mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-16 00:00:02 +01:00
130 lines
3.3 KiB
C++
130 lines
3.3 KiB
C++
/** The "restart" API request.
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*
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* @author Steffen Vogel <post@steffenvogel.de>
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* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license Apache 2.0
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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:restart");
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if (cfg)
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logger->info("Restarting instance: config={}", cfg);
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else
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logger->info("Restarting instance");
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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 != Session::Method::POST)
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throw InvalidMethod(this);
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json_t *json_config = nullptr;
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if (body) {
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ret = json_unpack_ex(body, &err, 0, "{ s?: o }",
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"config", &json_config
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);
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if (ret < 0)
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throw BadRequest("Failed to parse request body");
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}
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if (json_config) {
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if (json_is_string(json_config))
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configUri = json_string_value(json_config);
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else if (json_is_object(json_config)) {
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char configUriBuf[] = "villas-node.json.XXXXXX";
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int configFd = mkstemp(configUriBuf);
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FILE *configFile = fdopen(configFd, "w+");
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ret = json_dumpf(json_config, configFile, JSON_INDENT(4));
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if (ret < 0)
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throw Error(HTTP_STATUS_INTERNAL_SERVER_ERROR, "Failed to create temporary config file");
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fclose(configFile);
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configUri = configUriBuf;
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}
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else if (json_config != nullptr)
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throw BadRequest("Parameter 'config' must be either a URL (string) or a configuration (object)");
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}
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else /* If no config is provided via request, we will use the previous one */
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configUri = session->getSuperNode()->getConfigUri();
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logger->info("Restarting to {}", configUri);
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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 JsonResponse(session, HTTP_STATUS_OK, 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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