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The wake handler detects if the frontend is closed. This can happen if the proxy has been disabled individually or even on process soft-stop. Before this patch, in this condition QCS instances were freed before being detached from the cs_endpoint. This clearly violates the haproxy connection architecture and cause a BUG_ON statement crash in cs_free(). To handle this properly, cs_endpoint is notified by setting RD_SH|WR_SH on connection flags. The cs_endpoint will thus use the detach operation which allows the QCS instance to be freed. This code allows the soft-stop process to complete as soon as possible. However, the client is not notified about the connection closing. It should be done by emitting a H3 GOAWAY + CONNECTION_CLOSE. Sadly, this is impossible at this stage because the listener sockets are closed so the quic-conn cannot use it to emit new frames. At this stage the client will most probably detect connection closing on its idle timeout expiration. Thus, to completely support proxy closing/soft-stop, important architecture changes are required in QUIC socket management. This is also linked with the reload feature.
The HAProxy documentation has been split into a number of different files for ease of use. 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)