mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
121 lines
3.4 KiB
C++
121 lines
3.4 KiB
C++
/* The "restart" API request.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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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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#include <villas/log.hpp>
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#include <villas/node/exceptions.hpp>
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#include <villas/super_node.hpp>
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#include <villas/utils.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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int ret;
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const char *cfg = !configUri.empty() ? configUri.c_str() : 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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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 }", "config", &json_config);
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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,
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"Failed to create temporary config file");
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fclose(configFile);
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configUri = configUriBuf;
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} else if (json_config != nullptr)
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throw BadRequest("Parameter 'config' must be either a URL (string) or "
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"a configuration (object)");
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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(
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"{ s: i, s: o }", "restarts", cnt, "config",
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configUri.empty() ? json_null() : json_string(configUri.c_str()));
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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,
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"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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