From 1c6919bdc2cbca37b471ad4389c99b9e1e26d87b Mon Sep 17 00:00:00 2001
From: Stefan Gula <steweg@gmail.com>
Date: Mon, 4 Mar 2024 15:16:44 +0100
Subject: [PATCH] data: fixing broken DLeaf value and print_dict API

This patch fixes broken APIs, which were using no longer valid structs and
performing validation step instead of just checking the realtype of data

Signed-off-by: Stefan Gula <steweg@gmail.com>
---
 cffi/cdefs.h       |  6 ++++-
 libyang/data.py    | 57 +++++++++++++++++++++++-----------------------
 tests/test_data.py |  1 +
 3 files changed, 34 insertions(+), 30 deletions(-)

diff --git a/cffi/cdefs.h b/cffi/cdefs.h
index 8165a70..3fd8e7b 100644
--- a/cffi/cdefs.h
+++ b/cffi/cdefs.h
@@ -900,9 +900,13 @@ struct lyd_value {
     ...;
 };
 
+struct lyd_value_union {
+    struct lyd_value value;
+    ...;
+};
+
 const char * lyd_get_value(const struct lyd_node *);
 struct lyd_node* lyd_child(const struct lyd_node *);
-LY_ERR lyd_value_validate(const struct ly_ctx *, const struct lysc_node *, const char *, size_t, const struct lyd_node *, const struct lysc_type **, const char **);
 LY_ERR lyd_find_path(const struct lyd_node *, const char *, ly_bool, struct lyd_node **);
 void lyd_free_siblings(struct lyd_node *);
 struct lyd_node* lyd_first_sibling(const struct lyd_node *);
diff --git a/libyang/data.py b/libyang/data.py
index 288303d..07281f0 100644
--- a/libyang/data.py
+++ b/libyang/data.py
@@ -1119,38 +1119,37 @@ def cdata_leaf_value(cdata, context: "libyang.Context" = None) -> Any:
             return None
 
         val = c2str(val)
-        term_node = ffi.cast("struct lyd_node_term *", cdata)
-        val_type = ffi.new("const struct lysc_type **", ffi.NULL)
-
-        # get real value type
-        ctx = context.cdata if context else ffi.NULL
-        ret = lib.lyd_value_validate(
-            ctx,
-            term_node.schema,
-            str2c(val),
-            len(val),
-            ffi.NULL,
-            val_type,
-            ffi.NULL,
-        )
 
-        if ret in (lib.LY_SUCCESS, lib.LY_EINCOMPLETE):
-            val_type = val_type[0].basetype
-            if val_type in Type.STR_TYPES:
-                return val
-            if val_type in Type.NUM_TYPES:
-                return int(val)
-            if val_type == Type.BOOL:
-                return val == "true"
-            if val_type == Type.DEC64:
-                return float(val)
-            if val_type == Type.LEAFREF:
-                return DLeaf.cdata_leaf_value(cdata.value.leafref, context)
-            if val_type == Type.EMPTY:
-                return None
+        if cdata.schema == ffi.NULL:
+            # opaq node
             return val
 
-        raise TypeError("value type validation error")
+        if cdata.schema.nodetype == SNode.LEAF:
+            snode = ffi.cast("struct lysc_node_leaf *", cdata.schema)
+        elif cdata.schema.nodetype == SNode.LEAFLIST:
+            snode = ffi.cast("struct lysc_node_leaflist *", cdata.schema)
+
+        # find the real type used
+        cdata = ffi.cast("struct lyd_node_term *", cdata)
+        curr_type = snode.type
+        while curr_type.basetype in (Type.LEAFREF, Type.UNION):
+            if curr_type.basetype == Type.LEAFREF:
+                curr_type = cdata.value.realtype
+            if curr_type.basetype == Type.UNION:
+                curr_type = cdata.value.subvalue.value.realtype
+
+        val_type = curr_type.basetype
+        if val_type in Type.STR_TYPES:
+            return val
+        if val_type in Type.NUM_TYPES:
+            return int(val)
+        if val_type == Type.BOOL:
+            return val == "true"
+        if val_type == Type.DEC64:
+            return float(val)
+        if val_type == Type.EMPTY:
+            return None
+        return val
 
 
 # -------------------------------------------------------------------------------------
diff --git a/tests/test_data.py b/tests/test_data.py
index 790b5cd..1728042 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -1110,4 +1110,5 @@ def test_dnode_builtin_plugins_only(self):
         module = self.ctx.load_module("yolo-nodetypes")
         dnode = dict_to_dnode(MAIN, module, None, validate=False, store_only=True)
         self.assertIsInstance(dnode, DLeaf)
+        self.assertEqual(dnode.value(), "test")
         dnode.free()