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cpu.go
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cpu.go
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// This file is part of the Smart Home
// Program complex distribution https://github.com/e154/smart-home
// Copyright (C) 2016-2021, Filippov Alex
//
// This library is free software: you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library. If not, see
// <https://www.gnu.org/licenses/>.
package metrics
import (
"sync"
"time"
"github.com/rcrowley/go-metrics"
"github.com/shirou/gopsutil/cpu"
"go.uber.org/atomic"
)
// Cpu ...
type Cpu struct {
Cores int64 `json:"cores"`
Mhz float64 `json:"mhz"`
All float64 `json:"all"`
}
// CpuManager ...
type CpuManager struct {
publisher IPublisher
cores int64
model string
mhz float64
all metrics.GaugeFloat64
allCpuPrevTotal float64
allCpuPrevIdle float64
quit chan struct{}
isStarted atomic.Bool
updateLock sync.Mutex
}
// NewCpuManager ...
func NewCpuManager(publisher IPublisher) (c *CpuManager) {
c = &CpuManager{
all: metrics.NewGaugeFloat64(),
quit: make(chan struct{}),
publisher: publisher,
}
cpuInfo, err := cpu.Info()
if err != nil {
return
}
c.mhz = cpuInfo[0].Mhz
c.cores = int64(cpuInfo[0].Cores)
c.model = cpuInfo[0].Model
return
}
func (c *CpuManager) start(pause int) {
if c.isStarted.Load() {
return
}
go func() {
ticker := time.NewTicker(time.Second * time.Duration(pause))
defer ticker.Stop()
c.isStarted.Store(true)
defer func() {
c.isStarted.Store(false)
}()
for {
select {
case <-c.quit:
return
case <-ticker.C:
c.selfUpdate()
}
}
}()
}
func (c *CpuManager) stop() {
if !c.isStarted.Load() {
return
}
c.quit <- struct{}{}
}
// Snapshot ...
func (c *CpuManager) Snapshot() Cpu {
c.updateLock.Lock()
defer c.updateLock.Unlock()
return Cpu{
Cores: c.cores,
Mhz: c.mhz,
All: c.all.Value(),
}
}
// All ...
func (c *CpuManager) All() float64 {
return c.all.Value()
}
func (c *CpuManager) selfUpdate() {
c.updateLock.Lock()
defer c.updateLock.Unlock()
timeStats, err := cpu.Times(false)
if err != nil || len(timeStats) == 0 {
return
}
total := timeStats[0].Total()
diffIdle := float64(timeStats[0].Idle - c.allCpuPrevIdle)
diffTotal := float64(total - c.allCpuPrevTotal)
c.all.Update(100 * (diffTotal - diffIdle) / diffTotal)
c.allCpuPrevTotal = total
c.allCpuPrevIdle = timeStats[0].Idle
c.broadcast()
}
func (c *CpuManager) broadcast() {
go c.publisher.Broadcast("cpu")
}