Re: P4P release 1.0 (PVAccess for Python)

["Williams Jr., Ernest L." <ernesto@slac.stanford.edu>]

Hi Michael,

Awesome news.  Thanks for releasing this.

My initial results are below.

I look forward to continued tests

---

From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Michael Davidsaver <mdavidsaver@gmail.com>
Sent: Sunday, February 11, 2018 2:59 PM
To: EPICS Tech-Talk
Subject: P4P release 1.0 (PVAccess for Python)

 

The first release of the P4P (PVAccess for Python) module is available

P4P is a binding for the PVAccess protocol client, and part of the server APIs.
The client get, put, rpc, and monitor operations are supported.  As a server,
only the rpc operation can be implemented.

Download

https://github.com/mdavidsaver/p4p/releases/download/1.0/p4p-1.0.tar.gz


Building from source

https://mdavidsaver.github.io/p4p/building.html

<============ Building ================>==================================>

The build was successful.

Host OS == Fedora release 27 (Twenty Seven)

Kernel == 4.14.16-300.fc27.x86_64

GCC == gcc version 7.3.1 20180130 (Red Hat 7.3.1-2) (GCC)

EPICS_BASE = R7.0.1.1

PYTHON = Python 3.6.4

numpy =  numpy==1.14.0

<========================================================================>

===> Running unittests =======================================================<

Some results when building from source on Fedora 26:

make nose does not succeed: (maybe because I am using python3?)

[ernesto@localhost p4p-1.0]$ make nose
make -C ./configure install  
make[1]: Entering directory '/usr/local/controls/package/p4p-1.0/configure'
make -C O.linux-x86_64 -f ../Makefile TOP=../.. \
   T_A=linux-x86_64 install
make[2]: Entering directory '/usr/local/controls/package/p4p-1.0/configure/O.linux-x86_64'
make[2]: Nothing to be done for 'install'.
make[2]: Leaving directory '/usr/local/controls/package/p4p-1.0/configure/O.linux-x86_64'
make[1]: Leaving directory '/usr/local/controls/package/p4p-1.0/configure'
make -C ./src install  
make[1]: Entering directory '/usr/local/controls/package/p4p-1.0/src'
make -C O.linux-x86_64 -f ../Makefile TOP=../.. \
   T_A=linux-x86_64 install
make[2]: Entering directory '/usr/local/controls/package/p4p-1.0/src/O.linux-x86_64'
make[2]: Nothing to be done for 'install'.
make[2]: Leaving directory '/usr/local/controls/package/p4p-1.0/src/O.linux-x86_64'
make[1]: Leaving directory '/usr/local/controls/package/p4p-1.0/src'
make -C src/O.linux-x86_64 nose
make[1]: Entering directory '/usr/local/controls/package/p4p-1.0/src/O.linux-x86_64'
make -f ../Makefile TOP=../.. T_A=linux-x86_64  nose
make[2]: Entering directory '/usr/local/controls/package/p4p-1.0/src/O.linux-x86_64'
PYTHONPATH="/usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64" python -m nose -P p4p
E
======================================================================
ERROR: Failure: ImportError (/usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64/p4p/_p4p.so: undefined symbol: _Py_FalseStruct
)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/usr/lib/python2.7/site-packages/nose/loader.py", line 407, in loadTestsFromName
   module = resolve_name(addr.module)
 File "/usr/lib/python2.7/site-packages/nose/util.py", line 312, in resolve_name
   module = __import__('.'.join(parts_copy))
 File "/usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64/p4p/__init__.py", line 2, in <module>
   from .wrapper import Value, Type
 File "/usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64/p4p/wrapper.py", line 2, in <module>
   from ._p4p import Type, Value
ImportError: /usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64/p4p/_p4p.so: undefined symbol: _Py_FalseStruct

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1)
make[2]: *** [../Makefile:55: nose] Error 1
make[2]: Leaving directory '/usr/local/controls/package/p4p-1.0/src/O.linux-x86_64'
make[1]: *** [Makefile:8: nose] Error 2
make[1]: Leaving directory '/usr/local/controls/package/p4p-1.0/src/O.linux-x86_64'
make: *** [Makefile:17: nose] Error 2
[ernesto@localhost p4p-1.0]$


However, the other recommended option does run and complete with success

[ernesto@localhost linux-x86_64]$ cd /usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64
[ernesto@localhost linux-x86_64]$ PYTHONPATH=/usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64 nosetests-3
..........................2018-02-11T17:34:47.253 Using dynamically assigned TCP port 35359.
.2018-02-11T17:34:47.284 Using dynamically assigned TCP port 36373.
.....2018-02-11T17:34:47.402 Using dynamically assigned TCP port 48073.
.........................
----------------------------------------------------------------------
Ran 57 tests in 1.084s

OK
[ernesto@localhost linux-x86_64]$


Initial tests with command line tools look good as well:

[ernesto@localhost linux-x86_64]$ PYTHONPATH=/usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64 python3 -m p4p.client.cli get
ernesto:aiExample1
ernesto:aiExample1 Sun Feb 11 17:36:51 2018 9.0
[ernesto@localhost linux-x86_64]$ PYTHONPATH=/usr/local/controls/package/p4p-1.0/python3.6m/linux-x86_64 python3 -m p4p.client.cli moni
tor ernesto:aiExample1
ernesto:aiExample1 Sun Feb 11 17:37:09 2018 7.0
ernesto:aiExample1 Sun Feb 11 17:37:10 2018 8.0
ernesto:aiExample1 Sun Feb 11 17:37:11 2018 9.0
ernesto:aiExample1 Sun Feb 11 17:37:12 2018 0.0
ernesto:aiExample1 Sun Feb 11 17:37:13 2018 1.0
ernesto:aiExample1 Sun Feb 11 17:37:14 2018 2.0
ernesto:aiExample1 Sun Feb 11 17:37:15 2018 3.0
ernesto:aiExample1 Sun Feb 11 17:37:16 2018 4.0
ernesto:aiExample1 Sun Feb 11 17:37:17 2018 5.0
ernesto:aiExample1 Sun Feb 11 17:37:18 2018 6.0
ernesto:aiExample1 Sun Feb 11 17:37:19 2018 7.0
^C[ernesto@localhost linux-x86_64]$

<======================================================================================>

Getting started with the client API

https://mdavidsaver.github.io/p4p/starting.html


Writing an RPC server (and client)

https://mdavidsaver.github.io/p4p/rpc.html


documentation index

https://mdavidsaver.github.io/p4p/