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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| package splitstore | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "io" | ||
| "os" | ||
|
|
||
| "golang.org/x/xerrors" | ||
|
|
||
| cid "github.com/ipfs/go-cid" | ||
| mh "github.com/multiformats/go-multihash" | ||
| ) | ||
|
|
||
| type Checkpoint struct { | ||
| file *os.File | ||
| buf *bufio.Writer | ||
| } | ||
|
|
||
| func NewCheckpoint(path string) (*Checkpoint, error) { | ||
| file, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY|os.O_SYNC, 0644) | ||
| if err != nil { | ||
| return nil, xerrors.Errorf("error creating checkpoint: %w", err) | ||
| } | ||
| buf := bufio.NewWriter(file) | ||
|
|
||
| return &Checkpoint{ | ||
| file: file, | ||
| buf: buf, | ||
| }, nil | ||
| } | ||
|
|
||
| func OpenCheckpoint(path string) (*Checkpoint, cid.Cid, error) { | ||
| filein, err := os.Open(path) | ||
| if err != nil { | ||
| return nil, cid.Undef, xerrors.Errorf("error opening checkpoint for reading: %w", err) | ||
| } | ||
| defer filein.Close() //nolint:errcheck | ||
|
|
||
| bufin := bufio.NewReader(filein) | ||
| start, err := readRawCid(bufin, nil) | ||
| if err != nil && err != io.EOF { | ||
| return nil, cid.Undef, xerrors.Errorf("error reading cid from checkpoint: %w", err) | ||
| } | ||
|
|
||
| fileout, err := os.OpenFile(path, os.O_WRONLY|os.O_SYNC, 0644) | ||
| if err != nil { | ||
| return nil, cid.Undef, xerrors.Errorf("error opening checkpoint for writing: %w", err) | ||
| } | ||
| bufout := bufio.NewWriter(fileout) | ||
|
|
||
| return &Checkpoint{ | ||
| file: fileout, | ||
| buf: bufout, | ||
| }, start, nil | ||
| } | ||
|
|
||
| func (cp *Checkpoint) Set(c cid.Cid) error { | ||
| if _, err := cp.file.Seek(0, io.SeekStart); err != nil { | ||
| return xerrors.Errorf("error seeking beginning of checkpoint: %w", err) | ||
| } | ||
|
|
||
| if err := writeRawCid(cp.buf, c, true); err != nil { | ||
| return xerrors.Errorf("error writing cid to checkpoint: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (cp *Checkpoint) Close() error { | ||
| if cp.file == nil { | ||
| return nil | ||
| } | ||
|
|
||
| err := cp.file.Close() | ||
| cp.file = nil | ||
| cp.buf = nil | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| func readRawCid(buf *bufio.Reader, hbuf []byte) (cid.Cid, error) { | ||
| sz, err := buf.ReadByte() | ||
| if err != nil { | ||
| return cid.Undef, err // don't wrap EOF as it is not an error here | ||
| } | ||
|
|
||
| if hbuf == nil { | ||
| hbuf = make([]byte, int(sz)) | ||
| } else { | ||
| hbuf = hbuf[:int(sz)] | ||
| } | ||
|
|
||
| if _, err := io.ReadFull(buf, hbuf); err != nil { | ||
| return cid.Undef, xerrors.Errorf("error reading hash: %w", err) // wrap EOF, it's corrupt | ||
| } | ||
|
|
||
| hash, err := mh.Cast(hbuf) | ||
| if err != nil { | ||
| return cid.Undef, xerrors.Errorf("error casting multihash: %w", err) | ||
| } | ||
|
|
||
| return cid.NewCidV1(cid.Raw, hash), nil | ||
| } | ||
|
|
||
| func writeRawCid(buf *bufio.Writer, c cid.Cid, flush bool) error { | ||
| hash := c.Hash() | ||
| if err := buf.WriteByte(byte(len(hash))); err != nil { | ||
| return err | ||
| } | ||
| if _, err := buf.Write(hash); err != nil { | ||
| return err | ||
| } | ||
| if flush { | ||
| return buf.Flush() | ||
| } | ||
|
|
||
| return nil | ||
| } |
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