log.h

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/* Simple Plugin API
 *
 * Copyright © 2018 Wim Taymans
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef SPA_LOG_H
#define SPA_LOG_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdarg.h>
 
#include <spa/utils/type.h>
#include <spa/utils/defs.h>
#include <spa/utils/hook.h>
 
#define SPA_LOG_TOPIC_DEFAULT NULL
 
enum spa_log_level {
        SPA_LOG_LEVEL_NONE = 0,
        SPA_LOG_LEVEL_ERROR,
        SPA_LOG_LEVEL_WARN,
        SPA_LOG_LEVEL_INFO,
        SPA_LOG_LEVEL_DEBUG,
        SPA_LOG_LEVEL_TRACE,
};
 
#define SPA_TYPE_INTERFACE_Log  SPA_TYPE_INFO_INTERFACE_BASE "Log"
 
 
struct spa_log {
#define SPA_VERSION_LOG         0
        struct spa_interface iface;
        enum spa_log_level level;
};
 
struct spa_log_topic {
#define SPA_VERSION_LOG_TOPIC   0
        uint32_t version;
        const char *topic;
        enum spa_log_level level;
        bool has_custom_level;
};
 
struct spa_log_methods {
#define SPA_VERSION_LOG_METHODS         1
        uint32_t version;
        void (*log) (void *object,
                     enum spa_log_level level,
                     const char *file,
                     int line,
                     const char *func,
                     const char *fmt, ...) SPA_PRINTF_FUNC(6, 7);
 
        void (*logv) (void *object,
                      enum spa_log_level level,
                      const char *file,
                      int line,
                      const char *func,
                      const char *fmt,
                      va_list args) SPA_PRINTF_FUNC(6, 0);
        void (*logt) (void *object,
                     enum spa_log_level level,
                     const struct spa_log_topic *topic,
                     const char *file,
                     int line,
                     const char *func,
                     const char *fmt, ...) SPA_PRINTF_FUNC(7, 8);
 
        void (*logtv) (void *object,
                      enum spa_log_level level,
                      const struct spa_log_topic *topic,
                      const char *file,
                      int line,
                      const char *func,
                      const char *fmt,
                      va_list args) SPA_PRINTF_FUNC(7, 0);
 
        void (*topic_init) (void *object, struct spa_log_topic *topic);
};
 
 
#define SPA_LOG_TOPIC(v, t) \
   (struct spa_log_topic){ .version = v, .topic = (t)}
 
#define spa_log_topic_init(l, topic)                            \
do {                                                            \
        struct spa_log *_l = l;                                 \
        if (SPA_LIKELY(_l)) {                                   \
                struct spa_interface *_if = &_l->iface;         \
                spa_interface_call(_if, struct spa_log_methods, \
                                topic_init, 1, topic);          \
        }                                                       \
} while(0)
 
/* Unused, left for backwards compat */
#define spa_log_level_enabled(l,lev) ((l) && (l)->level >= (lev))
 
#define spa_log_level_topic_enabled(l,topic,lev)                \
({                                                              \
        struct spa_log *_log = l;                               \
        enum spa_log_level _lev = _log ? _log->level : SPA_LOG_LEVEL_NONE;              \
        struct spa_log_topic *_t = (struct spa_log_topic *)topic; \
        if (_t && _t->has_custom_level)                                                 \
                _lev = _t->level;                               \
        _lev >= lev;                                            \
})
 
/* Transparently calls to version 0 log if v1 is not supported */
#define spa_log_logt(l,lev,topic,...)                                   \
({                                                                      \
        struct spa_log *_l = l;                                         \
        struct spa_interface *_if = &_l->iface;                         \
        if (SPA_UNLIKELY(spa_log_level_topic_enabled(_l, topic, lev))) { \
                if (!spa_interface_call(_if,                            \
                                struct spa_log_methods, logt, 1,        \
                                lev, topic,                             \
                                __VA_ARGS__))                           \
                    spa_interface_call(_if,                             \
                                struct spa_log_methods, log, 0,         \
                                lev, __VA_ARGS__);                      \
        }                                                               \
})
 
/* Transparently calls to version 0 logv if v1 is not supported */
#define spa_log_logtv(l,lev,topic,...)                                  \
({                                                                      \
        struct spa_log *_l = l;                                         \
        struct spa_interface *_if = &_l->iface;                         \
        if (SPA_UNLIKELY(spa_log_level_topic_enabled(_l, topic, lev))) { \
                if (!spa_interface_call(_if,                            \
                                struct spa_log_methods, logtv, 1,       \
                                lev, topic,                             \
                                __VA_ARGS__))                           \
                    spa_interface_call(_if,                             \
                                struct spa_log_methods, logv, 0,        \
                                lev, __VA_ARGS__);                      \
        }                                                               \
})
 
#define spa_log_log(l,lev,...)                                  \
        spa_log_logt(l,lev,SPA_LOG_TOPIC_DEFAULT,__VA_ARGS__)
 
#define spa_log_logv(l,lev,...)                                 \
        spa_log_logtv(l,lev,SPA_LOG_TOPIC_DEFAULT,__VA_ARGS__)
 
#define spa_log_error(l,...)    spa_log_log(l,SPA_LOG_LEVEL_ERROR,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_log_warn(l,...)     spa_log_log(l,SPA_LOG_LEVEL_WARN,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_log_info(l,...)     spa_log_log(l,SPA_LOG_LEVEL_INFO,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_log_debug(l,...)    spa_log_log(l,SPA_LOG_LEVEL_DEBUG,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_log_trace(l,...)    spa_log_log(l,SPA_LOG_LEVEL_TRACE,__FILE__,__LINE__,__func__,__VA_ARGS__)
 
#define spa_logt_error(l,t,...) spa_log_logt(l,SPA_LOG_LEVEL_ERROR,t,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_logt_warn(l,t,...)  spa_log_logt(l,SPA_LOG_LEVEL_WARN,t,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_logt_info(l,t,...)  spa_log_logt(l,SPA_LOG_LEVEL_INFO,t,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_logt_debug(l,t,...) spa_log_logt(l,SPA_LOG_LEVEL_DEBUG,t,__FILE__,__LINE__,__func__,__VA_ARGS__)
#define spa_logt_trace(l,t,...) spa_log_logt(l,SPA_LOG_LEVEL_TRACE,t,__FILE__,__LINE__,__func__,__VA_ARGS__)
 
#ifndef FASTPATH
#define spa_log_trace_fp(l,...) spa_log_log(l,SPA_LOG_LEVEL_TRACE,__FILE__,__LINE__,__func__,__VA_ARGS__)
#else
#define spa_log_trace_fp(l,...)
#endif
 
#define SPA_KEY_LOG_LEVEL               "log.level"             
#define SPA_KEY_LOG_COLORS              "log.colors"            
#define SPA_KEY_LOG_FILE                "log.file"              
#define SPA_KEY_LOG_TIMESTAMP           "log.timestamp"         
#define SPA_KEY_LOG_LINE                "log.line"              
#define SPA_KEY_LOG_PATTERNS            "log.patterns"          
#ifdef __cplusplus
}  /* extern "C" */
#endif
#endif /* SPA_LOG_H */