ceremonyclient/go-libp2p/p2p/transport/tcp/tcp.go

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package tcp
import (
"context"
"errors"
"net"
"os"
"runtime"
"syscall"
"time"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/transport"
"github.com/libp2p/go-libp2p/p2p/net/reuseport"
logging "github.com/ipfs/go-log/v2"
ma "github.com/multiformats/go-multiaddr"
mafmt "github.com/multiformats/go-multiaddr-fmt"
manet "github.com/multiformats/go-multiaddr/net"
)
const defaultConnectTimeout = 5 * time.Second
var log = logging.Logger("tcp-tpt")
const keepAlivePeriod = 30 * time.Second
type canKeepAlive interface {
SetKeepAlive(bool) error
SetKeepAlivePeriod(time.Duration) error
}
var _ canKeepAlive = &net.TCPConn{}
func tryKeepAlive(conn net.Conn, keepAlive bool) {
keepAliveConn, ok := conn.(canKeepAlive)
if !ok {
log.Errorf("Can't set TCP keepalives.")
return
}
if err := keepAliveConn.SetKeepAlive(keepAlive); err != nil {
// Sometimes we seem to get "invalid argument" results from this function on Darwin.
// This might be due to a closed connection, but I can't reproduce that on Linux.
//
// But there's nothing we can do about invalid arguments, so we'll drop this to a
// debug.
if errors.Is(err, os.ErrInvalid) || errors.Is(err, syscall.EINVAL) {
log.Debugw("failed to enable TCP keepalive", "error", err)
} else {
log.Errorw("failed to enable TCP keepalive", "error", err)
}
return
}
if runtime.GOOS != "openbsd" {
if err := keepAliveConn.SetKeepAlivePeriod(keepAlivePeriod); err != nil {
log.Errorw("failed set keepalive period", "error", err)
}
}
}
// try to set linger on the connection, if possible.
func tryLinger(conn net.Conn, sec int) {
type canLinger interface {
SetLinger(int) error
}
if lingerConn, ok := conn.(canLinger); ok {
_ = lingerConn.SetLinger(sec)
}
}
type tcpListener struct {
manet.Listener
sec int
}
func (ll *tcpListener) Accept() (manet.Conn, error) {
c, err := ll.Listener.Accept()
if err != nil {
return nil, err
}
tryLinger(c, ll.sec)
tryKeepAlive(c, true)
// We're not calling OpenConnection in the resource manager here,
// since the manet.Conn doesn't allow us to save the scope.
// It's the caller's (usually the p2p/net/upgrader) responsibility
// to call the resource manager.
return c, nil
}
type Option func(*TcpTransport) error
func DisableReuseport() Option {
return func(tr *TcpTransport) error {
tr.disableReuseport = true
return nil
}
}
func WithConnectionTimeout(d time.Duration) Option {
return func(tr *TcpTransport) error {
tr.connectTimeout = d
return nil
}
}
func WithMetrics() Option {
return func(tr *TcpTransport) error {
tr.enableMetrics = true
return nil
}
}
// TcpTransport is the TCP transport.
type TcpTransport struct {
// Connection upgrader for upgrading insecure stream connections to
// secure multiplex connections.
upgrader transport.Upgrader
disableReuseport bool // Explicitly disable reuseport.
enableMetrics bool
// TCP connect timeout
connectTimeout time.Duration
rcmgr network.ResourceManager
reuse reuseport.Transport
}
var _ transport.Transport = &TcpTransport{}
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var _ transport.DialUpdater = &TcpTransport{}
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// NewTCPTransport creates a tcp transport object that tracks dialers and listeners
// created. It represents an entire TCP stack (though it might not necessarily be).
func NewTCPTransport(upgrader transport.Upgrader, rcmgr network.ResourceManager, opts ...Option) (*TcpTransport, error) {
if rcmgr == nil {
rcmgr = &network.NullResourceManager{}
}
tr := &TcpTransport{
upgrader: upgrader,
connectTimeout: defaultConnectTimeout, // can be set by using the WithConnectionTimeout option
rcmgr: rcmgr,
}
for _, o := range opts {
if err := o(tr); err != nil {
return nil, err
}
}
return tr, nil
}
var dialMatcher = mafmt.And(mafmt.IP, mafmt.Base(ma.P_TCP))
// CanDial returns true if this transport believes it can dial the given
// multiaddr.
func (t *TcpTransport) CanDial(addr ma.Multiaddr) bool {
return dialMatcher.Matches(addr)
}
func (t *TcpTransport) maDial(ctx context.Context, raddr ma.Multiaddr) (manet.Conn, error) {
// Apply the deadline iff applicable
if t.connectTimeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, t.connectTimeout)
defer cancel()
}
if t.UseReuseport() {
return t.reuse.DialContext(ctx, raddr)
}
var d manet.Dialer
return d.DialContext(ctx, raddr)
}
// Dial dials the peer at the remote address.
func (t *TcpTransport) Dial(ctx context.Context, raddr ma.Multiaddr, p peer.ID) (transport.CapableConn, error) {
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return t.DialWithUpdates(ctx, raddr, p, nil)
}
func (t *TcpTransport) DialWithUpdates(ctx context.Context, raddr ma.Multiaddr, p peer.ID, updateChan chan<- transport.DialUpdate) (transport.CapableConn, error) {
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connScope, err := t.rcmgr.OpenConnection(network.DirOutbound, true, raddr)
if err != nil {
log.Debugw("resource manager blocked outgoing connection", "peer", p, "addr", raddr, "error", err)
return nil, err
}
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c, err := t.dialWithScope(ctx, raddr, p, connScope, updateChan)
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if err != nil {
connScope.Done()
return nil, err
}
return c, nil
}
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func (t *TcpTransport) dialWithScope(ctx context.Context, raddr ma.Multiaddr, p peer.ID, connScope network.ConnManagementScope, updateChan chan<- transport.DialUpdate) (transport.CapableConn, error) {
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if err := connScope.SetPeer(p); err != nil {
log.Debugw("resource manager blocked outgoing connection for peer", "peer", p, "addr", raddr, "error", err)
return nil, err
}
conn, err := t.maDial(ctx, raddr)
if err != nil {
return nil, err
}
// Set linger to 0 so we never get stuck in the TIME-WAIT state. When
// linger is 0, connections are _reset_ instead of closed with a FIN.
// This means we can immediately reuse the 5-tuple and reconnect.
tryLinger(conn, 0)
tryKeepAlive(conn, true)
c := conn
if t.enableMetrics {
var err error
c, err = newTracingConn(conn, true)
if err != nil {
return nil, err
}
}
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if updateChan != nil {
select {
case updateChan <- transport.DialUpdate{Kind: transport.UpdateKindHandshakeProgressed, Addr: raddr}:
default:
// It is better to skip the update than to delay upgrading the connection
}
}
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direction := network.DirOutbound
if ok, isClient, _ := network.GetSimultaneousConnect(ctx); ok && !isClient {
direction = network.DirInbound
}
return t.upgrader.Upgrade(ctx, t, c, direction, p, connScope)
}
// UseReuseport returns true if reuseport is enabled and available.
func (t *TcpTransport) UseReuseport() bool {
return !t.disableReuseport && ReuseportIsAvailable()
}
func (t *TcpTransport) maListen(laddr ma.Multiaddr) (manet.Listener, error) {
if t.UseReuseport() {
return t.reuse.Listen(laddr)
}
return manet.Listen(laddr)
}
// Listen listens on the given multiaddr.
func (t *TcpTransport) Listen(laddr ma.Multiaddr) (transport.Listener, error) {
list, err := t.maListen(laddr)
if err != nil {
return nil, err
}
if t.enableMetrics {
list = newTracingListener(&tcpListener{list, 0})
}
return t.upgrader.UpgradeListener(t, list), nil
}
// Protocols returns the list of terminal protocols this transport can dial.
func (t *TcpTransport) Protocols() []int {
return []int{ma.P_TCP}
}
// Proxy always returns false for the TCP transport.
func (t *TcpTransport) Proxy() bool {
return false
}
func (t *TcpTransport) String() string {
return "TCP"
}