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lib: add ability to register dependencies between northbound nodes

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Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>
This commit is contained in:
Igor Ryzhov 2021-02-16 12:49:25 +03:00
parent 9ee2ebdc82
commit f182d8d8a2
2 changed files with 69 additions and 4 deletions
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60
lib/northbound.c
View File

@ -185,6 +185,25 @@ struct nb_node *nb_node_find(const char *xpath)
return snode->priv;
}
void nb_node_set_dependency_cbs(const char *dependency_xpath,
const char *dependant_xpath,
struct nb_dependency_callbacks *cbs)
{
struct nb_node *dependency = nb_node_find(dependency_xpath);
struct nb_node *dependant = nb_node_find(dependant_xpath);
if (!dependency || !dependant)
return;
dependency->dep_cbs.get_dependant_xpath = cbs->get_dependant_xpath;
dependant->dep_cbs.get_dependency_xpath = cbs->get_dependency_xpath;
}
bool nb_node_has_dependency(struct nb_node *node)
{
return node->dep_cbs.get_dependency_xpath != NULL;
}
static int nb_node_validate_cb(const struct nb_node *nb_node,
enum nb_operation operation,
int callback_implemented, bool optional)
@ -532,8 +551,9 @@ int nb_candidate_edit(struct nb_config *candidate,
const struct yang_data *previous,
const struct yang_data *data)
{
struct lyd_node *dnode;
struct lyd_node *dnode, *dep_dnode;
char xpath_edit[XPATH_MAXLEN];
char dep_xpath[XPATH_MAXLEN];
/* Use special notation for leaf-lists (RFC 6020, section 9.13.5). */
if (nb_node->snode->nodetype == LYS_LEAFLIST)
@ -549,9 +569,33 @@ int nb_candidate_edit(struct nb_config *candidate,
dnode = lyd_new_path(candidate->dnode, ly_native_ctx,
xpath_edit, (void *)data->value, 0,
LYD_PATH_OPT_UPDATE);
if (!dnode && ly_errno) {
flog_warn(EC_LIB_LIBYANG, "%s: lyd_new_path() failed",
__func__);
if (dnode) {
/*
* create dependency
*
* dnode returned by the lyd_new_path may be from a
* different schema, so we need to update the nb_node
*/
nb_node = dnode->schema->priv;
if (nb_node->dep_cbs.get_dependency_xpath) {
nb_node->dep_cbs.get_dependency_xpath(
dnode, dep_xpath);
ly_errno = 0;
dep_dnode = lyd_new_path(candidate->dnode,
ly_native_ctx,
dep_xpath, NULL, 0,
LYD_PATH_OPT_UPDATE);
if (!dep_dnode && ly_errno) {
flog_warn(EC_LIB_LIBYANG,
"%s: lyd_new_path(%s) failed",
__func__, dep_xpath);
return NB_ERR;
}
}
} else if (ly_errno) {
flog_warn(EC_LIB_LIBYANG, "%s: lyd_new_path(%s) failed",
__func__, xpath_edit);
return NB_ERR;
}
break;
@ -563,6 +607,14 @@ int nb_candidate_edit(struct nb_config *candidate,
* whether to ignore it or not.
*/
return NB_ERR_NOT_FOUND;
/* destroy dependant */
if (nb_node->dep_cbs.get_dependant_xpath) {
nb_node->dep_cbs.get_dependant_xpath(dnode, dep_xpath);
dep_dnode = yang_dnode_get(candidate->dnode, dep_xpath);
if (dep_dnode)
lyd_free(dep_dnode);
}
lyd_free(dnode);
break;
case NB_OP_MOVE:

13
lib/northbound.h
View File

@ -509,6 +509,11 @@ struct nb_callbacks {
void (*cli_show_end)(struct vty *vty, struct lyd_node *dnode);
};
struct nb_dependency_callbacks {
void (*get_dependant_xpath)(const struct lyd_node *dnode, char *xpath);
void (*get_dependency_xpath)(const struct lyd_node *dnode, char *xpath);
};
/*
* Northbound-specific data that is allocated for each schema node of the native
* YANG modules.
@ -523,6 +528,8 @@ struct nb_node {
/* Priority - lower priorities are processed first. */
uint32_t priority;
struct nb_dependency_callbacks dep_cbs;
/* Callbacks implemented for this node. */
struct nb_callbacks cbs;
@ -722,6 +729,12 @@ void nb_nodes_delete(void);
*/
extern struct nb_node *nb_node_find(const char *xpath);
extern void nb_node_set_dependency_cbs(const char *dependency_xpath,
const char *dependant_xpath,
struct nb_dependency_callbacks *cbs);
bool nb_node_has_dependency(struct nb_node *node);
/*
* Create a new northbound configuration.
*