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Co-authored-by: Shiming Zhang <wzshiming@foxmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /* | ||
| Copyright 2022 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 controllers | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "fmt" | ||
| "strings" | ||
| "sync" | ||
| "text/template" | ||
|
|
||
| "sigs.k8s.io/yaml" | ||
| ) | ||
|
|
||
| type renderer struct { | ||
| cache sync.Map | ||
| bufferPool sync.Pool | ||
| funcMap template.FuncMap | ||
| } | ||
|
|
||
| func newRenderer(funcMap template.FuncMap) *renderer { | ||
| return &renderer{ | ||
| funcMap: funcMap, | ||
| cache: sync.Map{}, | ||
| bufferPool: sync.Pool{ | ||
| New: func() interface{} { | ||
| return bytes.NewBuffer(make([]byte, 4*1024)) | ||
| }, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // renderToJson renders the template with the given text and original object. | ||
| func (r *renderer) renderToJson(text string, original interface{}) ([]byte, error) { | ||
| text = strings.TrimSpace(text) | ||
| v, ok := r.cache.Load(text) | ||
| if !ok { | ||
| temp, err := template.New("_").Funcs(r.funcMap).Parse(text) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| r.cache.Store(text, temp) | ||
| v = temp | ||
| } | ||
| temp := v.(*template.Template) | ||
| buf := r.bufferPool.Get().(*bytes.Buffer) | ||
| defer r.bufferPool.Put(buf) | ||
|
|
||
| buf.Reset() | ||
| err := json.NewEncoder(buf).Encode(original) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var data interface{} | ||
| decoder := json.NewDecoder(buf) | ||
| decoder.UseNumber() | ||
| err = decoder.Decode(&data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| buf.Reset() | ||
| err = temp.Execute(buf, data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| out, err := yaml.YAMLToJSON(buf.Bytes()) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("%w: %s", err, buf.String()) | ||
| } | ||
| return out, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| Copyright 2022 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 controllers | ||
|
|
||
| import ( | ||
| "html/template" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestRenderToJson(t *testing.T) { | ||
|
|
||
| testCases := []struct { | ||
| name string | ||
| funcMap template.FuncMap | ||
| templText string | ||
| original interface{} | ||
| expected string | ||
| }{ | ||
| { | ||
| name: "basic", | ||
| funcMap: template.FuncMap{}, | ||
| original: map[string]interface{}{"k": "v1"}, | ||
| templText: `{"k":{{ .k }}}`, | ||
| expected: `{"k":"v1"}`, | ||
| }, | ||
| { | ||
| name: "basic with yaml format", | ||
| funcMap: template.FuncMap{}, | ||
| original: map[string]interface{}{"k": "v1"}, | ||
| templText: `k: {{ .k }}`, | ||
| expected: `{"k":"v1"}`, | ||
| }, | ||
| { | ||
| name: "with funcMap", | ||
| funcMap: template.FuncMap{ | ||
| "Foo": func() string { | ||
| return "foo" | ||
| }, | ||
| }, | ||
| original: map[string]interface{}{"k": "v1"}, | ||
| templText: `{"foo":{{ Foo }},"k":{{ .k }}}`, | ||
| expected: `{"foo":"foo","k":"v1"}`, | ||
| }, | ||
| { | ||
| name: "with whitespace", | ||
| funcMap: template.FuncMap{ | ||
| "Foo": func() string { | ||
| return "foo" | ||
| }, | ||
| }, | ||
| original: map[string]interface{}{"k": "v1"}, | ||
| templText: ` {"foo":{{ Foo }},"k":{{ .k }}} `, | ||
| expected: `{"foo":"foo","k":"v1"}`, | ||
| }, | ||
| } | ||
| for _, tc := range testCases { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| r := newRenderer(tc.funcMap) | ||
| actual, err := r.renderToJson(tc.templText, tc.original) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if string(actual) != tc.expected { | ||
| t.Fatalf("expected %s, got %s", tc.expected, actual) | ||
| } | ||
| }) | ||
| } | ||
| } |
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