Add logger object to be able to support multiple logging backends

other/bootstrap_daemon/src/global.h

@@ -0,0 +1,30 @@
+/* global.h
+ *
+ * Tox DHT bootstrap daemon.
+ *
+ *  Copyright (C) 2015 Tox project All Rights Reserved.
+ *
+ *  This file is part of Tox.
+ *
+ *  Tox 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.
+ *
+ *  Tox 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 Tox.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GLOBAL_H
+#define GLOBAL_H
+
+#define DAEMON_NAME "tox-bootstrapd"
+#define DAEMON_VERSION_NUMBER 2014101200UL // yyyymmmddvv format: yyyy year, mm month, dd day, vv version change count for that day
+
+#endif // GLOBAL_H

other/bootstrap_daemon/src/logger.c

@@ -0,0 +1,112 @@
+/* logger.c
+ *
+ * Tox DHT bootstrap daemon.
+ *
+ *  Copyright (C) 2015 Tox project All Rights Reserved.
+ *
+ *  This file is part of Tox.
+ *
+ *  Tox 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.
+ *
+ *  Tox 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 Tox.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "logger.h"
+
+#include "global.h"
+
+#include <syslog.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+
+typedef struct Logger {
+    LOGGER_BACKEND backend;
+} Logger;
+
+Logger* new_logger(LOGGER_BACKEND backend)
+{
+    if (backend == LOGGER_BACKEND_SYSLOG) {
+        openlog(DAEMON_NAME, LOG_NOWAIT | LOG_PID, LOG_DAEMON);
+    }
+
+    Logger* logger = malloc(sizeof(Logger));
+
+    if (logger == NULL) {
+        return NULL;
+    }
+
+    logger->backend = backend;
+
+    return logger;
+}
+
+void kill_logger(Logger* logger)
+{
+    if (backend == LOGGER_BACKEND_SYSLOG) {
+        closelog();
+    }
+
+    free(logger);
+}
+
+int level_syslog(LOG_LEVEL level)
+{
+    switch (level) {
+        case LOG_LEVEL_INFO:
+            return LOG_INFO;
+        case LOG_LEVEL_WARNING:
+            return LOG_WARNING;
+        case LOG_LEVEL_ERROR:
+            return LOG_ERR;
+    }
+}
+
+void log_syslog(LOG_LEVEL level, const char *format, va_list args)
+{
+    vsyslog(level_syslog(level), format, args);
+}
+
+FILE* level_stdout(LOG_LEVEL level)
+{
+    switch (level) {
+        case LOG_LEVEL_INFO:
+            return stdout;
+        case LOG_LEVEL_WARNING: // intentional fallthrough
+        case LOG_LEVEL_ERROR:
+            return stderr;
+
+    }
+}
+
+void log_stdout(LOG_LEVEL level, const char *format, va_list args)
+{
+    vfprintf(level_stdout(level), format, args);
+}
+
+void log(Logger* logger, LOG_LEVEL level, const char *format, ...)
+{
+    va_list args;
+    va_start(args, format);
+
+    switch (logger->backend) {
+        case LOGGER_BACKEND_SYSLOG:
+            log_syslog(level, format, args);
+            break;
+        case LOGGER_BACKEND_STDOUT:
+            log_stdout(level, format, args);
+            break;
+    }
+
+    va_end(args);
+}

other/bootstrap_daemon/src/logger.h

@@ -0,0 +1,63 @@
+/* logger.h
+ *
+ * Tox DHT bootstrap daemon.
+ *
+ *  Copyright (C) 2015 Tox project All Rights Reserved.
+ *
+ *  This file is part of Tox.
+ *
+ *  Tox 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.
+ *
+ *  Tox 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 Tox.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef LOGGER_H
+#define LOGGER_H
+
+typedef enum LOGGER_BACKEND {
+    LOGGER_BACKEND_SYSLOG,
+    LOGGER_BACKEND_STDOUT
+} LOGGER_BACKEND;
+
+typedef enum LOG_LEVEL {
+    LOG_LEVEL_INFO,
+    LOG_LEVEL_WARNING,
+    LOG_LEVEL_ERROR
+} LOG_LEVEL;
+
+typedef struct Logger Logger;
+
+/**
+ * Creates new logger.
+ * @param backend Specifies which backend the logger should use.
+ * @return Logger object on success, NULL on failure.
+ */
+Logger* new_logger(LOGGER_BACKEND backend);
+
+/**
+ * Destroys a logger object, releasing all used resources.
+ * @param logger Logger object to destroy.
+ */
+void kill_logger(Logger* logger);
+
+/**
+ * Logs a message.
+ * @param logger Logger object to use.
+ * @param level Log level to use.
+ * @param format printf-like format string.
+ * @param ... Zero or more arguments, similar to printf function.
+ */
+void log(Logger* logger, LOG_LEVEL level, const char *format, ...);
+
+
+#endif // LOGGER_H