// Copyright The Prometheus Authors

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

package httpserver

import (

"context"

"errors"

"net/http"

"net/http/httptest"

"testing"

"testing/synctest"

"github.com/prometheus/common/route"

"github.com/stretchr/testify/require"

)

// serveReload runs the reload handler in a separate goroutine and returns

// the recorder plus a channel closed when the handler returns.

func serveReload(ctx context.Context, router *route.Router) (*httptest.ResponseRecorder, <-chan struct{}) {

w := httptest.NewRecorder()

done := make(chan struct{})

go func() {

defer close(done)

req := httptest.NewRequest(http.MethodPost, "/-/reload", nil).WithContext(ctx)

router.ServeHTTP(w, req)

}()

return w, done

}

func TestReloadSuccess(t *testing.T) {

synctest.Test(t, func(t *testing.T) {

reloadCh := make(chan chan error)

router := route.New()

Register(router, reloadCh)

w, done := serveReload(t.Context(), router)

errc := <-reloadCh

errc <- nil

<-done

require.Equal(t, http.StatusOK, w.Code)

})

}

func TestReloadError(t *testing.T) {

synctest.Test(t, func(t *testing.T) {

reloadCh := make(chan chan error)

router := route.New()

Register(router, reloadCh)

w, done := serveReload(t.Context(), router)

errc := <-reloadCh

errc <- errors.New("bad config")

<-done

require.Equal(t, http.StatusInternalServerError, w.Code)

require.Contains(t, w.Body.String(), "bad config")

})

}

func TestReloadClientDisconnectBeforeEnqueue(t *testing.T) {

synctest.Test(t, func(t *testing.T) {

// reloadCh is never consumed, so the handler blocks on enqueue.

// Cancelling the context should unblock it.

reloadCh := make(chan chan error)

router := route.New()

Register(router, reloadCh)

ctx, cancel := context.WithCancel(t.Context())

w, done := serveReload(ctx, router)

// Wait until the handler is durably blocked on the reloadCh send.

synctest.Wait()

cancel()

<-done

require.Equal(t, http.StatusServiceUnavailable, w.Code)

})

}

func TestReloadClientDisconnectDuringReload(t *testing.T) {

synctest.Test(t, func(t *testing.T) {

// The handler enqueues successfully but the client disconnects

// before the reload result arrives. The buffered channel ensures

// the sender does not block.

reloadCh := make(chan chan error)

router := route.New()

Register(router, reloadCh)

ctx, cancel := context.WithCancel(t.Context())

w, done := serveReload(ctx, router)

errc := <-reloadCh

cancel()

<-done

require.Equal(t, http.StatusServiceUnavailable, w.Code)

// Simulate the reloader sending the result after the handler has

// already returned. This must not block thanks to the buffered

// channel; if it did, synctest would report a deadlock.

errc <- nil

})

}

func TestDebugHandlersWithRoutePrefix(t *testing.T) {

reloadCh := make(chan chan error)

// Test with route prefix

routePrefix := "/prometheus/alertmanager"

router := route.New().WithPrefix(routePrefix)

Register(router, reloadCh)

// Test GET request to pprof index (note: pprof index returns text/html)

req := httptest.NewRequest("GET", routePrefix+"/debug/pprof/", nil)

w := httptest.NewRecorder()

router.ServeHTTP(w, req)

require.Equal(t, http.StatusOK, w.Code)

require.Contains(t, w.Body.String(), "/debug/pprof/", "pprof page did not load with expected content when using a route prefix")

// Test GET request to pprof heap endpoint

req = httptest.NewRequest("GET", routePrefix+"/debug/pprof/heap", nil)

w = httptest.NewRecorder()

router.ServeHTTP(w, req)

require.Equal(t, http.StatusOK, w.Code)

// Test without route prefix (should also work)

router2 := route.New()

Register(router2, reloadCh)

req = httptest.NewRequest("GET", "/debug/pprof/", nil)

w = httptest.NewRecorder()

router2.ServeHTTP(w, req)

require.Equal(t, http.StatusOK, w.Code)

require.Contains(t, w.Body.String(), "/debug/pprof/", "pprof page did not load with expected content")

}