InfluxDB annotations e2e tests

Signed-off-by: Lorenzo Fontana <lo@linux.com>

test/e2e/annotations/influxdb.go

@@ -0,0 +1,193 @@
+/*
+Copyright 2018 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 annotations
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os/exec"
+	"time"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/parnurzeal/gorequest"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/intstr"
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.IngressNginxDescribe("Annotations - influxdb", func() {
+	f := framework.NewDefaultFramework("influxdb")
+
+	BeforeEach(func() {
+		err := f.NewInfluxDBDeployment()
+		Expect(err).NotTo(HaveOccurred())
+		err = f.NewEchoDeployment()
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	Context("when influxdb is enabled", func() {
+		It("should send the request metric to the influxdb server", func() {
+			ifs, err := createInfluxDBService(f)
+
+			Expect(err).NotTo(HaveOccurred())
+
+			// Ingress configured with InfluxDB annotations
+			host := "influxdb.e2e.local"
+			createInfluxDBIngress(
+				f,
+				host,
+				"http-svc",
+				8080,
+				map[string]string{
+					"nginx.ingress.kubernetes.io/enable-influxdb":      "true",
+					"nginx.ingress.kubernetes.io/influxdb-host":        ifs.Spec.ClusterIP,
+					"nginx.ingress.kubernetes.io/influxdb-port":        "8089",
+					"nginx.ingress.kubernetes.io/influxdb-measurement": "requests",
+					"nginx.ingress.kubernetes.io/influxdb-servername":  "e2e-nginx-srv",
+				},
+			)
+
+			// Do a request to the echo server ingress that sends metrics
+			// to the InfluxDB backend.
+			res, _, errs := gorequest.New().
+				Get(f.IngressController.HTTPURL).
+				Set("Host", host).
+				End()
+
+			Expect(len(errs)).Should(Equal(0))
+			Expect(res.StatusCode).Should(Equal(http.StatusOK))
+
+			time.Sleep(5 * time.Second)
+			measurements, err := extractInfluxDBMeasurements(f)
+
+			var results map[string][]map[string]interface{}
+			json.Unmarshal([]byte(measurements), &results)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(measurements)).ShouldNot(Equal(0))
+			for _, elem := range results["results"] {
+				Expect(len(elem)).ShouldNot(Equal(0))
+			}
+		})
+	})
+})
+
+func createInfluxDBService(f *framework.Framework) (*corev1.Service, error) {
+	service := &corev1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "inflxudb-svc",
+			Namespace: f.IngressController.Namespace,
+		},
+		Spec: corev1.ServiceSpec{Ports: []corev1.ServicePort{
+			{
+				Name:       "udp",
+				Port:       8089,
+				TargetPort: intstr.FromInt(8089),
+				Protocol:   "UDP",
+			},
+		},
+			Selector: map[string]string{
+				"app": "influxdb-svc",
+			},
+		},
+	}
+
+	s, err := f.EnsureService(service)
+	if err != nil {
+		return nil, err
+	}
+
+	if s == nil {
+		return nil, fmt.Errorf("unexpected error creating service for influxdb deployment")
+	}
+
+	return s, nil
+}
+
+func createInfluxDBIngress(f *framework.Framework, host, service string, port int, annotations map[string]string) {
+	ing, err := f.EnsureIngress(framework.NewSingleIngress(host, "/", host, f.IngressController.Namespace, service, port, &annotations))
+	Expect(err).NotTo(HaveOccurred())
+	Expect(ing).NotTo(BeNil())
+
+	err = f.WaitForNginxServer(host,
+		func(server string) bool {
+			return Expect(server).Should(ContainSubstring(fmt.Sprintf("server_name %v", host))) &&
+				Expect(server).ShouldNot(ContainSubstring("return 503"))
+		})
+	Expect(err).NotTo(HaveOccurred())
+}
+
+func extractInfluxDBMeasurements(f *framework.Framework) (string, error) {
+	l, err := f.KubeClientSet.CoreV1().Pods(f.IngressController.Namespace).List(metav1.ListOptions{
+		LabelSelector: "app=influxdb-svc",
+	})
+	if err != nil {
+		return "", err
+	}
+
+	if len(l.Items) == 0 {
+		return "", err
+	}
+
+	cmd := "influx -database 'nginx' -execute 'select * from requests' -format 'json' -pretty"
+
+	var pod *corev1.Pod
+	for _, p := range l.Items {
+		pod = &p
+		break
+	}
+
+	if pod == nil {
+		return "", fmt.Errorf("no influxdb pods found")
+	}
+
+	o, err := execInfluxDBCommand(pod, cmd)
+	if err != nil {
+		return "", err
+	}
+
+	return o, nil
+}
+
+func execInfluxDBCommand(pod *corev1.Pod, command string) (string, error) {
+	var (
+		execOut bytes.Buffer
+		execErr bytes.Buffer
+	)
+
+	args := fmt.Sprintf("kubectl exec --namespace %v %v -- %v", pod.Namespace, pod.Name, command)
+	cmd := exec.Command("/bin/bash", "-c", args)
+	cmd.Stdout = &execOut
+	cmd.Stderr = &execErr
+
+	err := cmd.Run()
+
+	if execErr.Len() > 0 {
+		return "", fmt.Errorf("stderr: %v", execErr.String())
+	}
+
+	if err != nil {
+		return "", fmt.Errorf("could not execute: %v", err)
+	}
+
+	return execOut.String(), nil
+}