mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-11-14 03:55:19 +00:00
614d4e40fe
* Update cometbft, cosmos, ethermint, and ibc-go * Replace github.com/tendermint/tendermint by github.com/cometbft/cometbft * Replace github.com/tendermint/tm-db by github.com/cometbft/cometbft-db * Replace gogo/protobuf with cosmos/gogoproto & simapp replacement * Replace cosmos-sdk/simapp/helpers with cosmos-sdk/testutil/sims * Remove no longer used simulations * Replace ibchost with ibcexported See https://github.com/cosmos/ibc-go/blob/v7.2.2/docs/migrations/v6-to-v7.md#ibc-module-constants * Add new consensus params keeper * Add consensus keeper to blockers * Fix keeper and module issues in app.go * Add IsSendEnabledCoins and update SetParams interface changes * Fix protobuf build for cosmos 47 (#1800) * fix cp errors by using -f; fix lint by only linting our proto dir; and use proofs.proto directly from ics23 for ibc-go v7 * run proto-all; commit updated third party deps and swagger changes * regenerate proto files * use correct gocosmos build plugin for buf * re-gen all protobuf files to update paths for new gocosmos plugin * update protoc and buf to latest versions * fix staking keeper issues in app.go * update tally handler for gov changes * chain id fix and flag fixes * update deps for cometbft 47.7 upgrade * remove all module legacy queriers * update stakingKeeper to pointer * Replace ModuleCdc from govv1beta1 to govcodec * remove simulations * abci.LastCommitInfo → abci.CommitInfo * Remove unused code in keys.go * simapp.MakeTestEncodingConfig -> moduletestutil.MakeTestEncodingConfi * Fix chain id issues in tests * Fix remaining unit test issues * Update changelog for upgrade * Fix e2e tests using updated kvtool * Update protonet to v47 compatible genesis * Bump cometbft-db to v0.9.1-kava.1 * Update kvtool * Remove extra changelog * Fix merged rocksdb issues * go mod cleanup * Bump cometbft-db to v9 and go to 1.21 * Bump rocksdb version to v8.10.0 * Update kvtool to latest version * Update gin to v1.9.0 * Use ibctm.ModuleName in app_test * Fallback to genesis chain id instead of client toml * Remove all simulations * Fix cdp migrations issue with v47 * Update dependencies to correct tags --------- Co-authored-by: Nick DeLuca <nickdeluca08@gmail.com>
422 lines
17 KiB
Go
422 lines
17 KiB
Go
package testutil
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"math/rand"
|
|
"time"
|
|
|
|
tmproto "github.com/cometbft/cometbft/proto/tendermint/types"
|
|
"github.com/stretchr/testify/suite"
|
|
|
|
sdkmath "cosmossdk.io/math"
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
|
|
"github.com/kava-labs/kava/app"
|
|
"github.com/kava-labs/kava/x/community"
|
|
"github.com/kava-labs/kava/x/community/keeper"
|
|
"github.com/kava-labs/kava/x/community/types"
|
|
)
|
|
|
|
// StakingRewardsTestSuite tests staking rewards per second logic
|
|
type stakingRewardsTestSuite struct {
|
|
suite.Suite
|
|
|
|
App app.TestApp
|
|
Keeper keeper.Keeper
|
|
|
|
testFunc testFunc
|
|
}
|
|
|
|
func NewStakingRewardsTestSuite(tf testFunc) *stakingRewardsTestSuite {
|
|
suite := &stakingRewardsTestSuite{}
|
|
suite.testFunc = tf
|
|
return suite
|
|
}
|
|
|
|
// The default state used by each test
|
|
func (suite *stakingRewardsTestSuite) SetupTest() {
|
|
app.SetSDKConfig()
|
|
|
|
tApp := app.NewTestApp()
|
|
tApp.InitializeFromGenesisStates()
|
|
|
|
suite.App = tApp
|
|
suite.Keeper = suite.App.GetCommunityKeeper()
|
|
}
|
|
|
|
func (suite *stakingRewardsTestSuite) TestStakingRewards() {
|
|
testCases := []struct {
|
|
// name of subtest
|
|
name string
|
|
|
|
// block time of first block
|
|
periodStart time.Time
|
|
// block time of last block
|
|
periodEnd time.Time
|
|
|
|
// block time n will be periodStart + rand(range_min...range_max)*(n-1) up to periodEnd
|
|
blockTimeRangeMin float64
|
|
blockTimeRangeMax float64
|
|
|
|
// rewards per second to set in state
|
|
rewardsPerSecond sdkmath.LegacyDec
|
|
|
|
// the amount of ukava to mint and transfer to the community pool
|
|
// to use to pay for rewards
|
|
communityPoolFunds sdkmath.Int
|
|
|
|
// how many total rewards are expected to be accumulated in ukava
|
|
expectedRewardsTotal sdkmath.Int
|
|
}{
|
|
// ** These take a long time to run **
|
|
//{
|
|
// name: "one year with 0.5 to 1 second block times",
|
|
// periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
// periodEnd: time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
// blockTimeRangeMin: 0.5,
|
|
// blockTimeRangeMax: 1,
|
|
// rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("1585489.599188229325215626"),
|
|
// expectedRewardsTotal: sdkmath.NewInt(49999999999999), // 50 million KAVA per year
|
|
//},
|
|
//{
|
|
// name: "one year with 5.5 to 6.5 second blocktimes",
|
|
// periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
// periodEnd: time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
// blockTimeRangeMin: 5.5,
|
|
// blockTimeRangeMax: 6.5,
|
|
// rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("1585489.599188229325215626"), // 50 million kava per year
|
|
// communityPoolFunds: sdkmath.NewInt(50000000000000),
|
|
// expectedRewardsTotal: sdkmath.NewInt(49999999999999), // truncation results in 1 ukava error
|
|
//},
|
|
//
|
|
//
|
|
// One Day of blocks with different block time variations
|
|
//
|
|
//
|
|
{
|
|
name: "one day with sub-second block times and 50 million KAVA per year",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 0.1,
|
|
blockTimeRangeMax: 1,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("1585489.599188229325215626"), // 50 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(200000000000),
|
|
expectedRewardsTotal: sdkmath.NewInt(136986301369), // 50 million / 365 days - 1 ukava
|
|
|
|
},
|
|
{
|
|
name: "one day with 5.5 to 6.5 second block times and 50 million KAVA per year",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 5.5,
|
|
blockTimeRangeMax: 6.5,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("1585489.599188229325215626"), // 50 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(200000000000),
|
|
expectedRewardsTotal: sdkmath.NewInt(136986301369), // 50 million / 365 days - 1 ukava
|
|
},
|
|
//
|
|
//
|
|
// Total time span under 1 second
|
|
//
|
|
//
|
|
{
|
|
name: "single 6.9 second time span and 25 million KAVA per year",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 1, 0, 0, 6, 900000000, time.UTC),
|
|
blockTimeRangeMin: 10, // forces only two blocks -- one time span
|
|
blockTimeRangeMax: 10,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("792744.799594114662607813"), // 25 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(10000000),
|
|
expectedRewardsTotal: sdkmath.NewInt(5469939), // per second rate * 6.9
|
|
},
|
|
{
|
|
name: "multiple blocks across sub-second time span nd 10 million KAVA per year",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 1, 0, 0, 0, 800000000, time.UTC),
|
|
blockTimeRangeMin: 0.1, // multiple blocks in a sub-second time span
|
|
blockTimeRangeMax: 0.2,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("317097.919837645865043125"), // 10 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(300000),
|
|
expectedRewardsTotal: sdkmath.NewInt(253678), // per second rate * 0.8
|
|
},
|
|
//
|
|
//
|
|
// Variations of community pool balance
|
|
//
|
|
//
|
|
{
|
|
name: "community pool exact funds -- should spend community to zero and not panic",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 5.5,
|
|
blockTimeRangeMax: 6.2,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("317097.919837645865043125"), // 10 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(27397260273),
|
|
expectedRewardsTotal: sdkmath.NewInt(27397260273),
|
|
},
|
|
{
|
|
name: "community pool under funded -- should spend community pool to down to zero and not panic",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 5.5,
|
|
blockTimeRangeMax: 6.5,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("1585489.599188229325215626"), // 25 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(100000000000), // under funded
|
|
expectedRewardsTotal: sdkmath.NewInt(100000000000), // rewards max is the community pool balance
|
|
},
|
|
{
|
|
name: "community pool no funds -- should pay zero rewards and not panic",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 5.5,
|
|
blockTimeRangeMax: 6.5,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("792744.799594114662607813"), // 25 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(0),
|
|
expectedRewardsTotal: sdkmath.NewInt(0),
|
|
},
|
|
//
|
|
//
|
|
// Disabled
|
|
//
|
|
//
|
|
{
|
|
name: "zero rewards per second results in zero rewards paid",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 5.5,
|
|
blockTimeRangeMax: 6.5,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("0.000000000000000000"), // 25 million kava per year
|
|
communityPoolFunds: sdkmath.NewInt(100000000000000),
|
|
expectedRewardsTotal: sdkmath.NewInt(0),
|
|
},
|
|
//
|
|
//
|
|
// Test underlying calculations are safe and overflow/underflow bounds are reasonable
|
|
//
|
|
//
|
|
{
|
|
name: "does not overflow with extremely large per second value and extremely large single block durations",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2033, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 315619200, // a single 10 year long block in seconds (w/ 3 leap years)
|
|
blockTimeRangeMax: 315619200, // a single 10 year long block in seconds (w/ 3 leap years)
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("100000000000000000000000000.000000000000000000"), // 100 million kava per second in 18 decimal form
|
|
communityPoolFunds: newIntFromString("40000000000000000000000000000000000"),
|
|
expectedRewardsTotal: newIntFromString("31561920000000000000000000000000000"), // 10 years worth of rewards (with three leap years)
|
|
},
|
|
{
|
|
name: "able to accumulate decimal ukava units across blocks",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 5.5,
|
|
blockTimeRangeMax: 6.5,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("0.100000000000000000"), // blocks are not long enough to accumulate a single ukava with this rate
|
|
communityPoolFunds: sdkmath.NewInt(10000),
|
|
expectedRewardsTotal: sdkmath.NewInt(8640),
|
|
},
|
|
{
|
|
name: "down to 1 ukava per year can be accumulated -- we are safe from underflow at reasonably small values",
|
|
periodStart: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
periodEnd: time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC),
|
|
blockTimeRangeMin: 60, // large block times speed up this test case
|
|
blockTimeRangeMax: 120,
|
|
rewardsPerSecond: sdkmath.LegacyMustNewDecFromStr("0.000000031709791984"),
|
|
communityPoolFunds: sdkmath.NewInt(1),
|
|
expectedRewardsTotal: sdkmath.NewInt(1),
|
|
},
|
|
}
|
|
|
|
for _, tc := range testCases {
|
|
suite.Run(tc.name, func() {
|
|
suite.SetupTest()
|
|
|
|
// keepers
|
|
keeper := suite.Keeper
|
|
accountKeeper := suite.App.GetAccountKeeper()
|
|
bankKeeper := suite.App.GetBankKeeper()
|
|
|
|
// initial context at height 1
|
|
height := int64(1)
|
|
blockTime := tc.periodStart
|
|
ctx := suite.App.NewContext(true, tmproto.Header{Height: height, Time: blockTime})
|
|
|
|
// ensure community pool balance matches the test expectations
|
|
poolAcc := accountKeeper.GetModuleAccount(ctx, types.ModuleName)
|
|
// community pool balance should start at zero
|
|
suite.Require().True(bankKeeper.GetBalance(ctx, poolAcc.GetAddress(), "ukava").Amount.IsZero(), "expected community pool to start with zero coins in test genesis")
|
|
// fund withexact amount from test case
|
|
suite.App.FundAccount(ctx, poolAcc.GetAddress(), sdk.NewCoins(sdk.NewCoin("ukava", tc.communityPoolFunds)))
|
|
|
|
// get starting balance of fee collector to substract later in case this is non-zero in genesis
|
|
feeCollectorAcc := accountKeeper.GetModuleAccount(ctx, authtypes.FeeCollectorName)
|
|
initialFeeCollectorBalance := bankKeeper.GetBalance(ctx, feeCollectorAcc.GetAddress(), "ukava").Amount
|
|
|
|
// set rewards per second in state
|
|
params, found := keeper.GetParams(ctx)
|
|
suite.Require().True(found)
|
|
params.StakingRewardsPerSecond = tc.rewardsPerSecond
|
|
keeper.SetParams(ctx, params)
|
|
|
|
stakingRewardEvents := sdk.Events{}
|
|
|
|
for {
|
|
// run community begin blocker logic
|
|
suite.testFunc(ctx, keeper)
|
|
|
|
// accumulate event rewards from events
|
|
stakingRewardEvents = append(stakingRewardEvents, filterStakingRewardEvents(ctx.EventManager().Events())...)
|
|
|
|
// exit loop if we are at last block
|
|
if blockTime.Equal(tc.periodEnd) {
|
|
break
|
|
}
|
|
|
|
// create random block duration in nanoseconds
|
|
randomBlockDurationInSeconds := tc.blockTimeRangeMin + rand.Float64()*(tc.blockTimeRangeMax-tc.blockTimeRangeMin)
|
|
nextBlockDuration := time.Duration(randomBlockDurationInSeconds * math.Pow10(9))
|
|
|
|
// move to next block by incrementing height, adding random duration, and settings new context
|
|
height++
|
|
blockTime = blockTime.Add(nextBlockDuration)
|
|
// set last block to exact end of period if we go past
|
|
if blockTime.After(tc.periodEnd) {
|
|
blockTime = tc.periodEnd
|
|
}
|
|
ctx = suite.App.NewContext(true, tmproto.Header{Height: height, Time: blockTime})
|
|
}
|
|
|
|
endingFeeCollectorBalance := bankKeeper.GetBalance(ctx, feeCollectorAcc.GetAddress(), "ukava").Amount
|
|
feeCollectorBalanceAdded := endingFeeCollectorBalance.Sub(initialFeeCollectorBalance)
|
|
|
|
// assert fee pool was payed the correct rewards
|
|
suite.Equal(tc.expectedRewardsTotal.String(), feeCollectorBalanceAdded.String(), "expected fee collector balance to match")
|
|
|
|
if tc.expectedRewardsTotal.IsZero() {
|
|
suite.Equal(0, len(stakingRewardEvents), "expected no events to be emitted")
|
|
} else {
|
|
// we add up all reward coin events
|
|
eventCoins := getRewardCoinsFromEvents(stakingRewardEvents)
|
|
|
|
// assert events emitted match expected rewards
|
|
suite.Equal(
|
|
tc.expectedRewardsTotal.String(),
|
|
eventCoins.AmountOf("ukava").String(),
|
|
"expected event coins to match",
|
|
)
|
|
}
|
|
|
|
// assert the community pool deducted the same amount
|
|
expectedCommunityPoolBalance := tc.communityPoolFunds.Sub(tc.expectedRewardsTotal)
|
|
actualCommunityPoolBalance := bankKeeper.GetBalance(ctx, poolAcc.GetAddress(), "ukava").Amount
|
|
suite.Equal(expectedCommunityPoolBalance.String(), actualCommunityPoolBalance.String(), "expected community pool balance to match")
|
|
})
|
|
}
|
|
|
|
}
|
|
|
|
func (suite *stakingRewardsTestSuite) TestStakingRewardsDoNotAccumulateWhenPoolIsDrained() {
|
|
app := suite.App
|
|
keeper := suite.Keeper
|
|
accountKeeper := suite.App.GetAccountKeeper()
|
|
bankKeeper := suite.App.GetBankKeeper()
|
|
|
|
// first block
|
|
blockTime := time.Now()
|
|
ctx := app.NewContext(true, tmproto.Header{Height: 1, Time: blockTime})
|
|
|
|
poolAcc := accountKeeper.GetModuleAccount(ctx, types.ModuleName)
|
|
feeCollectorAcc := accountKeeper.GetModuleAccount(ctx, authtypes.FeeCollectorName)
|
|
|
|
// set state to pay staking rewards
|
|
params, _ := keeper.GetParams(ctx)
|
|
// we set a decimal amount that ensures after 10 seconds we overspend the community pool
|
|
// with enough truncation error that we would have an ending balance of 20.000001 if it was
|
|
// carried over after the pool run out of funds
|
|
params.StakingRewardsPerSecond = sdkmath.LegacyMustNewDecFromStr("1000000.099999999999999999") // > 1 KAVA per second
|
|
keeper.SetParams(ctx, params)
|
|
|
|
// fund community pool account
|
|
app.FundAccount(ctx, poolAcc.GetAddress(), sdk.NewCoins(sdk.NewCoin("ukava", sdkmath.NewInt(10000000)))) // 10 KAVA
|
|
initialFeeCollectorBalance := bankKeeper.GetBalance(ctx, feeCollectorAcc.GetAddress(), "ukava").Amount
|
|
|
|
// run first block (no rewards hapeen on first block)
|
|
community.BeginBlocker(ctx, keeper)
|
|
|
|
// run second block 10 seconds in future and spend all community pool rewards
|
|
blockTime = blockTime.Add(10 * time.Second)
|
|
ctx = app.NewContext(true, tmproto.Header{Height: 2, Time: blockTime})
|
|
community.BeginBlocker(ctx, keeper)
|
|
|
|
// run third block 10 seconds in future which no rewards will be paid
|
|
blockTime = blockTime.Add(10 * time.Second)
|
|
ctx = app.NewContext(true, tmproto.Header{Height: 3, Time: blockTime})
|
|
community.BeginBlocker(ctx, keeper)
|
|
|
|
// run fourth block 10 seconds in future which no rewards will be paid
|
|
blockTime = blockTime.Add(10 * time.Second)
|
|
ctx = app.NewContext(true, tmproto.Header{Height: 4, Time: blockTime})
|
|
community.BeginBlocker(ctx, keeper)
|
|
|
|
// refund the community pool with 100 KAVA -- plenty of funds
|
|
app.FundAccount(ctx, poolAcc.GetAddress(), sdk.NewCoins(sdk.NewCoin("ukava", sdkmath.NewInt(100000000)))) // 100 KAVA
|
|
|
|
// run fifth block 10 seconds in future which no rewards will be paid
|
|
blockTime = blockTime.Add(10 * time.Second)
|
|
ctx = app.NewContext(true, tmproto.Header{Height: 5, Time: blockTime})
|
|
community.BeginBlocker(ctx, keeper)
|
|
|
|
// assert that only 20 total KAVA has been distributed in rewards
|
|
// and blocks where community pool had d
|
|
rewards := bankKeeper.GetBalance(ctx, feeCollectorAcc.GetAddress(), "ukava").Amount.Sub(initialFeeCollectorBalance)
|
|
suite.Require().Equal(sdkmath.NewInt(20000000).String(), rewards.String())
|
|
}
|
|
|
|
func (suite *stakingRewardsTestSuite) TestPanicsOnMissingParameters() {
|
|
suite.SetupTest()
|
|
|
|
ctx := suite.App.NewContext(true, tmproto.Header{Height: 1, Time: time.Now()})
|
|
store := ctx.KVStore(suite.App.GetKVStoreKey(types.StoreKey))
|
|
store.Delete(types.ParamsKey)
|
|
|
|
suite.PanicsWithValue("invalid state: module parameters not found", func() {
|
|
suite.testFunc(ctx, suite.Keeper)
|
|
})
|
|
}
|
|
|
|
// newIntFromString returns a new sdkmath.Int from a string
|
|
func newIntFromString(str string) sdkmath.Int {
|
|
num, ok := sdkmath.NewIntFromString(str)
|
|
if !ok {
|
|
panic(fmt.Sprintf("overflow creating Int from %s", str))
|
|
}
|
|
return num
|
|
}
|
|
|
|
func filterStakingRewardEvents(events sdk.Events) (rewardEvents sdk.Events) {
|
|
for _, event := range events {
|
|
if event.Type == types.EventTypeStakingRewardsPaid {
|
|
rewardEvents = append(rewardEvents, event)
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func getRewardCoinsFromEvents(events sdk.Events) sdk.Coins {
|
|
coins := sdk.NewCoins()
|
|
|
|
for _, event := range events {
|
|
if event.Type == types.EventTypeStakingRewardsPaid {
|
|
rewards, err := sdk.ParseCoinNormalized(string(event.Attributes[0].Value))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
coins = coins.Add(rewards)
|
|
}
|
|
}
|
|
|
|
return coins
|
|
}
|