233 lines
6.4 KiB
Go
233 lines
6.4 KiB
Go
package full
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import (
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"context"
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"math"
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"math/rand"
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"sort"
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"github.com/filecoin-project/lotus/api"
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"github.com/filecoin-project/lotus/build"
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"github.com/filecoin-project/lotus/chain/messagepool"
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"github.com/filecoin-project/lotus/chain/stmgr"
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"github.com/filecoin-project/lotus/chain/store"
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"github.com/filecoin-project/lotus/chain/types"
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"github.com/filecoin-project/go-address"
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"github.com/filecoin-project/specs-actors/actors/abi"
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"github.com/filecoin-project/specs-actors/actors/abi/big"
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"github.com/filecoin-project/specs-actors/actors/builtin"
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"github.com/filecoin-project/specs-actors/actors/runtime/exitcode"
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"go.uber.org/fx"
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"golang.org/x/xerrors"
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)
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type GasAPI struct {
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fx.In
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Stmgr *stmgr.StateManager
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Chain *store.ChainStore
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Mpool *messagepool.MessagePool
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}
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const MinGasPremium = 100e3
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const MaxSpendOnFeeDenom = 100
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func (a *GasAPI) GasEstimateFeeCap(ctx context.Context, msg *types.Message, maxqueueblks int64,
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tsk types.TipSetKey) (types.BigInt, error) {
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ts := a.Chain.GetHeaviestTipSet()
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parentBaseFee := ts.Blocks()[0].ParentBaseFee
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increaseFactor := math.Pow(1.+1./float64(build.BaseFeeMaxChangeDenom), float64(maxqueueblks))
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feeInFuture := types.BigMul(parentBaseFee, types.NewInt(uint64(increaseFactor*(1<<8))))
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out := types.BigDiv(feeInFuture, types.NewInt(1<<8))
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if msg.GasPremium != types.EmptyInt {
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out = types.BigAdd(out, msg.GasPremium)
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}
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return out, nil
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}
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func (a *GasAPI) GasEstimateGasPremium(ctx context.Context, nblocksincl uint64,
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sender address.Address, gaslimit int64, _ types.TipSetKey) (types.BigInt, error) {
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if nblocksincl == 0 {
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nblocksincl = 1
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}
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type gasMeta struct {
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price big.Int
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limit int64
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}
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var prices []gasMeta
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var blocks int
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ts := a.Chain.GetHeaviestTipSet()
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for i := uint64(0); i < nblocksincl*2; i++ {
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if ts.Height() == 0 {
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break // genesis
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}
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pts, err := a.Chain.LoadTipSet(ts.Parents())
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if err != nil {
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return types.BigInt{}, err
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}
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blocks += len(pts.Blocks())
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msgs, err := a.Chain.MessagesForTipset(pts)
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if err != nil {
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return types.BigInt{}, xerrors.Errorf("loading messages: %w", err)
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}
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for _, msg := range msgs {
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prices = append(prices, gasMeta{
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price: msg.VMMessage().GasPremium,
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limit: msg.VMMessage().GasLimit,
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})
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}
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ts = pts
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}
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sort.Slice(prices, func(i, j int) bool {
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// sort desc by price
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return prices[i].price.GreaterThan(prices[j].price)
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})
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at := build.BlockGasTarget * int64(blocks) / 2
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prev1, prev2 := big.Zero(), big.Zero()
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for _, price := range prices {
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prev1, prev2 = price.price, prev1
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at -= price.limit
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if at > 0 {
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continue
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}
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}
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premium := prev1
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if prev2.Sign() != 0 {
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premium = big.Div(types.BigAdd(prev1, prev2), types.NewInt(2))
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}
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if types.BigCmp(premium, types.NewInt(MinGasPremium)) < 0 {
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switch nblocksincl {
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case 1:
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premium = types.NewInt(2 * MinGasPremium)
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case 2:
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premium = types.NewInt(1.5 * MinGasPremium)
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default:
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premium = types.NewInt(MinGasPremium)
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}
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}
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// add some noise to normalize behaviour of message selection
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const precision = 32
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// mean 1, stddev 0.005 => 95% within +-1%
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noise := 1 + rand.NormFloat64()*0.005
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premium = types.BigMul(premium, types.NewInt(uint64(noise*(1<<precision))+1))
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premium = types.BigDiv(premium, types.NewInt(1<<precision))
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return premium, nil
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}
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func (a *GasAPI) GasEstimateGasLimit(ctx context.Context, msgIn *types.Message, _ types.TipSetKey) (int64, error) {
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msg := *msgIn
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msg.GasLimit = build.BlockGasLimit
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msg.GasFeeCap = types.NewInt(uint64(build.MinimumBaseFee) + 1)
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msg.GasPremium = types.NewInt(1)
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currTs := a.Chain.GetHeaviestTipSet()
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fromA, err := a.Stmgr.ResolveToKeyAddress(ctx, msgIn.From, currTs)
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if err != nil {
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return -1, xerrors.Errorf("getting key address: %w", err)
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}
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pending, ts := a.Mpool.PendingFor(fromA)
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priorMsgs := make([]types.ChainMsg, 0, len(pending))
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for _, m := range pending {
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priorMsgs = append(priorMsgs, m)
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}
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res, err := a.Stmgr.CallWithGas(ctx, &msg, priorMsgs, ts)
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if err != nil {
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return -1, xerrors.Errorf("CallWithGas failed: %w", err)
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}
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if res.MsgRct.ExitCode != exitcode.Ok {
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return -1, xerrors.Errorf("message execution failed: exit %s, reason: %s", res.MsgRct.ExitCode, res.Error)
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}
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// Special case for PaymentChannel collect, which is deleting actor
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var act types.Actor
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err = a.Stmgr.WithParentState(ts, a.Stmgr.WithActor(msg.To, stmgr.GetActor(&act)))
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if err != nil {
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_ = err
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// somewhat ignore it as it can happen and we just want to detect
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// an existing PaymentChannel actor
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return res.MsgRct.GasUsed, nil
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}
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if !act.Code.Equals(builtin.PaymentChannelActorCodeID) {
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return res.MsgRct.GasUsed, nil
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}
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if msgIn.Method != builtin.MethodsPaych.Collect {
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return res.MsgRct.GasUsed, nil
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}
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// return GasUsed without the refund for DestoryActor
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return res.MsgRct.GasUsed + 76e3, nil
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}
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func (a *GasAPI) GasEstimateMessageGas(ctx context.Context, msg *types.Message, spec *api.MessageSendSpec, _ types.TipSetKey) (*types.Message, error) {
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if msg.GasLimit == 0 {
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gasLimit, err := a.GasEstimateGasLimit(ctx, msg, types.TipSetKey{})
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if err != nil {
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return nil, xerrors.Errorf("estimating gas used: %w", err)
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}
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msg.GasLimit = int64(float64(gasLimit) * a.Mpool.GetConfig().GasLimitOverestimation)
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}
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if msg.GasPremium == types.EmptyInt || types.BigCmp(msg.GasPremium, types.NewInt(0)) == 0 {
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gasPremium, err := a.GasEstimateGasPremium(ctx, 2, msg.From, msg.GasLimit, types.TipSetKey{})
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if err != nil {
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return nil, xerrors.Errorf("estimating gas price: %w", err)
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}
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msg.GasPremium = gasPremium
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}
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if msg.GasFeeCap == types.EmptyInt || types.BigCmp(msg.GasFeeCap, types.NewInt(0)) == 0 {
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feeCap, err := a.GasEstimateFeeCap(ctx, msg, 10, types.EmptyTSK)
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if err != nil {
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return nil, xerrors.Errorf("estimating fee cap: %w", err)
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}
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msg.GasFeeCap = feeCap
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}
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capGasFee(msg, spec.Get().MaxFee)
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return msg, nil
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}
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func capGasFee(msg *types.Message, maxFee abi.TokenAmount) {
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if maxFee.Equals(big.Zero()) {
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maxFee = types.NewInt(build.FilecoinPrecision / 10)
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}
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gl := types.NewInt(uint64(msg.GasLimit))
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totalFee := types.BigMul(msg.GasFeeCap, gl)
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minerFee := types.BigMul(msg.GasPremium, gl)
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if totalFee.LessThanEqual(maxFee) {
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return
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}
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// scale chain/miner fee down proportionally to fit in our budget
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// TODO: there are probably smarter things we can do here to optimize
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// message inclusion latency
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msg.GasFeeCap = big.Div(maxFee, gl)
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msg.GasPremium = big.Div(big.Div(big.Mul(minerFee, maxFee), totalFee), gl)
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}
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