Created
October 29, 2016 15:34
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App worker
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package main | |
/* | |
Run and it will create appmaster.exe which will create a new appworker.exe if it is shutdown. | |
Must delete appmaster.exe before each run. | |
Only tested on Windows. | |
Should build with: -ldflags -H windowsgui | |
*/ | |
import ( | |
"io/ioutil" | |
"log" | |
"os" | |
"os/exec" | |
"strconv" | |
"strings" | |
"time" | |
) | |
const ( | |
sleepTimeout = 200 | |
) | |
func main() { | |
self := os.Args[0] | |
pid := os.Getpid() | |
// Start Worker | |
if len(os.Args) != 2 { | |
slave := strings.Replace(self, "appworker.exe", "appmaster.exe", -1) | |
if !fileExists(slave) { | |
copyFile(self, slave) | |
cmd := exec.Command(slave, string(pid)) | |
err := cmd.Start() | |
if err != nil { | |
log.Println("Start error:", err) | |
} | |
cmd.Process.Release() | |
} else { | |
for { | |
// This is where you do work | |
time.Sleep(sleepTimeout * time.Millisecond) | |
} | |
} | |
log.Println("Master:", pid) | |
} else { // Start Master | |
app := strings.Replace(self, "appmaster.exe", "appworker.exe", -1) | |
i, _ := strconv.Atoi(os.Args[1]) | |
var p *os.Process | |
var err error | |
// Loop foreach | |
for { | |
// If process was killed | |
if p, err = os.FindProcess(i); err != nil { | |
cmd := exec.Command(app) | |
err = cmd.Start() | |
if err != nil { | |
log.Println("Start error:", err) | |
break | |
} | |
i = cmd.Process.Pid | |
cmd.Process.Release() | |
} else { // Process is still alive | |
p.Release() | |
} | |
time.Sleep(sleepTimeout * time.Millisecond) | |
} | |
} | |
} | |
func copyFile(src string, dst string) { | |
// Read all content of src to data | |
data, err := ioutil.ReadFile(src) | |
if err != nil { | |
log.Fatal(err) | |
} | |
// Write data to dst | |
err = ioutil.WriteFile(dst, data, 0644) | |
if err != nil { | |
log.Fatal(err) | |
} | |
} | |
func fileExists(filename string) bool { | |
if _, err := os.Stat(filename); err == nil { | |
return true | |
} | |
return false | |
} |
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