/
server.go
140 lines (119 loc) · 2.79 KB
/
server.go
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package server
import (
"errors"
"github.com/drdreyworld/siglistener"
"log"
"net"
"net/http"
"os"
"os/exec"
"syscall"
"time"
)
var err error
const (
CMD_RESTART = iota
CMD_GRACE
CMD_STOP
)
func NewServer() *server {
result := new(server)
result.server = &http.Server{}
return result
}
type server struct {
server *http.Server
listener net.Listener
stopchan chan int
stopped bool
stopcmd int
siglistener.SigListener
}
func (self *server) Server() *http.Server {
return self.server
}
func (self *server) Start(gracefulChild bool) (err error) {
self.stopchan = make(chan int, 1)
defer close(self.stopchan)
self.HandleSignal(syscall.SIGUSR1, CMD_GRACE, func(cmd siglistener.SigCommand) { LogIfError(self.Grace()) })
self.HandleSignal(syscall.SIGUSR2, CMD_RESTART, func(cmd siglistener.SigCommand) { LogIfError(self.Restart()) })
self.HandleSignal(syscall.SIGQUIT, CMD_STOP, func(cmd siglistener.SigCommand) { LogIfError(self.Stop()) })
self.ListenCommands()
if gracefulChild {
f := os.NewFile(3, "")
self.listener, err = net.FileListener(f)
} else {
self.listener, err = net.Listen("tcp", self.server.Addr)
}
if err == nil {
self.server.Serve(self.listener)
switch <-self.stopchan {
case CMD_GRACE:
time.Sleep(time.Second)
}
}
return err
}
func (self *server) Stop() (err error) {
if self.stopped {
err = errors.New("Server already stopped")
} else {
self.stopped = true
log.Println("Stop")
if err = self.listener.Close(); err == nil {
self.server = nil
self.stopchan <- CMD_STOP
}
}
return err
}
func (self *server) Restart() (err error) {
if self.stopped {
err = errors.New("Server already stopped")
} else {
self.stopped = true
log.Println("Restart")
if err = self.listener.Close(); err == nil {
args := make([]string, 0, len(os.Args)-1)
for _, arg := range os.Args[1:] {
if arg != "-grace" {
args = append(args, arg)
}
}
cmd := exec.Command(os.Args[0], args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err = cmd.Start(); err == nil {
self.stopchan <- CMD_RESTART
}
}
}
return err
}
func (self *server) Grace() (err error) {
if self.stopped {
err = errors.New("Server already stopped")
} else {
self.stopped = true
log.Println("Graceful restart")
if err = self.listener.Close(); err == nil {
if file, err := self.listener.(*net.TCPListener).File(); err == nil {
args := make([]string, 0, len(os.Args))
for _, arg := range os.Args[1:] {
if arg != "-grace" {
args = append(args, arg)
}
}
args = append(args, "-grace")
cmd := exec.Command(os.Args[0], args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.ExtraFiles = []*os.File{file}
if err = cmd.Start(); err == nil {
self.stopchan <- CMD_GRACE
}
}
}
}
return err
}