logger changes from global static variables to one instance per stellar

include/stellar/log.h

@@ -0,0 +1,62 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+enum log_level
+{
+    LOG_TRACE,
+    LOG_DEBUG,
+    LOG_INFO,
+    LOG_WARN,
+    LOG_ERROR,
+    LOG_FATAL,
+};
+
+#define STELLAR_LOG_TRACE(logger, module, format, ...)                     \
+    if ((logger) && log_level_check((logger), LOG_TRACE))                  \
+    {                                                                      \
+        log_print((logger), LOG_TRACE, (module), (format), ##__VA_ARGS__); \
+    }
+
+#define STELLAR_LOG_DEBUG(logger, module, format, ...)                     \
+    if ((logger) && log_level_check((logger), LOG_DEBUG))                  \
+    {                                                                      \
+        log_print((logger), LOG_DEBUG, (module), (format), ##__VA_ARGS__); \
+    }
+
+#define STELLAR_LOG_INFO(logger, module, format, ...)                     \
+    if ((logger) && log_level_check((logger), LOG_INFO))                  \
+    {                                                                     \
+        log_print((logger), LOG_INFO, (module), (format), ##__VA_ARGS__); \
+    }
+
+#define STELLAR_LOG_WARN(logger, module, format, ...)                     \
+    if ((logger) && log_level_check((logger), LOG_WARN))                  \
+    {                                                                     \
+        log_print((logger), LOG_WARN, (module), (format), ##__VA_ARGS__); \
+    }
+
+#define STELLAR_LOG_ERROR(logger, module, format, ...)                     \
+    if ((logger) && log_level_check((logger), LOG_ERROR))                  \
+    {                                                                      \
+        log_print((logger), LOG_ERROR, (module), (format), ##__VA_ARGS__); \
+    }
+
+#define STELLAR_LOG_FATAL(logger, module, format, ...)                     \
+    if ((logger) && log_level_check((logger), LOG_FATAL))                  \
+    {                                                                      \
+        log_print((logger), LOG_FATAL, (module), (format), ##__VA_ARGS__); \
+    }
+
+struct logger;
+struct logger *stellar_get_logger(struct stellar *st);
+
+int log_level_check(struct logger *logger, enum log_level level);
+void log_print(struct logger *logger, enum log_level level, const char *module, const char *fmt, ...);
+
+#ifdef __cplusplus
+}
+#endif