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tcp.go
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tcp.go
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package tcp
import (
"context"
"fmt"
"net"
"sync"
logging "github.com/ipfs/go-log"
tpt "github.com/libp2p/go-libp2p-transport"
reuseport "github.com/libp2p/go-reuseport"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr-net"
mafmt "github.com/whyrusleeping/mafmt"
)
var log = logging.Logger("tcp-tpt")
type TcpTransport struct {
dlock sync.Mutex
dialers map[string]tpt.Dialer
llock sync.Mutex
listeners map[string]tpt.Listener
}
var _ tpt.Transport = &TcpTransport{}
// 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() *TcpTransport {
return &TcpTransport{
dialers: make(map[string]tpt.Dialer),
listeners: make(map[string]tpt.Listener),
}
}
func (t *TcpTransport) Dialer(laddr ma.Multiaddr, opts ...tpt.DialOpt) (tpt.Dialer, error) {
if laddr == nil {
zaddr, err := ma.NewMultiaddr("/ip4/0.0.0.0/tcp/0")
if err != nil {
return nil, err
}
laddr = zaddr
}
t.dlock.Lock()
defer t.dlock.Unlock()
s := laddr.String()
d, found := t.dialers[s]
if found {
return d, nil
}
var base manet.Dialer
la, err := manet.ToNetAddr(laddr)
if err != nil {
return nil, err // something wrong with laddr.
}
base.Dialer.LocalAddr = la
var doReuse bool
for _, o := range opts {
switch o := o.(type) {
case tpt.ReuseportOpt:
doReuse = bool(o)
default:
return nil, fmt.Errorf("unrecognized option: %#v", o)
}
}
tcpd, err := t.newTcpDialer(base, laddr, doReuse)
if err != nil {
return nil, err
}
t.dialers[s] = tcpd
return tcpd, nil
}
func (t *TcpTransport) Listen(laddr ma.Multiaddr) (tpt.Listener, error) {
if !t.Matches(laddr) {
return nil, fmt.Errorf("tcp transport cannot listen on %q", laddr)
}
t.llock.Lock()
defer t.llock.Unlock()
s := laddr.String()
l, found := t.listeners[s]
if found {
return l, nil
}
list, err := manetListen(laddr)
if err != nil {
return nil, err
}
tlist := &tcpListener{
list: list,
transport: t,
}
t.listeners[s] = tlist
return tlist, nil
}
func manetListen(addr ma.Multiaddr) (manet.Listener, error) {
network, naddr, err := manet.DialArgs(addr)
if err != nil {
return nil, err
}
if ReuseportIsAvailable() {
nl, err := reuseport.Listen(network, naddr)
if err == nil {
// hey, it worked!
return manet.WrapNetListener(nl)
}
// reuseport is available, but we failed to listen. log debug, and retry normally.
log.Debugf("reuseport available, but failed to listen: %s %s, %s", network, naddr, err)
}
// either reuseport not available, or it failed. try normally.
return manet.Listen(addr)
}
func (t *TcpTransport) Matches(a ma.Multiaddr) bool {
return mafmt.TCP.Matches(a)
}
type tcpDialer struct {
laddr ma.Multiaddr
doReuse bool
rd reuseport.Dialer
madialer manet.Dialer
pattern mafmt.Pattern
transport tpt.Transport
}
var _ tpt.Dialer = &tcpDialer{}
func (t *TcpTransport) newTcpDialer(base manet.Dialer, laddr ma.Multiaddr, doReuse bool) (*tcpDialer, error) {
var pattern mafmt.Pattern
if TCP4.Matches(laddr) {
pattern = TCP4
} else if TCP6.Matches(laddr) {
pattern = TCP6
} else {
return nil, fmt.Errorf("local addr did not match TCP4 or TCP6: %s", laddr)
}
if doReuse && ReuseportIsAvailable() {
rd := reuseport.Dialer{
D: base.Dialer,
}
return &tcpDialer{
doReuse: true,
laddr: laddr,
rd: rd,
madialer: base,
transport: t,
pattern: pattern,
}, nil
}
return &tcpDialer{
doReuse: false,
laddr: laddr,
pattern: pattern,
madialer: base,
transport: t,
}, nil
}
func (d *tcpDialer) Dial(raddr ma.Multiaddr) (tpt.Conn, error) {
return d.DialContext(context.Background(), raddr)
}
func (d *tcpDialer) DialContext(ctx context.Context, raddr ma.Multiaddr) (tpt.Conn, error) {
var c manet.Conn
var err error
if d.doReuse {
c, err = d.reuseDial(ctx, raddr)
} else {
c, err = d.madialer.DialContext(ctx, raddr)
}
if err != nil {
return nil, err
}
return &tcpConn{
Conn: c,
t: d.transport,
}, nil
}
func (d *tcpDialer) reuseDial(ctx context.Context, raddr ma.Multiaddr) (manet.Conn, error) {
network, netraddr, err := manet.DialArgs(raddr)
if err != nil {
return nil, err
}
rpev := log.EventBegin(ctx, "tptDialReusePort", logging.LoggableMap{
"raddr": raddr,
})
con, err := d.rd.DialContext(ctx, network, netraddr)
if err == nil {
rpev.Done()
return manet.WrapNetConn(con)
}
rpev.SetError(err)
rpev.Done()
if !ReuseErrShouldRetry(err) {
return nil, err
}
return d.madialer.DialContext(ctx, raddr)
}
var TCP4 = mafmt.And(mafmt.Base(ma.P_IP4), mafmt.Base(ma.P_TCP))
var TCP6 = mafmt.And(mafmt.Base(ma.P_IP6), mafmt.Base(ma.P_TCP))
func (d *tcpDialer) Matches(a ma.Multiaddr) bool {
return d.pattern.Matches(a)
}
type tcpListener struct {
list manet.Listener
transport tpt.Transport
}
var _ tpt.Listener = &tcpListener{}
func (d *tcpListener) Accept() (tpt.Conn, error) {
c, err := d.list.Accept()
if err != nil {
return nil, err
}
return &tcpConn{
Conn: c,
t: d.transport,
}, nil
}
func (d *tcpListener) Addr() net.Addr {
return d.list.Addr()
}
func (t *tcpListener) Multiaddr() ma.Multiaddr {
return t.list.Multiaddr()
}
func (t *tcpListener) NetListener() net.Listener {
return t.list.NetListener()
}
func (d *tcpListener) Close() error {
return d.list.Close()
}
type tcpConn struct {
manet.Conn
t tpt.Transport
}
var _ tpt.Conn = &tcpConn{}
func (c *tcpConn) Transport() tpt.Transport {
return c.t
}