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VILLASnode/lib/api/actions/restart.c

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/** The "restart" API action.
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*
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @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.
*
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* 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.
*
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* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <string.h>
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#include <villas/plugin.h>
#include <villas/api.h>
#include <villas/super_node.h>
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#include <villas/log.h>
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static char *config;
void api_restart_handler()
{
int ret;
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char *argv[] = { "villas-node", config, NULL };
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ret = execvp("/proc/self/exe", argv);
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if (ret)
serror("Failed to restart");
}
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static int api_restart(struct api_action *h, json_t *args, json_t **resp, struct api_session *s)
{
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int ret;
json_error_t err;
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char *cfg = NULL;
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if (args) {
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ret = json_unpack_ex(args, &err, 0, "{ s?: s }", "config", &cfg);
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if (ret < 0) {
*resp = json_string("failed to parse request");
return -1;
}
}
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/* If no config is provided via request, we will use the previous one */
if (!cfg)
cfg = s->api->super_node->uri;
config = strdup(cfg);
info("restarting to %s", config);
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/* Increment API restart counter */
char *scnt = getenv("VILLAS_API_RESTART_COUNT");
int cnt = scnt ? atoi(scnt) : 0;
char buf[32];
snprintf(buf, sizeof(buf), "%d", cnt + 1);
/* We pass some env variables to the new process */
setenv("VILLAS_API_RESTART_COUNT", buf, 1);
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*resp = json_pack("{ s: i, s: s }",
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"restarts", cnt,
"config", config
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);
/* Register exit handler */
ret = atexit(api_restart_handler);
if (ret)
return 0;
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/* Properly terminate current instance */
killme(SIGTERM);
return 0;
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}
static struct plugin p = {
.name = "restart",
.description = "restart VILLASnode with new configuration",
.type = PLUGIN_TYPE_API,
.api.cb = api_restart
};
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REGISTER_PLUGIN(&p)