forked from mackerelio/mackerel-agent
/
wrapper_windows.go
289 lines (257 loc) · 6.19 KB
/
wrapper_windows.go
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package main
import (
"bufio"
"bytes"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"regexp"
"sync"
"syscall"
"time"
"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
var (
kernel32 = syscall.NewLazyDLL("kernel32")
procAllocConsole = kernel32.NewProc("AllocConsole")
procGenerateConsoleCtrlEvent = kernel32.NewProc("GenerateConsoleCtrlEvent")
)
func main() {
if len(os.Args) == 2 {
var err error
switch os.Args[1] {
case "install":
err = installService("mackerel-agent", "mackerel agent")
case "remove":
err = removeService("mackerel-agent")
}
if err != nil {
log.Fatal(err)
}
return
}
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 logger interface {
Info(eid uint32, msg string) error
Warning(eid uint32, msg string) error
Error(eid uint32, msg string) error
}
type handler struct {
elog logger
cmd *exec.Cmd
r io.Reader
w io.WriteCloser
wg sync.WaitGroup
}
// ex.
// verbose log: 2017/01/21 22:21:08 command.go:434: DEBUG <command> received 'immediate' chan
// normal log: 2017/01/24 14:14:27 INFO <main> Starting mackerel-agent version:0.36.0
var logRe = regexp.MustCompile(`^\d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2} (?:\S+\.go:\d+: )?([A-Z]+) `)
func (h *handler) retire() error {
dir := execdir()
cmd := exec.Command(filepath.Join(dir, "mackerel-agent.exe"), "retire", "--force")
cmd.Dir = dir
return cmd.Run()
}
func (h *handler) start() error {
procAllocConsole.Call()
dir := execdir()
cmd := exec.Command(filepath.Join(dir, "mackerel-agent.exe"))
cmd.SysProcAttr = &syscall.SysProcAttr{
CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
}
cmd.Dir = dir
h.cmd = cmd
h.r, h.w = io.Pipe()
cmd.Stderr = h.w
err := h.cmd.Start()
if err != nil {
return err
}
return h.aggregate()
}
func (h *handler) aggregate() error {
br := bufio.NewReader(h.r)
lc := make(chan string, 10)
done := make(chan struct{})
// It need to read data from pipe continuously. And it need to close handle
// when process finished.
// read data from pipe. When data arrived at EOL, send line-string to the
// channel. Also remaining line to EOF.
h.wg.Add(1)
go func() {
defer h.wg.Done()
defer h.w.Close()
// pipe stderr to windows event log
var body bytes.Buffer
for {
b, err := br.ReadByte()
if err != nil {
if err != io.EOF {
h.elog.Error(loggerEid, err.Error())
}
break
}
if b == '\n' {
if body.Len() > 0 {
lc <- body.String()
body.Reset()
}
continue
}
body.WriteByte(b)
}
if body.Len() > 0 {
lc <- body.String()
}
done <- struct{}{}
}()
h.wg.Add(1)
go func() {
defer h.wg.Done()
linebuf := []string{}
loop:
for {
select {
case line := <-lc:
if len(linebuf) == 0 || logRe.MatchString(line) {
linebuf = append(linebuf, line)
} else {
linebuf[len(linebuf)-1] += "\n" + line
}
case <-time.After(10 * time.Millisecond):
// When it take 10ms, it is located at end of paragraph. Then
// slice appended at above should be the paragraph.
for _, line := range linebuf {
if match := logRe.FindStringSubmatch(line); match != nil {
level := match[1]
switch level {
case "TRACE", "DEBUG", "INFO":
h.elog.Info(defaultEid, line)
case "WARNING", "ERROR":
h.elog.Warning(defaultEid, line)
case "CRITICAL":
h.elog.Error(defaultEid, line)
default:
h.elog.Error(defaultEid, line)
}
} else {
h.elog.Error(defaultEid, line)
}
}
select {
case <-done:
break loop
default:
}
linebuf = nil
}
}
close(lc)
close(done)
}()
return nil
}
func interrupt(p *os.Process) error {
r1, _, err := procGenerateConsoleCtrlEvent.Call(syscall.CTRL_BREAK_EVENT, uintptr(p.Pid))
if r1 == 0 {
return err
}
return nil
}
func (h *handler) stop() error {
if h.cmd != nil && h.cmd.Process != nil {
err := interrupt(h.cmd.Process)
if err == nil {
end := time.Now().Add(10 * time.Second)
for time.Now().Before(end) {
if h.cmd.ProcessState != nil && h.cmd.ProcessState.Exited() {
return nil
}
time.Sleep(1 * time.Second)
}
}
return h.cmd.Process.Kill()
}
h.wg.Wait()
return nil
}
func autoRetire() bool {
env := os.Getenv("MACKEREL_AUTO_RETIREMENT")
return env != "" && env != "0"
}
// 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}
} else {
if req.Cmd == svc.Shutdown && autoRetire() {
if err := h.retire(); err != nil {
h.elog.Error(stopEid, err.Error())
s <- svc.Status{State: svc.Running, Accepts: svc.AcceptShutdown}
}
}
}
}
case <-exit:
break L
}
}
return
}
func execdir() string {
p, err := os.Executable()
if err != nil {
log.Fatal(err)
}
return filepath.Dir(p)
}