/*
* Returned value should be freed with xmlFree().
*/
static char *cx_get_text_node_value(xmlXPathContextPtr xpath_ctx, /* {{{ */
char *expr, const char *from_option) {
xmlXPathObjectPtr values_node_obj = cx_evaluate_xpath(xpath_ctx, expr);
if (values_node_obj == NULL)
return NULL; /* Error already logged. */
xmlNodeSetPtr values_node = values_node_obj->nodesetval;
size_t tmp_size = (values_node) ? values_node->nodeNr : 0;
if (tmp_size == 0) {
WARNING("curl_xml plugin: "
"relative xpath expression \"%s\" from '%s' doesn't match "
"any of the nodes.",
expr, from_option);
xmlXPathFreeObject(values_node_obj);
return NULL;
}
if (tmp_size > 1) {
WARNING("curl_xml plugin: "
"relative xpath expression \"%s\" from '%s' is expected to return "
"only one text node. Skipping the node.",
expr, from_option);
xmlXPathFreeObject(values_node_obj);
return NULL;
}
/* ignoring the element if other than textnode/attribute*/
if (cx_if_not_text_node(values_node->nodeTab[0])) {
WARNING("curl_xml plugin: "
"relative xpath expression \"%s\" from '%s' is expected to return "
"only text/attribute node which is not the case. "
"Skipping the node.",
expr, from_option);
xmlXPathFreeObject(values_node_obj);
return NULL;
}
char *node_value = (char *)xmlNodeGetContent(values_node->nodeTab[0]);
/* free up object */
xmlXPathFreeObject(values_node_obj);
return node_value;
} /* }}} char * cx_get_text_node_value */
static int cx_handle_base_xpath (char const *plugin_instance, /* {{{ */
char const *host,
xmlXPathContextPtr xpath_ctx, const data_set_t *ds,
char *base_xpath, cx_xpath_t *xpath)
{
int total_nodes;
int i;
xmlXPathObjectPtr base_node_obj = NULL;
xmlNodeSetPtr base_nodes = NULL;
value_list_t vl = VALUE_LIST_INIT;
base_node_obj = cx_evaluate_xpath (xpath_ctx, BAD_CAST base_xpath);
if (base_node_obj == NULL)
return -1; /* error is logged already */
base_nodes = base_node_obj->nodesetval;
total_nodes = (base_nodes) ? base_nodes->nodeNr : 0;
if (total_nodes == 0)
{
ERROR ("curl_xml plugin: "
"xpath expression \"%s\" doesn't match any of the nodes. "
"Skipping the xpath block...", base_xpath);
xmlXPathFreeObject (base_node_obj);
return -1;
}
/* If base_xpath returned multiple results, then */
/* Instance in the xpath block is required */
if (total_nodes > 1 && xpath->instance == NULL)
{
ERROR ("curl_xml plugin: "
"InstanceFrom is must in xpath block since the base xpath expression \"%s\" "
"returned multiple results. Skipping the xpath block...", base_xpath);
return -1;
}
/* set the values for the value_list */
vl.values_len = ds->ds_num;
sstrncpy (vl.type, xpath->type, sizeof (vl.type));
sstrncpy (vl.plugin, "curl_xml", sizeof (vl.plugin));
sstrncpy (vl.host, (host != NULL) ? host : hostname_g, sizeof (vl.host));
if (plugin_instance != NULL)
sstrncpy (vl.plugin_instance, plugin_instance, sizeof (vl.plugin_instance));
for (i = 0; i < total_nodes; i++)
{
int status;
xpath_ctx->node = base_nodes->nodeTab[i];
status = cx_handle_instance_xpath (xpath_ctx, xpath, &vl,
/* is_table = */ (total_nodes > 1));
if (status != 0)
continue; /* An error has already been reported. */
status = cx_handle_all_value_xpaths (xpath_ctx, xpath, ds, &vl);
if (status != 0)
continue; /* An error has been logged. */
} /* for (i = 0; i < total_nodes; i++) */
/* free up the allocated memory */
xmlXPathFreeObject (base_node_obj);
return (0);
} /* }}} cx_handle_base_xpath */
static int cx_handle_instance_xpath (xmlXPathContextPtr xpath_ctx, /* {{{ */
cx_xpath_t *xpath, value_list_t *vl,
_Bool is_table)
{
xmlXPathObjectPtr instance_node_obj = NULL;
xmlNodeSetPtr instance_node = NULL;
memset (vl->type_instance, 0, sizeof (vl->type_instance));
/* If the base xpath returns more than one block, the result is assumed to be
* a table. The `Instance' option is not optional in this case. Check for the
* condition and inform the user. */
if (is_table && (xpath->instance == NULL))
{
WARNING ("curl_xml plugin: "
"Base-XPath %s is a table (more than one result was returned), "
"but no instance-XPath has been defined.",
xpath->path);
return (-1);
}
/* instance has to be an xpath expression */
if (xpath->instance != NULL)
{
int tmp_size;
instance_node_obj = cx_evaluate_xpath (xpath_ctx, BAD_CAST xpath->instance);
if (instance_node_obj == NULL)
return (-1); /* error is logged already */
instance_node = instance_node_obj->nodesetval;
tmp_size = (instance_node) ? instance_node->nodeNr : 0;
if (tmp_size <= 0)
{
WARNING ("curl_xml plugin: "
"relative xpath expression for 'InstanceFrom' \"%s\" doesn't match "
"any of the nodes. Skipping the node.", xpath->instance);
xmlXPathFreeObject (instance_node_obj);
return (-1);
}
if (tmp_size > 1)
{
WARNING ("curl_xml plugin: "
"relative xpath expression for 'InstanceFrom' \"%s\" is expected "
"to return only one text node. Skipping the node.", xpath->instance);
xmlXPathFreeObject (instance_node_obj);
return (-1);
}
/* ignoring the element if other than textnode/attribute */
if (cx_if_not_text_node(instance_node->nodeTab[0]))
{
WARNING ("curl_xml plugin: "
"relative xpath expression \"%s\" is expected to return only text node "
"which is not the case. Skipping the node.", xpath->instance);
xmlXPathFreeObject (instance_node_obj);
return (-1);
}
} /* if (xpath->instance != NULL) */
if (xpath->instance_prefix != NULL)
{
if (instance_node != NULL)
{
char *node_value = (char *) xmlNodeGetContent(instance_node->nodeTab[0]);
ssnprintf (vl->type_instance, sizeof (vl->type_instance),"%s%s",
xpath->instance_prefix, node_value);
sfree (node_value);
}
else
sstrncpy (vl->type_instance, xpath->instance_prefix,
sizeof (vl->type_instance));
}
else
{
/* If instance_prefix and instance_node are NULL, then
* don't set the type_instance */
if (instance_node != NULL)
{
char *node_value = (char *) xmlNodeGetContent(instance_node->nodeTab[0]);
sstrncpy (vl->type_instance, node_value, sizeof (vl->type_instance));
sfree (node_value);
}
}
/* Free `instance_node_obj' this late, because `instance_node' points to
* somewhere inside this structure. */
xmlXPathFreeObject (instance_node_obj);
return (0);
} /* }}} int cx_handle_instance_xpath */
static int cx_handle_single_value_xpath (xmlXPathContextPtr xpath_ctx, /* {{{ */
cx_xpath_t *xpath,
const data_set_t *ds, value_list_t *vl, int index)
{
xmlXPathObjectPtr values_node_obj;
xmlNodeSetPtr values_node;
int tmp_size;
char *node_value;
values_node_obj = cx_evaluate_xpath (xpath_ctx, BAD_CAST xpath->values[index].path);
if (values_node_obj == NULL)
return (-1); /* Error already logged. */
values_node = values_node_obj->nodesetval;
tmp_size = (values_node) ? values_node->nodeNr : 0;
if (tmp_size == 0)
{
WARNING ("curl_xml plugin: "
"relative xpath expression \"%s\" doesn't match any of the nodes. "
"Skipping...", xpath->values[index].path);
xmlXPathFreeObject (values_node_obj);
return (-1);
}
if (tmp_size > 1)
{
WARNING ("curl_xml plugin: "
"relative xpath expression \"%s\" is expected to return "
"only one node. Skipping...", xpath->values[index].path);
xmlXPathFreeObject (values_node_obj);
return (-1);
}
/* ignoring the element if other than textnode/attribute*/
if (cx_if_not_text_node(values_node->nodeTab[0]))
{
WARNING ("curl_xml plugin: "
"relative xpath expression \"%s\" is expected to return "
"only text/attribute node which is not the case. Skipping...",
xpath->values[index].path);
xmlXPathFreeObject (values_node_obj);
return (-1);
}
node_value = (char *) xmlNodeGetContent(values_node->nodeTab[0]);
switch (ds->ds[index].type)
{
case DS_TYPE_COUNTER:
vl->values[index].counter = (counter_t) strtoull (node_value,
/* endptr = */ NULL, /* base = */ 0);
break;
case DS_TYPE_DERIVE:
vl->values[index].derive = (derive_t) strtoll (node_value,
/* endptr = */ NULL, /* base = */ 0);
break;
case DS_TYPE_ABSOLUTE:
vl->values[index].absolute = (absolute_t) strtoull (node_value,
/* endptr = */ NULL, /* base = */ 0);
break;
case DS_TYPE_GAUGE:
vl->values[index].gauge = (gauge_t) strtod (node_value,
/* endptr = */ NULL);
}
/* free up object */
xmlXPathFreeObject (values_node_obj);
sfree (node_value);
/* We have reached here which means that
* we have got something to work */
return (0);
} /* }}} int cx_handle_single_value_xpath */
static int cx_handle_xpath(const cx_t *db, /* {{{ */
xmlXPathContextPtr xpath_ctx, cx_xpath_t *xpath) {
const data_set_t *ds = plugin_get_ds(xpath->type);
if (cx_check_type(ds, xpath) != 0)
return -1;
xmlXPathObjectPtr base_node_obj = cx_evaluate_xpath(xpath_ctx, xpath->path);
if (base_node_obj == NULL)
return -1; /* error is logged already */
xmlNodeSetPtr base_nodes = base_node_obj->nodesetval;
int total_nodes = (base_nodes) ? base_nodes->nodeNr : 0;
if (total_nodes == 0) {
ERROR("curl_xml plugin: "
"xpath expression \"%s\" doesn't match any of the nodes. "
"Skipping the xpath block...",
xpath->path);
xmlXPathFreeObject(base_node_obj);
return -1;
}
/* If base_xpath returned multiple results, then */
/* InstanceFrom or PluginInstanceFrom in the xpath block is required */
if (total_nodes > 1 && xpath->instance == NULL &&
xpath->plugin_instance_from == NULL) {
ERROR("curl_xml plugin: "
"InstanceFrom or PluginInstanceFrom is must in xpath block "
"since the base xpath expression \"%s\" "
"returned multiple results. Skipping the xpath block...",
xpath->path);
xmlXPathFreeObject(base_node_obj);
return -1;
}
value_list_t vl = VALUE_LIST_INIT;
/* set the values for the value_list */
vl.values_len = ds->ds_num;
sstrncpy(vl.type, xpath->type, sizeof(vl.type));
sstrncpy(vl.plugin, (db->plugin_name != NULL) ? db->plugin_name : "curl_xml",
sizeof(vl.plugin));
sstrncpy(vl.host, cx_host(db), sizeof(vl.host));
for (int i = 0; i < total_nodes; i++) {
xpath_ctx->node = base_nodes->nodeTab[i];
if (db->instance != NULL)
sstrncpy(vl.plugin_instance, db->instance, sizeof(vl.plugin_instance));
if (cx_handle_instance_xpath(xpath_ctx, xpath, &vl) != 0)
continue; /* An error has already been reported. */
if (cx_handle_all_value_xpaths(xpath_ctx, xpath, ds, &vl) != 0)
continue; /* An error has been logged. */
} /* for (i = 0; i < total_nodes; i++) */
/* free up the allocated memory */
xmlXPathFreeObject(base_node_obj);
return 0;
} /* }}} cx_handle_xpath */
