lotus/node/repo/fsrepo_ds.go

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package repo
import (
"os"
"path/filepath"
"github.com/ipfs/go-datastore"
"github.com/ipfs/go-datastore/mount"
"github.com/ipfs/go-datastore/namespace"
"golang.org/x/xerrors"
dgbadger "github.com/dgraph-io/badger/v2"
badger "github.com/ipfs/go-ds-badger2"
levelds "github.com/ipfs/go-ds-leveldb"
measure "github.com/ipfs/go-ds-measure"
ldbopts "github.com/syndtr/goleveldb/leveldb/opt"
)
var fsDatastores = map[string]func(path string) (datastore.Batching, error){
"chain": badgerDs,
"metadata": levelDs,
// Those need to be fast for large writes... but also need a really good GC :c
"staging": badgerDs, // miner specific
"client": badgerDs, // client specific
}
func badgerDs(path string) (datastore.Batching, error) {
opts := badger.DefaultOptions
opts.Options = dgbadger.DefaultOptions("").WithTruncate(true).
WithValueThreshold(1 << 10)
return badger.NewDatastore(path, &opts)
}
func levelDs(path string) (datastore.Batching, error) {
return levelds.NewDatastore(path, &levelds.Options{
Compression: ldbopts.NoCompression,
})
}
func (fsr *fsLockedRepo) openDatastore() (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
for p, ctor := range fsDatastores {
prefix := datastore.NewKey(p)
// TODO: optimization: don't init datastores we don't need
ds, err := ctor(fsr.join(filepath.Join(fsDatastore, p)))
if err != nil {
return nil, xerrors.Errorf("opening datastore %s: %w", prefix, err)
}
ds = measure.New("fsrepo."+p, ds)
mounts = append(mounts, mount.Mount{
Prefix: prefix,
Datastore: ds,
})
}
return mount.New(mounts), nil
}
func (fsr *fsLockedRepo) Datastore(ns string) (datastore.Batching, error) {
fsr.dsOnce.Do(func() {
fsr.ds, fsr.dsErr = fsr.openDatastore()
})
if fsr.dsErr != nil {
return nil, fsr.dsErr
}
return namespace.Wrap(fsr.ds, datastore.NewKey(ns)), nil
}