Start working on tests for auto discovery

config.yaml

@@ -19,7 +19,6 @@ kubernetes:
   cluster-mode: "out"
   auto-discover: true
   excluded-service-suffixes:
-    - primary
     - canary
   service-template:
     interval: 30s

config/config_test.go

@@ -2,9 +2,13 @@ package config
 
 import (
 	"fmt"
-	"github.com/TwinProduction/gatus/core"
+	"strings"
 	"testing"
 	"time"
+
+	"github.com/TwinProduction/gatus/core"
+	"github.com/TwinProduction/gatus/k8stest"
+	v1 "k8s.io/api/core/v1"
 )
 
 func TestGetBeforeConfigIsLoaded(t *testing.T) {
@@ -311,3 +315,84 @@ services:
 		t.Errorf("config.Security.Basic.PasswordSha512Hash should've been %s, but was %s", expectedPasswordHash, config.Security.Basic.PasswordSha512Hash)
 	}
 }
+
+func TestParseAndValidateConfigBytesWithNoServicesOrAutoDiscovery(t *testing.T) {
+	_, err := parseAndValidateConfigBytes([]byte(``))
+	if err != ErrNoServiceInConfig {
+		t.Error("The error returned should have been of type ErrNoServiceInConfig")
+	}
+}
+
+func TestParseAndValidateConfigBytesWithKubernetesAutoDiscovery(t *testing.T) {
+	var kubernetesServices []v1.Service
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-1", "default"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-2", "default"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-2-canary", "default"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-3", "kube-system"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-4", "tools"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-5", "tools"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-6", "tools"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-7", "metrics"))
+	kubernetesServices = append(kubernetesServices, k8stest.CreateTestServices("service-7-canary", "metrics"))
+	k8stest.InitializeMockedKubernetesClient(kubernetesServices)
+	config, err := parseAndValidateConfigBytes([]byte(`
+debug: true
+
+kubernetes:
+  cluster-mode: "mock"
+  auto-discover: true
+  excluded-service-suffixes:
+    - canary
+  service-template:
+    interval: 29s
+    conditions:
+      - "[STATUS] == 200"
+  namespaces:
+    - name: default
+      hostname-suffix: ".default.svc.cluster.local"
+      target-path: "/health"
+    - name: tools
+      hostname-suffix: ".tools.svc.cluster.local"
+      target-path: "/health"
+      excluded-services:
+        - service-6
+    - name: metrics
+      hostname-suffix: ".metrics.svc.cluster.local"
+      target-path: "/health"
+`))
+	if err != nil {
+		t.Error("No error should've been returned")
+	}
+	if config == nil {
+		t.Fatal("Config shouldn't have been nil")
+	}
+	if config.Kubernetes == nil {
+		t.Fatal("Kuberbetes config shouldn't have been nil")
+	}
+	if len(config.Services) != 5 {
+		t.Error("Expected 5 services to have been added through k8s auto discovery, got", len(config.Services))
+	}
+	for _, service := range config.Services {
+		if service.Name == "service-2-canary" || service.Name == "service-7-canary" {
+			t.Errorf("service '%s' should've been excluded because excluded-service-suffixes has 'canary'", service.Name)
+		} else if service.Name == "service-6" {
+			t.Errorf("service '%s' should've been excluded because excluded-services has 'service-6'", service.Name)
+		} else if service.Name == "service-3" {
+			t.Errorf("service '%s' should've been excluded because the namespace 'kube-system' is not configured for auto discovery", service.Name)
+		} else {
+			if service.Interval != 29*time.Second {
+				t.Errorf("service '%s' should've had an interval of 29s, because the template is configured for it", service.Name)
+			}
+			if len(service.Conditions) != 1 {
+				t.Errorf("service '%s' should've had 1 condition", service.Name)
+			}
+			if len(service.Conditions) == 1 && *service.Conditions[0] != "[STATUS] == 200" {
+				t.Errorf("service '%s' should've had the condition '[STATUS] == 200', because the template is configured for it", service.Name)
+			}
+			if !strings.HasSuffix(service.URL, ".svc.cluster.local/health") {
+				t.Errorf("service '%s' should've had an URL with the suffix '.svc.cluster.local/health'", service.Name)
+			}
+		}
+	}
+
+}

k8s/client.go

@@ -6,28 +6,64 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/TwinProduction/gatus/k8stest"
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
 )
 
+// KubernetesClientApi is a minimal interface for interacting with Kubernetes
+// Created mostly to make mocking the Kubernetes client easier
+type KubernetesClientApi interface {
+	GetServices(namespace string) ([]v1.Service, error)
+}
+
+// KubernetesClient is a working implementation of KubernetesClientApi
+type KubernetesClient struct {
+	client *kubernetes.Clientset
+}
+
+// GetServices returns a list of services for a given namespace
+func (k *KubernetesClient) GetServices(namespace string) ([]v1.Service, error) {
+	services, err := k.client.CoreV1().Services(namespace).List(metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	return services.Items, nil
+}
+
+// NewKubernetesClient creates a KubernetesClient
+func NewKubernetesClient(client *kubernetes.Clientset) *KubernetesClient {
+	return &KubernetesClient{
+		client: client,
+	}
+}
+
 // NewClient creates a Kubernetes client for the given ClusterMode
-func NewClient(clusterMode ClusterMode) (*kubernetes.Clientset, error) {
+func NewClient(clusterMode ClusterMode) (KubernetesClientApi, error) {
 	var kubeConfig *rest.Config
 	var err error
 	switch clusterMode {
 	case ClusterModeIn:
-		kubeConfig, err = getInClusterConfig()
+		kubeConfig, err = rest.InClusterConfig()
 	case ClusterModeOut:
 		kubeConfig, err = getOutClusterConfig()
+	case ClusterModeMock:
+		return k8stest.GetMockedKubernetesClient(), nil
 	default:
 		return nil, fmt.Errorf("invalid cluster mode, try '%s' or '%s'", ClusterModeIn, ClusterModeOut)
 	}
 	if err != nil {
 		return nil, fmt.Errorf("unable to get cluster config for mode '%s': %s", clusterMode, err.Error())
 	}
-	return kubernetes.NewForConfig(kubeConfig)
+	client, err := kubernetes.NewForConfig(kubeConfig)
+	if err != nil {
+		return nil, err
+	}
+	return NewKubernetesClient(client), nil
 }
 
 func homeDir() string {
@@ -47,7 +83,3 @@ func getOutClusterConfig() (*rest.Config, error) {
 	flag.Parse()
 	return clientcmd.BuildConfigFromFlags("", *kubeConfig)
 }
-
-func getInClusterConfig() (*rest.Config, error) {
-	return rest.InClusterConfig()
-}

k8s/config.go

@@ -39,6 +39,7 @@ type NamespaceConfig struct {
 type ClusterMode string
 
 const (
-	ClusterModeIn  ClusterMode = "in"
-	ClusterModeOut ClusterMode = "out"
+	ClusterModeIn   ClusterMode = "in"
+	ClusterModeOut  ClusterMode = "out"
+	ClusterModeMock ClusterMode = "mock"
 )

k8s/k8s.go

@@ -1,16 +1,10 @@
 package k8s
 
 import (
-	corev1 "k8s.io/api/core/v1"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/client-go/kubernetes"
+	"k8s.io/api/core/v1"
 )
 
-// GetKubernetesServices return List of Services from given namespace
-func GetKubernetesServices(client *kubernetes.Clientset, ns string) ([]corev1.Service, error) {
-	services, err := client.CoreV1().Services(ns).List(metav1.ListOptions{})
-	if err != nil {
-		return nil, err
-	}
-	return services.Items, nil
+// GetKubernetesServices return a list of Services from the given namespace
+func GetKubernetesServices(client KubernetesClientApi, namespace string) ([]v1.Service, error) {
+	return client.GetServices(namespace)
 }

k8stest/k8stest.go

@@ -0,0 +1,53 @@
+package k8stest
+
+import (
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+var (
+	mockedKubernetesClient *MockKubernetesClient
+)
+
+// MockKubernetesClient is a mocked implementation of k8s.KubernetesClientApi
+type MockKubernetesClient struct {
+	Services []v1.Service
+}
+
+// GetServices returns a list of services in a given namespace
+func (mock *MockKubernetesClient) GetServices(namespace string) ([]v1.Service, error) {
+	var services []v1.Service
+	for _, service := range mock.Services {
+		if service.Namespace == namespace {
+			services = append(services, service)
+		}
+	}
+	return services, nil
+}
+
+// GetMockedKubernetesClient returns a mocked implementation of k8s.KubernetesClientApi
+func GetMockedKubernetesClient() *MockKubernetesClient {
+	if mockedKubernetesClient != nil {
+		return mockedKubernetesClient
+	}
+	InitializeMockedKubernetesClient(nil)
+	return mockedKubernetesClient
+}
+
+// InitializeMockedKubernetesClient initializes a MockKubernetesClient with a given list of services
+func InitializeMockedKubernetesClient(services []v1.Service) {
+	mockedKubernetesClient = &MockKubernetesClient{
+		Services: services,
+	}
+}
+
+// CreateTestServices creates a mocked service for testing purposes
+func CreateTestServices(name, namespace string) v1.Service {
+	return v1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+		},
+		Spec: v1.ServiceSpec{},
+	}
+}

metric/metric.go

@@ -2,12 +2,13 @@ package metric
 
 import (
 	"fmt"
+	"strconv"
+	"sync"
+
 	"github.com/TwinProduction/gatus/config"
 	"github.com/TwinProduction/gatus/core"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
-	"strconv"
-	"sync"
 )
 
 var (