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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "strings" | ||
| "text/template" | ||
|
|
||
| "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" | ||
| ) | ||
|
|
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| // ResolveSelectors uses golang template engine to resolve the expressions in the `selectorExpressions` map using | ||
| // `source` as a data input. Both the keys and values are resolved against the source data. | ||
| // | ||
| // Note: expressions are resolved against the source using lowercase keys | ||
| // | ||
| // Example source: | ||
| // | ||
| // kind: Service | ||
| // metadata: | ||
| // name: MyService | ||
| // | ||
| // Example selectorExpressions: | ||
| // | ||
| // map[string]{string} { | ||
| // "routing.opendatahub.io/{{.kind}}": "{{.metadata.name}}", // > "routing.opendatahub.io/Service": "MyService" | ||
| // } | ||
| func ResolveSelectors(selectorExpressions map[string]string, source *unstructured.Unstructured) (map[string]string, error) { | ||
| resolved := make(map[string]string, len(selectorExpressions)) | ||
| mainTemplate := template.New("unused_name").Option("missingkey=error") | ||
|
|
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| for key, val := range selectorExpressions { | ||
| var err error | ||
|
|
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| resolvedKey := key | ||
| if strings.Contains(key, "{{") { | ||
| resolvedKey, err = resolve(mainTemplate, key, source) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("could not resolve key %s: %w", key, err) | ||
| } | ||
| } | ||
|
|
||
| resolvedVal := val | ||
| if strings.Contains(val, "{{") { | ||
| resolvedVal, err = resolve(mainTemplate, val, source) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("could not resolve value %s: %w", val, err) | ||
| } | ||
| } | ||
|
|
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| resolved[resolvedKey] = resolvedVal | ||
| } | ||
|
|
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| return resolved, nil | ||
| } | ||
|
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| func resolve(templ *template.Template, textTemplate string, source *unstructured.Unstructured) (string, error) { | ||
| tmpl, err := templ.Parse(textTemplate) | ||
| if err != nil { | ||
| return "", fmt.Errorf("could not parse template: %w", err) | ||
| } | ||
|
|
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| var buff bytes.Buffer | ||
|
|
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| if err := tmpl.Execute(&buff, source.Object); err != nil { | ||
| return "", fmt.Errorf("could not execute template: %w", err) | ||
| } | ||
|
|
||
| return buff.String(), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package config_test | ||
|
|
||
| import ( | ||
| . "github.com/onsi/ginkgo/v2" | ||
| . "github.com/onsi/gomega" | ||
| "github.com/opendatahub-io/odh-platform/pkg/config" | ||
| "github.com/opendatahub-io/odh-platform/test" | ||
| "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" | ||
| ) | ||
|
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| var _ = Describe("Templated selectors", test.Unit(), func() { | ||
|
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| Context("simple expressions", func() { | ||
|
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| It("should resolve simple expressions for both key and value", func() { | ||
| labels := map[string]string{ | ||
| "A.{{.kind}}": "{{.metadata.name}}", | ||
| "B": "{{.kind}}", | ||
| } | ||
|
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| target := unstructured.Unstructured{ | ||
| Object: map[string]any{}, | ||
| } | ||
| target.SetName("X") | ||
| target.SetKind("Y") | ||
|
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| renderedLabels, err := config.ResolveSelectors(labels, &target) | ||
| Expect(err).ToNot(HaveOccurred()) | ||
|
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| Expect(renderedLabels["A.Y"]).To(Equal("X")) | ||
| Expect(renderedLabels["B"]).To(Equal("Y")) | ||
| }) | ||
|
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| It("should fail on missing expression", func() { | ||
| labels := map[string]string{ | ||
| "A": "{{.metadata.name}}", | ||
| } | ||
|
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| target := unstructured.Unstructured{ | ||
| Object: map[string]any{}, | ||
| } | ||
| target.SetKind("Y") | ||
|
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| _, err := config.ResolveSelectors(labels, &target) | ||
| Expect(err).To(HaveOccurred()) | ||
| Expect(err.Error()).To(ContainSubstring("could not execute template")) | ||
| Expect(err.Error()).To(ContainSubstring("could not resolve value")) | ||
| }) | ||
| }) | ||
|
|
||
| }) |
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