/* Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications Research Center Canada) Copyright (C) 2014 Matthias P. Braendli http://mpb.li A TCP Socket server that serves state information and statistics for monitoring purposes. This server is very easy to integrate with munin http://munin-monitoring.org/ */ /* This file is part of ODR-DabMux. ODR-DabMux 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. ODR-DabMux 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 ODR-DabMux. If not, see . */ #include #include #include #include #include #include #include #include #include "StatsServer.h" #include "Log.h" void StatsServer::registerInput(std::string id) { boost::mutex::scoped_lock lock(m_mutex); if (m_inputStats.count(id) == 1) { etiLog.level(error) << "Double registration in Stats Server with id '" << id << "'"; return; } InputStat is; m_inputStats[id] = is; } void StatsServer::notifyBuffer(std::string id, long bufsize) { boost::mutex::scoped_lock lock(m_mutex); if (isInputRegistered(id)) m_inputStats[id].notifyBuffer(bufsize); } void StatsServer::notifyPeakLevels(std::string id, int peak_left, int peak_right) { boost::mutex::scoped_lock lock(m_mutex); if (isInputRegistered(id)) m_inputStats[id].notifyPeakLevels(peak_left, peak_right); } void StatsServer::notifyUnderrun(std::string id) { boost::mutex::scoped_lock lock(m_mutex); if (isInputRegistered(id)) m_inputStats[id].notifyUnderrun(); } void StatsServer::notifyOverrun(std::string id) { boost::mutex::scoped_lock lock(m_mutex); if (isInputRegistered(id)) m_inputStats[id].notifyOverrun(); } bool StatsServer::isInputRegistered(std::string& id) { if (m_inputStats.count(id) == 0) { etiLog.level(error) << "Stats Server id '" << id << "' does was not registered"; return false; } return true; } std::string StatsServer::getConfigJSON() { std::ostringstream ss; ss << "{ \"config\" : [\n"; std::map::iterator iter; int i = 0; for(iter = m_inputStats.begin(); iter != m_inputStats.end(); ++iter, i++) { std::string id = iter->first; if (i > 0) { ss << ", "; } ss << " \"" << id << "\" "; } ss << "] }\n"; return ss.str(); } std::string StatsServer::getValuesJSON() { std::ostringstream ss; ss << "{ \"values\" : {\n"; std::map::iterator iter; int i = 0; for(iter = m_inputStats.begin(); iter != m_inputStats.end(); ++iter, i++) { const std::string& id = iter->first; InputStat& stats = iter->second; if (i > 0) { ss << " ,\n"; } ss << " \"" << id << "\" : "; ss << stats.encodeValuesJSON(); stats.reset(); } ss << "}\n}\n"; return ss.str(); } std::string StatsServer::getStateJSON() { std::ostringstream ss; ss << "{\n"; std::map::iterator iter; int i = 0; for(iter = m_inputStats.begin(); iter != m_inputStats.end(); ++iter, i++) { const std::string& id = iter->first; InputStat& stats = iter->second; if (i > 0) { ss << " ,\n"; } ss << " \"" << id << "\" : "; ss << stats.encodeStateJSON(); stats.reset(); } ss << "}\n"; return ss.str(); } void StatsServer::restart() { m_restarter_thread = boost::thread(&StatsServer::restart_thread, this, 0); } // This runs in a separate thread, because // it would take too long to be done in the main loop // thread. void StatsServer::restart_thread(long) { m_running = false; if (m_listenport) { m_thread.interrupt(); m_thread.join(); } m_thread = boost::thread(&StatsServer::serverThread, this); } void StatsServer::serverThread() { m_fault = false; try { int accepted_sock; char buffer[256]; char welcome_msg[256]; struct sockaddr_in serv_addr, cli_addr; int n; int welcome_msg_len = snprintf(welcome_msg, 256, "{ \"service\": \"" "%s %s Stats Server\" }\n", PACKAGE_NAME, #if defined(GITVERSION) GITVERSION #else PACKAGE_VERSION #endif ); m_sock = socket(AF_INET, SOCK_STREAM, 0); if (m_sock < 0) { etiLog.level(error) << "Error opening Stats Server socket: " << strerror(errno); m_fault = true; return; } memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = INADDR_ANY; // TODO listen only on 127.0.0.1 serv_addr.sin_port = htons(m_listenport); if (bind(m_sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) { etiLog.level(error) << "Error binding Stats Server socket: " << strerror(errno); goto end_serverthread; } if (listen(m_sock, 5) < 0) { etiLog.level(error) << "Error listening on Stats Server socket: " << strerror(errno); goto end_serverthread; } m_running = true; while (m_running) { socklen_t cli_addr_len = sizeof(cli_addr); /* Accept actual connection from the client */ accepted_sock = accept(m_sock, (struct sockaddr *)&cli_addr, &cli_addr_len); if (accepted_sock < 0) { etiLog.level(warn) << "Stats Server cound not accept connection: " << strerror(errno); continue; } /* Send welcome message with version */ n = write(accepted_sock, welcome_msg, welcome_msg_len); if (n < 0) { etiLog.level(warn) << "Error writing to Stats Server socket " << strerror(errno); close(accepted_sock); continue; } /* receive command */ memset(buffer, 0, 256); int n = read(accepted_sock, buffer, 255); if (n < 0) { etiLog.level(warn) << "Error reading from Stats Server socket " << strerror(errno); close(accepted_sock); continue; } if (strcmp(buffer, "config\n") == 0) { boost::mutex::scoped_lock lock(m_mutex); std::string json = getConfigJSON(); n = write(accepted_sock, json.c_str(), json.size()); } else if (strcmp(buffer, "values\n") == 0) { boost::mutex::scoped_lock lock(m_mutex); std::string json = getValuesJSON(); n = write(accepted_sock, json.c_str(), json.size()); } else if (strcmp(buffer, "state\n") == 0) { boost::mutex::scoped_lock lock(m_mutex); std::string json = getStateJSON(); n = write(accepted_sock, json.c_str(), json.size()); } else { int len = snprintf(buffer, 256, "Invalid command\n"); n = write(accepted_sock, buffer, len); if (n < 0) { etiLog.level(warn) << "Error writing to Stats Server socket " << strerror(errno); } close(accepted_sock); continue; } close(accepted_sock); } end_serverthread: m_fault = true; close(m_sock); } catch (std::exception& e) { etiLog.level(error) << "Statistics server caught exception: " << e.what(); m_fault = true; } } std::string InputStat::encodeValuesJSON() { std::ostringstream ss; const int16_t int16_max = std::numeric_limits::max(); /* convert to dB */ int dB_l = peak_left ? round(20*log10((double)peak_left / int16_max)) : -90; int dB_r = peak_right ? round(20*log10((double)peak_right / int16_max)) : -90; ss << "{ \"inputstat\" : {" "\"min_fill\": " << min_fill_buffer << ", " "\"max_fill\": " << max_fill_buffer << ", " "\"peak_left\": " << dB_l << ", " "\"peak_right\": " << dB_r << ", " "\"num_underruns\": " << num_underruns << ", " "\"num_overruns\": " << num_overruns << " } }"; return ss.str(); } std::string InputStat::encodeStateJSON() { std::ostringstream ss; ss << "{ \"state\" : "; switch (determineState()) { case NoData: ss << "\"NoData\""; break; case Unstable: ss << "\"Unstable\""; break; case Streaming: ss << "\"Streaming\""; break; default: ss << "\"Unknown\""; } ss << " }"; return ss.str(); } input_state_t InputStat::determineState(void) { time_t now = time(NULL); input_state_t state; /* if the last event was more that INPUT_COUNTER_RESET_TIME * minutes ago, the timeout has expired. We can reset our * glitch counter. */ if (now - m_time_last_event > 60*INPUT_COUNTER_RESET_TIME) { m_glitch_counter = 0; } // STATE CALCULATION /* If the buffer has been empty for more than * INPUT_NODATA_TIMEOUT, we go to the NoData state. */ if (m_buffer_empty && now - m_time_last_buffer_nonempty > INPUT_NODATA_TIMEOUT) { state = NoData; } /* Otherwise, the state depends on the glitch counter */ else if (m_glitch_counter >= INPUT_UNSTABLE_THRESHOLD) { state = Unstable; } else { state = Streaming; } return state; }