Add stream-snippet as a ConfigMap and Annotation option (#8029)

* stream snippet

* gofmt -s

test/e2e/settings/stream_snippet.go

@@ -0,0 +1,85 @@
+/*
+Copyright 2021 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 settings
+
+import (
+	"context"
+	"fmt"
+	"github.com/stretchr/testify/assert"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/intstr"
+	"net/http"
+	"strings"
+
+	"github.com/onsi/ginkgo"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.DescribeSetting("configmap stream-snippet", func() {
+	f := framework.NewDefaultFramework("cm-stream-snippet")
+
+	ginkgo.BeforeEach(func() {
+		f.NewEchoDeployment()
+	})
+
+	ginkgo.It("should add value of stream-snippet via config map to nginx config", func() {
+		host := "foo.com"
+		snippet := `server {listen 8000; proxy_pass 127.0.0.1:80;}`
+
+		f.SetNginxConfigMapData(map[string]string{
+			"stream-snippet": snippet,
+		})
+
+		ing := framework.NewSingleIngress(host, "/", host, f.Namespace, framework.EchoService, 80, nil)
+		f.EnsureIngress(ing)
+
+		svc, err := f.KubeClientSet.
+			CoreV1().
+			Services(f.Namespace).
+			Get(context.TODO(), "nginx-ingress-controller", metav1.GetOptions{})
+		assert.Nil(ginkgo.GinkgoT(), err, "unexpected error obtaining ingress-nginx service")
+		assert.NotNil(ginkgo.GinkgoT(), svc, "expected a service but none returned")
+
+		svc.Spec.Ports = append(svc.Spec.Ports, corev1.ServicePort{
+			Name:       framework.EchoService,
+			Port:       8000,
+			TargetPort: intstr.FromInt(8000),
+		})
+
+		_, err = f.KubeClientSet.
+			CoreV1().
+			Services(f.Namespace).
+			Update(context.TODO(), svc, metav1.UpdateOptions{})
+		assert.Nil(ginkgo.GinkgoT(), err, "unexpected error updating service")
+
+		// Sleep a while just to guarantee that the configmap is applied
+		framework.Sleep()
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return strings.Contains(cfg, snippet)
+			})
+
+		f.HTTPTestClient().
+			GET("/healthz").
+			WithURL(fmt.Sprintf("http://%v:8000/healthz", f.GetNginxIP())).
+			Expect().
+			Status(http.StatusOK)
+	})
+})