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Add a slim sprig package to avoid additional dependencies and move the common logic to util package
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| /* | ||
| Copyright 2025 The Kubernetes Authors. | ||
| 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 util | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "text/template" | ||
|
|
||
| sprig "github.com/go-task/slim-sprig/v3" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| const ( | ||
| maxNameLength = 63 | ||
| ) | ||
|
|
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| var nameTemplateFuncs = map[string]any{ | ||
| "trimSuffix": sprig.GenericFuncMap()["trimSuffix"], | ||
| "trunc": sprig.GenericFuncMap()["trunc"], | ||
| } | ||
|
|
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| var nameTpl = template.New("name generator").Funcs(nameTemplateFuncs).Option("missingkey=error") | ||
|
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| // GenerateNameFromMachineNameTemplate generate a name from machine name and a naming strategy template. | ||
| // the template supports only `trimSuffix` and `trunc` functions. | ||
| func GenerateNameFromMachineNameTemplate(machineName string, nameTemplate *string) (string, error) { | ||
| if machineName == "" { | ||
| return "", fmt.Errorf("machine name can not be emmpty") | ||
| } | ||
|
|
||
| if nameTemplate == nil { | ||
| return machineName, nil | ||
| } | ||
|
|
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| data := map[string]interface{}{ | ||
| "machine": map[string]interface{}{ | ||
| "name": machineName, | ||
| }, | ||
| } | ||
|
|
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| tpl, err := nameTpl.Parse(*nameTemplate) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "failed to generate name: failed to parse template %q", *nameTemplate) | ||
| } | ||
|
|
||
| var buf bytes.Buffer | ||
| if err := tpl.Execute(&buf, data); err != nil { | ||
| return "", errors.Wrap(err, "failed to generate name") | ||
| } | ||
|
|
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| name := buf.String() | ||
|
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| // If the name exceeds the maxNameLength, trim to maxNameLength. | ||
| // Note: we're not adding a random suffix as the name has to be deterministic. | ||
| if len(name) > maxNameLength { | ||
| name = name[:maxNameLength] | ||
| } | ||
|
|
||
| return name, nil | ||
| } |
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