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encode.go
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encode.go
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package jsonfile
import (
"bytes"
"encoding/json"
"io"
"time"
"unicode/utf8"
"github.com/alibaba/pouch/daemon/logger"
"github.com/alibaba/pouch/pkg/utils"
)
type jsonLog struct {
Source string `json:"source,omitempty"`
Line string `json:"line,omitempty"`
Timestamp time.Time `json:"timestamp,omitempty"`
}
func newUnmarshal(r io.Reader) func() (*logger.LogMessage, error) {
dec := json.NewDecoder(r)
return func() (*logger.LogMessage, error) {
jl := &jsonLog{}
if err := dec.Decode(jl); err != nil {
return nil, err
}
return &logger.LogMessage{
Source: jl.Source,
Line: []byte(jl.Line),
Timestamp: jl.Timestamp,
}, nil
}
}
func marshal(msg *logger.LogMessage) ([]byte, error) {
var (
first = true
buf bytes.Buffer
)
buf.WriteString("{")
if len(msg.Source) != 0 {
first = false
buf.WriteString(`"source":`)
bytesIntoJSONString(&buf, []byte(msg.Source))
}
if len(msg.Line) != 0 {
if !first {
buf.WriteString(`,`)
}
first = false
buf.WriteString(`"line":`)
bytesIntoJSONString(&buf, msg.Line)
}
if !first {
buf.WriteString(`,`)
}
buf.WriteString(`"timestamp":`)
buf.WriteString(msg.Timestamp.UTC().Format(`"` + utils.TimeLayout + `"`))
buf.WriteString(`}`)
// NOTE: add newline here to make the decoder easier
buf.WriteByte('\n')
bs := buf.Bytes()
buf.Reset()
return bs, nil
}
// bytesIntoJSONString copies from encoding/json/encode.go#stringBytes
func bytesIntoJSONString(buf *bytes.Buffer, bs []byte) {
var hex = "0123456789abcdef"
buf.WriteByte('"')
start := 0
for i := 0; i < len(bs); {
if b := bs[i]; b < utf8.RuneSelf {
// This encodes bytes < 0x20 except for \t, \n and \r.
// If escapeHTML is set, it also escapes <, >, and &
// because they can lead to security holes when
// user-controlled strings are rendered into JSON
// and served to some browsers.
if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' {
i++
continue
}
if start < i {
buf.Write(bs[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:
buf.WriteString(`\u00`)
buf.WriteByte(hex[b>>4])
buf.WriteByte(hex[b&0xF])
}
i++
start = i
continue
}
c, size := utf8.DecodeRune(bs[i:])
if c == utf8.RuneError && size == 1 {
if start < i {
buf.Write(bs[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.Write(bs[start:i])
}
buf.WriteString(`\u202`)
buf.WriteByte(hex[c&0xF])
i += size
start = i
continue
}
i += size
}
if start < len(bs) {
buf.Write(bs[start:])
}
buf.WriteByte('"')
}