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8126fd569b
Added the configuration structures that model the OTel filter's instrumentation hierarchy and the utility functions that support the configuration parser. The configuration is organized as a tree rooted at flt_otel_conf, which holds the proxy reference, filter identity, and lists of groups and scopes. Below it, flt_otel_conf_instr carries the instrumentation settings: tracer handle, rate limiting, hard-error mode, logging state, channel analyzers, and placeholder references to groups and scopes. Groups (flt_otel_conf_group) aggregate scopes by name. Scopes (flt_otel_conf_scope) bind an event to its ACL condition, span context declarations, span definitions and a list of spans scheduled for finishing. Spans (flt_otel_conf_span) carry attributes, events, baggages and status entries, each represented as flt_otel_conf_sample structures that pair a key with concatenated sample-expression arguments. All configuration types share a common header macro (FLT_OTEL_CONF_HDR) that embeds an identifier string, its length, a configuration line number, and a list link. Their init and free functions are generated by the FLT_OTEL_CONF_FUNC_INIT and FLT_OTEL_CONF_FUNC_FREE macros in conf_funcs.h, with per-type custom initialization and cleanup bodies. The utility layer in util.c provides argument counting and concatenation for the configuration parser, sample data to string conversion covering boolean, integer, IPv4, IPv6, string and HTTP method types, and debug helpers for dumping argument arrays and linked list state.
119 lines
8.4 KiB
C
119 lines
8.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#ifndef _OTEL_CONF_FUNCS_H_
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#define _OTEL_CONF_FUNCS_H_
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/*
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* Macro that generates a flt_otel_conf_<type>_init() function. The generated
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* function allocates and initializes a configuration structure of the given
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* type, checks for duplicate names in the list, and optionally runs a custom
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* initializer body.
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*/
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#define FLT_OTEL_CONF_FUNC_INIT(_type_, _id_, _func_) \
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struct flt_otel_conf_##_type_ *flt_otel_conf_##_type_##_init(const char *id, int line, struct list *head, char **err) \
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{ \
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struct flt_otel_conf_##_type_ *retptr = NULL; \
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struct flt_otel_conf_##_type_ *ptr; \
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size_t _id_##_len; \
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\
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OTELC_FUNC("\"%s\", %d, %p, %p:%p", OTELC_STR_ARG(id), line, head, OTELC_DPTR_ARGS(err)); \
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\
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if ((id == NULL) || (*id == '\0')) { \
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FLT_OTEL_ERR("name not set"); \
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\
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OTELC_RETURN_PTR(retptr); \
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} \
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\
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_id_##_len = strlen(id); \
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if (_id_##_len >= FLT_OTEL_ID_MAXLEN) { \
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FLT_OTEL_ERR("'%s' : name too long", id); \
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\
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OTELC_RETURN_PTR(retptr); \
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} \
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\
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if (head != NULL) \
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list_for_each_entry(ptr, head, list) \
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if (strcmp(ptr->_id_, id) == 0) { \
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FLT_OTEL_ERR("'%s' : already defined", id); \
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\
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OTELC_RETURN_PTR(retptr); \
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} \
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\
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retptr = OTELC_CALLOC(1, sizeof(*retptr)); \
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if (retptr != NULL) { \
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retptr->cfg_line = line; \
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retptr->_id_##_len = _id_##_len; \
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retptr->_id_ = OTELC_STRDUP(id); \
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if (retptr->_id_ != NULL) { \
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if (head != NULL) \
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LIST_APPEND(head, &(retptr->list)); \
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\
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FLT_OTEL_DBG_CONF_HDR("- conf_" #_type_ " init ", retptr, _id_); \
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} \
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else \
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OTELC_SFREE_CLEAR(retptr); \
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} \
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\
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if (retptr != NULL) { \
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_func_ \
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} \
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\
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if (retptr == NULL) \
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FLT_OTEL_ERR("out of memory"); \
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\
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OTELC_RETURN_PTR(retptr); \
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}
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/*
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* Macro that generates a flt_otel_conf_<type>_free() function. The generated
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* function runs a custom cleanup body, then frees the name string, removes the
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* structure from its list, and frees the structure.
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*/
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#define FLT_OTEL_CONF_FUNC_FREE(_type_, _id_, _func_) \
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void flt_otel_conf_##_type_##_free(struct flt_otel_conf_##_type_ **ptr) \
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{ \
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OTELC_FUNC("%p:%p", OTELC_DPTR_ARGS(ptr)); \
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\
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if ((ptr == NULL) || (*ptr == NULL)) \
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OTELC_RETURN(); \
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\
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{ _func_ } \
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\
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OTELC_SFREE((*ptr)->_id_); \
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FLT_OTEL_LIST_DEL(&((*ptr)->list)); \
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OTELC_SFREE_CLEAR(*ptr); \
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\
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OTELC_RETURN(); \
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}
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/* The FLT_OTEL_LIST_DESTROY() macro uses the following two definitions. */
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#define flt_otel_conf_ph_group_free flt_otel_conf_ph_free
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#define flt_otel_conf_ph_scope_free flt_otel_conf_ph_free
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/* Declare init/free function prototypes for a configuration type. */
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#define FLT_OTEL_CONF_FUNC_DECL(_type_) \
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struct flt_otel_conf_##_type_ *flt_otel_conf_##_type_##_init(const char *id, int line, struct list *head, char **err); \
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void flt_otel_conf_##_type_##_free(struct flt_otel_conf_##_type_ **ptr);
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FLT_OTEL_CONF_FUNC_DECL(hdr)
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FLT_OTEL_CONF_FUNC_DECL(str)
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FLT_OTEL_CONF_FUNC_DECL(ph)
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FLT_OTEL_CONF_FUNC_DECL(sample_expr)
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FLT_OTEL_CONF_FUNC_DECL(sample)
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FLT_OTEL_CONF_FUNC_DECL(context)
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FLT_OTEL_CONF_FUNC_DECL(span)
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FLT_OTEL_CONF_FUNC_DECL(scope)
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FLT_OTEL_CONF_FUNC_DECL(group)
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FLT_OTEL_CONF_FUNC_DECL(instr)
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#endif /* _OTEL_CONF_FUNCS_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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