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// SPDX-License-Identifier: GPL-3.0-or-later
package logs
import (
"bufio"
"errors"
"fmt"
"io"
"regexp"
)
type (
RegExpConfig struct {
Pattern string `yaml:"pattern" json:"pattern"`
}
RegExpParser struct {
r *bufio.Reader
pattern *regexp.Regexp
}
)
func NewRegExpParser(config RegExpConfig, in io.Reader) (*RegExpParser, error) {
if config.Pattern == "" {
return nil, errors.New("empty pattern")
}
pattern, err := regexp.Compile(config.Pattern)
if err != nil {
return nil, fmt.Errorf("compile: %w", err)
}
if pattern.NumSubexp() == 0 {
return nil, errors.New("pattern has no named subgroups")
}
p := &RegExpParser{
r: bufio.NewReader(in),
pattern: pattern,
}
return p, nil
}
func (p *RegExpParser) ReadLine(line LogLine) error {
row, err := p.r.ReadSlice('\n')
if err != nil && len(row) == 0 {
return err
}
if len(row) > 0 && row[len(row)-1] == '\n' {
row = row[:len(row)-1]
}
return p.Parse(row, line)
}
func (p *RegExpParser) Parse(row []byte, line LogLine) error {
match := p.pattern.FindSubmatch(row)
if len(match) == 0 {
return &ParseError{msg: "regexp parse: unmatched line"}
}
for i, name := range p.pattern.SubexpNames() {
if name == "" || match[i] == nil {
continue
}
err := line.Assign(name, string(match[i]))
if err != nil {
return &ParseError{msg: fmt.Sprintf("regexp parse: %v", err), err: err}
}
}
return nil
}
func (p RegExpParser) Info() string {
return fmt.Sprintf("regexp: %s", p.pattern)
}
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