| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package logs |
| 4 | |
| 5 | import ( |
| 6 | "bufio" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "io" |
| 10 | "strconv" |
| 11 | "unsafe" |
| 12 | |
| 13 | "github.com/Wing924/ltsv" |
| 14 | ) |
| 15 | |
| 16 | type ( |
| 17 | LTSVConfig struct { |
| 18 | FieldDelimiter string `yaml:"field_delimiter" json:"field_delimiter"` |
| 19 | ValueDelimiter string `yaml:"value_delimiter" json:"value_delimiter"` |
| 20 | Mapping map[string]string `yaml:"mapping" json:"mapping"` |
| 21 | } |
| 22 | |
| 23 | LTSVParser struct { |
| 24 | r *bufio.Reader |
| 25 | parser ltsv.Parser |
| 26 | mapping map[string]string |
| 27 | } |
| 28 | ) |
| 29 | |
| 30 | func NewLTSVParser(config LTSVConfig, in io.Reader) (*LTSVParser, error) { |
| 31 | p := ltsv.Parser{ |
| 32 | FieldDelimiter: ltsv.DefaultParser.FieldDelimiter, |
| 33 | ValueDelimiter: ltsv.DefaultParser.ValueDelimiter, |
| 34 | StrictMode: false, |
| 35 | } |
| 36 | if config.FieldDelimiter != "" { |
| 37 | if d, err := parseLTSVDelimiter(config.FieldDelimiter); err == nil { |
| 38 | p.FieldDelimiter = d |
| 39 | } |
| 40 | } |
| 41 | if config.ValueDelimiter != "" { |
| 42 | if d, err := parseLTSVDelimiter(config.ValueDelimiter); err == nil { |
| 43 | p.ValueDelimiter = d |
| 44 | } |
| 45 | } |
| 46 | parser := <SVParser{ |
| 47 | r: bufio.NewReader(in), |
| 48 | parser: p, |
| 49 | mapping: config.Mapping, |
| 50 | } |
| 51 | return parser, nil |
| 52 | } |
| 53 | |
| 54 | func (p *LTSVParser) ReadLine(line LogLine) error { |
| 55 | row, err := p.r.ReadSlice('\n') |
| 56 | if err != nil && len(row) == 0 { |
| 57 | return err |
| 58 | } |
| 59 | if len(row) > 0 && row[len(row)-1] == '\n' { |
| 60 | row = row[:len(row)-1] |
| 61 | } |
| 62 | return p.Parse(row, line) |
| 63 | } |
| 64 | |
| 65 | func (p *LTSVParser) Parse(row []byte, line LogLine) error { |
| 66 | err := p.parser.ParseLine(row, func(label []byte, value []byte) error { |
| 67 | s := *(*string)(unsafe.Pointer(&label)) // no alloc, same as in fmt.Builder.String() |
| 68 | if v, ok := p.mapping[s]; ok { |
| 69 | s = v |
| 70 | } |
| 71 | return line.Assign(s, string(value)) |
| 72 | }) |
| 73 | if err != nil { |
| 74 | return &ParseError{msg: fmt.Sprintf("ltsv parse: %v", err), err: err} |
| 75 | } |
| 76 | return nil |
| 77 | } |
| 78 | |
| 79 | func (p LTSVParser) Info() string { |
| 80 | return fmt.Sprintf("ltsv: %q", p.mapping) |
| 81 | } |
| 82 | |
| 83 | func parseLTSVDelimiter(s string) (byte, error) { |
| 84 | if isNumber(s) { |
| 85 | d, err := strconv.ParseUint(s, 10, 8) |
| 86 | if err != nil { |
| 87 | return 0, fmt.Errorf("invalid LTSV delimiter: %v", err) |
| 88 | } |
| 89 | return byte(d), nil |
| 90 | } |
| 91 | if len(s) != 1 { |
| 92 | return 0, errors.New("invalid LTSV delimiter: must be a single character") |
| 93 | } |
| 94 | return s[0], nil |
| 95 | } |