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// Package delta provides a log handler which times the delta
// between each log call, useful for debug output for command-line
// programs.
package delta
import (
"fmt"
"io"
"os"
"time"
"github.com/apex/log"
"github.com/aybabtme/rgbterm"
"github.com/tj/go-spin"
)
// TODO: move colors and share in text handler etc
// color function.
type colorFunc func(string) string
// gray string.
func gray(s string) string {
return rgbterm.FgString(s, 150, 150, 150)
}
// blue string.
func blue(s string) string {
return rgbterm.FgString(s, 77, 173, 247)
}
// cyan string.
func cyan(s string) string {
return rgbterm.FgString(s, 34, 184, 207)
}
// green string.
func green(s string) string {
return rgbterm.FgString(s, 0, 200, 255)
}
// red string.
func red(s string) string {
return rgbterm.FgString(s, 194, 37, 92)
}
// yellow string.
func yellow(s string) string {
return rgbterm.FgString(s, 252, 196, 25)
}
// Colors mapping.
var Colors = [...]colorFunc{
log.DebugLevel: gray,
log.InfoLevel: blue,
log.WarnLevel: yellow,
log.ErrorLevel: red,
log.FatalLevel: red,
}
// Strings mapping.
var Strings = [...]string{
log.DebugLevel: "DEBU",
log.InfoLevel: "INFO",
log.WarnLevel: "WARN",
log.ErrorLevel: "ERRO",
log.FatalLevel: "FATA",
}
// Default handler.
var Default = New(os.Stderr)
// Handler implementation.
type Handler struct {
entries chan *log.Entry
start time.Time
spin *spin.Spinner
prev *log.Entry
done chan struct{}
w io.Writer
}
// New handler.
func New(w io.Writer) *Handler {
h := &Handler{
entries: make(chan *log.Entry),
done: make(chan struct{}),
start: time.Now(),
spin: spin.New(),
w: w,
}
go h.loop()
return h
}
// Close the handler.
func (h *Handler) Close() error {
h.done <- struct{}{}
close(h.done)
close(h.entries)
return nil
}
// loop for rendering.
func (h *Handler) loop() {
ticker := time.NewTicker(100 * time.Millisecond)
for {
select {
case e := <-h.entries:
if h.prev != nil {
h.render(h.prev, true)
}
h.render(e, false)
h.prev = e
case <-ticker.C:
if h.prev != nil {
h.render(h.prev, false)
}
h.spin.Next()
case <-h.done:
ticker.Stop()
if h.prev != nil {
h.render(h.prev, true)
}
return
}
}
}
func (h *Handler) render(e *log.Entry, done bool) {
color := Colors[e.Level]
level := Strings[e.Level]
names := e.Fields.Names()
// delta and spinner
if done {
fmt.Fprintf(h.w, "\r %-7s", time.Since(h.start).Round(time.Millisecond))
} else {
fmt.Fprintf(h.w, "\r %s %-7s", h.spin.Current(), time.Since(h.start).Round(time.Millisecond))
}
// message
fmt.Fprintf(h.w, " %s %s", color(level), color(e.Message))
// fields
for _, name := range names {
v := e.Fields.Get(name)
if v == "" {
continue
}
fmt.Fprintf(h.w, " %s%s%v", color(name), gray("="), v)
}
// newline
if done {
fmt.Fprintf(h.w, "\n")
h.start = time.Now()
}
}
// HandleLog implements log.Handler.
func (h *Handler) HandleLog(e *log.Entry) error {
h.entries <- e
return nil
}
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