func wrapConn(psc *ps.Conn) (*Conn, error) {
// grab the underlying connection.
if _, ok := psc.NetConn().(conn.Conn); !ok {
// this should never happen. if we see it ocurring it means that we added
// a Listener to the ps.Swarm that is NOT one of our net/conn.Listener.
return nil, fmt.Errorf("swarm connHandler: invalid conn (not a conn.Conn): %s", psc)
}
return (*Conn)(psc), nil
}
// connHandler is called by the StreamSwarm whenever a new connection is added
// here we configure it slightly. Note that this is sequential, so if anything
// will take a while do it in a goroutine.
// See https://godoc.org/github.com/jbenet/go-peerstream for more information
func (s *Swarm) connHandler(c *ps.Conn) *Conn {
ctx := context.Background()
// this context is for running the handshake, which -- when receiveing connections
// -- we have no bound on beyond what the transport protocol bounds it at.
// note that setup + the handshake are bounded by underlying io.
// (i.e. if TCP or UDP disconnects (or the swarm closes), we're done.
// Q: why not have a shorter handshake? think about an HTTP server on really slow conns.
// as long as the conn is live (TCP says its online), it tries its best. we follow suit.)
sc, err := s.newConnSetup(ctx, c)
if err != nil {
log.Debug(err)
log.Event(ctx, "newConnHandlerDisconnect", lgbl.NetConn(c.NetConn()), lgbl.Error(err))
c.Close() // boom. close it.
return nil
}
// if a peer dials us, remove from dial backoff.
s.backf.Clear(sc.RemotePeer())
return sc
}