/** The "restart" API action. * * @author Steffen Vogel * @copyright 2017, 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 . *********************************************************************************/ #include #include #include #include #include static char *config; void api_restart_handler() { int ret; char *argv[] = { "villas-node", config, NULL }; ret = execvp("/proc/self/exe", argv); if (ret) serror("Failed to restart"); } static int api_restart(struct api_action *h, json_t *args, json_t **resp, struct api_session *s) { int ret; json_error_t err; char *cfg = NULL; if (args) { ret = json_unpack_ex(args, &err, 0, "{ s?: s }", "config", &cfg); if (ret < 0) { *resp = json_string("failed to parse request"); return -1; } } /* 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); /* 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); *resp = json_pack("{ s: i, s: s }", "restarts", cnt, "config", config ); /* Register exit handler */ ret = atexit(api_restart_handler); if (ret) return 0; /* Properly terminate current instance */ killme(SIGTERM); return 0; } static struct plugin p = { .name = "restart", .description = "restart VILLASnode with new configuration", .type = PLUGIN_TYPE_API, .api.cb = api_restart }; REGISTER_PLUGIN(&p)