zlog/console.go

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package zerolog
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
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"sort"
"strconv"
"strings"
"sync"
"time"
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)
const (
colorBold = iota + 1
colorFaint
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)
const (
colorBlack = iota + 30
colorRed
colorGreen
colorYellow
colorBlue
colorMagenta
colorCyan
colorWhite
)
var (
consoleBufPool = sync.Pool{
New: func() interface{} {
return bytes.NewBuffer(make([]byte, 0, 100))
},
}
consoleDefaultTimeFormat = time.Kitchen
consoleDefaultFormatter = func(i interface{}) string { return fmt.Sprintf("%s", i) }
consoleDefaultPartsOrder = []string{
TimestampFieldName,
LevelFieldName,
CallerFieldName,
MessageFieldName,
}
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consoleNoColor = false
consoleTimeFormat = consoleDefaultTimeFormat
)
// Formatter transforms the input into a formatted string.
type Formatter func(interface{}) string
// ConsoleWriter parses the JSON input and writes it in an
// (optionally) colorized, human-friendly format to Out.
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type ConsoleWriter struct {
// Out is the output destination.
Out io.Writer
// NoColor disables the colorized output.
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NoColor bool
// TimeFormat specifies the format for timestamp in output.
TimeFormat string
// PartsOrder defines the order of parts in output.
PartsOrder []string
FormatTimestamp Formatter
FormatLevel Formatter
FormatCaller Formatter
FormatMessage Formatter
FormatFieldName Formatter
FormatFieldValue Formatter
FormatErrFieldName Formatter
FormatErrFieldValue Formatter
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}
// NewConsoleWriter creates and initializes a new ConsoleWriter.
func NewConsoleWriter(options ...func(w *ConsoleWriter)) ConsoleWriter {
w := ConsoleWriter{
Out: os.Stdout,
TimeFormat: consoleDefaultTimeFormat,
PartsOrder: consoleDefaultPartsOrder,
}
for _, opt := range options {
opt(&w)
}
return w
}
// Write transforms the JSON input with formatters and appends to w.Out.
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func (w ConsoleWriter) Write(p []byte) (n int, err error) {
if w.PartsOrder == nil {
w.PartsOrder = consoleDefaultPartsOrder
}
if w.TimeFormat == "" && consoleTimeFormat != consoleDefaultTimeFormat {
consoleTimeFormat = consoleDefaultTimeFormat
}
if w.TimeFormat != "" && consoleTimeFormat != w.TimeFormat {
consoleTimeFormat = w.TimeFormat
}
if w.NoColor == false && consoleNoColor != false {
consoleNoColor = false
}
if w.NoColor == true && consoleNoColor != w.NoColor {
consoleNoColor = w.NoColor
}
var buf = consoleBufPool.Get().(*bytes.Buffer)
defer consoleBufPool.Put(buf)
var evt map[string]interface{}
p = decodeIfBinaryToBytes(p)
d := json.NewDecoder(bytes.NewReader(p))
d.UseNumber()
err = d.Decode(&evt)
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if err != nil {
return n, fmt.Errorf("cannot decode event: %s", err)
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}
for _, p := range w.PartsOrder {
w.writePart(buf, evt, p)
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}
w.writeFields(evt, buf)
buf.WriteByte('\n')
buf.WriteTo(w.Out)
return len(p), nil
}
// writeFields appends formatted key-value pairs to buf.
func (w ConsoleWriter) writeFields(evt map[string]interface{}, buf *bytes.Buffer) {
var fields = make([]string, 0, len(evt))
for field := range evt {
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switch field {
case LevelFieldName, TimestampFieldName, MessageFieldName, CallerFieldName:
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continue
}
fields = append(fields, field)
}
sort.Strings(fields)
if len(fields) > 0 {
buf.WriteByte(' ')
}
// Move the "error" field to the front
ei := sort.Search(len(fields), func(i int) bool { return fields[i] >= ErrorFieldName })
if ei < len(fields) && fields[ei] == ErrorFieldName {
fields[ei] = ""
fields = append([]string{ErrorFieldName}, fields...)
var xfields = make([]string, 0, len(fields))
for _, field := range fields {
if field == "" { // Skip empty fields
continue
}
xfields = append(xfields, field)
}
fields = xfields
}
for i, field := range fields {
var fn Formatter
var fv Formatter
if field == ErrorFieldName {
if w.FormatErrFieldName == nil {
fn = consoleDefaultFormatErrFieldName
} else {
fn = w.FormatErrFieldName
}
if w.FormatErrFieldValue == nil {
fv = consoleDefaultFormatErrFieldValue
} else {
fv = w.FormatErrFieldValue
}
} else {
if w.FormatFieldName == nil {
fn = consoleDefaultFormatFieldName
} else {
fn = w.FormatFieldName
}
if w.FormatFieldValue == nil {
fv = consoleDefaultFormatFieldValue
} else {
fv = w.FormatFieldValue
}
}
buf.WriteString(fn(field))
switch fValue := evt[field].(type) {
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case string:
if needsQuote(fValue) {
buf.WriteString(fv(strconv.Quote(fValue)))
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} else {
buf.WriteString(fv(fValue))
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}
case json.Number:
buf.WriteString(fv(fValue))
default:
b, err := json.Marshal(fValue)
if err != nil {
fmt.Fprintf(buf, colorize("[error: %v]", colorRed, w.NoColor), err)
} else {
fmt.Fprint(buf, fv(b))
}
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}
if i < len(fields)-1 { // Skip space for last field
buf.WriteByte(' ')
}
}
}
// writePart appends a formatted part to buf.
func (w ConsoleWriter) writePart(buf *bytes.Buffer, evt map[string]interface{}, p string) {
var f Formatter
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switch p {
case LevelFieldName:
if w.FormatLevel == nil {
f = consoleDefaultFormatLevel
} else {
f = w.FormatLevel
}
case TimestampFieldName:
if w.FormatTimestamp == nil {
f = consoleDefaultFormatTimestamp
} else {
f = w.FormatTimestamp
}
case MessageFieldName:
if w.FormatMessage == nil {
f = consoleDefaultFormatMessage
} else {
f = w.FormatMessage
}
case CallerFieldName:
if w.FormatCaller == nil {
f = consoleDefaultFormatCaller
} else {
f = w.FormatCaller
}
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default:
if w.FormatFieldValue == nil {
f = consoleDefaultFormatFieldValue
} else {
f = w.FormatFieldValue
}
}
var s = f(evt[p])
if len(s) > 0 {
buf.WriteString(s)
if p != w.PartsOrder[len(w.PartsOrder)-1] { // Skip space for last part
buf.WriteByte(' ')
}
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}
}
// needsQuote returns true when the string s should be quoted in output.
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func needsQuote(s string) bool {
for i := range s {
if s[i] < 0x20 || s[i] > 0x7e || s[i] == ' ' || s[i] == '\\' || s[i] == '"' {
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return true
}
}
return false
}
// colorize returns the string s wrapped in ANSI code c, unless disabled is true.
func colorize(s interface{}, c int, disabled bool) string {
if disabled {
return fmt.Sprintf("%s", s)
}
return fmt.Sprintf("\x1b[%dm%v\x1b[0m", c, s)
}
// ----- DEFAULT FORMATTERS ---------------------------------------------------
var (
consoleDefaultFormatTimestamp = func(i interface{}) string {
t := "<nil>"
if tt, ok := i.(string); ok {
ts, err := time.Parse(time.RFC3339, tt)
if err != nil {
t = tt
} else {
t = ts.Format(consoleTimeFormat)
}
}
return colorize(t, colorFaint, consoleNoColor)
}
consoleDefaultFormatLevel = func(i interface{}) string {
var l string
if ll, ok := i.(string); ok {
switch ll {
case "debug":
l = colorize("DBG", colorYellow, consoleNoColor)
case "info":
l = colorize("INF", colorGreen, consoleNoColor)
case "warn":
l = colorize("WRN", colorRed, consoleNoColor)
case "error":
l = colorize(colorize("ERR", colorRed, consoleNoColor), colorBold, consoleNoColor)
case "fatal":
l = colorize(colorize("FTL", colorRed, consoleNoColor), colorBold, consoleNoColor)
case "panic":
l = colorize(colorize("PNC", colorRed, consoleNoColor), colorBold, consoleNoColor)
default:
l = colorize("???", colorBold, consoleNoColor)
}
} else {
l = strings.ToUpper(fmt.Sprintf("%s", i))[0:3]
}
return l
}
consoleDefaultFormatCaller = func(i interface{}) string {
var c string
if cc, ok := i.(string); ok {
c = cc
}
if len(c) > 0 {
cwd, err := os.Getwd()
if err == nil {
c = strings.TrimPrefix(c, cwd)
c = strings.TrimPrefix(c, "/")
}
c = colorize(c, colorBold, consoleNoColor) + colorize(" >", colorFaint, consoleNoColor)
}
return c
}
consoleDefaultFormatMessage = func(i interface{}) string {
return fmt.Sprintf("%s", i)
}
consoleDefaultFormatFieldName = func(i interface{}) string {
return colorize(fmt.Sprintf("%s=", i), colorFaint, consoleNoColor)
}
consoleDefaultFormatFieldValue = func(i interface{}) string {
return fmt.Sprintf("%s", i)
}
consoleDefaultFormatErrFieldName = func(i interface{}) string {
return colorize(fmt.Sprintf("%s=", i), colorRed, consoleNoColor)
}
consoleDefaultFormatErrFieldValue = func(i interface{}) string {
return colorize(fmt.Sprintf("%s", i), colorRed, consoleNoColor)
}
)