118 lines
2.3 KiB
Go
118 lines
2.3 KiB
Go
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package zerolog
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"sort"
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"strconv"
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"strings"
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"sync"
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)
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const (
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cReset = 0
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cBold = 1
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cRed = 31
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cGreen = 32
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cYellow = 33
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cBlue = 34
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cMagenta = 35
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cCyan = 36
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cGray = 37
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cDarkGray = 90
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)
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var consoleBufPool = sync.Pool{
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New: func() interface{} {
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return bytes.NewBuffer(make([]byte, 0, 100))
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},
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}
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// ConsoleWriter reads a JSON object per write operation and output an
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// optionally colored human readable version on the Out writer.
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type ConsoleWriter struct {
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Out io.Writer
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NoColor bool
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}
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func (w ConsoleWriter) Write(p []byte) (n int, err error) {
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var event map[string]interface{}
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err = json.Unmarshal(p, &event)
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if err != nil {
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return
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}
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buf := consoleBufPool.Get().(*bytes.Buffer)
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defer consoleBufPool.Put(buf)
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lvlColor := cReset
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level := "????"
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if l, ok := event[LevelFieldName].(string); ok {
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if !w.NoColor {
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lvlColor = levelColor(l)
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}
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level = strings.ToUpper(l)[0:4]
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}
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fmt.Fprintf(buf, "%s |%s| %s",
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colorize(event[TimestampFieldName], cDarkGray, !w.NoColor),
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colorize(level, lvlColor, !w.NoColor),
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colorize(event[MessageFieldName], cReset, !w.NoColor))
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fields := make([]string, 0, len(event))
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for field := range event {
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switch field {
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case LevelFieldName, TimestampFieldName, MessageFieldName:
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continue
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}
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fields = append(fields, field)
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}
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sort.Strings(fields)
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for _, field := range fields {
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fmt.Fprintf(buf, " %s=", colorize(field, cCyan, !w.NoColor))
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switch value := event[field].(type) {
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case string:
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if needsQuote(value) {
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buf.WriteString(strconv.Quote(value))
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} else {
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buf.WriteString(value)
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}
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default:
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fmt.Fprint(buf, value)
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}
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}
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buf.WriteByte('\n')
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buf.WriteTo(w.Out)
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n = len(p)
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return
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}
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func colorize(s interface{}, color int, enabled bool) string {
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if !enabled {
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return fmt.Sprintf("%v", s)
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}
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return fmt.Sprintf("\x1b[%dm%v\x1b[0m", color, s)
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}
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func levelColor(level string) int {
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switch level {
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case "debug":
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return cMagenta
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case "info":
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return cGreen
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case "warn":
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return cYellow
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case "error", "fatal", "panic":
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return cRed
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default:
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return cReset
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}
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}
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func needsQuote(s string) bool {
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for i := range s {
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if s[i] < 0x20 || s[i] > 0x7e || s[i] == ' ' || s[i] == '\\' || s[i] == '"' {
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return true
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}
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}
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return false
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}
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