mirror of
https://github.com/0glabs/0g-chain.git
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252 lines
9.3 KiB
Go
252 lines
9.3 KiB
Go
package simulation
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import (
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"errors"
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"fmt"
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"math/big"
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"math/rand"
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"time"
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"github.com/cosmos/cosmos-sdk/baseapp"
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"github.com/cosmos/cosmos-sdk/codec"
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"github.com/cosmos/cosmos-sdk/simapp/helpers"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/auth"
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authexported "github.com/cosmos/cosmos-sdk/x/auth/exported"
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"github.com/cosmos/cosmos-sdk/x/simulation"
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appparams "github.com/kava-labs/kava/app/params"
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"github.com/kava-labs/kava/x/auction/keeper"
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"github.com/kava-labs/kava/x/auction/types"
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)
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var (
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errorNotEnoughCoins = errors.New("account doesn't have enough coins")
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errorCantReceiveBids = errors.New("auction can't receive bids (lot = 0 in reverse auction)")
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)
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// Simulation operation weights constants
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const (
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OpWeightMsgPlaceBid = "op_weight_msg_place_bid"
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)
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// WeightedOperations returns all the operations from the module with their respective weights
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func WeightedOperations(
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appParams simulation.AppParams, cdc *codec.Codec, ak auth.AccountKeeper, k keeper.Keeper,
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) simulation.WeightedOperations {
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var weightMsgPlaceBid int
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appParams.GetOrGenerate(cdc, OpWeightMsgPlaceBid, &weightMsgPlaceBid, nil,
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func(_ *rand.Rand) {
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weightMsgPlaceBid = appparams.DefaultWeightMsgPlaceBid
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},
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)
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return simulation.WeightedOperations{
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simulation.NewWeightedOperation(
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weightMsgPlaceBid,
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SimulateMsgPlaceBid(ak, k),
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),
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}
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}
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// SimulateMsgPlaceBid returns a function that runs a random state change on the module keeper.
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// There's two error paths
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// - return a OpMessage, but nil error - this will log a message but keep running the simulation
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// - return an error - this will stop the simulation
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func SimulateMsgPlaceBid(ak auth.AccountKeeper, keeper keeper.Keeper) simulation.Operation {
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return func(
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r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
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) (simulation.OperationMsg, []simulation.FutureOperation, error) {
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// get open auctions
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openAuctions := types.Auctions{}
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keeper.IterateAuctions(ctx, func(a types.Auction) bool {
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openAuctions = append(openAuctions, a)
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return false
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})
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// shuffle auctions slice so that bids are evenly distributed across auctions
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r.Shuffle(len(openAuctions), func(i, j int) {
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openAuctions[i], openAuctions[j] = openAuctions[j], openAuctions[i]
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})
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// search through auctions and accounts to find a pair where a bid can be placed (ie account has enough coins to place bid on auction)
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blockTime := ctx.BlockHeader().Time
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params := keeper.GetParams(ctx)
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bidder, openAuction, found := findValidAccountAuctionPair(accs, openAuctions, func(acc simulation.Account, auc types.Auction) bool {
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account := ak.GetAccount(ctx, acc.Address)
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_, err := generateBidAmount(r, params, auc, account, blockTime)
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if err == errorNotEnoughCoins || err == errorCantReceiveBids {
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return false // keep searching
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} else if err != nil {
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panic(err) // raise errors
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}
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return true // found valid pair
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})
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if !found {
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return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (no valid auction and bidder)", "", false, nil), nil, nil
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}
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bidderAcc := ak.GetAccount(ctx, bidder.Address)
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if bidderAcc == nil {
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return simulation.NoOpMsg(types.ModuleName), nil, fmt.Errorf("couldn't find account %s", bidder.Address)
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}
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// pick a bid amount for the chosen auction and bidder
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amount, err := generateBidAmount(r, params, openAuction, bidderAcc, blockTime)
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if err != nil { // shouldn't happen given the checks above
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return simulation.NoOpMsg(types.ModuleName), nil, err
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}
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// create and deliver a tx
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msg := types.NewMsgPlaceBid(openAuction.GetID(), bidder.Address, amount)
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tx := helpers.GenTx(
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[]sdk.Msg{msg},
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sdk.NewCoins(), // TODO pick a random amount fees
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helpers.DefaultGenTxGas,
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chainID,
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[]uint64{bidderAcc.GetAccountNumber()},
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[]uint64{bidderAcc.GetSequence()},
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bidder.PrivKey,
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)
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_, _, err = app.Deliver(tx)
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if err != nil {
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// to aid debugging, add the stack trace to the comment field of the returned opMsg
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return simulation.NewOperationMsg(msg, false, fmt.Sprintf("%+v", err)), nil, err
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}
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return simulation.NewOperationMsg(msg, true, ""), nil, nil
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}
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}
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func generateBidAmount(
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r *rand.Rand, params types.Params, auc types.Auction,
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bidder authexported.Account, blockTime time.Time,
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) (sdk.Coin, error) {
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bidderBalance := bidder.SpendableCoins(blockTime)
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switch a := auc.(type) {
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case types.DebtAuction:
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// Check bidder has enough (stable coin) to pay in
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if bidderBalance.AmountOf(a.Bid.Denom).LT(a.Bid.Amount) { // stable coin
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return sdk.Coin{}, errorNotEnoughCoins
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}
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// Check auction can still receive new bids
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if a.Lot.Amount.Equal(sdk.ZeroInt()) {
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return sdk.Coin{}, errorCantReceiveBids
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}
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// Generate a new lot amount (gov coin)
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maxNewLotAmt := a.Lot.Amount.Sub( // new lot must be some % less than old lot, and at least 1 smaller to avoid replacing an old bid at no cost
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sdk.MaxInt(
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sdk.NewInt(1),
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sdk.NewDecFromInt(a.Lot.Amount).Mul(params.IncrementDebt).RoundInt(),
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),
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)
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amt, err := RandIntInclusive(r, sdk.ZeroInt(), maxNewLotAmt) // maxNewLotAmt shouldn't be < 0 given the check above
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if err != nil {
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panic(err)
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}
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return sdk.NewCoin(a.Lot.Denom, amt), nil // gov coin
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case types.SurplusAuction:
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// Check the bidder has enough (gov coin) to pay in
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minNewBidAmt := a.Bid.Amount.Add( // new bids must be some % greater than old bid, and at least 1 larger to avoid replacing an old bid at no cost
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sdk.MaxInt(
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sdk.NewInt(1),
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sdk.NewDecFromInt(a.Bid.Amount).Mul(params.IncrementSurplus).RoundInt(),
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),
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)
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if bidderBalance.AmountOf(a.Bid.Denom).LT(minNewBidAmt) { // gov coin
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return sdk.Coin{}, errorNotEnoughCoins
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}
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// Generate a new bid amount (gov coin)
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amt, err := RandIntInclusive(r, minNewBidAmt, bidderBalance.AmountOf(a.Bid.Denom))
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if err != nil {
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panic(err)
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}
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return sdk.NewCoin(a.Bid.Denom, amt), nil // gov coin
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case types.CollateralAuction:
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// Check the bidder has enough (stable coin) to pay in
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minNewBidAmt := a.Bid.Amount.Add( // new bids must be some % greater than old bid, and at least 1 larger to avoid replacing an old bid at no cost
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sdk.MaxInt(
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sdk.NewInt(1),
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sdk.NewDecFromInt(a.Bid.Amount).Mul(params.IncrementCollateral).RoundInt(),
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),
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)
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minNewBidAmt = sdk.MinInt(minNewBidAmt, a.MaxBid.Amount) // allow new bids to hit MaxBid even though it may be less than the increment %
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if bidderBalance.AmountOf(a.Bid.Denom).LT(minNewBidAmt) {
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return sdk.Coin{}, errorNotEnoughCoins
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}
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// Check auction can still receive new bids
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if a.IsReversePhase() && a.Lot.Amount.Equal(sdk.ZeroInt()) {
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return sdk.Coin{}, errorCantReceiveBids
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}
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// Generate a new bid amount (collateral coin in reverse phase)
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if a.IsReversePhase() {
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maxNewLotAmt := a.Lot.Amount.Sub( // new lot must be some % less than old lot, and at least 1 smaller to avoid replacing an old bid at no cost
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sdk.MaxInt(
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sdk.NewInt(1),
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sdk.NewDecFromInt(a.Lot.Amount).Mul(params.IncrementCollateral).RoundInt(),
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),
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)
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amt, err := RandIntInclusive(r, sdk.ZeroInt(), maxNewLotAmt) // maxNewLotAmt shouldn't be < 0 given the check above
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if err != nil {
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panic(err)
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}
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return sdk.NewCoin(a.Lot.Denom, amt), nil // collateral coin
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// Generate a new bid amount (stable coin in forward phase)
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} else {
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amt, err := RandIntInclusive(r, minNewBidAmt, sdk.MinInt(bidderBalance.AmountOf(a.Bid.Denom), a.MaxBid.Amount))
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if err != nil {
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panic(err)
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}
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// when the bidder has enough coins, pick the MaxBid amount more frequently to increase chance auctions phase get into reverse phase
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if r.Intn(2) == 0 && bidderBalance.AmountOf(a.Bid.Denom).GTE(a.MaxBid.Amount) { // 50%
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amt = a.MaxBid.Amount
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}
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return sdk.NewCoin(a.Bid.Denom, amt), nil // stable coin
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}
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default:
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return sdk.Coin{}, fmt.Errorf("unknown auction type")
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}
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}
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// findValidAccountAuctionPair finds an auction and account for which the callback func returns true
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func findValidAccountAuctionPair(accounts []simulation.Account, auctions types.Auctions, cb func(simulation.Account, types.Auction) bool) (simulation.Account, types.Auction, bool) {
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for _, auc := range auctions {
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for _, acc := range accounts {
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if isValid := cb(acc, auc); isValid {
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return acc, auc, true
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}
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}
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}
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return simulation.Account{}, nil, false
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}
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// RandIntInclusive randomly generates an sdk.Int in the range [inclusiveMin, inclusiveMax]. It works for negative and positive integers.
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func RandIntInclusive(r *rand.Rand, inclusiveMin, inclusiveMax sdk.Int) (sdk.Int, error) {
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if inclusiveMin.GT(inclusiveMax) {
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return sdk.Int{}, fmt.Errorf("min larger than max")
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}
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return RandInt(r, inclusiveMin, inclusiveMax.Add(sdk.OneInt()))
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}
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// RandInt randomly generates an sdk.Int in the range [inclusiveMin, exclusiveMax). It works for negative and positive integers.
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func RandInt(r *rand.Rand, inclusiveMin, exclusiveMax sdk.Int) (sdk.Int, error) {
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// validate input
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if inclusiveMin.GTE(exclusiveMax) {
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return sdk.Int{}, fmt.Errorf("min larger or equal to max")
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}
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// shift the range to start at 0
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shiftedRange := exclusiveMax.Sub(inclusiveMin) // should always be positive given the check above
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// randomly pick from the shifted range
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shiftedRandInt := sdk.NewIntFromBigInt(new(big.Int).Rand(r, shiftedRange.BigInt()))
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// shift back to the original range
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return shiftedRandInt.Add(inclusiveMin), nil
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}
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