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lib: add and use new yang function for finding schema nodes

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Add a wrapper around lys_find_xpath which has an unfortunate API
returning an allocated set of schema nodes when we only ever expect and
want one.

Another libyang function `lys_find_path` returns a single node; however,
that function can assert/abort on invalid path values so is unsuitable
for user input.

Replace previous uses of `lys_find_path` with new API when dealing with
possible invalid path values (i.e., from a user).

Signed-off-by: Christian Hopps <chopps@labn.net>
This commit is contained in:
Christian Hopps 2023-04-17 01:09:05 -04:00
parent eee1fca3eb
commit 9e0241c8fb
5 changed files with 46 additions and 9 deletions
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2
lib/northbound.c
View File

@ -167,7 +167,7 @@ struct nb_node *nb_node_find(const char *path)
* Use libyang to find the schema node associated to the path and get
* the northbound node from there (snode private pointer).
*/
snode = lys_find_path(ly_native_ctx, NULL, path, 0);
snode = yang_find_snode(ly_native_ctx, path, 0);
if (!snode)
return NULL;

17
lib/yang.c
View File

@ -250,6 +250,23 @@ void yang_snode_get_path(const struct lysc_node *snode,
}
}
struct lysc_node *yang_find_snode(struct ly_ctx *ly_ctx, const char *xpath,
uint32_t options)
{
struct lysc_node *snode;
struct ly_set *set;
LY_ERR err;
err = lys_find_xpath(ly_native_ctx, NULL, xpath, options, &set);
if (err || !set->count)
return NULL;
snode = set->snodes[0];
ly_set_free(set, NULL);
return snode;
}
struct lysc_node *yang_snode_real_parent(const struct lysc_node *snode)
{
struct lysc_node *parent = snode->parent;

21
lib/yang.h
View File

@ -210,6 +210,27 @@ extern void yang_snode_get_path(const struct lysc_node *snode,
enum yang_path_type type, char *xpath,
size_t xpath_len);
/*
* Find libyang schema node for the given xpath. Uses `lys_find_xpath`,
* returning only the first of a set of nodes -- normally there should only
* be one.
*
* ly_ctx
* libyang context to operate on.
*
* xpath
* XPath expression (absolute or relative) to find the schema node for.
*
* options
* Libyang findxpathoptions value (see lys_find_xpath).
*
* Returns:
* The libyang schema node if found, or NULL if not found.
*/
extern struct lysc_node *yang_find_snode(struct ly_ctx *ly_ctx,
const char *xpath, uint32_t options);
/*
* Find first parent schema node which is a presence-container or a list
* (non-presence containers are ignored).

9
lib/yang_translator.c
View File

@ -235,8 +235,8 @@ struct yang_translator *yang_translator_load(const char *path)
xpath_custom =
yang_dnode_get_string(set->dnodes[i], "./custom");
snode_custom = lys_find_path(translator->ly_ctx, NULL,
xpath_custom, 0);
snode_custom =
yang_find_snode(translator->ly_ctx, xpath_custom, 0);
if (!snode_custom) {
flog_warn(EC_LIB_YANG_TRANSLATOR_LOAD,
"%s: unknown data path: %s", __func__,
@ -247,8 +247,7 @@ struct yang_translator *yang_translator_load(const char *path)
xpath_native =
yang_dnode_get_string(set->dnodes[i], "./native");
snode_native =
lys_find_path(ly_native_ctx, NULL, xpath_native, 0);
snode_native = yang_find_snode(ly_native_ctx, xpath_native, 0);
if (!snode_native) {
flog_warn(EC_LIB_YANG_TRANSLATOR_LOAD,
"%s: unknown data path: %s", __func__,
@ -315,7 +314,7 @@ yang_translate_xpath(const struct yang_translator *translator, int dir,
else
ly_ctx = ly_native_ctx;
snode = lys_find_path(ly_ctx, NULL, xpath, 0);
snode = yang_find_snode(ly_ctx, xpath, 0);
if (!snode) {
flog_warn(EC_LIB_YANG_TRANSLATION_ERROR,
"%s: unknown data path: %s", __func__, xpath);

6
lib/yang_wrappers.c
View File

@ -89,7 +89,7 @@ static const char *yang_get_default_value(const char *xpath)
const struct lysc_node *snode;
const char *value;
snode = lys_find_path(ly_native_ctx, NULL, xpath, 0);
snode = yang_find_snode(ly_native_ctx, xpath, 0);
if (snode == NULL) {
flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
"%s: unknown data path: %s", __func__, xpath);
@ -206,7 +206,7 @@ int yang_str2enum(const char *xpath, const char *value)
const struct lysc_type_enum *type;
const struct lysc_type_bitenum_item *enums;
snode = lys_find_path(ly_native_ctx, NULL, xpath, 0);
snode = yang_find_snode(ly_native_ctx, xpath, 0);
if (snode == NULL) {
flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
"%s: unknown data path: %s", __func__, xpath);
@ -241,7 +241,7 @@ struct yang_data *yang_data_new_enum(const char *xpath, int value)
const struct lysc_type_enum *type;
const struct lysc_type_bitenum_item *enums;
snode = lys_find_path(ly_native_ctx, NULL, xpath, 0);
snode = yang_find_snode(ly_native_ctx, xpath, 0);
if (snode == NULL) {
flog_err(EC_LIB_YANG_UNKNOWN_DATA_PATH,
"%s: unknown data path: %s", __func__, xpath);