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render.go
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render.go
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/*
Copyright Kurator 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 plugin
import (
"bytes"
"html/template"
"io/fs"
"github.com/Masterminds/sprig/v3"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/yaml"
)
type FleetPluginConfig struct {
Name string
Component string
Fleet types.NamespacedName
OwnerReference *metav1.OwnerReference
Cluster *KubeConfigSecretRef
Chart ChartConfig
Values map[string]interface{}
}
func (plugin FleetPluginConfig) ResourceName() string {
if plugin.Cluster != nil {
return plugin.Component + "-" + plugin.Cluster.Name
}
return plugin.Component
}
func (plugin FleetPluginConfig) StorageNamespace() string {
// StorageNamespace is the namespace where the plugin stores its data
// It's same as the target namespace for cluster scoped plugins
if plugin.Cluster != nil {
return plugin.Chart.TargetNamespace
}
return plugin.Fleet.Namespace
}
type KubeConfigSecretRef struct {
Name string
SecretName string
SecretKey string
}
type ChartConfig struct {
Type string
Repo string
Name string
Version string
TargetNamespace string
Values map[string]interface{}
}
func getFleetPluginChart(fsys fs.FS, pluginName string) (*ChartConfig, error) {
out, err := fs.ReadFile(fsys, "plugins/"+pluginName+".yaml")
if err != nil {
return nil, err
}
var c ChartConfig
if err := yaml.Unmarshal(out, &c); err != nil {
return nil, err
}
return &c, nil
}
func renderFleetPlugin(fsys fs.FS, cfg FleetPluginConfig) ([]byte, error) {
out, err := fs.ReadFile(fsys, "plugin.tpl")
if err != nil {
return nil, err
}
t := template.New("fleet plugin template")
tpl, err := t.Funcs(funMap()).Parse(string(out))
if err != nil {
return nil, err
}
var b bytes.Buffer
if err := tpl.Execute(&b, cfg); err != nil {
return nil, err
}
return b.Bytes(), nil
}
func funMap() template.FuncMap {
m := sprig.TxtFuncMap()
m["toYaml"] = toYaml
return m
}
func toYaml(value interface{}) string {
y, err := yaml.Marshal(value)
if err != nil {
return ""
}
return string(y)
}