package fstree import ( "crypto/sha256" "errors" "fmt" "io/fs" "os" "path/filepath" "strings" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/common" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/compression" "github.com/nspcc-dev/neofs-node/pkg/util" apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status" cid "github.com/nspcc-dev/neofs-sdk-go/container/id" objectSDK "github.com/nspcc-dev/neofs-sdk-go/object" oid "github.com/nspcc-dev/neofs-sdk-go/object/id" ) // FSTree represents an object storage as a filesystem tree. type FSTree struct { Info *compression.Config Depth int DirNameLen int } // Info groups the information about file storage. type Info struct { // Permission bits of the root directory. Permissions fs.FileMode // Full path to the root directory. RootPath string } const ( // DirNameLen is how many bytes is used to group keys into directories. DirNameLen = 1 // in bytes // MaxDepth is maximum depth of nested directories. MaxDepth = (sha256.Size - 1) / DirNameLen ) var _ common.Storage = (*FSTree)(nil) func New(opts ...Option) *FSTree { f := &FSTree{ Info: Info{ Permissions: 0700, RootPath: "./", }, Config: nil, Depth: 4, DirNameLen: DirNameLen, } for i := range opts { opts[i](f) } return f } func stringifyAddress(addr oid.Address) string { return addr.Object().EncodeToString() + "." + addr.Container().EncodeToString() } func addressFromString(s string) (*oid.Address, error) { ss := strings.SplitN(s, ".", 2) if len(ss) != 2 { return nil, errors.New("invalid address") } var obj oid.ID if err := obj.DecodeString(ss[0]); err != nil { return nil, err } var cnr cid.ID if err := cnr.DecodeString(ss[1]); err != nil { return nil, err } var addr oid.Address addr.SetObject(obj) addr.SetContainer(cnr) return &addr, nil } // Iterate iterates over all stored objects. func (t *FSTree) Iterate(prm common.IteratePrm) (common.IterateRes, error) { return common.IterateRes{}, t.iterate(0, []string{t.RootPath}, prm) } func (t *FSTree) iterate(depth int, curPath []string, prm common.IteratePrm) error { curName := strings.Join(curPath[1:], "") des, err := os.ReadDir(filepath.Join(curPath...)) if err != nil { if prm.IgnoreErrors { return nil } return err } isLast := depth >= t.Depth l := len(curPath) curPath = append(curPath, "") for i := range des { curPath[l] = des[i].Name() if !isLast && des[i].IsDir() { err := t.iterate(depth+1, curPath, prm) if err != nil { // Must be error from handler in case errors are ignored. // Need to report. return err } } if depth != t.Depth { continue } addr, err := addressFromString(curName + des[i].Name()) if err != nil { continue } if prm.LazyHandler != nil { err = prm.LazyHandler(*addr, func() ([]byte, error) { return os.ReadFile(filepath.Join(curPath...)) }) } else { var data []byte data, err = os.ReadFile(filepath.Join(curPath...)) if err == nil { data, err = t.Decompress(data) } if err != nil { if prm.IgnoreErrors { if prm.ErrorHandler != nil { return prm.ErrorHandler(*addr, err) } continue } return err } err = prm.Handler(common.IterationElement{ Address: *addr, ObjectData: data, StorageID: []byte{}, }) } if err != nil { return err } } return nil } func (t *FSTree) treePath(addr oid.Address) string { sAddr := stringifyAddress(addr) dirs := make([]string, 0, t.Depth+1+1) // 1 for root, 1 for file dirs = append(dirs, t.RootPath) for i := 0; i < t.Depth; i++ { dirs = append(dirs, sAddr[:t.DirNameLen]) sAddr = sAddr[t.DirNameLen:] } dirs = append(dirs, sAddr) return filepath.Join(dirs...) } // Delete removes the object with the specified address from the storage. func (t *FSTree) Delete(prm common.DeletePrm) (common.DeleteRes, error) { p, err := t.getPath(prm.Address) if err != nil { if os.IsNotExist(err) { var errNotFound apistatus.ObjectNotFound err = errNotFound } return common.DeleteRes{}, err } return common.DeleteRes{}, os.Remove(p) } // Exists returns the path to the file with object contents if it exists in the storage // and an error otherwise. func (t *FSTree) Exists(prm common.ExistsPrm) (common.ExistsRes, error) { _, err := t.getPath(prm.Address) found := err == nil if os.IsNotExist(err) { err = nil } return common.ExistsRes{Exists: found}, err } func (t *FSTree) getPath(addr oid.Address) (string, error) { p := t.treePath(addr) _, err := os.Stat(p) return p, err } // Put puts an object in the storage. func (t *FSTree) Put(prm common.PutPrm) (common.PutRes, error) { p := t.treePath(prm.Address) if err := util.MkdirAllX(filepath.Dir(p), t.Permissions); err != nil { return common.PutRes{}, err } if !prm.DontCompress { prm.RawData = t.Compress(prm.RawData) } return common.PutRes{StorageID: []byte{}}, os.WriteFile(p, prm.RawData, t.Permissions) } // PutStream puts executes handler on a file opened for write. func (t *FSTree) PutStream(addr oid.Address, handler func(*os.File) error) error { p := t.treePath(addr) if err := util.MkdirAllX(filepath.Dir(p), t.Permissions); err != nil { return err } f, err := os.OpenFile(p, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, t.Permissions) if err != nil { return err } defer f.Close() return handler(f) } // Get returns an object from the storage by address. func (t *FSTree) Get(prm common.GetPrm) (common.GetRes, error) { p := t.treePath(prm.Address) if _, err := os.Stat(p); os.IsNotExist(err) { var errNotFound apistatus.ObjectNotFound return common.GetRes{}, errNotFound } data, err := os.ReadFile(p) if err != nil { return common.GetRes{}, err } data, err = t.Decompress(data) if err != nil { return common.GetRes{}, err } obj := objectSDK.New() if err := obj.Unmarshal(data); err != nil { return common.GetRes{}, err } return common.GetRes{Object: obj, RawData: data}, err } // GetRange implements common.Storage. func (t *FSTree) GetRange(prm common.GetRangePrm) (common.GetRangeRes, error) { res, err := t.Get(common.GetPrm{Address: prm.Address}) if err != nil { return common.GetRangeRes{}, err } payload := res.Object.Payload() from := prm.Range.GetOffset() to := from + prm.Range.GetLength() if pLen := uint64(len(payload)); to < from || pLen < from || pLen < to { return common.GetRangeRes{}, apistatus.ObjectOutOfRange{} } return common.GetRangeRes{ Data: payload[from:to], }, nil } // NumberOfObjects walks the file tree rooted at FSTree's root // and returns number of stored objects. func (t *FSTree) NumberOfObjects() (uint64, error) { var counter uint64 // it is simpler to just consider every file // that is not directory as an object err := filepath.WalkDir(t.RootPath, func(_ string, d fs.DirEntry, _ error) error { if !d.IsDir() { counter++ } return nil }, ) if err != nil { return 0, fmt.Errorf("could not walk through %s directory: %w", t.RootPath, err) } return counter, nil } // Type implements common.Storage. func (*FSTree) Type() string { return "fstree" } // SetCompressor implements common.Storage. func (t *FSTree) SetCompressor(cc *compression.Config) { t.Config = cc }