status-go/vendor/github.com/libp2p/go-libp2p-circuit/conn.go

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package relay
import (
"fmt"
"net"
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"time"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr-net"
)
type Conn struct {
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stream network.Stream
remote peer.AddrInfo
host host.Host
}
type NetAddr struct {
Relay string
Remote string
}
func (n *NetAddr) Network() string {
return "libp2p-circuit-relay"
}
func (n *NetAddr) String() string {
return fmt.Sprintf("relay[%s-%s]", n.Remote, n.Relay)
}
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func (c *Conn) Close() error {
c.untagHop()
return c.stream.Reset()
}
func (c *Conn) Read(buf []byte) (int, error) {
return c.stream.Read(buf)
}
func (c *Conn) Write(buf []byte) (int, error) {
return c.stream.Write(buf)
}
func (c *Conn) SetDeadline(t time.Time) error {
return c.stream.SetDeadline(t)
}
func (c *Conn) SetReadDeadline(t time.Time) error {
return c.stream.SetReadDeadline(t)
}
func (c *Conn) SetWriteDeadline(t time.Time) error {
return c.stream.SetWriteDeadline(t)
}
func (c *Conn) RemoteAddr() net.Addr {
return &NetAddr{
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Relay: c.stream.Conn().RemotePeer().Pretty(),
Remote: c.remote.ID.Pretty(),
}
}
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// Increment the underlying relay connection tag by 1, thus increasing its protection from
// connection pruning. This ensures that connections to relays are not accidentally closed,
// by the connection manager, taking with them all the relayed connections (that may themselves
// be protected).
func (c *Conn) tagHop() {
c.host.ConnManager().UpsertTag(c.stream.Conn().RemotePeer(), "relay-hop-stream", incrementTag)
}
// Decrement the underlying relay connection tag by 1; this is performed when we close the
// relayed connection.
func (c *Conn) untagHop() {
c.host.ConnManager().UpsertTag(c.stream.Conn().RemotePeer(), "relay-hop-stream", decrementTag)
}
// TODO: is it okay to cast c.Conn().RemotePeer() into a multiaddr? might be "user input"
func (c *Conn) RemoteMultiaddr() ma.Multiaddr {
// TODO: We should be able to do this directly without converting to/from a string.
relayAddr, err := ma.NewComponent(
ma.ProtocolWithCode(ma.P_P2P).Name,
c.stream.Conn().RemotePeer().Pretty(),
)
if err != nil {
panic(err)
}
return ma.Join(c.stream.Conn().RemoteMultiaddr(), relayAddr, circuitAddr)
}
func (c *Conn) LocalMultiaddr() ma.Multiaddr {
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return c.stream.Conn().LocalMultiaddr()
}
func (c *Conn) LocalAddr() net.Addr {
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na, err := manet.ToNetAddr(c.stream.Conn().LocalMultiaddr())
if err != nil {
log.Error("failed to convert local multiaddr to net addr:", err)
return nil
}
return na
}