fsrepo: multi-datastores

node/repo/fsrepo.go

@@ -225,9 +225,11 @@ type fsLockedRepo struct {
 	repoType RepoType
 	closer   io.Closer
 
-	ds     datastore.Batching
+	ds      map[string]datastore.Batching
+	multiDs map[string]map[int64]datastore.Batching
 	dsErr   error
 	dsOnce  sync.Once
+	dsLk    sync.Mutex
 
 	storageLk sync.Mutex
 	configLk  sync.Mutex
@@ -244,10 +246,12 @@ func (fsr *fsLockedRepo) Close() error {
 		return xerrors.Errorf("could not remove API file: %w", err)
 	}
 	if fsr.ds != nil {
-		if err := fsr.ds.Close(); err != nil {
+		for _, ds := range fsr.ds {
+			if err := ds.Close(); err != nil {
 				return xerrors.Errorf("could not close datastore: %w", err)
 			}
 		}
+	}
 
 	err = fsr.closer.Close()
 	fsr.closer = nil

node/repo/fsrepo_ds.go

@@ -1,12 +1,13 @@
 package repo
 
 import (
+	"fmt"
 	"github.com/ipfs/go-datastore"
-	"github.com/ipfs/go-datastore/mount"
-	"github.com/ipfs/go-datastore/namespace"
 	"golang.org/x/xerrors"
+	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strconv"
 
 	badger "github.com/ipfs/go-ds-badger2"
 	levelds "github.com/ipfs/go-ds-leveldb"
@@ -14,12 +15,17 @@ import (
 	ldbopts "github.com/syndtr/goleveldb/leveldb/opt"
 )
 
-var fsDatastores = map[string]func(path string) (datastore.Batching, error){
+type dsCtor func(path string) (datastore.Batching, error)
+
+var fsDatastores = map[string]dsCtor{
 	"chain":    badgerDs,
 	"metadata": levelDs,
 
 	// Those need to be fast for large writes... but also need a really good GC :c
 	"staging": badgerDs, // miner specific
+}
+
+var fsMultiDatastores = map[string]dsCtor{
 	"client": badgerDs, // client specific
 }
 
@@ -36,12 +42,12 @@ func levelDs(path string) (datastore.Batching, error) {
 	})
 }
 
-func (fsr *fsLockedRepo) openDatastore() (datastore.Batching, error) {
+func (fsr *fsLockedRepo) openDatastores() (map[string]datastore.Batching, error) {
 	if err := os.MkdirAll(fsr.join(fsDatastore), 0755); err != nil {
 		return nil, xerrors.Errorf("mkdir %s: %w", fsr.join(fsDatastore), err)
 	}
 
-	var mounts []mount.Mount
+	out := map[string]datastore.Batching{}
 
 	for p, ctor := range fsDatastores {
 		prefix := datastore.NewKey(p)
@@ -54,21 +60,159 @@ func (fsr *fsLockedRepo) openDatastore() (datastore.Batching, error) {
 
 		ds = measure.New("fsrepo."+p, ds)
 
-		mounts = append(mounts, mount.Mount{
-			Prefix:    prefix,
-			Datastore: ds,
-		})
+		out[datastore.NewKey(p).String()] = ds
 	}
 
-	return mount.New(mounts), nil
+	return out, nil
+}
+
+func (fsr *fsLockedRepo) openMultiDatastores() (map[string]map[int64]datastore.Batching, error) {
+	out := map[string]map[int64]datastore.Batching{}
+
+	for p, ctor := range fsMultiDatastores {
+		path := fsr.join(filepath.Join(fsDatastore, p))
+		if err := os.MkdirAll(path, 0755); err != nil {
+			return nil, xerrors.Errorf("mkdir %s: %w", path, err)
+		}
+
+		di, err := ioutil.ReadDir(path)
+		if err != nil {
+			return nil, xerrors.Errorf("readdir '%s': %w", path, err)
+		}
+
+		out[p] = map[int64]datastore.Batching{}
+
+		for _, info := range di {
+			path = filepath.Join(path, info.Name())
+
+			prefix := datastore.NewKey(p)
+
+			id, err := strconv.ParseInt(info.Name(), 10, 64)
+			if err != nil {
+				log.Errorf("error parsing multi-datastore id for '%s': %w", path, err)
+				continue
+			}
+
+			// TODO: optimization: don't init datastores we don't need
+			ds, err := ctor(path)
+			if err != nil {
+				return nil, xerrors.Errorf("opening datastore %s: %w", prefix, err)
+			}
+
+			ds = measure.New("fsrepo."+p+"."+info.Name(), ds)
+
+			out[p][id] = ds
+		}
+	}
+
+	return out, nil
+}
+
+func (fsr *fsLockedRepo) openMultiDatastore(ns string, idx int64) (datastore.Batching, error) {
+	ctor, ok := fsMultiDatastores[ns]
+	if !ok {
+		return nil, xerrors.Errorf("no multi-datastore with namespace '%s'", ns)
+	}
+
+	si := fmt.Sprintf("%d", idx)
+	path := fsr.join(filepath.Join(fsDatastore, ns, si))
+
+	ds, err := ctor(path)
+	if err != nil {
+		return nil, xerrors.Errorf("opening datastore %s: %w", path, err)
+	}
+
+	ds = measure.New("fsrepo."+ns+"."+si, ds)
+
+	return ds, nil
 }
 
 func (fsr *fsLockedRepo) Datastore(ns string) (datastore.Batching, error) {
 	fsr.dsOnce.Do(func() {
-		fsr.ds, fsr.dsErr = fsr.openDatastore()
+		var err error
+		fsr.ds, err = fsr.openDatastores()
+		if err != nil {
+			fsr.dsErr = err
+			return
+		}
+
+		fsr.multiDs, fsr.dsErr = fsr.openMultiDatastores()
 	})
 	if fsr.dsErr != nil {
 		return nil, fsr.dsErr
 	}
-	return namespace.Wrap(fsr.ds, datastore.NewKey(ns)), nil
+	ds, ok := fsr.ds[ns]
+	if ok {
+		return ds, nil
+	}
+
+	k := datastore.NewKey(ns)
+	parts := k.List()
+	if len(parts) != 2 {
+		return nil, xerrors.Errorf("expected multi-datastore namespace to have 2 parts")
+	}
+
+	fsr.dsLk.Lock()
+	defer fsr.dsLk.Unlock()
+
+	mds, ok := fsr.multiDs[parts[0]]
+	if !ok {
+		return nil, xerrors.Errorf("no multi-datastore with namespace %s", ns)
+	}
+
+	idx, err := strconv.ParseInt(parts[1], 10, 64)
+	if err != nil {
+		return nil, xerrors.Errorf("parsing mult-datastore index('%s'): %w", parts[1], err)
+	}
+
+	ds, ok = mds[idx]
+	if !ok {
+		ds, err = fsr.openMultiDatastore(parts[0], idx)
+		if err != nil {
+			return nil, xerrors.Errorf("opening multi-datastore: %w", err)
+		}
+
+		mds[idx] = ds
+	}
+
+	return ds, nil
+}
+
+func (fsr *fsLockedRepo) DeleteDatastore(ns string) error {
+	k := datastore.NewKey(ns)
+	parts := k.List()
+	if len(parts) != 2 {
+		return xerrors.Errorf("expected multi-datastore namespace to have 2 parts")
+	}
+
+	mds, ok := fsr.multiDs[parts[0]]
+	if !ok {
+		return xerrors.Errorf("no multi-datastore with namespace %s", ns)
+	}
+
+	idx, err := strconv.ParseInt(parts[1], 10, 64)
+	if err != nil {
+		return xerrors.Errorf("parsing mult-datastore index('%s'): %w", parts[1], err)
+	}
+
+	fsr.dsLk.Lock()
+	defer fsr.dsLk.Unlock()
+
+	ds, ok := mds[idx]
+	if !ok {
+		return xerrors.Errorf("no multi-datastore with at index (namespace %s)", ns)
+	}
+
+	if err := ds.Close(); err != nil {
+		return xerrors.Errorf("closing datastore: %w", err)
+	}
+
+	path := fsr.join(filepath.Join(fsDatastore, parts[0], parts[1]))
+
+	log.Warnw("removing sub-datastore", "path", path, "namespace", ns)
+	if err := os.RemoveAll(path); err != nil {
+		return xerrors.Errorf("remove '%s': %w", path, err)
+	}
+
+	return nil
 }

node/repo/interface.go

@@ -35,6 +35,7 @@ type LockedRepo interface {
 
 	// Returns datastore defined in this repo.
 	Datastore(namespace string) (datastore.Batching, error)
+	DeleteDatastore(namespace string) error
 
 	// Returns config in this repo
 	Config() (interface{}, error)

node/repo/memrepo.go

@@ -233,6 +233,11 @@ func (lmem *lockedMemRepo) Datastore(ns string) (datastore.Batching, error) {
 	return namespace.Wrap(lmem.mem.datastore, datastore.NewKey(ns)), nil
 }
 
+func (lmem *lockedMemRepo) DeleteDatastore(ns string) error {
+	/** poof **/
+	return nil
+}
+
 func (lmem *lockedMemRepo) Config() (interface{}, error) {
 	if err := lmem.checkToken(); err != nil {
 		return nil, err