iserver CHANGE support leafref nodes for setting data to the sysrepo

Since sysrepo does not supposrt to set leafref directly, we have to Resolve
leafref node to its target and set the leafref node with its target type.

Fixes CESNET#16

server/operations.c

@@ -123,6 +123,7 @@ op_set_srval(struct lyd_node *node, char *path, int dup, sr_val_t *val, char **v
     uint32_t i;
     struct lyd_node_leaf_list *leaf;
     const char *str;
+    LY_DATA_TYPE type;
 
     if (!dup) {
         assert(val_buf);
@@ -143,8 +144,9 @@ op_set_srval(struct lyd_node *node, char *path, int dup, sr_val_t *val, char **v
     case LYS_LEAF:
     case LYS_LEAFLIST:
         leaf = (struct lyd_node_leaf_list *)node;
-
-        switch (((struct lys_node_leaf *)node->schema)->type.base) {
+settype:
+        type = leaf->value_type;
+        switch (type & LY_DATA_TYPE_MASK) {
         case LY_TYPE_BINARY:
             val->type = SR_BINARY_T;
             str = leaf->value.binary;
@@ -168,7 +170,7 @@ op_set_srval(struct lyd_node *node, char *path, int dup, sr_val_t *val, char **v
         case LY_TYPE_DEC64:
             val->type = SR_DECIMAL64_T;
             val->data.decimal64_val = (double)leaf->value.dec64;
-            for (i = 0; i < ((struct lys_node_leaf *)node->schema)->type.info.dec64.dig; i++) {
+            for (i = 0; i < ((struct lys_node_leaf *)leaf->schema)->type.info.dec64.dig; i++) {
                 /* shift decimal point */
                 val->data.decimal64_val *= 0.1;
             }
@@ -209,6 +211,7 @@ op_set_srval(struct lyd_node *node, char *path, int dup, sr_val_t *val, char **v
             break;
         case LY_TYPE_INST:
             val->type = SR_INSTANCEID_T;
+            val->data.instanceid_val = dup ? strdup(leaf->value_str) : (char*)leaf->value_str;
             break;
         case LY_TYPE_STRING:
             val->type = SR_STRING_T;
@@ -251,8 +254,11 @@ op_set_srval(struct lyd_node *node, char *path, int dup, sr_val_t *val, char **v
             val->type = SR_UINT64_T;
             val->data.uint64_val = leaf->value.uint64;
             break;
+        case LY_TYPE_LEAFREF:
+            leaf = (struct lyd_node_leaf_list *)leaf->value.leafref;
+            goto settype;
         default:
-            //LY_LEAFREF, LY_DERIVED, LY_UNION
+            //LY_DERIVED, LY_UNION
             val->type = SR_UNKNOWN_T;
             break;
         }