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snapshot.go
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snapshot.go
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package store
import (
"bytes"
"context"
"io"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
"github.com/ipld/go-car"
carutil "github.com/ipld/go-car/util"
carv2 "github.com/ipld/go-car/v2"
mh "github.com/multiformats/go-multihash"
cbg "github.com/whyrusleeping/cbor-gen"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-state-types/abi"
bstore "github.com/filecoin-project/lotus/blockstore"
"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/chain/actors/builtin"
"github.com/filecoin-project/lotus/chain/types"
)
func (cs *ChainStore) UnionStore() bstore.Blockstore {
return bstore.Union(cs.stateBlockstore, cs.chainBlockstore)
}
func (cs *ChainStore) Export(ctx context.Context, ts *types.TipSet, inclRecentRoots abi.ChainEpoch, skipOldMsgs bool, w io.Writer) error {
h := &car.CarHeader{
Roots: ts.Cids(),
Version: 1,
}
if err := car.WriteHeader(h, w); err != nil {
return xerrors.Errorf("failed to write car header: %s", err)
}
unionBs := cs.UnionStore()
return cs.WalkSnapshot(ctx, ts, inclRecentRoots, skipOldMsgs, true, func(c cid.Cid) error {
blk, err := unionBs.Get(ctx, c)
if err != nil {
return xerrors.Errorf("writing object to car, bs.Get: %w", err)
}
if err := carutil.LdWrite(w, c.Bytes(), blk.RawData()); err != nil {
return xerrors.Errorf("failed to write block to car output: %w", err)
}
return nil
})
}
func (cs *ChainStore) Import(ctx context.Context, r io.Reader) (*types.TipSet, error) {
// TODO: writing only to the state blockstore is incorrect.
// At this time, both the state and chain blockstores are backed by the
// universal store. When we physically segregate the stores, we will need
// to route state objects to the state blockstore, and chain objects to
// the chain blockstore.
br, err := carv2.NewBlockReader(r)
if err != nil {
return nil, xerrors.Errorf("loadcar failed: %w", err)
}
s := cs.StateBlockstore()
parallelPuts := 5
putThrottle := make(chan error, parallelPuts)
for i := 0; i < parallelPuts; i++ {
putThrottle <- nil
}
var buf []blocks.Block
for {
blk, err := br.Next()
if err != nil {
if err == io.EOF {
if len(buf) > 0 {
if err := s.PutMany(ctx, buf); err != nil {
return nil, err
}
}
break
}
return nil, err
}
buf = append(buf, blk)
if len(buf) > 1000 {
if lastErr := <-putThrottle; lastErr != nil { // consume one error to have the right to add one
return nil, lastErr
}
go func(buf []blocks.Block) {
putThrottle <- s.PutMany(ctx, buf)
}(buf)
buf = nil
}
}
// check errors
for i := 0; i < parallelPuts; i++ {
if lastErr := <-putThrottle; lastErr != nil {
return nil, lastErr
}
}
root, err := cs.LoadTipSet(ctx, types.NewTipSetKey(br.Roots...))
if err != nil {
return nil, xerrors.Errorf("failed to load root tipset from chainfile: %w", err)
}
return root, nil
}
func (cs *ChainStore) WalkSnapshot(ctx context.Context, ts *types.TipSet, inclRecentRoots abi.ChainEpoch, skipOldMsgs, skipMsgReceipts bool, cb func(cid.Cid) error) error {
if ts == nil {
ts = cs.GetHeaviestTipSet()
}
seen := cid.NewSet()
walked := cid.NewSet()
blocksToWalk := ts.Cids()
currentMinHeight := ts.Height()
walkChain := func(blk cid.Cid) error {
if !seen.Visit(blk) {
return nil
}
if err := cb(blk); err != nil {
return err
}
data, err := cs.chainBlockstore.Get(ctx, blk)
if err != nil {
return xerrors.Errorf("getting block: %w", err)
}
var b types.BlockHeader
if err := b.UnmarshalCBOR(bytes.NewBuffer(data.RawData())); err != nil {
return xerrors.Errorf("unmarshaling block header (cid=%s): %w", blk, err)
}
if currentMinHeight > b.Height {
currentMinHeight = b.Height
if currentMinHeight%builtin.EpochsInDay == 0 {
log.Infow("export", "height", currentMinHeight)
}
}
var cids []cid.Cid
if !skipOldMsgs || b.Height > ts.Height()-inclRecentRoots {
if walked.Visit(b.Messages) {
mcids, err := recurseLinks(ctx, cs.chainBlockstore, walked, b.Messages, []cid.Cid{b.Messages})
if err != nil {
return xerrors.Errorf("recursing messages failed: %w", err)
}
cids = mcids
}
}
if b.Height > 0 {
for _, p := range b.Parents {
blocksToWalk = append(blocksToWalk, p)
}
} else {
// include the genesis block
cids = append(cids, b.Parents...)
}
out := cids
if b.Height == 0 || b.Height > ts.Height()-inclRecentRoots {
if walked.Visit(b.ParentStateRoot) {
cids, err := recurseLinks(ctx, cs.stateBlockstore, walked, b.ParentStateRoot, []cid.Cid{b.ParentStateRoot})
if err != nil {
return xerrors.Errorf("recursing genesis state failed: %w", err)
}
out = append(out, cids...)
}
if !skipMsgReceipts && walked.Visit(b.ParentMessageReceipts) {
out = append(out, b.ParentMessageReceipts)
}
}
for _, c := range out {
if seen.Visit(c) {
prefix := c.Prefix()
// Don't include identity CIDs.
if prefix.MhType == mh.IDENTITY {
continue
}
// We only include raw and dagcbor, for now.
// Raw for "code" CIDs.
switch prefix.Codec {
case cid.Raw, cid.DagCBOR:
default:
continue
}
if err := cb(c); err != nil {
return err
}
}
}
return nil
}
log.Infow("export started")
exportStart := build.Clock.Now()
for len(blocksToWalk) > 0 {
next := blocksToWalk[0]
blocksToWalk = blocksToWalk[1:]
if err := walkChain(next); err != nil {
return xerrors.Errorf("walk chain failed: %w", err)
}
}
log.Infow("export finished", "duration", build.Clock.Now().Sub(exportStart).Seconds())
return nil
}
func recurseLinks(ctx context.Context, bs bstore.Blockstore, walked *cid.Set, root cid.Cid, in []cid.Cid) ([]cid.Cid, error) {
if root.Prefix().Codec != cid.DagCBOR {
return in, nil
}
data, err := bs.Get(ctx, root)
if err != nil {
return nil, xerrors.Errorf("recurse links get (%s) failed: %w", root, err)
}
var rerr error
err = cbg.ScanForLinks(bytes.NewReader(data.RawData()), func(c cid.Cid) {
if rerr != nil {
// No error return on ScanForLinks :(
return
}
// traversed this already...
if !walked.Visit(c) {
return
}
in = append(in, c)
var err error
in, err = recurseLinks(ctx, bs, walked, c, in)
if err != nil {
rerr = err
}
})
if err != nil {
return nil, xerrors.Errorf("scanning for links failed: %w", err)
}
return in, rerr
}