git.r.bdr.sh - rbdr/mobius/blob - cmd/mobius-hotline-server/main.go

   1 package main
   2
   3 import (
   4         "context"
   5         "embed"
   6         "encoding/json"
   7         "flag"
   8         "fmt"
   9         "github.com/jhalter/mobius/hotline"
  10         "gopkg.in/natefinch/lumberjack.v2"
  11         "io"
  12         "log"
  13         "log/slog"
  14         "net/http"
  15         "os"
  16         "path/filepath"
  17         "runtime"
  18 )
  19
  20 //go:embed mobius/config
  21 var cfgTemplate embed.FS
  22
  23 const defaultPort = 5500
  24
  25 var logLevels = map[string]slog.Level{
  26         "debug": slog.LevelDebug,
  27         "info":  slog.LevelInfo,
  28         "error": slog.LevelError,
  29 }
  30
  31 var (
  32         version = "dev"
  33         commit  = "none"
  34         date    = "unknown"
  35 )
  36
  37 func main() {
  38         ctx, cancel := context.WithCancel(context.Background())
  39
  40         // TODO: implement graceful shutdown by closing context
  41         // c := make(chan os.Signal, 1)
  42         // signal.Notify(c, os.Interrupt)
  43         // defer func() {
  44         //      signal.Stop(c)
  45         //      cancel()
  46         // }()
  47         // go func() {
  48         //      select {
  49         //      case <-c:
  50         //              cancel()
  51         //      case <-ctx.Done():
  52         //      }
  53         // }()
  54
  55         netInterface := flag.String("interface", "", "IP addr of interface to listen on.  Defaults to all interfaces.")
  56         basePort := flag.Int("bind", defaultPort, "Base Hotline server port.  File transfer port is base port + 1.")
  57         statsPort := flag.String("stats-port", "", "Enable stats HTTP endpoint on address and port")
  58         configDir := flag.String("config", defaultConfigPath(), "Path to config root")
  59         printVersion := flag.Bool("version", false, "print version and exit")
  60         logLevel := flag.String("log-level", "info", "Log level")
  61         logFile := flag.String("log-file", "", "Path to log file")
  62
  63         init := flag.Bool("init", false, "Populate the config dir with default configuration")
  64
  65         flag.Parse()
  66
  67         if *printVersion {
  68                 fmt.Printf("mobius-hotline-server %s, commit %s, built at %s", version, commit, date)
  69                 os.Exit(0)
  70         }
  71
  72         slogger := slog.New(
  73                 slog.NewTextHandler(
  74                         io.MultiWriter(os.Stdout, &lumberjack.Logger{
  75                                 Filename:   *logFile,
  76                                 MaxSize:    100, // MB
  77                                 MaxBackups: 3,
  78                                 MaxAge:     365, // days
  79                         }),
  80                         &slog.HandlerOptions{Level: logLevels[*logLevel]},
  81                 ),
  82         )
  83
  84         if *init {
  85                 if _, err := os.Stat(filepath.Join(*configDir, "/config.yaml")); os.IsNotExist(err) {
  86                         if err := os.MkdirAll(*configDir, 0750); err != nil {
  87                                 slogger.Error(fmt.Sprintf("error creating config dir: %s", err))
  88                                 os.Exit(1)
  89                         }
  90
  91                         if err := copyDir("mobius/config", *configDir); err != nil {
  92                                 slogger.Error(fmt.Sprintf("error copying config dir: %s", err))
  93                                 os.Exit(1)
  94                         }
  95                         slogger.Info("Config dir initialized at " + *configDir)
  96                 } else {
  97                         slogger.Info("Existing config dir found.  Skipping initialization.")
  98                 }
  99         }
 100
 101         if _, err := os.Stat(*configDir); os.IsNotExist(err) {
 102                 slogger.Error(fmt.Sprintf("Configuration directory not found.  Correct the path or re-run with -init to generate initial config."))
 103                 os.Exit(1)
 104         }
 105
 106         srv, err := hotline.NewServer(*configDir, *netInterface, *basePort, slogger, &hotline.OSFileStore{})
 107         if err != nil {
 108                 slogger.Error(fmt.Sprintf("Error starting server: %s", err))
 109                 os.Exit(1)
 110         }
 111
 112         sh := statHandler{hlServer: srv}
 113         if *statsPort != "" {
 114                 http.HandleFunc("/", sh.RenderStats)
 115
 116                 go func(srv *hotline.Server) {
 117                         // Use the default DefaultServeMux.
 118                         err = http.ListenAndServe(":"+*statsPort, nil)
 119                         if err != nil {
 120                                 log.Fatal(err)
 121                         }
 122                 }(srv)
 123         }
 124
 125         slogger.Info("Hotline server started",
 126                 "version", version,
 127                 "API port", fmt.Sprintf("%s:%v", *netInterface, *basePort),
 128                 "Transfer port", fmt.Sprintf("%s:%v", *netInterface, *basePort+1),
 129         )
 130
 131         // Serve Hotline requests until program exit
 132         log.Fatal(srv.ListenAndServe(ctx, cancel))
 133 }
 134
 135 type statHandler struct {
 136         hlServer *hotline.Server
 137 }
 138
 139 func (sh *statHandler) RenderStats(w http.ResponseWriter, _ *http.Request) {
 140         u, err := json.Marshal(sh.hlServer.CurrentStats())
 141         if err != nil {
 142                 panic(err)
 143         }
 144
 145         _, _ = io.WriteString(w, string(u))
 146 }
 147
 148 func defaultConfigPath() (cfgPath string) {
 149         switch runtime.GOOS {
 150         case "windows":
 151                 cfgPath = "config/"
 152         case "darwin":
 153                 if _, err := os.Stat("/usr/local/var/mobius/config/"); err == nil {
 154                         cfgPath = "/usr/local/var/mobius/config/"
 155                 } else if _, err := os.Stat("/opt/homebrew/var/mobius/config"); err == nil {
 156                         cfgPath = "/opt/homebrew/var/mobius/config/"
 157                 }
 158         case "linux":
 159                 cfgPath = "/usr/local/var/mobius/config/"
 160         default:
 161                 cfgPath = "./config/"
 162         }
 163
 164         return cfgPath
 165 }
 166
 167 // TODO: Simplify this mess.  Why is it so difficult to recursively copy a directory?
 168 func copyDir(src, dst string) error {
 169         entries, err := cfgTemplate.ReadDir(src)
 170         if err != nil {
 171                 return err
 172         }
 173         for _, dirEntry := range entries {
 174                 if dirEntry.IsDir() {
 175                         if err := os.MkdirAll(filepath.Join(dst, dirEntry.Name()), 0777); err != nil {
 176                                 panic(err)
 177                         }
 178                         subdirEntries, _ := cfgTemplate.ReadDir(filepath.Join(src, dirEntry.Name()))
 179                         for _, subDirEntry := range subdirEntries {
 180                                 f, err := os.Create(filepath.Join(dst, dirEntry.Name(), subDirEntry.Name()))
 181                                 if err != nil {
 182                                         return err
 183                                 }
 184
 185                                 srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name(), subDirEntry.Name()))
 186                                 if err != nil {
 187                                         return err
 188                                 }
 189                                 _, err = io.Copy(f, srcFile)
 190                                 if err != nil {
 191                                         return err
 192                                 }
 193                                 f.Close()
 194                         }
 195                 } else {
 196                         f, err := os.Create(filepath.Join(dst, dirEntry.Name()))
 197                         if err != nil {
 198                                 return err
 199                         }
 200
 201                         srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name()))
 202                         if err != nil {
 203                                 return err
 204                         }
 205                         _, err = io.Copy(f, srcFile)
 206                         if err != nil {
 207                                 return err
 208                         }
 209                         f.Close()
 210                 }
 211         }
 212
 213         return nil
 214 }