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-rw-r--r--src/k8splugin/internal/helm/helm.go259
1 files changed, 259 insertions, 0 deletions
diff --git a/src/k8splugin/internal/helm/helm.go b/src/k8splugin/internal/helm/helm.go
new file mode 100644
index 00000000..65a36d6b
--- /dev/null
+++ b/src/k8splugin/internal/helm/helm.go
@@ -0,0 +1,259 @@
+/*
+ * Copyright 2018 Intel Corporation, Inc
+ *
+ * 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"
+ "io/ioutil"
+ "k8s.io/helm/pkg/strvals"
+ "os"
+ "path"
+ "path/filepath"
+ "regexp"
+ "strings"
+
+ "github.com/ghodss/yaml"
+ pkgerrors "github.com/pkg/errors"
+
+ "k8s.io/apimachinery/pkg/util/validation"
+ "k8s.io/helm/pkg/chartutil"
+ "k8s.io/helm/pkg/manifest"
+ "k8s.io/helm/pkg/proto/hapi/chart"
+ "k8s.io/helm/pkg/releaseutil"
+ "k8s.io/helm/pkg/renderutil"
+ "k8s.io/helm/pkg/tiller"
+ "k8s.io/helm/pkg/timeconv"
+)
+
+// Template is the interface for all helm templating commands
+// Any backend implementation will implement this interface and will
+// access the functionality via this.
+type Template interface {
+ GenerateKubernetesArtifacts(
+ chartPath string,
+ valueFiles []string,
+ values []string) (map[string][]string, error)
+}
+
+// TemplateClient implements the Template interface
+// It will also be used to maintain any localized state
+type TemplateClient struct {
+ whitespaceRegex *regexp.Regexp
+ kubeVersion string
+ kubeNameSpace string
+ releaseName string
+}
+
+// NewTemplateClient returns a new instance of TemplateClient
+func NewTemplateClient(k8sversion, namespace, releasename string) *TemplateClient {
+ return &TemplateClient{
+ whitespaceRegex: regexp.MustCompile(`^\s*$`),
+ // 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) ([]byte, error) {
+ base := map[string]interface{}{}
+
+ //Values files that are used for overriding the chart
+ for _, filePath := range valueFiles {
+ currentMap := map[string]interface{}{}
+
+ var bytes []byte
+ var err error
+ if strings.TrimSpace(filePath) == "-" {
+ bytes, err = ioutil.ReadAll(os.Stdin)
+ } else {
+ bytes, err = ioutil.ReadFile(filePath)
+ }
+
+ if err != nil {
+ return []byte{}, err
+ }
+
+ if err := yaml.Unmarshal(bytes, &currentMap); err != nil {
+ return []byte{}, fmt.Errorf("failed to parse %s: %s", filePath, err)
+ }
+ // Merge with the previous map
+ base = h.mergeValues(base, currentMap)
+ }
+
+ //User specified value. Similar to ones provided by -x
+ for _, value := range values {
+ if err := strvals.ParseInto(value, base); err != nil {
+ return []byte{}, fmt.Errorf("failed parsing --set data: %s", err)
+ }
+ }
+
+ return yaml.Marshal(base)
+}
+
+func (h *TemplateClient) mergeValues(dest map[string]interface{}, src map[string]interface{}) map[string]interface{} {
+ for k, v := range src {
+ // If the key doesn't exist already, then just set the key to that value
+ if _, exists := dest[k]; !exists {
+ dest[k] = v
+ continue
+ }
+ nextMap, ok := v.(map[string]interface{})
+ // If it isn't another map, overwrite the value
+ if !ok {
+ dest[k] = v
+ continue
+ }
+ // Edge case: If the key exists in the destination, but isn't a map
+ destMap, isMap := dest[k].(map[string]interface{})
+ // If the source map has a map for this key, prefer it
+ if !isMap {
+ dest[k] = v
+ continue
+ }
+ // If we got to this point, it is a map in both, so merge them
+ dest[k] = h.mergeValues(destMap, nextMap)
+ }
+ return dest
+}
+
+func (h *TemplateClient) ensureDirectory(f string) error {
+ base := path.Dir(f)
+ _, err := os.Stat(base)
+ if err != nil && !os.IsNotExist(err) {
+ return err
+ }
+ return os.MkdirAll(base, 0755)
+}
+
+// GenerateKubernetesArtifacts a mapping of type to fully evaluated helm template
+func (h *TemplateClient) GenerateKubernetesArtifacts(inputPath string, valueFiles []string, values []string) (map[string][]string, error) {
+
+ var outputDir, chartPath, namespace, releaseName string
+ var retData map[string][]string
+
+ 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, err
+ }
+ } else {
+ return retData, err
+ }
+
+ //Create a temp directory in the system temp folder
+ outputDir, err := ioutil.TempDir("", "helm-tmpl-")
+ if err != nil {
+ return retData, 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, err
+ }
+ config := &chart.Config{Raw: string(rawVals), Values: map[string]*chart.Value{}}
+
+ if msgs := validation.IsDNS1123Label(releaseName); releaseName != "" && len(msgs) > 0 {
+ return retData, fmt.Errorf("release name %s is not a valid DNS label: %s", releaseName, strings.Join(msgs, ";"))
+ }
+
+ // Check chart requirements to make sure all dependencies are present in /charts
+ c, err := chartutil.Load(chartPath)
+ if err != nil {
+ return retData, pkgerrors.Errorf("Got error: %s", err.Error())
+ }
+
+ renderOpts := renderutil.Options{
+ ReleaseOptions: chartutil.ReleaseOptions{
+ Name: releaseName,
+ IsInstall: true,
+ IsUpgrade: false,
+ Time: timeconv.Now(),
+ Namespace: namespace,
+ },
+ KubeVersion: h.kubeVersion,
+ }
+
+ renderedTemplates, err := renderutil.Render(c, config, renderOpts)
+ if err != nil {
+ return retData, err
+ }
+
+ newRenderedTemplates := make(map[string]string)
+
+ //Some manifests can contain multiple yaml documents
+ //This step is splitting them up into multiple files
+ //Each file contains only a single k8s kind
+ for k, v := range renderedTemplates {
+ //Splits into manifest-0, manifest-1 etc
+ if filepath.Base(k) == "NOTES.txt" {
+ continue
+ }
+ rmap := releaseutil.SplitManifests(v)
+ count := 0
+ for _, v1 := range rmap {
+ key := fmt.Sprintf("%s-%d", k, count)
+ newRenderedTemplates[key] = v1
+ count = count + 1
+ }
+ }
+
+ listManifests := manifest.SplitManifests(newRenderedTemplates)
+ var manifestsToRender []manifest.Manifest
+ //render all manifests in the chart
+ manifestsToRender = listManifests
+ retData = make(map[string][]string)
+ for _, m := range tiller.SortByKind(manifestsToRender) {
+ data := m.Content
+ b := filepath.Base(m.Name)
+ if b == "NOTES.txt" {
+ continue
+ }
+ if strings.HasPrefix(b, "_") {
+ continue
+ }
+
+ // blank template after execution
+ if h.whitespaceRegex.MatchString(data) {
+ continue
+ }
+
+ mfilePath := filepath.Join(outputDir, m.Name)
+ h.ensureDirectory(mfilePath)
+ err = ioutil.WriteFile(mfilePath, []byte(data), 0666)
+ if err != nil {
+ return retData, err
+ }
+
+ if val, ok := retData[m.Head.Kind]; ok {
+ retData[m.Head.Kind] = append(val, mfilePath)
+ } else {
+ retData[m.Head.Kind] = []string{mfilePath}
+ }
+ }
+ return retData, nil
+}