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ChristianTremblay / pyhaystack

Pyhaystack is a module that allow python programs to connect to a haystack server project-haystack.org. Connection can be established with Niagara Platform running the nhaystack, Skyspark and Widesky. For this to work with Anaconda IPython Notebook in Windows, be sure to use "python setup.py install" using the Anaconda Command Prompt in Windows. If not, module will be installed for System path python but won't work in the environment of Anaconda IPython Notebook. You will need hszinc 1.3+ for this to work.
Apache License 2.0
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help with HisReadSeriesOperation #77

Closed apigott closed 5 years ago

apigott commented 5 years ago

I've got a session open with skyspark and can pull data via session.about(), etc but HisReadSeriesOperation is giving me issues. My code:

op = pyhaystack.client.ops.his.HisReadSeriesOperation(session, '<point name>', 'today', None, 'dict')
op.go()
op.wait()

Always returns op.is_failed = True. The traceback looks like this:

Traceback (most recent call last):
  File "pyhay.py", line 64, in <module>
    if (op.result):
  File "C:\Users\USAP677924\api\lib\site-packages\pyhaystack\util\state.py", line 97, in result
    self._result.reraise()
  File "C:\Users\USAP677924\api\lib\site-packages\pyhaystack\util\asyncexc.py", line 28, in reraise
    reraise(*self._exc_info)
  File "C:\Users\USAP677924\api\lib\site-packages\six.py", line 693, in reraise
    raise value
  File "C:\Users\USAP677924\api\lib\site-packages\pyhaystack\client\ops\his.py", line 104, in _on_read
    grid = operation.result
  File "C:\Users\USAP677924\api\lib\site-packages\pyhaystack\util\state.py", line 97, in result
    self._result.reraise()
  File "C:\Users\USAP677924\api\lib\site-packages\pyhaystack\util\asyncexc.py", line 28, in reraise
    reraise(*self._exc_info)
  File "C:\Users\USAP677924\api\lib\site-packages\six.py", line 693, in reraise
    raise value
  File "C:\Users\USAP677924\api\lib\site-packages\pyhaystack\client\ops\grid.py", line 298, in _check_err
    grid.metadata.get('traceback', None))
pyhaystack.exception.HaystackError: sys::CastErr: java.lang.ClassCastException

Also I assume that the output of HisReadSeriesOperation is similar to the data series to be written in HisWriteSeriesOperation but the documentation doesn't really elaborate on that...

sjlongland commented 5 years ago

On 6/8/19 11:17 pm, apigott wrote:

op = pyhaystack.client.ops.his.HisReadSeriesOperation(session, '', 'today', None, 'dict') op.go() op.wait()

Errm yeah, do NOT go creating the operation objects yourself. There are factory methods on the session object for doing that. Those factory methods perform various data normalisation tasks on the inputs before creating the operation object to manage the actual request.

https://pyhaystack.readthedocs.io/en/latest/his.html#zinc-date-and-time-format -- Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind... ...it's backed up on a tape somewhere.

ChristianTremblay commented 5 years ago

One thing possible is to manually create a similar request and check in a browser how the server respond.

Not always easy but it may help knowing where the bug is : in the server or in the script.

apigott commented 5 years ago

Thanks guys got it working! @sjlongland was right and I was using HisReadSeriesOperation so did a bit of reading up on factory methods.

ChristianTremblay commented 5 years ago

@Stuart is awesome ;-)