def layer_parsing_test(self):
"""Check layer parsing works correctly."""
mapnik_config = config["layers"]["mapnik"]
layer = MapLayer(layerId="mapnik", config=mapnik_config)
self.assertEqual(layer.id, "mapnik")
self.assertEqual(layer.label, "Mapnik (default)")
self.assertEqual(layer.url, "http://c.tile.openstreetmap.org/")
self.assertEqual(layer.type, "png")
self.assertEqual(layer.max_zoom, 18)
self.assertEqual(layer.min_zoom, 0)
self.assertEqual(layer.folder_name, "OpenStreetMap I")
self.assertEqual(layer.group_id, "osm")
self.assertEqual(layer.icon, "mapnik")
self.assertEqual(layer.timeout, 240.5)
expected_dict = {
"id": "mapnik",
"label": "Mapnik (default)",
"url": "http://c.tile.openstreetmap.org/",
"type": "png",
"max_zoom": 18,
"min_zoom": 0,
"folder_name": "OpenStreetMap I",
"coordinates": "osm",
"group_id": "osm",
"icon": "mapnik",
"timeout": 240.5
}
self.assertDictEqual(layer.dict, expected_dict)
def _getFallbackLayer(self):
"""In case that loading the map configuration
file fails, this Mapnik layer can be used as a fallback.
"""
return MapLayer(layerId="mapnik",
config={
'label': "OSM Mapnik",
'url': "http://c.tile.openstreetmap.org",
'max_zoom': 18,
'min_zoom': 0,
'folder_prefix': "OpenStreetMap I",
'coordinates': "osm"
})
def _parseLayers(self):
"""Parse all map layer definitions"""
# check if there is at least one valid layer
layerDefinitions = self.modrana.configs.map_config.get('layers', {})
for layerId, layerDefinition in six.iteritems(layerDefinitions):
if self._hasRequiredKeys(layerDefinition, MAP_LAYER_REQUIRED_KEYS):
self._layers[layerId] = MapLayer(layerId, layerDefinition)
else:
self.log.error('layer %s definition is missing required keys',
layerId)
if self._layers == {}:
self.log.error('map layer config has no valid layers,'
' using Mapnik fallback layer')
self._layers['mapnik'] = self._getFallbackLayer()