/
accounting-reader.go
120 lines (105 loc) · 2.52 KB
/
accounting-reader.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"
"sync"
"sync/atomic"
"time"
"github.com/minio/pb"
)
type accountingReader struct {
io.ReadCloser
acct *accounter
}
type accounter struct {
current int64
Total int64
startTime time.Time
startValue int64
refreshRate time.Duration
currentValue int64
finishOnce sync.Once
isFinished chan struct{}
}
// Instantiate a new accounter
func newAccounter(total int64) *accounter {
acct := &accounter{
Total: total,
startTime: time.Now(),
startValue: 0,
refreshRate: time.Millisecond * 200,
isFinished: make(chan struct{}),
currentValue: -1,
}
go acct.writer()
return acct
}
func (a *accounter) write(current int64) string {
var speedBox string
fromStart := time.Now().Sub(a.startTime)
currentFromStart := current - a.startValue
if currentFromStart > 0 {
speed := float64(currentFromStart) / (float64(fromStart) / float64(time.Second))
speedBox = pb.FormatBytes(int64(speed))
}
if speedBox == "" {
speedBox = "0 MB"
}
return speedBox + "/s"
}
func (a *accounter) writer() {
a.Update()
for {
select {
case <-a.isFinished:
return
case <-time.After(a.refreshRate):
a.Update()
}
}
}
func (a *accounter) Finish() string {
var message string
a.finishOnce.Do(func() {
close(a.isFinished)
message = fmt.Sprintf("Total: %s, Transferred: %s, Speed: %s", pb.FormatBytes(a.Total),
pb.FormatBytes(a.current), a.write(atomic.LoadInt64(&a.current)))
})
return message
}
func (a *accounter) Update() {
c := atomic.LoadInt64(&a.current)
if c != a.currentValue {
a.write(c)
a.currentValue = c
}
}
func (a *accounter) Add(n int64) int64 {
return atomic.AddInt64(&a.current, n)
}
func (a *accounter) NewProxyReader(r io.ReadCloser) *accountingReader {
return &accountingReader{r, a}
}
func (a *accountingReader) Read(p []byte) (n int, err error) {
n, err = a.ReadCloser.Read(p)
if err != nil {
return
}
a.acct.Add(int64(n))
return
}