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It is quite common to see in configurations constructions like the
following one:
http-request set-var(txn.bodylen) 0
http-request set-var(txn.bodylen) req.hdr(content-length)
...
http-request set-header orig-len %[var(txn.bodylen)]
The set-var() rules are almost always duplicated when manipulating
integers or any other value that is mandatory along operations. This is
a problem because it makes the configurations complicated to maintain
and slower than needed. And it becomes even more complicated when several
conditions may set the same variable because the risk of forgetting to
initialize it or to accidentally reset it is high.
This patch extends the var() sample fetch function to take an optional
argument which contains a default value to be returned if the variable
was not set. This way it becomes much simpler to use the variable, just
set it where needed, and read it with a fall back to the default value:
http-request set-var(txn.bodylen) req.hdr(content-length)
...
http-request set-header orig-len %[var(txn.bodylen,0)]
The default value is always passed as a string, thus it will experience
a cast to the output type. It doesn't seem userful to complicate the
configuration to pass an explicit type at this point.
The vars.vtc regtest was updated accordingly.
* Regression testing for HAProxy with VTest *
This little README file is about how to compile and run vtest test case files (VTC files)
to test HAProxy for any regression.
To do so, you will have to compile vtest program sources which depends on
Varnish cache application sources. vtest, formerly varnishtest, is a very useful
program which has been developed to test Varnish cache application. vtest has been
modified in collaboration with Varnish cache conceptor Poul-Henning Kamp to support
HAProxy in addition to Varnish cache.
See also: doc/regression-testing.txt
* vtest compilation *
$ git clone https://github.com/vtest/VTest
$ cd VTest
$ make vtest
Then vtest program may be found at the root directory of vtest sources directory.
The Varnish cache manuals are located in 'man' directory of Varnish cache sources
directory. You will have to have a look at varnishtest(7) and vtc(7) manuals to
use vtest.
Some information may also be found in doc/regression-testing.txt in HAProxy
sources.
Note that VTC files for Varnish cache may be found in bin/varnishtest/tests directory
of Varnish cache sources directory which may be found here:
https://github.com/varnishcache/varnish-cache
* vtest execution *
You must set HAPROXY_PROGRAM environment variable to give the location
of the HAProxy program to test to vtest:
$ HAPROXY_PROGRAM=<my haproxy program> vtest ...
The HAProxy VTC files found in HAProxy sources may be run with the reg-tests
Makefile target. You must set the VTEST_PROGRAM environment variable to
give the location of the vtest program which has been previously compiled.
$ VTEST_PROGRAM=<my vtest program> make reg-tests
"reg-tests" Makefile target run scripts/run-regtest.sh script.
To get more information about this script run it with --help option.
Note that vtest is run with -t10 and -l option. -l option is to keep
keep vtest temporary directory in case of failed test cases. core files
may be found in this directory (if enabled by ulimit).
* vtest patches for HAProxy VTC files *
When producing a patch to add a VTC regression testing file to reg-tests directory,
please follow these simple rules:
- If your VTC file needs others files, if possible, use the same basename as that
of the VTC file,
- Put these files in a directory with the same name as the code area concerned
by the bug ('peers', 'lua', 'acl' etc).