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terminal_format.go
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terminal_format.go
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package logger
import (
"bytes"
"encoding/json"
"fmt"
"reflect"
"strconv"
"sync"
"time"
)
const (
timeFormat = "2006-01-02T15:04:05-0700"
termTimeFormat = "2006/01/02 15:04:05"
termSmallTimeFormat = "15:04:05"
floatFormat = 'f'
errorKey = "REVEL_ERROR"
)
var (
levelString = map[LogLevel]string{LvlDebug: "DEBUG",
LvlInfo: "INFO", LvlWarn: "WARN", LvlError: "ERROR", LvlCrit: "CRIT"}
)
// Outputs to the terminal in a format like below
// INFO 09:11:32 server-engine.go:169: Request Stats
func TerminalFormatHandler(noColor bool, smallDate bool) LogFormat {
dateFormat := termTimeFormat
if smallDate {
dateFormat = termSmallTimeFormat
}
return FormatFunc(func(r *Record) []byte {
// Bash coloring http://misc.flogisoft.com/bash/tip_colors_and_formatting
var color = 0
switch r.Level {
case LvlCrit:
// Magenta
color = 35
case LvlError:
// Red
color = 31
case LvlWarn:
// Yellow
color = 33
case LvlInfo:
// Green
color = 32
case LvlDebug:
// Cyan
color = 36
}
b := &bytes.Buffer{}
caller, _ := r.Context["caller"].(string)
module, _ := r.Context["module"].(string)
if noColor == false && color > 0 {
if len(module) > 0 {
fmt.Fprintf(b, "\x1b[%dm%-5s\x1b[0m %s %6s %13s: %-40s ", color, levelString[r.Level], r.Time.Format(dateFormat), module, caller, r.Message)
} else {
fmt.Fprintf(b, "\x1b[%dm%-5s\x1b[0m %s %13s: %-40s ", color, levelString[r.Level], r.Time.Format(dateFormat), caller, r.Message)
}
} else {
fmt.Fprintf(b, "%-5s %s %6s %13s: %-40s", levelString[r.Level], r.Time.Format(dateFormat), module, caller, r.Message)
}
i := 0
for k, v := range r.Context {
if i != 0 {
b.WriteByte(' ')
}
i++
if k == "module" || k == "caller" {
continue
}
v := formatLogfmtValue(v)
// TODO: we should probably check that all of your key bytes aren't invalid
if noColor == false && color > 0 {
fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m=%s", color, k, v)
} else {
b.WriteString(k)
b.WriteByte('=')
b.WriteString(v)
}
}
b.WriteByte('\n')
return b.Bytes()
})
}
// formatValue formats a value for serialization
func formatLogfmtValue(value interface{}) string {
if value == nil {
return "nil"
}
if t, ok := value.(time.Time); ok {
// Performance optimization: No need for escaping since the provided
// timeFormat doesn't have any escape characters, and escaping is
// expensive.
return t.Format(termTimeFormat)
}
value = formatShared(value)
switch v := value.(type) {
case bool:
return strconv.FormatBool(v)
case float32:
return strconv.FormatFloat(float64(v), floatFormat, 3, 64)
case float64:
return strconv.FormatFloat(v, floatFormat, 7, 64)
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
return fmt.Sprintf("%d", value)
case string:
return escapeString(v)
default:
return escapeString(fmt.Sprintf("%+v", value))
}
}
// Format the value in json format
func formatShared(value interface{}) (result interface{}) {
defer func() {
if err := recover(); err != nil {
if v := reflect.ValueOf(value); v.Kind() == reflect.Ptr && v.IsNil() {
result = "nil"
} else {
panic(err)
}
}
}()
switch v := value.(type) {
case time.Time:
return v.Format(timeFormat)
case error:
return v.Error()
case fmt.Stringer:
return v.String()
default:
return v
}
}
// A reusuable buffer for outputting data
var stringBufPool = sync.Pool{
New: func() interface{} { return new(bytes.Buffer) },
}
// Escape the string when needed
func escapeString(s string) string {
needsQuotes := false
needsEscape := false
for _, r := range s {
if r <= ' ' || r == '=' || r == '"' {
needsQuotes = true
}
if r == '\\' || r == '"' || r == '\n' || r == '\r' || r == '\t' {
needsEscape = true
}
}
if needsEscape == false && needsQuotes == false {
return s
}
e := stringBufPool.Get().(*bytes.Buffer)
e.WriteByte('"')
for _, r := range s {
switch r {
case '\\', '"':
e.WriteByte('\\')
e.WriteByte(byte(r))
case '\n':
e.WriteString("\\n")
case '\r':
e.WriteString("\\r")
case '\t':
e.WriteString("\\t")
default:
e.WriteRune(r)
}
}
e.WriteByte('"')
var ret string
if needsQuotes {
ret = e.String()
} else {
ret = string(e.Bytes()[1 : e.Len()-1])
}
e.Reset()
stringBufPool.Put(e)
return ret
}
// JsonFormatEx formats log records as JSON objects. If pretty is true,
// records will be pretty-printed. If lineSeparated is true, records
// will be logged with a new line between each record.
func JsonFormatEx(pretty, lineSeparated bool) LogFormat {
jsonMarshal := json.Marshal
if pretty {
jsonMarshal = func(v interface{}) ([]byte, error) {
return json.MarshalIndent(v, "", " ")
}
}
return FormatFunc(func(r *Record) []byte {
props := make(map[string]interface{})
props["t"] = r.Time
props["lvl"] = levelString[r.Level]
props["msg"] = r.Message
for k, v := range r.Context {
props[k] = formatJsonValue(v)
}
b, err := jsonMarshal(props)
if err != nil {
b, _ = jsonMarshal(map[string]string{
errorKey: err.Error(),
})
return b
}
if lineSeparated {
b = append(b, '\n')
}
return b
})
}
func formatJsonValue(value interface{}) interface{} {
value = formatShared(value)
switch value.(type) {
case int, int8, int16, int32, int64, float32, float64, uint, uint8, uint16, uint32, uint64, string:
return value
default:
return fmt.Sprintf("%+v", value)
}
}