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cli.go
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cli.go
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package handler
import (
"fmt"
"io"
"runtime"
"sort"
"sync"
"github.com/apex/log"
)
// colors.
const (
none = 0
red = 31
green = 32
yellow = 33
blue = 34
gray = 90
)
// Colors mapping.
var Colors = [...]int{
log.DebugLevel: gray,
log.InfoLevel: blue,
log.WarnLevel: yellow,
log.ErrorLevel: red,
log.FatalLevel: red,
}
// Strings mapping.
var Strings = [...]string{
log.DebugLevel: "DEBUG",
log.InfoLevel: "INFO",
log.WarnLevel: "WARN",
log.ErrorLevel: "ERROR",
log.FatalLevel: "FATAL",
}
// field used for sorting.
type field struct {
Name string
Value interface{}
}
// by sorts projects by call count.
type byName []field
func (a byName) Len() int { return len(a) }
func (a byName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a byName) Less(i, j int) bool { return a[i].Name < a[j].Name }
// Handler implementation.
type Handler struct {
mu sync.Mutex
Writer io.Writer
}
// New handler.
func New(w io.Writer) *Handler {
return &Handler{
Writer: w,
}
}
// HandleLog implements log.Handler.
func (h *Handler) HandleLog(e *log.Entry) error {
color := Colors[e.Level]
level := Strings[e.Level]
var fields []field
for k, v := range e.Fields {
fields = append(fields, field{k, v})
}
sort.Sort(byName(fields))
h.mu.Lock()
defer h.mu.Unlock()
if runtime.GOOS == "windows" {
fmt.Fprintf(h.Writer, "%6s %-40s", level, e.Message)
} else {
fmt.Fprintf(h.Writer, "\033[%dm%6s\033[0m %-40s", color, level, e.Message)
}
for _, f := range fields {
var value interface{}
switch t := f.Value.(type) {
case []byte: // addresses and EUIs are []byte
value = fmt.Sprintf("%X", t)
case [21]byte: // bundle IDs [21]byte
value = fmt.Sprintf("%X-%X-%X-%X", t[0], t[1:9], t[9:17], t[17:])
default:
value = f.Value
}
if runtime.GOOS == "windows" {
fmt.Fprintf(h.Writer, " %s=%v", f.Name, value)
} else {
fmt.Fprintf(h.Writer, " \033[%dm%s\033[0m=%v", color, f.Name, value)
}
}
fmt.Fprintln(h.Writer)
return nil
}