feat: helpers methods to test chart templates rendering (#18)

internal/workflows/steps/chart.go

@@ -128,7 +128,7 @@ func (r *chartStepHandler) valuesOptions(id string, res []*v1alpha1.Data) (opts
 			}
 
 			r.logr.Debug(fmt.Sprintf(
-				"DBG [chart:%s]: set (name: %s, value: %s)",
+				"[chart:%s]: set (name: %s, value: %s)",
 				id, el.Name, ellipsis(strval(val), 20)))
 		}
 	}

internal/workflows/steps/chart_test.go

@@ -0,0 +1,110 @@
+//go:build integration
+// +build integration
+
+package steps
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/krateoplatformops/installer/apis/workflows/v1alpha1"
+	"github.com/krateoplatformops/installer/internal/cache"
+	"github.com/krateoplatformops/installer/internal/helmclient"
+	"github.com/krateoplatformops/installer/internal/ptr"
+	"github.com/krateoplatformops/provider-runtime/pkg/logging"
+	"helm.sh/helm/v3/pkg/action"
+	pkgcli "helm.sh/helm/v3/pkg/cli"
+	"helm.sh/helm/v3/pkg/getter"
+)
+
+func TestChartTemplate(t *testing.T) {
+	const (
+		ns        = "demo-system"
+		chartPath = "../../../testdata/chart-unit-test"
+	)
+
+	data := []*v1alpha1.Data{
+		{
+			Name:     "sftp.allowedMACs",
+			Value:    "null",
+			AsString: ptr.To(true),
+		},
+		{
+			Name:  "env.KRATEO_GATEWAY_DNS_NAMES",
+			Value: "{krateo-gateway.sticz.svc,$KRATEO_GATEWAY_INGRESS_HOST}",
+		},
+	}
+
+	env := cache.New[string, string]()
+	env.Set("KRATEO_GATEWAY_INGRESS_HOST", "http://sti.cz")
+
+	hdl, err := chartStepHandlerForNamespace(ns, env)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	opts := hdl.valuesOptions("test", data)
+
+	yml, err := renderChart(&helmclient.ChartSpec{
+		Namespace:     ns,
+		ValuesOptions: opts,
+	}, ns, chartPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fmt.Println(yml)
+}
+
+func chartStepHandlerForNamespace(ns string, env *cache.Cache[string, string]) (*chartStepHandler, error) {
+	rc, err := newRestConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	cli, err := helmClientForNamespace(rc, ns)
+	if err != nil {
+		return nil, err
+	}
+
+	logr := logging.NewLogrLogger(newStdoutLogger())
+
+	return &chartStepHandler{
+		cli: cli, env: env,
+		subst: func(k string) string {
+			if v, ok := env.Get(k); ok {
+				return v
+			}
+
+			return "$" + k
+		},
+		logr: logr,
+	}, nil
+}
+
+func renderChart(spec *helmclient.ChartSpec, ns, chartPath string) (string, error) {
+	p := getter.All(pkgcli.New())
+	values, err := spec.GetValuesMap(p)
+	if err != nil {
+		return "", err
+	}
+
+	chart, err := loadChart(os.DirFS(chartPath))
+	if err != nil {
+		return "", err
+	}
+
+	client := action.NewInstall(&action.Configuration{})
+	client.ClientOnly = true
+	client.DryRun = true
+	client.ReleaseName = "test"
+	client.IncludeCRDs = true
+	client.Namespace = ns
+
+	rel, err := client.Run(chart, values)
+	if err != nil {
+		return "", fmt.Errorf("could not render helm chart correctly: %w", err)
+	}
+	return rel.Manifest, nil
+}

internal/workflows/steps/support_test.go

@@ -6,6 +6,7 @@ package steps
 import (
 	"fmt"
 	"io"
+	"io/fs"
 	"log"
 	"os"
 	"path/filepath"
@@ -15,6 +16,8 @@ import (
 	"github.com/go-logr/logr/funcr"
 	"github.com/krateoplatformops/installer/internal/helmclient"
 	"github.com/krateoplatformops/provider-runtime/pkg/logging"
+	"helm.sh/helm/v3/pkg/chart"
+	"helm.sh/helm/v3/pkg/chart/loader"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
 )
@@ -86,3 +89,34 @@ func newStdoutLogger() logr.Logger {
 		}
 	}, funcr.Options{})
 }
+
+func loadChart(f fs.FS) (*chart.Chart, error) {
+	files := []*loader.BufferedFile{}
+
+	err := fs.WalkDir(f, ".", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if d.IsDir() {
+			return nil
+		}
+
+		data, err := fs.ReadFile(f, path)
+		if err != nil {
+			return fmt.Errorf("could not read manifest %s: %w", path, err)
+		}
+
+		files = append(files, &loader.BufferedFile{
+			Name: path,
+			Data: data,
+		})
+
+		return nil
+	})
+	if err != nil {
+		return nil, fmt.Errorf("could not walk chart directory: %w", err)
+	}
+
+	return loader.LoadFiles(files)
+}

testdata/chart-unit-test/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v2
+name: some-chart
+version: 1.0.0
+appVersion: 1.0.0

testdata/chart-unit-test/templates/configmap.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ printf "%s-%s" .Chart.Name .Release.Name | trunc 63 | trimSuffix "-" }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- with .Values.labels -}}
+    {{ toYaml . | nindent 4 }}
+    {{- end }}
+data:
+  allowedMACs: {{ .Values.sftp.allowedMACs }}
+  KRATEO_GATEWAY_DNS_NAMES: {{ .Values.env.KRATEO_GATEWAY_DNS_NAMES }}
+  something: something

testdata/chart-unit-test/templates/secret.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ printf "%s-%s" .Chart.Name .Release.Name | trunc 63 | trimSuffix "-" }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- with .Values.labels -}}
+    {{ toYaml . | nindent 4 }}
+    {{- end }}
+stringData:
+  something-secret: shhhhh

testdata/chart-unit-test/values.yaml

@@ -0,0 +1,8 @@
+labels:
+  some: default
+
+sftp:
+  allowedMAC: xxx
+
+env:
+  KRATEO_GATEWAY_DNS_NAMES: yyy