7eedb23eb7
Dump contains magic and a list of objects prefixed by object size in bytes. We can't use proto-marshaled list because this requires having all dump in memory. Using TAR induces 512 byte overhead for each object which can be a problem in some cases. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
115 lines
2.2 KiB
Go
115 lines
2.2 KiB
Go
package shard
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"io"
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"os"
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"github.com/nspcc-dev/neofs-node/pkg/core/object"
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)
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// ErrInvalidMagic is returned when dump format is invalid.
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var ErrInvalidMagic = errors.New("invalid magic")
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// RestorePrm groups the parameters of Restore operation.
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type RestorePrm struct {
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path string
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stream io.Reader
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}
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// WithPath is a Restore option to set the destination path.
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func (p *RestorePrm) WithPath(path string) *RestorePrm {
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p.path = path
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return p
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}
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// WithStream is a Restore option to set the stream to read objects from.
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// It takes priority over `WithPath` option.
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func (p *RestorePrm) WithStream(r io.Reader) *RestorePrm {
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p.stream = r
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return p
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}
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// RestoreRes groups the result fields of Restore operation.
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type RestoreRes struct {
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count int
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}
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// Count return amount of object written.
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func (r *RestoreRes) Count() int {
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return r.count
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}
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// Restore restores objects from the dump prepared by Evacuate.
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//
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// Returns any error encountered.
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func (s *Shard) Restore(prm *RestorePrm) (*RestoreRes, error) {
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// Disallow changing mode during restore.
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s.m.RLock()
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defer s.m.RUnlock()
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if s.info.Mode != ModeReadWrite {
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return nil, ErrReadOnlyMode
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}
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r := prm.stream
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if r == nil {
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f, err := os.OpenFile(prm.path, os.O_RDONLY, os.ModeExclusive)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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r = f
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}
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var m [4]byte
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_, _ = io.ReadFull(r, m[:])
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if !bytes.Equal(m[:], dumpMagic) {
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return nil, ErrInvalidMagic
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}
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var count int
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var data []byte
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var size [4]byte
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for {
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// If there are less than 4 bytes left, `Read` returns nil error instead of
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// io.ErrUnexpectedEOF, thus `ReadFull` is used.
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_, err := io.ReadFull(r, size[:])
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if err != nil {
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if errors.Is(err, io.EOF) {
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break
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}
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return nil, err
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}
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sz := binary.LittleEndian.Uint32(size[:])
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if uint32(cap(data)) < sz {
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data = make([]byte, sz)
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} else {
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data = data[:sz]
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}
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_, err = r.Read(data)
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if err != nil {
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return nil, err
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}
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obj := object.New()
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err = obj.Unmarshal(data)
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if err != nil {
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return nil, err
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}
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_, err = s.Put(new(PutPrm).WithObject(obj))
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if err != nil {
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return nil, err
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}
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count++
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}
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return &RestoreRes{count: count}, nil
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}
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