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 func main() {
  32         ctx, cancel := context.WithCancel(context.Background())
  33
  34         // TODO: implement graceful shutdown by closing context
  35         // c := make(chan os.Signal, 1)
  36         // signal.Notify(c, os.Interrupt)
  37         // defer func() {
  38         //      signal.Stop(c)
  39         //      cancel()
  40         // }()
  41         // go func() {
  42         //      select {
  43         //      case <-c:
  44         //              cancel()
  45         //      case <-ctx.Done():
  46         //      }
  47         // }()
  48
  49         netInterface := flag.String("interface", "", "IP addr of interface to listen on.  Defaults to all interfaces.")
  50         basePort := flag.Int("bind", defaultPort, "Base Hotline server port.  File transfer port is base port + 1.")
  51         statsPort := flag.String("stats-port", "", "Enable stats HTTP endpoint on address and port")
  52         configDir := flag.String("config", defaultConfigPath(), "Path to config root")
  53         version := flag.Bool("version", false, "print version and exit")
  54         logLevel := flag.String("log-level", "info", "Log level")
  55         logFile := flag.String("log-file", "", "Path to log file")
  56
  57         init := flag.Bool("init", false, "Populate the config dir with default configuration")
  58
  59         flag.Parse()
  60
  61         if *version {
  62                 fmt.Printf("v%s\n", hotline.VERSION)
  63                 os.Exit(0)
  64         }
  65
  66         slogger := slog.New(
  67                 slog.NewTextHandler(
  68                         io.MultiWriter(os.Stdout, &lumberjack.Logger{
  69                                 Filename:   *logFile,
  70                                 MaxSize:    100, // MB
  71                                 MaxBackups: 3,
  72                                 MaxAge:     365, // days
  73                         }),
  74                         &slog.HandlerOptions{Level: logLevels[*logLevel]},
  75                 ),
  76         )
  77
  78         if *init {
  79                 if _, err := os.Stat(filepath.Join(*configDir, "/config.yaml")); os.IsNotExist(err) {
  80                         if err := os.MkdirAll(*configDir, 0750); err != nil {
  81                                 slogger.Error(fmt.Sprintf("error creating config dir: %s", err))
  82                                 os.Exit(1)
  83                         }
  84
  85                         if err := copyDir("mobius/config", *configDir); err != nil {
  86                                 slogger.Error(fmt.Sprintf("error copying config dir: %s", err))
  87                                 os.Exit(1)
  88                         }
  89                         slogger.Info("Config dir initialized at " + *configDir)
  90                 } else {
  91                         slogger.Info("Existing config dir found.  Skipping initialization.")
  92                 }
  93         }
  94
  95         if _, err := os.Stat(*configDir); os.IsNotExist(err) {
  96                 slogger.Error(fmt.Sprintf("Configuration directory not found.  Correct the path or re-run with -init to generate initial config."))
  97                 os.Exit(1)
  98         }
  99
 100         srv, err := hotline.NewServer(*configDir, *netInterface, *basePort, slogger, &hotline.OSFileStore{})
 101         if err != nil {
 102                 slogger.Error(fmt.Sprintf("Error starting server: %s", err))
 103                 os.Exit(1)
 104         }
 105
 106         sh := statHandler{hlServer: srv}
 107         if *statsPort != "" {
 108                 http.HandleFunc("/", sh.RenderStats)
 109
 110                 go func(srv *hotline.Server) {
 111                         // Use the default DefaultServeMux.
 112                         err = http.ListenAndServe(":"+*statsPort, nil)
 113                         if err != nil {
 114                                 log.Fatal(err)
 115                         }
 116                 }(srv)
 117         }
 118
 119         // Serve Hotline requests until program exit
 120         log.Fatal(srv.ListenAndServe(ctx, cancel))
 121 }
 122
 123 type statHandler struct {
 124         hlServer *hotline.Server
 125 }
 126
 127 func (sh *statHandler) RenderStats(w http.ResponseWriter, _ *http.Request) {
 128         u, err := json.Marshal(sh.hlServer.CurrentStats())
 129         if err != nil {
 130                 panic(err)
 131         }
 132
 133         _, _ = io.WriteString(w, string(u))
 134 }
 135
 136 func defaultConfigPath() (cfgPath string) {
 137         switch runtime.GOOS {
 138         case "windows":
 139                 cfgPath = "config/"
 140         case "darwin":
 141                 if _, err := os.Stat("/usr/local/var/mobius/config/"); err == nil {
 142                         cfgPath = "/usr/local/var/mobius/config/"
 143                 } else if _, err := os.Stat("/opt/homebrew/var/mobius/config"); err == nil {
 144                         cfgPath = "/opt/homebrew/var/mobius/config/"
 145                 }
 146         case "linux":
 147                 cfgPath = "/usr/local/var/mobius/config/"
 148         default:
 149                 cfgPath = "./config/"
 150         }
 151
 152         return cfgPath
 153 }
 154
 155 // TODO: Simplify this mess.  Why is it so difficult to recursively copy a directory?
 156 func copyDir(src, dst string) error {
 157         entries, err := cfgTemplate.ReadDir(src)
 158         if err != nil {
 159                 return err
 160         }
 161         for _, dirEntry := range entries {
 162                 if dirEntry.IsDir() {
 163                         if err := os.MkdirAll(filepath.Join(dst, dirEntry.Name()), 0777); err != nil {
 164                                 panic(err)
 165                         }
 166                         subdirEntries, _ := cfgTemplate.ReadDir(filepath.Join(src, dirEntry.Name()))
 167                         for _, subDirEntry := range subdirEntries {
 168                                 f, err := os.Create(filepath.Join(dst, dirEntry.Name(), subDirEntry.Name()))
 169                                 if err != nil {
 170                                         return err
 171                                 }
 172
 173                                 srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name(), subDirEntry.Name()))
 174                                 if err != nil {
 175                                         return err
 176                                 }
 177                                 _, err = io.Copy(f, srcFile)
 178                                 if err != nil {
 179                                         return err
 180                                 }
 181                                 f.Close()
 182                         }
 183                 } else {
 184                         f, err := os.Create(filepath.Join(dst, dirEntry.Name()))
 185                         if err != nil {
 186                                 return err
 187                         }
 188
 189                         srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name()))
 190                         if err != nil {
 191                                 return err
 192                         }
 193                         _, err = io.Copy(f, srcFile)
 194                         if err != nil {
 195                                 return err
 196                         }
 197                         f.Close()
 198                 }
 199         }
 200
 201         return nil
 202 }