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/*
* Copyright 2018 Intel Corporation, Inc
* Copyright © 2021 Samsung Electronics
*
* 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 helm
import (
"fmt"
"github.com/onap/multicloud-k8s/src/k8splugin/internal/utils"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strings"
pkgerrors "github.com/pkg/errors"
"helm.sh/helm/v3/pkg/action"
"helm.sh/helm/v3/pkg/chart/loader"
"helm.sh/helm/v3/pkg/cli"
helmOptions "helm.sh/helm/v3/pkg/cli/values"
"helm.sh/helm/v3/pkg/getter"
"helm.sh/helm/v3/pkg/releaseutil"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/apimachinery/pkg/util/validation"
k8syaml "k8s.io/apimachinery/pkg/util/yaml"
)
// Template is the interface for all helm templating commands
// Any backend implementation will implement this interface and will
// access the functionality via this.
// FIXME Template is not referenced anywhere
type Template interface {
GenerateKubernetesArtifacts(
chartPath string,
valueFiles []string,
values []string) ([]KubernetesResourceTemplate, []*Hook, error)
}
// TemplateClient implements the Template interface
// It will also be used to maintain any localized state
type TemplateClient struct {
emptyRegex *regexp.Regexp
kubeVersion string
kubeNameSpace string
releaseName string
}
// NewTemplateClient returns a new instance of TemplateClient
func NewTemplateClient(k8sversion, namespace, releasename string) *TemplateClient {
return &TemplateClient{
// emptyRegex defines template content that could be considered empty yaml-wise
emptyRegex: regexp.MustCompile(`(?m)\A(^(\s*#.*|\s*)$\n?)*\z`),
// defaultKubeVersion is the default value of --kube-version flag
kubeVersion: k8sversion,
kubeNameSpace: namespace,
releaseName: releasename,
}
}
// Combines valueFiles and values into a single values stream.
// values takes precedence over valueFiles
func (h *TemplateClient) processValues(valueFiles []string, values []string) (map[string]interface{}, error) {
settings := cli.New()
providers := getter.All(settings)
options := helmOptions.Options{
ValueFiles: valueFiles,
Values: values,
}
base, err := options.MergeValues(providers)
if err != nil {
return nil, err
}
return base, nil
}
// GenerateKubernetesArtifacts a mapping of type to fully evaluated helm template
func (h *TemplateClient) GenerateKubernetesArtifacts(inputPath string, valueFiles []string,
values []string) ([]KubernetesResourceTemplate, []*Hook, error) {
var outputDir, chartPath, namespace, releaseName string
var retData []KubernetesResourceTemplate
var hookList []*Hook
releaseName = h.releaseName
namespace = h.kubeNameSpace
// verify chart path exists
if _, err := os.Stat(inputPath); err == nil {
if chartPath, err = filepath.Abs(inputPath); err != nil {
return retData, hookList, err
}
} else {
return retData, hookList, err
}
//Create a temp directory in the system temp folder
outputDir, err := ioutil.TempDir("", "helm-tmpl-")
if err != nil {
return retData, hookList, pkgerrors.Wrap(err, "Got error creating temp dir")
}
if namespace == "" {
namespace = "default"
}
// get combined values and create config
rawVals, err := h.processValues(valueFiles, values)
if err != nil {
return retData, hookList, err
}
if msgs := validation.IsDNS1123Label(releaseName); releaseName != "" && len(msgs) > 0 {
return retData, hookList, fmt.Errorf("release name %s is not a valid DNS label: %s", releaseName, strings.Join(msgs, ";"))
}
// Initialize the install client
client := action.NewInstall(&action.Configuration{})
client.DryRun = true
client.ClientOnly = true
client.ReleaseName = releaseName
client.IncludeCRDs = true
client.DisableHooks = true //to ensure no duplicates in case of defined pre/post install hooks
// Check chart dependencies to make sure all are present in /charts
chartRequested, err := loader.Load(chartPath)
if err != nil {
return retData, hookList, err
}
if chartRequested.Metadata.Type != "" && chartRequested.Metadata.Type != "application" {
return retData, hookList, fmt.Errorf(
"chart %q has an unsupported type and is not installable: %q",
chartRequested.Metadata.Name,
chartRequested.Metadata.Type,
)
}
client.Namespace = namespace
release, err := client.Run(chartRequested, rawVals)
if err != nil {
return retData, hookList, err
}
// SplitManifests returns integer-sortable so that manifests get output
// in the same order as the input by `BySplitManifestsOrder`.
rmap := releaseutil.SplitManifests(release.Manifest)
// We won't get any meaningful hooks from here
_, m, err := releaseutil.SortManifests(rmap, nil, releaseutil.InstallOrder)
if err != nil {
return retData, hookList, err
}
for _, k := range m {
data := k.Content
b := filepath.Base(k.Name)
if b == "NOTES.txt" {
continue
}
if strings.HasPrefix(b, "_") {
continue
}
// blank template after execution
if h.emptyRegex.MatchString(data) {
continue
}
mfilePath := filepath.Join(outputDir, k.Name)
utils.EnsureDirectory(mfilePath)
err = ioutil.WriteFile(mfilePath, []byte(k.Content), 0600)
if err != nil {
return retData, hookList, err
}
gvk, err := getGroupVersionKind(data)
if err != nil {
return retData, hookList, err
}
kres := KubernetesResourceTemplate{
GVK: gvk,
FilePath: mfilePath,
}
retData = append(retData, kres)
}
for _, h := range release.Hooks {
hFilePath := filepath.Join(outputDir, h.Name)
utils.EnsureDirectory(hFilePath)
err = ioutil.WriteFile(hFilePath, []byte(h.Manifest), 0600)
if err != nil {
return retData, hookList, err
}
gvk, err := getGroupVersionKind(h.Manifest)
if err != nil {
return retData, hookList, err
}
hookList = append(hookList, &Hook{*h, KubernetesResourceTemplate{gvk, hFilePath}})
}
return retData, hookList, nil
}
func getGroupVersionKind(data string) (schema.GroupVersionKind, error) {
out, err := k8syaml.ToJSON([]byte(data))
if err != nil {
return schema.GroupVersionKind{}, pkgerrors.Wrap(err, "Converting yaml to json:\n"+data)
}
simpleMeta := json.SimpleMetaFactory{}
gvk, err := simpleMeta.Interpret(out)
if err != nil {
return schema.GroupVersionKind{}, pkgerrors.Wrap(err, "Parsing apiversion and kind")
}
return *gvk, nil
}
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