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.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.