def downloader_worker():
lambda_result = awslambda.generate_cartogram(
map_handler.gen_area_data(areas),
map_handler.get_gen_file(), settings.CARTOGRAM_LAMBDA_URL,
settings.CARTOGRAM_LAMDA_API_KEY, unique_key)
cartogram_gen_output = lambda_result['stdout']
q.put(cartogram_gen_output)
def cartogram():
if 'handler' not in request.form:
return Response('{"error":"badrequest"}',
status=400,
content_type="application/json")
if request.form['handler'] not in cartogram_handlers:
return Response('{"error":"badhandler"}',
status=404,
content_type="application/json")
handler = request.form['handler']
cartogram_handler = cartogram_handlers[handler]
if 'values' not in request.form:
return Response('{"error":"badrequest"}',
status=400,
content_type="application/json")
values = request.form['values'].split(";")
# The existing verificaiton code expects all floats. To avoid modifying it, we replace the string "NA" with the
# number 0.0 for verification purposes only.
values_to_verify = []
try:
for i in range(len(values)):
if values[i] == "NA":
values_to_verify.append(0.0)
else:
values[i] = float(values[i])
values_to_verify.append(values[i])
except ValueError:
return Response('{"error":"badvalues"}',
status=400,
content_type="application/json")
if cartogram_handler.validate_values(values_to_verify) != True:
return Response('{"error":"badvalues"}',
status=400,
content_type="application/json")
unique_sharing_key = ""
if 'unique_sharing_key' in request.form:
unique_sharing_key = request.form['unique_sharing_key']
lambda_result = awslambda.generate_cartogram(
cartogram_handler.gen_area_data(values),
cartogram_handler.get_gen_file(), settings.CARTOGRAM_LAMBDA_URL,
settings.CARTOGRAM_LAMDA_API_KEY, unique_sharing_key)
cartogram_gen_output = lambda_result['stdout']
if cartogram_handler.expect_geojson_output():
# Just confirm that we've been given valid JSON. Calculate the extrema if necessary
cartogram_json = json.loads(cartogram_gen_output)
if "bbox" not in cartogram_json:
cartogram_json["bbox"] = geojson_extrema.get_extrema_from_geojson(
cartogram_json)
else:
cartogram_json = gen2dict.translate(io.StringIO(cartogram_gen_output),
settings.CARTOGRAM_COLOR,
cartogram_handler.remove_holes())
cartogram_json['unique_sharing_key'] = unique_sharing_key
if settings.USE_DATABASE:
cartogram_entry = CartogramEntry.query.filter_by(
string_key=unique_sharing_key).first()
if cartogram_entry != None:
cartogram_entry.cartogram_data = json.dumps(cartogram_json)
db.session.commit()
return Response(json.dumps({'cartogram_data': cartogram_json}),
content_type='application/json',
status=200)