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ea9d05de02
Added the span context injection and extraction layer that bridges the OTel C wrapper's propagation API with HAProxy's HTTP headers and text map carriers. The new otelc.c module implements four public functions that wrap the OTel C wrapper's context propagation methods: flt_otel_inject_text_map() and flt_otel_inject_http_headers() serialize a span's context into a text map or HTTP headers carrier for outbound propagation, while flt_otel_extract_text_map() and flt_otel_extract_http_headers() deserialize an inbound carrier into an otelc_span_context for parent linking. Each direction uses a pair of callbacks registered on the carrier structure. The injection writers (flt_otel_text_map_writer_set_cb and flt_otel_http_headers_writer_set_cb) store key-value pairs emitted by the SDK into the carrier's text map via OTELC_TEXT_MAP_ADD(). The extraction readers (flt_otel_text_map_reader_foreach_key_cb and flt_otel_http_headers_reader_foreach_key_cb) iterate the carrier's text map entries and pass each pair to the SDK's handler callback. The scope context initialization in flt_otel_scope_context_init() now calls flt_otel_extract_http_headers() to extract the span context from the provided text map carrier and stores it in the scope context structure, making extracted contexts available for parent linking in subsequent span creation.
28 lines
1.0 KiB
C
28 lines
1.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#ifndef _OTEL_OTELC_H_
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#define _OTEL_OTELC_H_
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/* Inject span context into a text map carrier. */
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int flt_otel_inject_text_map(const struct otelc_span *span, struct otelc_text_map_writer *carrier);
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/* Inject span context into an HTTP headers carrier. */
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int flt_otel_inject_http_headers(const struct otelc_span *span, struct otelc_http_headers_writer *carrier);
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/* Extract span context from a text map carrier. */
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struct otelc_span_context *flt_otel_extract_text_map(struct otelc_tracer *tracer, struct otelc_text_map_reader *carrier, const struct otelc_text_map *text_map);
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/* Extract span context from an HTTP headers carrier. */
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struct otelc_span_context *flt_otel_extract_http_headers(struct otelc_tracer *tracer, struct otelc_http_headers_reader *carrier, const struct otelc_text_map *text_map);
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#endif /* _OTEL_OTELC_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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