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https://github.com/haproxy/haproxy.git
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8effcac6f5
Added the HTTP header manipulation layer that enables span context injection into and extraction from HAProxy's HTX message buffers, completing the end-to-end context propagation path. The new http.c module implements three public functions: flt_otel_http_headers_get() extracts HTTP headers matching a name prefix from the channel's HTX buffer into an otelc_text_map structure, stripping the prefix and separator dash from header names before storage; flt_otel_http_header_set() constructs a full header name from a prefix and suffix joined by a dash, removes all existing occurrences, and optionally adds the header with a new value; and flt_otel_http_headers_remove() removes all headers matching a given prefix. A debug-only flt_otel_http_headers_dump() logs all HTTP headers from a channel at NOTICE level. The scope runner in event.c now extracts propagation contexts from HTTP headers before processing spans: for each configured extract context, it calls flt_otel_http_headers_get() to read matching headers into a text map, then passes the text map to flt_otel_scope_context_init() which extracts the OTel span context from the carrier. After span execution, the span runner injects the span context back into HTTP headers via flt_otel_inject_http_headers() followed by flt_otel_http_header_set() for each propagation key. The unused resource cleanup in flt_otel_scope_free_unused() now also removes contexts that failed extraction by deleting their associated HTTP headers via flt_otel_http_headers_remove() before freeing the scope context structure.
51 lines
1,022 B
C
51 lines
1,022 B
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#ifndef _OTEL_INCLUDE_H_
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#define _OTEL_INCLUDE_H_
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#include <errno.h>
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#include <stdbool.h>
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#include <math.h>
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#include <values.h>
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#include <haproxy/api.h>
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#include <haproxy/cfgparse.h>
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#include <haproxy/acl.h>
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#include <haproxy/cli.h>
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#include <haproxy/clock.h>
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#include <haproxy/filters.h>
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#include <haproxy/http_htx.h>
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#include <haproxy/http_rules.h>
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#include <haproxy/log.h>
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#include <haproxy/proxy.h>
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#include <haproxy/sample.h>
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#include <haproxy/tcp_rules.h>
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#include <haproxy/tools.h>
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#include <haproxy/vars.h>
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#include <opentelemetry-c-wrapper/include.h>
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#include "config.h"
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#include "debug.h"
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#include "define.h"
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#include "event.h"
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#include "conf.h"
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#include "conf_funcs.h"
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#include "filter.h"
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#include "http.h"
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#include "otelc.h"
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#include "parser.h"
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#include "pool.h"
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#include "scope.h"
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#include "util.h"
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#endif /* _OTEL_INCLUDE_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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