Initial v1.0.0 commit

pkg/apis/config/loader/loader.go

@@ -0,0 +1,58 @@
+package loader
+
+import (
+	"io/ioutil"
+
+	"github.com/javamachr/gardener-extension-shoot-fleet-agent/pkg/apis/config"
+	"github.com/javamachr/gardener-extension-shoot-fleet-agent/pkg/apis/config/install"
+
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/runtime/serializer/json"
+	"k8s.io/apimachinery/pkg/runtime/serializer/versioning"
+)
+
+var (
+	Codec  runtime.Codec
+	Scheme *runtime.Scheme
+)
+
+func init() {
+	Scheme = runtime.NewScheme()
+	install.Install(Scheme)
+	yamlSerializer := json.NewYAMLSerializer(json.DefaultMetaFactory, Scheme, Scheme)
+	Codec = versioning.NewDefaultingCodecForScheme(
+		Scheme,
+		yamlSerializer,
+		yamlSerializer,
+		schema.GroupVersion{Version: "v1alpha1"},
+		runtime.InternalGroupVersioner,
+	)
+}
+
+// LoadFromFile takes a filename and de-serializes the contents into FleetAgentConfig object.
+func LoadFromFile(filename string) (*config.FleetAgentConfig, error) {
+	bytes, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	return Load(bytes)
+}
+
+// Load takes a byte slice and de-serializes the contents into FleetAgentConfig object.
+// Encapsulates de-serialization without assuming the source is a file.
+func Load(data []byte) (*config.FleetAgentConfig, error) {
+	cfg := &config.FleetAgentConfig{}
+
+	if len(data) == 0 {
+		return cfg, nil
+	}
+
+	decoded, _, err := Codec.Decode(data, &schema.GroupVersionKind{Version: "v1alpha1", Kind: "Config"}, cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	return decoded.(*config.FleetAgentConfig), nil
+}