frostfs-node/pkg/local_object_storage/blobstor/fstree/fstree.go

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package fstree
import (
"crypto/sha256"
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"strings"
"syscall"
"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 uint64
DirNameLen int
readOnly bool
}
// 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 uint64, 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; uint64(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) {
if t.readOnly {
return common.DeleteRes{}, common.ErrReadOnly
}
p, err := t.getPath(prm.Address)
if err != nil {
if os.IsNotExist(err) {
var errNotFound apistatus.ObjectNotFound
err = errNotFound
}
return common.DeleteRes{}, err
}
err = os.Remove(p)
if err != nil && os.IsNotExist(err) {
err = apistatus.ObjectNotFound{}
}
return common.DeleteRes{}, err
}
// 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) {
if t.readOnly {
return common.PutRes{}, common.ErrReadOnly
}
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)
}
err := os.WriteFile(p, prm.RawData, t.Permissions)
if err != nil {
var pe *fs.PathError
if errors.As(err, &pe) && pe.Err == syscall.ENOSPC {
err = common.ErrNoSpace
}
}
return common.PutRes{StorageID: []byte{}}, err
}
// PutStream puts executes handler on a file opened for write.
func (t *FSTree) PutStream(addr oid.Address, handler func(*os.File) error) error {
if t.readOnly {
return common.ErrReadOnly
}
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 is fstree storage type used in logs and configuration.
const Type = "fstree"
// Type implements common.Storage.
func (*FSTree) Type() string {
return Type
}
// SetCompressor implements common.Storage.
func (t *FSTree) SetCompressor(cc *compression.Config) {
t.Config = cc
}