Add healthz tests

pkg/ingress/controller/checker_test.go

@@ -0,0 +1,137 @@
+/*
+Copyright 2017 The Kubernetes 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 controller
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"os/exec"
+	"testing"
+
+	"k8s.io/apiserver/pkg/server/healthz"
+	"k8s.io/kubernetes/pkg/util/filesystem"
+
+	ngx_config "k8s.io/ingress-nginx/pkg/ingress/controller/config"
+)
+
+func TestNginxCheck(t *testing.T) {
+	mux := http.NewServeMux()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintf(w, "ok")
+	}))
+	defer server.Close()
+	// port to be used in the check
+	p := server.Listener.Addr().(*net.TCPAddr).Port
+
+	// mock filesystem
+	fs := filesystem.NewFakeFs()
+
+	n := &NGINXController{
+		cfg: &Configuration{
+			ListenPorts: &ngx_config.ListenPorts{
+				Status: p,
+			},
+		},
+		fileSystem: fs,
+	}
+
+	t.Run("no pid or process", func(t *testing.T) {
+		if err := callHealthz(true, mux); err == nil {
+			t.Errorf("expected an error but none returned")
+		}
+	})
+
+	// create required files
+	fs.MkdirAll("/run", 0655)
+	pidFile, err := fs.Create("/run/nginx.pid")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	t.Run("no process", func(t *testing.T) {
+		if err := callHealthz(true, mux); err == nil {
+			t.Errorf("expected an error but none returned")
+		}
+	})
+
+	// start dummy process to use the PID
+	cmd := exec.Command("sleep", "3600")
+	cmd.Start()
+	pid := cmd.Process.Pid
+	defer cmd.Process.Kill()
+	go func() {
+		cmd.Wait()
+	}()
+
+	pidFile.Write([]byte(fmt.Sprintf("%v", pid)))
+	pidFile.Close()
+
+	healthz.InstallHandler(mux, n)
+
+	t.Run("valid request", func(t *testing.T) {
+		if err := callHealthz(false, mux); err != nil {
+			t.Error(err)
+		}
+	})
+
+	pidFile, err = fs.Create("/run/nginx.pid")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	pidFile.Write([]byte(fmt.Sprintf("%v", pid)))
+	pidFile.Close()
+
+	t.Run("valid request", func(t *testing.T) {
+		if err := callHealthz(true, mux); err == nil {
+			t.Errorf("expected an error but none returned")
+		}
+	})
+
+	t.Run("invalid port", func(t *testing.T) {
+		n.cfg.ListenPorts.Status = 9000
+		if err := callHealthz(true, mux); err == nil {
+			t.Errorf("expected an error but none returned")
+		}
+	})
+}
+
+func callHealthz(expErr bool, mux *http.ServeMux) error {
+	req, err := http.NewRequest("GET", "http://localhost:8080/healthz", nil)
+	if err != nil {
+		return err
+	}
+	w := httptest.NewRecorder()
+	mux.ServeHTTP(w, req)
+
+	if expErr && w.Code != http.StatusInternalServerError {
+		return fmt.Errorf("expected an error")
+	}
+
+	if w.Body.String() != "ok" {
+		return fmt.Errorf("healthz error: %v", w.Body.String())
+	}
+
+	if w.Code != http.StatusOK {
+		return fmt.Errorf("expected status code 200 but %v returned", w.Code)
+	}
+
+	return nil
+}