topic Re: Search standalone server services through ArcGIS API for Python in ArcGIS JavaScript Maps SDK Questions

Search standalone server services through ArcGIS API for Python

shapo — Wed, 07 Apr 2021 21:03:02 GMT

Does anyone know how to search services, such as a Feature Layer, on a standalone ArcGIS server through ArcGIS API for Python? For example, I am trying to access and list services published at https://geoappext.nrcan.gc.ca/arcgis/rest/services/ by using gis.content.search but with no luck.

I have been using this code:

gis = GIS()
items = gis.content.search(query="NRCAN",item_type="Feature Layer", max_items=10000)

I do get some of the services back as items but 'search' casts a too wide net, grabbing services that are not on that server as well, which then due to the max_items cap of 10,000 results in many of the services on the stated server not caught and returned as items. I would like to have only the feature layer services on the stated server returned as items, no other services.

Any help would be much appreciated, thank you.

Re: Search standalone server services through ArcGIS API for Python

jcarlson — Wed, 07 Apr 2021 21:56:16 GMT

What you want is the ServicesDirectory class. With it, you can iterate over the server's folders and return the services.

There is a "find" method, but repeated tests don't return reliable results. There's also a "report" method that returns the services in a folder as a Pandas DataFrame, which sounds ideal, but I haven't gotten that to return anything useful, either.

In any case, you can simply iterate over the entire server and populate a list of services, then search that.

from arcgis.gis.server.catalog import ServicesDirectory s = ServicesDirectory('https://geoappext.nrcan.gc.ca/arcgis/rest/services/') full_list = [] for f in s.folders: for svc in s.list(folder=f): full_list.append(svc) full_list

Returns

[<MapImageLayer url:"https://geoappext.nrcan.gc.ca/arcgis/rest/services//BaseMaps/CBCT3978/MapServer">,
 <MapImageLayer url:"https://geoappext.nrcan.gc.ca/arcgis/rest/services//BaseMaps/CBCT_TXT_3857/MapServer">,
 <MapImageLayer url:"https://geoappext.nrcan.gc.ca/arcgis/rest/services//BaseMaps/CBCT_TXT_3978/MapServer">,
 <MapImageLayer url:"https://geoappext.nrcan.gc.ca/arcgis/rest/services//BaseMaps/CBME_CBCE_HS_RO_3978/MapServer">,
 <MapImageLayer url:"https://geoappext.nrcan.gc.ca/arcgis/rest/services//BaseMaps/CBMT3978/MapServer">,
 <MapImageLayer url:"https://geoappext.nrcan.gc.ca/arcgis/rest/services//BaseMaps/CBMT_CBCT_GEOM_3857/MapServer">,
 <MapImageLayer url:"https://geoappext.nrcan.gc.ca/arcgis/rest/services//BaseMaps/CBMT_CBCT_GEOM_3978/MapServer">,
...

You can then search through that list for specific items.

Bonus points: use list comprehension to compile the list in one line:

[svc for sublist in [s.list(f) for f in s.folders] for svc in sublist]

Re: Search standalone server services through ArcGIS API for Python

shapo — Thu, 08 Apr 2021 01:16:06 GMT

Perfect! Thank you very much, Josh, this is exactly what I was looking for. I spent so much time this morning to find a solution so this is greatly appreciated! I did play with the ServiceDirectory class but I obviously wasn't using the right syntax.

Thanks again!

Tomislav