Source file
src/net/tcpsock_test.go
Documentation: net
1
2
3
4
5
6
7 package net
8
9 import (
10 "fmt"
11 "internal/testenv"
12 "io"
13 "os"
14 "reflect"
15 "runtime"
16 "sync"
17 "testing"
18 "time"
19 )
20
21 func BenchmarkTCP4OneShot(b *testing.B) {
22 benchmarkTCP(b, false, false, "127.0.0.1:0")
23 }
24
25 func BenchmarkTCP4OneShotTimeout(b *testing.B) {
26 benchmarkTCP(b, false, true, "127.0.0.1:0")
27 }
28
29 func BenchmarkTCP4Persistent(b *testing.B) {
30 benchmarkTCP(b, true, false, "127.0.0.1:0")
31 }
32
33 func BenchmarkTCP4PersistentTimeout(b *testing.B) {
34 benchmarkTCP(b, true, true, "127.0.0.1:0")
35 }
36
37 func BenchmarkTCP6OneShot(b *testing.B) {
38 if !supportsIPv6() {
39 b.Skip("ipv6 is not supported")
40 }
41 benchmarkTCP(b, false, false, "[::1]:0")
42 }
43
44 func BenchmarkTCP6OneShotTimeout(b *testing.B) {
45 if !supportsIPv6() {
46 b.Skip("ipv6 is not supported")
47 }
48 benchmarkTCP(b, false, true, "[::1]:0")
49 }
50
51 func BenchmarkTCP6Persistent(b *testing.B) {
52 if !supportsIPv6() {
53 b.Skip("ipv6 is not supported")
54 }
55 benchmarkTCP(b, true, false, "[::1]:0")
56 }
57
58 func BenchmarkTCP6PersistentTimeout(b *testing.B) {
59 if !supportsIPv6() {
60 b.Skip("ipv6 is not supported")
61 }
62 benchmarkTCP(b, true, true, "[::1]:0")
63 }
64
65 func benchmarkTCP(b *testing.B, persistent, timeout bool, laddr string) {
66 testHookUninstaller.Do(uninstallTestHooks)
67
68 const msgLen = 512
69 conns := b.N
70 numConcurrent := runtime.GOMAXPROCS(-1) * 2
71 msgs := 1
72 if persistent {
73 conns = numConcurrent
74 msgs = b.N / conns
75 if msgs == 0 {
76 msgs = 1
77 }
78 if conns > b.N {
79 conns = b.N
80 }
81 }
82 sendMsg := func(c Conn, buf []byte) bool {
83 n, err := c.Write(buf)
84 if n != len(buf) || err != nil {
85 b.Log(err)
86 return false
87 }
88 return true
89 }
90 recvMsg := func(c Conn, buf []byte) bool {
91 for read := 0; read != len(buf); {
92 n, err := c.Read(buf)
93 read += n
94 if err != nil {
95 b.Log(err)
96 return false
97 }
98 }
99 return true
100 }
101 ln, err := Listen("tcp", laddr)
102 if err != nil {
103 b.Fatal(err)
104 }
105 defer ln.Close()
106 serverSem := make(chan bool, numConcurrent)
107
108 go func() {
109 for {
110 c, err := ln.Accept()
111 if err != nil {
112 break
113 }
114 serverSem <- true
115
116 go func(c Conn) {
117 defer func() {
118 c.Close()
119 <-serverSem
120 }()
121 if timeout {
122 c.SetDeadline(time.Now().Add(time.Hour))
123 }
124 var buf [msgLen]byte
125 for m := 0; m < msgs; m++ {
126 if !recvMsg(c, buf[:]) || !sendMsg(c, buf[:]) {
127 break
128 }
129 }
130 }(c)
131 }
132 }()
133 clientSem := make(chan bool, numConcurrent)
134 for i := 0; i < conns; i++ {
135 clientSem <- true
136
137 go func() {
138 defer func() {
139 <-clientSem
140 }()
141 c, err := Dial("tcp", ln.Addr().String())
142 if err != nil {
143 b.Log(err)
144 return
145 }
146 defer c.Close()
147 if timeout {
148 c.SetDeadline(time.Now().Add(time.Hour))
149 }
150 var buf [msgLen]byte
151 for m := 0; m < msgs; m++ {
152 if !sendMsg(c, buf[:]) || !recvMsg(c, buf[:]) {
153 break
154 }
155 }
156 }()
157 }
158 for i := 0; i < numConcurrent; i++ {
159 clientSem <- true
160 serverSem <- true
161 }
162 }
163
164 func BenchmarkTCP4ConcurrentReadWrite(b *testing.B) {
165 benchmarkTCPConcurrentReadWrite(b, "127.0.0.1:0")
166 }
167
168 func BenchmarkTCP6ConcurrentReadWrite(b *testing.B) {
169 if !supportsIPv6() {
170 b.Skip("ipv6 is not supported")
171 }
172 benchmarkTCPConcurrentReadWrite(b, "[::1]:0")
173 }
174
175 func benchmarkTCPConcurrentReadWrite(b *testing.B, laddr string) {
176 testHookUninstaller.Do(uninstallTestHooks)
177
178
179
180
181
182
183 b.StopTimer()
184
185 P := runtime.GOMAXPROCS(0)
186 N := b.N / P
187 W := 1000
188
189
190 clients := make([]Conn, P)
191 servers := make([]Conn, P)
192 ln, err := Listen("tcp", laddr)
193 if err != nil {
194 b.Fatal(err)
195 }
196 defer ln.Close()
197 done := make(chan bool)
198 go func() {
199 for p := 0; p < P; p++ {
200 s, err := ln.Accept()
201 if err != nil {
202 b.Error(err)
203 return
204 }
205 servers[p] = s
206 }
207 done <- true
208 }()
209 for p := 0; p < P; p++ {
210 c, err := Dial("tcp", ln.Addr().String())
211 if err != nil {
212 b.Fatal(err)
213 }
214 clients[p] = c
215 }
216 <-done
217
218 b.StartTimer()
219
220 var wg sync.WaitGroup
221 wg.Add(4 * P)
222 for p := 0; p < P; p++ {
223
224 go func(c Conn) {
225 defer wg.Done()
226 var buf [1]byte
227 for i := 0; i < N; i++ {
228 v := byte(i)
229 for w := 0; w < W; w++ {
230 v *= v
231 }
232 buf[0] = v
233 _, err := c.Write(buf[:])
234 if err != nil {
235 b.Error(err)
236 return
237 }
238 }
239 }(clients[p])
240
241
242 pipe := make(chan byte, 128)
243
244
245 go func(s Conn) {
246 defer wg.Done()
247 var buf [1]byte
248 for i := 0; i < N; i++ {
249 _, err := s.Read(buf[:])
250 if err != nil {
251 b.Error(err)
252 return
253 }
254 pipe <- buf[0]
255 }
256 }(servers[p])
257
258
259 go func(s Conn) {
260 defer wg.Done()
261 var buf [1]byte
262 for i := 0; i < N; i++ {
263 v := <-pipe
264 for w := 0; w < W; w++ {
265 v *= v
266 }
267 buf[0] = v
268 _, err := s.Write(buf[:])
269 if err != nil {
270 b.Error(err)
271 return
272 }
273 }
274 s.Close()
275 }(servers[p])
276
277
278 go func(c Conn) {
279 defer wg.Done()
280 var buf [1]byte
281 for i := 0; i < N; i++ {
282 _, err := c.Read(buf[:])
283 if err != nil {
284 b.Error(err)
285 return
286 }
287 }
288 c.Close()
289 }(clients[p])
290 }
291 wg.Wait()
292 }
293
294 type resolveTCPAddrTest struct {
295 network string
296 litAddrOrName string
297 addr *TCPAddr
298 err error
299 }
300
301 var resolveTCPAddrTests = []resolveTCPAddrTest{
302 {"tcp", "127.0.0.1:0", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil},
303 {"tcp4", "127.0.0.1:65535", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 65535}, nil},
304
305 {"tcp", "[::1]:0", &TCPAddr{IP: ParseIP("::1"), Port: 0}, nil},
306 {"tcp6", "[::1]:65535", &TCPAddr{IP: ParseIP("::1"), Port: 65535}, nil},
307
308 {"tcp", "[::1%en0]:1", &TCPAddr{IP: ParseIP("::1"), Port: 1, Zone: "en0"}, nil},
309 {"tcp6", "[::1%911]:2", &TCPAddr{IP: ParseIP("::1"), Port: 2, Zone: "911"}, nil},
310
311 {"", "127.0.0.1:0", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil},
312 {"", "[::1]:0", &TCPAddr{IP: ParseIP("::1"), Port: 0}, nil},
313
314 {"tcp", ":12345", &TCPAddr{Port: 12345}, nil},
315
316 {"http", "127.0.0.1:0", nil, UnknownNetworkError("http")},
317
318 {"tcp", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
319 {"tcp", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("::ffff:127.0.0.1"), Port: 80}, nil},
320 {"tcp", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},
321 {"tcp4", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
322 {"tcp4", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
323 {"tcp6", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},
324
325 {"tcp4", "[2001:db8::1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "2001:db8::1"}},
326 {"tcp6", "127.0.0.1:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "127.0.0.1"}},
327 {"tcp6", "[::ffff:127.0.0.1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "::ffff:127.0.0.1"}},
328 }
329
330 func TestResolveTCPAddr(t *testing.T) {
331 origTestHookLookupIP := testHookLookupIP
332 defer func() { testHookLookupIP = origTestHookLookupIP }()
333 testHookLookupIP = lookupLocalhost
334
335 for _, tt := range resolveTCPAddrTests {
336 addr, err := ResolveTCPAddr(tt.network, tt.litAddrOrName)
337 if !reflect.DeepEqual(addr, tt.addr) || !reflect.DeepEqual(err, tt.err) {
338 t.Errorf("ResolveTCPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr, err, tt.addr, tt.err)
339 continue
340 }
341 if err == nil {
342 addr2, err := ResolveTCPAddr(addr.Network(), addr.String())
343 if !reflect.DeepEqual(addr2, tt.addr) || err != tt.err {
344 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)
345 }
346 }
347 }
348 }
349
350 var tcpListenerNameTests = []struct {
351 net string
352 laddr *TCPAddr
353 }{
354 {"tcp4", &TCPAddr{IP: IPv4(127, 0, 0, 1)}},
355 {"tcp4", &TCPAddr{}},
356 {"tcp4", nil},
357 }
358
359 func TestTCPListenerName(t *testing.T) {
360 testenv.MustHaveExternalNetwork(t)
361
362 for _, tt := range tcpListenerNameTests {
363 ln, err := ListenTCP(tt.net, tt.laddr)
364 if err != nil {
365 t.Fatal(err)
366 }
367 defer ln.Close()
368 la := ln.Addr()
369 if a, ok := la.(*TCPAddr); !ok || a.Port == 0 {
370 t.Fatalf("got %v; expected a proper address with non-zero port number", la)
371 }
372 }
373 }
374
375 func TestIPv6LinkLocalUnicastTCP(t *testing.T) {
376 testenv.MustHaveExternalNetwork(t)
377
378 if !supportsIPv6() {
379 t.Skip("IPv6 is not supported")
380 }
381
382 for i, tt := range ipv6LinkLocalUnicastTCPTests {
383 ln, err := Listen(tt.network, tt.address)
384 if err != nil {
385
386
387 t.Log(err)
388 continue
389 }
390 ls, err := (&streamListener{Listener: ln}).newLocalServer()
391 if err != nil {
392 t.Fatal(err)
393 }
394 defer ls.teardown()
395 ch := make(chan error, 1)
396 handler := func(ls *localServer, ln Listener) { transponder(ln, ch) }
397 if err := ls.buildup(handler); err != nil {
398 t.Fatal(err)
399 }
400 if la, ok := ln.Addr().(*TCPAddr); !ok || !tt.nameLookup && la.Zone == "" {
401 t.Fatalf("got %v; expected a proper address with zone identifier", la)
402 }
403
404 c, err := Dial(tt.network, ls.Listener.Addr().String())
405 if err != nil {
406 t.Fatal(err)
407 }
408 defer c.Close()
409 if la, ok := c.LocalAddr().(*TCPAddr); !ok || !tt.nameLookup && la.Zone == "" {
410 t.Fatalf("got %v; expected a proper address with zone identifier", la)
411 }
412 if ra, ok := c.RemoteAddr().(*TCPAddr); !ok || !tt.nameLookup && ra.Zone == "" {
413 t.Fatalf("got %v; expected a proper address with zone identifier", ra)
414 }
415
416 if _, err := c.Write([]byte("TCP OVER IPV6 LINKLOCAL TEST")); err != nil {
417 t.Fatal(err)
418 }
419 b := make([]byte, 32)
420 if _, err := c.Read(b); err != nil {
421 t.Fatal(err)
422 }
423
424 for err := range ch {
425 t.Errorf("#%d: %v", i, err)
426 }
427 }
428 }
429
430 func TestTCPConcurrentAccept(t *testing.T) {
431 defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
432 ln, err := Listen("tcp", "127.0.0.1:0")
433 if err != nil {
434 t.Fatal(err)
435 }
436 const N = 10
437 var wg sync.WaitGroup
438 wg.Add(N)
439 for i := 0; i < N; i++ {
440 go func() {
441 for {
442 c, err := ln.Accept()
443 if err != nil {
444 break
445 }
446 c.Close()
447 }
448 wg.Done()
449 }()
450 }
451 attempts := 10 * N
452 fails := 0
453 d := &Dialer{Timeout: 200 * time.Millisecond}
454 for i := 0; i < attempts; i++ {
455 c, err := d.Dial("tcp", ln.Addr().String())
456 if err != nil {
457 fails++
458 } else {
459 c.Close()
460 }
461 }
462 ln.Close()
463 wg.Wait()
464 if fails > attempts/9 {
465 t.Fatalf("too many Dial failed: %v", fails)
466 }
467 if fails > 0 {
468 t.Logf("# of failed Dials: %v", fails)
469 }
470 }
471
472 func TestTCPReadWriteAllocs(t *testing.T) {
473 switch runtime.GOOS {
474 case "plan9":
475
476
477
478 t.Skipf("not supported on %s", runtime.GOOS)
479 }
480
481 ln, err := Listen("tcp", "127.0.0.1:0")
482 if err != nil {
483 t.Fatal(err)
484 }
485 defer ln.Close()
486 var server Conn
487 errc := make(chan error, 1)
488 go func() {
489 var err error
490 server, err = ln.Accept()
491 errc <- err
492 }()
493 client, err := Dial("tcp", ln.Addr().String())
494 if err != nil {
495 t.Fatal(err)
496 }
497 defer client.Close()
498 if err := <-errc; err != nil {
499 t.Fatal(err)
500 }
501 defer server.Close()
502
503 var buf [128]byte
504 allocs := testing.AllocsPerRun(1000, func() {
505 _, err := server.Write(buf[:])
506 if err != nil {
507 t.Fatal(err)
508 }
509 _, err = io.ReadFull(client, buf[:])
510 if err != nil {
511 t.Fatal(err)
512 }
513 })
514 if allocs > 0 {
515 t.Fatalf("got %v; want 0", allocs)
516 }
517
518 var bufwrt [128]byte
519 ch := make(chan bool)
520 defer close(ch)
521 go func() {
522 for <-ch {
523 _, err := server.Write(bufwrt[:])
524 errc <- err
525 }
526 }()
527 allocs = testing.AllocsPerRun(1000, func() {
528 ch <- true
529 if _, err = io.ReadFull(client, buf[:]); err != nil {
530 t.Fatal(err)
531 }
532 if err := <-errc; err != nil {
533 t.Fatal(err)
534 }
535 })
536 if allocs > 0 {
537 t.Fatalf("got %v; want 0", allocs)
538 }
539 }
540
541 func TestTCPStress(t *testing.T) {
542 const conns = 2
543 const msgLen = 512
544 msgs := int(1e4)
545 if testing.Short() {
546 msgs = 1e2
547 }
548
549 sendMsg := func(c Conn, buf []byte) bool {
550 n, err := c.Write(buf)
551 if n != len(buf) || err != nil {
552 t.Log(err)
553 return false
554 }
555 return true
556 }
557 recvMsg := func(c Conn, buf []byte) bool {
558 for read := 0; read != len(buf); {
559 n, err := c.Read(buf)
560 read += n
561 if err != nil {
562 t.Log(err)
563 return false
564 }
565 }
566 return true
567 }
568
569 ln, err := Listen("tcp", "127.0.0.1:0")
570 if err != nil {
571 t.Fatal(err)
572 }
573 done := make(chan bool)
574
575 go func() {
576 defer func() {
577 done <- true
578 }()
579 for {
580 c, err := ln.Accept()
581 if err != nil {
582 break
583 }
584
585 go func(c Conn) {
586 defer c.Close()
587 var buf [msgLen]byte
588 for m := 0; m < msgs; m++ {
589 if !recvMsg(c, buf[:]) || !sendMsg(c, buf[:]) {
590 break
591 }
592 }
593 }(c)
594 }
595 }()
596 for i := 0; i < conns; i++ {
597
598 go func() {
599 defer func() {
600 done <- true
601 }()
602 c, err := Dial("tcp", ln.Addr().String())
603 if err != nil {
604 t.Log(err)
605 return
606 }
607 defer c.Close()
608 var buf [msgLen]byte
609 for m := 0; m < msgs; m++ {
610 if !sendMsg(c, buf[:]) || !recvMsg(c, buf[:]) {
611 break
612 }
613 }
614 }()
615 }
616 for i := 0; i < conns; i++ {
617 <-done
618 }
619 ln.Close()
620 <-done
621 }
622
623 func TestTCPSelfConnect(t *testing.T) {
624 if runtime.GOOS == "windows" {
625
626 t.Skip("known-broken test on windows")
627 }
628
629 ln, err := newLocalListener("tcp")
630 if err != nil {
631 t.Fatal(err)
632 }
633 var d Dialer
634 c, err := d.Dial(ln.Addr().Network(), ln.Addr().String())
635 if err != nil {
636 ln.Close()
637 t.Fatal(err)
638 }
639 network := c.LocalAddr().Network()
640 laddr := *c.LocalAddr().(*TCPAddr)
641 c.Close()
642 ln.Close()
643
644
645 n := 100000
646 if testing.Short() {
647 n = 1000
648 }
649 switch runtime.GOOS {
650 case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9", "illumos", "solaris", "windows":
651
652
653 n = 100
654 }
655 for i := 0; i < n; i++ {
656 d.Timeout = time.Millisecond
657 c, err := d.Dial(network, laddr.String())
658 if err == nil {
659 addr := c.LocalAddr().(*TCPAddr)
660 if addr.Port == laddr.Port || addr.IP.Equal(laddr.IP) {
661 t.Errorf("Dial %v should fail", addr)
662 } else {
663 t.Logf("Dial %v succeeded - possibly racing with other listener", addr)
664 }
665 c.Close()
666 }
667 }
668 }
669
670
671
672 func TestTCPBig(t *testing.T) {
673 if !*testTCPBig {
674 t.Skip("test disabled; use -tcpbig to enable")
675 }
676
677 for _, writev := range []bool{false, true} {
678 t.Run(fmt.Sprintf("writev=%v", writev), func(t *testing.T) {
679 ln, err := newLocalListener("tcp")
680 if err != nil {
681 t.Fatal(err)
682 }
683 defer ln.Close()
684
685 x := int(1 << 30)
686 x = x*5 + 1<<20
687 done := make(chan int)
688 go func() {
689 defer close(done)
690 c, err := ln.Accept()
691 if err != nil {
692 t.Error(err)
693 return
694 }
695 buf := make([]byte, x)
696 var n int
697 if writev {
698 var n64 int64
699 n64, err = (&Buffers{buf}).WriteTo(c)
700 n = int(n64)
701 } else {
702 n, err = c.Write(buf)
703 }
704 if n != len(buf) || err != nil {
705 t.Errorf("Write(buf) = %d, %v, want %d, nil", n, err, x)
706 }
707 c.Close()
708 }()
709
710 c, err := Dial("tcp", ln.Addr().String())
711 if err != nil {
712 t.Fatal(err)
713 }
714 buf := make([]byte, x)
715 n, err := io.ReadFull(c, buf)
716 if n != len(buf) || err != nil {
717 t.Errorf("Read(buf) = %d, %v, want %d, nil", n, err, x)
718 }
719 c.Close()
720 <-done
721 })
722 }
723 }
724
725 func TestCopyPipeIntoTCP(t *testing.T) {
726 ln, err := newLocalListener("tcp")
727 if err != nil {
728 t.Fatal(err)
729 }
730 defer ln.Close()
731
732 errc := make(chan error, 1)
733 defer func() {
734 if err := <-errc; err != nil {
735 t.Error(err)
736 }
737 }()
738 go func() {
739 c, err := ln.Accept()
740 if err != nil {
741 errc <- err
742 return
743 }
744 defer c.Close()
745
746 buf := make([]byte, 100)
747 n, err := io.ReadFull(c, buf)
748 if err != io.ErrUnexpectedEOF || n != 2 {
749 errc <- fmt.Errorf("got err=%q n=%v; want err=%q n=2", err, n, io.ErrUnexpectedEOF)
750 return
751 }
752
753 errc <- nil
754 }()
755
756 c, err := Dial("tcp", ln.Addr().String())
757 if err != nil {
758 t.Fatal(err)
759 }
760 defer c.Close()
761
762 r, w, err := os.Pipe()
763 if err != nil {
764 t.Fatal(err)
765 }
766 defer r.Close()
767
768 errc2 := make(chan error, 1)
769 defer func() {
770 if err := <-errc2; err != nil {
771 t.Error(err)
772 }
773 }()
774
775 defer w.Close()
776
777 go func() {
778 _, err := io.Copy(c, r)
779 errc2 <- err
780 }()
781
782
783
784 packet := make([]byte, 1)
785 _, err = w.Write(packet)
786 if err != nil {
787 t.Fatal(err)
788 }
789 time.Sleep(100 * time.Millisecond)
790 _, err = w.Write(packet)
791 if err != nil {
792 t.Fatal(err)
793 }
794 }
795
796 func BenchmarkSetReadDeadline(b *testing.B) {
797 ln, err := newLocalListener("tcp")
798 if err != nil {
799 b.Fatal(err)
800 }
801 defer ln.Close()
802 var serv Conn
803 done := make(chan error)
804 go func() {
805 var err error
806 serv, err = ln.Accept()
807 done <- err
808 }()
809 c, err := Dial("tcp", ln.Addr().String())
810 if err != nil {
811 b.Fatal(err)
812 }
813 defer c.Close()
814 if err := <-done; err != nil {
815 b.Fatal(err)
816 }
817 defer serv.Close()
818 c.SetWriteDeadline(time.Now().Add(2 * time.Hour))
819 deadline := time.Now().Add(time.Hour)
820 b.ResetTimer()
821 for i := 0; i < b.N; i++ {
822 c.SetReadDeadline(deadline)
823 deadline = deadline.Add(1)
824 }
825 }
826
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