python-rados: implement new aio_execute

[iain-buclaw-sociomantic]

This exposes to the python API for the following C methods:

• rados_aio_exec

The function was added to the C library in #11709.

[liewegas]

@jdurgin safe for kraken?

[jdurgin]

Yeah, happy to have pybind updates for kraken since they're low risk and much easier to depend on when they're in the same release as the new c function.

[liewegas]

2016-11-29T04:21:25.622 INFO:tasks.workunit.client.0.smithi019.stderr:======================================================================
2016-11-29T04:21:25.622 INFO:tasks.workunit.client.0.smithi019.stderr:ERROR: test_rados.TestIoctx.test_aio_execute
2016-11-29T04:21:25.623 INFO:tasks.workunit.client.0.smithi019.stderr:----------------------------------------------------------------------
2016-11-29T04:21:25.623 INFO:tasks.workunit.client.0.smithi019.stderr:Traceback (most recent call last):
2016-11-29T04:21:25.623 INFO:tasks.workunit.client.0.smithi019.stderr:  File "/usr/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
2016-11-29T04:21:25.623 INFO:tasks.workunit.client.0.smithi019.stderr:    self.test(*self.arg)
2016-11-29T04:21:25.623 INFO:tasks.workunit.client.0.smithi019.stderr:  File "/home/ubuntu/cephtest/mnt.0/client.0/tmp/test_rados.py", line 837, in test_aio_execute
2016-11-29T04:21:25.623 INFO:tasks.workunit.client.0.smithi019.stderr:    comp = self.ioctx.aio_exec("foo", "hello", "say_hello", b"", oncomplete=cb)
2016-11-29T04:21:25.623 INFO:tasks.workunit.client.0.smithi019.stderr:AttributeError: 'rados.Ioctx' object has no attribute 'aio_exec'

http://pulpito.ceph.com/sage-2016-11-29_03:30:55-rados-wip-sage-testing---basic-smithi/584354

[iain-buclaw-sociomantic]

@liewegas - Oops, looks like a typo. I just about managed to work out how to run the tests a couple hours ago but haven't looked since. I should add the safe callback tests first though.

[jdurgin]

could you add your signed-off-by to the commits as well (git commit -s adds it for you, and works with --amend)

[iain-buclaw-sociomantic]

@jdurgin - Signed and tested.

I updated the safe callback to removed the _PyBytes_Resize something in the internals of cython really didn't enjoy the double resize of the string.

Exception SystemError: '../Objects/stringobject.c:3903: bad argument to internal function' in 'rados.__aio_safe_cb' ignored

[jdurgin]

thanks! looks good

[yuriw]

http://pulpito.ceph.com/yuriw-2016-11-30_21:14:14-rados-wip-yuri-testing2_2016_11_30-distro-basic-smithi/

rerun

http://pulpito.ceph.com/yuriw-2016-12-01_05:29:28-rados-wip-yuri-testing2_2016_11_30-distro-basic-smithi/

@jdurgin pls merge

[jdurgin]

merged manually - had to remove tabs from test_rados.py for python3

[iain-buclaw-sociomantic]

merged manually - had to remove tabs from test_rados.py for python3

Oops, sorry about that. And thanks!