mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-18 04:25:31 +00:00
99 lines
2.4 KiB
Go
99 lines
2.4 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package plugins
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import (
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"fmt"
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"path/filepath"
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"plugin"
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"github.com/pkg/errors"
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"sigs.k8s.io/kustomize/pkg/pgmconfig"
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"sigs.k8s.io/kustomize/pkg/resid"
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"sigs.k8s.io/kustomize/pkg/resmap"
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"sigs.k8s.io/kustomize/pkg/resource"
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)
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const generatorSymbol = "Generator"
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type Generatable interface {
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Generate() (resmap.ResMap, error)
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}
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type generatorLoader struct {
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pluginDir string
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enabled bool
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rf *resmap.Factory
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}
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func NewGeneratorLoader(b bool, f *resmap.Factory) generatorLoader {
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return generatorLoader{
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pluginDir: filepath.Join(pgmconfig.ConfigRoot(), pgmconfig.PluginsDir),
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enabled: b,
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rf: f,
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}
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}
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func (l generatorLoader) Load(rm resmap.ResMap) (resmap.ResMap, error) {
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if len(rm) == 0 {
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return nil, nil
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}
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if !l.enabled {
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return nil, fmt.Errorf("plugin is not enabled")
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}
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var result resmap.ResMap
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for id, res := range rm {
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r, err := l.load(id, res)
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if err != nil {
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return nil, err
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}
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result, err = resmap.MergeWithErrorOnIdCollision(result, r)
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if err != nil {
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return nil, err
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}
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}
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return result, nil
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}
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func (l generatorLoader) load(id resid.ResId, res *resource.Resource) (resmap.ResMap, error) {
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fileName := filepath.Join(l.pluginDir, id.Gvk().Kind+".so")
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goPlugin, err := plugin.Open(fileName)
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if err != nil {
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return nil, fmt.Errorf("plugin %s file not opened", fileName)
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}
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symbol, err := goPlugin.Lookup(generatorSymbol)
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if err != nil {
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return nil, fmt.Errorf("plugin %s fails lookup", fileName)
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}
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c, ok := symbol.(Configurable)
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if !ok {
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return nil, fmt.Errorf("plugin %s not configurable", fileName)
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}
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err = c.Config(res)
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if err != nil {
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return nil, errors.Wrapf(err, "plugin %s fails configuration", fileName)
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}
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g, ok := c.(Generatable)
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if !ok {
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return nil, fmt.Errorf("plugin %s not a transformer", fileName)
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}
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return g.Generate()
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}
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