Add kclient functions for creating deployments

pkg/kclient/deployments.go

@@ -0,0 +1,35 @@
+package kclient
+
+import (
+	"github.com/pkg/errors"
+	appsv1 "k8s.io/api/apps/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// constants for deployments
+const (
+	DeploymentKind       = "Deployment"
+	DeploymentAPIVersion = "apps/v1"
+)
+
+// CreateDeployment creates a deployment based on the given deployment spec
+func (c *Client) CreateDeployment(name string, deploymentSpec appsv1.DeploymentSpec) (*appsv1.Deployment, error) {
+	// inherit ObjectMeta from deployment spec so that namespace, labels, owner references etc will be the same
+	objectMeta := deploymentSpec.Template.ObjectMeta
+	objectMeta.Name = name
+
+	deployment := appsv1.Deployment{
+		TypeMeta: metav1.TypeMeta{
+			Kind:       DeploymentKind,
+			APIVersion: DeploymentAPIVersion,
+		},
+		ObjectMeta: objectMeta,
+		Spec:       deploymentSpec,
+	}
+
+	deploy, err := c.KubeClient.AppsV1().Deployments(c.Namespace).Create(&deployment)
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to create Deployment %s", name)
+	}
+	return deploy, nil
+}

pkg/kclient/deployments_test.go

@@ -0,0 +1,86 @@
+package kclient
+
+import (
+	"testing"
+
+	"github.com/pkg/errors"
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+
+	ktesting "k8s.io/client-go/testing"
+)
+
+func TestCreateDeployment(t *testing.T) {
+
+	container := GenerateContainer("container1", "image1", true, []string{"tail"}, []string{"-f", "/dev/null"}, []corev1.EnvVar{})
+
+	labels := map[string]string{
+		"app":       "app",
+		"component": "frontend",
+	}
+
+	podSpec := GeneratePodTemplateSpec("", "defualt", "default", labels, []corev1.Container{*container})
+
+	tests := []struct {
+		name           string
+		deploymentName string
+		wantErr        bool
+	}{
+		{
+			name:           "Case: Valid deployment name",
+			deploymentName: "pod",
+			wantErr:        false,
+		},
+		{
+			name:           "Case: Invalid deployment name",
+			deploymentName: "",
+			wantErr:        true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// initialising the fakeclient
+			fkclient, fkclientset := FakeNew()
+			fkclient.Namespace = "default"
+
+			fkclientset.Kubernetes.PrependReactor("create", "deployments", func(action ktesting.Action) (bool, runtime.Object, error) {
+				if tt.deploymentName == "" {
+					return true, nil, errors.Errorf("deployment name is empty")
+				}
+				deployment := appsv1.Deployment{
+					TypeMeta: metav1.TypeMeta{
+						Kind:       DeploymentKind,
+						APIVersion: DeploymentAPIVersion,
+					},
+					ObjectMeta: metav1.ObjectMeta{
+						Name: tt.deploymentName,
+					},
+				}
+				return true, &deployment, nil
+			})
+
+			deploymentSpec := GenerateDeploymentSpec(*podSpec)
+			createdDeployment, err := fkclient.CreateDeployment(tt.deploymentName, *deploymentSpec)
+
+			// Checks for unexpected error cases
+			if !tt.wantErr == (err != nil) {
+				t.Errorf("fkclient.CreateDeployment(pod) unexpected error %v, wantErr %v", err, tt.wantErr)
+			}
+
+			if err == nil {
+
+				if len(fkclientset.Kubernetes.Actions()) != 1 {
+					t.Errorf("expected 1 action in StartDeployment got: %v", fkclientset.Kubernetes.Actions())
+				} else {
+					if createdDeployment.Name != tt.deploymentName {
+						t.Errorf("deployment name does not match the expected name, expected: %s, got %s", tt.deploymentName, createdDeployment.Name)
+					}
+				}
+
+			}
+
+		})
+	}
+}

pkg/kclient/generators.go

@@ -0,0 +1,60 @@
+package kclient
+
+import (
+
+	// api resource types
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// GenerateContainer creates a container spec that can be used when creating a pod
+func GenerateContainer(name, image string, isPrivileged bool, command, args []string, envVars []corev1.EnvVar) *corev1.Container {
+	container := &corev1.Container{
+		Name:            name,
+		Image:           image,
+		ImagePullPolicy: corev1.PullAlways,
+
+		Command: command,
+		Args:    args,
+		Env:     envVars,
+	}
+
+	if isPrivileged {
+		container.SecurityContext = &corev1.SecurityContext{
+			Privileged: &isPrivileged,
+		}
+	}
+
+	return container
+}
+
+// GeneratePodTemplateSpec creates a pod template spec that can be used to create a deployment spec
+func GeneratePodTemplateSpec(podName, namespace, serviceAccountName string, labels map[string]string, containers []corev1.Container) *corev1.PodTemplateSpec {
+	podTemplateSpec := &corev1.PodTemplateSpec{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      podName,
+			Namespace: namespace,
+			Labels:    labels,
+		},
+		Spec: corev1.PodSpec{
+			ServiceAccountName: serviceAccountName,
+			Containers:         containers,
+		},
+	}
+
+	return podTemplateSpec
+}
+
+// GenerateDeploymentSpec creates a deployment spec
+func GenerateDeploymentSpec(podTemplateSpec corev1.PodTemplateSpec) *appsv1.DeploymentSpec {
+	labels := podTemplateSpec.ObjectMeta.Labels
+	deploymentSpec := &appsv1.DeploymentSpec{
+		Selector: &metav1.LabelSelector{
+			MatchLabels: labels,
+		},
+		Template: podTemplateSpec,
+	}
+
+	return deploymentSpec
+}

pkg/kclient/generators_test.go

@@ -0,0 +1,154 @@
+package kclient
+
+import (
+	"testing"
+
+	corev1 "k8s.io/api/core/v1"
+)
+
+func TestGenerateContainer(t *testing.T) {
+
+	tests := []struct {
+		name         string
+		image        string
+		isPrivileged bool
+		command      []string
+		args         []string
+		envVars      []corev1.EnvVar
+	}{
+		{
+			name:         "",
+			image:        "",
+			isPrivileged: false,
+			command:      []string{},
+			args:         []string{},
+			envVars:      []corev1.EnvVar{},
+		},
+		{
+			name:         "container1",
+			image:        "quay.io/eclipse/che-java8-maven:nightly",
+			isPrivileged: true,
+			command:      []string{"tail"},
+			args:         []string{"-f", "/dev/null"},
+			envVars: []corev1.EnvVar{
+				{
+					Name:  "test",
+					Value: "123",
+				},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+
+			container := GenerateContainer(tt.name, tt.image, tt.isPrivileged, tt.command, tt.args, tt.envVars)
+
+			if container.Name != tt.name {
+				t.Errorf("expected %s, actual %s", tt.name, container.Name)
+			}
+
+			if container.Image != tt.image {
+				t.Errorf("expected %s, actual %s", tt.image, container.Image)
+			}
+
+			if tt.isPrivileged {
+				if *container.SecurityContext.Privileged != tt.isPrivileged {
+					t.Errorf("expected %t, actual %t", tt.isPrivileged, *container.SecurityContext.Privileged)
+				}
+			} else if tt.isPrivileged == false && container.SecurityContext != nil {
+				t.Errorf("expected security context to be nil but it was defined")
+			}
+
+			if len(container.Command) != len(tt.command) {
+				t.Errorf("expected %d, actual %d", len(tt.command), len(container.Command))
+			} else {
+				for i := range container.Command {
+					if container.Command[i] != tt.command[i] {
+						t.Errorf("expected %s, actual %s", tt.command[i], container.Command[i])
+					}
+				}
+			}
+
+			if len(container.Args) != len(tt.args) {
+				t.Errorf("expected %d, actual %d", len(tt.args), len(container.Args))
+			} else {
+				for i := range container.Args {
+					if container.Args[i] != tt.args[i] {
+						t.Errorf("expected %s, actual %s", tt.args[i], container.Args[i])
+					}
+				}
+			}
+
+			if len(container.Env) != len(tt.envVars) {
+				t.Errorf("expected %d, actual %d", len(tt.envVars), len(container.Env))
+			} else {
+				for i := range container.Env {
+					if container.Env[i].Name != tt.envVars[i].Name {
+						t.Errorf("expected name %s, actual name %s", tt.envVars[i].Name, container.Env[i].Name)
+					}
+					if container.Env[i].Value != tt.envVars[i].Value {
+						t.Errorf("expected value %s, actual value %s", tt.envVars[i].Value, container.Env[i].Value)
+					}
+				}
+			}
+
+		})
+	}
+}
+
+func TestGeneratePodSpec(t *testing.T) {
+
+	container := &corev1.Container{
+		Name:            "container1",
+		Image:           "image1",
+		ImagePullPolicy: corev1.PullAlways,
+
+		Command: []string{"tail"},
+		Args:    []string{"-f", "/dev/null"},
+		Env:     []corev1.EnvVar{},
+	}
+
+	tests := []struct {
+		podName        string
+		namespace      string
+		serviceAccount string
+		labels         map[string]string
+	}{
+		{
+			podName:        "podSpecTest",
+			namespace:      "default",
+			serviceAccount: "default",
+			labels: map[string]string{
+				"app":       "app",
+				"component": "frontend",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.podName, func(t *testing.T) {
+
+			podSpec := GeneratePodTemplateSpec(tt.podName, tt.namespace, tt.serviceAccount, tt.labels, []corev1.Container{*container})
+
+			if podSpec.Name != tt.podName {
+				t.Errorf("expected %s, actual %s", tt.podName, podSpec.Name)
+			}
+
+			if podSpec.Namespace != tt.namespace {
+				t.Errorf("expected %s, actual %s", tt.namespace, podSpec.Namespace)
+			}
+
+			if len(podSpec.Labels) != len(tt.labels) {
+				t.Errorf("expected %d, actual %d", len(tt.labels), len(podSpec.Labels))
+			} else {
+				for i := range podSpec.Labels {
+					if podSpec.Labels[i] != tt.labels[i] {
+						t.Errorf("expected %s, actual %s", tt.labels[i], podSpec.Labels[i])
+					}
+				}
+			}
+
+		})
+	}
+}