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Return None/null instead of crashing

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When there's no enough information to produce an isoline (less than 3
points) return a NULL multipolygon to the upper layer. This usually
happens when the matrix API returns null cost for most points in the
request.
This commit is contained in:
Rafa de la Torre
2016-07-11 14:59:02 +02:00
parent aafacc3af7
commit 9f4df6fa7d
1 changed files with 10 additions and 7 deletions
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17
server/extension/sql/80_isolines_helper.sql
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@@ -93,20 +93,23 @@ RETURNS SETOF cdb_dataservices_server.isoline AS $$
if isotype == 'isodistance':
for r in data_range:
isoline = mapzen_isolines.calculate_isodistance(origin, mode, r)
isolines[r] = (isoline)
isolines[r] = isoline
elif isotype == 'isochrone':
for r in data_range:
isoline = mapzen_isolines.calculate_isochrone(origin, mode, r)
isolines[r] = (isoline)
isolines[r] = isoline
result = []
for r in data_range:
# -- TODO encapsulate this block into a func/method
locations = isolines[r] + [ isolines[r][0] ] # close the polygon repeating the first point
wkt_coordinates = ','.join(["%f %f" % (l['lon'], l['lat']) for l in locations])
sql = "SELECT ST_MPolyFromText('MULTIPOLYGON((({0})))', 4326) as geom".format(wkt_coordinates)
multipolygon = plpy.execute(sql, 1)[0]['geom']
if len(isolines[r]) >= 3:
# -- TODO encapsulate this block into a func/method
locations = isolines[r] + [ isolines[r][0] ] # close the polygon repeating the first point
wkt_coordinates = ','.join(["%f %f" % (l['lon'], l['lat']) for l in locations])
sql = "SELECT ST_MPolyFromText('MULTIPOLYGON((({0})))', 4326) as geom".format(wkt_coordinates)
multipolygon = plpy.execute(sql, 1)[0]['geom']
else:
multipolygon = None
result.append([source, r, multipolygon])