Add logging support

Logging functions are borrowed from Cynara:
https://github.com/Samsung/cynara

Change-Id: I76752bc54085b08567c0f615be2ee9948d30f18c

diff --git a/src/Log/log.cpp b/src/Log/log.cpp
new file mode 100644 (file)
index 0000000..76e95b5
--- /dev/null
+++ b/src/Log/log.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * Contact: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+/**
+ * @file        src/Log/log.cpp
+ * @author      Adam Malinowski <a.malinowsk2@partner.samsung.com>
+ * @version     1.0
+ * @brief       Simple file containing definition of logging level variable.
+ */
+
+#include "log.h"
+
+#include <cstring>
+#include <stdlib.h>
+
+#ifdef BUILD_TYPE_DEBUG
+int __log_level = LOG_DEBUG;
+#else
+int __log_level = LOG_ERR;
+#endif
+
+static int strlog2intlog(const char *strlog) {
+    if(!strncmp("LOG_EMERG", strlog, strlen("LOG_EMERG")))
+        return LOG_EMERG;
+    if(!strncmp("LOG_ALERT", strlog, strlen("LOG_ALERT")))
+        return LOG_ALERT;
+    if(!strncmp("LOG_CRIT", strlog, strlen("LOG_CRIT")))
+        return LOG_CRIT;
+    if(!strncmp("LOG_ERR", strlog, strlen("LOG_ERR")))
+        return LOG_ERR;
+    if(!strncmp("LOG_WARNING", strlog, strlen("LOG_WARNING")))
+        return LOG_WARNING;
+    if(!strncmp("LOG_NOTICE", strlog, strlen("LOG_NOTICE")))
+        return LOG_NOTICE;
+    if(!strncmp("LOG_INFO", strlog, strlen("LOG_INFO")))
+        return LOG_INFO;
+    if(!strncmp("LOG_DEBUG", strlog, strlen("LOG_DEBUG")))
+        return LOG_DEBUG;
+
+    return LOG_ERR;
+}
+
+void init_log(void) {
+    char *env_val = getenv("LAD_LOG_LEVEL");
+    if (env_val) {
+        __log_level = strlog2intlog(env_val);
+    }
+}

diff --git a/src/Log/log.h b/src/Log/log.h
new file mode 100644 (file)
index 0000000..2348f82
--- /dev/null
+++ b/src/Log/log.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ *  Contact: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/**
+ * @file        src/Log/log.h
+ * @author      Adam Malinowski <a.malinowsk2@partner.samsung.com>
+ * @author      Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
+ * @version     1.0
+ * @brief       This file defines logging utilities.
+ */
+
+#ifndef SRC_LOG_LOG_H
+#define SRC_LOG_LOG_H
+
+#ifndef LAD_NO_LOGS
+#include <sstream>
+#ifdef WITH_JOURNALD
+#include <systemd/sd-journal.h>
+#else // WITH_JOURNALD
+#include <syslog.h>
+#endif // WITH_JOURNALD
+#endif // LAD_NO_LOGS
+
+#define UNUSED __attribute__((unused))
+
+extern int __log_level;
+
+#ifndef LAD_NO_LOGS
+namespace {
+    template <typename ...Args>
+    void UNUSED __LOG_FUN(int level, const std::stringstream &format, Args&&... args) {
+#ifdef WITH_JOURNALD
+        sd_journal_print(level, format.str().c_str(), std::forward<Args>(args)...);
+#else // WITH_JOURNALD
+        syslog(level, format.str().c_str(), std::forward<Args>(args)...);
+#endif // WITH_JOURNALD
+    }
+
+    template <>
+    void UNUSED __LOG_FUN(int level, const std::stringstream &format) {
+#ifdef WITH_JOURNALD
+        sd_journal_print(level, "%s", format.str().c_str());
+#else // WITH_JOURNALD
+        syslog(level, "%s", format.str().c_str());
+#endif // WITH_JOURNALD
+    }
+} // namespace anonymous
+
+    #define __LOG(LEVEL, FORMAT, ...) \
+        do { \
+            if (LEVEL <= __log_level) { \
+                std::stringstream __LOG_FORMAT; \
+                __LOG_FORMAT << FORMAT; \
+                __LOG_FUN(LEVEL, __LOG_FORMAT, ##__VA_ARGS__); \
+            } \
+        } while (0)
+
+#else // LAD_NO_LOGS
+    #define __LOG(LEVEL, ...)
+#endif
+
+#define LOGM(...)  __LOG(LOG_EMERG, __VA_ARGS__)   /* system is unusable */
+#define LOGA(...)  __LOG(LOG_ALERT, __VA_ARGS__)   /* action must be taken immediately */
+#define LOGC(...)  __LOG(LOG_CRIT, __VA_ARGS__)    /* critical conditions */
+#define LOGE(...)  __LOG(LOG_ERR, __VA_ARGS__)     /* error conditions */
+#define LOGW(...)  __LOG(LOG_WARNING, __VA_ARGS__) /* warning conditions */
+#define LOGN(...)  __LOG(LOG_NOTICE, __VA_ARGS__)  /* normal but significant condition */
+#define LOGI(...)  __LOG(LOG_INFO, __VA_ARGS__)    /* informational */
+#define LOGD(...)  __LOG(LOG_DEBUG, __VA_ARGS__)   /* debug-level messages */
+
+void init_log(void);
+
+#endif /* SRC_LOG_LOG_H */