90 lines
1.7 KiB
Go
90 lines
1.7 KiB
Go
package etcdserver
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
queueCapacity = 200
|
|
)
|
|
|
|
type statsQueue struct {
|
|
items [queueCapacity]*packageStats
|
|
size int
|
|
front int
|
|
back int
|
|
totalPkgSize int
|
|
rwl sync.RWMutex
|
|
}
|
|
|
|
func (q *statsQueue) Len() int {
|
|
return q.size
|
|
}
|
|
|
|
func (q *statsQueue) PkgSize() int {
|
|
return q.totalPkgSize
|
|
}
|
|
|
|
// FrontAndBack gets the front and back elements in the queue
|
|
// We must grab front and back together with the protection of the lock
|
|
func (q *statsQueue) frontAndBack() (*packageStats, *packageStats) {
|
|
q.rwl.RLock()
|
|
defer q.rwl.RUnlock()
|
|
if q.size != 0 {
|
|
return q.items[q.front], q.items[q.back]
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// Insert function insert a packageStats into the queue and update the records
|
|
func (q *statsQueue) Insert(p *packageStats) {
|
|
q.rwl.Lock()
|
|
defer q.rwl.Unlock()
|
|
|
|
q.back = (q.back + 1) % queueCapacity
|
|
|
|
if q.size == queueCapacity { //dequeue
|
|
q.totalPkgSize -= q.items[q.front].size
|
|
q.front = (q.back + 1) % queueCapacity
|
|
} else {
|
|
q.size++
|
|
}
|
|
|
|
q.items[q.back] = p
|
|
q.totalPkgSize += q.items[q.back].size
|
|
|
|
}
|
|
|
|
// Rate function returns the package rate and byte rate
|
|
func (q *statsQueue) Rate() (float64, float64) {
|
|
front, back := q.frontAndBack()
|
|
|
|
if front == nil || back == nil {
|
|
return 0, 0
|
|
}
|
|
|
|
if time.Now().Sub(back.Time()) > time.Second {
|
|
q.Clear()
|
|
return 0, 0
|
|
}
|
|
|
|
sampleDuration := back.Time().Sub(front.Time())
|
|
|
|
pr := float64(q.Len()) / float64(sampleDuration) * float64(time.Second)
|
|
|
|
br := float64(q.PkgSize()) / float64(sampleDuration) * float64(time.Second)
|
|
|
|
return pr, br
|
|
}
|
|
|
|
// Clear function clear up the statsQueue
|
|
func (q *statsQueue) Clear() {
|
|
q.rwl.Lock()
|
|
defer q.rwl.Unlock()
|
|
q.back = -1
|
|
q.front = 0
|
|
q.size = 0
|
|
q.totalPkgSize = 0
|
|
}
|