0g-chain/x/bep3/simulation/operations.go

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package simulation
import (
"fmt"
"math"
"math/rand"
"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"
"github.com/cosmos/cosmos-sdk/x/simulation"
appparams "github.com/kava-labs/kava/app/params"
"github.com/kava-labs/kava/x/bep3/keeper"
"github.com/kava-labs/kava/x/bep3/types"
)
var (
noOpMsg = simulation.NoOpMsg(types.ModuleName)
)
// Simulation operation weights constants
const (
OpWeightMsgCreateAtomicSwap = "op_weight_msg_create_atomic_swap"
)
// 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 weightCreateAtomicSwap int
appParams.GetOrGenerate(cdc, OpWeightMsgCreateAtomicSwap, &weightCreateAtomicSwap, nil,
func(_ *rand.Rand) {
weightCreateAtomicSwap = appparams.DefaultWeightMsgCreateAtomicSwap
},
)
return simulation.WeightedOperations{
simulation.NewWeightedOperation(
weightCreateAtomicSwap,
SimulateMsgCreateAtomicSwap(ak, k),
),
}
}
// SimulateMsgCreateAtomicSwap generates a MsgCreateAtomicSwap with random values
func SimulateMsgCreateAtomicSwap(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) {
// Set up deputy address as it's required for all atomic swaps
deputyAddr := k.GetBnbDeputyAddress(ctx)
deputyAcc, foundDeputy := simulation.FindAccount(accs, deputyAddr)
if !foundDeputy {
return noOpMsg, nil, nil
}
// Get asset supplies and shuffle them
supplies := k.GetAllAssetSupplies(ctx)
r.Shuffle(len(supplies), func(i, j int) {
supplies[i], supplies[j] = supplies[j], supplies[i]
})
// Search for an account that holds coins received by an atomic swap
bnbDeputyFixedFee := k.GetBnbDeputyFixedFee(ctx)
senderOut, asset, found := findValidAccountAssetSupplyPair(accs, supplies, func(acc simulation.Account, asset types.AssetSupply) bool {
if asset.CurrentSupply.Amount.IsPositive() {
authAcc := ak.GetAccount(ctx, acc.Address)
if authAcc.SpendableCoins(ctx.BlockTime()).AmountOf(asset.Denom).GT(sdk.NewIntFromUint64(bnbDeputyFixedFee)) {
return true
}
}
return false
})
// Set sender, recipient, and denom depending on swap direction
var sender simulation.Account
var recipient simulation.Account
var denom string
// If an outgoing swap can be created, it's chosen 50% of the time.
if found && r.Intn(100) < 50 {
sender = senderOut
recipient = deputyAcc
denom = asset.Denom
} else {
sender = deputyAcc
recipient, _ = simulation.RandomAcc(r, accs)
// Randomly select an asset from supported assets
assets, foundAsset := k.GetAssets(ctx)
if !foundAsset {
return noOpMsg, nil, fmt.Errorf("no supported assets found")
}
denom = assets[r.Intn(len(assets))].Denom
}
recipientOtherChain := simulation.RandStringOfLength(r, 43)
senderOtherChain := simulation.RandStringOfLength(r, 43)
// Generate cryptographically strong pseudo-random number
randomNumber, err := simulation.RandPositiveInt(r, sdk.NewInt(math.MaxInt64))
if err != nil {
return noOpMsg, nil, err
}
// Must use current blocktime instead of 'now' since initial blocktime was randomly generated
timestamp := ctx.BlockTime().Unix()
randomNumberHash := types.CalculateRandomHash(randomNumber.BigInt().Bytes(), timestamp)
// Check that the sender has coins for fee
senderAcc := ak.GetAccount(ctx, sender.Address)
fees, err := simulation.RandomFees(r, ctx, senderAcc.SpendableCoins(ctx.BlockTime()))
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
// Get maximum valid amount
maximumAmount := senderAcc.SpendableCoins(ctx.BlockTime()).Sub(fees).AmountOf(denom)
// The maximum amount for outgoing swaps is limited by the asset's current supply
if recipient.Equals(deputyAcc) {
assetSupply, foundAssetSupply := k.GetAssetSupply(ctx, []byte(denom))
if !foundAssetSupply {
return noOpMsg, nil, fmt.Errorf("no asset supply found")
}
if maximumAmount.GT(assetSupply.CurrentSupply.Amount) {
maximumAmount = assetSupply.CurrentSupply.Amount
}
}
// Get an amount of coins between 0.1 and 2% of total coins
amount := maximumAmount.Quo(sdk.NewInt(int64(simulation.RandIntBetween(r, 50, 1000))))
if amount.LT(sdk.NewIntFromUint64(bnbDeputyFixedFee)) {
return simulation.NewOperationMsgBasic(types.ModuleName, fmt.Sprintf("no-operation (all funds exhausted for asset %s)", denom), "", false, nil), nil, nil
}
coins := sdk.NewCoins(sdk.NewCoin(denom, amount))
// We're assuming that sims are run with -NumBlocks=100
heightSpan := uint64(55)
msg := types.NewMsgCreateAtomicSwap(
sender.Address, recipient.Address, recipientOtherChain, senderOtherChain,
randomNumberHash, timestamp, coins, heightSpan,
)
tx := helpers.GenTx(
[]sdk.Msg{msg},
fees,
helpers.DefaultGenTxGas,
chainID,
[]uint64{senderAcc.GetAccountNumber()},
[]uint64{senderAcc.GetSequence()},
sender.PrivKey,
)
_, result, err := app.Deliver(tx)
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
// Construct a MsgClaimAtomicSwap or MsgRefundAtomicSwap future operation
var futureOp simulation.FutureOperation
swapID := types.CalculateSwapID(msg.RandomNumberHash, msg.From, msg.SenderOtherChain)
if r.Intn(100) < 50 {
// Claim future operation
executionBlock := uint64(ctx.BlockHeight()) + msg.HeightSpan/2
futureOp = simulation.FutureOperation{
BlockHeight: int(executionBlock),
Op: operationClaimAtomicSwap(ak, k, swapID, randomNumber.BigInt().Bytes()),
}
} else {
// Refund future operation
executionBlock := uint64(ctx.BlockHeight()) + msg.HeightSpan
futureOp = simulation.FutureOperation{
BlockHeight: int(executionBlock),
Op: operationRefundAtomicSwap(ak, k, swapID),
}
}
return simulation.NewOperationMsg(msg, true, result.Log), []simulation.FutureOperation{futureOp}, nil
}
}
func operationClaimAtomicSwap(ak types.AccountKeeper, k keeper.Keeper, swapID []byte, randomNumber []byte) simulation.Operation {
return func(
r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
) (simulation.OperationMsg, []simulation.FutureOperation, error) {
simAccount, _ := simulation.RandomAcc(r, accs)
acc := ak.GetAccount(ctx, simAccount.Address)
msg := types.NewMsgClaimAtomicSwap(acc.GetAddress(), swapID, randomNumber)
fees, err := simulation.RandomFees(r, ctx, acc.SpendableCoins(ctx.BlockTime()))
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
tx := helpers.GenTx(
[]sdk.Msg{msg},
fees,
helpers.DefaultGenTxGas,
chainID,
[]uint64{acc.GetAccountNumber()},
[]uint64{acc.GetSequence()},
simAccount.PrivKey,
)
_, result, err := app.Deliver(tx)
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
}
}
func operationRefundAtomicSwap(ak types.AccountKeeper, k keeper.Keeper, swapID []byte) simulation.Operation {
return func(
r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
) (simulation.OperationMsg, []simulation.FutureOperation, error) {
simAccount, _ := simulation.RandomAcc(r, accs)
acc := ak.GetAccount(ctx, simAccount.Address)
msg := types.NewMsgRefundAtomicSwap(acc.GetAddress(), swapID)
fees, err := simulation.RandomFees(r, ctx, acc.SpendableCoins(ctx.BlockTime()))
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
tx := helpers.GenTx(
[]sdk.Msg{msg},
fees,
helpers.DefaultGenTxGas,
chainID,
[]uint64{acc.GetAccountNumber()},
[]uint64{acc.GetSequence()},
simAccount.PrivKey,
)
_, result, err := app.Deliver(tx)
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
}
}
// findValidAccountAssetSupplyPair finds an account for which the callback func returns true
func findValidAccountAssetSupplyPair(accounts []simulation.Account, supplies types.AssetSupplies,
cb func(simulation.Account, types.AssetSupply) bool) (simulation.Account, types.AssetSupply, bool) {
for _, supply := range supplies {
for _, acc := range accounts {
if isValid := cb(acc, supply); isValid {
return acc, supply, true
}
}
}
return simulation.Account{}, types.AssetSupply{}, false
}