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json.go
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json.go
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package logstash
import (
"bytes"
"encoding/json"
"math"
"strconv"
"unicode/utf8"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/outputs"
)
type encoder struct {
buf *bytes.Buffer
scratch [64]byte
}
var hex = "0123456789abcdef"
func makeLogstashEventEncoder(beat string) (func(interface{}) ([]byte, error), error) {
enc := encoder{buf: bytes.NewBuffer(nil)}
beatName, err := json.Marshal(beat)
if err != nil {
return nil, err
}
cb := func(rawData interface{}) ([]byte, error) {
event := rawData.(outputs.Data).Event
buf := enc.buf
buf.Reset()
buf.WriteRune('{')
if _, hasMeta := event["@metadata"]; !hasMeta {
buf.WriteString(`"@metadata":{"type":"doc","beat":`)
buf.Write(beatName)
buf.WriteString(`},`)
}
err := enc.encodeKeyValues(event)
if err != nil {
logp.Err("jsonEncode failed with: %v", err)
return nil, err
}
b := buf.Bytes()
b[len(b)-1] = '}'
return buf.Bytes(), nil
}
return cb, nil
}
func (enc *encoder) encodeKeyValues(event common.MapStr) error {
buf := enc.buf
for k, v := range event {
encodeString(buf, k)
buf.WriteRune(':')
switch val := v.(type) {
case common.MapStr:
buf.WriteRune('{')
if len(val) == 0 {
buf.WriteRune('}')
} else {
if err := enc.encodeKeyValues(val); err != nil {
return err
}
b := buf.Bytes()
b[len(b)-1] = '}'
}
case bool:
if val {
buf.WriteString("true")
} else {
buf.WriteString("false")
}
case int8:
enc.encodeInt(int64(val))
case int16:
enc.encodeInt(int64(val))
case int32:
enc.encodeInt(int64(val))
case int64:
enc.encodeInt(val)
case uint8:
enc.encodeUint(uint64(val))
case uint16:
enc.encodeUint(uint64(val))
case uint32:
enc.encodeUint(uint64(val))
case uint64:
enc.encodeUint(val)
case float32:
enc.encodeFloat(float64(val))
case float64:
enc.encodeFloat(val)
default:
// fallback to json.Marshal
tmp, err := json.Marshal(v)
if err != nil {
return err
}
buf.Write(tmp)
}
buf.WriteRune(',')
}
return nil
}
func (enc *encoder) encodeInt(i int64) {
b := strconv.AppendInt(enc.scratch[:0], i, 10)
enc.buf.Write(b)
}
func (enc *encoder) encodeUint(u uint64) {
b := strconv.AppendUint(enc.scratch[:0], u, 10)
enc.buf.Write(b)
}
func (enc *encoder) encodeFloat(f float64) {
switch {
case math.IsInf(f, 0):
enc.buf.WriteString("Inf")
case math.IsNaN(f):
enc.buf.WriteString("NaN")
default:
b := strconv.AppendFloat(enc.scratch[:0], f, 'g', -1, 64)
enc.buf.Write(b)
}
}
// JSON string encoded copied from "json" package
func encodeString(buf *bytes.Buffer, s string) {
buf.WriteByte('"')
start := 0
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' {
i++
continue
}
if start < i {
buf.WriteString(s[start:i])
}
switch b {
case '\\', '"':
buf.WriteByte('\\')
buf.WriteByte(b)
case '\n':
buf.WriteByte('\\')
buf.WriteByte('n')
case '\r':
buf.WriteByte('\\')
buf.WriteByte('r')
case '\t':
buf.WriteByte('\\')
buf.WriteByte('t')
default:
// This encodes bytes < 0x20 except for \n and \r,
// as well as <, > and &. The latter are escaped because they
// can lead to security holes when user-controlled strings
// are rendered into JSON and served to some browsers.
buf.WriteString(`\u00`)
buf.WriteByte(hex[b>>4])
buf.WriteByte(hex[b&0xF])
}
i++
start = i
continue
}
c, size := utf8.DecodeRuneInString(s[i:])
if c == utf8.RuneError && size == 1 {
if start < i {
buf.WriteString(s[start:i])
}
buf.WriteString(`\ufffd`)
i += size
start = i
continue
}
// U+2028 is LINE SEPARATOR.
// U+2029 is PARAGRAPH SEPARATOR.
// They are both technically valid characters in JSON strings,
// but don't work in JSONP, which has to be evaluated as JavaScript,
// and can lead to security holes there. It is valid JSON to
// escape them, so we do so unconditionally.
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
if c == '\u2028' || c == '\u2029' {
if start < i {
buf.WriteString(s[start:i])
}
buf.WriteString(`\u202`)
buf.WriteByte(hex[c&0xF])
i += size
start = i
continue
}
i += size
}
if start < len(s) {
buf.WriteString(s[start:])
}
buf.WriteByte('"')
}