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fsrefstore.go
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/
fsrefstore.go
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package filestore
import (
"context"
"fmt"
"io"
"os"
"path/filepath"
"github.com/ipfs/go-ipfs/blocks"
"github.com/ipfs/go-ipfs/blocks/blockstore"
pb "github.com/ipfs/go-ipfs/filestore/pb"
dshelp "github.com/ipfs/go-ipfs/thirdparty/ds-help"
posinfo "github.com/ipfs/go-ipfs/thirdparty/posinfo"
ds "gx/ipfs/QmRWDav6mzWseLWeYfVd5fvUKiVe9xNH29YfMF438fG364/go-datastore"
dsns "gx/ipfs/QmRWDav6mzWseLWeYfVd5fvUKiVe9xNH29YfMF438fG364/go-datastore/namespace"
dsq "gx/ipfs/QmRWDav6mzWseLWeYfVd5fvUKiVe9xNH29YfMF438fG364/go-datastore/query"
proto "gx/ipfs/QmT6n4mspWYEya864BhCUJEgyxiRfmiSY9ruQwTUNpRKaM/protobuf/proto"
cid "gx/ipfs/QmV5gPoRsjN1Gid3LMdNZTyfCtP2DsvqEbMAmz82RmmiGk/go-cid"
)
var FilestorePrefix = ds.NewKey("filestore")
type FileManager struct {
ds ds.Batching
root string
}
type CorruptReferenceError struct {
Err error
}
func (c CorruptReferenceError) Error() string {
return c.Err.Error()
}
func NewFileManager(ds ds.Batching, root string) *FileManager {
return &FileManager{dsns.Wrap(ds, FilestorePrefix), root}
}
func (f *FileManager) AllKeysChan(ctx context.Context) (<-chan *cid.Cid, error) {
q := dsq.Query{KeysOnly: true}
q.Prefix = FilestorePrefix.String()
res, err := f.ds.Query(q)
if err != nil {
return nil, err
}
out := make(chan *cid.Cid, dsq.KeysOnlyBufSize)
go func() {
defer close(out)
for {
v, ok := res.NextSync()
if !ok {
return
}
k := ds.RawKey(v.Key)
c, err := dshelp.DsKeyToCid(k)
if err != nil {
log.Error("decoding cid from filestore: %s", err)
continue
}
select {
case out <- c:
case <-ctx.Done():
return
}
}
}()
return out, nil
}
func (f *FileManager) DeleteBlock(c *cid.Cid) error {
err := f.ds.Delete(dshelp.CidToDsKey(c))
if err == ds.ErrNotFound {
return blockstore.ErrNotFound
}
return err
}
func (f *FileManager) Get(c *cid.Cid) (blocks.Block, error) {
dobj, err := f.getDataObj(c)
if err != nil {
return nil, err
}
out, err := f.readDataObj(c, dobj)
if err != nil {
return nil, err
}
return blocks.NewBlockWithCid(out, c)
}
func (f *FileManager) getDataObj(c *cid.Cid) (*pb.DataObj, error) {
o, err := f.ds.Get(dshelp.CidToDsKey(c))
switch err {
case ds.ErrNotFound:
return nil, blockstore.ErrNotFound
default:
return nil, err
case nil:
//
}
data, ok := o.([]byte)
if !ok {
return nil, fmt.Errorf("stored filestore dataobj was not a []byte")
}
var dobj pb.DataObj
if err := proto.Unmarshal(data, &dobj); err != nil {
return nil, err
}
return &dobj, nil
}
// reads and verifies the block
func (f *FileManager) readDataObj(c *cid.Cid, d *pb.DataObj) ([]byte, error) {
p := filepath.FromSlash(d.GetFilePath())
abspath := filepath.Join(f.root, p)
fi, err := os.Open(abspath)
if err != nil {
return nil, &CorruptReferenceError{err}
}
defer fi.Close()
_, err = fi.Seek(int64(d.GetOffset()), os.SEEK_SET)
if err != nil {
return nil, &CorruptReferenceError{err}
}
outbuf := make([]byte, d.GetSize_())
_, err = io.ReadFull(fi, outbuf)
if err != nil {
return nil, &CorruptReferenceError{err}
}
outcid, err := c.Prefix().Sum(outbuf)
if err != nil {
return nil, err
}
if !c.Equals(outcid) {
return nil, &CorruptReferenceError{fmt.Errorf("data in file did not match. %s offset %d", d.GetFilePath(), d.GetOffset())}
}
return outbuf, nil
}
func (f *FileManager) Has(c *cid.Cid) (bool, error) {
// NOTE: interesting thing to consider. Has doesnt validate the data.
// So the data on disk could be invalid, and we could think we have it.
dsk := dshelp.CidToDsKey(c)
return f.ds.Has(dsk)
}
type putter interface {
Put(ds.Key, interface{}) error
}
func (f *FileManager) Put(b *posinfo.FilestoreNode) error {
return f.putTo(b, f.ds)
}
func (f *FileManager) putTo(b *posinfo.FilestoreNode, to putter) error {
var dobj pb.DataObj
if !filepath.HasPrefix(b.PosInfo.FullPath, f.root) {
return fmt.Errorf("cannot add filestore references outside ipfs root")
}
p, err := filepath.Rel(f.root, b.PosInfo.FullPath)
if err != nil {
return err
}
dobj.FilePath = proto.String(filepath.ToSlash(p))
dobj.Offset = proto.Uint64(b.PosInfo.Offset)
dobj.Size_ = proto.Uint64(uint64(len(b.RawData())))
data, err := proto.Marshal(&dobj)
if err != nil {
return err
}
return to.Put(dshelp.CidToDsKey(b.Cid()), data)
}
func (f *FileManager) PutMany(bs []*posinfo.FilestoreNode) error {
batch, err := f.ds.Batch()
if err != nil {
return err
}
for _, b := range bs {
if err := f.putTo(b, batch); err != nil {
return err
}
}
return batch.Commit()
}