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-rw-r--r--lib/RemoteControl.cpp579
1 files changed, 579 insertions, 0 deletions
diff --git a/lib/RemoteControl.cpp b/lib/RemoteControl.cpp
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+++ b/lib/RemoteControl.cpp
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+/*
+ Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
+ Her Majesty the Queen in Right of Canada (Communications Research
+ Center Canada)
+
+ Copyright (C) 2019
+ Matthias P. Braendli, matthias.braendli@mpb.li
+
+ http://www.opendigitalradio.org
+ */
+/*
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#include <list>
+#include <string>
+#include <iostream>
+#include <string>
+#include <algorithm>
+
+#include "RemoteControl.h"
+
+using namespace std;
+
+RemoteControllerTelnet::~RemoteControllerTelnet()
+{
+ m_active = false;
+
+ if (m_restarter_thread.joinable()) {
+ m_restarter_thread.join();
+ }
+
+ if (m_child_thread.joinable()) {
+ m_child_thread.join();
+ }
+}
+
+void RemoteControllerTelnet::restart()
+{
+ if (m_restarter_thread.joinable()) {
+ m_restarter_thread.join();
+ }
+
+ m_restarter_thread = std::thread(
+ &RemoteControllerTelnet::restart_thread,
+ this, 0);
+}
+
+RemoteControllable::~RemoteControllable() {
+ rcs.remove_controllable(this);
+}
+
+std::list<std::string> RemoteControllable::get_supported_parameters() const {
+ std::list<std::string> parameterlist;
+ for (const auto& param : m_parameters) {
+ parameterlist.push_back(param[0]);
+ }
+ return parameterlist;
+}
+
+void RemoteControllers::add_controller(std::shared_ptr<BaseRemoteController> rc) {
+ m_controllers.push_back(rc);
+}
+
+void RemoteControllers::enrol(RemoteControllable *rc) {
+ controllables.push_back(rc);
+}
+
+void RemoteControllers::remove_controllable(RemoteControllable *rc) {
+ controllables.remove(rc);
+}
+
+std::list< std::vector<std::string> > RemoteControllers::get_param_list_values(const std::string& name) {
+ RemoteControllable* controllable = get_controllable_(name);
+
+ std::list< std::vector<std::string> > allparams;
+ for (auto &param : controllable->get_supported_parameters()) {
+ std::vector<std::string> item;
+ item.push_back(param);
+ try {
+ item.push_back(controllable->get_parameter(param));
+ }
+ catch (const ParameterError &e) {
+ item.push_back(std::string("error: ") + e.what());
+ }
+
+ allparams.push_back(item);
+ }
+ return allparams;
+}
+
+std::string RemoteControllers::get_param(const std::string& name, const std::string& param) {
+ RemoteControllable* controllable = get_controllable_(name);
+ return controllable->get_parameter(param);
+}
+
+void RemoteControllers::check_faults() {
+ for (auto &controller : m_controllers) {
+ if (controller->fault_detected()) {
+ etiLog.level(warn) <<
+ "Detected Remote Control fault, restarting it";
+ controller->restart();
+ }
+ }
+}
+
+RemoteControllable* RemoteControllers::get_controllable_(const std::string& name)
+{
+ auto rc = std::find_if(controllables.begin(), controllables.end(),
+ [&](RemoteControllable* r) { return r->get_rc_name() == name; });
+
+ if (rc == controllables.end()) {
+ throw ParameterError("Module name unknown");
+ }
+ else {
+ return *rc;
+ }
+}
+
+void RemoteControllers::set_param(
+ const std::string& name,
+ const std::string& param,
+ const std::string& value)
+{
+ etiLog.level(info) << "RC: Setting " << name << " " << param
+ << " to " << value;
+ RemoteControllable* controllable = get_controllable_(name);
+ try {
+ return controllable->set_parameter(param, value);
+ }
+ catch (const ios_base::failure& e) {
+ etiLog.level(info) << "RC: Failed to set " << name << " " << param
+ << " to " << value << ": " << e.what();
+ throw ParameterError("Cannot understand value");
+ }
+}
+
+// This runs in a separate thread, because
+// it would take too long to be done in the main loop
+// thread.
+void RemoteControllerTelnet::restart_thread(long)
+{
+ m_active = false;
+
+ if (m_child_thread.joinable()) {
+ m_child_thread.join();
+ }
+
+ m_child_thread = std::thread(&RemoteControllerTelnet::process, this, 0);
+}
+
+void RemoteControllerTelnet::handle_accept(Socket::TCPSocket&& socket)
+{
+ const std::string welcome = PACKAGE_NAME " Remote Control CLI\n"
+ "Write 'help' for help.\n"
+ "**********\n";
+ const std::string prompt = "> ";
+
+ std::string in_message;
+
+ try {
+ etiLog.level(info) << "RC: Accepted";
+
+ socket.sendall(welcome.data(), welcome.size());
+
+ while (m_active and in_message != "quit") {
+ socket.sendall(prompt.data(), prompt.size());
+
+ stringstream in_message_stream;
+
+ char last_char = '\0';
+ try {
+ while (last_char != '\n') {
+ try {
+ auto ret = socket.recv(&last_char, 1, 0, 1000);
+ if (ret == 1) {
+ in_message_stream << last_char;
+ }
+ else {
+ break;
+ }
+ }
+ catch (const Socket::TCPSocket::Timeout&) {
+ if (not m_active) {
+ break;
+ }
+ }
+ }
+ }
+ catch (const Socket::TCPSocket::Interrupted&) {
+ in_message_stream.clear();
+ }
+
+
+ if (in_message_stream.str().size() == 0) {
+ etiLog.level(info) << "RC: Connection terminated";
+ break;
+ }
+
+ std::getline(in_message_stream, in_message);
+
+ while (in_message.length() > 0 &&
+ (in_message[in_message.length()-1] == '\r' ||
+ in_message[in_message.length()-1] == '\n')) {
+ in_message.erase(in_message.length()-1, 1);
+ }
+
+ if (in_message.length() == 0) {
+ continue;
+ }
+
+ etiLog.level(info) << "RC: Got message '" << in_message << "'";
+
+ dispatch_command(socket, in_message);
+ }
+ etiLog.level(info) << "RC: Closing socket";
+ socket.close();
+ }
+ catch (const std::exception& e) {
+ etiLog.level(error) << "Remote control caught exception: " << e.what();
+ }
+}
+
+void RemoteControllerTelnet::process(long)
+{
+ try {
+ m_active = true;
+
+ m_socket.listen(m_port, "localhost");
+
+ etiLog.level(info) << "RC: Waiting for connection on port " << m_port;
+ while (m_active) {
+ auto sock = m_socket.accept(1000);
+
+ if (sock.valid()) {
+ handle_accept(move(sock));
+ etiLog.level(info) << "RC: Connection closed. Waiting for connection on port " << m_port;
+ }
+ }
+ }
+ catch (const runtime_error& e) {
+ etiLog.level(warn) << "RC: Encountered error: " << e.what();
+ }
+
+ etiLog.level(info) << "RC: Leaving";
+ m_fault = true;
+}
+
+static std::vector<std::string> tokenise(const std::string& message) {
+ stringstream ss(message);
+ std::vector<std::string> all_tokens;
+ std::string item;
+
+ while (std::getline(ss, item, ' ')) {
+ all_tokens.push_back(move(item));
+ }
+ return all_tokens;
+}
+
+
+void RemoteControllerTelnet::dispatch_command(Socket::TCPSocket& socket, string command)
+{
+ vector<string> cmd = tokenise(command);
+
+ if (cmd[0] == "help") {
+ reply(socket,
+ "The following commands are supported:\n"
+ " list\n"
+ " * Lists the modules that are loaded and their parameters\n"
+ " show MODULE\n"
+ " * Lists all parameters and their values from module MODULE\n"
+ " get MODULE PARAMETER\n"
+ " * Gets the value for the specified PARAMETER from module MODULE\n"
+ " set MODULE PARAMETER VALUE\n"
+ " * Sets the value for the PARAMETER ofr module MODULE\n"
+ " quit\n"
+ " * Terminate this session\n"
+ "\n");
+ }
+ else if (cmd[0] == "list") {
+ stringstream ss;
+
+ if (cmd.size() == 1) {
+ for (auto &controllable : rcs.controllables) {
+ ss << controllable->get_rc_name() << endl;
+
+ list< vector<string> > params = controllable->get_parameter_descriptions();
+ for (auto &param : params) {
+ ss << "\t" << param[0] << " : " << param[1] << endl;
+ }
+ }
+ }
+ else {
+ reply(socket, "Too many arguments for command 'list'");
+ }
+
+ reply(socket, ss.str());
+ }
+ else if (cmd[0] == "show") {
+ if (cmd.size() == 2) {
+ try {
+ stringstream ss;
+ list< vector<string> > r = rcs.get_param_list_values(cmd[1]);
+ for (auto &param_val : r) {
+ ss << param_val[0] << ": " << param_val[1] << endl;
+ }
+ reply(socket, ss.str());
+
+ }
+ catch (const ParameterError &e) {
+ reply(socket, e.what());
+ }
+ }
+ else {
+ reply(socket, "Incorrect parameters for command 'show'");
+ }
+ }
+ else if (cmd[0] == "get") {
+ if (cmd.size() == 3) {
+ try {
+ string r = rcs.get_param(cmd[1], cmd[2]);
+ reply(socket, r);
+ }
+ catch (const ParameterError &e) {
+ reply(socket, e.what());
+ }
+ }
+ else {
+ reply(socket, "Incorrect parameters for command 'get'");
+ }
+ }
+ else if (cmd[0] == "set") {
+ if (cmd.size() >= 4) {
+ try {
+ stringstream new_param_value;
+ for (size_t i = 3; i < cmd.size(); i++) {
+ new_param_value << cmd[i];
+
+ if (i+1 < cmd.size()) {
+ new_param_value << " ";
+ }
+ }
+
+ rcs.set_param(cmd[1], cmd[2], new_param_value.str());
+ reply(socket, "ok");
+ }
+ catch (const ParameterError &e) {
+ reply(socket, e.what());
+ }
+ catch (const exception &e) {
+ reply(socket, "Error: Invalid parameter value. ");
+ }
+ }
+ else {
+ reply(socket, "Incorrect parameters for command 'set'");
+ }
+ }
+ else if (cmd[0] == "quit") {
+ reply(socket, "Goodbye");
+ }
+ else {
+ reply(socket, "Message not understood");
+ }
+}
+
+void RemoteControllerTelnet::reply(Socket::TCPSocket& socket, string message)
+{
+ stringstream ss;
+ ss << message << "\r\n";
+ socket.sendall(message.data(), message.size());
+}
+
+
+#if defined(HAVE_ZEROMQ)
+
+RemoteControllerZmq::~RemoteControllerZmq() {
+ m_active = false;
+ m_fault = false;
+
+ if (m_restarter_thread.joinable()) {
+ m_restarter_thread.join();
+ }
+
+ if (m_child_thread.joinable()) {
+ m_child_thread.join();
+ }
+}
+
+void RemoteControllerZmq::restart()
+{
+ if (m_restarter_thread.joinable()) {
+ m_restarter_thread.join();
+ }
+
+ m_restarter_thread = std::thread(&RemoteControllerZmq::restart_thread, this);
+}
+
+// This runs in a separate thread, because
+// it would take too long to be done in the main loop
+// thread.
+void RemoteControllerZmq::restart_thread()
+{
+ m_active = false;
+
+ if (m_child_thread.joinable()) {
+ m_child_thread.join();
+ }
+
+ m_child_thread = std::thread(&RemoteControllerZmq::process, this);
+}
+
+void RemoteControllerZmq::recv_all(zmq::socket_t& pSocket, std::vector<std::string> &message)
+{
+ bool more = true;
+ do {
+ zmq::message_t msg;
+ pSocket.recv(&msg);
+ std::string incoming((char*)msg.data(), msg.size());
+ message.push_back(incoming);
+ more = msg.more();
+ } while (more);
+}
+
+void RemoteControllerZmq::send_ok_reply(zmq::socket_t &pSocket)
+{
+ zmq::message_t msg(2);
+ char repCode[2] = {'o', 'k'};
+ memcpy ((void*) msg.data(), repCode, 2);
+ pSocket.send(msg, 0);
+}
+
+void RemoteControllerZmq::send_fail_reply(zmq::socket_t &pSocket, const std::string &error)
+{
+ zmq::message_t msg1(4);
+ char repCode[4] = {'f', 'a', 'i', 'l'};
+ memcpy ((void*) msg1.data(), repCode, 4);
+ pSocket.send(msg1, ZMQ_SNDMORE);
+
+ zmq::message_t msg2(error.length());
+ memcpy ((void*) msg2.data(), error.c_str(), error.length());
+ pSocket.send(msg2, 0);
+}
+
+void RemoteControllerZmq::process()
+{
+ m_fault = false;
+
+ // create zmq reply socket for receiving ctrl parameters
+ try {
+ zmq::socket_t repSocket(m_zmqContext, ZMQ_REP);
+
+ // connect the socket
+ int hwm = 100;
+ int linger = 0;
+ repSocket.setsockopt(ZMQ_RCVHWM, &hwm, sizeof(hwm));
+ repSocket.setsockopt(ZMQ_SNDHWM, &hwm, sizeof(hwm));
+ repSocket.setsockopt(ZMQ_LINGER, &linger, sizeof(linger));
+ repSocket.bind(m_endpoint.c_str());
+
+ // create pollitem that polls the ZMQ sockets
+ zmq::pollitem_t pollItems[] = { {repSocket, 0, ZMQ_POLLIN, 0} };
+ while (m_active) {
+ zmq::poll(pollItems, 1, 100);
+ std::vector<std::string> msg;
+
+ if (pollItems[0].revents & ZMQ_POLLIN) {
+ recv_all(repSocket, msg);
+
+ std::string command((char*)msg[0].data(), msg[0].size());
+
+ if (msg.size() == 1 && command == "ping") {
+ send_ok_reply(repSocket);
+ }
+ else if (msg.size() == 1 && command == "list") {
+ size_t cohort_size = rcs.controllables.size();
+ for (auto &controllable : rcs.controllables) {
+ std::stringstream ss;
+ ss << "{ \"name\": \"" << controllable->get_rc_name() << "\"," <<
+ " \"params\": { ";
+
+ list< vector<string> > params = controllable->get_parameter_descriptions();
+ size_t i = 0;
+ for (auto &param : params) {
+ if (i > 0) {
+ ss << ", ";
+ }
+
+ ss << "\"" << param[0] << "\": " <<
+ "\"" << param[1] << "\"";
+
+ i++;
+ }
+
+ ss << " } }";
+
+ std::string msg_s = ss.str();
+
+ zmq::message_t zmsg(ss.str().size());
+ memcpy ((void*) zmsg.data(), msg_s.data(), msg_s.size());
+
+ int flag = (--cohort_size > 0) ? ZMQ_SNDMORE : 0;
+ repSocket.send(zmsg, flag);
+ }
+ }
+ else if (msg.size() == 2 && command == "show") {
+ std::string module((char*) msg[1].data(), msg[1].size());
+ try {
+ list< vector<string> > r = rcs.get_param_list_values(module);
+ size_t r_size = r.size();
+ for (auto &param_val : r) {
+ std::stringstream ss;
+ ss << param_val[0] << ": " << param_val[1] << endl;
+ zmq::message_t zmsg(ss.str().size());
+ memcpy(zmsg.data(), ss.str().data(), ss.str().size());
+
+ int flag = (--r_size > 0) ? ZMQ_SNDMORE : 0;
+ repSocket.send(zmsg, flag);
+ }
+ }
+ catch (const ParameterError &err) {
+ send_fail_reply(repSocket, err.what());
+ }
+ }
+ else if (msg.size() == 3 && command == "get") {
+ std::string module((char*) msg[1].data(), msg[1].size());
+ std::string parameter((char*) msg[2].data(), msg[2].size());
+
+ try {
+ std::string value = rcs.get_param(module, parameter);
+ zmq::message_t zmsg(value.size());
+ memcpy ((void*) zmsg.data(), value.data(), value.size());
+ repSocket.send(zmsg, 0);
+ }
+ catch (const ParameterError &err) {
+ send_fail_reply(repSocket, err.what());
+ }
+ }
+ else if (msg.size() == 4 && command == "set") {
+ std::string module((char*) msg[1].data(), msg[1].size());
+ std::string parameter((char*) msg[2].data(), msg[2].size());
+ std::string value((char*) msg[3].data(), msg[3].size());
+
+ try {
+ rcs.set_param(module, parameter, value);
+ send_ok_reply(repSocket);
+ }
+ catch (const ParameterError &err) {
+ send_fail_reply(repSocket, err.what());
+ }
+ }
+ else {
+ send_fail_reply(repSocket,
+ "Unsupported command. commands: list, show, get, set");
+ }
+ }
+ }
+ repSocket.close();
+ }
+ catch (const zmq::error_t &e) {
+ etiLog.level(error) << "ZMQ RC error: " << std::string(e.what());
+ }
+ catch (const std::exception& e) {
+ etiLog.level(error) << "ZMQ RC caught exception: " << e.what();
+ m_fault = true;
+ }
+}
+
+#endif
+
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