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|
package reuseport
import (
"fmt"
"io/ioutil"
"net"
"testing"
"time"
)
func TestTCP4(t *testing.T) {
t.Parallel()
testNewListener(t, "tcp4", "localhost:10081", 20, 1000)
}
func TestTCP6(t *testing.T) {
t.Parallel()
// Run this test only if tcp6 interface exists.
if hasLocalIPv6(t) {
testNewListener(t, "tcp6", "[::1]:10082", 20, 1000)
}
}
func hasLocalIPv6(t *testing.T) bool {
addrs, err := net.InterfaceAddrs()
if err != nil {
t.Fatalf("cannot obtain local interfaces: %s", err)
}
for _, a := range addrs {
if a.String() == "::1/128" {
return true
}
}
return false
}
func testNewListener(t *testing.T, network, addr string, serversCount, requestsCount int) {
var lns []net.Listener
doneCh := make(chan struct{}, serversCount)
for i := 0; i < serversCount; i++ {
ln, err := Listen(network, 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(network, 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.Errorf("%d. unexpected error when reading response: %s", i, err)
}
close(ch)
}()
select {
case <-ch:
case <-time.After(250 * time.Millisecond):
t.Fatalf("%d. timeout when waiting for response", i)
}
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("unexpected 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)
}
}
}
|
