package simulation import ( "fmt" "math/rand" "time" "github.com/cosmos/cosmos-sdk/codec" sdk "github.com/cosmos/cosmos-sdk/types" "github.com/cosmos/cosmos-sdk/types/module" "github.com/cosmos/cosmos-sdk/x/simulation" "github.com/kava-labs/kava/x/kavadist/types" ) // SecondsPerYear is the number of seconds in a year const ( SecondsPerYear = 31536000 // BaseAprPadding sets the minimum inflation to the calculated SPR inflation rate from being 0.0 BaseAprPadding = "0.000000003022265980" ) // RandomizedGenState generates a random GenesisState for kavadist module func RandomizedGenState(simState *module.SimulationState) { params := genRandomParams(simState) if err := params.Validate(); err != nil { panic(err) } kavadistGenesis := types.NewGenesisState(params, types.DefaultPreviousBlockTime) if err := kavadistGenesis.Validate(); err != nil { panic(err) } fmt.Printf("Selected randomly generated %s parameters:\n%s\n", types.ModuleName, codec.MustMarshalJSONIndent(simState.Cdc, kavadistGenesis)) simState.GenState[types.ModuleName] = simState.Cdc.MustMarshalJSON(kavadistGenesis) } func genRandomParams(simState *module.SimulationState) types.Params { periods := genRandomPeriods(simState.Rand, simState.GenTimestamp) params := types.NewParams(true, periods) return params } func genRandomPeriods(r *rand.Rand, timestamp time.Time) types.Periods { var periods types.Periods numPeriods := simulation.RandIntBetween(r, 1, 10) periodStart := timestamp for i := 0; i < numPeriods; i++ { // set periods to be between 1-3 days durationMultiplier := simulation.RandIntBetween(r, 1, 3) duration := time.Duration(int64(24*durationMultiplier)) * time.Hour periodEnd := periodStart.Add(duration) inflation := genRandomInflation(r) period := types.NewPeriod(periodStart, periodEnd, inflation) periods = append(periods, period) periodStart = periodEnd } return periods } func genRandomInflation(r *rand.Rand) sdk.Dec { // If sim.RandomDecAmount is less than base apr padding, add base apr padding aprPadding, _ := sdk.NewDecFromStr(BaseAprPadding) extraAprInflation := simulation.RandomDecAmount(r, sdk.MustNewDecFromStr("0.25")) for extraAprInflation.LT(aprPadding) { extraAprInflation = extraAprInflation.Add(aprPadding) } aprInflation := sdk.OneDec().Add(extraAprInflation) // convert APR inflation to SPR (inflation per second) inflationSpr, err := aprInflation.ApproxRoot(uint64(SecondsPerYear)) if err != nil { panic(fmt.Sprintf("error generating random inflation %v", err)) } return inflationSpr } func genRandomActive(r *rand.Rand) bool { threshold := 50 value := simulation.RandIntBetween(r, 1, 100) return value > threshold }