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| 1 | +package fstree |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "errors" |
| 6 | + "fmt" |
| 7 | + "io" |
| 8 | + "io/fs" |
| 9 | + "os" |
| 10 | + |
| 11 | + "github.com/klauspost/compress/zstd" |
| 12 | + "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/util/logicerr" |
| 13 | + apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status" |
| 14 | + objectSDK "github.com/nspcc-dev/neofs-sdk-go/object" |
| 15 | + oid "github.com/nspcc-dev/neofs-sdk-go/object/id" |
| 16 | + "github.com/nspcc-dev/neofs-sdk-go/proto/object" |
| 17 | + "github.com/nspcc-dev/neofs-sdk-go/proto/refs" |
| 18 | + "google.golang.org/protobuf/encoding/protowire" |
| 19 | + "google.golang.org/protobuf/proto" |
| 20 | +) |
| 21 | + |
| 22 | +const ( |
| 23 | + _ = iota |
| 24 | + fieldObjectID |
| 25 | + fieldObjectSignature |
| 26 | + fieldObjectHeader |
| 27 | + fieldObjectPayload |
| 28 | +) |
| 29 | + |
| 30 | +// Head returns an object's header from the storage by address without reading the full payload. |
| 31 | +func (t *FSTree) Head(addr oid.Address) (*objectSDK.Object, error) { |
| 32 | + p := t.treePath(addr) |
| 33 | + |
| 34 | + f, err := os.Open(p) |
| 35 | + if err != nil { |
| 36 | + if errors.Is(err, fs.ErrNotExist) { |
| 37 | + return nil, logicerr.Wrap(apistatus.ErrObjectNotFound) |
| 38 | + } |
| 39 | + return nil, fmt.Errorf("read file %q: %w", p, err) |
| 40 | + } |
| 41 | + defer f.Close() |
| 42 | + |
| 43 | + obj, err := t.extractHeaderOnly(addr.Object(), f) |
| 44 | + if err != nil { |
| 45 | + if errors.Is(err, fs.ErrNotExist) { |
| 46 | + return nil, logicerr.Wrap(apistatus.ErrObjectNotFound) |
| 47 | + } |
| 48 | + return nil, fmt.Errorf("extract object header from %q: %w", p, err) |
| 49 | + } |
| 50 | + |
| 51 | + return obj, nil |
| 52 | +} |
| 53 | + |
| 54 | +// extractHeaderOnly reads the header of an object from a file. |
| 55 | +func (t *FSTree) extractHeaderOnly(id oid.ID, f *os.File) (*objectSDK.Object, error) { |
| 56 | + buf := make([]byte, objectSDK.MaxHeaderLen, 2*objectSDK.MaxHeaderLen) |
| 57 | + n, err := io.ReadFull(f, buf) |
| 58 | + if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrUnexpectedEOF) { |
| 59 | + return nil, err |
| 60 | + } |
| 61 | + |
| 62 | + thisOID, l := parseCombinedPrefix(buf) |
| 63 | + if thisOID == nil { |
| 64 | + return t.readHeader(f, buf[:n]) |
| 65 | + } |
| 66 | + |
| 67 | + offset := combinedDataOff |
| 68 | + for { |
| 69 | + if bytes.Equal(thisOID, id[:]) { |
| 70 | + size := min(offset+int(l), offset+objectSDK.MaxHeaderLen) |
| 71 | + if n < size { |
| 72 | + _, err = io.ReadFull(f, buf[n:size]) |
| 73 | + if err != nil { |
| 74 | + return nil, fmt.Errorf("read up to size: %w", err) |
| 75 | + } |
| 76 | + } |
| 77 | + return t.readHeader(f, buf[offset:size]) |
| 78 | + } |
| 79 | + |
| 80 | + offset += int(l) |
| 81 | + if n-offset < combinedDataOff { |
| 82 | + if offset > n { |
| 83 | + _, err = f.Seek(int64(offset-n), io.SeekCurrent) |
| 84 | + if err != nil { |
| 85 | + return nil, err |
| 86 | + } |
| 87 | + } |
| 88 | + n = copy(buf, buf[min(offset, n):n]) |
| 89 | + offset = 0 |
| 90 | + k, err := io.ReadFull(f, buf[n:n+objectSDK.MaxHeaderLen]) |
| 91 | + if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrUnexpectedEOF) { |
| 92 | + return nil, fmt.Errorf("read full: %w", err) |
| 93 | + } |
| 94 | + n += k |
| 95 | + } |
| 96 | + |
| 97 | + thisOID, l = parseCombinedPrefix(buf[offset:]) |
| 98 | + if thisOID == nil { |
| 99 | + return nil, errors.New("malformed combined file") |
| 100 | + } |
| 101 | + |
| 102 | + offset += combinedDataOff |
| 103 | + } |
| 104 | +} |
| 105 | + |
| 106 | +// readHeader reads an object from the file. |
| 107 | +func (t *FSTree) readHeader(f io.Reader, initial []byte) (*objectSDK.Object, error) { |
| 108 | + var err error |
| 109 | + if len(initial) < objectSDK.MaxHeaderLen { |
| 110 | + initial, err = t.Decompress(initial) |
| 111 | + if err != nil { |
| 112 | + return nil, fmt.Errorf("decompress initial data: %w", err) |
| 113 | + } |
| 114 | + var obj objectSDK.Object |
| 115 | + err = obj.Unmarshal(initial) |
| 116 | + if err != nil { |
| 117 | + return nil, fmt.Errorf("unmarshal object: %w", err) |
| 118 | + } |
| 119 | + return obj.CutPayload(), nil |
| 120 | + } |
| 121 | + return t.readUntilPayload(f, initial) |
| 122 | +} |
| 123 | + |
| 124 | +// readUntilPayload reads an object from the file until the payload field is reached. |
| 125 | +func (t *FSTree) readUntilPayload(f io.Reader, initial []byte) (*objectSDK.Object, error) { |
| 126 | + if t.IsCompressed(initial) { |
| 127 | + decoder, err := zstd.NewReader(io.MultiReader(bytes.NewReader(initial), f)) |
| 128 | + if err != nil { |
| 129 | + return nil, fmt.Errorf("zstd decoder: %w", err) |
| 130 | + } |
| 131 | + defer decoder.Close() |
| 132 | + |
| 133 | + buf := make([]byte, objectSDK.MaxHeaderLen) |
| 134 | + n, err := decoder.Read(buf) |
| 135 | + if err != nil && !errors.Is(err, io.EOF) { |
| 136 | + return nil, fmt.Errorf("zstd read: %w", err) |
| 137 | + } |
| 138 | + initial = buf[:n] |
| 139 | + } |
| 140 | + |
| 141 | + return fastExtractHeader(initial) |
| 142 | +} |
| 143 | + |
| 144 | +// fastExtractHeader extracts the header of an object from the given byte slice. |
| 145 | +func fastExtractHeader(data []byte) (*objectSDK.Object, error) { |
| 146 | + var ( |
| 147 | + offset int |
| 148 | + res objectSDK.Object |
| 149 | + obj object.Object |
| 150 | + ) |
| 151 | + |
| 152 | + if len(data) == 0 { |
| 153 | + return nil, fmt.Errorf("empty data") |
| 154 | + } |
| 155 | + |
| 156 | + for offset < len(data) { |
| 157 | + num, typ, n := protowire.ConsumeTag(data[offset:]) |
| 158 | + if err := protowire.ParseError(n); err != nil { |
| 159 | + return nil, fmt.Errorf("invalid tag at offset %d: %w", offset, err) |
| 160 | + } |
| 161 | + offset += n |
| 162 | + |
| 163 | + if typ != protowire.BytesType { |
| 164 | + return nil, fmt.Errorf("unexpected wire type: %v", typ) |
| 165 | + } |
| 166 | + |
| 167 | + if num == fieldObjectPayload { |
| 168 | + break |
| 169 | + } |
| 170 | + |
| 171 | + val, n := protowire.ConsumeBytes(data[offset:]) |
| 172 | + if err := protowire.ParseError(n); err != nil { |
| 173 | + return nil, fmt.Errorf("invalid bytes field at offset %d: %w", offset, err) |
| 174 | + } |
| 175 | + offset += n |
| 176 | + |
| 177 | + switch num { |
| 178 | + case fieldObjectID: |
| 179 | + obj.ObjectId = new(refs.ObjectID) |
| 180 | + err := proto.Unmarshal(val, obj.ObjectId) |
| 181 | + if err != nil { |
| 182 | + return nil, fmt.Errorf("unmarshal object ID: %w", err) |
| 183 | + } |
| 184 | + case fieldObjectSignature: |
| 185 | + obj.Signature = new(refs.Signature) |
| 186 | + err := proto.Unmarshal(val, obj.Signature) |
| 187 | + if err != nil { |
| 188 | + return nil, fmt.Errorf("unmarshal object signature: %w", err) |
| 189 | + } |
| 190 | + case fieldObjectHeader: |
| 191 | + obj.Header = new(object.Header) |
| 192 | + err := proto.Unmarshal(val, obj.Header) |
| 193 | + if err != nil { |
| 194 | + return nil, fmt.Errorf("unmarshal object header: %w", err) |
| 195 | + } |
| 196 | + return &res, res.FromProtoMessage(&obj) |
| 197 | + default: |
| 198 | + return nil, fmt.Errorf("unknown field number: %d", num) |
| 199 | + } |
| 200 | + } |
| 201 | + |
| 202 | + return &res, res.FromProtoMessage(&obj) |
| 203 | +} |
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