[ckan-dev] pycsw

Mon Oct 14 15:43:44 UTC 2013

Hi Tom,

Many thanks for this. I don't think there are automated tests for this
part of the code, just send the PR and I'll test it to make sure it
works.

BTW, I'm I right in thinking that this change is present in owslib 0.8.2?

https://github.com/geopython/OWSLib/commit/4b0a62cd37a5a03aafc5c0cd9606e0658d5ac664

Just so we can link it from our requirements file instead of the
particular commit:

https://github.com/okfn/ckanext-spatial/blob/master/pip-requirements.txt#L5

Cheers,

Adrià

On 14 October 2013 14:18, Tom Kralidis <tomkralidis at gmail.com> wrote:
> Hi: I will try to setup a CKAN development environment, but in the
> meantime, comments interleaved:
>
>
> On Fri, Oct 11, 2013 at 7:05 AM, Adrià Mercader <adria.mercader at okfn.org> wrote:
>> Hi Hilde,
>>
>> I'm sorry to hear that you are finding problems. The ckan-pycsw is
>> relatively recent addition and may still have some rough edges.
>>
>> Let's take it one step at a time and see if we can make progress, see
>> below for comments.
>>
>> On 10 October 2013 15:19, Hildegard Gerlach
>> <hildegard.gerlach at jrc.ec.europa.eu> wrote:
>>> Dear Angelos and Adrià,
>>> I am using Redhat 6, ckan version 2.2a
>>> PostgreSQL 8.4.13, Postgis 1.5.3
>>>  SQLAlchemy-0.7.8   (installed by CKAN requirements.txt)
>>
>> I strongly recommend always using stable versions unless you are
>> developing CKAN or the extensions. Use ckan 2.1, and the "stable"
>> branches of ckanext-spatial and ckanext-harvest
>> The rest of the versions seem fine
>>
>>> I am using a Postgis database for CKAN and have done harvesting from 2
>>> remote sources.
>> Great.
>>
>>> However I don't manage to load these sources into the newly
>>> created database for pycsw.
>>> In the pycsw.cfg file I have only changed the home and database settings.
>>> The database table has been created successfully with this command
>>>
>
> As reference, can we see/you post what a few of the metadata records
> look like from these sources?
>
>>> paster ckan-pycsw setup -p /etc/ckan/default/pycsw.cfg
>> That sounds fine
>>
>>
>>> In the meantime I went back to version 2.1, but I am not sure if this made
>>> any change.
>>> I did
>>>
>>> git checkout release-v2.1
>>> git pull
>>>
>>> pip install --upgrade -r requirements.txt
>>>
>>> for CKAN, the harvester and spatial extension. Is this the correct way ?
>> I wouldn't use the --upgrade flag unless you find some version number
>> conflicts. This will upgrade all dependencies which might have
>> unexpected results
>>
>>
>>> When harvesting before I had not specified anything in the development.ini
>>> file for
>>> Now I have set it to
>>> ckan.spatial.validator.profiles = iso19193eden
>> That is good, this is probably the best profile for generic iso
>> documents (iso19193ngdc is even a bit more permissive)
>>
>>> and tried to reharvest, but then I get another error:
>>> Error gathering the identifiers from the CSW server [Please use the updated
>>> 'getrecords2' method instead of 'getrecords'. The 'getrecords' method will
>>> be upgraded to use the 'getrecords2' parameters in a future version of
>>> OWSLib
>> That might be an issue with an incompatible version of OWSLib that got
>> installed when you upgraded the requirements, we've had some issues
>> with incompatibilities with owslib.
>>
>> What version of OWSLib do you have installed? Run the following with
>> your virtualenv activated and post the result:
>>
>
> For the record, this is a Python DeprecationWarning in OWSLib.  There
> have been some huge improvements to CSW in OWSLib (in
> owslib.csw.getrecords2, basically improved filter support), which will
> replace/become owslib.csw.getrecords).  Having said this, this is just
> a warning for downstream developers to update their use of OWSLib.
>
>
>> pip freeze | grep -i owslib
>>
>>> A workaround, but not solution, is here:
>>> https://www.seegrid.csiro.au/wiki/Infosrvices/CKANHarvestingGuide
>>> The workaround (not a fix) for the above error is to comment out the lines
>>> (186-188) that raised the DeprecationWarning exception in the following
>>> Python source file (/usr/lib/ckan/default/src/owslib/owslib/csw.py).
>>> #raise DeprecationWarning("""Please use the updated 'getrecords2' method
>>> instead of 'getrecords'. #The 'getrecords' method will be upgraded to use
>>> the 'getrecords2' parameters #in a future version of OWSLib.""")
>> Sounds like we should update our harvesters to use getrecords2. We
>> have never found this, so there definitely seems to be a conflict with
>> a newer version of OWSlib.
>
> ckanext-spatial devs:
>
> Agreed. From looking at https://github.com/okfn/ckanext-spatial and
> doing `grep -R getrecords *`, the only thing you have to change is
> your handling of typenames.
>
> In owslib.csw.getrecords, qtype is a helper to define what kind of CSW
> metadata to query for (default is 'dataset', others are 'service',
> etc.  This is loosely tied to dc:type or apiso:Type.
>
> In owslib.csw.getrecords2 (which will become owslib.csw.getrecords),
> you pass this as an OWSLib constraint object (see
> https://github.com/geopython/OWSLib/blob/master/owslib/csw.py#L284) in
> a list.
>
> I've updated my fork of ckanext-spatial per above:
> https://github.com/tomkralidis/ckanext-spatial/commit/1fdf0cde4c6feed2b3f0675ff88145dd4b626e6e
> (this is UNTESTED).  Should I submit this as a PR?  Do ckanext-spatial
> PRs run tests? Then I can submit PR.
>
>
>> We'll investigate, but we'll need to OWSLib version you are using that
>> you can find with the command I mentioned before.
>>
>>
>>> Anyway, if  I look at the harvest object like you described I don't know
>>> what is wrong with it. It is too big to post on the list.
>> Can you post it online somewhere and link to it? I'm curious to see
>> what might be causing the ckan-pycsw command to fail.
>>
>>
>>> I have also another problem, I cannot see the "Add harvest source" button on
>>> the
>>>
>>> http://{my-ckan-instance}/harvest
>>>
>>> Website. It has disapperared.
>> Make sure that you are using the latest "stable" branch on
>> ckanext-harvest, we fixed some problems with this a while ago:
>>
>> git checkout stable
>> git pull
>>
>> (and of course that you are logged in)
>>
>>
>>> Sorry, but I am getting so many issues at the same time.
>> Sorry about the troubles, hopefully we'll get there.
>>
>> Adrià
>>
>>
>>
>>> Hilde
>>>
>>>
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