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https://git.rwth-aachen.de/acs/public/villas/node/
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106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/** Hook funktions
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*
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* Every path can register a hook function which is called for every received
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* message. This can be used to debug the data flow, get statistics
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* or alter the message.
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*
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* This file includes some examples.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @addtogroup hooks User-defined hook functions
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* @ingroup path
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* @{
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*********************************************************************************/
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#pragma once
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#include <villas/hook_type.h>
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#include <villas/common.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Forward declarations */
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struct path;
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struct sample;
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struct list;
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/** Descriptor for user defined hooks. See hooks[]. */
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struct hook {
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enum state state;
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struct path *path;
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struct node *node;
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struct hook_type *_vt; /**< C++ like Vtable pointer. */
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void *_vd; /**< Private data for this hook. This pointer can be used to pass data between consecutive calls of the callback. */
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int priority; /**< A priority to change the order of execution within one type of hook. */
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json_t *cfg; /**< A JSON object containing the configuration of the hook. */
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};
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int hook_init(struct hook *h, struct hook_type *vt, struct path *p, struct node *n);
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int hook_parse(struct hook *h, json_t *cfg);
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int hook_parse_cli(struct hook *h, int argc, char *argv[]);
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int hook_destroy(struct hook *h);
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int hook_start(struct hook *h);
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int hook_stop(struct hook *h);
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int hook_periodic(struct hook *h);
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int hook_restart(struct hook *h);
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int hook_read(struct hook *h, struct sample *smps[], unsigned *cnt);
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int hook_process(struct hook *h, struct sample *smps[], unsigned *cnt);
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int hook_write(struct hook *h, struct sample *smps[], unsigned *cnt);
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int hook_read_list(struct list *hs, struct sample *smps[], unsigned cnt);
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int hook_process_list(struct list *hs, struct sample *smps[], unsigned cnt);
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int hook_write_list(struct list *hs, struct sample *smps[], unsigned cnt);
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/** Compare two hook functions with their priority. Used by list_sort() */
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int hook_cmp_priority(const void *a, const void *b);
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/** Parses an object of hooks
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*
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* Example:
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*
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* {
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* stats = {
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* output = "stdout"
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* },
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* skip_first = {
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* seconds = 10
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* },
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* hooks = [ "print" ]
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* }
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*/
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int hook_parse_list(struct list *list, json_t *cfg, struct path *p, struct node *n);
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#ifdef __cplusplus
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}
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#endif
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