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HAProxy - Load balancer
2e962a5443
Replaced the stub filter callbacks with full implementations that dispatch OTel events through the scope execution engine, and added the supporting debug, error handling and utility infrastructure. The filter lifecycle callbacks (init, deinit, init_per_thread) now initialize the OpenTelemetry C wrapper library, create the tracer from the instrumentation configuration file, enable HTX stream filtering, and clean up the configuration and memory pools on shutdown. The stream callbacks (attach, stream_start, stream_set_backend, stream_stop, detach, check_timeouts) create the per-stream runtime context on attach with rate-limit based sampling, fire the corresponding OTel events (on-stream-start, on-backend-set, on-stream-stop), manage the idle timeout timer with reschedule logic in detach, and free the runtime context in check_timeouts. The attach callback also registers the required pre and post channel analyzers from the instrumentation configuration. The channel callbacks (start_analyze, pre_analyze, post_analyze, end_analyze) register per-channel analyzers, map analyzer bits to event indices via flt_otel_get_event(), and dispatch the matching events. The end_analyze callback also fires the on-server-unavailable event when response analyzers were configured but never executed. The HTTP callbacks (http_headers, http_end, http_reply, and the debug-only http_payload and http_reset) dispatch their respective request/response events based on the channel direction. The event dispatcher flt_otel_event_run() in event.c iterates over all scopes matching a given event index and calls flt_otel_scope_run() for each, sharing a common monotonic and wall-clock timestamp across all spans within a single event. Error handling is centralized in flt_otel_return_int() and flt_otel_return_void(), which implement the hard-error/soft-error policy: hard errors disable the filter for the stream, soft errors are silently cleared. The new debug.h header provides conditional debug macros (FLT_OTEL_DBG_ARGS, FLT_OTEL_DBG_BUF) and the FLT_OTEL_LOG macro for structured logging through the instrumentation's log server list. The utility layer gained debug-only label functions for channel direction, proxy mode, stream position, filter type, and analyzer bit name lookups. |
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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.