154 lines
3 KiB
Go
154 lines
3 KiB
Go
package tcp
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import (
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"bytes"
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"fmt"
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"io"
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"net"
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"sync"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func fakeRedis(t *testing.T, listener net.Listener) {
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for {
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conn, err := listener.Accept()
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fmt.Println("Accept on server")
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require.NoError(t, err)
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for {
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withErr := false
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buf := make([]byte, 64)
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if _, err := conn.Read(buf); err != nil {
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withErr = true
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}
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if string(buf[:4]) == "ping" {
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time.Sleep(1 * time.Millisecond)
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if _, err := conn.Write([]byte("PONG")); err != nil {
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conn.Close()
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return
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}
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}
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if withErr {
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conn.Close()
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return
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}
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}
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}
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}
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func TestCloseWrite(t *testing.T) {
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backendListener, err := net.Listen("tcp", ":0")
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require.NoError(t, err)
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go fakeRedis(t, backendListener)
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_, port, err := net.SplitHostPort(backendListener.Addr().String())
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require.NoError(t, err)
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proxy, err := NewProxy(":"+port, 10*time.Millisecond)
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require.NoError(t, err)
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proxyListener, err := net.Listen("tcp", ":0")
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require.NoError(t, err)
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go func() {
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for {
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conn, err := proxyListener.Accept()
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require.NoError(t, err)
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proxy.ServeTCP(conn.(*net.TCPConn))
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}
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}()
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_, port, err = net.SplitHostPort(proxyListener.Addr().String())
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require.NoError(t, err)
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conn, err := net.Dial("tcp", ":"+port)
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require.NoError(t, err)
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_, err = conn.Write([]byte("ping\n"))
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require.NoError(t, err)
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err = conn.(*net.TCPConn).CloseWrite()
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require.NoError(t, err)
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var buf []byte
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buffer := bytes.NewBuffer(buf)
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n, err := io.Copy(buffer, conn)
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require.NoError(t, err)
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require.Equal(t, int64(4), n)
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require.Equal(t, "PONG", buffer.String())
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}
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func TestLookupAddress(t *testing.T) {
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testCases := []struct {
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desc string
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address string
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expectSame assert.ComparisonAssertionFunc
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}{
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{
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desc: "IP doesn't need refresh",
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address: "8.8.4.4:53",
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expectSame: assert.Same,
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},
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{
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desc: "Hostname needs refresh",
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address: "dns.google:53",
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expectSame: assert.NotSame,
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},
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}
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for _, test := range testCases {
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test := test
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t.Run(test.desc, func(t *testing.T) {
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t.Parallel()
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proxy, err := NewProxy(test.address, 10*time.Millisecond)
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require.NoError(t, err)
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require.NotNil(t, proxy.target)
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proxyListener, err := net.Listen("tcp", ":0")
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require.NoError(t, err)
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var wg sync.WaitGroup
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go func(wg *sync.WaitGroup) {
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for {
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conn, err := proxyListener.Accept()
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require.NoError(t, err)
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proxy.ServeTCP(conn.(*net.TCPConn))
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wg.Done()
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}
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}(&wg)
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var lastTarget *net.TCPAddr
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for i := 0; i < 3; i++ {
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wg.Add(1)
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conn, err := net.Dial("tcp", proxyListener.Addr().String())
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require.NoError(t, err)
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_, err = conn.Write([]byte("ping\n"))
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require.NoError(t, err)
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err = conn.Close()
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require.NoError(t, err)
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wg.Wait()
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assert.NotNil(t, proxy.target)
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if lastTarget != nil {
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test.expectSame(t, lastTarget, proxy.target)
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}
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lastTarget = proxy.target
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}
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})
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}
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}
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