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kurl_context.go
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kurl_context.go
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package template
import (
"context"
"fmt"
"reflect"
"sort"
"strconv"
"strings"
"text/template"
"github.com/replicatedhq/kots/pkg/k8sutil"
kurlclientset "github.com/replicatedhq/kurl/kurlkinds/client/kurlclientset/typed/cluster/v1beta1"
kurlv1beta1 "github.com/replicatedhq/kurl/kurlkinds/pkg/apis/cluster/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
var (
// TestingDisableKurlValues should be set to true for testing purposes only.
// This disables the need for a Kubernetes cluster when running unit tests.
TestingDisableKurlValues = false
)
// getKurlValues returns the values found in the specified installer and namespace, if it exists
// otherwise it returns the values found in the first installer in the specified namespace, if one exists
// otherwise it returns nil
func getKurlValues(installerName, nameSpace string) *kurlv1beta1.Installer {
if TestingDisableKurlValues {
return nil
}
cfg, err := k8sutil.GetClusterConfig()
if err != nil {
return nil
}
clientset := kurlclientset.NewForConfigOrDie(cfg)
installers := clientset.Installers(nameSpace)
retrieved, err := installers.Get(context.TODO(), installerName, metav1.GetOptions{})
if err == nil && retrieved != nil {
return retrieved
}
allInstallers, err := installers.List(context.TODO(), metav1.ListOptions{})
if err != nil {
return nil
}
if allInstallers == nil || len(allInstallers.Items) == 0 {
return nil
}
newestInstaller := allInstallers.Items[0]
for _, installer := range allInstallers.Items {
if installer.CreationTimestamp.After(newestInstaller.CreationTimestamp.Time) {
newestInstaller = installer
}
}
return &newestInstaller
}
func newKurlContext(installerName, nameSpace string) *kurlCtx {
ctx := &kurlCtx{
KurlValues: make(map[string]interface{}),
}
retrieved := getKurlValues(installerName, nameSpace)
if retrieved != nil {
ctx.AddValuesToKurlContext(retrieved)
}
return ctx
}
func (ctx kurlCtx) AddValuesToKurlContext(retrieved *kurlv1beta1.Installer) {
Spec := reflect.ValueOf(retrieved.Spec)
for i := 0; i < Spec.NumField(); i++ {
Category := reflect.ValueOf(Spec.Field(i).Interface())
TypeOfCategory := Category.Type()
RawCategoryName := Category.String()
TrimmedRight := strings.Split(RawCategoryName, ".")[1]
CategoryName := strings.Split(TrimmedRight, " ")[0]
for i := 0; i < Category.NumField(); i++ {
if Category.Field(i).CanInterface() {
ctx.KurlValues[CategoryName+"."+TypeOfCategory.Field(i).Name] = Category.Field(i).Interface()
}
}
}
}
type kurlCtx struct {
KurlValues map[string]interface{}
}
func (ctx kurlCtx) FuncMap() template.FuncMap {
return template.FuncMap{
"KurlString": ctx.kurlString,
"KurlInt": ctx.kurlInt,
"KurlBool": ctx.kurlBool,
"KurlOption": ctx.kurlOption,
"KurlAll": ctx.kurlAll,
}
}
func (ctx kurlCtx) kurlBool(yamlPath string) bool {
if len(ctx.KurlValues) == 0 {
return false
}
result, ok := ctx.KurlValues[yamlPath]
if !ok {
fmt.Printf("There is no value found at the yamlPath ''%s'\n", yamlPath)
return false
}
b, ok := result.(bool)
if !ok {
fmt.Printf("The yamlPath '%s' corresponds to value '%v' of type '%T'. The KurlBool function supports only boolean values\n", yamlPath, result, result)
return false
}
return b
}
func (ctx kurlCtx) kurlInt(yamlPath string) int {
if len(ctx.KurlValues) == 0 {
return 0
}
result, ok := ctx.KurlValues[yamlPath]
if !ok {
fmt.Printf("There is no value found at the yamlPath '%s'\n", yamlPath)
return 0
}
i, ok := result.(int)
if !ok {
fmt.Printf("The yamlPath '%s' corresponds to value '%v' of type '%T'. The KurlInt function supports only integer values\n", yamlPath, result, result)
return 0
}
return i
}
func (ctx kurlCtx) kurlString(yamlPath string) string {
if len(ctx.KurlValues) == 0 {
return ""
}
result, ok := ctx.KurlValues[yamlPath]
if !ok {
fmt.Printf("There is no value found at the yamlPath '%s'\n", yamlPath)
return ""
}
s, ok := result.(string)
if !ok {
fmt.Printf("The yamlPath '%s' corresponds to value '%v' of type '%T'. The KurlString function supports only string values\n", yamlPath, result, result)
return ""
}
return s
}
func (ctx kurlCtx) kurlOption(yamlPath string) string {
if len(ctx.KurlValues) == 0 {
return ""
}
result, ok := ctx.KurlValues[yamlPath]
if !ok {
fmt.Printf("There is no value found at the yamlPath '%s'\n", yamlPath)
return ""
}
switch t := interface{}(result).(type) {
case int:
return strconv.Itoa(t)
case string:
return t
case bool:
return strconv.FormatBool(t)
default:
fmt.Printf("The yamlPath '%s' corresponds to value '%v' of type '%T'. The KurlOption function supports only string, integer, and boolean values\n", yamlPath, result, result)
return ""
}
}
func (ctx kurlCtx) kurlAll() string {
//debug function to show all supported k:v pairs
keys := make([]string, len(ctx.KurlValues))
i := 0
for k, v := range ctx.KurlValues {
switch t := interface{}(v).(type) {
case int:
keys[i] = k + ":" + strconv.Itoa(t)
case string:
keys[i] = k + ":" + t
case bool:
keys[i] = k + ":" + strconv.FormatBool(t)
}
i++
}
sort.Strings(keys)
return strings.Join(keys, " ")
}