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fake.go
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fake.go
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package simulation
import (
"errors"
"fmt"
"math/big"
"math/rand"
"github.com/cosmos/cosmos-sdk/baseapp"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/auth"
"github.com/cosmos/cosmos-sdk/x/mock/simulation"
)
// SimulateDeductFee
func SimulateDeductFee(m auth.AccountKeeper, f auth.FeeCollectionKeeper) simulation.Operation {
return func(r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context,
accs []simulation.Account, event func(string)) (
action string, fOp []simulation.FutureOperation, err error) {
account := simulation.RandomAcc(r, accs)
stored := m.GetAccount(ctx, account.Address)
initCoins := stored.GetCoins()
if len(initCoins) == 0 {
event(fmt.Sprintf("auth/SimulateDeductFee/false"))
return action, nil, nil
}
denomIndex := r.Intn(len(initCoins))
randCoin := initCoins[denomIndex]
amt, err := randPositiveInt(r, randCoin.Amount)
if err != nil {
event(fmt.Sprintf("auth/SimulateDeductFee/false"))
return action, nil, nil
}
// Create a random fee and verify the fees are within the account's spendable
// balance.
fees := sdk.Coins{sdk.NewCoin(randCoin.Denom, amt)}
spendableCoins := stored.SpendableCoins(ctx.BlockHeader().Time)
if _, hasNeg := spendableCoins.SafeSub(fees); hasNeg {
event(fmt.Sprintf("auth/SimulateDeductFee/false"))
return action, nil, nil
}
// get the new account balance
newCoins, hasNeg := initCoins.SafeSub(fees)
if hasNeg {
event(fmt.Sprintf("auth/SimulateDeductFee/false"))
return action, nil, nil
}
if err := stored.SetCoins(newCoins); err != nil {
panic(err)
}
m.SetAccount(ctx, stored)
f.AddCollectedFees(ctx, fees)
event(fmt.Sprintf("auth/SimulateDeductFee/true"))
action = "TestDeductFee"
return action, nil, nil
}
}
func randPositiveInt(r *rand.Rand, max sdk.Int) (sdk.Int, error) {
if !max.GT(sdk.OneInt()) {
return sdk.Int{}, errors.New("max too small")
}
max = max.Sub(sdk.OneInt())
return sdk.NewIntFromBigInt(new(big.Int).Rand(r, max.BigInt())).Add(sdk.OneInt()), nil
}