a96f1286a7
A connection can be stored in several lists, thus there is several attach points in struct connection. Depending on its proxy side, either frontend or backend, a single connection will only access some of them during its lifetime. As an optimization, these attach points are organized in a union. However, this repartition was not correctly achieved along frontend/backend side delimitation. Furthermore, reverse HTTP has recently been introduced. With this feature, a connection can migrate from frontend to backend side or vice versa. As such, it becomes even more tedious to ensure that these members are always accessed in a safe way. This commit rearrange these fields. First, union is now clearly splitted between frontend and backend only elements. Next, backend elements are initialized with conn_backend_init(), which is already used during connection reversal on an edge endpoint. A new function conn_frontend_init() serves to initialize the other members, called both on connection first instantiation and on reversal on a dialer endpoint. This model is much cleaner and should prevent any access to fields from the wrong side. Currently, there is no known case of wrong access in the existing code base. However, this cleanup is considered an improvement which must be backported up to 3.0 to remove any possible undefined behavior.
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.