395 lines
11 KiB
Go
395 lines
11 KiB
Go
package main
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import (
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"context"
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"expvar"
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"fmt"
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"io"
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"net"
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"net/http"
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"os"
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"os/signal"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/anacrolix/log"
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"github.com/anacrolix/tagflag"
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"github.com/davecgh/go-spew/spew"
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"github.com/dustin/go-humanize"
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"golang.org/x/time/rate"
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"github.com/anacrolix/torrent"
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"github.com/anacrolix/torrent/iplist"
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"github.com/anacrolix/torrent/metainfo"
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pp "github.com/anacrolix/torrent/peer_protocol"
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"github.com/anacrolix/torrent/storage"
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)
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func torrentBar(t *torrent.Torrent, pieceStates bool) {
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go func() {
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start := time.Now()
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if t.Info() == nil {
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fmt.Printf("%v: getting torrent info for %q\n", time.Since(start), t.Name())
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<-t.GotInfo()
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}
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lastStats := t.Stats()
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var lastLine string
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interval := 3 * time.Second
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for range time.Tick(interval) {
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var completedPieces, partialPieces int
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psrs := t.PieceStateRuns()
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for _, r := range psrs {
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if r.Complete {
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completedPieces += r.Length
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}
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if r.Partial {
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partialPieces += r.Length
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}
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}
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stats := t.Stats()
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byteRate := int64(time.Second)
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byteRate *= stats.BytesReadUsefulData.Int64() - lastStats.BytesReadUsefulData.Int64()
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byteRate /= int64(interval)
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line := fmt.Sprintf(
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"%v: downloading %q: %s/%s, %d/%d pieces completed (%d partial): %v/s\n",
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time.Since(start),
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t.Name(),
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humanize.Bytes(uint64(t.BytesCompleted())),
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humanize.Bytes(uint64(t.Length())),
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completedPieces,
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t.NumPieces(),
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partialPieces,
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humanize.Bytes(uint64(byteRate)),
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)
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if line != lastLine {
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lastLine = line
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os.Stdout.WriteString(line)
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}
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if pieceStates {
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fmt.Println(psrs)
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}
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lastStats = stats
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}
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}()
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}
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type stringAddr string
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func (stringAddr) Network() string { return "" }
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func (me stringAddr) String() string { return string(me) }
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func resolveTestPeers(addrs []string) (ret []torrent.PeerInfo) {
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for _, ta := range addrs {
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ret = append(ret, torrent.PeerInfo{
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Addr: stringAddr(ta),
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})
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}
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return
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}
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func addTorrents(ctx context.Context, client *torrent.Client, flags downloadFlags, wg *sync.WaitGroup) error {
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testPeers := resolveTestPeers(flags.TestPeer)
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for _, arg := range flags.Torrent {
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t, err := func() (*torrent.Torrent, error) {
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if strings.HasPrefix(arg, "magnet:") {
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t, err := client.AddMagnet(arg)
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if err != nil {
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return nil, fmt.Errorf("error adding magnet: %w", err)
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}
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return t, nil
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} else if strings.HasPrefix(arg, "http://") || strings.HasPrefix(arg, "https://") {
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response, err := http.Get(arg)
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if err != nil {
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return nil, fmt.Errorf("Error downloading torrent file: %s", err)
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}
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metaInfo, err := metainfo.Load(response.Body)
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defer response.Body.Close()
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if err != nil {
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return nil, fmt.Errorf("error loading torrent file %q: %s\n", arg, err)
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}
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t, err := client.AddTorrent(metaInfo)
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if err != nil {
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return nil, fmt.Errorf("adding torrent: %w", err)
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}
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return t, nil
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} else if strings.HasPrefix(arg, "infohash:") {
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t, _ := client.AddTorrentInfoHash(metainfo.NewHashFromHex(strings.TrimPrefix(arg, "infohash:")))
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return t, nil
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} else {
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metaInfo, err := metainfo.LoadFromFile(arg)
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if err != nil {
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return nil, fmt.Errorf("error loading torrent file %q: %s\n", arg, err)
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}
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t, err := client.AddTorrent(metaInfo)
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if err != nil {
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return nil, fmt.Errorf("adding torrent: %w", err)
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}
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return t, nil
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}
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}()
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if err != nil {
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return fmt.Errorf("adding torrent for %q: %w", arg, err)
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}
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if flags.Progress {
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torrentBar(t, flags.PieceStates)
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}
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t.AddPeers(testPeers)
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wg.Add(1)
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go func() {
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defer wg.Done()
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select {
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case <-ctx.Done():
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return
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case <-t.GotInfo():
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}
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if flags.SaveMetainfos {
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path := fmt.Sprintf("%v.torrent", t.InfoHash().HexString())
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err := writeMetainfoToFile(t.Metainfo(), path)
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if err == nil {
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log.Printf("wrote %q", path)
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} else {
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log.Printf("error writing %q: %v", path, err)
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}
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}
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if len(flags.File) == 0 {
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t.DownloadAll()
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wg.Add(1)
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go func() {
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defer wg.Done()
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waitForPieces(ctx, t, 0, t.NumPieces())
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}()
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if flags.LinearDiscard {
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r := t.NewReader()
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io.Copy(io.Discard, r)
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r.Close()
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}
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} else {
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for _, f := range t.Files() {
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for _, fileArg := range flags.File {
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if f.DisplayPath() == fileArg {
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wg.Add(1)
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go func() {
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defer wg.Done()
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waitForPieces(ctx, t, f.BeginPieceIndex(), f.EndPieceIndex())
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}()
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f.Download()
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if flags.LinearDiscard {
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r := f.NewReader()
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go func() {
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defer r.Close()
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io.Copy(io.Discard, r)
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}()
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}
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}
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}
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}
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}
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}()
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}
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return nil
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}
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func waitForPieces(ctx context.Context, t *torrent.Torrent, beginIndex, endIndex int) {
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sub := t.SubscribePieceStateChanges()
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defer sub.Close()
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expected := storage.Completion{
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Complete: true,
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Ok: true,
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}
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pending := make(map[int]struct{})
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for i := beginIndex; i < endIndex; i++ {
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if t.Piece(i).State().Completion != expected {
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pending[i] = struct{}{}
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}
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}
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for {
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if len(pending) == 0 {
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return
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}
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select {
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case ev := <-sub.Values:
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if ev.Completion == expected {
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delete(pending, ev.Index)
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}
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case <-ctx.Done():
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return
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}
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}
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}
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func writeMetainfoToFile(mi metainfo.MetaInfo, path string) error {
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f, err := os.OpenFile(path, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o640)
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if err != nil {
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return err
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}
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defer f.Close()
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err = mi.Write(f)
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if err != nil {
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return err
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}
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return f.Close()
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}
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type downloadFlags struct {
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Debug bool
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DownloadCmd
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}
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type DownloadCmd struct {
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SaveMetainfos bool
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Mmap bool `help:"memory-map torrent data"`
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Seed bool `help:"seed after download is complete"`
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Addr string `help:"network listen addr"`
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MaxUnverifiedBytes *tagflag.Bytes `help:"maximum number bytes to have pending verification"`
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UploadRate *tagflag.Bytes `help:"max piece bytes to send per second"`
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DownloadRate *tagflag.Bytes `help:"max bytes per second down from peers"`
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PackedBlocklist string
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PublicIP net.IP
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Progress bool `default:"true"`
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PieceStates bool `help:"Output piece state runs at progress intervals."`
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Quiet bool `help:"discard client logging"`
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Stats bool `help:"print stats at termination"`
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Dht bool `default:"true"`
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PortForward bool `default:"true"`
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TcpPeers bool `default:"true"`
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UtpPeers bool `default:"true"`
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Webtorrent bool `default:"true"`
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DisableWebseeds bool
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// Don't progress past handshake for peer connections where the peer doesn't offer the fast
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// extension.
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RequireFastExtension bool
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Ipv4 bool `default:"true"`
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Ipv6 bool `default:"true"`
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Pex bool `default:"true"`
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LinearDiscard bool `help:"Read and discard selected regions from start to finish. Useful for testing simultaneous Reader and static file prioritization."`
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TestPeer []string `help:"addresses of some starting peers"`
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File []string
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Torrent []string `arity:"+" help:"torrent file path or magnet uri" arg:"positional"`
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}
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func statsEnabled(flags downloadFlags) bool {
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return flags.Stats
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}
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func downloadErr(flags downloadFlags) error {
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clientConfig := torrent.NewDefaultClientConfig()
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clientConfig.DisableWebseeds = flags.DisableWebseeds
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clientConfig.DisableTCP = !flags.TcpPeers
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clientConfig.DisableUTP = !flags.UtpPeers
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clientConfig.DisableIPv4 = !flags.Ipv4
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clientConfig.DisableIPv6 = !flags.Ipv6
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clientConfig.DisableAcceptRateLimiting = true
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clientConfig.NoDHT = !flags.Dht
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clientConfig.Debug = flags.Debug
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clientConfig.Seed = flags.Seed
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clientConfig.PublicIp4 = flags.PublicIP.To4()
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clientConfig.PublicIp6 = flags.PublicIP
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clientConfig.DisablePEX = !flags.Pex
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clientConfig.DisableWebtorrent = !flags.Webtorrent
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clientConfig.NoDefaultPortForwarding = !flags.PortForward
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if flags.PackedBlocklist != "" {
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blocklist, err := iplist.MMapPackedFile(flags.PackedBlocklist)
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if err != nil {
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return fmt.Errorf("loading blocklist: %v", err)
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}
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defer blocklist.Close()
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clientConfig.IPBlocklist = blocklist
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}
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if flags.Mmap {
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clientConfig.DefaultStorage = storage.NewMMap("")
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}
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if flags.Addr != "" {
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clientConfig.SetListenAddr(flags.Addr)
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}
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if flags.UploadRate != nil {
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// TODO: I think the upload rate limit could be much lower.
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clientConfig.UploadRateLimiter = rate.NewLimiter(rate.Limit(*flags.UploadRate), 256<<10)
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}
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if flags.DownloadRate != nil {
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clientConfig.DownloadRateLimiter = rate.NewLimiter(rate.Limit(*flags.DownloadRate), 1<<16)
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}
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{
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logger := log.Default.WithNames("main", "client")
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if flags.Quiet {
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logger = logger.FilterLevel(log.Critical)
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}
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clientConfig.Logger = logger
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}
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if flags.RequireFastExtension {
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clientConfig.MinPeerExtensions.SetBit(pp.ExtensionBitFast, true)
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}
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if flags.MaxUnverifiedBytes != nil {
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clientConfig.MaxUnverifiedBytes = flags.MaxUnverifiedBytes.Int64()
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}
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ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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defer cancel()
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client, err := torrent.NewClient(clientConfig)
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if err != nil {
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return fmt.Errorf("creating client: %w", err)
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}
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defer client.Close()
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// Write status on the root path on the default HTTP muxer. This will be bound to localhost
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// somewhere if GOPPROF is set, thanks to the envpprof import.
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http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
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client.WriteStatus(w)
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})
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var wg sync.WaitGroup
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err = addTorrents(ctx, client, flags, &wg)
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if err != nil {
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return fmt.Errorf("adding torrents: %w", err)
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}
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started := time.Now()
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defer outputStats(client, flags)
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wg.Wait()
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if ctx.Err() == nil {
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log.Print("downloaded ALL the torrents")
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} else {
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err = ctx.Err()
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}
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clientConnStats := client.ConnStats()
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log.Printf("average download rate: %v",
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humanize.Bytes(uint64(
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time.Duration(
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clientConnStats.BytesReadUsefulData.Int64(),
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)*time.Second/time.Since(started),
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)))
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if flags.Seed {
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if len(client.Torrents()) == 0 {
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log.Print("no torrents to seed")
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} else {
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outputStats(client, flags)
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<-ctx.Done()
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}
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}
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spew.Dump(expvar.Get("torrent").(*expvar.Map).Get("chunks received"))
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spew.Dump(client.ConnStats())
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clStats := client.ConnStats()
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sentOverhead := clStats.BytesWritten.Int64() - clStats.BytesWrittenData.Int64()
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log.Printf(
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"client read %v, %.1f%% was useful data. sent %v non-data bytes",
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humanize.Bytes(uint64(clStats.BytesRead.Int64())),
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100*float64(clStats.BytesReadUsefulData.Int64())/float64(clStats.BytesRead.Int64()),
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humanize.Bytes(uint64(sentOverhead)))
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return err
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}
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func outputStats(cl *torrent.Client, args downloadFlags) {
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if !statsEnabled(args) {
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return
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}
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expvar.Do(func(kv expvar.KeyValue) {
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fmt.Printf("%s: %s\n", kv.Key, kv.Value)
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})
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cl.WriteStatus(os.Stdout)
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}
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