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 // 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         if *init {
  86                 if _, err := os.Stat(filepath.Join(*configDir, "/config.yaml")); os.IsNotExist(err) {
  87                         if err := os.MkdirAll(*configDir, 0750); err != nil {
  88                                 slogger.Error(fmt.Sprintf("error creating config dir: %s", err))
  89                                 os.Exit(1)
  90                         }
  91
  92                         if err := copyDir("mobius/config", *configDir); err != nil {
  93                                 slogger.Error(fmt.Sprintf("error copying config dir: %s", err))
  94                                 os.Exit(1)
  95                         }
  96                         slogger.Info("Config dir initialized at " + *configDir)
  97                 } else {
  98                         slogger.Info("Existing config dir found.  Skipping initialization.")
  99                 }
 100         }
 101
 102         if _, err := os.Stat(*configDir); os.IsNotExist(err) {
 103                 slogger.Error("Configuration directory not found.  Correct the path or re-run with -init to generate initial config.")
 104                 os.Exit(1)
 105         }
 106
 107         srv, err := hotline.NewServer(*configDir, *netInterface, *basePort, slogger, &hotline.OSFileStore{})
 108         if err != nil {
 109                 slogger.Error(fmt.Sprintf("Error starting server: %s", err))
 110                 os.Exit(1)
 111         }
 112
 113         sh := statHandler{hlServer: srv}
 114         if *statsPort != "" {
 115                 http.HandleFunc("/", sh.RenderStats)
 116
 117                 go func(srv *hotline.Server) {
 118                         // Use the default DefaultServeMux.
 119                         err = http.ListenAndServe(":"+*statsPort, nil)
 120                         if err != nil {
 121                                 log.Fatal(err)
 122                         }
 123                 }(srv)
 124         }
 125
 126         slogger.Info("Hotline server started",
 127                 "version", version,
 128                 "API port", fmt.Sprintf("%s:%v", *netInterface, *basePort),
 129                 "Transfer port", fmt.Sprintf("%s:%v", *netInterface, *basePort+1),
 130         )
 131
 132         // Serve Hotline requests until program exit
 133         log.Fatal(srv.ListenAndServe(ctx))
 134 }
 135
 136 type statHandler struct {
 137         hlServer *hotline.Server
 138 }
 139
 140 func (sh *statHandler) RenderStats(w http.ResponseWriter, _ *http.Request) {
 141         u, err := json.Marshal(sh.hlServer.CurrentStats())
 142         if err != nil {
 143                 panic(err)
 144         }
 145
 146         _, _ = io.WriteString(w, string(u))
 147 }
 148
 149 func defaultConfigPath() string {
 150         var cfgPath string
 151
 152         switch runtime.GOOS {
 153         case "windows":
 154                 cfgPath = "config/"
 155         case "darwin":
 156                 if _, err := os.Stat("/usr/local/var/mobius/config/"); err == nil {
 157                         cfgPath = "/usr/local/var/mobius/config/"
 158                 } else if _, err := os.Stat("/opt/homebrew/var/mobius/config"); err == nil {
 159                         cfgPath = "/opt/homebrew/var/mobius/config/"
 160                 }
 161         case "linux":
 162                 cfgPath = "/usr/local/var/mobius/config/"
 163         default:
 164                 cfgPath = "./config/"
 165         }
 166
 167         return cfgPath
 168 }
 169
 170 // copyFile copies a file from src to dst. If dst does not exist, it is created.
 171 func copyFile(src, dst string) error {
 172         sourceFile, err := os.Open(src)
 173         if err != nil {
 174                 return err
 175         }
 176         defer sourceFile.Close()
 177
 178         destinationFile, err := os.Create(dst)
 179         if err != nil {
 180                 return err
 181         }
 182         defer destinationFile.Close()
 183
 184         _, err = io.Copy(destinationFile, sourceFile)
 185         return err
 186 }
 187
 188 // copyDir recursively copies a directory tree, attempting to preserve permissions.
 189 func copyDir(src, dst string) error {
 190         entries, err := cfgTemplate.ReadDir(src)
 191         if err != nil {
 192                 return err
 193         }
 194         for _, dirEntry := range entries {
 195                 if dirEntry.IsDir() {
 196                         if err := os.MkdirAll(filepath.Join(dst, dirEntry.Name()), 0777); err != nil {
 197                                 panic(err)
 198                         }
 199                         subdirEntries, _ := cfgTemplate.ReadDir(filepath.Join(src, dirEntry.Name()))
 200                         for _, subDirEntry := range subdirEntries {
 201                                 f, err := os.Create(filepath.Join(dst, dirEntry.Name(), subDirEntry.Name()))
 202                                 if err != nil {
 203                                         return err
 204                                 }
 205
 206                                 srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name(), subDirEntry.Name()))
 207                                 if err != nil {
 208                                         return err
 209                                 }
 210                                 _, err = io.Copy(f, srcFile)
 211                                 if err != nil {
 212                                         return err
 213                                 }
 214                                 f.Close()
 215                         }
 216                 } else {
 217                         f, err := os.Create(filepath.Join(dst, dirEntry.Name()))
 218                         if err != nil {
 219                                 return err
 220                         }
 221
 222                         srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name()))
 223                         if err != nil {
 224                                 return err
 225                         }
 226                         _, err = io.Copy(f, srcFile)
 227                         if err != nil {
 228                                 return err
 229                         }
 230                         f.Close()
 231                 }
 232         }
 233
 234         return nil
 235 }