/
system.go
265 lines (246 loc) · 6.96 KB
/
system.go
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package main
import (
"os/exec"
"errors"
"strings"
"strconv"
"encoding/json"
"regexp"
//"log"
)
type SystemCpuInfo struct {
NumCores uint16 `json:"numCores"`;
MinuteAverage float64 `json:"minuteAverage"`;
FiveMinuteAverage float64 `json:"fiveMinuteAverage"`;
FifteenMinuteAverage float64 `json:"fifteenMinuteAverage"`;
}
type SystemMemoryInfo struct {
TotalKb uint64 `json:"totalKb"`;
FreeKb uint64 `json:"freeKb"`;
}
type SystemInfo struct {
Cpu SystemCpuInfo `json:"cpu"`;
Memory SystemMemoryInfo `json:"memory"`;
}
type System struct {
config *Config;
currentInfo SystemInfo;
};
func (this SystemInfo) Encode() ([]byte, error) {
return json.Marshal(this)
}
func (this SystemInfo) GetType() (string) {
return "system";
}
func (this System) Monitor() (Info, error) {
this.ClearResults();
uname, _ := this.getUname();
var data string;
var err error;
switch (uname) {
case "Darwin":
data, err = this.execCommand("sysctl -n hw.ncpu")
if err != nil {
return this.currentInfo, nil
}
err = this.parseNumCpuSysctl(&this.currentInfo.Cpu, data)
if err != nil {
return this.currentInfo, nil
}
data, err = this.execCommand("sysctl -n vm.loadavg")
if err != nil {
return this.currentInfo, nil
}
err = this.parseLoadAverageSysctl(&this.currentInfo.Cpu, data)
if err != nil {
return this.currentInfo, nil
}
data, err = this.execCommand("sysctl -n hw.memsize")
if err != nil {
return this.currentInfo, nil
}
err = this.parseMemsizeSysctl(&this.currentInfo.Memory, data)
if err != nil {
return this.currentInfo, nil
}
data, err = this.execCommand("vm_stat")
if err != nil {
return this.currentInfo, nil
}
err = this.parseVmstat(&this.currentInfo.Memory, data)
if err != nil {
return this.currentInfo, nil
}
break
default:
data, err = this.execCommand("cat /proc/cpuinfo")
if err != nil {
return this.currentInfo, nil
}
err = this.parseCpuinfoProc(&this.currentInfo.Cpu, data)
if err != nil {
return this.currentInfo, nil
}
data, err = this.execCommand("cat /proc/loadavg")
if err != nil {
return this.currentInfo, nil
}
err = this.parseLoadAverageProc(&this.currentInfo.Cpu, data)
if err != nil {
return this.currentInfo, nil
}
data, err = this.execCommand("cat /proc/meminfo")
if err != nil {
return this.currentInfo, nil
}
err = this.parseMeminfoProc(&this.currentInfo.Memory, data)
if err != nil {
return this.currentInfo, nil
}
break
}
info := Info(this.currentInfo);
return info, err
}
func (this System) ClearResults() () {
this.currentInfo = SystemInfo{
SystemCpuInfo{},
SystemMemoryInfo{},
}
}
func (this System) execCommand(commandStr string) (string, error) {
command := strings.Split(commandStr, " ");
cmd := exec.Command(command[0], command[1:]...)
data, err := cmd.Output()
if err != nil {
return "", err
}
return strings.TrimSpace(string(data)), nil
}
func (this System) getUname() (string, error) {
data, err := exec.Command("uname").Output();
if err != nil {
return "", err
}
return strings.TrimSpace(string(data)), nil
}
func (this System) parseNumCpuSysctl(cpuInfo *SystemCpuInfo, data string) (error) {
data = strings.TrimSpace(data)
cpuCores, err := strconv.ParseUint(data, 10, 16)
if err != nil {
return err
}
cpuInfo.NumCores = uint16(cpuCores)
return nil
}
func (this System) parseMemsizeSysctl(info *SystemMemoryInfo, data string) (error) {
data = strings.TrimSpace(data)
total, err := strconv.ParseUint(data, 10, 64)
if err != nil {
return err
}
info.TotalKb = total / 1024;
return nil
}
func (this System) parseLoadAverageSysctl(cpuInfo *SystemCpuInfo, data string) (error) {
data = strings.Replace(data, "{", "", -1)
data = strings.Replace(data, "}", "", -1)
data = strings.Replace(data, "\t", " ", -1)
data = strings.Replace(data, " ", " ", -1)
data = strings.TrimSpace(data)
averages := strings.Split(data, " ")
var err error;
if (len(averages) < 3) {
return errors.New("Invalid load average format")
}
cpuInfo.MinuteAverage, err = strconv.ParseFloat(averages[0], 64)
if err != nil {
return err
}
cpuInfo.FiveMinuteAverage, err = strconv.ParseFloat(averages[1], 64)
if err != nil {
return err
}
cpuInfo.FifteenMinuteAverage, err = strconv.ParseFloat(averages[2], 64)
if err != nil {
return err
}
return nil
}
func (this System) parseCpuinfoProc(cpuInfo *SystemCpuInfo, data string) (error) {
processors := regexp.MustCompile("processor\\s*\\:").Split(data, -1)
cpuInfo.NumCores = uint16(len(processors) - 1)
return nil
}
func (this System) parseLoadAverageProc(cpuInfo *SystemCpuInfo, data string) (error) {
data = strings.Replace(data, "\t", " ", -1)
data = strings.Replace(data, " ", " ", -1)
data = strings.TrimSpace(data)
averages := strings.Split(data, " ")
var err error;
cpuInfo.MinuteAverage, err = strconv.ParseFloat(averages[0], 64)
if err != nil {
return err
}
cpuInfo.FiveMinuteAverage, err = strconv.ParseFloat(averages[1], 64)
if err != nil {
return err
}
cpuInfo.FifteenMinuteAverage, err = strconv.ParseFloat(averages[2], 64)
if err != nil {
return err
}
return nil
}
func (this System) parseMeminfoProc(memoryInfo *SystemMemoryInfo, data string) (error) {
data = strings.TrimSpace(data);
lines := strings.Split(data, "\n");
for i := 0; len(lines) > i; i++ {
item := regexp.MustCompile(":\\s+").Split(lines[i], -1)
if len(item) < 2 {
continue;
}
key := strings.ToLower(item[0])
value := regexp.MustCompile("\\s+").Split(item[1], 2)
if len(value) < 2 {
continue;
}
if strings.ToLower(value[1]) != "kb" {
return errors.New("Unsupported unit encountered in /proc/meminfo")
}
numKb, _ := strconv.ParseUint(value[0], 10, 64)
if key == "memtotal" {
memoryInfo.TotalKb = numKb
}
if key == "memfree" {
memoryInfo.FreeKb = numKb
}
}
return nil
}
func (this System) parseVmstat(memoryInfo *SystemMemoryInfo, data string) (error) {
data = strings.TrimSpace(data);
lines := strings.Split(data, "\n");
var totalUsageKb uint64 = 0
for i := 1; len(lines) > i; i++ {
item := regexp.MustCompile(":\\s+").Split(lines[i], -1)
if len(item) < 2 {
continue;
}
key := strings.ToLower(item[0])
value := strings.Replace(item[1], ".", "", 1)
numPages, _ := strconv.ParseUint(value, 10, 64)
numKb := ((numPages * 4096) / 1024)
if key == "pages active" {
totalUsageKb = totalUsageKb + numKb
}
if key == "pages wired down" {
totalUsageKb = totalUsageKb + numKb
}
}
if (totalUsageKb > memoryInfo.TotalKb) {
return nil
}
memoryInfo.FreeKb = memoryInfo.TotalKb - totalUsageKb
return nil
}