1 files changed, 174 insertions, 0 deletions
diff --git a/src/Log.h b/src/Log.h
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index 0000000..607735c
--- /dev/null
+++ b/src/Log.h
@@ -0,0 +1,174 @@
+/*
+   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
+   Her Majesty the Queen in Right of Canada (Communications Research
+   Center Canada)
+
+   Copyright (C), 2014, Matthias P. Braendli, matthias.braendli@mpb.li
+ */
+/*
+   This file is part of CRC-DADMOD.
+
+   CRC-DADMOD 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.
+
+   CRC-DADMOD 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 CRC-DADMOD.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _LOG_H
+#define _LOG_H
+
+#ifdef HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+#include <stdio.h>
+#include <syslog.h>
+#include <fstream>
+#include <sstream>
+#include <iostream>
+#include <list>
+#include <stdexcept>
+#include <string>
+
+#include "porting.h"
+
+#define SYSLOG_IDENT "CRC-DABMUX"
+#define SYSLOG_FACILITY LOG_LOCAL0
+
+extern Logger etiLog;
+
+enum log_level_t {debug = 0, info, warn, error, alert, emerg};
+
+/** Abstract class all backends must inherit from */
+class LogBackend {
+    public:
+        virtual void log(log_level_t level, std::string message) = 0;
+        virtual std::string get_name() = 0;
+};
+
+/** A Logging backend for Syslog */
+class LogToSyslog : public LogBackend {
+    public:
+        LogToSyslog() {
+            name = "SYSLOG";
+            openlog(SYSLOG_IDENT, LOG_PID, SYSLOG_FACILITY);
+        }
+
+        ~LogToSyslog() {
+            closelog();
+        }
+
+        void log(log_level_t level, std::string message) {
+
+            int syslog_level = LOG_EMERG;
+            switch (level) {
+                case debug: syslog_level = LOG_DEBUG; break;
+                case alert: syslog_level = LOG_ALERT; break;
+                case info:  syslog_level = LOG_INFO; break;
+                case warn:  syslog_level = LOG_WARNING; break;
+                case error: syslog_level = LOG_ERR; break;
+                case emerg: syslog_level = LOG_EMERG; break;
+            }
+
+            syslog(syslog_level, SYSLOG_IDENT " %s", message.c_str());
+        }
+
+        std::string get_name() { return name; };
+
+    private:
+        std::string name;
+};
+
+class LogToFile : public LogBackend {
+    public:
+        LogToFile(std::string filename) {
+            name = "FILE";
+
+            log_file = fopen(filename.c_str(), "a");
+            if (log_file == NULL) {
+                fprintf(stderr, "Cannot open log file !");
+                throw std::runtime_error("Cannot open log file !");
+            }
+        }
+
+        ~LogToFile() {
+            if (log_file != NULL) {
+                fclose(log_file);
+            }
+        }
+
+        void log(log_level_t level, std::string message) {
+
+            const char* log_level_text[] =
+                {"DEBUG", "INFO", "WARN", "ERROR", "ALERT", "EMERG"};
+
+            // fprintf is thread-safe
+            fprintf(log_file, "CRC-DABMOD: %s: %s\n",
+                    log_level_text[(size_t)level], message.c_str());
+            fflush(log_file);
+        }
+
+        std::string get_name() { return name; };
+
+    private:
+        std::string name;
+        FILE* log_file;
+};
+
+class LogLine;
+
+class Logger {
+    public:
+        Logger() {};
+
+        void register_backend(LogBackend* backend);
+
+        /* Log the message to all backends */
+        void log(log_level_t level, std::string message);
+
+        /* Return a LogLine for the given level */
+        LogLine level(log_level_t level);
+
+    private:
+        std::list<LogBackend*> backends;
+};
+
+// 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);
+        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) {
+            os << s;
+            return *this;
+        }
+
+        ~LogLine()
+        {
+            logger_->log(level_, os.str());
+        }
+
+    private:
+        std::ostringstream os;
+        log_level_t level_;
+        Logger* logger_;
+};
+
+
+#endif