traefik/pkg/middlewares/customerrors/custom_errors_test.go

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package customerrors
import (
"context"
"fmt"
"net/http"
"net/http/httptest"
"testing"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/testhelpers"
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"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestHandler(t *testing.T) {
testCases := []struct {
desc string
errorPage *dynamic.ErrorPage
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backendCode int
backendErrorHandler http.HandlerFunc
validate func(t *testing.T, recorder *httptest.ResponseRecorder)
}{
{
desc: "no error",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
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backendCode: http.StatusOK,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "My error page.")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
assert.Equal(t, http.StatusOK, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), http.StatusText(http.StatusOK))
},
},
{
desc: "no error, but not a 200",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
backendCode: http.StatusPartialContent,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "My error page.")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
assert.Equal(t, http.StatusPartialContent, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), http.StatusText(http.StatusPartialContent))
},
},
{
desc: "a 304, so no Write called",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
backendCode: http.StatusNotModified,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "whatever, should not be called")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
assert.Equal(t, http.StatusNotModified, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "")
},
},
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{
desc: "in the range",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
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backendCode: http.StatusInternalServerError,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "My error page.")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
assert.Equal(t, http.StatusInternalServerError, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "My error page.")
assert.NotContains(t, recorder.Body.String(), "oops", "Should not return the oops page")
},
},
{
desc: "not in the range",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
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backendCode: http.StatusBadGateway,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "My error page.")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
assert.Equal(t, http.StatusBadGateway, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), http.StatusText(http.StatusBadGateway))
assert.NotContains(t, recorder.Body.String(), "Test Server", "Should return the oops page since we have not configured the 502 code")
},
},
{
desc: "query replacement",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/{status}", Status: []string{"503-503"}},
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backendCode: http.StatusServiceUnavailable,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.RequestURI == "/503" {
fmt.Fprintln(w, "My 503 page.")
} else {
fmt.Fprintln(w, "Failed")
}
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
assert.Equal(t, http.StatusServiceUnavailable, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "My 503 page.")
assert.NotContains(t, recorder.Body.String(), "oops", "Should not return the oops page")
},
},
{
desc: "Single code",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/{status}", Status: []string{"503"}},
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backendCode: http.StatusServiceUnavailable,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.RequestURI == "/503" {
fmt.Fprintln(w, "My 503 page.")
} else {
fmt.Fprintln(w, "Failed")
}
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
assert.Equal(t, http.StatusServiceUnavailable, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "My 503 page.")
assert.NotContains(t, recorder.Body.String(), "oops", "Should not return the oops page")
},
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
serviceBuilderMock := &mockServiceBuilder{handler: test.backendErrorHandler}
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(test.backendCode)
if test.backendCode == http.StatusNotModified {
return
}
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fmt.Fprintln(w, http.StatusText(test.backendCode))
})
errorPageHandler, err := New(context.Background(), handler, *test.errorPage, serviceBuilderMock, "test")
require.NoError(t, err)
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost/test", nil)
recorder := httptest.NewRecorder()
errorPageHandler.ServeHTTP(recorder, req)
test.validate(t, recorder)
})
}
}
type mockServiceBuilder struct {
handler http.Handler
}
func (m *mockServiceBuilder) BuildHTTP(_ context.Context, serviceName string, responseModifier func(*http.Response) error) (http.Handler, error) {
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return m.handler, nil
}
func TestNewResponseRecorder(t *testing.T) {
testCases := []struct {
desc string
rw http.ResponseWriter
expected http.ResponseWriter
}{
{
desc: "Without Close Notify",
rw: httptest.NewRecorder(),
expected: &responseRecorderWithoutCloseNotify{},
},
{
desc: "With Close Notify",
rw: &mockRWCloseNotify{},
expected: &responseRecorderWithCloseNotify{},
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
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rec := newResponseRecorder(context.Background(), test.rw)
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assert.IsType(t, rec, test.expected)
})
}
}
type mockRWCloseNotify struct{}
func (m *mockRWCloseNotify) CloseNotify() <-chan bool {
panic("implement me")
}
func (m *mockRWCloseNotify) Header() http.Header {
panic("implement me")
}
func (m *mockRWCloseNotify) Write([]byte) (int, error) {
panic("implement me")
}
func (m *mockRWCloseNotify) WriteHeader(int) {
panic("implement me")
}