1c59c39171
HAProxy used to call hlua_init() unconditionally from step_init_1(), before any configuration file was parsed. As a consequence, Lua states 0 and 1 were always created with hlua_openlibs_flags set to its default value (HLUA_OPENLIBS_ALL), regardless of any tune.lua.openlibs directive that appeared later in the global section. With multiple threads, states 2..N were created correctly in hlua_post_init() after the config had been parsed, while states 0 and 1 retained the full standard-library set. This produced the observable bug reported in GitHub issue #3396: a script loaded with lua-load-per-thread could see require() as a function on thread 1 but nil on thread 2 when tune.lua.openlibs was used to restrict the available libraries. The initialisation is now lazy. hlua_init() is idempotent: it returns immediately if the states already exist (hlua_states[0] != NULL). It is called explicitly from the three config keyword handlers that need the Lua states to be live before they can do their work (lua-load, lua-load-per-thread, lua-prepend-path) and from tune.lua.openlibs, after the hlua_openlibs_flags variable has been updated, so that the states are always created with the correct library set. hlua_post_init() calls hlua_init() unconditionally as a safety net, covering the case where no Lua directive appeared in the configuration at all (no global section, or only pure-tuning directives such as timeouts and memory limits), and ensuring correct behaviour with multiple consecutive global sections. As a result of this change, tune.lua.openlibs must now appear before lua-load, lua-load-per-thread, and lua-prepend-path in the configuration; if any of those keywords is encountered first, the Lua states will already be initialised and tune.lua.openlibs with a non-default value will return a parse error. No backport needed. |
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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.