Golang FileRecord.Leechers方法代码示例

// Announce announces using UDP format
func (u UDPTracker) Announce(query url.Values, file data.FileRecord) []byte {
	// Create UDP announce response
	announce := udp.AnnounceResponse{
		Action:   1,
		TransID:  u.TransID,
		Interval: uint32(common.Static.Config.Interval),
		Leechers: uint32(file.Leechers()),
		Seeders:  uint32(file.Seeders()),
	}

	// Convert to UDP byte buffer
	announceBuf, err := announce.MarshalBinary()
	if err != nil {
		log.Println(err.Error())
		return u.Error("Could not create UDP announce response")
	}

	// Numwant
	numwant, err := strconv.Atoi(query.Get("numwant"))
	if err != nil {
		numwant = 50
	}

	// Add compact peer list
	res := bytes.NewBuffer(announceBuf)
	err = binary.Write(res, binary.BigEndian, file.PeerList(query.Get("ip"), numwant))
	if err != nil {
		log.Println(err.Error())
		return u.Error("Could not create UDP announce response")
	}

	return res.Bytes()
}

// Announce announces using HTTP format
func (h HTTPTracker) Announce(query url.Values, file data.FileRecord) []byte {
	// Generate response struct
	announce := AnnounceResponse{
		Interval:    common.Static.Config.Interval,
		MinInterval: common.Static.Config.Interval / 2,
	}

	// Get seeders count on file
	var err error
	announce.Complete, err = file.Seeders()
	if err != nil {
		log.Println(err.Error())
	}

	// Get leechers count on file
	announce.Incomplete, err = file.Leechers()
	if err != nil {
		log.Println(err.Error())
	}

	// Check for numwant parameter, return up to that number of peers
	// Default is 50 per protocol
	numwant := 50
	if query.Get("numwant") != "" {
		// Verify numwant is an integer
		num, err := strconv.Atoi(query.Get("numwant"))
		if err == nil {
			numwant = num
		}
	}

	// Marshal struct into bencode
	buf := bytes.NewBuffer(make([]byte, 0))
	if err := bencode.Marshal(buf, announce); err != nil {
		log.Println(err.Error())
		return h.Error(ErrAnnounceFailure.Error())
	}

	// Generate compact peer list of length numwant
	// Note: because we are HTTP, we can mark second parameter as 'true' to get a
	// more accurate peer list
	compactPeers, err := file.CompactPeerList(numwant, true)
	if err != nil {
		log.Println(err.Error())
		return h.Error(ErrPeerListFailure.Error())
	}

	// Because the bencode marshaler does not handle compact, binary peer list conversion,
	// we handle it manually here.

	// Get initial buffer, chop off 3 bytes: "0:e", append the actual list length with new colon
	out := buf.Bytes()
	out = append(out[0:len(out)-3], []byte(strconv.Itoa(len(compactPeers))+":")...)

	// Append peers list, terminate with an "e"
	return append(append(out, compactPeers...), byte('e'))
}

// Announce announces using UDP format
func (u UDPTracker) Announce(query url.Values, file data.FileRecord) []byte {
	// Create UDP announce response
	announce := udp.AnnounceResponse{
		Action:   1,
		TransID:  u.TransID,
		Interval: uint32(common.Static.Config.Interval),
	}

	// Calculate file seeders and leechers
	seeders, err := file.Seeders()
	if err != nil {
		log.Println(err.Error())
	}
	announce.Seeders = uint32(seeders)

	leechers, err := file.Leechers()
	if err != nil {
		log.Println(err.Error())
	}
	announce.Leechers = uint32(leechers)

	// Convert to UDP byte buffer
	announceBuf, err := announce.MarshalBinary()
	if err != nil {
		log.Println(err.Error())
		return u.Error(ErrAnnounceFailure.Error())
	}

	// Numwant
	numwant, err := strconv.Atoi(query.Get("numwant"))
	if err != nil {
		numwant = 50
	}

	// Retrieve compact peer list
	// Note: because we are UDP, we send the second parameter 'false' to get
	// a "best guess" peer list, due to anonymous announces
	peers, err := file.CompactPeerList(numwant, false)
	if err != nil {
		log.Println(err.Error())
		return u.Error(ErrPeerListFailure.Error())
	}

	// Add compact peer list
	res := bytes.NewBuffer(announceBuf)
	err = binary.Write(res, binary.BigEndian, peers)
	if err != nil {
		log.Println(err.Error())
		return u.Error(ErrPeerListFailure.Error())
	}

	return res.Bytes()
}

// Announce announces using HTTP format
func (h HTTPTracker) Announce(query url.Values, file data.FileRecord) []byte {
	// Generate response struct
	announce := AnnounceResponse{
		Complete:    file.Seeders(),
		Incomplete:  file.Leechers(),
		Interval:    common.Static.Config.Interval,
		MinInterval: common.Static.Config.Interval / 2,
	}

	// Check for numwant parameter, return up to that number of peers
	// Default is 50 per protocol
	numwant := 50
	if query.Get("numwant") != "" {
		// Verify numwant is an integer
		num, err := strconv.Atoi(query.Get("numwant"))
		if err == nil {
			numwant = num
		}
	}

	// Marshal struct into bencode
	buf := bytes.NewBuffer(make([]byte, 0))
	if err := bencode.Marshal(buf, announce); err != nil {
		log.Println(err.Error())
		return h.Error("Tracker error: failed to create announce response")
	}

	// Generate compact peer list of length numwant, exclude this user
	peers := file.PeerList(query.Get("ip"), numwant)

	// Because the bencode marshaler does not handle compact, binary peer list conversion,
	// we handle it manually here.

	// Get initial buffer, chop off 3 bytes: "0:e", append the actual list length with new colon
	out := buf.Bytes()
	out = append(out[0:len(out)-3], []byte(strconv.Itoa(len(peers))+":")...)

	// Append peers list, terminate with an "e"
	out = append(append(out, peers...), byte('e'))

	// Return final announce message
	return out
}