Hi Alberto,
Please see inline ….
On Apr 8, 2015, at 1:54 AM, [email protected]<mailto:[email protected]>
wrote:
Dear all,
I'm trying to create a new message to send with Sandesh protocol, however I
don't know how to compile the generated code.
Just a high level overview which you might already know. The sandesh
compiler/code generator will be present in build/bin/sandesh after you execute
scons at the top level. The source code for same is at This is used to generate
the python/C++ code based on the .sandesh file. The generated code - .py files
for python and .cpp files for C++ need to be used with the pysandesh package
for python and libsandesh for C++ in client applications to send Sandesh
messages to the contrail collector.
Are you using C++ or python?
We intend to use this messaging for testing purposes (at the moment) by means
of an extra application which will send Sandesh messages each second.
I have found the following explaination for the compilation with Scons:
--------
To use Sandesh, the following needs to be added to the module SConscript:
/
# Generate the source files
SandeshGenFiles = env.SandeshGenCpp('VNS.sandesh')
SandeshGenFiles += env.SandeshGenCpp('VNSwitch.sandesh')
# The above returns VNS_types.h, VNS_types.cpp, VNS_constants.h
# VNS_constants.cpp, VNSwitch_types.h, VNSwitch_types.cpp,
# VNSwitch_constants.h, VNSwitch_constants.cpp
# To include the header files above from your module's sources
env.Append(CPPPATH = env['TOP'])
# Extract the .cpp files to be used as sources
SandeshGenSrcs = env.ExtractCpp(SandeshGenFiles)
Add SandeshGenSrcs to the module source files
Add libsandesh, and libbase to the module libraries.
--------
However I don't really get what's going on (I'm new to Scons).
The SandeshGenCpp function/ scons builder is defined in tools/build/rules.py -
https://github.com/Juniper/contrail-build
Below is a relevant snippet …
# SandeshGenCpp Methods
def SandeshCppBuilder(target, source, env):
opath = target[0].dir.path
sname = os.path.join(opath, os.path.splitext(source[0].name)[0])
code = subprocess.call(env['SANDESH'] + ' --gen cpp --gen html -I
controller/src/ -I tools -out '
+ opath + " " + source[0].path, shell=True)
if code != 0:
raise SCons.Errors.StopError(SandeshCodeGeneratorError,
'SandeshCpp code generation failed')
tname = sname + "_html_template.cpp"
hname = os.path.basename(sname + ".xml")
cname = sname + "_html.cpp"
if not env.Detect('xxd'):
raise SCons.Errors.StopError(SandeshCodeGeneratorError,
'xxd not detected on system')
os.system("echo \"namespace {\"" + " >> " + cname)
os.system("(cd " + opath + " ; xxd -i " + hname + " >> " +
os.path.basename(cname) + " )")
os.system("echo \"}\"" + " >> " + cname)
os.system("cat " + tname + " >> " + cname)
As you can see, it runs build/bin/sandesh —gen cpp —gen html <other options>
<.sandesh file> to produce the .cpp, .h files which then need to be compiled in
the client application.
I tried to copy the SConscript of the control module and adapt it but without
results.
Can anyone help me?
Hope the above helps and please let me know if any more information is needed.
Thanks
Megh
Best Regards,
Alberto.
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