vendor/github.com/go-kit/kit/log/term/example_test.go

   1 package term_test
   2
   3 import (
   4         "errors"
   5         "os"
   6
   7         "github.com/go-kit/kit/log"
   8         "github.com/go-kit/kit/log/term"
   9 )
  10
  11 func ExampleNewLogger_redErrors() {
  12         // Color errors red
  13         colorFn := func(keyvals ...interface{}) term.FgBgColor {
  14                 for i := 1; i < len(keyvals); i += 2 {
  15                         if _, ok := keyvals[i].(error); ok {
  16                                 return term.FgBgColor{Fg: term.White, Bg: term.Red}
  17                         }
  18                 }
  19                 return term.FgBgColor{}
  20         }
  21
  22         logger := term.NewLogger(os.Stdout, log.NewLogfmtLogger, colorFn)
  23
  24         logger.Log("msg", "default color", "err", nil)
  25         logger.Log("msg", "colored because of error", "err", errors.New("coloring error"))
  26 }
  27
  28 func ExampleNewLogger_levelColors() {
  29         // Color by level value
  30         colorFn := func(keyvals ...interface{}) term.FgBgColor {
  31                 for i := 0; i < len(keyvals)-1; i += 2 {
  32                         if keyvals[i] != "level" {
  33                                 continue
  34                         }
  35                         switch keyvals[i+1] {
  36                         case "debug":
  37                                 return term.FgBgColor{Fg: term.DarkGray}
  38                         case "info":
  39                                 return term.FgBgColor{Fg: term.Gray}
  40                         case "warn":
  41                                 return term.FgBgColor{Fg: term.Yellow}
  42                         case "error":
  43                                 return term.FgBgColor{Fg: term.Red}
  44                         case "crit":
  45                                 return term.FgBgColor{Fg: term.Gray, Bg: term.DarkRed}
  46                         default:
  47                                 return term.FgBgColor{}
  48                         }
  49                 }
  50                 return term.FgBgColor{}
  51         }
  52
  53         logger := term.NewLogger(os.Stdout, log.NewJSONLogger, colorFn)
  54
  55         logger.Log("level", "warn", "msg", "yellow")
  56         logger.Log("level", "debug", "msg", "dark gray")
  57 }