func openDefaultDatastore(r *FSRepo) (repo.Datastore, error) {
leveldbPath := path.Join(r.path, leveldbDirectory)
// save leveldb reference so it can be neatly closed afterward
leveldbDS, err := levelds.NewDatastore(leveldbPath, &levelds.Options{
Compression: ldbopts.NoCompression,
})
if err != nil {
return nil, fmt.Errorf("unable to open leveldb datastore: %v", err)
}
// 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.
syncfs := !r.config.Datastore.NoSync
blocksDS, err := flatfs.New(path.Join(r.path, flatfsDirectory), 4, syncfs)
if err != nil {
return nil, fmt.Errorf("unable to open flatfs datastore: %v", err)
}
// 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,
},
})
return mountDS, nil
}
// openDatastore returns an error if the config file is not present.
func (r *FSRepo) openDatastore() error {
switch r.config.Datastore.Type {
case "default", "leveldb", "":
d, err := openDefaultDatastore(r)
if err != nil {
return err
}
r.ds = d
default:
return fmt.Errorf("unknown datastore type: %s", r.config.Datastore.Type)
}
// Wrap it with metrics gathering
//
// 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"
r.ds = measure.New(prefix, r.ds)
return nil
}