// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import (
"fmt"
"internal/testenv"
"io"
"os"
"reflect"
"runtime"
"sync"
"testing"
"time"
)
func BenchmarkTCP4OneShot(b *testing.B) {
benchmarkTCP(b, false, false, "127.0.0.1:0")
}
func BenchmarkTCP4OneShotTimeout(b *testing.B) {
benchmarkTCP(b, false, true, "127.0.0.1:0")
}
func BenchmarkTCP4Persistent(b *testing.B) {
benchmarkTCP(b, true, false, "127.0.0.1:0")
}
func BenchmarkTCP4PersistentTimeout(b *testing.B) {
benchmarkTCP(b, true, true, "127.0.0.1:0")
}
func BenchmarkTCP6OneShot(b *testing.B) {
if !supportsIPv6() {
b.Skip("ipv6 is not supported")
}
benchmarkTCP(b, false, false, "[::1]:0")
}
func BenchmarkTCP6OneShotTimeout(b *testing.B) {
if !supportsIPv6() {
b.Skip("ipv6 is not supported")
}
benchmarkTCP(b, false, true, "[::1]:0")
}
func BenchmarkTCP6Persistent(b *testing.B) {
if !supportsIPv6() {
b.Skip("ipv6 is not supported")
}
benchmarkTCP(b, true, false, "[::1]:0")
}
func BenchmarkTCP6PersistentTimeout(b *testing.B) {
if !supportsIPv6() {
b.Skip("ipv6 is not supported")
}
benchmarkTCP(b, true, true, "[::1]:0")
}
func benchmarkTCP(b *testing.B, persistent, timeout bool, laddr string) {
testHookUninstaller.Do(uninstallTestHooks)
const msgLen = 512
conns := b.N
numConcurrent := runtime.GOMAXPROCS(-1) * 2
msgs := 1
if persistent {
conns = numConcurrent
msgs = b.N / conns
if msgs == 0 {
msgs = 1
}
if conns > b.N {
conns = b.N
}
}
sendMsg := func(c Conn, buf []byte) bool {
n, err := c.Write(buf)
if n != len(buf) || err != nil {
b.Log(err)
return false
}
return true
}
recvMsg := func(c Conn, buf []byte) bool {
for read := 0; read != len(buf); {
n, err := c.Read(buf)
read += n
if err != nil {
b.Log(err)
return false
}
}
return true
}
ln, err := Listen("tcp", laddr)
if err != nil {
b.Fatal(err)
}
defer ln.Close()
serverSem := make(chan bool, numConcurrent)
// Acceptor.
go func() {
for {
c, err := ln.Accept()
if err != nil {
break
}
serverSem <- true
// Server connection.
go func(c Conn) {
defer func() {
c.Close()
<-serverSem
}()
if timeout {
c.SetDeadline(time.Now().Add(time.Hour)) // Not intended to fire.
}
var buf [msgLen]byte
for m := 0; m < msgs; m++ {
if !recvMsg(c, buf[:]) || !sendMsg(c, buf[:]) {
break
}
}
}(c)
}
}()
clientSem := make(chan bool, numConcurrent)
for i := 0; i < conns; i++ {
clientSem <- true
// Client connection.
go func() {
defer func() {
<-clientSem
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
b.Log(err)
return
}
defer c.Close()
if timeout {
c.SetDeadline(time.Now().Add(time.Hour)) // Not intended to fire.
}
var buf [msgLen]byte
for m := 0; m < msgs; m++ {
if !sendMsg(c, buf[:]) || !recvMsg(c, buf[:]) {
break
}
}
}()
}
for i := 0; i < numConcurrent; i++ {
clientSem <- true
serverSem <- true
}
}
func BenchmarkTCP4ConcurrentReadWrite(b *testing.B) {
benchmarkTCPConcurrentReadWrite(b, "127.0.0.1:0")
}
func BenchmarkTCP6ConcurrentReadWrite(b *testing.B) {
if !supportsIPv6() {
b.Skip("ipv6 is not supported")
}
benchmarkTCPConcurrentReadWrite(b, "[::1]:0")
}
func benchmarkTCPConcurrentReadWrite(b *testing.B, laddr string) {
testHookUninstaller.Do(uninstallTestHooks)
// The benchmark creates GOMAXPROCS client/server pairs.
// Each pair creates 4 goroutines: client reader/writer and server reader/writer.
// The benchmark stresses concurrent reading and writing to the same connection.
// Such pattern is used in net/http and net/rpc.
b.StopTimer()
P := runtime.GOMAXPROCS(0)
N := b.N / P
W := 1000
// Setup P client/server connections.
clients := make([]Conn, P)
servers := make([]Conn, P)
ln, err := Listen("tcp", laddr)
if err != nil {
b.Fatal(err)
}
defer ln.Close()
done := make(chan bool)
go func() {
for p := 0; p < P; p++ {
s, err := ln.Accept()
if err != nil {
b.Error(err)
return
}
servers[p] = s
}
done <- true
}()
for p := 0; p < P; p++ {
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
b.Fatal(err)
}
clients[p] = c
}
<-done
b.StartTimer()
var wg sync.WaitGroup
wg.Add(4 * P)
for p := 0; p < P; p++ {
// Client writer.
go func(c Conn) {
defer wg.Done()
var buf [1]byte
for i := 0; i < N; i++ {
v := byte(i)
for w := 0; w < W; w++ {
v *= v
}
buf[0] = v
_, err := c.Write(buf[:])
if err != nil {
b.Error(err)
return
}
}
}(clients[p])
// Pipe between server reader and server writer.
pipe := make(chan byte, 128)
// Server reader.
go func(s Conn) {
defer wg.Done()
var buf [1]byte
for i := 0; i < N; i++ {
_, err := s.Read(buf[:])
if err != nil {
b.Error(err)
return
}
pipe <- buf[0]
}
}(servers[p])
// Server writer.
go func(s Conn) {
defer wg.Done()
var buf [1]byte
for i := 0; i < N; i++ {
v := <-pipe
for w := 0; w < W; w++ {
v *= v
}
buf[0] = v
_, err := s.Write(buf[:])
if err != nil {
b.Error(err)
return
}
}
s.Close()
}(servers[p])
// Client reader.
go func(c Conn) {
defer wg.Done()
var buf [1]byte
for i := 0; i < N; i++ {
_, err := c.Read(buf[:])
if err != nil {
b.Error(err)
return
}
}
c.Close()
}(clients[p])
}
wg.Wait()
}
type resolveTCPAddrTest struct {
network string
litAddrOrName string
addr *TCPAddr
err error
}
var resolveTCPAddrTests = []resolveTCPAddrTest{
{"tcp", "127.0.0.1:0", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil},
{"tcp4", "127.0.0.1:65535", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 65535}, nil},
{"tcp", "[::1]:0", &TCPAddr{IP: ParseIP("::1"), Port: 0}, nil},
{"tcp6", "[::1]:65535", &TCPAddr{IP: ParseIP("::1"), Port: 65535}, nil},
{"tcp", "[::1%en0]:1", &TCPAddr{IP: ParseIP("::1"), Port: 1, Zone: "en0"}, nil},
{"tcp6", "[::1%911]:2", &TCPAddr{IP: ParseIP("::1"), Port: 2, Zone: "911"}, nil},
{"", "127.0.0.1:0", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil}, // Go 1.0 behavior
{"", "[::1]:0", &TCPAddr{IP: ParseIP("::1"), Port: 0}, nil}, // Go 1.0 behavior
{"tcp", ":12345", &TCPAddr{Port: 12345}, nil},
{"http", "127.0.0.1:0", nil, UnknownNetworkError("http")},
{"tcp", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
{"tcp", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("::ffff:127.0.0.1"), Port: 80}, nil},
{"tcp", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},
{"tcp4", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
{"tcp4", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
{"tcp6", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},
{"tcp4", "[2001:db8::1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "2001:db8::1"}},
{"tcp6", "127.0.0.1:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "127.0.0.1"}},
{"tcp6", "[::ffff:127.0.0.1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "::ffff:127.0.0.1"}},
}
func TestResolveTCPAddr(t *testing.T) {
origTestHookLookupIP := testHookLookupIP
defer func() { testHookLookupIP = origTestHookLookupIP }()
testHookLookupIP = lookupLocalhost
for _, tt := range resolveTCPAddrTests {
addr, err := ResolveTCPAddr(tt.network, tt.litAddrOrName)
if !reflect.DeepEqual(addr, tt.addr) || !reflect.DeepEqual(err, tt.err) {
t.Errorf("ResolveTCPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr, err, tt.addr, tt.err)
continue
}
if err == nil {
addr2, err := ResolveTCPAddr(addr.Network(), addr.String())
if !reflect.DeepEqual(addr2, tt.addr) || err != tt.err {
t.Errorf("(%q, %q): ResolveTCPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr.Network(), addr.String(), addr2, err, tt.addr, tt.err)
}
}
}
}
var tcpListenerNameTests = []struct {
net string
laddr *TCPAddr
}{
{"tcp4", &TCPAddr{IP: IPv4(127, 0, 0, 1)}},
{"tcp4", &TCPAddr{}},
{"tcp4", nil},
}
func TestTCPListenerName(t *testing.T) {
testenv.MustHaveExternalNetwork(t)
for _, tt := range tcpListenerNameTests {
ln, err := ListenTCP(tt.net, tt.laddr)
if err != nil {
t.Fatal(err)
}
defer ln.Close()
la := ln.Addr()
if a, ok := la.(*TCPAddr); !ok || a.Port == 0 {
t.Fatalf("got %v; expected a proper address with non-zero port number", la)
}
}
}
func TestIPv6LinkLocalUnicastTCP(t *testing.T) {
testenv.MustHaveExternalNetwork(t)
if !supportsIPv6() {
t.Skip("IPv6 is not supported")
}
for i, tt := range ipv6LinkLocalUnicastTCPTests {
ln, err := Listen(tt.network, tt.address)
if err != nil {
// It might return "LookupHost returned no
// suitable address" error on some platforms.
t.Log(err)
continue
}
ls, err := (&streamListener{Listener: ln}).newLocalServer()
if err != nil {
t.Fatal(err)
}
defer ls.teardown()
ch := make(chan error, 1)
handler := func(ls *localServer, ln Listener) { transponder(ln, ch) }
if err := ls.buildup(handler); err != nil {
t.Fatal(err)
}
if la, ok := ln.Addr().(*TCPAddr); !ok || !tt.nameLookup && la.Zone == "" {
t.Fatalf("got %v; expected a proper address with zone identifier", la)
}
c, err := Dial(tt.network, ls.Listener.Addr().String())
if err != nil {
t.Fatal(err)
}
defer c.Close()
if la, ok := c.LocalAddr().(*TCPAddr); !ok || !tt.nameLookup && la.Zone == "" {
t.Fatalf("got %v; expected a proper address with zone identifier", la)
}
if ra, ok := c.RemoteAddr().(*TCPAddr); !ok || !tt.nameLookup && ra.Zone == "" {
t.Fatalf("got %v; expected a proper address with zone identifier", ra)
}
if _, err := c.Write([]byte("TCP OVER IPV6 LINKLOCAL TEST")); err != nil {
t.Fatal(err)
}
b := make([]byte, 32)
if _, err := c.Read(b); err != nil {
t.Fatal(err)
}
for err := range ch {
t.Errorf("#%d: %v", i, err)
}
}
}
func TestTCPConcurrentAccept(t *testing.T) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
const N = 10
var wg sync.WaitGroup
wg.Add(N)
for i := 0; i < N; i++ {
go func() {
for {
c, err := ln.Accept()
if err != nil {
break
}
c.Close()
}
wg.Done()
}()
}
attempts := 10 * N
fails := 0
d := &Dialer{Timeout: 200 * time.Millisecond}
for i := 0; i < attempts; i++ {
c, err := d.Dial("tcp", ln.Addr().String())
if err != nil {
fails++
} else {
c.Close()
}
}
ln.Close()
wg.Wait()
if fails > attempts/9 { // see issues 7400 and 7541
t.Fatalf("too many Dial failed: %v", fails)
}
if fails > 0 {
t.Logf("# of failed Dials: %v", fails)
}
}
func TestTCPReadWriteAllocs(t *testing.T) {
switch runtime.GOOS {
case "plan9":
// The implementation of asynchronous cancelable
// I/O on Plan 9 allocates memory.
// See net/fd_io_plan9.go.
t.Skipf("not supported on %s", runtime.GOOS)
case "nacl":
// NaCl needs to allocate pseudo file descriptor
// stuff. See syscall/fd_nacl.go.
t.Skipf("not supported on %s", runtime.GOOS)
}
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
defer ln.Close()
var server Conn
errc := make(chan error, 1)
go func() {
var err error
server, err = ln.Accept()
errc <- err
}()
client, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatal(err)
}
defer client.Close()
if err := <-errc; err != nil {
t.Fatal(err)
}
defer server.Close()
var buf [128]byte
allocs := testing.AllocsPerRun(1000, func() {
_, err := server.Write(buf[:])
if err != nil {
t.Fatal(err)
}
_, err = io.ReadFull(client, buf[:])
if err != nil {
t.Fatal(err)
}
})
if allocs > 0 {
t.Fatalf("got %v; want 0", allocs)
}
var bufwrt [128]byte
ch := make(chan bool)
defer close(ch)
go func() {
for <-ch {
_, err := server.Write(bufwrt[:])
errc <- err
}
}()
allocs = testing.AllocsPerRun(1000, func() {
ch <- true
if _, err = io.ReadFull(client, buf[:]); err != nil {
t.Fatal(err)
}
if err := <-errc; err != nil {
t.Fatal(err)
}
})
if allocs > 0 {
t.Fatalf("got %v; want 0", allocs)
}
}
func TestTCPStress(t *testing.T) {
const conns = 2
const msgLen = 512
msgs := int(1e4)
if testing.Short() {
msgs = 1e2
}
sendMsg := func(c Conn, buf []byte) bool {
n, err := c.Write(buf)
if n != len(buf) || err != nil {
t.Log(err)
return false
}
return true
}
recvMsg := func(c Conn, buf []byte) bool {
for read := 0; read != len(buf); {
n, err := c.Read(buf)
read += n
if err != nil {
t.Log(err)
return false
}
}
return true
}
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
done := make(chan bool)
// Acceptor.
go func() {
defer func() {
done <- true
}()
for {
c, err := ln.Accept()
if err != nil {
break
}
// Server connection.
go func(c Conn) {
defer c.Close()
var buf [msgLen]byte
for m := 0; m < msgs; m++ {
if !recvMsg(c, buf[:]) || !sendMsg(c, buf[:]) {
break
}
}
}(c)
}
}()
for i := 0; i < conns; i++ {
// Client connection.
go func() {
defer func() {
done <- true
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Log(err)
return
}
defer c.Close()
var buf [msgLen]byte
for m := 0; m < msgs; m++ {
if !sendMsg(c, buf[:]) || !recvMsg(c, buf[:]) {
break
}
}
}()
}
for i := 0; i < conns; i++ {
<-done
}
ln.Close()
<-done
}
func TestTCPSelfConnect(t *testing.T) {
if runtime.GOOS == "windows" {
// TODO(brainman): do not know why it hangs.
t.Skip("known-broken test on windows")
}
ln, err := newLocalListener("tcp")
if err != nil {
t.Fatal(err)
}
var d Dialer
c, err := d.Dial(ln.Addr().Network(), ln.Addr().String())
if err != nil {
ln.Close()
t.Fatal(err)
}
network := c.LocalAddr().Network()
laddr := *c.LocalAddr().(*TCPAddr)
c.Close()
ln.Close()
// Try to connect to that address repeatedly.
n := 100000
if testing.Short() {
n = 1000
}
switch runtime.GOOS {
case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9", "solaris", "windows":
// Non-Linux systems take a long time to figure
// out that there is nothing listening on localhost.
n = 100
}
for i := 0; i < n; i++ {
d.Timeout = time.Millisecond
c, err := d.Dial(network, laddr.String())
if err == nil {
addr := c.LocalAddr().(*TCPAddr)
if addr.Port == laddr.Port || addr.IP.Equal(laddr.IP) {
t.Errorf("Dial %v should fail", addr)
} else {
t.Logf("Dial %v succeeded - possibly racing with other listener", addr)
}
c.Close()
}
}
}
// Test that >32-bit reads work on 64-bit systems.
// On 32-bit systems this tests that maxint reads work.
func TestTCPBig(t *testing.T) {
if !*testTCPBig {
t.Skip("test disabled; use -tcpbig to enable")
}
for _, writev := range []bool{false, true} {
t.Run(fmt.Sprintf("writev=%v", writev), func(t *testing.T) {
ln, err := newLocalListener("tcp")
if err != nil {
t.Fatal(err)
}
defer ln.Close()
x := int(1 << 30)
x = x*5 + 1<<20 // just over 5 GB on 64-bit, just over 1GB on 32-bit
done := make(chan int)
go func() {
defer close(done)
c, err := ln.Accept()
if err != nil {
t.Error(err)
return
}
buf := make([]byte, x)
var n int
if writev {
var n64 int64
n64, err = (&Buffers{buf}).WriteTo(c)
n = int(n64)
} else {
n, err = c.Write(buf)
}
if n != len(buf) || err != nil {
t.Errorf("Write(buf) = %d, %v, want %d, nil", n, err, x)
}
c.Close()
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatal(err)
}
buf := make([]byte, x)
n, err := io.ReadFull(c, buf)
if n != len(buf) || err != nil {
t.Errorf("Read(buf) = %d, %v, want %d, nil", n, err, x)
}
c.Close()
<-done
})
}
}
func TestCopyPipeIntoTCP(t *testing.T) {
ln, err := newLocalListener("tcp")
if err != nil {
t.Fatal(err)
}
defer ln.Close()
errc := make(chan error, 1)
defer func() {
if err := <-errc; err != nil {
t.Error(err)
}
}()
go func() {
c, err := ln.Accept()
if err != nil {
errc <- err
return
}
defer c.Close()
buf := make([]byte, 100)
n, err := io.ReadFull(c, buf)
if err != io.ErrUnexpectedEOF || n != 2 {
errc <- fmt.Errorf("got err=%q n=%v; want err=%q n=2", err, n, io.ErrUnexpectedEOF)
return
}
errc <- nil
}()
c, err := Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatal(err)
}
defer c.Close()
r, w, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
defer r.Close()
errc2 := make(chan error, 1)
defer func() {
if err := <-errc2; err != nil {
t.Error(err)
}
}()
defer w.Close()
go func() {
_, err := io.Copy(c, r)
errc2 <- err
}()
// Split write into 2 packets. That makes Windows TransmitFile
// drop second packet.
packet := make([]byte, 1)
_, err = w.Write(packet)
if err != nil {
t.Fatal(err)
}
time.Sleep(100 * time.Millisecond)
_, err = w.Write(packet)
if err != nil {
t.Fatal(err)
}
}