/
pb.go
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/
pb.go
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/*
* Minio Client (C) 2014, 2015 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"fmt"
"io"
"runtime"
"strings"
"sync/atomic"
"time"
"github.com/dustin/go-humanize"
"github.com/minio/minio/pkg/probe"
"github.com/minio/pb"
"github.com/olekukonko/ts"
"github.com/minio/mc/pkg/console"
)
type pbBarCmd int
const (
pbBarCmdExtend pbBarCmd = iota
pbBarCmdProgress
pbBarCmdFinish
pbBarCmdPutError
pbBarCmdGetError
pbBarCmdSetCaption
)
type proxyReader struct {
io.ReadCloser
bar *barSend
}
func (r *proxyReader) Read(p []byte) (n int, err error) {
n, err = r.ReadCloser.Read(p)
r.bar.Progress(int64(n))
return
}
func (r *proxyReader) Close() (err error) {
return r.ReadCloser.Close()
}
type barMsg struct {
Cmd pbBarCmd
Arg interface{}
}
type barSend struct {
cmdCh chan<- barMsg
finishCh <-chan bool
}
func (b *barSend) NewProxyReader(r io.ReadCloser) *proxyReader {
return &proxyReader{r, b}
}
func (b barSend) Extend(total int64) {
b.cmdCh <- barMsg{Cmd: pbBarCmdExtend, Arg: total}
}
func (b barSend) Progress(progress int64) {
b.cmdCh <- barMsg{Cmd: pbBarCmdProgress, Arg: progress}
}
func (b barSend) ErrorPut(size int64) {
b.cmdCh <- barMsg{Cmd: pbBarCmdPutError, Arg: size}
}
func (b barSend) ErrorGet(size int64) {
b.cmdCh <- barMsg{Cmd: pbBarCmdGetError, Arg: size}
}
func (b *barSend) SetCaption(c string) {
b.cmdCh <- barMsg{Cmd: pbBarCmdSetCaption, Arg: c}
}
func (b barSend) Finish() {
defer close(b.cmdCh)
b.cmdCh <- barMsg{Cmd: pbBarCmdFinish}
<-b.finishCh
console.Println()
}
func cursorAnimate() <-chan rune {
cursorCh := make(chan rune)
var cursors string
switch runtime.GOOS {
case "linux":
// cursors = "➩➪➫➬➭➮➯➱"
// cursors = "▁▃▄▅▆▇█▇▆▅▄▃"
cursors = "◐◓◑◒"
// cursors = "←↖↑↗→↘↓↙"
// cursors = "◴◷◶◵"
// cursors = "◰◳◲◱"
case "darwin":
cursors = "◐◓◑◒"
//cursors = "⣾⣽⣻⢿⡿⣟⣯⣷"
default:
cursors = "|/-\\"
}
go func() {
for {
for _, cursor := range cursors {
cursorCh <- cursor
}
}
}()
return cursorCh
}
func fixateBarCaption(caption string, width int) string {
switch {
case len(caption) > width:
// Trim caption to fit within the screen
trimSize := len(caption) - width + 3
if trimSize < len(caption) {
caption = "..." + caption[trimSize:]
}
case len(caption) < width:
caption += strings.Repeat(" ", width-len(caption))
}
return caption
}
func getFixedWidth(width, percent int) int {
return width * percent / 100
}
// newCpBar - instantiate a pbBar.
func newCpBar() barSend {
cmdCh := make(chan barMsg)
finishCh := make(chan bool)
go func(cmdCh <-chan barMsg, finishCh chan<- bool) {
var started bool
var totalBytesRead int64 // total amounts of bytes read
bar := pb.New64(0)
bar.SetUnits(pb.U_BYTES)
bar.SetRefreshRate(time.Millisecond * 125)
bar.NotPrint = true
bar.ShowSpeed = true
bar.Callback = func(s string) {
console.Print(console.Colorize("Bar", "\r"+s))
}
switch runtime.GOOS {
case "linux":
bar.Format("┃▓█░┃")
// bar.Format("█▓▒░█")
case "darwin":
bar.Format(" ▓ ░ ")
default:
bar.Format("[=> ]")
}
for msg := range cmdCh {
switch msg.Cmd {
case pbBarCmdSetCaption:
bar.Prefix(fixateBarCaption(msg.Arg.(string), getFixedWidth(bar.GetWidth(), 18)))
case pbBarCmdExtend:
atomic.AddInt64(&bar.Total, msg.Arg.(int64))
case pbBarCmdProgress:
if bar.Total > 0 && !started {
started = true
bar.Start()
}
if msg.Arg.(int64) > 0 {
totalBytesRead += msg.Arg.(int64)
bar.Add64(msg.Arg.(int64))
}
case pbBarCmdPutError:
if totalBytesRead > msg.Arg.(int64) {
bar.Set64(totalBytesRead - msg.Arg.(int64))
}
case pbBarCmdGetError:
if msg.Arg.(int64) > 0 {
bar.Add64(msg.Arg.(int64))
}
case pbBarCmdFinish:
if started {
bar.Finish()
}
finishCh <- true
return
}
}
}(cmdCh, finishCh)
return barSend{cmdCh, finishCh}
}
/******************************** Scan Bar ************************************/
// fixateScanBar truncates long text to fit within the terminal size.
func fixateScanBar(text string, width int) string {
if len([]rune(text)) > width {
// Trim text to fit within the screen
trimSize := len([]rune(text)) - width + 3 //"..."
if trimSize < len([]rune(text)) {
text = "..." + text[trimSize:]
}
}
return text
}
// Progress bar function report objects being scaned.
type scanBarFunc func(string)
// scanBarFactory returns a progress bar function to report URL scanning.
func scanBarFactory(prefix string) scanBarFunc {
prevLineSize := 0
fileCount := 0
termSize, err := ts.GetSize()
if err != nil {
fatalIf(probe.NewError(err), "Unable to get terminal size.")
}
termWidth := termSize.Col()
cursorCh := cursorAnimate()
return func(source string) {
scanPrefix := fmt.Sprintf("[%s] %s ", humanize.Comma(int64(fileCount)), string(<-cursorCh))
if prefix != "" {
scanPrefix = fmt.Sprintf("Scanning %s [%s] %s ", prefix, humanize.Comma(int64(fileCount)), string(<-cursorCh))
}
if prevLineSize != 0 { // erase previous line
console.PrintC("\r" + scanPrefix + strings.Repeat(" ", prevLineSize-len([]rune(scanPrefix))))
}
source = fixateScanBar(source, termWidth-len([]rune(scanPrefix))-1)
barText := "\r" + scanPrefix + source
console.PrintC(barText)
prevLineSize = len([]rune(barText))
fileCount++
}
}