258 lines
6.8 KiB
Go
258 lines
6.8 KiB
Go
/*
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Copyright 2018 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 app
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import (
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"bytes"
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"encoding/json"
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"github.com/ghodss/yaml"
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"k8s.io/kubectl/pkg/kustomize/constants"
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interror "k8s.io/kubectl/pkg/kustomize/internal/error"
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"k8s.io/kubectl/pkg/kustomize/resource"
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"k8s.io/kubectl/pkg/kustomize/transformers"
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"k8s.io/kubectl/pkg/kustomize/types"
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"k8s.io/kubectl/pkg/loader"
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)
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type Application interface {
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// Resources computes and returns the resources for the app.
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Resources() (resource.ResourceCollection, error)
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// SemiResources computes and returns the resources without name hash and name reference for the app
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SemiResources() (resource.ResourceCollection, error)
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// RawResources computes and returns the raw resources from the kustomize config file.
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// It contains resources from
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// 1) untransformed resources from current kustomize config file
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// 2) transformed resources from sub packages
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RawResources() (resource.ResourceCollection, error)
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}
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var _ Application = &applicationImpl{}
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// Private implementation of the Application interface
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type applicationImpl struct {
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manifest *types.Manifest
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loader loader.Loader
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}
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// NewApp parses the kustomize config file at the path using the loader.
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func New(loader loader.Loader) (Application, error) {
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// load the kustomize config file using the loader
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manifestBytes, err := loader.Load(constants.KustomizeFileName)
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if err != nil {
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return nil, err
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}
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var m types.Manifest
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err = unmarshal(manifestBytes, &m)
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if err != nil {
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return nil, err
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}
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return &applicationImpl{manifest: &m, loader: loader}, nil
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}
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// Resources computes and returns the resources from the kustomize config file.
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// The namehashing for configmap/secrets and resolving name reference is only done
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// in the most top overlay once at the end of getting resources.
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func (a *applicationImpl) Resources() (resource.ResourceCollection, error) {
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res, err := a.SemiResources()
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if err != nil {
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return nil, err
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}
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t, err := a.getHashAndReferenceTransformer()
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if err != nil {
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return nil, err
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}
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err = t.Transform(res)
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if err != nil {
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return nil, err
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}
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return res, nil
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}
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// SemiResources computes and returns the resources without name hash and name reference for the app
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func (a *applicationImpl) SemiResources() (resource.ResourceCollection, error) {
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errs := &interror.ManifestErrors{}
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raw, err := a.rawResources()
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if err != nil {
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errs.Append(err)
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}
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cms, err := resource.NewFromConfigMaps(a.loader, a.manifest.ConfigMapGenerator)
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if err != nil {
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errs.Append(err)
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}
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secrets, err := resource.NewFromSecretGenerators(a.loader.Root(), a.manifest.SecretGenerator)
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if err != nil {
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errs.Append(err)
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}
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res, err := resource.Merge(cms, secrets)
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if err != nil {
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return nil, err
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}
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allRes, err := resource.MergeWithOverride(raw, res)
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if err != nil {
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return nil, err
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}
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patches, err := resource.NewFromPatches(a.loader, a.manifest.Patches)
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if err != nil {
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errs.Append(err)
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}
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if len(errs.Get()) > 0 {
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return nil, errs
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}
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t, err := a.getTransformer(patches)
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if err != nil {
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return nil, err
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}
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err = t.Transform(allRes)
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if err != nil {
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return nil, err
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}
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return allRes, nil
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}
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// RawResources computes and returns the raw resources from the kustomize config file.
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// The namehashing for configmap/secrets and resolving name reference is only done
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// in the most top overlay once at the end of getting resources.
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func (a *applicationImpl) RawResources() (resource.ResourceCollection, error) {
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res, err := a.rawResources()
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if err != nil {
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return nil, err
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}
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t, err := a.getHashAndReferenceTransformer()
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if err != nil {
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return nil, err
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}
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err = t.Transform(res)
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if err != nil {
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return nil, err
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}
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return res, nil
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}
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func (a *applicationImpl) rawResources() (resource.ResourceCollection, error) {
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subAppResources, errs := a.subAppResources()
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resources, err := resource.NewFromResources(a.loader, a.manifest.Resources)
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if err != nil {
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errs.Append(err)
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}
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if len(errs.Get()) > 0 {
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return nil, errs
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}
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return resource.Merge(resources, subAppResources)
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}
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func (a *applicationImpl) subAppResources() (resource.ResourceCollection, *interror.ManifestErrors) {
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sliceOfSubAppResources := []resource.ResourceCollection{}
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errs := &interror.ManifestErrors{}
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for _, pkgPath := range a.manifest.Bases {
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subloader, err := a.loader.New(pkgPath)
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if err != nil {
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errs.Append(err)
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continue
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}
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subapp, err := New(subloader)
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if err != nil {
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errs.Append(err)
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continue
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}
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// Gather all transformed resources from subpackages.
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subAppResources, err := subapp.SemiResources()
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if err != nil {
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errs.Append(err)
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continue
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}
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sliceOfSubAppResources = append(sliceOfSubAppResources, subAppResources)
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}
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allResources, err := resource.Merge(sliceOfSubAppResources...)
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if err != nil {
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errs.Append(err)
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}
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return allResources, errs
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}
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// getTransformer generates the following transformers:
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// 1) apply overlay
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// 2) name prefix
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// 3) apply labels
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// 4) apply annotations
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func (a *applicationImpl) getTransformer(patches []*resource.Resource) (transformers.Transformer, error) {
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ts := []transformers.Transformer{}
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ot, err := transformers.NewOverlayTransformer(patches)
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if err != nil {
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return nil, err
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}
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ts = append(ts, ot)
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npt, err := transformers.NewDefaultingNamePrefixTransformer(string(a.manifest.NamePrefix))
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if err != nil {
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return nil, err
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}
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ts = append(ts, npt)
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lt, err := transformers.NewDefaultingLabelsMapTransformer(a.manifest.ObjectLabels)
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if err != nil {
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return nil, err
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}
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ts = append(ts, lt)
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at, err := transformers.NewDefaultingAnnotationsMapTransformer(a.manifest.ObjectAnnotations)
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if err != nil {
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return nil, err
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}
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ts = append(ts, at)
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return transformers.NewMultiTransformer(ts), nil
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}
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// getHashAndReferenceTransformer generates the following transformers:
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// 1) name hash for configmap and secrests
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// 2) apply name reference
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func (a *applicationImpl) getHashAndReferenceTransformer() (transformers.Transformer, error) {
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ts := []transformers.Transformer{}
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nht := transformers.NewNameHashTransformer()
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ts = append(ts, nht)
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nrt, err := transformers.NewDefaultingNameReferenceTransformer()
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if err != nil {
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return nil, err
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}
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ts = append(ts, nrt)
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return transformers.NewMultiTransformer(ts), nil
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}
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func unmarshal(y []byte, o interface{}) error {
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j, err := yaml.YAMLToJSON(y)
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if err != nil {
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return err
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}
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dec := json.NewDecoder(bytes.NewReader(j))
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dec.DisallowUnknownFields()
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return dec.Decode(o)
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}
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