/
parse.go
73 lines (65 loc) · 1.84 KB
/
parse.go
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package flavours
import (
"fmt"
"io/fs"
"os"
"sort"
processor "sigs.k8s.io/cluster-api/cmd/clusterctl/client/yamlprocessor"
"sigs.k8s.io/yaml"
corev1 "k8s.io/api/core/v1"
)
func ParseFile(fname string) (*CAPITemplate, error) {
b, err := os.ReadFile(fname)
if err != nil {
return nil, fmt.Errorf("failed to read template: %w", err)
}
return ParseBytes(b, fname)
}
func ParseFileFromFS(fsys fs.FS, fname string) (*CAPITemplate, error) {
b, err := fs.ReadFile(fsys, fname)
if err != nil {
return nil, fmt.Errorf("failed to read template: %w", err)
}
return ParseBytes(b, fname)
}
func ParseBytes(b []byte, name string) (*CAPITemplate, error) {
var t CAPITemplate
err := yaml.Unmarshal(b, &t)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal %s: %w", name, err)
}
return &t, nil
}
// ParseConfigMap parses a ConfigMap and returns a map of CAPITemplates indexed by their name.
// The name of the template is set to the key of the ConfigMap.Data map.
func ParseConfigMap(cm corev1.ConfigMap) (map[string]*CAPITemplate, error) {
tm := map[string]*CAPITemplate{}
for k, v := range(cm.Data) {
t, err := ParseBytes([]byte(v), k)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal template %s from configmap %s, err: %w", k, cm.ObjectMeta.Name, err)
}
tm[k] = t
}
return tm, nil
}
// Params extracts the named parameters from resource templates in a spec.
func Params(s CAPITemplateSpec) ([]string, error) {
proc := processor.NewSimpleProcessor()
variables := map[string]bool{}
for _, v := range s.ResourceTemplates {
tv, err := proc.GetVariables(v.RawExtension.Raw)
if err != nil {
return nil, fmt.Errorf("processing template: %w", err)
}
for _, n := range tv {
variables[n] = true
}
}
var names []string
for k := range variables {
names = append(names, k)
}
sort.Strings(names)
return names, nil
}