crc-dabmod: added syslog support

1 files changed, 143 insertions, 0 deletions

diff --git a/src/Log.h b/src/Log.h
new file mode 100644
index 0000000..dc686fc
--- /dev/null
+++ b/src/Log.h
@@ -0,0 +1,143 @@
+/*
+   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
+   Her Majesty the Queen in Right of Canada (Communications Research
+   Center Canada)
+
+   Includes modifications for which no copyright is claimed
+   2012, 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 <string>
+#include <syslog.h>
+#include <iostream>
+#include <fstream>
+#include <list>
+#include <stdexcept>
+
+#include <stdarg.h>
+
+#include "porting.h"
+
+#define SYSLOG_IDENT "CRC-DABMOD"
+#define SYSLOG_FACILITY LOG_LOCAL0
+
+enum log_level_t {debug = 0, info, warn, error, alert, emerg};
+
+class LogBackend {
+    public:
+        virtual void log(log_level_t level, const char* fmt, ...) = 0;
+        virtual std::string get_name() = 0;
+};
+
+class LogToSyslog : public LogBackend {
+    public:
+        LogToSyslog() {
+            name = "SYSLOG";
+            openlog(SYSLOG_IDENT, LOG_PID, SYSLOG_FACILITY);
+        }
+
+        ~LogToSyslog() {
+            closelog();
+        }
+
+        void log(log_level_t level, const char* fmt, ...) {
+            va_list arg_ptr;
+
+            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;
+            }
+ 
+            va_start(arg_ptr, fmt);
+            syslog(level, fmt, arg_ptr);
+            va_end(arg_ptr);
+        }
+
+        std::string get_name() { return name; };
+
+    private:
+        std::string name;
+};
+
+class LogToFile : public LogBackend {
+    public:
+        LogToFile(std::string filename) {
+            name = "FILE";
+            log_filename = filename;
+            log_stream.open(filename.c_str(), std::ios::app);
+            if (!log_stream.is_open()) {
+                throw new std::runtime_error("Cannot open log file !");
+            }
+        }
+
+        ~LogToFile() {
+            if (log_stream.is_open()) {
+                log_stream.close();
+            }
+        }
+
+        void log(log_level_t level, const char* fmt, ...) {
+            va_list arg_ptr;
+            char message[200];
+
+            const char* log_level_text[] = {"DEBUG", "INFO", "WARN", "ERROR", "ALERT", "EMERG"};
+
+            va_start(arg_ptr, fmt);
+            snprintf(message, 200, fmt, arg_ptr);
+            log_stream << "CRC-DABMOD: " << log_level_text[(size_t)level] << ": " << message << std::endl;
+            va_end(arg_ptr);
+        }
+
+        std::string get_name() { return name; };
+
+    private:
+        std::string name;
+        std::string log_filename;
+        std::ofstream log_stream;
+};
+
+class Logger {
+    public:
+        Logger();
+
+        void register_backend(LogBackend* backend);
+
+        void log(log_level_t level, std::string message) { operator()(level, "%s", message.c_str()); }
+        void log(log_level_t level, const char* fmt, ...);
+
+        void operator()(log_level_t level, const char* fmt, ...);
+
+    private:
+        std::list<LogBackend*> backends;
+};
+
+
+#endif