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manifests.go
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manifests.go
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package manifests
import (
"bytes"
"embed"
_ "embed"
"fmt"
"io/fs"
"path/filepath"
"text/template"
)
const (
wegoManifestsDir = "wego-app"
)
var (
//go:embed crds/wego.weave.works_apps.yaml
AppCRD []byte
//go:embed wego-app/*
wegoAppTemplates embed.FS
)
type WegoAppParams struct {
Version string
Namespace string
}
// GenerateWegoManifests generates wego-app manifests from a template
func GenerateWegoAppManifests(params WegoAppParams) ([][]byte, error) {
manifests := [][]byte{}
templates, err := fs.ReadDir(wegoAppTemplates, wegoManifestsDir)
if err != nil {
return nil, fmt.Errorf("failed reading templates directory: %w", err)
}
for _, template := range templates {
tplName := template.Name()
data, err := fs.ReadFile(wegoAppTemplates, filepath.Join(wegoManifestsDir, tplName))
if err != nil {
return nil, fmt.Errorf("failed reading template %s: %w", tplName, err)
}
manifest, err := executeTemplate(tplName, string(data), params)
if err != nil {
return nil, fmt.Errorf("failed executing template: %s: %w", tplName, err)
}
manifests = append(manifests, manifest)
}
return manifests, nil
}
func executeTemplate(name string, tplData string, params WegoAppParams) ([]byte, error) {
template, err := template.New(name).Parse(tplData)
if err != nil {
return nil, fmt.Errorf("error parsing template %s: %w", name, err)
}
yaml := &bytes.Buffer{}
err = template.Execute(yaml, params)
if err != nil {
return nil, fmt.Errorf("error injecting values to template: %w", err)
}
return yaml.Bytes(), nil
}