[Loris-dev] Error on data dictionary

[Eli Johnson]

Hi Dave,

There was nothing logged in the apache error log. I don't think I have
newlines in any of the instruments. If this is just an issue with our
instance of LORIS and you can't recreate the issue, I can troubleshoot it
more in the future. For now it's not urgent. I'll follow up if I have
further questions.

-Eli

Eli Johnson
Developer/Data Manager
Institute of Child Development
University of Minnesota
joh17964 at umn.edu


On Tue, Nov 16, 2021 at 11:29 AM Dave MacFarlane <dave.macfarlane at mcin.ca>
wrote:

> Hi Eli,
>
> I'm not able to reproduce this on the raisinbread dataset. It sounds like
> LORIS is generating the "Content-Length" header based on the json data, but
> something is printing newlines before the output is sent, resulting in the
> browser reading those, and then stopping reading once Content-length bytes
> are read.
>
> The main change in the diff between the v23.0.0 and v23.0.8 versions in
> the module seems to be that it instantiates instruments to get the table
> name now, suggesting it might be a problem originating from one of your
> instruments. I tried adding a print newline into the setup function of an
> arbitrary instrument and got warnings such as:
>
> *Warning*: Cannot modify header information - headers already sent by
> (output started at
> /home/driusan/Code/Loris/project/instruments/NDB_BVL_Instrument_mri_parameter_form.class.inc:53)
> in */home/driusan/Code/Loris/htdocs/index.php* on line *60*
>
> but it's possible that the display of the warning is php.ini sensitive. I
> also tried adding newlines after the PHP closing tag in some files and got
> the same warning.
>
> Those warnings some from the PHP side, but on the loris side there should
> also be an error logged to your apache logs if there's a problem
> instantiating the instrument:
>
> error_log(
> "There was a problem instantiating the instrument ".
> "'$instrument'. Make sure the instrument is valid and ".
> "functional in order for it to be displayed in the data ".
> "dictionary."
> );
>
> It shouldn't cause newlines to be printed, but it's possible that
> something in the attempt to instantiate the instrument does. Do you get
> that error in your logs?
>
> - Dave
>
> On Thu, Nov 11, 2021 at 7:17 PM Eli Johnson <joh17964 at umn.edu> wrote:
>
>> Hi Dave,
>>
>> I reverted to the v23.0.0 version of the datadict module and it's working
>> properly again.
>>
>> I did inspect the returned values -- the json data package returned by
>> "<lorisurl>/datadict/?format=json" appears to be cut off. For some reason
>> it looks like ~40 newlines have been added before the json begins and then
>> an equivalent number of characters have been cut off from the end. I didn't
>> find any obvious issues when briefly inspecting the v23.0.8 changes to
>> php/datadict.class.inc but something there appears to be the source of the
>> issue.
>>
>> Best,
>> Eli
>>
>>
>> Eli Johnson
>> Developer/Data Manager
>> Institute of Child Development
>> University of Minnesota
>> joh17964 at umn.edu
>>
>>
>> On Thu, Nov 11, 2021 at 8:24 AM Dave MacFarlane <dave.macfarlane at mcin.ca>
>> wrote:
>>
>>> Hi Eli,
>>>
>>> I'm not sure why that would have broken between 2 bug fix releases, but
>>> the error "SyntaxError: Unexpected end of JSON input" implies that the
>>> attempt to fetch the fields returned invalid input. This can happen if, for
>>> instance, an exception is thrown by the ajax request. If you open the
>>> network tab* in your developer tools before loading the page there should
>>> be a request for "(your url)/datadict/fields". Click on that, and then the
>>> "Response" tab* in the network tools and you should get a better idea of
>>> what's being returned to debug.
>>>
>>> * That's how they're labeled in Firefox. I'm not sure off the top of my
>>> head what the labels are in Chrome but it should be similar.
>>>
>>> On Wed, Nov 10, 2021 at 2:29 PM Eli Johnson <joh17964 at umn.edu> wrote:
>>>
>>>> Hi,
>>>>
>>>> I am updating from LORIS v23.0.2 to v23.0.8 (running on RHEL7).
>>>> Everything is working except the data dictionary. I'm getting an error when
>>>> trying to load the data dictionary module. The data dictionary page
>>>> contains the text "An error occurred while loading the page", there is
>>>> nothing logged in the apache error-log, the browser console reports
>>>> "SyntaxError: Unexpected end of JSON input" on dataDictIndex.js:49.  I'm
>>>> not super familiar with react so I'm not sure how to find the source of the
>>>> error although it looks like it's occurring on *fetchData*. Any idea
>>>> why this would happen or suggestions on how to debug?
>>>>
>>>> Thanks,
>>>> Eli
>>>>
>>>> Eli Johnson
>>>> Developer/Data Manager
>>>> Institute of Child Development
>>>> University of Minnesota
>>>> joh17964 at umn.edu
>>>> _______________________________________________
>>>> Loris-dev mailing list
>>>> Loris-dev at bic.mni.mcgill.ca
>>>> https://mailman.bic.mni.mcgill.ca/mailman/listinfo/loris-dev
>>>>
>>>
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