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bf05a014db
Added the "instrument" keyword to otel-scope sections for recording metric measurements alongside traces. Introduced flt_otel_conf_instrument holding instrument type, description, unit, sample expressions, and optional key-value attributes. The supported synchronous integer-precision instrument types were counters, histograms, up-down counters, and gauges. Instruments followed a two-form design: a "create" form defined a new instrument with its type and value expression, while an "update" form recorded measurements against an existing instrument with per-scope attributes. Instrument creation was performed lazily at first use with HA_ATOMIC_CAS to guarantee thread-safe one-time initialization. The configuration check phase validated that every update-form had a matching create-form definition and that create-form names were unique across all scopes. The meter lifecycle was integrated into filter init and deinit, starting the meter alongside the tracer and shutting it down during cleanup.
99 lines
4.5 KiB
C
99 lines
4.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#ifndef _OTEL_DEFINE_H_
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#define _OTEL_DEFINE_H_
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/* Safe pointer dereference with default value. */
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#define FLT_OTEL_DEREF(p,m,v) (((p) != NULL) ? (p)->m : (v))
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/* Check whether argument at index n is in range, non-NULL and non-empty. */
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#define FLT_OTEL_ARG_ISVALID(n) ({ typeof(n) _n = (n); OTELC_IN_RANGE(_n, 0, MAX_LINE_ARGS - 1) && (args[_n] != NULL) && (*args[_n] != '\0'); })
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/* Convert a uint32_t rate value to a floating-point percentage. */
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#define FLT_OTEL_U32_FLOAT(a) ((a) * 100.0 / UINT32_MAX)
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/* Convert a floating-point percentage to a uint32_t rate value. */
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#define FLT_OTEL_FLOAT_U32(a) ((uint32_t)((a) / 100.0 * UINT32_MAX + 0.5))
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#define FLT_OTEL_STR_DASH_72 "------------------------------------------------------------------------"
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#define FLT_OTEL_STR_DASH_78 FLT_OTEL_STR_DASH_72 "------"
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#define FLT_OTEL_STR_FLAG_YN(a) ((a) ? "yes" : "no")
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/* Compile-time string length excluding the null terminator. */
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#define FLT_OTEL_STR_SIZE(a) (sizeof(a) - 1)
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/* Expand to address and length pair for a string literal. */
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#define FLT_OTEL_STR_ADDRSIZE(a) (a), FLT_OTEL_STR_SIZE(a)
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/* Compare a runtime string against a compile-time string literal. */
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#define FLT_OTEL_STR_CMP(S,s) ((s##_len == FLT_OTEL_STR_SIZE(S)) && (memcmp((s), FLT_OTEL_STR_ADDRSIZE(S)) == 0))
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/* Tolerance for double comparison in flt_otel_qsort_compar_double(). */
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#define FLT_OTEL_DBL_EPSILON 1e-9
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/* Execute a statement exactly once across all invocations. */
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#define FLT_OTEL_RUN_ONCE(f) do { static bool _f = 1; if (_f) { _f = 0; { f; } } } while (0)
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/* Check whether a list head has been initialized. */
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#define FLT_OTEL_LIST_ISVALID(a) ({ typeof(a) _a = (a); (_a != NULL) && (_a->n != NULL) && (_a->p != NULL); })
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/* Safely delete a list element if its list head is valid. */
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#define FLT_OTEL_LIST_DEL(a) do { if (FLT_OTEL_LIST_ISVALID(a)) LIST_DELETE(a); } while (0)
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/* Destroy all elements in a typed configuration list. */
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#define FLT_OTEL_LIST_DESTROY(t,h) \
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do { \
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struct flt_otel_conf_##t *_ptr, *_back; \
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\
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if (!FLT_OTEL_LIST_ISVALID(h) || LIST_ISEMPTY(h)) \
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break; \
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\
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OTELC_DBG(NOTICE, "- deleting " #t " list %s", flt_otel_list_dump(h)); \
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\
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list_for_each_entry_safe(_ptr, _back, (h), list) \
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flt_otel_conf_##t##_free(&_ptr); \
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} while (0)
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/* Declare a rotating thread-local string buffer pool. */
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#define FLT_OTEL_BUFFER_THR(b,m,n,p) \
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static THREAD_LOCAL char b[m][n]; \
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static THREAD_LOCAL size_t __idx = 0; \
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char *p = b[__idx]; \
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__idx = (__idx + 1) % (m)
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/* Format an error message if none has been set yet. */
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#define FLT_OTEL_ERR(f, ...) \
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do { \
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if ((err != NULL) && (*err == NULL)) { \
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(void)memprintf(err, f, ##__VA_ARGS__); \
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\
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OTELC_DBG(DEBUG, "err: '%s'", *err); \
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} \
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} while (0)
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/* Append to an existing error message unconditionally. */
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#define FLT_OTEL_ERR_APPEND(f, ...) \
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do { \
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if (err != NULL) \
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(void)memprintf(err, f, ##__VA_ARGS__); \
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} while (0)
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/* Log an error message and free its memory. */
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#define FLT_OTEL_ERR_FREE(p) \
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do { \
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if ((p) == NULL) \
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break; \
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\
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OTELC_DBG(LOG, "%s:%d: ERROR: %s", __func__, __LINE__, (p)); \
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OTELC_SFREE_CLEAR(p); \
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} while (0)
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#endif /* _OTEL_DEFINE_H_ */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*
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* vi: noexpandtab shiftwidth=8 tabstop=8
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*/
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