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|
//go:build linux
package proc
import (
"context"
"fmt"
"os"
"os/exec"
"strconv"
"strings"
"time"
"github.com/pranshuparmar/witr/pkg/model"
)
// GetResourceContext returns resource usage context for a process
func GetResourceContext(pid int) *model.ResourceContext {
ctx := &model.ResourceContext{}
ctx.PreventsSleep = checkPreventsSleep(pid)
ctx.ThermalState = getThermalState()
ctx.AppNapped = getAppNapped(pid)
ctx.EnergyImpact = GetEnergyImpact(pid)
return ctx
}
// thermal zone info from /sys/class/thermal
func getThermalState() string {
path := "/sys/class/thermal/thermal_zone0/temp"
if _, err := os.Stat(path); os.IsNotExist(err) {
return ""
}
readText, err := os.ReadFile(path)
if err != nil {
return ""
}
tempstr := strings.TrimSpace(string(readText))
temp, err := strconv.Atoi(tempstr)
if err != nil {
return ""
}
tempC := temp / 1000
switch {
case tempC > 90:
return fmt.Sprintf("Critical thermal pressure %d", tempC)
case tempC > 70:
return fmt.Sprintf("High thermal pressure %d", tempC)
case tempC > 60:
return fmt.Sprintf("Warm thermal state %d", tempC)
default:
return fmt.Sprintf("Normal thermal state %d", tempC)
}
}
// checkPreventsSleep checks if a process has sleep prevention assertions
func checkPreventsSleep(pid int) bool {
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
out, err := exec.CommandContext(ctx, "systemd-inhibit", "--list").Output()
if err != nil {
return false
}
pidStr := strconv.Itoa(pid)
lines := strings.Split(string(out), "\n")
for _, line := range lines {
// Check if this line references our PID and is a sleep prevention assertion
if !strings.Contains(line, pidStr) {
continue
}
if strings.Contains(line, pidStr) {
lower := strings.ToLower(line)
if strings.Contains(lower, "sleep") ||
strings.Contains(lower, "idle") ||
strings.Contains(lower, "shutdown") {
return true
}
}
}
return false
}
// detect if process is in a stopped/suspended state
func getAppNapped(pid int) bool {
statFile := fmt.Sprintf("/proc/%d/stat", pid)
data, err := os.ReadFile(statFile)
if err != nil {
return false
}
dataStr := string(data)
lastParenIndex := strings.LastIndex(dataStr, ")")
if lastParenIndex == -1 || lastParenIndex+2 >= len(dataStr) {
return false
}
rest := dataStr[lastParenIndex+2:]
fields := strings.Fields(rest)
if len(fields) < 1 {
return false
}
state := fields[0]
return state == "T" || state == "t"
}
// GetEnergyImpact attempts to get energy impact for a process
func GetEnergyImpact(pid int, usePs ...bool) string {
var cpu float64
shouldUsePs := len(usePs) > 0 && usePs[0]
if shouldUsePs {
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
out, err := exec.CommandContext(ctx, "ps", "-p", strconv.Itoa(pid), "-o", "pcpu=").Output()
if err != nil {
return ""
}
cpuStr := strings.TrimSpace(string(out))
if cpuStr == "" {
return ""
}
cpu, err = strconv.ParseFloat(cpuStr, 64)
if err != nil {
return ""
}
} else {
// Use top (default)
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
out, err := exec.CommandContext(ctx, "top", "-b", "-n", "1", "-p", strconv.Itoa(pid)).Output()
if err != nil {
return ""
}
lines := strings.Split(string(out), "\n")
found := false
for _, line := range lines {
if strings.Contains(line, strconv.Itoa(pid)) {
fields := strings.Fields(line)
// CPU% is generally the 9th field in top output
// Output pattern: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
if len(fields) >= 9 {
cpuStr := strings.TrimSuffix(fields[8], "%")
cpu, err = strconv.ParseFloat(cpuStr, 64)
if err == nil {
found = true
break
}
}
}
}
if !found {
return ""
}
}
switch {
case cpu > 50:
return "Very High"
case cpu > 25:
return "High"
case cpu > 10:
return "Medium"
case cpu > 2:
return "Low"
case cpu > 0:
return "Very Low"
default:
return ""
}
}
|
