It happens that a few "if USE_foo" were placed too low in the makefile,
and would mostly work by luck thanks to not using variables that were
already referenced before. The opentracing include is even trickier
because it extends OPTIONS_CFLAGS that was last read a few lines before
being included, but it only works because COPTS is defined as a macro and
not a variable, so it will be evaluated later. At least now it doesn't
touch OPTIONS_* anymore and since it's cleanly arranged, it will work by
default via the flags collector.
Let's just move these late USE_* handlers upper and place a visible
delimiter after them reminding not to add any after.
This reverts commit 6c9f7faa62.
This warning is no longer needed because source code can be compiled with
enabled support for OpenTracing context transfer via HAProxy variables.
This patch must be backported in 2.5.
In case of using parameter 'OT_USE_VARS=1', the value of the OT_DEFINE
variable is set incorrectly (i.e. the previous value was deleted and a
new one set instead of adding new content).
This patch must be backported in 2.5.
Please do not set the OT_USE_VARS configuration variable, as the source
will probably not be able to compile! For now, this variable can only
be used for experimental purposes, and is not intended for wider use.
For further clarification, please see commit 4cb2c83f4.
Must be backported to 2.5.
Due to a recent change in the handling of haproxy variables, their use for
OpenTracing context transfer has been excluded from the compilation process.
The use of variables can be re-enabled if the newly defined variable
OT_USE_VARS is set to 1 when calling the 'make' utility. However,
this should not be used for now as the compilation will end in error.
This change prevents the use of haproxy variables to convey the OpenTracing
context. This means that the 'use-vars' parameter cannot be used in the
OpenTracing filter configuration for 'inject' and 'extract' operations.
An example configuration that uses this feature is in the test/ctx
directory, while the script to run that test is test/run-ctx.sh.
Then, the 'sess.ot.uuid' variable is no longer set when initializing the
OpenTracing session. This means that this variable can still be used in
the OpenTracing configuration, but its contents will be empty.
In case the OpenTracing C Wrapper library was installed as part of the
system (ie in a directory that pkg-config considers part of the system),
HAProxy building was not possible because in that case pkg-config did
not set the value of the OT_CFLAGS variable in the addon Makefile.
This resolves GitHub issue #1323.
This one is the last optional module to build with haproxy, so let's move
it to addons/. It was renamed to "ot" as it was the only one whose USE_*
option did not match the directory name, now this is consistent.
Few changes were required, only the Makefile, and doc were adjusted, as
the directory was already self-contained and relocatable.
Willy Tarreau
Miroslav Zagorac