I need to create a Web Processing service on GeoServer (2.11.2) that triggers a
back-end Python script. This script should be able to utilize requests and
other packages necessary to do the job.
I have got the wps extension and all necessary GeoScript plugins installed with
GeoServer.
I followed an example as below to create a custom script that can be called
from the Admin Web Console WPS Request Builder.
http://suite.opengeo.org/opengeo-docs/processing/scripting/processcreate.html
import math, sys
from geoserver.wps import process
from geoscript.geom import Point
from geoscript.feature import Feature
from geoscript.layer import Layer
@process(
title = 'Distance and Bearing',
description = 'Computes Cartesian distance and bearing from features to an
origin.' + str(sys.executable),
inputs = {
'origin': (Point, 'Origin from which to calculate distance and bearing.'),
'features': (Layer, 'Features to which distance and bearing should be
calculated.')
},
outputs = {
'result': (Layer, 'Features with calculated distance and bearing
attributes.')
}
)
def run(origin, features):
for f in features.features():
p = f.geom.centroid
d = p.distance(origin)
b = 90 - math.degrees(math.atan2(p.y - origin.y, p.x - origin.x))
yield Feature({'point': p, 'distance': d, 'bearing': b})
I tried to use Python's sys library and print out sys.executable as a testing
process, but the output was NoneType.
I also tried to import requests but the GeoServer logs showed requests cannot
be found.
I am wondering whether arbitrary Python packages e.g. Requests can be used in a
script as such supported by GeoServer WPS. Are there any limitations for Python
scripts that can be triggered as Web Processing Service by GeoServer?
Thanks!------------------------------------------------------------------------------
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