/
tcp.go
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/
tcp.go
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package transport
import (
"fmt"
"net"
"sync"
"time"
ma "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multiaddr"
manet "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multiaddr-net"
reuseport "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-reuseport"
context "github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
lgbl "github.com/ipfs/go-ipfs/util/eventlog/loggables"
)
type TcpTransport struct {
dlock sync.Mutex
dialers map[string]Dialer
llock sync.Mutex
listeners map[string]Listener
}
func NewTCPTransport() *TcpTransport {
return &TcpTransport{
dialers: make(map[string]Dialer),
listeners: make(map[string]Listener),
}
}
func (t *TcpTransport) Dialer(laddr ma.Multiaddr, opts ...DialOpt) (Dialer, error) {
t.dlock.Lock()
defer t.dlock.Unlock()
s := laddr.String()
d, found := t.dialers[s]
if found {
return d, nil
}
var base manet.Dialer
var doReuse bool
for _, o := range opts {
switch o := o.(type) {
case TimeoutOpt:
base.Timeout = time.Duration(o)
case 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) (Listener, error) {
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 IsTcpMultiaddr(a)
}
type tcpDialer struct {
laddr ma.Multiaddr
doReuse bool
rd reuseport.Dialer
madialer manet.Dialer
transport Transport
}
func (t *TcpTransport) newTcpDialer(base manet.Dialer, laddr ma.Multiaddr, doReuse bool) (*tcpDialer, error) {
// get the local net.Addr manually
la, err := manet.ToNetAddr(laddr)
if err != nil {
return nil, err // something wrong with laddr.
}
if doReuse && ReuseportIsAvailable() {
rd := reuseport.Dialer{
D: net.Dialer{
LocalAddr: la,
Timeout: base.Timeout,
},
}
return &tcpDialer{
doReuse: true,
laddr: laddr,
rd: rd,
madialer: base,
transport: t,
}, nil
}
return &tcpDialer{
doReuse: false,
laddr: laddr,
madialer: base,
transport: t,
}, nil
}
func (d *tcpDialer) Dial(raddr ma.Multiaddr) (Conn, error) {
var c manet.Conn
var err error
if d.doReuse {
c, err = d.reuseDial(raddr)
} else {
c, err = d.madialer.Dial(raddr)
}
if err != nil {
return nil, err
}
return &connWrap{
Conn: c,
transport: d.transport,
}, nil
}
func (d *tcpDialer) reuseDial(raddr ma.Multiaddr) (manet.Conn, error) {
logdial := lgbl.Dial("conn", "", "", d.laddr, raddr)
rpev := log.EventBegin(context.TODO(), "tptDialReusePort", logdial)
network, netraddr, err := manet.DialArgs(raddr)
if err != nil {
return nil, err
}
con, err := d.rd.Dial(network, netraddr)
if err == nil {
logdial["reuseport"] = "success"
rpev.Done()
return manet.WrapNetConn(con)
}
if !ReuseErrShouldRetry(err) {
logdial["reuseport"] = "failure"
logdial["error"] = err
rpev.Done()
return nil, err
}
logdial["reuseport"] = "retry"
logdial["error"] = err
rpev.Done()
return d.madialer.Dial(raddr)
}
func (d *tcpDialer) Matches(a ma.Multiaddr) bool {
return IsTcpMultiaddr(a)
}
type tcpListener struct {
list manet.Listener
transport Transport
}
func (d *tcpListener) Accept() (Conn, error) {
c, err := d.list.Accept()
if err != nil {
return nil, err
}
return &connWrap{
Conn: c,
transport: 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()
}