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MEDIUM: stats: add abstract type to store counters

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Implement a small API to easily add extra counters inside a structure
instance. This will be used to implement dynamic statistics linked on
every type of object as needed.

The counters are stored in a dynamic array inside the relevant objects.
This commit is contained in:
Amaury Denoyelle 2020-10-05 11:49:41 +02:00 committed by Christopher Faulet
parent 58d395e0d6
commit 730c727ea3
1 changed files with 52 additions and 0 deletions
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52
include/haproxy/stats-t.h
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@ -479,6 +479,12 @@ struct stats_module {
uint32_t domain_flags; /* stats application domain for this module */
};
struct extra_counters {
char *data; /* heap containing counters allocated in a linear fashion */
size_t size; /* size of allocated data */
enum counters_type type; /* type of object containing the counters */
};
/* stats_domain is used in a flag as a 1 byte field */
enum stats_domain {
STATS_DOMAIN_PROXY = 0,
@ -497,4 +503,50 @@ enum stats_domain_px_cap {
STATS_PX_CAP_MASK = 0xff
};
#define EXTRA_COUNTERS(name) \
struct extra_counters *name
#define EXTRA_COUNTERS_GET(counters, mod) \
(void *)((counters)->data + (mod)->counters_off[(counters)->type])
#define EXTRA_COUNTERS_REGISTER(counters, ctype, alloc_failed_label) \
do { \
typeof(*counters) _ctr; \
_ctr = calloc(1, sizeof(*_ctr)); \
if (!_ctr) \
goto alloc_failed_label; \
_ctr->type = (ctype); \
*(counters) = _ctr; \
} while (0)
#define EXTRA_COUNTERS_ADD(mod, counters, new_counters, csize) \
do { \
typeof(counters) _ctr = (counters); \
(mod)->counters_off[_ctr->type] = _ctr->size; \
_ctr->size += (csize); \
} while (0)
#define EXTRA_COUNTERS_ALLOC(counters, alloc_failed_label) \
do { \
typeof(counters) _ctr = (counters); \
_ctr->data = malloc((_ctr)->size); \
if (!_ctr->data) \
goto alloc_failed_label; \
} while (0)
#define EXTRA_COUNTERS_INIT(counters, mod, init_counters, init_counters_size) \
do { \
typeof(counters) _ctr = (counters); \
memcpy(_ctr->data + mod->counters_off[_ctr->type], \
(init_counters), (init_counters_size)); \
} while (0)
#define EXTRA_COUNTERS_FREE(counters) \
do { \
if (counters) { \
free((counters)->data); \
free(counters); \
} \
} while (0)
#endif /* _HAPROXY_STATS_T_H */