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+/*
+ Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
+ Her Majesty the Queen in Right of Canada (Communications Research
+ Center Canada)
+
+ Copyright (C) 2018
+ Matthias P. Braendli, matthias.braendli@mpb.li
+
+ http://www.opendigitalradio.org
+ */
+/*
+ This file is part of the ODR-mmbTools.
+
+ 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 <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <syslog.h>
+#include <cstdarg>
+#include <cstdio>
+#include <fstream>
+#include <sstream>
+#include <iostream>
+#include <list>
+#include <stdexcept>
+#include <string>
+#include <map>
+#include <mutex>
+#include <memory>
+#include <thread>
+#include "ThreadsafeQueue.h"
+
+#define SYSLOG_IDENT PACKAGE_NAME
+#define SYSLOG_FACILITY LOG_LOCAL0
+
+enum log_level_t {debug = 0, info, warn, error, alert, emerg, trace, discard};
+
+static const std::string levels_as_str[] =
+ { " ", " ", "WARN ", "ERROR", "ALERT", "EMERG", "TRACE", "-----"} ;
+
+/** Abstract class all backends must inherit from */
+class LogBackend {
+ public:
+ virtual ~LogBackend() {};
+ virtual void log(log_level_t level, const std::string& message) = 0;
+ virtual std::string get_name() const = 0;
+};
+
+/** A Logging backend for Syslog */
+class LogToSyslog : public LogBackend {
+ public:
+ LogToSyslog() : name("SYSLOG") {
+ openlog(SYSLOG_IDENT, LOG_PID, SYSLOG_FACILITY);
+ }
+
+ virtual ~LogToSyslog() {
+ closelog();
+ }
+
+ void log(log_level_t level, const std::string& message);
+
+ std::string get_name() const { return name; }
+
+ private:
+ const std::string name;
+
+ LogToSyslog(const LogToSyslog& other) = delete;
+ const LogToSyslog& operator=(const LogToSyslog& other) = delete;
+};
+
+class LogToFile : public LogBackend {
+ public:
+ LogToFile(const std::string& filename);
+ void log(log_level_t level, const std::string& message);
+ std::string get_name() const { return name; }
+
+ private:
+ const std::string name;
+
+ struct FILEDeleter{ void operator()(FILE* fd){ if(fd) fclose(fd);}};
+ std::unique_ptr<FILE, FILEDeleter> log_file;
+
+ LogToFile(const LogToFile& other) = delete;
+ const LogToFile& operator=(const LogToFile& other) = delete;
+};
+
+class LogTracer : public LogBackend {
+ public:
+ LogTracer(const std::string& filename);
+ void log(log_level_t level, const std::string& message);
+ std::string get_name() const { return name; }
+ private:
+ std::string name;
+ uint64_t m_trace_micros_startup = 0;
+
+ struct FILEDeleter{ void operator()(FILE* fd){ if(fd) fclose(fd);}};
+ std::unique_ptr<FILE, FILEDeleter> m_trace_file;
+
+ LogTracer(const LogTracer& other) = delete;
+ const LogTracer& operator=(const LogTracer& other) = delete;
+};
+
+class LogLine;
+
+struct log_message_t {
+ log_message_t(log_level_t _level, std::string&& _message) :
+ level(_level),
+ message(move(_message)) {}
+
+ log_message_t() :
+ level(debug),
+ message("") {}
+
+ log_level_t level;
+ std::string message;
+};
+
+class Logger {
+ public:
+ Logger() {
+ m_io_thread = std::thread(&Logger::io_process, this);
+ }
+
+ Logger(const Logger& other) = delete;
+ const Logger& operator=(const Logger& other) = delete;
+ ~Logger() {
+ m_message_queue.trigger_wakeup();
+ m_io_thread.join();
+ }
+
+ void register_backend(std::shared_ptr<LogBackend> backend);
+
+ /* Log the message to all backends */
+ void log(log_level_t level, const char* fmt, ...);
+
+ void logstr(log_level_t level, std::string&& message);
+
+ /* All logging IO is done in another thread */
+ void io_process(void);
+
+ /* Return a LogLine for the given level
+ * so that you can write etiLog.level(info) << "stuff = " << 21 */
+ LogLine level(log_level_t level);
+
+ private:
+ std::list<std::shared_ptr<LogBackend> > backends;
+
+ ThreadsafeQueue<log_message_t> m_message_queue;
+ std::thread m_io_thread;
+ std::mutex m_cerr_mutex;
+};
+
+extern Logger etiLog;
+
+// Accumulate a line of logs, using same syntax as stringstream
+// The line is logged when the LogLine gets destroyed
+class LogLine {
+ public:
+ LogLine(const LogLine& logline);
+ const LogLine& operator=(const LogLine& other) = delete;
+ LogLine(Logger* logger, log_level_t level) :
+ logger_(logger)
+ {
+ level_ = level;
+ }
+
+ // Push the new element into the stringstream
+ template <typename T>
+ LogLine& operator<<(T s) {
+ if (level_ != discard) {
+ os << s;
+ }
+ return *this;
+ }
+
+ ~LogLine()
+ {
+ if (level_ != discard) {
+ logger_->logstr(level_, os.str());
+ }
+ }
+
+ private:
+ std::ostringstream os;
+ log_level_t level_;
+ Logger* logger_;
+};
+