63 lines
1.6 KiB
Go
63 lines
1.6 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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"github.com/cosmos/cosmos-sdk/baseapp"
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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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"github.com/cosmos/cosmos-sdk/x/mock/simulation"
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)
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// SimulateDeductFee
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func SimulateDeductFee(m auth.AccountMapper, f auth.FeeCollectionKeeper) simulation.Operation {
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return func(r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context,
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accs []simulation.Account, event func(string)) (
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action string, fOp []simulation.FutureOperation, err error) {
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account := simulation.RandomAcc(r, accs)
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stored := m.GetAccount(ctx, account.Address)
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initCoins := stored.GetCoins()
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if len(initCoins) == 0 {
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event(fmt.Sprintf("auth/SimulateDeductFee/false"))
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return action, nil, nil
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}
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denomIndex := r.Intn(len(initCoins))
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amt, err := randPositiveInt(r, initCoins[denomIndex].Amount)
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if err != nil {
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event(fmt.Sprintf("auth/SimulateDeductFee/false"))
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return action, nil, nil
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}
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coins := sdk.Coins{sdk.NewCoin(initCoins[denomIndex].Denom, amt)}
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err = stored.SetCoins(initCoins.Minus(coins))
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if err != nil {
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panic(err)
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}
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m.SetAccount(ctx, stored)
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if !coins.IsNotNegative() {
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panic("setting negative fees")
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}
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f.AddCollectedFees(ctx, coins)
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event(fmt.Sprintf("auth/SimulateDeductFee/true"))
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action = "TestDeductFee"
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return action, nil, nil
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}
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}
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func randPositiveInt(r *rand.Rand, max sdk.Int) (sdk.Int, error) {
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if !max.GT(sdk.OneInt()) {
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return sdk.Int{}, errors.New("max too small")
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}
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max = max.Sub(sdk.OneInt())
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return sdk.NewIntFromBigInt(new(big.Int).Rand(r, max.BigInt())).Add(sdk.OneInt()), nil
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}
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