def legend(request, layername, layertitle=False, style=None):
"""Get the legend from a layer.
:param layername: The layer name in Geonode.
:type layername: basestring
:param layertitle: Add the layer title in the legend. Default to False.
:type layertitle: bool
:param style: Layer style to choose
:type style: str
:return: The HTTPResponse with a PNG.
"""
layer = get_object_or_404(Layer, name=layername)
qgis_layer = get_object_or_404(QGISServerLayer, layer=layer)
# get default style name
if not style:
# generate style cache
if not qgis_layer.default_style:
try:
style_list(layer, internal=False)
except BaseException:
print 'Failed to fetch styles'
# refresh values
qgis_layer.refresh_from_db()
if qgis_layer.default_style:
style = qgis_layer.default_style.name
legend_path = QGIS_SERVER_CONFIG['legend_path']
legend_filename = legend_path % (qgis_layer.qgis_layer_name, style)
if not os.path.exists(legend_filename):
if not os.path.exists(os.path.dirname(legend_filename)):
os.makedirs(os.path.dirname(legend_filename))
url = legend_url(layer, layertitle, style=style, internal=True)
result = cache_request.delay(url, legend_filename)
# Attempt to run task synchronously
if not result.get():
# If not succeded, provides error message.
return HttpResponseServerError('Failed to fetch legend.')
if image_format(legend_filename) != 'png':
logger.error('%s is not valid PNG.' % legend_filename)
os.remove(legend_filename)
if not os.path.exists(legend_filename):
return HttpResponse('The legend could not be found.', status=409)
with open(legend_filename, 'rb') as f:
return HttpResponse(f.read(), content_type='image/png')
def tile(request, layername, z, x, y, style=None):
"""Get the tile from a layer.
:param layername: The layer name in Geonode.
:type layername: basestring
:param z: TMS coordinate, zoom parameter
:type z: int, str
:param x: TMS coordinate, longitude parameter
:type x: int, str
:param y: TMS coordinate, latitude parameter
:type y: int, str
:param style: Layer style to choose
:type style: str
:return: The HTTPResponse with a PNG.
"""
x = int(x)
y = int(y)
z = int(z)
layer = get_object_or_404(Layer, name=layername)
qgis_layer = get_object_or_404(QGISServerLayer, layer=layer)
# get default style name
if not style:
# generate style cache
if not qgis_layer.default_style:
try:
style_list(layer, internal=False)
except BaseException:
print 'Failed to fetch styles'
# refresh values
qgis_layer.refresh_from_db()
if qgis_layer.default_style:
style = qgis_layer.default_style.name
tile_path = QGIS_SERVER_CONFIG['tile_path']
tile_filename = tile_path % (qgis_layer.qgis_layer_name, style, z, x, y)
if not os.path.exists(tile_filename):
if not os.path.exists(os.path.dirname(tile_filename)):
os.makedirs(os.path.dirname(tile_filename))
# Use internal url
url = tile_url(layer, z, x, y, style=style, internal=True)
result = cache_request.delay(url, tile_filename)
# Attempt to run task synchronously
if not result.get():
# If not succeded, provides error message.
return HttpResponseServerError('Failed to fetch tile.')
if image_format(tile_filename) != 'png':
logger.error('%s is not valid PNG.' % tile_filename)
os.remove(tile_filename)
if not os.path.exists(tile_filename):
return HttpResponse('The tile could not be found.', status=409)
with open(tile_filename, 'rb') as f:
return HttpResponse(f.read(), content_type='image/png')