status-go/vendor/github.com/libp2p/go-libp2p-transport-upgrader/upgrader.go

143 lines
4.3 KiB
Go

package stream
import (
"context"
"errors"
"fmt"
"github.com/libp2p/go-libp2p-core/network"
"net"
"github.com/libp2p/go-libp2p-core/connmgr"
"github.com/libp2p/go-libp2p-core/mux"
"github.com/libp2p/go-libp2p-core/peer"
ipnet "github.com/libp2p/go-libp2p-core/pnet"
"github.com/libp2p/go-libp2p-core/sec"
"github.com/libp2p/go-libp2p-core/transport"
"github.com/libp2p/go-libp2p-pnet"
manet "github.com/multiformats/go-multiaddr-net"
)
// ErrNilPeer is returned when attempting to upgrade an outbound connection
// without specifying a peer ID.
var ErrNilPeer = errors.New("nil peer")
// AcceptQueueLength is the number of connections to fully setup before not accepting any new connections
var AcceptQueueLength = 16
// Upgrader is a multistream upgrader that can upgrade an underlying connection
// to a full transport connection (secure and multiplexed).
type Upgrader struct {
PSK ipnet.PSK
Secure sec.SecureTransport
Muxer mux.Multiplexer
ConnGater connmgr.ConnectionGater
}
// UpgradeListener upgrades the passed multiaddr-net listener into a full libp2p-transport listener.
func (u *Upgrader) UpgradeListener(t transport.Transport, list manet.Listener) transport.Listener {
ctx, cancel := context.WithCancel(context.Background())
l := &listener{
Listener: list,
upgrader: u,
transport: t,
threshold: newThreshold(AcceptQueueLength),
incoming: make(chan transport.CapableConn),
cancel: cancel,
ctx: ctx,
}
go l.handleIncoming()
return l
}
// UpgradeOutbound upgrades the given outbound multiaddr-net connection into a
// full libp2p-transport connection.
func (u *Upgrader) UpgradeOutbound(ctx context.Context, t transport.Transport, maconn manet.Conn, p peer.ID) (transport.CapableConn, error) {
if p == "" {
return nil, ErrNilPeer
}
return u.upgrade(ctx, t, maconn, p, network.DirOutbound)
}
// UpgradeInbound upgrades the given inbound multiaddr-net connection into a
// full libp2p-transport connection.
func (u *Upgrader) UpgradeInbound(ctx context.Context, t transport.Transport, maconn manet.Conn) (transport.CapableConn, error) {
return u.upgrade(ctx, t, maconn, "", network.DirInbound)
}
func (u *Upgrader) upgrade(ctx context.Context, t transport.Transport, maconn manet.Conn, p peer.ID, dir network.Direction) (transport.CapableConn, error) {
var conn net.Conn = maconn
if u.PSK != nil {
pconn, err := pnet.NewProtectedConn(u.PSK, conn)
if err != nil {
conn.Close()
return nil, fmt.Errorf("failed to setup private network protector: %s", err)
}
conn = pconn
} else if ipnet.ForcePrivateNetwork {
log.Error("tried to dial with no Private Network Protector but usage" +
" of Private Networks is forced by the enviroment")
return nil, ipnet.ErrNotInPrivateNetwork
}
sconn, err := u.setupSecurity(ctx, conn, p)
if err != nil {
conn.Close()
return nil, fmt.Errorf("failed to negotiate security protocol: %s", err)
}
// call the connection gater, if one is registered.
if u.ConnGater != nil && !u.ConnGater.InterceptSecured(dir, sconn.RemotePeer(), maconn) {
if err := maconn.Close(); err != nil {
log.Errorf("failed to close connection with peer %s and addr %s; err: %s",
p.Pretty(), maconn.RemoteMultiaddr(), err)
}
return nil, fmt.Errorf("gater rejected connection with peer %s and addr %s with direction %d",
sconn.RemotePeer().Pretty(), maconn.RemoteMultiaddr(), dir)
}
smconn, err := u.setupMuxer(ctx, sconn, p)
if err != nil {
sconn.Close()
return nil, fmt.Errorf("failed to negotiate stream multiplexer: %s", err)
}
tc := &transportConn{
MuxedConn: smconn,
ConnMultiaddrs: maconn,
ConnSecurity: sconn,
transport: t,
}
return tc, nil
}
func (u *Upgrader) setupSecurity(ctx context.Context, conn net.Conn, p peer.ID) (sec.SecureConn, error) {
if p == "" {
return u.Secure.SecureInbound(ctx, conn)
}
return u.Secure.SecureOutbound(ctx, conn, p)
}
func (u *Upgrader) setupMuxer(ctx context.Context, conn net.Conn, p peer.ID) (mux.MuxedConn, error) {
// TODO: The muxer should take a context.
done := make(chan struct{})
var smconn mux.MuxedConn
var err error
go func() {
defer close(done)
smconn, err = u.Muxer.NewConn(conn, p == "")
}()
select {
case <-done:
return smconn, err
case <-ctx.Done():
// interrupt this process
conn.Close()
// wait to finish
<-done
return nil, ctx.Err()
}
}