/cosmos-sdk/simapp/helpers"
// sdk "github.com/cosmos/cosmos-sdk/types"
// authexported "github.com/cosmos/cosmos-sdk/x/auth/exported"
// "github.com/cosmos/cosmos-sdk/x/simulation"
// appparams "github.com/kava-labs/kava/app/params"
// "github.com/kava-labs/kava/x/swap/keeper"
// "github.com/kava-labs/kava/x/swap/types"
// )
// var (
// //nolint
// noOpMsg = simulation.NoOpMsg(types.ModuleName)
// errorNotEnoughCoins = errors.New("account doesn't have enough coins")
// )
// // Simulation operation weights constants
// const (
// OpWeightMsgDeposit = "op_weight_msg_deposit"
// OpWeightMsgWithdraw = "op_weight_msg_withdraw"
// OpWeightMsgSwapExactForTokens = "op_weight_msg_swap_exact_for_tokens"
// OpWeightMsgSwapForExactTokens = "op_weight_msg_swap_for_exact_tokens"
// )
// // WeightedOperations returns all the operations from the module with their respective weights
// func WeightedOperations(
// appParams simulation.AppParams, cdc *codec.Codec, ak types.AccountKeeper, k keeper.Keeper,
// ) simulation.WeightedOperations {
// var weightMsgDeposit int
// var weightMsgWithdraw int
// var weightMsgSwapExactForTokens int
// var weightMsgSwapForExactTokens int
// appParams.GetOrGenerate(cdc, OpWeightMsgDeposit, &weightMsgDeposit, nil,
// func(_ *rand.Rand) {
// weightMsgDeposit = appparams.DefaultWeightMsgDeposit
// },
// )
// appParams.GetOrGenerate(cdc, OpWeightMsgWithdraw, &weightMsgWithdraw, nil,
// func(_ *rand.Rand) {
// weightMsgWithdraw = appparams.DefaultWeightMsgWithdraw
// },
// )
// appParams.GetOrGenerate(cdc, OpWeightMsgSwapExactForTokens, &weightMsgSwapExactForTokens, nil,
// func(_ *rand.Rand) {
// weightMsgSwapExactForTokens = appparams.DefaultWeightMsgSwapExactForTokens
// },
// )
// appParams.GetOrGenerate(cdc, OpWeightMsgSwapForExactTokens, &weightMsgSwapForExactTokens, nil,
// func(_ *rand.Rand) {
// weightMsgSwapForExactTokens = appparams.DefaultWeightMsgSwapForExactTokens
// },
// )
// return simulation.WeightedOperations{
// simulation.NewWeightedOperation(
// weightMsgDeposit,
// SimulateMsgDeposit(ak, k),
// ),
// simulation.NewWeightedOperation(
// weightMsgWithdraw,
// SimulateMsgWithdraw(ak, k),
// ),
// simulation.NewWeightedOperation(
// weightMsgSwapExactForTokens,
// SimulateMsgSwapExactForTokens(ak, k),
// ),
// simulation.NewWeightedOperation(
// weightMsgSwapForExactTokens,
// SimulateMsgSwapForExactTokens(ak, k),
// ),
// }
// }
// // SimulateMsgDeposit generates a MsgDeposit
// func SimulateMsgDeposit(ak types.AccountKeeper, k keeper.Keeper) simulation.Operation {
// return func(
// r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
// ) (simulation.OperationMsg, []simulation.FutureOperation, error) {
// // Get possible pools and shuffle so that deposits are evenly distributed across pools
// params := k.GetParams(ctx)
// allowedPools := params.AllowedPools
// r.Shuffle(len(allowedPools), func(i, j int) {
// allowedPools[i], allowedPools[j] = allowedPools[j], allowedPools[i]
// })
// // Find an account-pool pair that is likely to result in a successful deposit
// blockTime := ctx.BlockHeader().Time
// depositor, allowedPool, found := findValidAccountAllowedPoolPair(accs, allowedPools, func(acc simulation.Account, pool types.AllowedPool) bool {
// account := ak.GetAccount(ctx, acc.Address)
// err := validateDepositor(ctx, k, pool, account, blockTime)
// if err == errorNotEnoughCoins {
// return false // keep searching
// } else if err != nil {
// panic(err) // raise errors
// }
// return true // found valid pair
// })
// if !found {
// return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (no valid allowed pool and depositor)", "", false, nil), nil, nil
// }
// // Get random slippage amount between 1-99%
// slippageRaw, err := RandIntInclusive(r, sdk.OneInt(), sdk.NewInt(99))
// if err != nil {
// panic(err)
// }
// slippage := slippageRaw.ToDec().Quo(sdk.NewDec(100))
// // Generate random deadline
// deadline := genRandDeadline(r, blockTime)
// depositorAcc := ak.GetAccount(ctx, depositor.Address)
// depositorCoins := depositorAcc.SpendableCoins(blockTime)
// // Construct initial msg (without coin amounts)
// msg := types.NewMsgDeposit(depositorAcc.GetAddress(), sdk.Coin{}, sdk.Coin{}, slippage, deadline)
// // Populate msg with randomized token amounts
// pool, found := k.GetPool(ctx, allowedPool.Name())
// if !found { // Pool doesn't exist: first deposit
// depositTokenA := randCoinFromCoins(r, depositorCoins, allowedPool.TokenA)
// msg.TokenA = depositTokenA
// depositTokenB := randCoinFromCoins(r, depositorCoins, allowedPool.TokenB)
// msg.TokenB = depositTokenB
// } else { // Pool exists: successive deposit
// var denomX string // Denom X is the token denom in the pool with the larger amount
// var denomY string // Denom Y is the token denom in the pool with the larger amount
// if pool.ReservesA.Amount.GTE(pool.ReservesB.Amount) {
// denomX = pool.ReservesA.Denom
// denomY = pool.ReservesB.Denom
// } else {
// denomX = pool.ReservesB.Denom
// denomY = pool.ReservesA.Denom
// }
// depositTokenY := randCoinFromCoins(r, depositorCoins, denomY)
// msg.TokenA = depositTokenY
// // Calculate the pool's slippage ratio and use it to build other coin
// ratio := pool.Reserves().AmountOf(denomX).ToDec().Quo(pool.Reserves().AmountOf(denomY).ToDec())
// amtTokenX := depositTokenY.Amount.ToDec().Mul(ratio).RoundInt()
// depositTokenX := sdk.NewCoin(denomX, amtTokenX)
// if depositorCoins.AmountOf(denomX).LT(amtTokenX) {
// return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (depositor has insufficient coins)", "", false, nil), nil, nil
// }
// msg.TokenB = depositTokenX
// }
// err = msg.ValidateBasic()
// if err != nil {
// return noOpMsg, nil, nil
// }
// tx := helpers.GenTx(
// []sdk.Msg{msg},
// sdk.NewCoins(),
// helpers.DefaultGenTxGas,
// chainID,
// []uint64{depositorAcc.GetAccountNumber()},
// []uint64{depositorAcc.GetSequence()},
// depositor.PrivKey,
// )
// _, result, err := app.Deliver(tx)
// if err != nil {
// // to aid debugging, add the stack trace to the comment field of the returned opMsg
// return simulation.NewOperationMsg(msg, false, fmt.Sprintf("%+v", err)), nil, err
// }
// return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
// }
// }
// // SimulateMsgWithdraw generates a MsgWithdraw
// func SimulateMsgWithdraw(ak types.AccountKeeper, k keeper.Keeper) simulation.Operation {
// return func(
// r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
// ) (simulation.OperationMsg, []simulation.FutureOperation, error) {
// poolRecords := k.GetAllPools(ctx)
// r.Shuffle(len(poolRecords), func(i, j int) {
// poolRecords[i], poolRecords[j] = poolRecords[j], poolRecords[i]
// })
// // Find an account-pool pair for which withdraw is possible
// withdrawer, poolRecord, found := findValidAccountPoolRecordPair(accs, poolRecords, func(acc simulation.Account, poolRecord types.PoolRecord) bool {
// _, found := k.GetDepositorShares(ctx, acc.Address, poolRecord.PoolID)
// return found
// })
// if !found {
// return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (no valid pool record and withdrawer)", "", false, nil), nil, nil
// }
// withdrawerAcc := ak.GetAccount(ctx, withdrawer.Address)
// shareRecord, _ := k.GetDepositorShares(ctx, withdrawerAcc.GetAddress(), poolRecord.PoolID)
// denominatedPool, err := types.NewDenominatedPoolWithExistingShares(poolRecord.Reserves(), poolRecord.TotalShares)
// if err != nil {
// return noOpMsg, nil, nil
// }
// coinsOwned := denominatedPool.ShareValue(shareRecord.SharesOwned)
// // Get random amount of shares between 2-10% of the total
// sharePercentage, err := RandIntInclusive(r, sdk.NewInt(2), sdk.NewInt(10))
// if err != nil {
// panic(err)
// }
// shares := shareRecord.SharesOwned.Mul(sharePercentage).Quo(sdk.NewInt(100))
// // Expect minimum token amounts relative to the % of shares owned and withdrawn
// oneLessThanSharePercentage := sharePercentage.Sub(sdk.OneInt())
// amtTokenAOwned := coinsOwned.AmountOf(poolRecord.ReservesA.Denom)
// minAmtTokenA := amtTokenAOwned.Mul(oneLessThanSharePercentage).Quo(sdk.NewInt(100))
// minTokenA := sdk.NewCoin(poolRecord.ReservesA.Denom, minAmtTokenA)
// amtTokenBOwned := coinsOwned.AmountOf(poolRecord.ReservesB.Denom)
// minTokenAmtB := amtTokenBOwned.Mul(oneLessThanSharePercentage).Quo(sdk.NewInt(100))
// minTokenB := sdk.NewCoin(poolRecord.ReservesB.Denom, minTokenAmtB)
// // Generate random deadline
// blockTime := ctx.BlockHeader().Time
// deadline := genRandDeadline(r, blockTime)
// // Construct MsgWithdraw
// msg := types.NewMsgWithdraw(withdrawerAcc.GetAddress(), shares, minTokenA, minTokenB, deadline)
// err = msg.ValidateBasic()
// if err != nil {
// return noOpMsg, nil, nil
// }
// tx := helpers.GenTx(
// []sdk.Msg{msg},
// sdk.NewCoins(),
// helpers.DefaultGenTxGas,
// chainID,
// []uint64{withdrawerAcc.GetAccountNumber()},
// []uint64{withdrawerAcc.GetSequence()},
// withdrawer.PrivKey,
// )
// _, result, err := app.Deliver(tx)
// if err != nil {
// // to aid debugging, add the stack trace to the comment field of the returned opMsg
// return simulation.NewOperationMsg(msg, false, fmt.Sprintf("%+v", err)), nil, err
// }
// return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
// }
// }
// // SimulateMsgSwapExactForTokens generates a MsgSwapExactForTokens
// func SimulateMsgSwapExactForTokens(ak types.AccountKeeper, k keeper.Keeper) simulation.Operation {
// return func(
// r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
// ) (simulation.OperationMsg, []simulation.FutureOperation, error) {
// poolRecords := k.GetAllPools(ctx)
// r.Shuffle(len(poolRecords), func(i, j int) {
// poolRecords[i], poolRecords[j] = poolRecords[j], poolRecords[i]
// })
// // Find an account-pool pair for which trade is possible
// trader, poolRecord, found := findValidAccountPoolRecordPair(accs, poolRecords, func(acc simulation.Account, poolRecord types.PoolRecord) bool {
// traderAcc := ak.GetAccount(ctx, acc.Address)
// balanceTokenA := traderAcc.GetCoins().AmountOf(poolRecord.ReservesA.Denom)
// balanceTokenB := traderAcc.GetCoins().AmountOf(poolRecord.ReservesB.Denom)
// if !balanceTokenA.IsPositive() || !balanceTokenB.IsPositive() {
// return false
// }
// return true
// })
// if !found {
// return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (no valid pool record and trader)", "", false, nil), nil, nil
// }
// // Select input token
// randInt, err := RandInt(r, sdk.OneInt(), sdk.NewInt(9))
// if err != nil {
// panic(err)
// }
// inputToken := poolRecord.ReservesA
// outputToken := poolRecord.ReservesB
// if randInt.Int64()%2 == 0 {
// inputToken = poolRecord.ReservesB
// outputToken = poolRecord.ReservesA
// }
// // Select entity (trader account or pool) with smaller token amount
// traderAcc := ak.GetAccount(ctx, trader.Address)
// maxTradeAmount := inputToken.Amount
// if traderAcc.GetCoins().AmountOf(inputToken.Denom).LT(inputToken.Amount) {
// maxTradeAmount = traderAcc.GetCoins().AmountOf(inputToken.Denom)
// }
// // Exact input token is between 2-10% of the max trade amount
// percentage, err := RandIntInclusive(r, sdk.NewInt(2), sdk.NewInt(10))
// if err != nil {
// panic(err)
// }
// tradeAmount := maxTradeAmount.Mul(percentage).Quo(sdk.NewInt(100))
// exactInputToken := sdk.NewCoin(inputToken.Denom, tradeAmount)
// // Calculate expected output coin
// globalSwapFee := k.GetSwapFee(ctx)
// tradeAmountAfterFee := exactInputToken.Amount.ToDec().Mul(sdk.OneDec().Sub(globalSwapFee)).TruncateInt()
// var outputAmt big.Int
// outputAmt.Mul(outputToken.Amount.BigInt(), tradeAmountAfterFee.BigInt())
// outputAmt.Quo(&outputAmt, inputToken.Amount.Add(tradeAmountAfterFee).BigInt())
// expectedOutTokenAmount := sdk.NewIntFromBigInt(&outputAmt)
// expectedOutputToken := sdk.NewCoin(outputToken.Denom, expectedOutTokenAmount)
// // Get random slippage amount between 50-100%
// slippageRaw, err := RandIntInclusive(r, sdk.NewInt(50), sdk.NewInt(99))
// if err != nil {
// panic(err)
// }
// slippage := slippageRaw.ToDec().Quo(sdk.NewDec(100))
// // Generate random deadline
// blockTime := ctx.BlockHeader().Time
// deadline := genRandDeadline(r, blockTime)
// // Construct MsgSwapExactForTokens
// msg := types.NewMsgSwapExactForTokens(traderAcc.GetAddress(), exactInputToken, expectedOutputToken, slippage, deadline)
// err = msg.ValidateBasic()
// if err != nil {
// return noOpMsg, nil, nil
// }
// tx := helpers.GenTx(
// []sdk.Msg{msg},
// sdk.NewCoins(),
// helpers.DefaultGenTxGas,
// chainID,
// []uint64{traderAcc.GetAccountNumber()},
// []uint64{traderAcc.GetSequence()},
// trader.PrivKey,
// )
// _, result, err := app.Deliver(tx)
// if err != nil {
// // to aid debugging, add the stack trace to the comment field of the returned opMsg
// return simulation.NewOperationMsg(msg, false, fmt.Sprintf("%+v", err)), nil, err
// }
// return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
// }
// }
// // SimulateMsgSwapForExactTokens generates a MsgSwapForExactTokens
// func SimulateMsgSwapForExactTokens(ak types.AccountKeeper, k keeper.Keeper) simulation.Operation {
// return func(
// r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
// ) (simulation.OperationMsg, []simulation.FutureOperation, error) {
// poolRecords := k.GetAllPools(ctx)
// r.Shuffle(len(poolRecords), func(i, j int) {
// poolRecords[i], poolRecords[j] = poolRecords[j], poolRecords[i]
// })
// // Find an account-pool pair for which trade is possible
// trader, poolRecord, found := findValidAccountPoolRecordPair(accs, poolRecords, func(acc simulation.Account, poolRecord types.PoolRecord) bool {
// traderAcc := ak.GetAccount(ctx, acc.Address)
// balanceTokenA := traderAcc.GetCoins().AmountOf(poolRecord.ReservesA.Denom)
// balanceTokenB := traderAcc.GetCoins().AmountOf(poolRecord.ReservesB.Denom)
// if !balanceTokenA.IsPositive() || !balanceTokenB.IsPositive() {
// return false
// }
// return true
// })
// if !found {
// return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (no valid pool record and trader)", "", false, nil), nil, nil
// }
// // Select input token
// randInt, err := RandInt(r, sdk.OneInt(), sdk.NewInt(9))
// if err != nil {
// panic(err)
// }
// inputToken := poolRecord.ReservesA
// outputToken := poolRecord.ReservesB
// if randInt.Int64()%2 == 0 {
// inputToken = poolRecord.ReservesB
// outputToken = poolRecord.ReservesA
// }
// // Select entity (trader account or pool) with smaller token amount
// traderAcc := ak.GetAccount(ctx, trader.Address)
// maxTradeAmount := inputToken.Amount
// if traderAcc.GetCoins().AmountOf(inputToken.Denom).LT(inputToken.Amount) {
// maxTradeAmount = traderAcc.GetCoins().AmountOf(inputToken.Denom)
// }
// // Expected input token is between 2-10% of the max trade amount
// percentage, err := RandIntInclusive(r, sdk.NewInt(2), sdk.NewInt(10))
// if err != nil {
// panic(err)
// }
// tradeAmount := maxTradeAmount.Mul(percentage).Quo(sdk.NewInt(100))
// expectedInputToken := sdk.NewCoin(inputToken.Denom, tradeAmount)
// // Calculate exact output coin
// globalSwapFee := k.GetSwapFee(ctx)
// tradeAmountAfterFee := expectedInputToken.Amount.ToDec().Mul(sdk.OneDec().Sub(globalSwapFee)).TruncateInt()
// var outputAmt big.Int
// outputAmt.Mul(outputToken.Amount.BigInt(), tradeAmountAfterFee.BigInt())
// outputAmt.Quo(&outputAmt, inputToken.Amount.Add(tradeAmountAfterFee).BigInt())
// outputTokenAmount := sdk.NewIntFromBigInt(&outputAmt)
// exactOutputToken := sdk.NewCoin(outputToken.Denom, outputTokenAmount)
// // Get random slippage amount between 50-100%
// slippageRaw, err := RandIntInclusive(r, sdk.NewInt(50), sdk.NewInt(99))
// if err != nil {
// panic(err)
// }
// slippage := slippageRaw.ToDec().Quo(sdk.NewDec(100))
// // Generate random deadline
// blockTime := ctx.BlockHeader().Time
// deadline := genRandDeadline(r, blockTime)
// // Construct MsgSwapForExactTokens
// msg := types.NewMsgSwapForExactTokens(traderAcc.GetAddress(), expectedInputToken, exactOutputToken, slippage, deadline)
// err = msg.ValidateBasic()
// if err != nil {
// return noOpMsg, nil, nil
// }
// tx := helpers.GenTx(
// []sdk.Msg{msg},
// sdk.NewCoins(),
// helpers.DefaultGenTxGas,
// chainID,
// []uint64{traderAcc.GetAccountNumber()},
// []uint64{traderAcc.GetSequence()},
// trader.PrivKey,
// )
// _, result, err := app.Deliver(tx)
// if err != nil {
// // to aid debugging, add the stack trace to the comment field of the returned opMsg
// return simulation.NewOperationMsg(msg, false, fmt.Sprintf("%+v", err)), nil, err
// }
// return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
// }
// }
// // From a set of coins return a coin of the specified denom with 1-10% of the total amount
// func randCoinFromCoins(r *rand.Rand, coins sdk.Coins, denom string) sdk.Coin {
// percentOfBalance, err := RandIntInclusive(r, sdk.OneInt(), sdk.NewInt(10))
// if err != nil {
// panic(err)
// }
// balance := coins.AmountOf(denom)
// amtToken := balance.Mul(percentOfBalance).Quo(sdk.NewInt(100))
// return sdk.NewCoin(denom, amtToken)
// }
// func validateDepositor(ctx sdk.Context, k keeper.Keeper, allowedPool types.AllowedPool,
// depositor authexported.Account, blockTime time.Time) error {
// depositorCoins := depositor.SpendableCoins(blockTime)
// tokenABalance := depositorCoins.AmountOf(allowedPool.TokenA)
// tokenBBalance := depositorCoins.AmountOf(allowedPool.TokenB)
// oneThousand := sdk.NewInt(1000)
// if tokenABalance.LT(oneThousand) || tokenBBalance.LT(oneThousand) {
// return errorNotEnoughCoins
// }
// return nil
// }
// // findValidAccountAllowedPoolPair finds an account for which the callback func returns true
// func findValidAccountAllowedPoolPair(accounts []simulation.Account, pools types.AllowedPools,
// cb func(simulation.Account, types.AllowedPool) bool) (simulation.Account, types.AllowedPool, bool) {
// for _, pool := range pools {
// for _, acc := range accounts {
// if isValid := cb(acc, pool); isValid {
// return acc, pool, true
// }
// }
// }
// return simulation.Account{}, types.AllowedPool{}, false
// }
// // findValidAccountPoolRecordPair finds an account for which the callback func returns true
// func findValidAccountPoolRecordPair(accounts []simulation.Account, pools types.PoolRecords,
// cb func(simulation.Account, types.PoolRecord) bool) (simulation.Account, types.PoolRecord, bool) {
// for _, pool := range pools {
// for _, acc := range accounts {
// if isValid := cb(acc, pool); isValid {
// return acc, pool, true
// }
// }
// }
// return simulation.Account{}, types.PoolRecord{}, false
// }
// func genRandDeadline(r *rand.Rand, blockTime time.Time) int64 {
// // Set up deadline
// durationNanoseconds, err := RandIntInclusive(r,
// sdk.NewInt((time.Second * 10).Nanoseconds()), // ten seconds
// sdk.NewInt((time.Hour * 24).Nanoseconds()), // one day
// )
// if err != nil {
// panic(err)
// }
// extraTime := time.Duration(durationNanoseconds.Int64())
// return blockTime.Add(extraTime).Unix()
// }
// // RandIntInclusive randomly generates an sdk.Int in the range [inclusiveMin, inclusiveMax]. It works for negative and positive integers.
// func RandIntInclusive(r *rand.Rand, inclusiveMin, inclusiveMax sdk.Int) (sdk.Int, error) {
// if inclusiveMin.GT(inclusiveMax) {
// return sdk.Int{}, fmt.Errorf("min larger than max")
// }
// return RandInt(r, inclusiveMin, inclusiveMax.Add(sdk.OneInt()))
// }
// // RandInt randomly generates an sdk.Int in the range [inclusiveMin, exclusiveMax). It works for negative and positive integers.
// func RandInt(r *rand.Rand, inclusiveMin, exclusiveMax sdk.Int) (sdk.Int, error) {
// // validate input
// if inclusiveMin.GTE(exclusiveMax) {
// return sdk.Int{}, fmt.Errorf("min larger or equal to max")
// }
// // shift the range to start at 0
// shiftedRange := exclusiveMax.Sub(inclusiveMin) // should always be positive given the check above
// // randomly pick from the shifted range
// shiftedRandInt := sdk.NewIntFromBigInt(new(big.Int).Rand(r, shiftedRange.BigInt()))
// // shift back to the original range
// return shiftedRandInt.Add(inclusiveMin), nil
// }