lotus/chain/sync.go

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package chain
import (
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"bytes"
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"context"
"errors"
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"fmt"
"sync"
"time"
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"github.com/Gurpartap/async"
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amt "github.com/filecoin-project/go-amt-ipld"
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"github.com/filecoin-project/go-bls-sigs"
"github.com/hashicorp/go-multierror"
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"github.com/ipfs/go-cid"
dstore "github.com/ipfs/go-datastore"
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hamt "github.com/ipfs/go-hamt-ipld"
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bstore "github.com/ipfs/go-ipfs-blockstore"
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logging "github.com/ipfs/go-log"
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"github.com/libp2p/go-libp2p-core/peer"
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cbg "github.com/whyrusleeping/cbor-gen"
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"go.opencensus.io/trace"
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"golang.org/x/xerrors"
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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/blocksync"
"github.com/filecoin-project/lotus/chain/state"
"github.com/filecoin-project/lotus/chain/stmgr"
"github.com/filecoin-project/lotus/chain/store"
"github.com/filecoin-project/lotus/chain/types"
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)
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var log = logging.Logger("chain")
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type Syncer struct {
// The heaviest known tipset in the network.
// The interface for accessing and putting tipsets into local storage
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store *store.ChainStore
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// the state manager handles making state queries
sm *stmgr.StateManager
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// The known Genesis tipset
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Genesis *types.TipSet
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syncLock sync.Mutex
// TipSets known to be invalid
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bad *BadBlockCache
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// handle to the block sync service
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Bsync *blocksync.BlockSync
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self peer.ID
syncState SyncerState
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// peer heads
// Note: clear cache on disconnects
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peerHeads map[peer.ID]*types.TipSet
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peerHeadsLk sync.Mutex
}
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func NewSyncer(sm *stmgr.StateManager, bsync *blocksync.BlockSync, self peer.ID) (*Syncer, error) {
gen, err := sm.ChainStore().GetGenesis()
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if err != nil {
return nil, err
}
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gent, err := types.NewTipSet([]*types.BlockHeader{gen})
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if err != nil {
return nil, err
}
return &Syncer{
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bad: NewBadBlockCache(),
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Genesis: gent,
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Bsync: bsync,
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peerHeads: make(map[peer.ID]*types.TipSet),
store: sm.ChainStore(),
sm: sm,
self: self,
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}, nil
}
const BootstrapPeerThreshold = 1
// InformNewHead informs the syncer about a new potential tipset
// This should be called when connecting to new peers, and additionally
// when receiving new blocks from the network
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func (syncer *Syncer) InformNewHead(from peer.ID, fts *store.FullTipSet) {
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ctx := context.Background()
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if fts == nil {
panic("bad")
}
for _, b := range fts.Blocks {
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if err := syncer.ValidateMsgMeta(b); err != nil {
log.Warnf("invalid block received: %s", err)
return
}
}
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if from == syncer.self {
// TODO: this is kindof a hack...
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log.Debug("got block from ourselves")
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if err := syncer.Sync(ctx, fts.TipSet()); err != nil {
log.Errorf("failed to sync our own block %s: %+v", fts.TipSet().Cids(), err)
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}
return
}
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// TODO: IMPORTANT(GARBAGE) this needs to be put in the 'temporary' side of
// the blockstore
if err := syncer.store.PersistBlockHeaders(fts.TipSet().Blocks()...); err != nil {
log.Warn("failed to persist incoming block header: ", err)
return
}
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syncer.peerHeadsLk.Lock()
syncer.peerHeads[from] = fts.TipSet()
syncer.peerHeadsLk.Unlock()
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syncer.Bsync.AddPeer(from)
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bestPweight := syncer.store.GetHeaviestTipSet().Blocks()[0].ParentWeight
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targetWeight := fts.TipSet().Blocks()[0].ParentWeight
if targetWeight.LessThan(bestPweight) {
log.Warn("incoming tipset does not appear to be better than our best chain, ignoring for now")
return
}
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go func() {
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if err := syncer.Sync(ctx, fts.TipSet()); err != nil {
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log.Errorf("sync error (curW=%s, targetW=%s): %+v", bestPweight, targetWeight, err)
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}
}()
}
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func (syncer *Syncer) ValidateMsgMeta(fblk *types.FullBlock) error {
var bcids, scids []cbg.CBORMarshaler
for _, m := range fblk.BlsMessages {
c := cbg.CborCid(m.Cid())
bcids = append(bcids, &c)
}
for _, m := range fblk.SecpkMessages {
c := cbg.CborCid(m.Cid())
scids = append(scids, &c)
}
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// TODO: IMPORTANT(GARBAGE). These message puts and the msgmeta
// computation need to go into the 'temporary' side of the blockstore when
// we implement that
blockstore := syncer.store.Blockstore()
bs := amt.WrapBlockstore(blockstore)
smroot, err := computeMsgMeta(bs, bcids, scids)
if err != nil {
return xerrors.Errorf("validating msgmeta, compute failed: %w", err)
}
if fblk.Header.Messages != smroot {
return xerrors.Errorf("messages in full block did not match msgmeta root in header (%s != %s)", fblk.Header.Messages, smroot)
}
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for _, m := range fblk.BlsMessages {
_, err := store.PutMessage(blockstore, m)
if err != nil {
return xerrors.Errorf("putting bls message to blockstore after msgmeta computation: %w", err)
}
}
for _, m := range fblk.SecpkMessages {
_, err := store.PutMessage(blockstore, m)
if err != nil {
return xerrors.Errorf("putting bls message to blockstore after msgmeta computation: %w", err)
}
}
return nil
}
func (syncer *Syncer) LocalPeer() peer.ID {
return syncer.self
}
func (syncer *Syncer) ChainStore() *store.ChainStore {
return syncer.store
}
func (syncer *Syncer) InformNewBlock(from peer.ID, blk *types.FullBlock) {
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// TODO: search for other blocks that could form a tipset with this block
// and then send that tipset to InformNewHead
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fts := &store.FullTipSet{Blocks: []*types.FullBlock{blk}}
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syncer.InformNewHead(from, fts)
}
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func reverse(tips []*types.TipSet) []*types.TipSet {
out := make([]*types.TipSet, len(tips))
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for i := 0; i < len(tips); i++ {
out[i] = tips[len(tips)-(i+1)]
}
return out
}
func copyBlockstore(from, to bstore.Blockstore) error {
cids, err := from.AllKeysChan(context.TODO())
if err != nil {
return err
}
for c := range cids {
b, err := from.Get(c)
if err != nil {
return err
}
if err := to.Put(b); err != nil {
return err
}
}
return nil
}
// TODO: this function effectively accepts unchecked input from the network,
// either validate it here, or ensure that its validated elsewhere (maybe make
// sure the blocksync code checks it?)
// maybe this code should actually live in blocksync??
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func zipTipSetAndMessages(bs amt.Blocks, ts *types.TipSet, allbmsgs []*types.Message, allsmsgs []*types.SignedMessage, bmi, smi [][]uint64) (*store.FullTipSet, error) {
if len(ts.Blocks()) != len(smi) || len(ts.Blocks()) != len(bmi) {
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return nil, fmt.Errorf("msgincl length didnt match tipset size")
}
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fts := &store.FullTipSet{}
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for bi, b := range ts.Blocks() {
var smsgs []*types.SignedMessage
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var smsgCids []cbg.CBORMarshaler
for _, m := range smi[bi] {
smsgs = append(smsgs, allsmsgs[m])
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c := cbg.CborCid(allsmsgs[m].Cid())
smsgCids = append(smsgCids, &c)
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}
var bmsgs []*types.Message
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var bmsgCids []cbg.CBORMarshaler
for _, m := range bmi[bi] {
bmsgs = append(bmsgs, allbmsgs[m])
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c := cbg.CborCid(allbmsgs[m].Cid())
bmsgCids = append(bmsgCids, &c)
}
mrcid, err := computeMsgMeta(bs, bmsgCids, smsgCids)
if err != nil {
return nil, err
}
if b.Messages != mrcid {
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return nil, fmt.Errorf("messages didnt match message root in header")
}
fb := &types.FullBlock{
Header: b,
BlsMessages: bmsgs,
SecpkMessages: smsgs,
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}
fts.Blocks = append(fts.Blocks, fb)
}
return fts, nil
}
func computeMsgMeta(bs amt.Blocks, bmsgCids, smsgCids []cbg.CBORMarshaler) (cid.Cid, error) {
bmroot, err := amt.FromArray(bs, bmsgCids)
if err != nil {
return cid.Undef, err
}
smroot, err := amt.FromArray(bs, smsgCids)
if err != nil {
return cid.Undef, err
}
mrcid, err := bs.Put(&types.MsgMeta{
BlsMessages: bmroot,
SecpkMessages: smroot,
})
if err != nil {
return cid.Undef, xerrors.Errorf("failed to put msgmeta: %w", err)
}
return mrcid, nil
}
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func (syncer *Syncer) selectHead(ctx context.Context, heads map[peer.ID]*types.TipSet) (*types.TipSet, error) {
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var headsArr []*types.TipSet
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for _, ts := range heads {
headsArr = append(headsArr, ts)
}
sel := headsArr[0]
for i := 1; i < len(headsArr); i++ {
cur := headsArr[i]
yes, err := syncer.store.IsAncestorOf(cur, sel)
if err != nil {
return nil, err
}
if yes {
continue
}
yes, err = syncer.store.IsAncestorOf(sel, cur)
if err != nil {
return nil, err
}
if yes {
sel = cur
continue
}
nca, err := syncer.store.NearestCommonAncestor(cur, sel)
if err != nil {
return nil, err
}
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if sel.Height()-nca.Height() > build.ForkLengthThreshold {
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// TODO: handle this better than refusing to sync
return nil, fmt.Errorf("Conflict exists in heads set")
}
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curw, err := syncer.store.Weight(ctx, cur)
if err != nil {
return nil, err
}
selw, err := syncer.store.Weight(ctx, sel)
if err != nil {
return nil, err
}
if curw.GreaterThan(selw) {
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sel = cur
}
}
return sel, nil
}
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func (syncer *Syncer) FetchTipSet(ctx context.Context, p peer.ID, cids []cid.Cid) (*store.FullTipSet, error) {
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if fts, err := syncer.tryLoadFullTipSet(cids); err == nil {
return fts, nil
}
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return syncer.Bsync.GetFullTipSet(ctx, p, cids)
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}
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func (syncer *Syncer) tryLoadFullTipSet(cids []cid.Cid) (*store.FullTipSet, error) {
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ts, err := syncer.store.LoadTipSet(cids)
if err != nil {
return nil, err
}
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fts := &store.FullTipSet{}
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for _, b := range ts.Blocks() {
bmsgs, smsgs, err := syncer.store.MessagesForBlock(b)
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if err != nil {
return nil, err
}
fb := &types.FullBlock{
Header: b,
BlsMessages: bmsgs,
SecpkMessages: smsgs,
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}
fts.Blocks = append(fts.Blocks, fb)
}
return fts, nil
}
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func (syncer *Syncer) Sync(ctx context.Context, maybeHead *types.TipSet) error {
ctx, span := trace.StartSpan(ctx, "chain.Sync")
defer span.End()
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if span.IsRecordingEvents() {
span.AddAttributes(
trace.StringAttribute("tipset", fmt.Sprint(maybeHead.Cids())),
trace.Int64Attribute("height", int64(maybeHead.Height())),
)
}
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syncer.syncLock.Lock()
defer syncer.syncLock.Unlock()
if syncer.Genesis.Equals(maybeHead) || syncer.store.GetHeaviestTipSet().Equals(maybeHead) {
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return nil
}
if err := syncer.collectChain(ctx, maybeHead); err != nil {
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span.AddAttributes(trace.StringAttribute("col_error", err.Error()))
return xerrors.Errorf("collectChain failed: %w", err)
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}
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if err := syncer.store.PutTipSet(ctx, maybeHead); err != nil {
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span.AddAttributes(trace.StringAttribute("put_error", err.Error()))
return xerrors.Errorf("failed to put synced tipset to chainstore: %w", err)
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}
return nil
}
func isPermanent(err error) bool {
return !errors.Is(err, ErrTemporal)
}
func (syncer *Syncer) ValidateTipSet(ctx context.Context, fts *store.FullTipSet) error {
ctx, span := trace.StartSpan(ctx, "validateTipSet")
defer span.End()
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ts := fts.TipSet()
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if ts.Equals(syncer.Genesis) {
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return nil
}
for _, b := range fts.Blocks {
if err := syncer.ValidateBlock(ctx, b); err != nil {
if isPermanent(err) {
syncer.bad.Add(b.Cid())
}
return xerrors.Errorf("validating block %s: %w", b.Cid(), err)
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}
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if err := syncer.sm.ChainStore().AddToTipSetTracker(b.Header); err != nil {
return xerrors.Errorf("failed to add validated header to tipset tracker: %w", err)
}
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}
return nil
}
func (syncer *Syncer) minerIsValid(ctx context.Context, maddr address.Address, baseTs *types.TipSet) error {
var err error
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enc, err := actors.SerializeParams(&actors.IsValidMinerParam{Addr: maddr})
if err != nil {
return err
}
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ret, err := syncer.sm.Call(ctx, &types.Message{
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To: actors.StoragePowerAddress,
From: maddr,
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Method: actors.SPAMethods.IsValidMiner,
Params: enc,
}, baseTs)
if err != nil {
return xerrors.Errorf("checking if block miner is valid failed: %w", err)
}
if ret.ExitCode != 0 {
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return xerrors.Errorf("StorageMarket.IsValidMiner check failed (exit code %d)", ret.ExitCode)
}
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if !bytes.Equal(ret.Return, cbg.CborBoolTrue) {
return xerrors.New("miner isn't valid")
}
return nil
}
func (syncer *Syncer) validateTickets(ctx context.Context, mworker address.Address, tickets []*types.Ticket, base *types.TipSet) error {
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ctx, span := trace.StartSpan(ctx, "validateTickets")
defer span.End()
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span.AddAttributes(trace.Int64Attribute("tickets", int64(len(tickets))))
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if len(tickets) == 0 {
return xerrors.Errorf("block had no tickets")
}
cur := base.MinTicket()
for i := 0; i < len(tickets); i++ {
next := tickets[i]
sig := &types.Signature{
Type: types.KTBLS,
Data: next.VRFProof,
}
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// TODO: ticket signatures should also include miner address
if err := sig.Verify(mworker, cur.VRFProof); err != nil {
return xerrors.Errorf("invalid ticket, VRFProof invalid: %w", err)
}
cur = next
}
return nil
}
var ErrTemporal = errors.New("temporal error")
// Should match up with 'Semantical Validation' in validation.md in the spec
func (syncer *Syncer) ValidateBlock(ctx context.Context, b *types.FullBlock) error {
ctx, span := trace.StartSpan(ctx, "validateBlock")
defer span.End()
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h := b.Header
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baseTs, err := syncer.store.LoadTipSet(h.Parents)
if err != nil {
return xerrors.Errorf("load parent tipset failed (%s): %w", h.Parents, err)
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}
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// fast checks first
if h.Timestamp > uint64(time.Now().Unix()+build.AllowableClockDrift) {
return xerrors.Errorf("block was from the future")
}
if h.Timestamp < baseTs.MinTimestamp()+uint64(build.BlockDelay*len(h.Tickets)) {
log.Warn("timestamp funtimes: ", h.Timestamp, baseTs.MinTimestamp(), len(h.Tickets))
return xerrors.Errorf("block was generated too soon (h.ts:%d < base.mints:%d + BLOCK_DELAY:%d * tkts.len:%d)", h.Timestamp, baseTs.MinTimestamp(), build.BlockDelay, len(h.Tickets))
}
winnerCheck := async.Err(func() error {
mpow, tpow, err := stmgr.GetPower(ctx, syncer.sm, baseTs, h.Miner)
if err != nil {
return xerrors.Errorf("failed getting power: %w", err)
}
if !types.PowerCmp(h.ElectionProof, mpow, tpow) {
return xerrors.Errorf("miner created a block but was not a winner")
}
return nil
})
msgsCheck := async.Err(func() error {
if err := syncer.checkBlockMessages(ctx, b, baseTs); err != nil {
return xerrors.Errorf("block had invalid messages: %w", err)
}
return nil
})
minerCheck := async.Err(func() error {
if err := syncer.minerIsValid(ctx, h.Miner, baseTs); err != nil {
return xerrors.Errorf("minerIsValid failed: %w", err)
}
return nil
})
// Stuff that needs stateroot / worker address
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stateroot, precp, err := syncer.sm.TipSetState(ctx, baseTs)
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if err != nil {
return xerrors.Errorf("get tipsetstate(%d, %s) failed: %w", h.Height, h.Parents, err)
}
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if stateroot != h.ParentStateRoot {
msgs, err := syncer.store.MessagesForTipset(baseTs)
if err != nil {
log.Error("failed to load messages for tipset during tipset state mismatch error: ", err)
} else {
log.Warn("Messages for tipset with mismatching state:")
for i, m := range msgs {
mm := m.VMMessage()
log.Warnf("Message[%d]: from=%s to=%s method=%d params=%x", i, mm.From, mm.To, mm.Method, mm.Params)
}
}
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return xerrors.Errorf("parent state root did not match computed state (%s != %s)", stateroot, h.ParentStateRoot)
}
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if precp != h.ParentMessageReceipts {
return xerrors.Errorf("parent receipts root did not match computed value (%s != %s)", precp, h.ParentMessageReceipts)
}
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waddr, err := stmgr.GetMinerWorkerRaw(ctx, syncer.sm, stateroot, h.Miner)
if err != nil {
return xerrors.Errorf("GetMinerWorkerRaw failed: %w", err)
}
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blockSigCheck := async.Err(func() error {
if err := h.CheckBlockSignature(ctx, waddr); err != nil {
return xerrors.Errorf("check block signature failed: %w", err)
}
return nil
})
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tktsCheck := async.Err(func() error {
if err := syncer.validateTickets(ctx, waddr, h.Tickets, baseTs); err != nil {
return xerrors.Errorf("validating block tickets failed: %w", err)
}
return nil
})
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eproofCheck := async.Err(func() error {
rand, err := syncer.sm.ChainStore().GetRandomness(ctx, baseTs.Cids(), h.Tickets, build.EcRandomnessLookback)
if err != nil {
return xerrors.Errorf("failed to get randomness for verifying election proof: %w", err)
}
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if err := VerifyElectionProof(ctx, h.ElectionProof, rand, waddr); err != nil {
return xerrors.Errorf("checking eproof failed: %w", err)
}
return nil
})
await := []async.ErrorFuture{
minerCheck,
tktsCheck,
blockSigCheck,
eproofCheck,
winnerCheck,
msgsCheck,
}
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var merr error
for _, fut := range await {
if err := fut.AwaitContext(ctx); err != nil {
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merr = multierror.Append(merr, err)
}
}
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return merr
}
func (syncer *Syncer) checkBlockMessages(ctx context.Context, b *types.FullBlock, baseTs *types.TipSet) error {
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nonces := make(map[address.Address]uint64)
balances := make(map[address.Address]types.BigInt)
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stateroot, _, err := syncer.sm.TipSetState(ctx, baseTs)
if err != nil {
return err
}
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cst := hamt.CSTFromBstore(syncer.store.Blockstore())
st, err := state.LoadStateTree(cst, stateroot)
if err != nil {
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return xerrors.Errorf("failed to load base state tree: %w", err)
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}
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checkMsg := func(m *types.Message) error {
if m.To == address.Undef {
return xerrors.New("'To' address cannot be empty")
}
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if _, ok := nonces[m.From]; !ok {
act, err := st.GetActor(m.From)
if err != nil {
return xerrors.Errorf("failed to get actor: %w", err)
}
nonces[m.From] = act.Nonce
balances[m.From] = act.Balance
}
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if nonces[m.From] != m.Nonce {
return xerrors.Errorf("wrong nonce (exp: %d, got: %d)", nonces[m.From], m.Nonce)
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}
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nonces[m.From]++
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if balances[m.From].LessThan(m.RequiredFunds()) {
return xerrors.Errorf("not enough funds for message execution")
}
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balances[m.From] = types.BigSub(balances[m.From], m.RequiredFunds())
return nil
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}
bs := amt.WrapBlockstore(syncer.store.Blockstore())
var blsCids []cbg.CBORMarshaler
var sigCids []cid.Cid // this is what we get for people not wanting the marshalcbor method on the cid type
var pubks []bls.PublicKey
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for i, m := range b.BlsMessages {
if err := checkMsg(m); err != nil {
return xerrors.Errorf("block had invalid bls message at index %d: %w", i, err)
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}
sigCids = append(sigCids, m.Cid())
c := cbg.CborCid(m.Cid())
blsCids = append(blsCids, &c)
pubk, err := syncer.sm.GetBlsPublicKey(ctx, m.From, baseTs)
if err != nil {
return xerrors.Errorf("failed to load bls public to validate block: %w", err)
}
pubks = append(pubks, pubk)
}
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if err := syncer.verifyBlsAggregate(ctx, b.Header.BLSAggregate, sigCids, pubks); err != nil {
return xerrors.Errorf("bls aggregate signature was invalid: %w", err)
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}
var secpkCids []cbg.CBORMarshaler
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for i, m := range b.SecpkMessages {
if err := checkMsg(&m.Message); err != nil {
return xerrors.Errorf("block had invalid secpk message at index %d: %w", i, err)
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}
kaddr, err := syncer.sm.ResolveToKeyAddress(ctx, m.Message.From, baseTs)
if err != nil {
return xerrors.Errorf("failed to resolve key addr: %w", err)
}
if err := m.Signature.Verify(kaddr, m.Message.Cid().Bytes()); err != nil {
return xerrors.Errorf("secpk message %s has invalid signature: %w", m.Cid(), err)
}
c := cbg.CborCid(m.Cid())
secpkCids = append(secpkCids, &c)
}
bmroot, err := amt.FromArray(bs, blsCids)
if err != nil {
return xerrors.Errorf("failed to build amt from bls msg cids: %w", err)
}
smroot, err := amt.FromArray(bs, secpkCids)
if err != nil {
return xerrors.Errorf("failed to build amt from bls msg cids: %w", err)
}
mrcid, err := bs.Put(&types.MsgMeta{
BlsMessages: bmroot,
SecpkMessages: smroot,
})
if err != nil {
return err
}
if b.Header.Messages != mrcid {
return fmt.Errorf("messages didnt match message root in header")
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}
return nil
}
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func (syncer *Syncer) verifyBlsAggregate(ctx context.Context, sig types.Signature, msgs []cid.Cid, pubks []bls.PublicKey) error {
ctx, span := trace.StartSpan(ctx, "syncer.verifyBlsAggregate")
defer span.End()
span.AddAttributes(
trace.Int64Attribute("msgCount", int64(len(msgs))),
)
var digests []bls.Digest
for _, c := range msgs {
digests = append(digests, bls.Hash(bls.Message(c.Bytes())))
}
var bsig bls.Signature
copy(bsig[:], sig.Data)
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if !bls.Verify(&bsig, digests, pubks) {
return xerrors.New("bls aggregate signature failed to verify")
}
return nil
}
func (syncer *Syncer) collectHeaders(ctx context.Context, from *types.TipSet, to *types.TipSet) ([]*types.TipSet, error) {
ctx, span := trace.StartSpan(ctx, "collectHeaders")
defer span.End()
span.AddAttributes(
trace.Int64Attribute("fromHeight", int64(from.Height())),
trace.Int64Attribute("toHeight", int64(to.Height())),
)
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for _, pcid := range from.Parents() {
if syncer.bad.Has(pcid) {
for _, b := range from.Cids() {
syncer.bad.Add(b)
}
return nil, xerrors.Errorf("chain linked to block marked previously as bad (%s, %s)", from.Cids(), pcid)
}
}
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blockSet := []*types.TipSet{from}
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at := from.Parents()
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// we want to sync all the blocks until the height above the block we have
untilHeight := to.Height() + 1
syncer.syncState.SetHeight(blockSet[len(blockSet)-1].Height())
var acceptedBlocks []cid.Cid
loop:
for blockSet[len(blockSet)-1].Height() > untilHeight {
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for _, bc := range at {
if syncer.bad.Has(bc) {
for _, b := range acceptedBlocks {
syncer.bad.Add(b)
}
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return nil, xerrors.Errorf("chain contained block marked previously as bad (%s, %s)", from.Cids(), bc)
}
}
// If, for some reason, we have a suffix of the chain locally, handle that here
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ts, err := syncer.store.LoadTipSet(at)
if err == nil {
acceptedBlocks = append(acceptedBlocks, at...)
blockSet = append(blockSet, ts)
at = ts.Parents()
continue
}
if !xerrors.Is(err, bstore.ErrNotFound) {
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log.Warn("loading local tipset: %s", err)
}
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// NB: GetBlocks validates that the blocks are in-fact the ones we
// requested, and that they are correctly linked to eachother. It does
// not validate any state transitions
window := 500
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if gap := int(blockSet[len(blockSet)-1].Height() - untilHeight); gap < window {
window = gap
}
blks, err := syncer.Bsync.GetBlocks(ctx, at, window)
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if err != nil {
// Most likely our peers aren't fully synced yet, but forwarded
// new block message (ideally we'd find better peers)
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log.Errorf("failed to get blocks: %+v", err)
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span.AddAttributes(trace.StringAttribute("error", err.Error()))
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// This error will only be logged above,
return nil, xerrors.Errorf("failed to get blocks: %w", err)
}
log.Info("Got blocks: ", blks[0].Height(), len(blks))
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for _, b := range blks {
if b.Height() < untilHeight {
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break loop
}
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for _, bc := range b.Cids() {
if syncer.bad.Has(bc) {
for _, b := range acceptedBlocks {
syncer.bad.Add(b)
}
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return nil, xerrors.Errorf("chain contained block marked previously as bad (%s, %s)", from.Cids(), bc)
}
}
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blockSet = append(blockSet, b)
}
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acceptedBlocks = append(acceptedBlocks, at...)
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syncer.syncState.SetHeight(blks[len(blks)-1].Height())
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at = blks[len(blks)-1].Parents()
}
// We have now ascertained that this is *not* a 'fast forward'
if !types.CidArrsEqual(blockSet[len(blockSet)-1].Parents(), to.Cids()) {
last := blockSet[len(blockSet)-1]
if types.CidArrsEqual(last.Parents(), to.Parents()) {
// common case: receiving a block thats potentially part of the same tipset as our best block
return blockSet, nil
}
log.Warnf("(fork detected) synced header chain (%s - %d) does not link to our best block (%s - %d)", from.Cids(), from.Height(), to.Cids(), to.Height())
fork, err := syncer.syncFork(ctx, last, to)
if err != nil {
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if xerrors.Is(err, ErrForkTooLong) {
// TODO: we're marking this block bad in the same way that we mark invalid blocks bad. Maybe distinguish?
log.Warn("adding forked chain to our bad tipset cache")
for _, b := range from.Blocks() {
syncer.bad.Add(b.Cid())
}
}
return nil, xerrors.Errorf("failed to sync fork: %w", err)
}
blockSet = append(blockSet, fork...)
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}
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return blockSet, nil
}
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var ErrForkTooLong = fmt.Errorf("fork longer than threshold")
func (syncer *Syncer) syncFork(ctx context.Context, from *types.TipSet, to *types.TipSet) ([]*types.TipSet, error) {
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tips, err := syncer.Bsync.GetBlocks(ctx, from.Parents(), build.ForkLengthThreshold)
if err != nil {
return nil, err
}
nts, err := syncer.store.LoadTipSet(to.Parents())
if err != nil {
return nil, xerrors.Errorf("failed to load next local tipset: %w", err)
}
for cur := 0; cur < len(tips); {
if nts.Equals(tips[cur]) {
return tips[:cur+1], nil
}
if nts.Height() < tips[cur].Height() {
cur++
} else {
nts, err = syncer.store.LoadTipSet(nts.Parents())
if err != nil {
return nil, xerrors.Errorf("loading next local tipset: %w", err)
}
}
}
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return nil, ErrForkTooLong
}
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func (syncer *Syncer) syncMessagesAndCheckState(ctx context.Context, headers []*types.TipSet) error {
syncer.syncState.SetHeight(0)
return syncer.iterFullTipsets(ctx, headers, func(ctx context.Context, fts *store.FullTipSet) error {
log.Debugw("validating tipset", "height", fts.TipSet().Height(), "size", len(fts.TipSet().Cids()))
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if err := syncer.ValidateTipSet(ctx, fts); err != nil {
log.Errorf("failed to validate tipset: %+v", err)
return xerrors.Errorf("message processing failed: %w", err)
}
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syncer.syncState.SetHeight(fts.TipSet().Height())
return nil
})
}
// fills out each of the given tipsets with messages and calls the callback with it
func (syncer *Syncer) iterFullTipsets(ctx context.Context, headers []*types.TipSet, cb func(context.Context, *store.FullTipSet) error) error {
ctx, span := trace.StartSpan(ctx, "iterFullTipsets")
defer span.End()
windowSize := 200
for i := len(headers) - 1; i >= 0; {
fts, err := syncer.store.TryFillTipSet(headers[i])
if err != nil {
return err
}
if fts != nil {
if err := cb(ctx, fts); err != nil {
return err
}
i--
continue
}
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batchSize := windowSize
if i < batchSize {
batchSize = i
}
next := headers[i-batchSize]
bstips, err := syncer.Bsync.GetChainMessages(ctx, next, uint64(batchSize+1))
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if err != nil {
return xerrors.Errorf("message processing failed: %w", err)
}
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for bsi := 0; bsi < len(bstips); bsi++ {
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// temp storage so we don't persist data we dont want to
ds := dstore.NewMapDatastore()
bs := bstore.NewBlockstore(ds)
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blks := amt.WrapBlockstore(bs)
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this := headers[i-bsi]
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bstip := bstips[len(bstips)-(bsi+1)]
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fts, err := zipTipSetAndMessages(blks, this, bstip.BlsMessages, bstip.SecpkMessages, bstip.BlsMsgIncludes, bstip.SecpkMsgIncludes)
if err != nil {
log.Warnw("zipping failed", "error", err, "bsi", bsi, "i", i,
"height", this.Height(), "bstip-height", bstip.Blocks[0].Height,
"bstips", bstips, "next-height", i+batchSize)
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return xerrors.Errorf("message processing failed: %w", err)
}
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if err := cb(ctx, fts); err != nil {
return err
}
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if err := persistMessages(bs, bstip); err != nil {
return err
}
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if err := copyBlockstore(bs, syncer.store.Blockstore()); err != nil {
return xerrors.Errorf("message processing failed: %w", err)
}
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}
i -= windowSize
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}
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return nil
}
2019-07-05 14:29:17 +00:00
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func persistMessages(bs bstore.Blockstore, bst *blocksync.BSTipSet) error {
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for _, m := range bst.BlsMessages {
//log.Infof("putting BLS message: %s", m.Cid())
if _, err := store.PutMessage(bs, m); err != nil {
log.Errorf("failed to persist messages: %+v", err)
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return xerrors.Errorf("BLS message processing failed: %w", err)
}
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}
for _, m := range bst.SecpkMessages {
if m.Signature.Type != types.KTSecp256k1 {
return xerrors.Errorf("unknown signature type on message %s: %q", m.Cid(), m.Signature.TypeCode)
}
//log.Infof("putting secp256k1 message: %s", m.Cid())
if _, err := store.PutMessage(bs, m); err != nil {
log.Errorf("failed to persist messages: %+v", err)
2019-09-06 20:03:28 +00:00
return xerrors.Errorf("secp256k1 message processing failed: %w", err)
}
}
return nil
}
func (syncer *Syncer) collectChain(ctx context.Context, ts *types.TipSet) error {
ctx, span := trace.StartSpan(ctx, "collectChain")
defer span.End()
syncer.syncState.Init(syncer.store.GetHeaviestTipSet(), ts)
headers, err := syncer.collectHeaders(ctx, ts, syncer.store.GetHeaviestTipSet())
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if err != nil {
return err
}
span.AddAttributes(trace.Int64Attribute("syncChainLength", int64(len(headers))))
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if !headers[0].Equals(ts) {
log.Errorf("collectChain headers[0] should be equal to sync target. Its not: %s != %s", headers[0].Cids(), ts.Cids())
}
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syncer.syncState.SetStage(api.StagePersistHeaders)
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toPersist := make([]*types.BlockHeader, 0, len(headers)*build.BlocksPerEpoch)
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for _, ts := range headers {
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toPersist = append(toPersist, ts.Blocks()...)
}
if err := syncer.store.PersistBlockHeaders(toPersist...); err != nil {
return xerrors.Errorf("failed to persist synced blocks to the chainstore: %w", err)
2019-07-05 14:29:17 +00:00
}
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toPersist = nil
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2019-09-30 22:29:40 +00:00
syncer.syncState.SetStage(api.StageMessages)
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if err := syncer.syncMessagesAndCheckState(ctx, headers); err != nil {
return xerrors.Errorf("collectChain syncMessages: %w", err)
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}
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syncer.syncState.SetStage(api.StageSyncComplete)
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log.Debugw("new tipset", "height", ts.Height(), "tipset", types.LogCids(ts.Cids()))
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return nil
2019-07-05 14:36:08 +00:00
}
func VerifyElectionProof(ctx context.Context, eproof []byte, rand []byte, worker address.Address) error {
sig := types.Signature{
Data: eproof,
Type: types.KTBLS,
}
if err := sig.Verify(worker, rand); err != nil {
return xerrors.Errorf("failed to verify election proof signature: %w", err)
}
return nil
}
func (syncer *Syncer) State() SyncerState {
return syncer.syncState.Snapshot()
}