mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/** The "restart" API action.
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*
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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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#include <string.h>
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#include <villas/plugin.h>
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#include <villas/api.h>
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#include <villas/super_node.h>
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#include <villas/log.h>
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static char *config;
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void api_restart_handler()
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{
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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)
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serror("Failed to restart");
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}
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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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{
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int ret;
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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) {
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*resp = json_string("failed to parse request");
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return -1;
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}
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}
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/* If no config is provided via request, we will use the previous one */
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if (!cfg)
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cfg = s->api->super_node->uri;
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config = strdup(cfg);
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info("restarting to %s", config);
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/* Increment API restart counter */
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char *scnt = getenv("VILLAS_API_RESTART_COUNT");
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int cnt = scnt ? atoi(scnt) : 0;
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char buf[32];
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snprintf(buf, sizeof(buf), "%d", cnt + 1);
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/* We pass some env variables to the new process */
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setenv("VILLAS_API_RESTART_COUNT", buf, 1);
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*resp = json_pack("{ s: i, s: s }",
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"restarts", cnt,
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"config", config
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);
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/* Register exit handler */
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ret = atexit(api_restart_handler);
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if (ret)
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return 0;
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/* Properly terminate current instance */
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killme(SIGTERM);
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return 0;
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}
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static struct plugin p = {
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.name = "restart",
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.description = "restart VILLASnode with new configuration",
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.type = PLUGIN_TYPE_API,
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.api.cb = api_restart
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};
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REGISTER_PLUGIN(&p)
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