def _tileFromHash(cls, item, x, y, z, mayRedirect=False, **kwargs):
tileCache, tileCacheLock = getTileCache()
if tileCache is None:
return None
if 'largeImage' not in item:
return None
if item['largeImage'].get('expected'):
return None
sourceName = item['largeImage']['sourceName']
try:
sourceClass = girder_tilesource.AvailableGirderTileSources[
sourceName]
except TileSourceException:
return None
classHash = sourceClass.getLRUHash(item, **kwargs)
tileHash = sourceClass.__name__ + ' ' + classHash + ' ' + strhash(
classHash) + strhash(*(x, y, z), mayRedirect=mayRedirect, **kwargs)
try:
if tileCacheLock is None:
tileData = tileCache[tileHash]
else:
with tileCacheLock:
tileData = tileCache[tileHash]
tileMime = TileOutputMimeTypes.get(kwargs.get('encoding'),
'image/jpeg')
return tileData, tileMime
except (KeyError, ValueError):
return None
def getLRUHash(*args, **kwargs):
return strhash(
super(TestTileSource, TestTileSource).getLRUHash(
*args, **kwargs),
kwargs.get('minLevel'), kwargs.get('maxLevel'),
kwargs.get('tileWidth'), kwargs.get('tileHeight'),
kwargs.get('fractal'))
def _handleETag(key, item, *args, **kwargs):
"""
Add or check an ETag header.
:param key: key for making a distinc etag.
:param item: item used for the item _id and updated timestamp.
:param *args, **kwargs: additional arguments for generating an etag.
"""
etag = hashlib.md5(strhash(key, str(item['_id']), *args, **kwargs).encode()).hexdigest()
setResponseHeader('ETag', etag)
conditions = [str(x) for x in cherrypy.request.headers.elements('If-Match') or []]
if conditions and not (conditions == ['*'] or etag in conditions):
raise cherrypy.HTTPError(
412, 'If-Match failed: ETag %r did not match %r' % (etag, conditions))
conditions = [str(x) for x in cherrypy.request.headers.elements('If-None-Match') or []]
if conditions == ['*'] or etag in conditions:
raise cherrypy.HTTPRedirect([], 304)
# Explicitly set a max-ago to recheck the cahe after a while
setResponseHeader('Cache-control', 'max-age=600')
def getLRUHash(*args, **kwargs):
return strhash(
super(PILFileTileSource,
PILFileTileSource).getLRUHash(*args, **kwargs),
kwargs.get('maxSize'))