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VILLASnode/lib/hook.c

272 lines
5.5 KiB
C

/** Hook-releated functions.
*
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
* @license GNU General Public License (version 3)
*
* VILLASnode
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************************/
#include <string.h>
#include <math.h>
#include <villas/timing.h>
#include <villas/config.h>
#include <villas/hook.h>
#include <villas/path.h>
#include <villas/utils.h>
#include <villas/node.h>
#include <villas/plugin.h>
int hook_init(struct hook *h, struct hook_type *vt, struct path *p, struct node *n)
{
int ret;
assert(h->state == STATE_DESTROYED);
h->enabled = 1;
h->priority = vt->priority;
h->path = p;
h->node = n;
h->_vt = vt;
h->_vd = alloc(vt->size);
ret = h->_vt->init ? h->_vt->init(h) : 0;
if (ret)
return ret;
h->state = STATE_INITIALIZED;
return 0;
}
int hook_parse(struct hook *h, json_t *cfg)
{
int ret;
json_error_t err;
assert(h->state != STATE_DESTROYED);
ret = json_unpack_ex(cfg, &err, 0, "{ s?: i, s?: b }",
"priority", &h->priority,
"enabled", &h->enabled
);
if (ret)
jerror(&err, "Failed to parse configuration of hook '%s'", hook_type_name(h->_vt));
ret = h->_vt->parse ? h->_vt->parse(h, cfg) : 0;
if (ret)
return ret;
h->cfg = cfg;
h->state = STATE_PARSED;
return 0;
}
int hook_destroy(struct hook *h)
{
int ret;
assert(h->state != STATE_DESTROYED);
ret = h->_vt->destroy ? h->_vt->destroy(h) : 0;
if (ret)
return ret;
if (h->_vd)
free(h->_vd);
h->state = STATE_DESTROYED;
return 0;
}
int hook_start(struct hook *h)
{
if (!h->enabled)
return 0;
if (h->_vt->start) {
debug(LOG_HOOK | 10, "Start hook %s: priority=%d", hook_type_name(h->_vt), h->priority);
return h->_vt->start(h);
}
else
return 0;
}
int hook_stop(struct hook *h)
{
if (!h->enabled)
return 0;
if (h->_vt->stop) {
debug(LOG_HOOK | 10, "Stopping hook %s: priority=%d", hook_type_name(h->_vt), h->priority);
return h->_vt->stop(h);
}
else
return 0;
}
int hook_periodic(struct hook *h)
{
if (!h->enabled)
return 0;
if (h->_vt->periodic) {
debug(LOG_HOOK | 10, "Periodic hook %s: priority=%d", hook_type_name(h->_vt), h->priority);
return h->_vt->periodic(h);
}
else
return 0;
}
int hook_restart(struct hook *h)
{
if (!h->enabled)
return 0;
if (h->_vt->restart) {
debug(LOG_HOOK | 10, "Restarting hook %s: priority=%d", hook_type_name(h->_vt), h->priority);
return h->_vt->restart(h);
}
else
return 0;
}
int hook_process(struct hook *h, struct sample *smps[], unsigned *cnt)
{
if (!h->enabled)
return 0;
if (h->_vt->process) {
debug(LOG_HOOK | 10, "Process hook %s: priority=%d, cnt=%d", hook_type_name(h->_vt), h->priority, *cnt);
return h->_vt->process(h, smps, cnt);
}
else
return 0;
}
int hook_process_list(struct list *hs, struct sample *smps[], unsigned cnt)
{
unsigned ret;
for (size_t i = 0; i < list_length(hs); i++) {
struct hook *h = (struct hook *) list_at(hs, i);
ret = hook_process(h, smps, &cnt);
if (ret || !cnt)
/* Abort hook processing if earlier hooks removed all samples
* or they returned something non-zero */
break;
}
return cnt;
}
int hook_cmp_priority(const void *a, const void *b)
{
struct hook *ha = (struct hook *) a;
struct hook *hb = (struct hook *) b;
return ha->priority - hb->priority;
}
int hook_parse_list(struct list *list, json_t *cfg, int mask, struct path *o, struct node *n)
{
if (!json_is_array(cfg))
error("Hooks must be configured as a list of objects");
size_t i;
json_t *json_hook;
json_array_foreach(cfg, i, json_hook) {
int ret;
const char *type;
struct hook_type *ht;
json_error_t err;
ret = json_unpack_ex(json_hook, &err, 0, "{ s: s }", "type", &type);
if (ret)
jerror(&err, "Failed to parse hook");
ht = hook_type_lookup(type);
if (!ht)
jerror(&err, "Unkown hook type '%s'", type);
if (!(ht->flags & mask))
error("Hook %s not allowed here.", type);
struct hook *h = (struct hook *) alloc(sizeof(struct hook));
ret = hook_init(h, ht, o, n);
if (ret)
error("Failed to initialize hook: %s", type);
ret = hook_parse(h, json_hook);
if (ret)
jerror(&err, "Failed to parse hook configuration");
list_push(list, h);
}
return 0;
}
int hook_init_builtin_list(struct list *l, bool builtin, int mask, struct path *p, struct node *n)
{
int ret;
assert(l->state == STATE_INITIALIZED);
for (size_t i = 0; i < list_length(&plugins); i++) {
struct plugin *q = (struct plugin *) list_at(&plugins, i);
struct hook *h;
struct hook_type *vt = &q->hook;
if (q->type != PLUGIN_TYPE_HOOK)
continue;
if (builtin &&
vt->flags & HOOK_BUILTIN &&
vt->flags & mask)
{
h = (struct hook *) alloc(sizeof(struct hook));
if (!h)
return -1;
ret = hook_init(h, vt, p, n);
if (ret)
return ret;
list_push(l, h);
}
}
return 0;
}
const char * hook_type_name(struct hook_type *vt)
{
return plugin_name(vt);
}