def delete_caches(sender, instance, **kwargs):
_log.debug('Deleting caches for {0}'.format(instance.title))
if isinstance(instance, Style):
CacheManager.get().remove_caches_for_style(instance.slug)
elif isinstance(instance, Layer):
CacheManager.get().remove_caches_for_layer(instance.slug)
def delete_caches(sender, instance, **kwargs):
_log.debug('Deleting caches for {0}'.format(instance.title))
if isinstance(instance, Style):
CacheManager.get().remove_caches_for_style(instance.slug)
elif isinstance(instance, Layer):
CacheManager.get().remove_caches_for_layer(instance.slug)
def prepare_wms(self, layers, srs, styles, bgcolor=None, transparent=True, **kwargs):
"""Take a WMS query and turn it into the appropriate MML file, if need be. Or look up the cached MML file"""
_log.debug('prepare wms {0} {1}'.format(layers, styles))
if not os.path.exists(LAYER_CACHE_PATH):
os.makedirs(LAYER_CACHE_PATH) # just in case it's not there yet.
cached_filename = CacheManager.cache_entry_name(
layers, srs, styles,
bgcolor=bgcolor,
transparent=transparent,
query=kwargs['query'] if 'query' in kwargs else None
)
_log.debug('cache entry {0}'.format(cached_filename))
layer_specs = []
for layer in layers:
if "#" in layer:
layer, kwargs['sublayer'] = layer.split("#")
_log.debug('pulling layer {0}'.format(layer))
rendered_layer = models.Layer.objects.get(slug=layer)
driver = rendered_layer.data_resource.driver_instance
layer_spec = driver.get_rendering_parameters(**kwargs)
layer_specs.append((rendered_layer, layer_spec))
if not os.path.exists(cached_filename + ".xml"): # not an else as previous clause may remove file.
try:
with open(cached_filename + ".lock", 'w') as w:
self.compile_mapfile(cached_filename, srs, styles, *layer_specs)
os.unlink(cached_filename + ".lock")
except sh.ErrorReturnCode_1, e:
os.unlink(cached_filename + ".lock")
raise RuntimeError(str(e.stderr))
def tms(request, layer, z=None, x=None, y=None, **kwargs):
if z and x and y:
z = int(z)
x = int(x)
y = int(y)
table = None
if '#' in layer:
layer_slug, table = layer.split('#')
else:
layer_slug = layer
# dispatch.api_accessed.send(RenderedLayer, instance=layer_instance, user=user)
style = request.GET.get(
'style',
Layer.objects.get(slug=layer_slug).default_style.slug)
cache = CacheManager.get().get_tile_cache([layer], [style])
rendered, png = cache.fetch_tile(z, x, y)
_log.debug("returning tile {z}/{x}/{y} with size {png}".format(
z=z, x=x, y=y, png=len(png)))
rsp = HttpResponse(png, content_type='image/png')
rsp['Content-Disposition'] = 'attachment; filename="{z}.{x}.{y}.png"'.format(
z=z, x=x, y=y)
return rsp
else:
return HttpResponseRedirect(
reverse('layer-page', kwargs={'slug': layer}))
def seed_layer(request, layer):
mnz = int(request.GET['minz'])
mxz = int(
request.GET['maxz']
) # anything greater would cause a DOS attack. We should do it manually
mnx = int(request.GET['minx'])
mxx = int(request.GET['maxx'])
mny = int(request.GET['miny'])
mxy = int(request.GET['maxy'])
layer = Layer.objects.get(slug=layer)
style = request.GET.get('style', layer.default_style)
user = authorize(request, page=layer, edit=True)
dispatch.api_accessed.send(Layer, instance=layer, user=user)
CacheManager.get().get_tile_cache(layers=[layer],
styles=[style]).seed_tiles(
mnz, mxz, mnx, mny, mxx, mxy)
return HttpResponse()
def test_fetch_tile(layer):
mgr = CacheManager.get()
filename = mgr.cache_entry_name(styles=[layer.default_style.slug],
layers=[layer.slug])
if os.path.exists(filename + '.mbtiles'):
os.unlink(filename + '.mbtiles')
cc = mgr.get_tile_cache(
styles=[layer.default_style.slug],
layers=[layer.slug],
)
rendered, tile = cc.fetch_tile(0, 0, 0)
assert rendered
rendered, tile = cc.fetch_tile(0, 0, 0)
assert not rendered
with open('test_fetch_tile.0.0.0.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(1, 0, 0)
with open('test_fetch_tile.1.0.0.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(1, 1, 1)
with open('test_fetch_tile.1.1.1.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(2, 0, 0)
with open('test_fetch_tile.2.0.0.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(2, 1, 1)
with open('test_fetch_tile.2.1.1.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(2, 2, 2)
with open('test_fetch_tile.2.2.2.png', 'wb') as output:
output.write(tile)
def test_fetch_tile(layer):
mgr = CacheManager.get()
filename = mgr.cache_entry_name(styles=[layer.default_style.slug],
layers=[layer.slug])
if os.path.exists(filename + '.mbtiles'):
os.unlink(filename + '.mbtiles')
cc = mgr.get_tile_cache(
styles=[layer.default_style.slug],
layers=[layer.slug],
)
rendered, tile = cc.fetch_tile(0, 0, 0)
assert rendered
rendered, tile = cc.fetch_tile(0, 0, 0)
assert not rendered
with open('test_fetch_tile.0.0.0.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(1, 0, 0)
with open('test_fetch_tile.1.0.0.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(1, 1, 1)
with open('test_fetch_tile.1.1.1.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(2, 0, 0)
with open('test_fetch_tile.2.0.0.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(2, 1, 1)
with open('test_fetch_tile.2.1.1.png', 'wb') as output:
output.write(tile)
rendered, tile = cc.fetch_tile(2, 2, 2)
with open('test_fetch_tile.2.2.2.png', 'wb') as output:
output.write(tile)
def trim_tile_caches(sender, instance, *args, **kwargs):
if sender is Style:
CacheManager.get().remove_caches_for_style(instance)
elif sender is Layer:
CacheManager.get().remove_caches_for_layer(instance)
def shave_tile_caches(sender, instance, bbox, *args, **kwargs):
CacheManager.get().shave_caches(instance, bbox)
def trim_tile_caches(sender, instance, *args, **kwargs):
if sender is Style:
CacheManager.get().remove_caches_for_style(instance)
elif sender is Layer:
CacheManager.get().remove_caches_for_layer(instance)
def shave_tile_caches(sender, instance, bbox, *args, **kwargs):
CacheManager.get().shave_caches(instance, bbox)
