1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
package reuseport
import (
"fmt"
"io/ioutil"
"net"
"testing"
"time"
)
func TestNewListener(t *testing.T) {
addr := "localhost:10081"
serversCount := 20
requestsCount := 1000
var lns []net.Listener
doneCh := make(chan struct{}, serversCount)
for i := 0; i < serversCount; i++ {
ln, err := Listen("tcp4", addr)
if err != nil {
t.Fatalf("cannot create listener %d: %s", i, err)
}
go func() {
serveEcho(t, ln)
doneCh <- struct{}{}
}()
lns = append(lns, ln)
}
for i := 0; i < requestsCount; i++ {
c, err := net.Dial("tcp4", addr)
if err != nil {
t.Fatalf("%d. unexpected error when dialing: %s", i, err)
}
req := fmt.Sprintf("request number %d", i)
if _, err = c.Write([]byte(req)); err != nil {
t.Fatalf("%d. unexpected error when writing request: %s", i, err)
}
if err = c.(*net.TCPConn).CloseWrite(); err != nil {
t.Fatalf("%d. unexpected error when closing write end of the connection: %s", i, err)
}
var resp []byte
ch := make(chan struct{})
go func() {
if resp, err = ioutil.ReadAll(c); err != nil {
t.Fatalf("%d. unexpected error when reading response: %s", i, err)
}
close(ch)
}()
select {
case <-ch:
case <-time.After(200 * time.Millisecond):
t.Fatalf("%d. timeout when waiting for response: %s", i, err)
}
if string(resp) != req {
t.Fatalf("%d. unexpected response %q. Expecting %q", i, resp, req)
}
if err = c.Close(); err != nil {
t.Fatalf("%d. unexpected error when closing connection: %s", i, err)
}
}
for _, ln := range lns {
if err := ln.Close(); err != nil {
t.Fatalf("unexpected error when closing listener: %s", err)
}
}
for i := 0; i < serversCount; i++ {
select {
case <-doneCh:
case <-time.After(200 * time.Millisecond):
t.Fatalf("timeout when waiting for servers to be closed")
}
}
}
func serveEcho(t *testing.T, ln net.Listener) {
for {
c, err := ln.Accept()
if err != nil {
break
}
req, err := ioutil.ReadAll(c)
if err != nil {
t.Fatalf("unepxected error when reading request: %s", err)
}
if _, err = c.Write(req); err != nil {
t.Fatalf("unexpected error when writing response: %s", err)
}
if err = c.Close(); err != nil {
t.Fatalf("unexpected error when closing connection: %s", err)
}
}
}
|
