topic Re: Cherrypy with arcpy in Python Questions

Cherrypy with arcpy

Thanh_NgocDao — Thu, 19 Jan 2017 10:03:37 GMT

Hello everybody,

Currently i'm developing an API that do some basic calculation (polygon area ... ) using arcpy. I'm using bottle.py with cherrypy as webserver.

At first i used the WSGIRef (default webserver of bottle.py, single-thread) and everything is fine but after switching to cherrypy (multi-threaed webserver), my code suddenly went down, look closely in to my source code it fail in these line:

arcpy.env.workspace = OutputLocation

Have someone ever facing this problem before?

Re: Cherrypy with arcpy

FC_Basson — Fri, 10 Dec 2021 19:52:51 GMT

I think the cellSize line needs to refer to a cellsize value and not the raster. So you need to get the raster properties first to get the Elevation_Raster cellsize

cs = arcpy.GetRasterProperties_management(Elevation_Raster, "CELLSIZEX")‍‍‍
arcpy.env.cellSize = cs.getOutput(0)‍‍‍‍

Re: Cherrypy with arcpy

Thanh_NgocDao — Thu, 19 Jan 2017 10:16:35 GMT

Even though i remove that line, it still produce the same error on: arcpy.env.workspace = OutputLocation . That error never happen when i use old webserver. Thank you very much

Re: Cherrypy with arcpy

FC_Basson — Thu, 19 Jan 2017 10:20:19 GMT

Make sure the output location format is correct - see Dan Patterson‌'s blog /blogs/dan_patterson/2016/08/14/filenames-and-file-paths-in-python

Re: Cherrypy with arcpy

Thanh_NgocDao — Thu, 19 Jan 2017 10:41:23 GMT

I think it's correct Mr.Basson, because this code run fine with WSGIRef webserver, but can't work with cherrypy, i also print the output location and it still correct

Re: Cherrypy with arcpy

FC_Basson — Thu, 19 Jan 2017 10:54:31 GMT

So you've changed servers - is the output location still the same and a valid location?

Re: Cherrypy with arcpy

DanPatterson_Retired — Thu, 19 Jan 2017 10:57:19 GMT

does ... import arcpy .... work? If it doesn't, the location of arcmap and hence arcpy is unknown... if it does, do as fcbassongis‌ says

Re: Cherrypy with arcpy

Thanh_NgocDao — Thu, 19 Jan 2017 11:09:22 GMT

Yes, the import arcpy work Mr.Patterson

Re: Cherrypy with arcpy

DanPatterson_Retired — Thu, 19 Jan 2017 12:38:44 GMT

Good... now can you get a list of files in the folder/workspace? or examine the contents of a featureclass (ie ListFeatureClasses would be useful

Re: Cherrypy with arcpy

Thanh_NgocDao — Fri, 20 Jan 2017 01:54:51 GMT

In fact it raise the error at that step and the error is: AttributeError: ERROR 87934 ... As i know usually AttributeError is raised because there is no that attribute (env or workspace)

Re: Cherrypy with arcpy

Thanh_NgocDao — Fri, 20 Jan 2017 02:01:57 GMT

Yes, it's still the same and valid Mr.Basson. In fact it raise the error at that step and the error is: AttributeError: ERROR 87934 ... As i know usually AttributeError is raised because there is no that attribute (env or workspace)

Re: Cherrypy with arcpy

DanPatterson_Retired — Fri, 20 Jan 2017 03:08:00 GMT

so, to summarize,

arcpy imports fine, so arcpy can be seen
you say that the workspace if fine (correct?) but arcpy says otherwise...

then according to arcpy, it is not a valid workspace, so proceeding on to the next logical step of trying to query a folder or a geodatabase in the workspace isn't possible until that step is resolved. Does that pretty well summarize the state so far?

PS it wouldn't be one of those network induced absolute vs relative path issues would it?

Re: Cherrypy with arcpy

Thanh_NgocDao — Fri, 20 Jan 2017 03:36:26 GMT

I'm sorry if my comment is not clear. Here is the situation:

+ Arcpy import fine

+ arcpy.env.workspace = OutputLocation raise AttributeError, after a few search on Google somebody say that AttributeError occurs because that attribute is not exist (i mean there is no workspace attribute in env or there is no env attribute in arcpy). But the weird thing is that this code run fine if i use the WSGIRef webserver (single thread webserver) or run it as stand-alone script but after switching to Cherrypy webserver (multi-thread) my code does not work anymore and the stack trace point to this line: arcpy.env.workspace = OutputLocation

I have tried on both relative path and absolute path but it does not help.

P/S: There is an topic state that Arcpy does not compatible with multi-thread webserver, is it true ?

Re: Cherrypy with arcpy

DanPatterson_Retired — Fri, 20 Jan 2017 05:19:02 GMT

That thread would be a useful addition to the discussion... why don't you post the link. If it was found to be an issue or stated as one... good chance it isn't compatible or you need python 3.x or PRO or background processing installed. could be any combination of factors

Good luck

Re: Cherrypy with arcpy

Thanh_NgocDao — Fri, 20 Jan 2017 06:35:23 GMT

This is the thread i found:

https://community.esri.com/thread/99374

Currently i use Arcgis PRO with Python 3 but that error happen