traefik/pkg/tcp/proxy_test.go

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package tcp
import (
"bytes"
"fmt"
"io"
"net"
"testing"
"time"
"github.com/stretchr/testify/require"
)
func fakeRedis(t *testing.T, listener net.Listener) {
for {
conn, err := listener.Accept()
fmt.Println("Accept on server")
require.NoError(t, err)
for {
withErr := false
buf := make([]byte, 64)
if _, err := conn.Read(buf); err != nil {
withErr = true
}
if string(buf[:4]) == "ping" {
time.Sleep(time.Millisecond * 1)
if _, err := conn.Write([]byte("PONG")); err != nil {
conn.Close()
return
}
}
if withErr {
conn.Close()
return
}
}
}
}
func TestCloseWrite(t *testing.T) {
backendListener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
go fakeRedis(t, backendListener)
_, port, err := net.SplitHostPort(backendListener.Addr().String())
require.NoError(t, err)
proxy, err := NewProxy(":"+port, 10*time.Millisecond)
require.NoError(t, err)
proxyListener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
go func() {
for {
conn, err := proxyListener.Accept()
require.NoError(t, err)
proxy.ServeTCP(conn.(*net.TCPConn))
}
}()
_, port, err = net.SplitHostPort(proxyListener.Addr().String())
require.NoError(t, err)
conn, err := net.Dial("tcp", ":"+port)
require.NoError(t, err)
_, err = conn.Write([]byte("ping\n"))
require.NoError(t, err)
err = conn.(*net.TCPConn).CloseWrite()
require.NoError(t, err)
var buf []byte
buffer := bytes.NewBuffer(buf)
n, err := io.Copy(buffer, conn)
require.NoError(t, err)
require.Equal(t, int64(4), n)
require.Equal(t, "PONG", buffer.String())
}