lotus/miner/miner.go

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package miner
import (
"context"
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"sync"
"time"
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"github.com/filecoin-project/lotus/api"
"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/chain/actors"
"github.com/filecoin-project/lotus/chain/address"
"github.com/filecoin-project/lotus/chain/gen"
"github.com/filecoin-project/lotus/chain/types"
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logging "github.com/ipfs/go-log"
"go.opencensus.io/trace"
"golang.org/x/xerrors"
)
var log = logging.Logger("miner")
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type waitFunc func(ctx context.Context) error
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func NewMiner(api api.FullNode, epp gen.ElectionPoStProver) *Miner {
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return &Miner{
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api: api,
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epp: epp,
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waitFunc: func(ctx context.Context) error {
// Wait around for half the block time in case other parents come in
time.Sleep(build.PropagationDelay * time.Second)
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return nil
},
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}
}
type Miner struct {
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api api.FullNode
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epp gen.ElectionPoStProver
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lk sync.Mutex
addresses []address.Address
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stop chan struct{}
stopping chan struct{}
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waitFunc waitFunc
lastWork *MiningBase
}
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func (m *Miner) Addresses() ([]address.Address, error) {
m.lk.Lock()
defer m.lk.Unlock()
out := make([]address.Address, len(m.addresses))
copy(out, m.addresses)
return out, nil
}
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func (m *Miner) Register(addr address.Address) error {
m.lk.Lock()
defer m.lk.Unlock()
if len(m.addresses) > 0 {
for _, a := range m.addresses {
if a == addr {
log.Warnf("miner.Register called more than once for actor '%s'", addr)
return xerrors.Errorf("miner.Register called more than once for actor '%s'", addr)
}
}
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}
m.addresses = append(m.addresses, addr)
if len(m.addresses) == 1 {
m.stop = make(chan struct{})
go m.mine(context.TODO())
}
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return nil
}
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func (m *Miner) Unregister(ctx context.Context, addr address.Address) error {
m.lk.Lock()
defer m.lk.Unlock()
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if len(m.addresses) == 0 {
return xerrors.New("no addresses registered")
}
idx := -1
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for i, a := range m.addresses {
if a == addr {
idx = i
break
}
}
if idx == -1 {
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return xerrors.New("unregister: address not found")
}
m.addresses[idx] = m.addresses[len(m.addresses)-1]
m.addresses = m.addresses[:len(m.addresses)-1]
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// Unregistering last address, stop mining first
if len(m.addresses) == 0 && m.stop != nil {
m.stopping = make(chan struct{})
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stopping := m.stopping
close(m.stop)
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select {
case <-stopping:
case <-ctx.Done():
return ctx.Err()
}
}
return nil
}
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func (m *Miner) mine(ctx context.Context) {
ctx, span := trace.StartSpan(ctx, "/mine")
defer span.End()
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var lastBase MiningBase
eventLoop:
for {
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select {
case <-m.stop:
stopping := m.stopping
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m.stop = nil
m.stopping = nil
close(stopping)
return
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default:
}
m.lk.Lock()
addrs := m.addresses
m.lk.Unlock()
// Sleep a small amount in order to wait for other blocks to arrive
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if err := m.waitFunc(ctx); err != nil {
log.Error(err)
return
}
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base, err := m.GetBestMiningCandidate(ctx)
if err != nil {
log.Errorf("failed to get best mining candidate: %s", err)
continue
}
if base.ts.Equals(lastBase.ts) && lastBase.nullRounds == base.nullRounds {
log.Warnf("BestMiningCandidate from the previous round: %s (nulls:%d)", lastBase.ts.Cids(), lastBase.nullRounds)
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time.Sleep(build.BlockDelay * time.Second)
continue
}
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lastBase = *base
blks := make([]*types.BlockMsg, 0)
for _, addr := range addrs {
b, err := m.mineOne(ctx, addr, base)
if err != nil {
log.Errorf("mining block failed: %+v", err)
continue
}
if b != nil {
blks = append(blks, b)
}
}
if len(blks) != 0 {
btime := time.Unix(int64(blks[0].Header.Timestamp), 0)
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if time.Now().Before(btime) {
time.Sleep(time.Until(btime))
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} else {
log.Warnw("mined block in the past", "block-time", btime,
"time", time.Now(), "duration", time.Now().Sub(btime))
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}
mWon := make(map[address.Address]struct{})
for _, b := range blks {
_, notOk := mWon[b.Header.Miner]
if notOk {
log.Errorw("2 blocks for the same miner. Throwing hands in the air. Report this. It is important.", "bloks", blks)
continue eventLoop
}
mWon[b.Header.Miner] = struct{}{}
}
for _, b := range blks {
if err := m.api.SyncSubmitBlock(ctx, b); err != nil {
log.Errorf("failed to submit newly mined block: %s", err)
}
}
} else {
nextRound := time.Unix(int64(base.ts.MinTimestamp()+uint64(build.BlockDelay*base.nullRounds)), 0)
time.Sleep(time.Until(nextRound))
}
}
}
type MiningBase struct {
ts *types.TipSet
nullRounds uint64
}
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func (m *Miner) GetBestMiningCandidate(ctx context.Context) (*MiningBase, error) {
bts, err := m.api.ChainHead(ctx)
if err != nil {
return nil, err
}
if m.lastWork != nil {
if m.lastWork.ts.Equals(bts) {
return m.lastWork, nil
}
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btsw, err := m.api.ChainTipSetWeight(ctx, bts)
if err != nil {
return nil, err
}
ltsw, err := m.api.ChainTipSetWeight(ctx, m.lastWork.ts)
if err != nil {
return nil, err
}
if types.BigCmp(btsw, ltsw) <= 0 {
return m.lastWork, nil
}
}
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m.lastWork = &MiningBase{ts: bts}
return m.lastWork, nil
}
func (m *Miner) hasPower(ctx context.Context, addr address.Address, ts *types.TipSet) (bool, error) {
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power, err := m.api.StateMinerPower(ctx, addr, ts)
if err != nil {
return false, err
}
return power.MinerPower.Equals(types.NewInt(0)), nil
}
func (m *Miner) mineOne(ctx context.Context, addr address.Address, base *MiningBase) (*types.BlockMsg, error) {
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log.Debugw("attempting to mine a block", "tipset", types.LogCids(base.ts.Cids()))
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start := time.Now()
hasPower, err := m.hasPower(ctx, addr, base.ts)
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if err != nil {
return nil, xerrors.Errorf("checking if miner is slashed: %w", err)
}
if hasPower {
// slashed or just have no power yet
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base.nullRounds++
return nil, nil
}
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ticket, err := m.computeTicket(ctx, addr, base)
if err != nil {
return nil, xerrors.Errorf("scratching ticket failed: %w", err)
}
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proofin, err := gen.IsRoundWinner(ctx, base.ts, int64(base.ts.Height()+base.nullRounds+1), addr, m.epp, m.api)
if err != nil {
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return nil, xerrors.Errorf("failed to check if we win next round: %w", err)
}
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if proofin == nil {
base.nullRounds++
return nil, nil
}
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// get pending messages early,
pending, err := m.api.MpoolPending(context.TODO(), base.ts)
if err != nil {
return nil, xerrors.Errorf("failed to get pending messages: %w", err)
}
proof, err := gen.ComputeProof(ctx, m.epp, proofin)
if err != nil {
return nil, xerrors.Errorf("computing election proof: %w", err)
}
b, err := m.createBlock(base, addr, ticket, proof, pending)
if err != nil {
return nil, xerrors.Errorf("failed to create block: %w", err)
}
log.Infow("mined new block", "cid", b.Cid(), "height", b.Header.Height)
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dur := time.Now().Sub(start)
log.Infof("Creating block took %s", dur)
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if dur > time.Second*build.BlockDelay {
log.Warn("CAUTION: block production took longer than the block delay. Your computer may not be fast enough to keep up")
}
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return b, nil
}
func (m *Miner) computeVRF(ctx context.Context, addr address.Address, input []byte) ([]byte, error) {
w, err := m.getMinerWorker(ctx, addr, nil)
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if err != nil {
return nil, err
}
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return gen.ComputeVRF(ctx, m.api.WalletSign, w, addr, gen.DSepTicket, input)
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}
func (m *Miner) getMinerWorker(ctx context.Context, addr address.Address, ts *types.TipSet) (address.Address, error) {
ret, err := m.api.StateCall(ctx, &types.Message{
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From: addr,
To: addr,
Method: actors.MAMethods.GetWorkerAddr,
}, ts)
if err != nil {
return address.Undef, xerrors.Errorf("failed to get miner worker addr: %w", err)
}
if ret.ExitCode != 0 {
return address.Undef, xerrors.Errorf("failed to get miner worker addr (exit code %d)", ret.ExitCode)
}
w, err := address.NewFromBytes(ret.Return)
if err != nil {
return address.Undef, xerrors.Errorf("GetWorkerAddr returned malformed address: %w", err)
}
return w, nil
}
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func (m *Miner) computeTicket(ctx context.Context, addr address.Address, base *MiningBase) (*types.Ticket, error) {
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vrfBase := base.ts.MinTicket().VRFProof
vrfOut, err := m.computeVRF(ctx, addr, vrfBase)
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if err != nil {
return nil, err
}
return &types.Ticket{
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VRFProof: vrfOut,
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}, nil
}
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func (m *Miner) createBlock(base *MiningBase, addr address.Address, ticket *types.Ticket, proof *types.EPostProof, pending []*types.SignedMessage) (*types.BlockMsg, error) {
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msgs, err := selectMessages(context.TODO(), m.api.StateGetActor, base, pending)
if err != nil {
return nil, xerrors.Errorf("message filtering failed: %w", err)
}
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uts := base.ts.MinTimestamp() + uint64(build.BlockDelay*(base.nullRounds+1))
nheight := base.ts.Height() + base.nullRounds + 1
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// why even return this? that api call could just submit it for us
return m.api.MinerCreateBlock(context.TODO(), addr, base.ts, ticket, proof, msgs, nheight, uint64(uts))
}
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type actorLookup func(context.Context, address.Address, *types.TipSet) (*types.Actor, error)
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func countFrom(msgs []*types.SignedMessage, from address.Address) (out int) {
for _, msg := range msgs {
if msg.Message.From == from {
out++
}
}
return out
}
func selectMessages(ctx context.Context, al actorLookup, base *MiningBase, msgs []*types.SignedMessage) ([]*types.SignedMessage, error) {
out := make([]*types.SignedMessage, 0, len(msgs))
inclNonces := make(map[address.Address]uint64)
inclBalances := make(map[address.Address]types.BigInt)
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for _, msg := range msgs {
if msg.Message.To == address.Undef {
log.Warnf("message in mempool had bad 'To' address")
continue
}
from := msg.Message.From
if _, ok := inclNonces[from]; !ok {
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act, err := al(ctx, from, base.ts)
if err != nil {
return nil, xerrors.Errorf("failed to check message sender balance: %w", err)
}
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inclNonces[from] = act.Nonce
inclBalances[from] = act.Balance
}
if inclBalances[from].LessThan(msg.Message.RequiredFunds()) {
log.Warnf("message in mempool does not have enough funds: %s", msg.Cid())
continue
}
if msg.Message.Nonce > inclNonces[from] {
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log.Warnf("message in mempool has too high of a nonce (%d > %d) %s (%d pending for orig)", msg.Message.Nonce, inclNonces[from], msg.Cid(), countFrom(msgs, from))
continue
}
if msg.Message.Nonce < inclNonces[from] {
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log.Warnf("message in mempool has already used nonce (%d < %d), from %s, to %s, %s (%d pending for)", msg.Message.Nonce, inclNonces[from], msg.Message.From, msg.Message.To, msg.Cid(), countFrom(msgs, from))
continue
}
inclNonces[from] = msg.Message.Nonce + 1
inclBalances[from] = types.BigSub(inclBalances[from], msg.Message.RequiredFunds())
out = append(out, msg)
}
return out, nil
}