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"
  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 // Values swapped in by go-releaser at build time
  32 var (
  33         version = "dev"
  34         commit  = "none"
  35         date    = "unknown"
  36 )
  37
  38 func main() {
  39         ctx, _ := context.WithCancel(context.Background())
  40
  41         // TODO: implement graceful shutdown by closing context
  42         //c := make(chan os.Signal, 1)
  43         //signal.Notify(c, os.Interrupt)
  44         //defer func() {
  45         //      signal.Stop(c)
  46         //      cancel()
  47         //}()
  48         //go func() {
  49         //      select {
  50         //      case <-c:
  51         //              cancel()
  52         //      case <-ctx.Done():
  53         //      }
  54         //}()
  55
  56         netInterface := flag.String("interface", "", "IP addr of interface to listen on.  Defaults to all interfaces.")
  57         basePort := flag.Int("bind", defaultPort, "Base Hotline server port.  File transfer port is base port + 1.")
  58         statsPort := flag.String("stats-port", "", "Enable stats HTTP endpoint on address and port")
  59         configDir := flag.String("config", defaultConfigPath(), "Path to config root")
  60         printVersion := flag.Bool("version", false, "print version and exit")
  61         logLevel := flag.String("log-level", "info", "Log level")
  62         logFile := flag.String("log-file", "", "Path to log file")
  63
  64         init := flag.Bool("init", false, "Populate the config dir with default configuration")
  65
  66         flag.Parse()
  67
  68         if *printVersion {
  69                 fmt.Printf("mobius-hotline-server %s, commit %s, built at %s", version, commit, date)
  70                 os.Exit(0)
  71         }
  72
  73         slogger := slog.New(
  74                 slog.NewTextHandler(
  75                         io.MultiWriter(os.Stdout, &lumberjack.Logger{
  76                                 Filename:   *logFile,
  77                                 MaxSize:    100, // MB
  78                                 MaxBackups: 3,
  79                                 MaxAge:     365, // days
  80                         }),
  81                         &slog.HandlerOptions{Level: logLevels[*logLevel]},
  82                 ),
  83         )
  84
  85         // It's important for Windows compatibility to use path.Join and not filepath.Join for the config dir initialization.
  86         // https://github.com/golang/go/issues/44305
  87         if *init {
  88                 if _, err := os.Stat(path.Join(*configDir, "/config.yaml")); os.IsNotExist(err) {
  89                         if err := os.MkdirAll(*configDir, 0750); err != nil {
  90                                 slogger.Error(fmt.Sprintf("error creating config dir: %s", err))
  91                                 os.Exit(1)
  92                         }
  93                         if err := copyDir(path.Join("mobius", "config"), *configDir); err != nil {
  94                                 slogger.Error(fmt.Sprintf("error copying config dir: %s", err))
  95                                 os.Exit(1)
  96                         }
  97                         slogger.Info("Config dir initialized at " + *configDir)
  98                 } else {
  99                         slogger.Info("Existing config dir found.  Skipping initialization.")
 100                 }
 101         }
 102
 103         if _, err := os.Stat(*configDir); os.IsNotExist(err) {
 104                 slogger.Error("Configuration directory not found.  Correct the path or re-run with -init to generate initial config.")
 105                 os.Exit(1)
 106         }
 107
 108         srv, err := hotline.NewServer(*configDir, *netInterface, *basePort, slogger, &hotline.OSFileStore{})
 109         if err != nil {
 110                 slogger.Error(fmt.Sprintf("Error starting server: %s", err))
 111                 os.Exit(1)
 112         }
 113
 114         sh := statHandler{hlServer: srv}
 115         if *statsPort != "" {
 116                 http.HandleFunc("/", sh.RenderStats)
 117
 118                 go func(srv *hotline.Server) {
 119                         // Use the default DefaultServeMux.
 120                         err = http.ListenAndServe(":"+*statsPort, nil)
 121                         if err != nil {
 122                                 log.Fatal(err)
 123                         }
 124                 }(srv)
 125         }
 126
 127         slogger.Info("Hotline server started",
 128                 "version", version,
 129                 "API port", fmt.Sprintf("%s:%v", *netInterface, *basePort),
 130                 "Transfer port", fmt.Sprintf("%s:%v", *netInterface, *basePort+1),
 131         )
 132
 133         // Serve Hotline requests until program exit
 134         log.Fatal(srv.ListenAndServe(ctx))
 135 }
 136
 137 type statHandler struct {
 138         hlServer *hotline.Server
 139 }
 140
 141 func (sh *statHandler) RenderStats(w http.ResponseWriter, _ *http.Request) {
 142         u, err := json.Marshal(sh.hlServer.CurrentStats())
 143         if err != nil {
 144                 panic(err)
 145         }
 146
 147         _, _ = io.WriteString(w, string(u))
 148 }
 149
 150 func defaultConfigPath() string {
 151         var cfgPath string
 152
 153         switch runtime.GOOS {
 154         case "windows":
 155                 cfgPath = "config/"
 156         case "darwin":
 157                 if _, err := os.Stat("/usr/local/var/mobius/config/"); err == nil {
 158                         cfgPath = "/usr/local/var/mobius/config/"
 159                 } else if _, err := os.Stat("/opt/homebrew/var/mobius/config"); err == nil {
 160                         cfgPath = "/opt/homebrew/var/mobius/config/"
 161                 }
 162         case "linux":
 163                 cfgPath = "/usr/local/var/mobius/config/"
 164         default:
 165                 cfgPath = "./config/"
 166         }
 167
 168         return cfgPath
 169 }
 170
 171 // copyFile copies a file from src to dst. If dst does not exist, it is created.
 172 func copyFile(src, dst string) error {
 173         sourceFile, err := os.Open(src)
 174         if err != nil {
 175                 return err
 176         }
 177         defer sourceFile.Close()
 178
 179         destinationFile, err := os.Create(dst)
 180         if err != nil {
 181                 return err
 182         }
 183         defer destinationFile.Close()
 184
 185         _, err = io.Copy(destinationFile, sourceFile)
 186         return err
 187 }
 188
 189 // copyDir recursively copies a directory tree, attempting to preserve permissions.
 190 func copyDir(src, dst string) error {
 191         entries, err := cfgTemplate.ReadDir(src)
 192         if err != nil {
 193                 return err
 194         }
 195         for _, dirEntry := range entries {
 196                 if dirEntry.IsDir() {
 197                         if err := os.MkdirAll(path.Join(dst, dirEntry.Name()), 0777); err != nil {
 198                                 panic(err)
 199                         }
 200                         subdirEntries, _ := cfgTemplate.ReadDir(path.Join(src, dirEntry.Name()))
 201                         for _, subDirEntry := range subdirEntries {
 202                                 f, err := os.Create(path.Join(dst, dirEntry.Name(), subDirEntry.Name()))
 203                                 if err != nil {
 204                                         return err
 205                                 }
 206
 207                                 srcFile, err := cfgTemplate.Open(path.Join(src, dirEntry.Name(), subDirEntry.Name()))
 208                                 if err != nil {
 209                                         return fmt.Errorf("error copying srcFile: %w", err)
 210                                 }
 211                                 _, err = io.Copy(f, srcFile)
 212                                 if err != nil {
 213                                         return err
 214                                 }
 215                                 f.Close()
 216                         }
 217                 } else {
 218                         f, err := os.Create(path.Join(dst, dirEntry.Name()))
 219                         if err != nil {
 220                                 return err
 221                         }
 222
 223                         srcFile, err := cfgTemplate.Open(path.Join(src, dirEntry.Name()))
 224                         if err != nil {
 225                                 return err
 226                         }
 227                         _, err = io.Copy(f, srcFile)
 228                         if err != nil {
 229                                 return err
 230                         }
 231                         f.Close()
 232                 }
 233         }
 234
 235         return nil
 236 }