144 lines
3.9 KiB
Go
144 lines
3.9 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
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// See LICENSE for copying information.
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package kvmetainfo
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import (
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"context"
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"errors"
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"github.com/gogo/protobuf/proto"
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"storj.io/storj/pkg/encryption"
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"storj.io/storj/pkg/pb"
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"storj.io/storj/pkg/storj"
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)
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var _ storj.ReadOnlyStream = (*readonlyStream)(nil)
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type readonlyStream struct {
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db *DB
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info storj.Object
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encryptedPath storj.Path
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streamKey *storj.Key // lazySegmentReader derivedKey
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}
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func (stream *readonlyStream) Info() storj.Object { return stream.info }
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func (stream *readonlyStream) SegmentsAt(ctx context.Context, byteOffset int64, limit int64) (infos []storj.Segment, more bool, err error) {
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defer mon.Task()(&ctx)(&err)
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if stream.info.FixedSegmentSize <= 0 {
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return nil, false, errors.New("not implemented")
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}
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index := byteOffset / stream.info.FixedSegmentSize
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return stream.Segments(ctx, index, limit)
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}
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func (stream *readonlyStream) segment(ctx context.Context, index int64) (segment storj.Segment, err error) {
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defer mon.Task()(&ctx)(&err)
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segment = storj.Segment{
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Index: index,
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}
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var segmentPath storj.Path
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isLastSegment := segment.Index+1 == stream.info.SegmentCount
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if !isLastSegment {
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segmentPath = getSegmentPath(stream.encryptedPath, index)
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_, meta, err := stream.db.segments.Get(ctx, segmentPath)
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if err != nil {
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return segment, err
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}
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segmentMeta := pb.SegmentMeta{}
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err = proto.Unmarshal(meta.Data, &segmentMeta)
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if err != nil {
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return segment, err
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}
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segment.Size = stream.info.FixedSegmentSize
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copy(segment.EncryptedKeyNonce[:], segmentMeta.KeyNonce)
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segment.EncryptedKey = segmentMeta.EncryptedKey
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} else {
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segmentPath = storj.JoinPaths("l", stream.encryptedPath)
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segment.Size = stream.info.LastSegment.Size
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segment.EncryptedKeyNonce = stream.info.LastSegment.EncryptedKeyNonce
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segment.EncryptedKey = stream.info.LastSegment.EncryptedKey
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}
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contentKey, err := encryption.DecryptKey(segment.EncryptedKey, stream.Info().EncryptionScheme.Cipher, stream.streamKey, &segment.EncryptedKeyNonce)
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if err != nil {
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return segment, err
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}
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nonce := new(storj.Nonce)
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_, err = encryption.Increment(nonce, index+1)
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if err != nil {
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return segment, err
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}
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pointer, _, _, err := stream.db.pointers.Get(ctx, segmentPath)
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if err != nil {
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return segment, err
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}
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if pointer.GetType() == pb.Pointer_INLINE {
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segment.Inline, err = encryption.Decrypt(pointer.InlineSegment, stream.info.EncryptionScheme.Cipher, contentKey, nonce)
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} else {
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segment.PieceID = storj.PieceID(pointer.Remote.PieceId)
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segment.Pieces = make([]storj.Piece, 0, len(pointer.Remote.RemotePieces))
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for _, piece := range pointer.Remote.RemotePieces {
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var nodeID storj.NodeID
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copy(nodeID[:], piece.NodeId.Bytes())
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segment.Pieces = append(segment.Pieces, storj.Piece{Number: byte(piece.PieceNum), Location: nodeID})
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}
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}
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return segment, nil
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}
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func (stream *readonlyStream) Segments(ctx context.Context, index int64, limit int64) (infos []storj.Segment, more bool, err error) {
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defer mon.Task()(&ctx)(&err)
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if index < 0 {
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return nil, false, errors.New("invalid argument")
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}
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if limit <= 0 {
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limit = defaultSegmentLimit
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}
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if index >= stream.info.SegmentCount {
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return nil, false, nil
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}
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infos = make([]storj.Segment, 0, limit)
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for ; index < stream.info.SegmentCount && limit > 0; index++ {
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limit--
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segment, err := stream.segment(ctx, index)
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if err != nil {
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return nil, false, err
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}
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infos = append(infos, segment)
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}
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more = index < stream.info.SegmentCount
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return infos, more, nil
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}
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type mutableStream struct {
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db *DB
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info storj.Object
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}
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func (stream *mutableStream) Info() storj.Object { return stream.info }
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func (stream *mutableStream) AddSegments(ctx context.Context, segments ...storj.Segment) error {
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return errors.New("not implemented")
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}
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func (stream *mutableStream) UpdateSegments(ctx context.Context, segments ...storj.Segment) error {
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return errors.New("not implemented")
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}
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