MEDIUM: stats: add abstract type to store counters
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.
diff --git a/include/haproxy/stats-t.h b/include/haproxy/stats-t.h
index 7d41b78..3be2b4a 100644
--- a/include/haproxy/stats-t.h
+++ b/include/haproxy/stats-t.h
@@ -479,6 +479,12 @@
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 @@
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 */