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appctx_rcv_buf() prepares all the work to schedule the transfers between the applet and the channel, and it takes care of setting the various flags that indicate what condition is blocking the transfer from progressing. There is one limitation though. In case an applet refrains from sending data (e.g. rate-limited, prefers to aggregate blocks etc), it will leave a possibly empty channel buffer, and keep some data in its outbuf. The data in its outbuf will be seen by the function above as an indication of a channel full condition, so it will place SE_FL_WANT_ROOM. But later, sc_applet_recv() will see this flag with a possibly empty channel, and will rightfully trigger a BUG_ON(). appctx_rcv_buf() should be more accurate in fact. It should only set SE_FL_RCV_MORE when more data are present in the applet, then it should either set or clear SE_FL_WANT_ROOM dependingon whether the channel is empty or not. Right now it doesn't seem possible to trigger this condition in the current state of applets, but this will become possible with a future bugfix that will have to be backported, so this patch will need to be backported to 3.0.
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.