forked from mackerelio/mackerel-agent
/
wrapper_windows.go
146 lines (131 loc) · 3.29 KB
/
wrapper_windows.go
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package main
import (
"bufio"
"io"
"log"
"os/exec"
"path/filepath"
"regexp"
"syscall"
"unsafe"
"golang.org/x/sys/windows/svc"
"golang.org/x/sys/windows/svc/eventlog"
)
const name = "mackerel-agent"
const defaultEid = 1
const startEid = 2
const stopEid = 3
const loggerEid = 4
func main() {
elog, err := eventlog.Open(name)
if err != nil {
log.Fatal(err.Error())
}
defer elog.Close()
// `svc.Run` blocks until windows service will stopped.
// ref. https://msdn.microsoft.com/library/cc429362.aspx
err = svc.Run(name, &handler{elog: elog})
if err != nil {
log.Fatal(err.Error())
}
}
type handler struct {
elog *eventlog.Log
cmd *exec.Cmd
}
func (h *handler) start() error {
cmd := exec.Command(filepath.Join(filepath.Dir(execdir()), "mackerel-agent.exe"))
h.cmd = cmd
r, w := io.Pipe()
cmd.Stderr = w
scanner := bufio.NewScanner(r)
scanner.Split(bufio.ScanLines) // default
go func() {
// pipe stderr to windows event log
re := regexp.MustCompile("^\\d{4}/\\d{2}/\\d{2} \\d{2}:\\d{2}:\\d{2} (\\w+) ")
for scanner.Scan() {
line := scanner.Text()
if match := re.FindStringSubmatch(line); match != nil {
level := match[1]
switch level {
case "TRACE", "DEBUG", "INFO":
h.elog.Info(defaultEid, line)
case "WARNING":
h.elog.Warning(defaultEid, line)
case "ERROR", "CRITICAL":
h.elog.Error(defaultEid, line)
default:
h.elog.Error(defaultEid, line)
}
} else {
h.elog.Error(defaultEid, line)
}
}
if err := scanner.Err(); err != nil {
h.elog.Error(loggerEid, err.Error())
} else {
// EOF
}
}()
return cmd.Start()
}
func (h *handler) stop() error {
if h.cmd != nil && h.cmd.Process != nil {
return h.cmd.Process.Kill()
}
return nil
}
// implement https://godoc.org/golang.org/x/sys/windows/svc#Handler
func (h *handler) Execute(args []string, r <-chan svc.ChangeRequest, s chan<- svc.Status) (svcSpecificEC bool, exitCode uint32) {
s <- svc.Status{State: svc.StartPending}
defer func() {
s <- svc.Status{State: svc.Stopped}
}()
if err := h.start(); err != nil {
h.elog.Error(startEid, err.Error())
// https://msdn.microsoft.com/library/windows/desktop/ms681383(v=vs.85).aspx
// use ERROR_SERVICE_SPECIFIC_ERROR
return true, 1
}
exit := make(chan struct{})
go func() {
err := h.cmd.Wait()
// enter when the child process exited
if err != nil {
h.elog.Error(stopEid, err.Error())
}
exit <- struct{}{}
}()
s <- svc.Status{State: svc.Running, Accepts: svc.AcceptStop | svc.AcceptShutdown}
L:
for {
select {
case req := <-r:
switch req.Cmd {
case svc.Interrogate:
s <- req.CurrentStatus
case svc.Stop, svc.Shutdown:
s <- svc.Status{State: svc.StopPending, Accepts: svc.AcceptStop | svc.AcceptShutdown}
if err := h.stop(); err != nil {
h.elog.Error(stopEid, err.Error())
s <- svc.Status{State: svc.Running, Accepts: svc.AcceptStop | svc.AcceptShutdown}
}
}
case <-exit:
break L
}
}
return
}
func execdir() string {
var (
kernel32 = syscall.NewLazyDLL("kernel32")
procGetModuleFileName = kernel32.NewProc("GetModuleFileNameW")
)
var wpath [syscall.MAX_PATH]uint16
r1, _, err := procGetModuleFileName.Call(0, uintptr(unsafe.Pointer(&wpath[0])), uintptr(len(wpath)))
if r1 == 0 {
log.Fatal(err)
}
return syscall.UTF16ToString(wpath[:])
}