| 31 | } |
| 32 | |
| 33 | func NewReader(sctx *super.Context, r io.Reader, opts ReaderOpts) (sio.ReadCloser, error) { |
| 34 | if opts.Format != "" && opts.Format != "auto" { |
| 35 | return lookupReader(sctx, r, opts) |
| 36 | } |
| 37 | |
| 38 | var parquetErr, csupErr error |
| 39 | if rs, ok := r.(io.ReadSeeker); ok { |
| 40 | if n, err := rs.Seek(0, io.SeekCurrent); err == nil { |
| 41 | var rc sio.ReadCloser |
| 42 | rc, parquetErr = parquetio.NewReader(sctx, rs, opts.Fields) |
| 43 | if parquetErr == nil { |
| 44 | return rc, nil |
| 45 | } |
| 46 | if _, err := rs.Seek(n, io.SeekStart); err != nil { |
| 47 | return nil, err |
| 48 | } |
| 49 | var zr sio.Reader |
| 50 | zr, csupErr = csupio.NewReader(sctx, rs, opts.Fields) |
| 51 | if csupErr == nil { |
| 52 | return sio.NopReadCloser(zr), nil |
| 53 | } |
| 54 | if _, err := rs.Seek(n, io.SeekStart); err != nil { |
| 55 | return nil, err |
| 56 | } |
| 57 | } else { |
| 58 | parquetErr = err |
| 59 | csupErr = err |
| 60 | } |
| 61 | parquetErr = fmt.Errorf("parquet: %w", parquetErr) |
| 62 | csupErr = fmt.Errorf("csup: %w", csupErr) |
| 63 | } else { |
| 64 | parquetErr = errors.New("parquet: auto-detection requires seekable input") |
| 65 | csupErr = errors.New("csup: auto-detection requires seekable input") |
| 66 | } |
| 67 | |
| 68 | track := NewTrack(r) |
| 69 | |
| 70 | arrowsErr := isArrowStream(track) |
| 71 | if arrowsErr == nil { |
| 72 | return arrowio.NewReader(sctx, track.Reader()) |
| 73 | } |
| 74 | arrowsErr = fmt.Errorf("arrows: %w", arrowsErr) |
| 75 | track.Reset() |
| 76 | |
| 77 | zeekErr := match(zeekio.NewReader(super.NewContext(), track), "zeek", 1) |
| 78 | if zeekErr == nil { |
| 79 | return sio.NopReadCloser(zeekio.NewReader(sctx, track.Reader())), nil |
| 80 | } |
| 81 | track.Reset() |
| 82 | |
| 83 | // JSUP must come before JSON and SUP since it is a subset of both. |
| 84 | jsupErr := match(jsupio.NewReader(super.NewContext(), track), "jsup", 1) |
| 85 | if jsupErr == nil { |
| 86 | return sio.NopReadCloser(jsupio.NewReader(sctx, track.Reader())), nil |
| 87 | } |
| 88 | track.Reset() |
| 89 | |
| 90 | // JSON comes before SUP because the JSON reader is faster than the |