mirror of
https://github.com/yunionio/cloudpods.git
synced 2026-05-12 08:57:26 +08:00
135 lines
2.8 KiB
Go
135 lines
2.8 KiB
Go
// Copyright 2019 Yunion
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pb
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import (
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"context"
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"io"
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"time"
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"golang.org/x/time/rate"
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)
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const (
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BURSTS = 1024 * 1024 * 1024
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)
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type SProxyReader struct {
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reader io.Reader
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size int64
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cur int64
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lastCur int64
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finish chan bool
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debug bool
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ticker *time.Ticker
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start time.Time
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callback func()
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ctx context.Context
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refreshRate time.Duration
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// Mbps
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rateLimit *rate.Limiter
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}
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func NewProxyReader(reader io.Reader, size int64) *SProxyReader {
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return &SProxyReader{
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reader: reader,
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size: size,
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finish: make(chan bool),
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ctx: context.Background(),
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refreshRate: time.Second * 1,
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}
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}
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func (self *SProxyReader) SetRateLimit(mb int) {
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self.rateLimit = rate.NewLimiter(rate.Limit(mb*1024*1024), BURSTS)
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self.rateLimit.AllowN(time.Now(), BURSTS)
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}
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// 设置刷新频率
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// 仅在读取数据前生效
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func (self *SProxyReader) SetRefreshRate(rate time.Duration) {
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if rate > time.Second && self.cur == 0 {
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self.refreshRate = rate
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}
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}
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func (self *SProxyReader) SetCallback(callback func()) {
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self.callback = callback
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}
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func (self *SProxyReader) Percent() float64 {
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return float64(self.cur) / float64(self.size) * 100.0
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}
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func (self *SProxyReader) AvgRate() float64 {
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return float64(self.cur) / float64(1024) / float64(1024) / float64(time.Now().Sub(self.start).Seconds())
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}
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func (self *SProxyReader) Rate() float64 {
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return float64(self.cur-self.lastCur) / float64(1024) / float64(1024) / float64(self.refreshRate.Seconds())
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}
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func (self *SProxyReader) Read(p []byte) (n int, err error) {
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defer func() {
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if err != nil {
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self.finish <- true
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close(self.finish)
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}
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}()
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if self.start.IsZero() {
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self.start = time.Now()
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self.ticker = time.NewTicker(self.refreshRate)
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go self.refresh(self.finish)
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}
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n, err = self.reader.Read(p)
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if err != nil {
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return n, err
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}
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if self.rateLimit != nil {
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err = self.rateLimit.WaitN(self.ctx, n)
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if err != nil {
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return n, err
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}
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}
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self.cur += int64(n)
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return n, nil
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}
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func (self *SProxyReader) refresh(finishChan chan bool) {
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defer self.ticker.Stop()
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for {
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select {
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case <-self.ticker.C:
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if self.callback != nil {
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self.callback()
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}
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self.lastCur = self.cur
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case finished := <-finishChan:
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if finished {
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return
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}
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}
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}
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}
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