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manager.go
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manager.go
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package manager
import (
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/auth"
"github.com/lino-network/lino/param"
linotypes "github.com/lino-network/lino/types"
account "github.com/lino-network/lino/x/account"
"github.com/lino-network/lino/x/bandwidth/model"
"github.com/lino-network/lino/x/bandwidth/types"
developer "github.com/lino-network/lino/x/developer"
global "github.com/lino-network/lino/x/global"
vote "github.com/lino-network/lino/x/vote"
)
var BandwidthManagerTestMode bool = false
// BandwidthManager - bandwidth manager
type BandwidthManager struct {
storage model.BandwidthStorage
paramHolder param.ParamKeeper
// deps
gm global.GlobalKeeper
vm vote.VoteKeeper
dm developer.DeveloperKeeper
am account.AccountKeeper
}
func NewBandwidthManager(key sdk.StoreKey, holder param.ParamKeeper, gm global.GlobalKeeper, vm vote.VoteKeeper, dm developer.DeveloperKeeper, am account.AccountKeeper) *BandwidthManager {
return &BandwidthManager{
storage: model.NewBandwidthStorage(key),
paramHolder: holder,
gm: gm,
vm: vm,
dm: dm,
am: am,
}
}
// InitGenesis - initialize KV Store
func (bm BandwidthManager) InitGenesis(ctx sdk.Context) error {
bandwidthInfo := &model.BandwidthInfo{
GeneralMsgEMA: sdk.NewDec(0),
AppMsgEMA: sdk.NewDec(0),
MaxMPS: sdk.NewDec(0),
}
if err := bm.storage.SetBandwidthInfo(ctx, bandwidthInfo); err != nil {
return err
}
blockInfo := &model.BlockInfo{
TotalMsgSignedByApp: 0,
TotalMsgSignedByUser: 0,
CurMsgFee: linotypes.NewCoinFromInt64(int64(0)),
CurU: sdk.NewDec(1),
}
if err := bm.storage.SetBlockInfo(ctx, blockInfo); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) PrecheckAndConsumeBandwidthCredit(ctx sdk.Context, accKey linotypes.AccountKey) sdk.Error {
appBandwidthInfo, err := bm.storage.GetAppBandwidthInfo(ctx, accKey)
if err != nil {
return err
}
blockInfo, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
if appBandwidthInfo.CurBandwidthCredit.LT(blockInfo.CurU) {
return types.ErrAppBandwidthNotEnough()
}
// consume u at first
appBandwidthInfo.CurBandwidthCredit = appBandwidthInfo.CurBandwidthCredit.Sub(blockInfo.CurU)
if err := bm.storage.SetAppBandwidthInfo(ctx, accKey, appBandwidthInfo); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) IsUserMsgFeeEnough(ctx sdk.Context, fee auth.StdFee) bool {
if !fee.Amount.IsValid() {
return false
}
providedFee := linotypes.NewCoinFromInt64(fee.Amount.AmountOf(linotypes.LinoCoinDenom).Int64())
info, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return false
}
return providedFee.IsGTE(info.CurMsgFee)
}
func (bm BandwidthManager) AddMsgSignedByApp(ctx sdk.Context, accKey linotypes.AccountKey, num int64) sdk.Error {
info, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
info.TotalMsgSignedByApp += num
if err := bm.storage.SetBlockInfo(ctx, info); err != nil {
return err
}
appBandwidthInfo, err := bm.storage.GetAppBandwidthInfo(ctx, accKey)
if err != nil {
return err
}
appBandwidthInfo.MessagesInCurBlock += 1
if err := bm.storage.SetAppBandwidthInfo(ctx, accKey, appBandwidthInfo); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) AddMsgSignedByUser(ctx sdk.Context, num int64) sdk.Error {
info, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
info.TotalMsgSignedByUser += num
if err := bm.storage.SetBlockInfo(ctx, info); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) ClearBlockInfo(ctx sdk.Context) sdk.Error {
info, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
info.TotalMsgSignedByUser = 0
info.TotalMsgSignedByApp = 0
if err := bm.storage.SetBlockInfo(ctx, info); err != nil {
return err
}
return nil
}
// calcuate the new EMA at the end of each block
func (bm BandwidthManager) UpdateMaxMPSAndEMA(ctx sdk.Context) sdk.Error {
lastBlockTime, err := bm.gm.GetLastBlockTime(ctx)
if err != nil {
return err
}
if lastBlockTime >= ctx.BlockHeader().Time.Unix() {
return nil
}
bandwidthInfo, err := bm.storage.GetBandwidthInfo(ctx)
if err != nil {
return err
}
blockInfo, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return err
}
pastTime := ctx.BlockHeader().Time.Unix() - lastBlockTime
// EMA_general = EMA_general_prev * (1 - k_general) + generalMPS * k_general
generalMPS := linotypes.NewDecFromRat(blockInfo.TotalMsgSignedByUser, pastTime)
bandwidthInfo.GeneralMsgEMA = bm.calculateEMA(bandwidthInfo.GeneralMsgEMA, params.GeneralMsgEMAFactor, generalMPS)
// EMA_app = EMA_app_prev * (1 - k_app) + appMPS * k_app
appMPS := linotypes.NewDecFromRat(blockInfo.TotalMsgSignedByApp, pastTime)
bandwidthInfo.AppMsgEMA = bm.calculateEMA(bandwidthInfo.AppMsgEMA, params.AppMsgEMAFactor, appMPS)
// MaxMPS = max( (totalMsgSignedByUser + totalMsgSignedByApp)/(curBlockTime - lastBlockTime), MaxMPS)
totalMPS := linotypes.NewDecFromRat(blockInfo.TotalMsgSignedByUser+blockInfo.TotalMsgSignedByApp, pastTime)
if totalMPS.GT(bandwidthInfo.MaxMPS) {
bandwidthInfo.MaxMPS = totalMPS
}
if err := bm.storage.SetBandwidthInfo(ctx, bandwidthInfo); err != nil {
return err
}
return nil
}
// calcuate the current msg fee based on last block info at the beginning of each block
func (bm BandwidthManager) CalculateCurMsgFee(ctx sdk.Context) sdk.Error {
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return err
}
bandwidthInfo, err := bm.storage.GetBandwidthInfo(ctx)
if err != nil {
return err
}
blockInfo, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
generalMsgQuota, err := bm.getGeneralMsgQuota(ctx)
if err != nil {
return err
}
expResult := bm.approximateExp(bandwidthInfo.GeneralMsgEMA.Sub(generalMsgQuota).Quo(generalMsgQuota).Mul(params.MsgFeeFactorA))
msgFeeLino := expResult.Mul(params.MsgFeeFactorB)
blockInfo.CurMsgFee = linotypes.NewCoinFromInt64(msgFeeLino.Mul(sdk.NewDec(linotypes.Decimals)).RoundInt64())
if err := bm.storage.SetBlockInfo(ctx, blockInfo); err != nil {
return err
}
return nil
}
// calcuate the current vacancy coeef u based on last block info at the beginning of each block
func (bm BandwidthManager) CalculateCurU(ctx sdk.Context) sdk.Error {
bandwidthInfo, err := bm.storage.GetBandwidthInfo(ctx)
if err != nil {
return err
}
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return err
}
appMsgQuota, err := bm.getAppMsgQuota(ctx)
if err != nil {
return err
}
blockInfo, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
delta := bandwidthInfo.AppMsgEMA.Sub(appMsgQuota)
blockInfo.CurU = bm.approximateExp(delta.Quo(appMsgQuota).Mul(params.AppVacancyFactor))
if err := bm.storage.SetBlockInfo(ctx, blockInfo); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) DecayMaxMPS(ctx sdk.Context) sdk.Error {
bandwidthInfo, err := bm.storage.GetBandwidthInfo(ctx)
if err != nil {
return err
}
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return err
}
bandwidthInfo.MaxMPS = bandwidthInfo.MaxMPS.Mul(params.MaxMPSDecayRate)
if err := bm.storage.SetBandwidthInfo(ctx, bandwidthInfo); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) RefillAppBandwidthCredit(ctx sdk.Context, accKey linotypes.AccountKey) sdk.Error {
info, err := bm.storage.GetAppBandwidthInfo(ctx, accKey)
if err != nil {
return err
}
curTime := ctx.BlockHeader().Time.Unix()
if info.LastRefilledAt >= curTime {
return nil
}
if info.CurBandwidthCredit.GTE(info.MaxBandwidthCredit) {
return nil
}
pastSeconds := curTime - info.LastRefilledAt
// assume refill rate is equal to expectedMPS
newCredit := info.ExpectedMPS.Mul(sdk.NewDec(pastSeconds)).Add(info.CurBandwidthCredit)
if newCredit.GTE(info.MaxBandwidthCredit) {
info.CurBandwidthCredit = info.MaxBandwidthCredit
} else {
info.CurBandwidthCredit = newCredit
}
info.LastRefilledAt = curTime
if err := bm.storage.SetAppBandwidthInfo(ctx, accKey, info); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) GetPunishmentCoeff(ctx sdk.Context, accKey linotypes.AccountKey) (sdk.Dec, sdk.Error) {
lastBlockTime, err := bm.gm.GetLastBlockTime(ctx)
if err != nil {
return sdk.NewDec(1), err
}
pastTime := ctx.BlockHeader().Time.Unix() - lastBlockTime
if pastTime <= 0 {
return sdk.NewDec(1), nil
}
appInfo, err := bm.storage.GetAppBandwidthInfo(ctx, accKey)
if err != nil {
return sdk.NewDec(1), err
}
if !appInfo.ExpectedMPS.IsPositive() {
return sdk.NewDec(1), types.ErrInvalidExpectedMPS()
}
curMPS := linotypes.NewDecFromRat(appInfo.MessagesInCurBlock, pastTime)
delta := curMPS.Sub(appInfo.ExpectedMPS)
if delta.IsNegative() {
delta = sdk.NewDec(0)
}
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return sdk.NewDec(1), err
}
return bm.approximateExp(delta.Quo(appInfo.ExpectedMPS).Mul(params.AppPunishmentFactor)), nil
}
func (bm BandwidthManager) ConsumeBandwidthCredit(ctx sdk.Context, u sdk.Dec, p sdk.Dec, accKey linotypes.AccountKey) sdk.Error {
info, err := bm.storage.GetAppBandwidthInfo(ctx, accKey)
if err != nil {
return err
}
numMsgs := sdk.NewDec(info.MessagesInCurBlock)
// add back pre-check consumed bandwidth credit
info.CurBandwidthCredit = info.CurBandwidthCredit.Add(numMsgs.Mul(u))
// consume credit, currently allow the credit be negative
costPerMsg := bm.GetBandwidthCostPerMsg(ctx, u, p)
info.CurBandwidthCredit = info.CurBandwidthCredit.Sub(numMsgs.Mul(costPerMsg))
info.MessagesInCurBlock = 0
if err := bm.storage.SetAppBandwidthInfo(ctx, accKey, info); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) ReCalculateAppBandwidthInfo(ctx sdk.Context) sdk.Error {
totalAppStakeCoin := linotypes.NewCoinFromInt64(0)
// calculate all app total stake
for _, app := range bm.dm.GetLiveDevelopers(ctx) {
appStakeCoin, err := bm.vm.GetLinoStake(ctx, app.Username)
if err != nil {
return err
}
totalAppStakeCoin = totalAppStakeCoin.Plus(appStakeCoin)
}
if !totalAppStakeCoin.IsPositive() {
return nil
}
// calculate all app MPS quota
appMsgQuota, err := bm.getAppMsgQuota(ctx)
if err != nil {
return err
}
// calculate each app's share and expected MPS
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return err
}
for _, app := range bm.dm.GetLiveDevelopers(ctx) {
appStakeCoin, err := bm.vm.GetLinoStake(ctx, app.Username)
if err != nil {
return err
}
appStakePct := appStakeCoin.ToDec().Quo(totalAppStakeCoin.ToDec())
expectedMPS := appMsgQuota.Mul(appStakePct)
maxBandwidthCredit := expectedMPS.Mul(params.AppBandwidthPoolSize)
// first time app, refill it's current pool to the full
if !bm.storage.DoesAppBandwidthInfoExist(ctx, app.Username) {
newAppInfo := model.AppBandwidthInfo{
Username: app.Username,
MaxBandwidthCredit: maxBandwidthCredit,
CurBandwidthCredit: maxBandwidthCredit,
MessagesInCurBlock: 0,
ExpectedMPS: expectedMPS,
LastRefilledAt: ctx.BlockHeader().Time.Unix(),
}
if err := bm.storage.SetAppBandwidthInfo(ctx, app.Username, &newAppInfo); err != nil {
return err
}
} else {
// refill the bandwidth credit with old expectedMPS (refill rate)
if err := bm.RefillAppBandwidthCredit(ctx, app.Username); err != nil {
return err
}
// update it's max and expected MPS
info, err := bm.storage.GetAppBandwidthInfo(ctx, app.Username)
if err != nil {
return err
}
info.ExpectedMPS = expectedMPS
info.MaxBandwidthCredit = maxBandwidthCredit
if err := bm.storage.SetAppBandwidthInfo(ctx, app.Username, info); err != nil {
return err
}
}
}
return nil
}
func (bm BandwidthManager) CheckBandwidth(ctx sdk.Context, accKey linotypes.AccountKey, fee auth.StdFee) sdk.Error {
appName, err := bm.dm.GetAffiliatingApp(ctx, accKey)
if err != nil {
// msg fee for general message
if !bm.IsUserMsgFeeEnough(ctx, fee) {
return types.ErrUserMsgFeeNotEnough()
}
// minus message fee
info, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
// minus msg fee
if BandwidthManagerTestMode == false {
if err := bm.am.MinusCoinFromUsername(ctx, accKey, info.CurMsgFee); err != nil {
return err
}
if err := bm.gm.AddToValidatorInflationPool(ctx, info.CurMsgFee); err != nil {
return err
}
}
// add general message stats
if err := bm.AddMsgSignedByUser(ctx, 1); err != nil {
return err
}
} else {
// refill bandwidth for apps with messages in current block
if err := bm.RefillAppBandwidthCredit(ctx, appName); err != nil {
return err
}
// app bandwidth model
if err := bm.PrecheckAndConsumeBandwidthCredit(ctx, appName); err != nil {
return err
}
// add app message stats
if err := bm.AddMsgSignedByApp(ctx, appName, 1); err != nil {
return err
}
}
return nil
}
func (bm BandwidthManager) BeginBlocker(ctx sdk.Context) sdk.Error {
// calculate the new general msg fee for the current block
if err := bm.CalculateCurMsgFee(ctx); err != nil {
return err
}
// calculate the new vacancy coeff
if err := bm.CalculateCurU(ctx); err != nil {
return err
}
// clear stats for block info
if err := bm.ClearBlockInfo(ctx); err != nil {
return err
}
return nil
}
func (bm BandwidthManager) EndBlocker(ctx sdk.Context) sdk.Error {
// update maxMPS and EMA for different msgs and store cur block info
if err := bm.UpdateMaxMPSAndEMA(ctx); err != nil {
return err
}
blockInfo, err := bm.storage.GetBlockInfo(ctx)
if err != nil {
return err
}
// get all app bandwidth info
allInfo, err := bm.GetAllAppInfo(ctx)
if err != nil {
return err
}
for _, info := range allInfo {
if info.MessagesInCurBlock == 0 {
continue
}
// calculate cost and consume bandwidth credit
p, err := bm.GetPunishmentCoeff(ctx, info.Username)
if err != nil {
return err
}
if err := bm.ConsumeBandwidthCredit(ctx, blockInfo.CurU, p, info.Username); err != nil {
return err
}
}
return nil
}
func (bm BandwidthManager) GetBandwidthCostPerMsg(ctx sdk.Context, u sdk.Dec, p sdk.Dec) sdk.Dec {
return u.Mul(p)
}
func (bm BandwidthManager) GetAllAppInfo(ctx sdk.Context) ([]*model.AppBandwidthInfo, sdk.Error) {
return bm.storage.GetAllAppBandwidthInfo(ctx)
}
func (bm BandwidthManager) calculateEMA(prevEMA sdk.Dec, k sdk.Dec, curMPS sdk.Dec) sdk.Dec {
pre := prevEMA.Mul(sdk.NewDec(1).Sub(k))
cur := curMPS.Mul(k)
return pre.Add(cur)
}
func (bm BandwidthManager) approximateExp(x sdk.Dec) sdk.Dec {
prev := x
x = sdk.NewDec(1).Add(x.Abs().Quo(sdk.NewDec(1024)))
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
x = x.Mul(x)
if prev.LT(sdk.NewDec(0)) {
return sdk.NewDec(1).Quo(x)
}
return x
}
func (bm BandwidthManager) getAppMsgQuota(ctx sdk.Context) (sdk.Dec, sdk.Error) {
bandwidthInfo, err := bm.storage.GetBandwidthInfo(ctx)
if err != nil {
return sdk.NewDec(1), err
}
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return sdk.NewDec(1), err
}
var curMaxMPS sdk.Dec
if params.ExpectedMaxMPS.GT(bandwidthInfo.MaxMPS) {
curMaxMPS = params.ExpectedMaxMPS
} else {
curMaxMPS = bandwidthInfo.MaxMPS
}
appMsgQuota := params.AppMsgQuotaRatio.Mul(curMaxMPS)
if !appMsgQuota.IsPositive() {
return sdk.NewDec(1), types.ErrInvalidMsgQuota()
}
return appMsgQuota, nil
}
func (bm BandwidthManager) getGeneralMsgQuota(ctx sdk.Context) (sdk.Dec, sdk.Error) {
bandwidthInfo, err := bm.storage.GetBandwidthInfo(ctx)
if err != nil {
return sdk.NewDec(1), err
}
params, err := bm.paramHolder.GetBandwidthParam(ctx)
if err != nil {
return sdk.NewDec(1), err
}
var curMaxMPS sdk.Dec
if params.ExpectedMaxMPS.GT(bandwidthInfo.MaxMPS) {
curMaxMPS = params.ExpectedMaxMPS
} else {
curMaxMPS = bandwidthInfo.MaxMPS
}
generalMsgQuota := params.GeneralMsgQuotaRatio.Mul(curMaxMPS)
if !generalMsgQuota.IsPositive() {
return sdk.NewDec(1), types.ErrInvalidMsgQuota()
}
return generalMsgQuota, nil
}
// getter
func (bm BandwidthManager) GetBandwidthInfo(ctx sdk.Context) (*model.BandwidthInfo, sdk.Error) {
return bm.storage.GetBandwidthInfo(ctx)
}
func (bm BandwidthManager) GetBlockInfo(ctx sdk.Context) (*model.BlockInfo, sdk.Error) {
return bm.storage.GetBlockInfo(ctx)
}
func (bm BandwidthManager) GetAppBandwidthInfo(ctx sdk.Context, accKey linotypes.AccountKey) (*model.AppBandwidthInfo, sdk.Error) {
return bm.storage.GetAppBandwidthInfo(ctx, accKey)
}