Ben Pfaff
159 lines
6.2 KiB
C
159 lines
6.2 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#ifndef VLOG_H
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#define VLOG_H 1
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#include <limits.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <time.h>
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#include "util.h"
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/* Logging importance levels. */
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enum vlog_level {
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VLL_EMER,
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VLL_ERR,
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VLL_WARN,
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VLL_DBG,
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VLL_N_LEVELS
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};
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const char *vlog_get_level_name(enum vlog_level);
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enum vlog_level vlog_get_level_val(const char *name);
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/* Facilities that we can log to. */
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enum vlog_facility {
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VLF_SYSLOG,
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VLF_CONSOLE,
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VLF_N_FACILITIES,
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VLF_ANY_FACILITY = -1
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};
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const char *vlog_get_facility_name(enum vlog_facility);
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enum vlog_facility vlog_get_facility_val(const char *name);
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/* VLM_ constant for each vlog module. */
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enum vlog_module {
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#define VLOG_MODULE(NAME) VLM_##NAME,
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#include "vlog-modules.def"
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VLM_N_MODULES,
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VLM_ANY_MODULE = -1
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};
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const char *vlog_get_module_name(enum vlog_module);
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enum vlog_module vlog_get_module_val(const char *name);
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/* Rate-limiter for log messages. */
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struct vlog_rate_limit {
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/* Configuration settings. */
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unsigned int rate; /* Tokens per second. */
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unsigned int burst; /* Max cumulative tokens credit. */
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/* Current status. */
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unsigned int tokens; /* Current number of tokens. */
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time_t last_fill; /* Last time tokens added. */
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time_t first_dropped; /* Time first message was dropped. */
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unsigned int n_dropped; /* Number of messages dropped. */
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};
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/* Number of tokens to emit a message. We add 'rate' token per second, which
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* is 60 times the unit used for 'rate', thus 60 tokens are required to emit
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* one message. */
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#define VLOG_MSG_TOKENS 60
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/* Initializer for a struct vlog_rate_limit, to set up a maximum rate of RATE
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* messages per minute and a maximum burst size of BURST messages. */
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#define VLOG_RATE_LIMIT_INIT(RATE, BURST) \
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{ \
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RATE, /* rate */ \
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(MIN(BURST, UINT_MAX / VLOG_MSG_TOKENS) \
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* VLOG_MSG_TOKENS), /* burst */ \
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0, /* tokens */ \
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0, /* last_fill */ \
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0, /* n_dropped */ \
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}
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/* Configuring how each module logs messages. */
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enum vlog_level vlog_get_level(enum vlog_module, enum vlog_facility);
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void vlog_set_levels(enum vlog_module, enum vlog_facility, enum vlog_level);
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char *vlog_set_levels_from_string(const char *);
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char *vlog_get_levels(void);
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bool vlog_is_enabled(enum vlog_module, enum vlog_level);
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void vlog_set_verbosity(const char *arg);
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/* Function for actual logging. */
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void vlog_init(void);
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void vlog_exit(void);
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void vlog(enum vlog_module, enum vlog_level, const char *format, ...)
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__attribute__((format(printf, 3, 4)));
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void vlog_valist(enum vlog_module, enum vlog_level, const char *, va_list)
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__attribute__((format(printf, 3, 0)));
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void vlog_rate_limit(enum vlog_module, enum vlog_level,
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struct vlog_rate_limit *, const char *, ...)
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__attribute__((format(printf, 4, 5)));
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/* Convenience macros. To use these, define THIS_MODULE as a macro that
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* expands to the module used by the current source file, e.g.
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* #include "vlog.h"
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* #define THIS_MODULE VLM_netlink
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* Guaranteed to preserve errno.
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*/
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#define VLOG_EMER(...) vlog(THIS_MODULE, VLL_EMER, __VA_ARGS__)
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#define VLOG_ERR(...) vlog(THIS_MODULE, VLL_ERR, __VA_ARGS__)
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#define VLOG_WARN(...) vlog(THIS_MODULE, VLL_WARN, __VA_ARGS__)
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#define VLOG_DBG(...) vlog(THIS_MODULE, VLL_DBG, __VA_ARGS__)
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/* More convenience macros, for testing whether a given level is enabled in
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* THIS_MODULE. When constructing a log message is expensive, this enables it
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* to be skipped. */
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#define VLOG_IS_EMER_ENABLED() true
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#define VLOG_IS_ERR_ENABLED() vlog_is_enabled(THIS_MODULE, VLL_EMER)
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#define VLOG_IS_WARN_ENABLED() vlog_is_enabled(THIS_MODULE, VLL_WARN)
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#define VLOG_IS_DBG_ENABLED() vlog_is_enabled(THIS_MODULE, VLL_DBG)
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/* Convenience macros. To use these, define THIS_MODULE as a macro that
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* expands to the module used by the current source file, e.g.
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* #include "vlog.h"
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* #define THIS_MODULE VLM_netlink
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* Guaranteed to preserve errno.
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*/
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#define VLOG_ERR_RL(RL, ...) \
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vlog_rate_limit(THIS_MODULE, VLL_ERR, RL, __VA_ARGS__)
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#define VLOG_WARN_RL(RL, ...) \
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vlog_rate_limit(THIS_MODULE, VLL_WARN, RL, __VA_ARGS__)
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#define VLOG_DBG_RL(RL, ...) \
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vlog_rate_limit(THIS_MODULE, VLL_DBG, RL, __VA_ARGS__)
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#endif /* vlog.h */
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