traefik/pkg/middlewares/pipelining/pipelining_test.go

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package pipelining
import (
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"context"
"io"
"net/http"
"net/http/httptest"
"net/http/httptrace"
"net/textproto"
"testing"
"github.com/stretchr/testify/assert"
)
type recorderWithCloseNotify struct {
*httptest.ResponseRecorder
}
func (r *recorderWithCloseNotify) CloseNotify() <-chan bool {
panic("implement me")
}
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func TestNew(t *testing.T) {
testCases := []struct {
desc string
HTTPMethod string
implementCloseNotifier bool
}{
{
desc: "should not implement CloseNotifier with GET method",
HTTPMethod: http.MethodGet,
implementCloseNotifier: false,
},
{
desc: "should implement CloseNotifier with PUT method",
HTTPMethod: http.MethodPut,
implementCloseNotifier: true,
},
{
desc: "should implement CloseNotifier with POST method",
HTTPMethod: http.MethodPost,
implementCloseNotifier: true,
},
{
desc: "should not implement CloseNotifier with GET method",
HTTPMethod: http.MethodHead,
implementCloseNotifier: false,
},
{
desc: "should not implement CloseNotifier with PROPFIND method",
HTTPMethod: "PROPFIND",
implementCloseNotifier: false,
},
}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
nextHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, ok := w.(http.CloseNotifier)
assert.Equal(t, test.implementCloseNotifier, ok)
w.WriteHeader(http.StatusOK)
})
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handler := New(context.Background(), nextHandler, "pipe")
req := httptest.NewRequest(test.HTTPMethod, "http://localhost", nil)
handler.ServeHTTP(&recorderWithCloseNotify{httptest.NewRecorder()}, req)
})
}
}
// This test is an adapted version of net/http/httputil.Test1xxResponses test.
// This test is only here to guarantee that there would not be any regression in the future,
// because the pipelining middleware is already supporting informational headers.
func Test1xxResponses(t *testing.T) {
next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
h := w.Header()
h.Add("Link", "</style.css>; rel=preload; as=style")
h.Add("Link", "</script.js>; rel=preload; as=script")
w.WriteHeader(http.StatusEarlyHints)
h.Add("Link", "</foo.js>; rel=preload; as=script")
w.WriteHeader(http.StatusProcessing)
_, _ = w.Write([]byte("Hello"))
})
pipe := New(context.Background(), next, "pipe")
server := httptest.NewServer(pipe)
t.Cleanup(server.Close)
frontendClient := server.Client()
checkLinkHeaders := func(t *testing.T, expected, got []string) {
t.Helper()
if len(expected) != len(got) {
t.Errorf("Expected %d link headers; got %d", len(expected), len(got))
}
for i := range expected {
if i >= len(got) {
t.Errorf("Expected %q link header; got nothing", expected[i])
continue
}
if expected[i] != got[i] {
t.Errorf("Expected %q link header; got %q", expected[i], got[i])
}
}
}
var respCounter uint8
trace := &httptrace.ClientTrace{
Got1xxResponse: func(code int, header textproto.MIMEHeader) error {
switch code {
case http.StatusEarlyHints:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script"}, header["Link"])
case http.StatusProcessing:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, header["Link"])
default:
t.Error("Unexpected 1xx response")
}
respCounter++
return nil
},
}
req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, server.URL, nil)
res, err := frontendClient.Do(req)
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assert.NoError(t, err)
defer res.Body.Close()
if respCounter != 2 {
t.Errorf("Expected 2 1xx responses; got %d", respCounter)
}
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, res.Header["Link"])
body, _ := io.ReadAll(res.Body)
if string(body) != "Hello" {
t.Errorf("Read body %q; want Hello", body)
}
}