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package modules
import (
"errors"
"fmt"
"io/ioutil"
"os"
"strconv"
"strings"
"time"
)
const (
tempSensorCacheDuration = 24 * time.Hour
cpuUsageSampleInterval = 200 * time.Millisecond
tempMilliCelsiusDivisor = 1000.0
fahrenheitConversion = 9.0 / 5.0
fahrenheitBase = 32.0
)
type CPUUsage struct {
User int64
Nice int64
System int64
Idle int64
IOWait int64
IRQ int64
SoftIRQ int64
Steal int64
}
var (
cachedTemp float64
lastTempUpdate time.Time
cachedTempSensor string
tempSensorCachedAt time.Time
)
func GetCPUTemperature(fahrenheit bool) (float64, error) {
now := time.Now()
if now.Sub(lastTempUpdate) < time.Second {
return cachedTemp, nil
}
tempSensorPath, err := findTempSensor()
if err != nil {
return 0, fmt.Errorf("finding temp sensor: %w", err)
}
data, err := ioutil.ReadFile(tempSensorPath)
if err != nil {
return 0, fmt.Errorf("reading CPU temperature (%s): %w", tempSensorPath, err)
}
tempMilliCelsius, err := strconv.ParseInt(strings.TrimSpace(string(data)), 10, 64)
if err != nil {
return 0, fmt.Errorf("parsing CPU temperature: %w", err)
}
tempCelsius := float64(tempMilliCelsius) / tempMilliCelsiusDivisor
if fahrenheit {
tempCelsius = (tempCelsius * fahrenheitConversion) + fahrenheitBase
}
cachedTemp = tempCelsius
lastTempUpdate = now
return tempCelsius, nil
}
func GetCPUUsage() (float64, error) {
prevUsage, err := readCPUUsage()
if err != nil {
return 0, fmt.Errorf("reading initial CPU usage: %w", err)
}
time.Sleep(cpuUsageSampleInterval)
currUsage, err := readCPUUsage()
if err != nil {
return 0, fmt.Errorf("reading current CPU usage: %w", err)
}
usage := calculateCPUUsage(prevUsage, currUsage)
return usage, nil
}
func findTempSensor() (string, error) {
if cachedTempSensor != "" && time.Since(tempSensorCachedAt) < tempSensorCacheDuration {
return cachedTempSensor, nil
}
hwmonPath := "/sys/class/hwmon"
files, err := ioutil.ReadDir(hwmonPath)
if err != nil {
return "", fmt.Errorf("locating CPU temperature sensor directory: %w", err)
}
for _, file := range files {
sensorPath := fmt.Sprintf("%s/%s", hwmonPath, file.Name())
nameFilePath := fmt.Sprintf("%s/name", sensorPath)
nameData, err := ioutil.ReadFile(nameFilePath)
if err != nil {
continue
}
name := strings.TrimSpace(string(nameData))
if name == "coretemp" || name == "k10temp" || name == "zenpower" {
cachedTempSensor = fmt.Sprintf("%s/temp1_input", sensorPath)
tempSensorCachedAt = time.Now()
return cachedTempSensor, nil
}
}
return "", errors.New("appropriate CPU temperature sensor not found")
}
func readCPUUsage() (CPUUsage, error) {
data, err := os.ReadFile("/proc/stat")
if err != nil {
return CPUUsage{}, fmt.Errorf("reading /proc/stat: %w", err)
}
lines := strings.Split(string(data), "\n")
for _, line := range lines {
fields := strings.Fields(line)
if fields[0] == "cpu" {
usage := CPUUsage{
User: parseInt64(fields[1]),
Nice: parseInt64(fields[2]),
System: parseInt64(fields[3]),
Idle: parseInt64(fields[4]),
IOWait: parseInt64(fields[5]),
IRQ: parseInt64(fields[6]),
SoftIRQ: parseInt64(fields[7]),
}
return usage, nil
}
}
return CPUUsage{}, errors.New("failed to parse CPU usage from /proc/stat")
}
func calculateCPUUsage(prev, curr CPUUsage) float64 {
prevTotal := prev.User + prev.Nice + prev.System + prev.Idle + prev.IOWait + prev.IRQ + prev.SoftIRQ
currTotal := curr.User + curr.Nice + curr.System + curr.Idle + curr.IOWait + curr.IRQ + curr.SoftIRQ
totalDiff := float64(currTotal - prevTotal)
idleDiff := float64(curr.Idle - prev.Idle)
if totalDiff == 0 {
return 0
}
return (totalDiff - idleDiff) / totalDiff * 100
}
func parseInt64(s string) int64 {
n, _ := strconv.ParseInt(s, 10, 64)
return n
}
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