genesis.go

package simulation

import (
	"encoding/json"
	"fmt"
	"math/rand"

	"cosmossdk.io/math"

	"github.com/cosmos/cosmos-sdk/types/module"
	"github.com/cosmos/cosmos-sdk/x/mint/types"
)

// Simulation parameter constants
const (
	Inflation           = "inflation"
	InflationRateChange = "inflation_rate_change"
	InflationMax        = "inflation_max"
	InflationMin        = "inflation_min"
	GoalBonded          = "goal_bonded"
)

// GenInflation randomized Inflation
func GenInflation(r *rand.Rand) math.LegacyDec {
	return math.LegacyNewDecWithPrec(int64(r.Intn(99)), 2)
}

// GenInflationRateChange randomized InflationRateChange
func GenInflationRateChange(r *rand.Rand) math.LegacyDec {
	return math.LegacyNewDecWithPrec(int64(r.Intn(99)), 2)
}

// GenInflationMax randomized InflationMax
func GenInflationMax(r *rand.Rand) math.LegacyDec {
	return math.LegacyNewDecWithPrec(20, 2)
}

// GenInflationMin randomized InflationMin
func GenInflationMin(r *rand.Rand) math.LegacyDec {
	return math.LegacyNewDecWithPrec(7, 2)
}

// GenGoalBonded randomized GoalBonded
func GenGoalBonded(r *rand.Rand) math.LegacyDec {
	return math.LegacyNewDecWithPrec(67, 2)
}

// RandomizedGenState generates a random GenesisState for mint
func RandomizedGenState(simState *module.SimulationState) {
	// minter
	var inflation math.LegacyDec
	simState.AppParams.GetOrGenerate(Inflation, &inflation, simState.Rand, func(r *rand.Rand) { inflation = GenInflation(r) })

	// params
	var inflationRateChange math.LegacyDec
	simState.AppParams.GetOrGenerate(InflationRateChange, &inflationRateChange, simState.Rand, func(r *rand.Rand) { inflationRateChange = GenInflationRateChange(r) })

	var inflationMax math.LegacyDec
	simState.AppParams.GetOrGenerate(InflationMax, &inflationMax, simState.Rand, func(r *rand.Rand) { inflationMax = GenInflationMax(r) })

	var inflationMin math.LegacyDec
	simState.AppParams.GetOrGenerate(InflationMin, &inflationMin, simState.Rand, func(r *rand.Rand) { inflationMin = GenInflationMin(r) })

	var goalBonded math.LegacyDec
	simState.AppParams.GetOrGenerate(GoalBonded, &goalBonded, simState.Rand, func(r *rand.Rand) { goalBonded = GenGoalBonded(r) })

	mintDenom := simState.BondDenom
	blocksPerYear := uint64(60 * 60 * 8766 / 5)
	params := types.NewParams(mintDenom, inflationRateChange, inflationMax, inflationMin, goalBonded, blocksPerYear)

	mintGenesis := types.NewGenesisState(types.InitialMinter(inflation), params)

	bz, err := json.MarshalIndent(&mintGenesis, "", " ")
	if err != nil {
		panic(err)
	}
	fmt.Printf("Selected randomly generated minting parameters:\n%s\n", bz)
	simState.GenState[types.ModuleName] = simState.Cdc.MustMarshalJSON(mintGenesis)
}