// openDatastore returns an error if the config file is not present.
func (r *FSRepo) openDatastore() error {
leveldbPath := path.Join(r.path, leveldbDirectory)
var err error
// save leveldb reference so it can be neatly closed afterward
leveldbDS, err := levelds.NewDatastore(leveldbPath, &levelds.Options{
Compression: ldbopts.NoCompression,
})
if err != nil {
return errors.New("unable to open leveldb datastore")
}
// 4TB of 256kB objects ~=17M objects, splitting that 256-way
// leads to ~66k objects per dir, splitting 256*256-way leads to
// only 256.
//
// The keys seen by the block store have predictable prefixes,
// including "/" from datastore.Key and 2 bytes from multihash. To
// reach a uniform 256-way split, we need approximately 4 bytes of
// prefix.
blocksDS, err := flatfs.New(path.Join(r.path, flatfsDirectory), 4)
if err != nil {
return errors.New("unable to open flatfs datastore")
}
// Add our PeerID to metrics paths to keep them unique
//
// As some tests just pass a zero-value Config to fsrepo.Init,
// cope with missing PeerID.
id := r.config.Identity.PeerID
if id == "" {
// the tests pass in a zero Config; cope with it
id = fmt.Sprintf("uninitialized_%p", r)
}
prefix := "fsrepo." + id + ".datastore."
metricsBlocks := measure.New(prefix+"blocks", blocksDS)
metricsLevelDB := measure.New(prefix+"leveldb", leveldbDS)
mountDS := mount.New([]mount.Mount{
{
Prefix: ds.NewKey("/blocks"),
Datastore: metricsBlocks,
},
{
Prefix: ds.NewKey("/"),
Datastore: metricsLevelDB,
},
})
// Make sure it's ok to claim the virtual datastore from mount as
// threadsafe. There's no clean way to make mount itself provide
// this information without copy-pasting the code into two
// variants. This is the same dilemma as the `[].byte` attempt at
// introducing const types to Go.
var _ ds.ThreadSafeDatastore = blocksDS
var _ ds.ThreadSafeDatastore = leveldbDS
r.ds = ds2.ClaimThreadSafe{mountDS}
return nil
}
func (d *Datastore) lookup(key ds.Key) (ds.Datastore, ds.Key, ds.Key) {
d.lk.Lock()
defer d.lk.Unlock()
for _, m := range d.mounts {
if m.Prefix.Equal(key) || m.Prefix.IsAncestorOf(key) {
s := strings.TrimPrefix(key.String(), m.Prefix.String())
k := ds.NewKey(s)
return m.Datastore, m.Prefix, k
}
}
return nil, ds.NewKey("/"), key
}
// Query implements Datastore.Query
func (d *Datastore) Query(q query.Query) (query.Results, error) {
results := make(chan query.Result)
walkFn := func(path string, info os.FileInfo, err error) error {
// remove ds path prefix
if strings.HasPrefix(path, d.path) {
path = path[len(d.path):]
}
if !info.IsDir() {
if strings.HasSuffix(path, ObjectKeySuffix) {
path = path[:len(path)-len(ObjectKeySuffix)]
}
key := ds.NewKey(path)
entry := query.Entry{Key: key.String(), Value: query.NotFetched}
results <- query.Result{Entry: entry}
}
return nil
}
go func() {
filepath.Walk(d.path, walkFn)
close(results)
}()
r := query.ResultsWithChan(q, results)
r = query.NaiveQueryApply(q, r)
return r, nil
}
// Query implements Query, inverting keys on the way back out.
func (d *datastore) Query(q dsq.Query) (dsq.Results, error) {
qr, err := d.raw.Query(q)
if err != nil {
return nil, err
}
ch := make(chan dsq.Result)
go func() {
defer close(ch)
defer qr.Close()
for r := range qr.Next() {
if r.Error != nil {
ch <- r
continue
}
k := ds.NewKey(r.Entry.Key)
if !d.prefix.IsAncestorOf(k) {
continue
}
r.Entry.Key = d.Datastore.InvertKey(k).String()
ch <- r
}
}()
return dsq.DerivedResults(qr, ch), nil
}
// ConvertKey returns a B58 encoded Datastore key
// TODO: this is hacky because it encodes every path component. some
// path components may be proper strings already...
func (b58KeyConverter) ConvertKey(dsk ds.Key) ds.Key {
k := ds.NewKey("/")
for _, n := range dsk.Namespaces() {
k = k.ChildString(b58.Encode([]byte(n)))
}
return k
}
func (mt *mountBatch) lookupBatch(key ds.Key) (ds.Batch, ds.Key, error) {
mt.lk.Lock()
defer mt.lk.Unlock()
child, loc, rest := mt.d.lookup(key)
t, ok := mt.mounts[loc.String()]
if !ok {
bds, ok := child.(ds.Batching)
if !ok {
return nil, ds.NewKey(""), ds.ErrBatchUnsupported
}
var err error
t, err = bds.Batch()
if err != nil {
return nil, ds.NewKey(""), err
}
mt.mounts[loc.String()] = t
}
return t, rest, nil
}
func RunBatchTest(t *testing.T, ds dstore.Batching) {
batch, err := ds.Batch()
if err != nil {
t.Fatal(err)
}
r := rand.New()
var blocks [][]byte
var keys []dstore.Key
for i := 0; i < 20; i++ {
blk := make([]byte, 256*1024)
r.Read(blk)
blocks = append(blocks, blk)
key := dstore.NewKey(base32.StdEncoding.EncodeToString(blk[:8]))
keys = append(keys, key)
err := batch.Put(key, blk)
if err != nil {
t.Fatal(err)
}
}
// Ensure they are not in the datastore before comitting
for _, k := range keys {
_, err := ds.Get(k)
if err == nil {
t.Fatal("should not have found this block")
}
}
// commit, write them to the datastore
err = batch.Commit()
if err != nil {
t.Fatal(err)
}
for i, k := range keys {
blk, err := ds.Get(k)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(blk.([]byte), blocks[i]) {
t.Fatal("blocks not correct!")
}
}
}
func (d *datastore) runQuery(worker goprocess.Process, qrb *dsq.ResultBuilder) {
var rnge *util.Range
if qrb.Query.Prefix != "" {
rnge = util.BytesPrefix([]byte(qrb.Query.Prefix))
}
i := d.DB.NewIterator(rnge, nil)
defer i.Release()
// advance iterator for offset
if qrb.Query.Offset > 0 {
for j := 0; j < qrb.Query.Offset; j++ {
i.Next()
}
}
// iterate, and handle limit, too
for sent := 0; i.Next(); sent++ {
// end early if we hit the limit
if qrb.Query.Limit > 0 && sent >= qrb.Query.Limit {
break
}
k := ds.NewKey(string(i.Key())).String()
e := dsq.Entry{Key: k}
if !qrb.Query.KeysOnly {
buf := make([]byte, len(i.Value()))
copy(buf, i.Value())
e.Value = buf
}
select {
case qrb.Output <- dsq.Result{Entry: e}: // we sent it out
case <-worker.Closing(): // client told us to end early.
break
}
}
if err := i.Error(); err != nil {
select {
case qrb.Output <- dsq.Result{Error: err}: // client read our error
case <-worker.Closing(): // client told us to end.
return
}
}
}
// PrefixTransform constructs a KeyTransform with a pair of functions that
// add or remove the given prefix key.
//
// Warning: will panic if prefix not found when it should be there. This is
// to avoid insidious data inconsistency errors.
func PrefixTransform(prefix ds.Key) ktds.KeyTransform {
return &ktds.Pair{
// Convert adds the prefix
Convert: func(k ds.Key) ds.Key {
return prefix.Child(k)
},
// Invert removes the prefix. panics if prefix not found.
Invert: func(k ds.Key) ds.Key {
if !prefix.IsAncestorOf(k) {
fmt.Errorf("Expected prefix (%s) in key (%s)", prefix, k)
panic("expected prefix not found")
}
s := strings.TrimPrefix(k.String(), prefix.String())
return ds.NewKey(s)
},
}
}
// Query implements Query, inverting keys on the way back out.
func (d *ktds) Query(q dsq.Query) (dsq.Results, error) {
qr, err := d.child.Query(q)
if err != nil {
return nil, err
}
ch := make(chan dsq.Result)
go func() {
defer close(ch)
defer qr.Close()
for r := range qr.Next() {
if r.Error == nil {
r.Entry.Key = d.InvertKey(ds.NewKey(r.Entry.Key)).String()
}
ch <- r
}
}()
return dsq.DerivedResults(qr, ch), nil
}
func RunBatchDeleteTest(t *testing.T, ds dstore.Batching) {
r := rand.New()
var keys []dstore.Key
for i := 0; i < 20; i++ {
blk := make([]byte, 16)
r.Read(blk)
key := dstore.NewKey(base32.StdEncoding.EncodeToString(blk[:8]))
keys = append(keys, key)
err := ds.Put(key, blk)
if err != nil {
t.Fatal(err)
}
}
batch, err := ds.Batch()
if err != nil {
t.Fatal(err)
}
for _, k := range keys {
err := batch.Delete(k)
if err != nil {
t.Fatal(err)
}
}
err = batch.Commit()
if err != nil {
t.Fatal(err)
}
for _, k := range keys {
_, err := ds.Get(k)
if err == nil {
t.Fatal("shouldnt have found block")
}
}
}
func (d *Datastore) Query(q query.Query) (query.Results, error) {
if len(q.Filters) > 0 ||
len(q.Orders) > 0 ||
q.Limit > 0 ||
q.Offset > 0 {
// TODO this is overly simplistic, but the only caller is
// `ipfs refs local` for now, and this gets us moving.
return nil, errors.New("mount only supports listing all prefixed keys in random order")
}
key := ds.NewKey(q.Prefix)
cds, mount, k := d.lookup(key)
if cds == nil {
return nil, errors.New("mount only supports listing a mount point")
}
// TODO support listing cross mount points too
// delegate the query to the mounted datastore, while adjusting
// keys in and out
q2 := q
q2.Prefix = k.String()
wrapDS := keytransform.Wrap(cds, &keytransform.Pair{
Convert: func(ds.Key) ds.Key {
panic("this should never be called")
},
Invert: func(k ds.Key) ds.Key {
return mount.Child(k)
},
})
r, err := wrapDS.Query(q2)
if err != nil {
return nil, err
}
r = query.ResultsReplaceQuery(r, q)
return r, nil
}
