def __call__(self, environ, start_response):
"""Invoke the Controller"""
# WSGIController.__call__ dispatches to the Controller method
# the request is routed to. This routing information is
# available in environ['pylons.routes_dict']
try:
return WSGIController.__call__(self, environ, start_response)
finally:
Session.remove()
def is_empty(self):
"""With attributes set on self, return a boolean.
Calc lat/lng bounds of this tile (include half-dot-width of padding)
SELECT count(uid) FROM points
"""
q = Session.query(Points)
q = q.filter(Points.latitude <= self.llbound[0])
q = q.filter(Points.latitude >= self.llbound[1])
q = q.filter(Points.longitude <= self.llbound[2])
q = q.filter(Points.longitude >= self.llbound[3])
numpoints = q.count() # this is guaranteed to exist, right?
return numpoints == 0
def is_stale(self):
"""With attributes set on self, return a boolean.
Calc lat/lng bounds of this tile (include half-dot-width of padding)
SELECT count(uid) FROM points WHERE modtime < modtime_tile
"""
if not os.path.isfile(self.fspath):
return True
timestamp = os.stat(self.fspath)[stat.ST_MTIME]
modtime = datetime.datetime.fromtimestamp(timestamp)
q = Session.query(Points)
q = q.filter(Points.latitude <= self.llbound[0])
q = q.filter(Points.latitude >= self.llbound[1])
q = q.filter(Points.longitude <= self.llbound[2])
q = q.filter(Points.longitude >= self.llbound[3])
q = q.filter(Points.modtime > modtime)
numpoints = q.count() # this is guaranteed to exist, right?
return numpoints != 0
def rebuild(self):
"""Rebuild the image at self.img. Real work delegated to subclasses.
"""
# Calculate points.
# =================
# Build a closure that gives us the x,y pixel coords of the points
# to be included on this tile, relative to the top-left of the tile.
q = Session.query(Points)
q = q.filter(Points.latitude <= self.llbound[0])
q = q.filter(Points.latitude >= self.llbound[1])
q = q.filter(Points.longitude <= self.llbound[2])
q = q.filter(Points.longitude >= self.llbound[3])
def points():
"""Yield x,y pixel coords within this tile, top-left of dot.
"""
for point in q.all():
x, y = gmerc.ll2px(point.latitude, point.longitude, self.zoom)
x = x - self.x1 # account for tile offset relative to
y = y - self.y1 # overall map
yield x-self.pad,y-self.pad,point.magnitude
# Main logic
# ==========
# Hand off to the subclass to actually build the image, then come back
# here to maybe create a directory before handing back to the backend
# to actually write to disk.
self.img = self.hook_rebuild(points())
dirpath = os.path.dirname(self.fspath)
if dirpath and not os.path.isdir(dirpath):
os.makedirs(dirpath, 0755)
def init_model(engine):
"""Call me before using any of the tables or classes in the model"""
Session.configure(bind=engine)
