mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
/** The "restart" API request.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2020, 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 <villas/super_node.hpp>
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#include <villas/log.hpp>
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#include <villas/node/exceptions.hpp>
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#include <villas/utils.hpp>
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#include <villas/api/request.hpp>
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#include <villas/api/response.hpp>
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#include <villas/api/session.hpp>
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namespace villas {
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namespace node {
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namespace api {
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class RestartRequest : public Request {
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protected:
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static std::string configUri;
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static void handler()
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{
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int ret;
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const char *cfg = !configUri.empty()
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? configUri.c_str()
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: nullptr;
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const char *argv[] = { "villas-node", cfg, nullptr };
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Logger logger = logging.get("api");
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logger->info("Restart instance: config={}", cfg);
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ret = execvp("/proc/self/exe", (char **) argv);
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if (ret)
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throw SystemError("Failed to restart");
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}
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public:
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using Request::Request;
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virtual Response * execute()
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{
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int ret;
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json_error_t err;
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if (method != Method::POST)
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throw InvalidMethod(this);
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const char *cfg = nullptr;
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if (body) {
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ret = json_unpack_ex(body, &err, 0, "{ s?: s }", "config", &cfg);
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if (ret < 0)
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throw Error();
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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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configUri = cfg
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? cfg
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: session->getSuperNode()->getConfigUri();
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logger->info("Restarting to {}", configUri.c_str());
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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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auto *json_response = json_pack("{ s: i, s: o }",
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"restarts", cnt,
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"config", configUri.empty()
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? json_null()
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: json_string(configUri.c_str())
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);
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/* Register exit handler */
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ret = atexit(handler);
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if (ret)
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throw Error(HTTP_STATUS_INTERNAL_SERVER_ERROR, "Failed to restart VILLASnode instance");
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/* Properly terminate current instance */
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utils::killme(SIGTERM);
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return new Response(session, json_response);
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}
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};
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std::string RestartRequest::configUri;
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/* Register API request */
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static char n[] = "restart";
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static char r[] = "/restart";
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static char d[] = "restart VILLASnode with new configuration";
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static RequestPlugin<RestartRequest, n, r, d> p;
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} /* namespace api */
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} /* namespace node */
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} /* namespace villas */
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