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feat(templates): process Feature templates in memory (opendatahub-io#797
) Co-authored-by: Bartosz Majsak <bartosz.majsak@gmail.com> Co-authored-by: Wen Zhou <wenzhou@redhat.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,74 +1,104 @@ | ||
| package feature | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "embed" | ||
| "fmt" | ||
| "html/template" | ||
| "os" | ||
| "io" | ||
| "io/fs" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| const BaseOutputDir = "/tmp/odh-operator" | ||
| //go:embed templates | ||
| var embeddedFiles embed.FS | ||
|
|
||
| type manifest struct { | ||
| name, | ||
| path string | ||
| path, | ||
| processedContent string | ||
| template, | ||
| patch, | ||
| processed bool | ||
| patch bool | ||
| fsys fs.FS | ||
| } | ||
|
|
||
| func loadManifestsFrom(path string) ([]manifest, error) { | ||
| func loadManifestsFrom(fsys fs.FS, path string) ([]manifest, error) { | ||
| var manifests []manifest | ||
| if err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error { | ||
|
|
||
| err := fs.WalkDir(fsys, path, func(path string, dirEntry fs.DirEntry, walkErr error) error { | ||
| _, err := dirEntry.Info() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if info.IsDir() { | ||
|
|
||
| if dirEntry.IsDir() { | ||
| return nil | ||
| } | ||
| basePath := filepath.Base(path) | ||
| manifests = append(manifests, manifest{ | ||
| name: basePath, | ||
| path: path, | ||
| patch: strings.Contains(basePath, ".patch"), | ||
| template: filepath.Ext(path) == ".tmpl", | ||
| }) | ||
| m := createManifestFrom(fsys, path) | ||
| manifests = append(manifests, m) | ||
|
|
||
| return nil | ||
| }); err != nil { | ||
| return nil, errors.WithStack(err) | ||
| }) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return manifests, nil | ||
| } | ||
|
|
||
| func createManifestFrom(fsys fs.FS, path string) manifest { | ||
| basePath := filepath.Base(path) | ||
| m := manifest{ | ||
| name: basePath, | ||
| path: path, | ||
| patch: strings.Contains(basePath, ".patch"), | ||
| template: filepath.Ext(path) == ".tmpl", | ||
| fsys: fsys, | ||
| } | ||
|
|
||
| return m | ||
| } | ||
|
|
||
| func (m *manifest) targetPath() string { | ||
| return fmt.Sprintf("%s%s", m.path[:len(m.path)-len(filepath.Ext(m.path))], ".yaml") | ||
| } | ||
|
|
||
| func (m *manifest) processTemplate(data interface{}) error { | ||
| if !m.template { | ||
| return nil | ||
| func (m *manifest) process(data interface{}) error { | ||
| manifestFile, err := m.open() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| path := m.targetPath() | ||
| defer manifestFile.Close() | ||
|
|
||
| f, err := os.Create(path) | ||
| content, err := io.ReadAll(manifestFile) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to create file: %w", err) | ||
| } | ||
|
|
||
| tmpl := template.New(m.name).Funcs(template.FuncMap{"ReplaceChar": ReplaceChar}) | ||
| if !m.template { | ||
| // If, by convention, the file is not suffixed with `.tmpl` we do not need to trigger template processing. | ||
| // It's safe to return at this point. | ||
| m.processedContent = string(content) | ||
| return nil | ||
| } | ||
|
|
||
| tmpl, err = tmpl.ParseFiles(m.path) | ||
| tmpl, err := template.New(m.name).Funcs(template.FuncMap{"ReplaceChar": ReplaceChar}).Parse(string(content)) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to create file: %w", err) | ||
| } | ||
|
|
||
| var buffer bytes.Buffer | ||
| if err := tmpl.Execute(&buffer, data); err != nil { | ||
| return err | ||
| } | ||
|
|
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| err = tmpl.Execute(f, data) | ||
| m.processed = err == nil | ||
| m.processedContent = buffer.String() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| return err | ||
| func (m *manifest) open() (fs.File, error) { | ||
| return m.fsys.Open(m.path) | ||
| } |
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