/* REST-API-releated functions.

*

* Author: Steffen Vogel <post@steffenvogel.de>

* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University

* SPDX-License-Identifier: Apache-2.0

*/

#include <villas/api.hpp>

#include <villas/api/request.hpp>

#include <villas/api/session.hpp>

#include <villas/compat.hpp>

#include <villas/node/config.hpp>

#include <villas/node/memory.hpp>

#include <villas/utils.hpp>

#include <villas/web.hpp>

using namespace villas;

using namespace villas::node;

using namespace villas::node::api;

Error Error::invalidMethod(Request *req) {

return badRequest(

nullptr, "The '{}' API endpoint does not support {} requests",

req->factory->getName(), Session::methodToString(req->method));

}

Api::Api(SuperNode *sn)

: logger(Log::get("api")), state(State::INITIALIZED), super_node(sn) {}

Api::~Api() {

if (state == State::STARTED)

stop();

}

void Api::start() {

assert(state != State::STARTED);

logger->info("Starting sub-system");

running = true;

thread = std::thread(&Api::worker, this);

state = State::STARTED;

}

void Api::stop() {

assert(state == State::STARTED);

logger->info("Stopping sub-system");

for (Session *s : sessions)

s->shutdown();

for (int i = 0; i < 2 && sessions.size() > 0; i++) {

logger->info("Waiting for {} sessions to terminate", sessions.size());

usleep(1 * 1e6);

}

running = false;

pending.push(nullptr); // unblock thread

thread.join();

state = State::STOPPED;

}

void Api::worker() {

logger->info("Started worker");

// Process pending requests

while (running) {

Session *s = pending.pop();

if (s) {

// Check that the session is still alive

auto it = std::find(sessions.begin(), sessions.end(), s);

if (it != sessions.end())

s->execute();

}

}

logger->info("Stopped worker");

}