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// SPDX-License-Identifier: GPL-3.0-or-later
package logs
import (
"bufio"
"fmt"
"io"
"strconv"
"github.com/valyala/fastjson"
)
type JSONConfig struct {
Mapping map[string]string `yaml:"mapping" json:"mapping"`
}
type JSONParser struct {
reader *bufio.Reader
parser fastjson.Parser
buf []byte
mapping map[string]string
}
func NewJSONParser(config JSONConfig, in io.Reader) (*JSONParser, error) {
parser := &JSONParser{
reader: bufio.NewReader(in),
mapping: config.Mapping,
buf: make([]byte, 0, 100),
}
return parser, nil
}
func (p *JSONParser) ReadLine(line LogLine) error {
row, err := p.reader.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 *JSONParser) Parse(row []byte, line LogLine) error {
val, err := p.parser.ParseBytes(row)
if err != nil {
return err
}
if err := p.parseObject("", val, line); err != nil {
return &ParseError{msg: fmt.Sprintf("json parse: %v", err), err: err}
}
return nil
}
func (p *JSONParser) parseObject(prefix string, val *fastjson.Value, line LogLine) error {
obj, err := val.Object()
if err != nil {
return err
}
obj.Visit(func(key []byte, v *fastjson.Value) {
if err != nil {
return
}
k := jsonObjKey(prefix, string(key))
switch v.Type() {
case fastjson.TypeString, fastjson.TypeNumber:
err = p.parseStringNumber(k, v, line)
case fastjson.TypeArray:
err = p.parseArray(k, v, line)
case fastjson.TypeObject:
err = p.parseObject(k, v, line)
default:
return
}
})
return err
}
func jsonObjKey(prefix, key string) string {
if prefix == "" {
return key
}
return prefix + "." + key
}
func (p *JSONParser) parseArray(key string, val *fastjson.Value, line LogLine) error {
arr, err := val.Array()
if err != nil {
return err
}
for i, v := range arr {
k := jsonObjKey(key, strconv.Itoa(i))
switch v.Type() {
case fastjson.TypeString, fastjson.TypeNumber:
err = p.parseStringNumber(k, v, line)
case fastjson.TypeArray:
err = p.parseArray(k, v, line)
case fastjson.TypeObject:
err = p.parseObject(k, v, line)
default:
continue
}
if err != nil {
return err
}
}
return err
}
func (p *JSONParser) parseStringNumber(key string, val *fastjson.Value, line LogLine) error {
if mapped, ok := p.mapping[key]; ok {
key = mapped
}
p.buf = p.buf[:0]
if p.buf = val.MarshalTo(p.buf); len(p.buf) == 0 {
return nil
}
if val.Type() == fastjson.TypeString {
// trim "
return line.Assign(key, string(p.buf[1:len(p.buf)-1]))
}
return line.Assign(key, string(p.buf))
}
func (p *JSONParser) Info() string {
return fmt.Sprintf("json: %q", p.mapping)
}
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