cmd/torrent/main.go

   1 // Downloads torrents from the command-line.
   2 package main
   3
   4 import (
   5         "expvar"
   6         "fmt"
   7         "io"
   8         stdLog "log"
   9         "net"
  10         "net/http"
  11         "os"
  12         "os/signal"
  13         "strings"
  14         "syscall"
  15         "time"
  16
  17         "github.com/alexflint/go-arg"
  18         "github.com/anacrolix/missinggo"
  19         "github.com/anacrolix/torrent/bencode"
  20         "github.com/davecgh/go-spew/spew"
  21         "github.com/dustin/go-humanize"
  22         "golang.org/x/xerrors"
  23
  24         "github.com/anacrolix/log"
  25
  26         "github.com/anacrolix/envpprof"
  27         "github.com/anacrolix/tagflag"
  28         "golang.org/x/time/rate"
  29
  30         "github.com/anacrolix/torrent"
  31         "github.com/anacrolix/torrent/iplist"
  32         "github.com/anacrolix/torrent/metainfo"
  33         "github.com/anacrolix/torrent/storage"
  34 )
  35
  36 func torrentBar(t *torrent.Torrent, pieceStates bool) {
  37         go func() {
  38                 start := time.Now()
  39                 if t.Info() == nil {
  40                         fmt.Printf("%v: getting torrent info for %q\n", time.Since(start), t.Name())
  41                         <-t.GotInfo()
  42                 }
  43                 lastStats := t.Stats()
  44                 var lastLine string
  45                 for range time.Tick(time.Second) {
  46                         var completedPieces, partialPieces int
  47                         psrs := t.PieceStateRuns()
  48                         for _, r := range psrs {
  49                                 if r.Complete {
  50                                         completedPieces += r.Length
  51                                 }
  52                                 if r.Partial {
  53                                         partialPieces += r.Length
  54                                 }
  55                         }
  56                         stats := t.Stats()
  57                         line := fmt.Sprintf(
  58                                 "%v: downloading %q: %s/%s, %d/%d pieces completed (%d partial): %v/s\n",
  59                                 time.Since(start),
  60                                 t.Name(),
  61                                 humanize.Bytes(uint64(t.BytesCompleted())),
  62                                 humanize.Bytes(uint64(t.Length())),
  63                                 completedPieces,
  64                                 t.NumPieces(),
  65                                 partialPieces,
  66                                 humanize.Bytes(uint64(stats.BytesReadUsefulData.Int64()-lastStats.BytesReadUsefulData.Int64())),
  67                         )
  68                         if line != lastLine {
  69                                 lastLine = line
  70                                 os.Stdout.WriteString(line)
  71                         }
  72                         if pieceStates {
  73                                 fmt.Println(psrs)
  74                         }
  75                         lastStats = stats
  76                 }
  77         }()
  78 }
  79
  80 type stringAddr string
  81
  82 func (stringAddr) Network() string   { return "" }
  83 func (me stringAddr) String() string { return string(me) }
  84
  85 func resolveTestPeers(addrs []string) (ret []torrent.PeerInfo) {
  86         for _, ta := range flags.TestPeer {
  87                 ret = append(ret, torrent.PeerInfo{
  88                         Addr: stringAddr(ta),
  89                 })
  90         }
  91         return
  92 }
  93
  94 func addTorrents(client *torrent.Client) error {
  95         testPeers := resolveTestPeers(flags.TestPeer)
  96         for _, arg := range flags.Torrent {
  97                 t, err := func() (*torrent.Torrent, error) {
  98                         if strings.HasPrefix(arg, "magnet:") {
  99                                 t, err := client.AddMagnet(arg)
 100                                 if err != nil {
 101                                         return nil, xerrors.Errorf("error adding magnet: %w", err)
 102                                 }
 103                                 return t, nil
 104                         } else if strings.HasPrefix(arg, "http://") || strings.HasPrefix(arg, "https://") {
 105                                 response, err := http.Get(arg)
 106                                 if err != nil {
 107                                         return nil, xerrors.Errorf("Error downloading torrent file: %s", err)
 108                                 }
 109
 110                                 metaInfo, err := metainfo.Load(response.Body)
 111                                 defer response.Body.Close()
 112                                 if err != nil {
 113                                         return nil, xerrors.Errorf("error loading torrent file %q: %s\n", arg, err)
 114                                 }
 115                                 t, err := client.AddTorrent(metaInfo)
 116                                 if err != nil {
 117                                         return nil, xerrors.Errorf("adding torrent: %w", err)
 118                                 }
 119                                 return t, nil
 120                         } else if strings.HasPrefix(arg, "infohash:") {
 121                                 t, _ := client.AddTorrentInfoHash(metainfo.NewHashFromHex(strings.TrimPrefix(arg, "infohash:")))
 122                                 return t, nil
 123                         } else {
 124                                 metaInfo, err := metainfo.LoadFromFile(arg)
 125                                 if err != nil {
 126                                         return nil, xerrors.Errorf("error loading torrent file %q: %s\n", arg, err)
 127                                 }
 128                                 t, err := client.AddTorrent(metaInfo)
 129                                 if err != nil {
 130                                         return nil, xerrors.Errorf("adding torrent: %w", err)
 131                                 }
 132                                 return t, nil
 133                         }
 134                 }()
 135                 if err != nil {
 136                         return xerrors.Errorf("adding torrent for %q: %w", arg, err)
 137                 }
 138                 if flags.Progress {
 139                         torrentBar(t, flags.PieceStates)
 140                 }
 141                 t.AddPeers(testPeers)
 142                 go func() {
 143                         <-t.GotInfo()
 144                         if len(flags.File) == 0 {
 145                                 t.DownloadAll()
 146                         } else {
 147                                 for _, f := range t.Files() {
 148                                         for _, fileArg := range flags.File {
 149                                                 if f.DisplayPath() == fileArg {
 150                                                         f.Download()
 151                                                 }
 152                                         }
 153                                 }
 154                         }
 155                 }()
 156         }
 157         return nil
 158 }
 159
 160 var flags struct {
 161         Debug bool
 162
 163         *DownloadCmd      `arg:"subcommand:download"`
 164         *ListFilesCmd     `arg:"subcommand:list-files"`
 165         *SpewBencodingCmd `arg:"subcommand:spew-bencoding"`
 166         *AnnounceCmd      `arg:"subcommand:announce"`
 167 }
 168
 169 type SpewBencodingCmd struct{}
 170
 171 type DownloadCmd struct {
 172         Mmap            bool           `help:"memory-map torrent data"`
 173         TestPeer        []string       `help:"addresses of some starting peers"`
 174         Seed            bool           `help:"seed after download is complete"`
 175         Addr            string         `help:"network listen addr"`
 176         UploadRate      *tagflag.Bytes `help:"max piece bytes to send per second"`
 177         DownloadRate    *tagflag.Bytes `help:"max bytes per second down from peers"`
 178         PackedBlocklist string
 179         PublicIP        net.IP
 180         Progress        bool `default:"true"`
 181         PieceStates     bool
 182         Quiet           bool  `help:"discard client logging"`
 183         Stats           *bool `help:"print stats at termination"`
 184         Dht             bool  `default:"true"`
 185
 186         TcpPeers        bool `default:"true"`
 187         UtpPeers        bool `default:"true"`
 188         Webtorrent      bool `default:"true"`
 189         DisableWebseeds bool
 190
 191         Ipv4 bool `default:"true"`
 192         Ipv6 bool `default:"true"`
 193         Pex  bool `default:"true"`
 194
 195         File    []string
 196         Torrent []string `arity:"+" help:"torrent file path or magnet uri" arg:"positional"`
 197 }
 198
 199 type ListFilesCmd struct {
 200         TorrentPath string `arg:"positional"`
 201 }
 202
 203 func stdoutAndStderrAreSameFile() bool {
 204         fi1, _ := os.Stdout.Stat()
 205         fi2, _ := os.Stderr.Stat()
 206         return os.SameFile(fi1, fi2)
 207 }
 208
 209 func statsEnabled() bool {
 210         if flags.Stats == nil {
 211                 return flags.Debug
 212         }
 213         return *flags.Stats
 214 }
 215
 216 func exitSignalHandlers(notify *missinggo.SynchronizedEvent) {
 217         c := make(chan os.Signal, 1)
 218         signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
 219         for {
 220                 log.Printf("close signal received: %+v", <-c)
 221                 notify.Set()
 222         }
 223 }
 224
 225 func main() {
 226         if err := mainErr(); err != nil {
 227                 log.Printf("error in main: %v", err)
 228                 os.Exit(1)
 229         }
 230 }
 231
 232 func mainErr() error {
 233         stdLog.SetFlags(stdLog.Flags() | stdLog.Lshortfile)
 234         p := arg.MustParse(&flags)
 235         switch {
 236         case flags.AnnounceCmd != nil:
 237                 return announceErr()
 238         //case :
 239         //      return announceErr(flags.Args, parser)
 240         case flags.DownloadCmd != nil:
 241                 return downloadErr()
 242         case flags.ListFilesCmd != nil:
 243                 mi, err := metainfo.LoadFromFile(flags.ListFilesCmd.TorrentPath)
 244                 if err != nil {
 245                         return fmt.Errorf("loading from file %q: %v", flags.ListFilesCmd.TorrentPath, err)
 246                 }
 247                 info, err := mi.UnmarshalInfo()
 248                 if err != nil {
 249                         return fmt.Errorf("unmarshalling info from metainfo at %q: %v", flags.ListFilesCmd.TorrentPath, err)
 250                 }
 251                 for _, f := range info.UpvertedFiles() {
 252                         fmt.Println(f.DisplayPath(&info))
 253                 }
 254                 return nil
 255         case flags.SpewBencodingCmd != nil:
 256                 d := bencode.NewDecoder(os.Stdin)
 257                 for i := 0; ; i++ {
 258                         var v interface{}
 259                         err := d.Decode(&v)
 260                         if err == io.EOF {
 261                                 break
 262                         }
 263                         if err != nil {
 264                                 return fmt.Errorf("decoding message index %d: %w", i, err)
 265                         }
 266                         spew.Dump(v)
 267                 }
 268                 return nil
 269         default:
 270                 p.Fail(fmt.Sprintf("unexpected subcommand: %v", p.Subcommand()))
 271                 panic("unreachable")
 272         }
 273 }
 274
 275 func downloadErr() error {
 276         defer envpprof.Stop()
 277         clientConfig := torrent.NewDefaultClientConfig()
 278         clientConfig.DisableWebseeds = flags.DisableWebseeds
 279         clientConfig.DisableTCP = !flags.TcpPeers
 280         clientConfig.DisableUTP = !flags.UtpPeers
 281         clientConfig.DisableIPv4 = !flags.Ipv4
 282         clientConfig.DisableIPv6 = !flags.Ipv6
 283         clientConfig.DisableAcceptRateLimiting = true
 284         clientConfig.NoDHT = !flags.Dht
 285         clientConfig.Debug = flags.Debug
 286         clientConfig.Seed = flags.Seed
 287         clientConfig.PublicIp4 = flags.PublicIP
 288         clientConfig.PublicIp6 = flags.PublicIP
 289         clientConfig.DisablePEX = !flags.Pex
 290         clientConfig.DisableWebtorrent = !flags.Webtorrent
 291         if flags.PackedBlocklist != "" {
 292                 blocklist, err := iplist.MMapPackedFile(flags.PackedBlocklist)
 293                 if err != nil {
 294                         return xerrors.Errorf("loading blocklist: %v", err)
 295                 }
 296                 defer blocklist.Close()
 297                 clientConfig.IPBlocklist = blocklist
 298         }
 299         if flags.Mmap {
 300                 clientConfig.DefaultStorage = storage.NewMMap("")
 301         }
 302         if flags.Addr != "" {
 303                 clientConfig.SetListenAddr(flags.Addr)
 304         }
 305         if flags.UploadRate != nil {
 306                 clientConfig.UploadRateLimiter = rate.NewLimiter(rate.Limit(*flags.UploadRate), 256<<10)
 307         }
 308         if flags.DownloadRate != nil {
 309                 clientConfig.DownloadRateLimiter = rate.NewLimiter(rate.Limit(*flags.DownloadRate), 1<<20)
 310         }
 311         if flags.Quiet {
 312                 clientConfig.Logger = log.Discard
 313         }
 314
 315         var stop missinggo.SynchronizedEvent
 316         defer func() {
 317                 stop.Set()
 318         }()
 319
 320         client, err := torrent.NewClient(clientConfig)
 321         if err != nil {
 322                 return xerrors.Errorf("creating client: %v", err)
 323         }
 324         defer client.Close()
 325         go exitSignalHandlers(&stop)
 326         go func() {
 327                 <-stop.C()
 328                 client.Close()
 329         }()
 330
 331         // Write status on the root path on the default HTTP muxer. This will be bound to localhost
 332         // somewhere if GOPPROF is set, thanks to the envpprof import.
 333         http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
 334                 client.WriteStatus(w)
 335         })
 336         err = addTorrents(client)
 337         if err != nil {
 338                 return fmt.Errorf("adding torrents: %w", err)
 339         }
 340         defer outputStats(client)
 341         if client.WaitAll() {
 342                 log.Print("downloaded ALL the torrents")
 343         } else {
 344                 return xerrors.New("y u no complete torrents?!")
 345         }
 346         if flags.Seed {
 347                 outputStats(client)
 348                 <-stop.C()
 349         }
 350         return nil
 351 }
 352
 353 func outputStats(cl *torrent.Client) {
 354         if !statsEnabled() {
 355                 return
 356         }
 357         expvar.Do(func(kv expvar.KeyValue) {
 358                 fmt.Printf("%s: %s\n", kv.Key, kv.Value)
 359         })
 360         cl.WriteStatus(os.Stdout)
 361 }