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0b9e190028
This patch adds the possibility to add a set of conditions to a set-var
call, be it a converter or an action (http-request or http-response
action for instance). The conditions must all be true for the given
set-var call for the variable to actually be set. If any of the
conditions is false, the variable is left untouched.
The managed conditions are the following : "ifexists", "ifnotexists",
"ifempty", "ifnotempty", "ifset", "ifnotset", "ifgt", "iflt". It is
possible to combine multiple conditions in a single set-var call since
some of them apply to the variable itself, and some others to the input.
This patch does not change the fact that variables of scope proc are
still created during configuration parsing, regardless of the conditions
that might be added to the set-var calls in which they are mentioned.
For instance, such a line :
http-request set-var(proc.foo,ifexists) int(5)
would not prevent the creation of the variable during init, and when
actually reaching this line during runtime, the proc.foo variable would
already exist. This is specific to the proc scope.
These new conditions mean that a set-var could "fail" for other reasons
than memory allocation failures but without clearing the contents of the
variable.
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)