90 lines
1.6 KiB
Go
90 lines
1.6 KiB
Go
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package udp
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import (
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"context"
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"log"
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"net"
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"github.com/anacrolix/dht/v2/krpc"
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"github.com/anacrolix/missinggo/v2"
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)
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type NewConnClientOpts struct {
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Network string
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Host string
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Ipv6 *bool
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}
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type ConnClient struct {
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cl Client
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conn net.Conn
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d Dispatcher
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readErr error
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ipv6 bool
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}
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func (cc *ConnClient) reader() {
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for {
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b := make([]byte, 0x800)
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n, err := cc.conn.Read(b)
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if err != nil {
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// TODO: Do bad things to the dispatcher, and incoming calls to the client if we have a
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// read error.
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cc.readErr = err
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break
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}
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err = cc.d.Dispatch(b[:n])
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if err != nil {
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log.Printf("dispatching packet received on %v: %v", cc.conn, err)
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}
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}
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}
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func ipv6(opt *bool, network string, conn net.Conn) bool {
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if opt != nil {
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return *opt
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}
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switch network {
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case "udp4":
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return false
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case "udp6":
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return true
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}
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rip := missinggo.AddrIP(conn.RemoteAddr())
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return rip.To16() != nil && rip.To4() == nil
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}
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func NewConnClient(opts NewConnClientOpts) (cc ConnClient, err error) {
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cc.conn, err = net.Dial(opts.Network, opts.Host)
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if err != nil {
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return
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}
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cc.ipv6 = ipv6(opts.Ipv6, opts.Network, cc.conn)
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go cc.reader()
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cc.cl = Client{
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Dispatcher: &cc.d,
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Writer: cc.conn,
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}
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return
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}
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func (c *ConnClient) Close() error {
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return c.conn.Close()
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}
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func (c *ConnClient) Announce(
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ctx context.Context, req AnnounceRequest, opts Options,
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) (
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h AnnounceResponseHeader, nas AnnounceResponsePeers, err error,
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) {
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nas = func() AnnounceResponsePeers {
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if c.ipv6 {
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return &krpc.CompactIPv6NodeAddrs{}
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} else {
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return &krpc.CompactIPv4NodeAddrs{}
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}
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}()
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h, err = c.cl.Announce(ctx, req, nas, opts)
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return
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}
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