New static configuration loading system.

Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com>

pkg/config/parser/parser.go

@@ -0,0 +1,38 @@
+// Package parser implements decoding and encoding between a flat map of labels and a typed Configuration.
+package parser
+
+// Decode decodes the given map of labels into the given element.
+// If any filters are present, labels which do not match the filters are skipped.
+// The operation goes through three stages roughly summarized as:
+// labels -> tree of untyped nodes
+// untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
+// "typed" nodes -> typed element
+func Decode(labels map[string]string, element interface{}, filters ...string) error {
+	node, err := DecodeToNode(labels, filters...)
+	if err != nil {
+		return err
+	}
+
+	err = AddMetadata(element, node)
+	if err != nil {
+		return err
+	}
+
+	err = Fill(element, node)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Encode converts an element to labels.
+// element -> node (value) -> label (node)
+func Encode(element interface{}) (map[string]string, error) {
+	node, err := EncodeToNode(element, true)
+	if err != nil {
+		return nil, err
+	}
+
+	return EncodeNode(node), nil
+}