add signal handlers

main.cpp

@@ -3,6 +3,9 @@
 #include <string>
 #include <iostream>
 #include <sstream>
+#include <csignal>
+
+httplib::Server *g_svr = nullptr;
 
 std::string stripLabel(const std::string &label) {
 	const std::string prefix = "__label__";
@@ -59,8 +62,13 @@ int main(int argc, char *argv[]) {
 		res.set_content(result, "application/json");
 	});
 
+	g_svr = &svr;
+	std::signal(SIGINT,  [](int) { if (g_svr) g_svr->stop(); });
+	std::signal(SIGTERM, [](int) { if (g_svr) g_svr->stop(); });
+
 	auto port = std::stoi(argv[2]);
 	std::cout << "Starting server on port " << port << std::endl;
 	svr.listen("0.0.0.0", port);
+	std::cout << "Server stopped" << std::endl;
 	return 0;
 }