def fetch (self):
"""Retrieve the tile from the cache or load the cache and return"""
try:
# open file and return
f=open(self.filename)
self.db.touch(self.tkey)
return f.read()
except IOError:
pass
try:
self.initForFetch()
except OOBException:
logger.warning("OOB request. Returning black tile. url={}".format(self.tileurl))
img = Image.new("L", (512, 512))
fileobj = cStringIO.StringIO ( )
img.save ( fileobj, "PNG" )
fileobj.seek(0)
return fileobj.read()
# call the celery process to fetch the url
from ocptilecache.tasks import fetchurl
fetchurl.delay ( self.token, self.slicetype, self.channels, self.cuboidurl )
#fetchurl ( self.token, self.slicetype, self.channels, self.cuboidurl )
logger.warning("CATMAID tile fetch {}".format(self.tileurl))
try:
f = urllib2.urlopen ( self.tileurl )
except urllib2.URLError, e:
raise
for z in range(zlow,zhigh,zdim):
for y in range(ylow,yhigh,ydim):
for x in range(xlow,xhigh,xdim):
if zlow >= zhigh or ylow >= yhigh or xlow >= xhigh:
continue
# Build the URLs
cutout = '{}/{},{}/{},{}/{},{}'.format(level,x,min(x+xdim,ximagesize),y,min(y+ydim,yimagesize),z,min(z+zdim,zimagesize))
cuboidurl = "http://{}/ocpca/{}/npz/{}/".format(settings.SERVER,token,cutout)
print cuboidurl
# call the celery process to fetch the url
from ocptilecache.tasks import fetchurl
fetchurl.delay ( cuboidurl, info )
def main():
parser = argparse.ArgumentParser(description='Prefetch a volume ')
parser.add_argument('token', action="store")
parser.add_argument('cutout', action="store", help='Cutout arguments of the form resolution/x1,x2/y1,y2/z1,z2.', default=None)
result = parser.parse_args()
p = re.compile('^(\d+)/(\d+),(\d+)/(\d+),(\d+)/(\d+),(\d+).*$')
m = p.match(result.cutout)
[ res, xmin, xmax, ymin, ymax, zmin, zmax ] = map(int, m.groups())
prefetch ( result.token, res, xmin, xmax, ymin, ymax, zmin, zmax )