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|
package server
import (
"bufio"
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/hachem-wtf/benson/internal/config"
)
const (
stopTimeout = 60 * time.Second
pingTimeout = 2 * time.Second
)
type Status struct {
Running bool
PID int
Reachable bool
Version string
MOTD string
Players int
MaxPlayers int
Address string
}
func pidPath(cfg *config.Config) string {
return filepath.Join(cfg.ServerLocation, "benson-server.pid")
}
func LogPath(cfg *config.Config) string {
return filepath.Join(cfg.ServerLocation, "benson-server.log")
}
func javaCmd(cfg *config.Config) string {
if cfg.JavaPath != "" {
return cfg.JavaPath
}
return "java"
}
func readPID(cfg *config.Config) (int, bool) {
data, err := os.ReadFile(pidPath(cfg))
if err != nil {
return 0, false
}
pid, err := strconv.Atoi(strings.TrimSpace(string(data)))
if err != nil {
return 0, false
}
return pid, true
}
func Running(cfg *config.Config) (int, bool) {
pid, ok := readPID(cfg)
if !ok {
return 0, false
}
if !isAlive(pid) {
os.Remove(pidPath(cfg))
return 0, false
}
return pid, true
}
func Start(cfg *config.Config) (int, error) {
if cfg.ServerLocation == "" {
return 0, errors.New("server_location must be set in config")
}
if pid, ok := Running(cfg); ok {
return 0, fmt.Errorf("server already running (pid %d)", pid)
}
jar := filepath.Join(cfg.ServerLocation, "server.jar")
if _, err := os.Stat(jar); err != nil {
return 0, errors.New("no server.jar in server_location — run generate and merge first")
}
eula := filepath.Join(cfg.ServerLocation, "eula.txt")
if _, err := os.Stat(eula); os.IsNotExist(err) {
if err := os.WriteFile(eula, []byte("eula=true\n"), 0o644); err != nil {
return 0, err
}
}
logFile, err := os.Create(LogPath(cfg))
if err != nil {
return 0, err
}
defer logFile.Close()
cmd := exec.Command(javaCmd(cfg), "-jar", "server.jar", "nogui")
cmd.Dir = cfg.ServerLocation
cmd.Stdout = logFile
cmd.Stderr = logFile
cmd.SysProcAttr = detachAttr()
if err := cmd.Start(); err != nil {
return 0, err
}
pid := cmd.Process.Pid
if err := os.WriteFile(pidPath(cfg), []byte(strconv.Itoa(pid)+"\n"), 0o644); err != nil {
return pid, err
}
go cmd.Wait()
return pid, nil
}
func Stop(cfg *config.Config, progress func(string)) error {
pid, ok := Running(cfg)
if !ok {
return errors.New("server is not running")
}
progress(fmt.Sprintf("Sending stop signal to pid %d…", pid))
if err := signalStop(pid); err != nil {
return err
}
progress("Waiting for the server to save and shut down…")
deadline := time.Now().Add(stopTimeout)
for time.Now().Before(deadline) {
if !isAlive(pid) {
os.Remove(pidPath(cfg))
return nil
}
time.Sleep(500 * time.Millisecond)
}
progress("Timed out — forcing shutdown…")
forceKill(pid)
os.Remove(pidPath(cfg))
return nil
}
func Restart(cfg *config.Config, progress func(string)) error {
if _, ok := Running(cfg); ok {
if err := Stop(cfg, progress); err != nil {
return err
}
time.Sleep(1 * time.Second)
}
pid, err := Start(cfg)
if err != nil {
return err
}
progress(fmt.Sprintf("Server started (pid %d).", pid))
return nil
}
func GetStatus(cfg *config.Config) Status {
pid, running := Running(cfg)
port := serverPort(cfg)
s := Status{
Running: running,
PID: pid,
Address: fmt.Sprintf("localhost:%d", port),
}
if ping, err := pingServer("localhost", port, pingTimeout); err == nil {
s.Reachable = true
s.Version = ping.Version.Name
s.Players = ping.Players.Online
s.MaxPlayers = ping.Players.Max
s.MOTD = ping.motdText()
}
return s
}
func serverPort(cfg *config.Config) int {
f, err := os.Open(filepath.Join(cfg.ServerLocation, "server.properties"))
if err != nil {
return 25565
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if value, ok := strings.CutPrefix(line, "server-port="); ok {
if port, err := strconv.Atoi(strings.TrimSpace(value)); err == nil {
return port
}
}
}
return 25565
}
|
