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boxService.go
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boxService.go
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// Package services contains buisness-logic methods of the models
package services
import (
"errors"
"fmt"
"os"
"strings"
"github.com/joho/godotenv"
"github.com/twelvee/k8sbox/pkg/k8sbox/structs"
"github.com/twelvee/k8sbox/pkg/k8sbox/utils"
"helm.sh/helm/v3/pkg/chart/loader"
"helm.sh/helm/v3/pkg/chartutil"
"helm.sh/helm/v3/pkg/engine"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/cli-runtime/pkg/resource"
"k8s.io/client-go/kubernetes"
)
// NewBoxService creates a new BoxService
func NewBoxService() structs.BoxService {
return structs.BoxService{
ProcessEnvValues: processEnvValues,
ValidateBoxes: validateBoxes,
FillEmptyFields: fillEmptyFields,
UninstallBox: UninstallBox,
DescribeBoxApplications: DescribeBoxApplications,
ExpandBoxVariables: expandBoxVariables,
}
}
func fillEmptyFields(box *structs.Box, environmentNamespace string) error {
if len(strings.TrimSpace(box.Namespace)) == 0 {
if len(strings.TrimSpace(environmentNamespace)) == 0 {
box.Namespace = strings.ToLower(strings.Join([]string{"k8srun", utils.GetShortNamespace(8)}, "-"))
} else {
box.Namespace = environmentNamespace
}
}
if len(strings.TrimSpace(box.Name)) == 0 {
box.Name = strings.ToLower(strings.Join([]string{"k8srun", utils.GetShortNamespace(8)}, "-"))
}
return nil
}
func processEnvValues(values map[string]interface{}, dotenvPath string) map[string]interface{} {
if len(dotenvPath) > 0 {
godotenv.Load(dotenvPath)
}
for k, v := range values {
if len(os.ExpandEnv(fmt.Sprintf("%v", v))) == 0 {
continue
}
values[k] = os.ExpandEnv(fmt.Sprintf("%v", v))
}
return values
}
func validateBoxes(boxes []structs.Box) error {
var messages []string
for index, box := range boxes {
if len(strings.TrimSpace(box.Type)) == 0 {
messages = append(messages, fmt.Sprintf("-> Box %d: Type is missing", index))
}
if len(box.Applications) == 0 {
messages = append(messages, fmt.Sprintf("-> Box %d: Applications are missing", index))
}
if len(strings.TrimSpace(box.Chart)) == 0 {
messages = append(messages, fmt.Sprintf("-> Box %d: Chart is missing", index))
}
_, err := os.Stat(box.Chart)
if err != nil {
messages = append(messages, fmt.Sprintf("-> Box %d: Chart file can't be opened (%s)", index, box.Chart))
}
if len(strings.TrimSpace(box.Values)) == 0 {
messages = append(messages, fmt.Sprintf("-> Box %d: Values are missing", index))
}
_, err = os.Stat(box.Values)
if err != nil {
messages = append(messages, fmt.Sprintf("-> Box %d: Values file can't be opened (%s)", index, box.Values))
}
applicationsErrors := validateApplications(box.Applications)
if len(applicationsErrors) > 0 {
for _, err := range applicationsErrors {
messages = append(messages, fmt.Sprintf("-> Box %d: \n\r%s", index, err))
}
}
}
if len(messages) > 0 {
return errors.New(strings.Join(messages, "\n\r"))
}
return nil
}
// InstallBox will deploy your box applications into your k8s cluster
func InstallBox(box *structs.Box, environment structs.Environment) ([]*runtime.Object, error) {
var objects []*runtime.Object
_, restConfig := GetConfigFromKubeconfig(box.Namespace)
chart, err := loader.Load(box.TempDirectory)
if err != nil {
return nil, err
}
releaseOptions := chartutil.ReleaseOptions{
Name: box.Name,
Namespace: box.Namespace,
Revision: 1,
IsInstall: true,
}
e := engine.New(restConfig)
vals, err := chartutil.ToRenderValues(chart, processEnvValues(chart.Values, environment.Variables), releaseOptions, nil)
if err != nil {
return nil, err
}
render, err := e.Render(chart, vals)
if err != nil {
return nil, err
}
k8sclient, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return nil, err
}
r := utils.ConvertHelmRenderToYaml(render)
for _, rend := range r {
obj, err := utils.CreateRuntimeObject(rend)
if err != nil {
return nil, err
}
mapping, err := utils.CreateRestMapper(k8sclient, obj)
if err != nil {
return nil, err
}
restClient, err := utils.NewRestClient(*restConfig, mapping.GroupVersionKind.GroupVersion())
if err != nil {
return nil, err
}
// Use the REST helper to create the object in the box namespace.
restHelper := resource.NewHelper(restClient, mapping)
rtobj, err := restHelper.Create(box.Namespace, false, obj)
if err != nil {
return nil, err
}
objects = append(objects, &rtobj)
}
utils.SaveBox(*box, environment.ID)
return objects, nil
}
// UninstallBox will uninstall your box applications from your k8s cluster
func UninstallBox(box *structs.Box, environment structs.Environment) ([]*runtime.Object, error) {
var objects []*runtime.Object
_, restConfig := GetConfigFromKubeconfig(box.Namespace)
chart, err := loader.Load(box.TempDirectory)
if err != nil {
return nil, err
}
releaseOptions := chartutil.ReleaseOptions{
Name: box.Name,
Namespace: box.Namespace,
Revision: 1,
IsInstall: true,
}
e := engine.New(restConfig)
vals, err := chartutil.ToRenderValues(chart, processEnvValues(chart.Values, environment.Variables), releaseOptions, nil)
if err != nil {
return nil, err
}
render, err := e.Render(chart, vals)
if err != nil {
return nil, err
}
k8sclient, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return nil, err
}
r := utils.ConvertHelmRenderToYaml(render)
for _, rend := range r {
obj, err := utils.CreateRuntimeObject(rend)
if err != nil {
return nil, err
}
mapping, err := utils.CreateRestMapper(k8sclient, obj)
if err != nil {
return nil, err
}
restClient, err := utils.NewRestClient(*restConfig, mapping.GroupVersionKind.GroupVersion())
if err != nil {
return nil, err
}
// Use the REST helper to create the object in the box namespace.
restHelper := resource.NewHelper(restClient, mapping)
name, err := meta.NewAccessor().Name(obj)
if err != nil {
return nil, err
}
rtobj, err := restHelper.Delete(box.Namespace, name)
if err != nil {
return nil, err
}
objects = append(objects, &rtobj)
}
err = utils.RemoveBox(*box, environment.ID)
if err != nil {
return nil, err
}
return objects, nil
}
// DescrieBoxApplications will print a describe string of box applications
func DescribeBoxApplications(box *structs.Box, environment structs.Environment) error {
_, restConfig := GetConfigFromKubeconfig(box.Namespace)
chart, err := loader.Load(box.TempDirectory)
if err != nil {
return err
}
releaseOptions := chartutil.ReleaseOptions{
Name: box.Name,
Namespace: box.Namespace,
Revision: 1,
IsInstall: true,
}
e := engine.New(restConfig)
vals, err := chartutil.ToRenderValues(chart, processEnvValues(chart.Values, environment.Variables), releaseOptions, nil)
if err != nil {
return err
}
render, err := e.Render(chart, vals)
if err != nil {
return err
}
k8sclient, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return err
}
r := utils.ConvertHelmRenderToYaml(render)
for _, rend := range r {
obj, err := utils.CreateRuntimeObject(rend)
if err != nil {
return err
}
var describeFunc func(*kubernetes.Clientset, string, string) error
switch kind := obj.GetObjectKind().GroupVersionKind().Kind; kind {
case structs.KIND_POD:
describeFunc = describePod
case structs.KIND_POD_TEMPLATE:
describeFunc = describePodTemplate
case structs.KIND_REPLICATION_CONTROLLER:
describeFunc = describeReplicationController
case structs.KIND_REPLICA_SET:
describeFunc = describeReplicaSet
case structs.KIND_DEPLOYMENT:
describeFunc = describeDeployment
case structs.KIND_STATEFUL_SET:
describeFunc = describeStatefulSet
case structs.KIND_CONTROLLER_REVISION:
describeFunc = describeControllerRevision
case structs.KIND_DAEMON_SET:
describeFunc = describeDaemonSet
case structs.KIND_JOB:
describeFunc = describeJob
case structs.KIND_CRONJOB:
describeFunc = describeCronjob
case structs.KIND_HPA:
describeFunc = describeHPA
case structs.KIND_SERVICE:
describeFunc = describeService
case structs.KIND_INGRESS:
describeFunc = describeIngress
}
name, err := meta.NewAccessor().Name(obj)
if err != nil {
return err
}
err = describeFunc(k8sclient, box.Namespace, name)
if err != nil {
return err
}
fmt.Println()
}
return nil
}
func expandBoxVariables(boxes []structs.Box) []structs.Box {
var newBoxes []structs.Box
for _, b := range boxes {
b.Name = os.ExpandEnv(b.Name)
b.Namespace = os.ExpandEnv(b.Namespace)
b.Type = os.ExpandEnv(b.Type)
b.Chart = os.ExpandEnv(b.Chart)
b.Values = os.ExpandEnv(b.Values)
b.Applications = ExpandApplications(b.Applications)
newBoxes = append(newBoxes, b)
}
return newBoxes
}