I just wanted to drop a note about a new app that I deployed.
I recently launched a prototype and users are happy.
Basically it uses the gamespy API to query gamespy for a list of active
game servers, then contacts each server in turn to obtain critical
stats (map being player, number of players, scores....)
Players can come to the website and reserve a particular server for a
number of hours.
The players then get a unique URL that they can pass around. Going to
the URL will start the game and connect you to the reserved server.
All that happens in 121 python statements outside of django (according
to pylint).
All of the heavy lifting (gamespy, activeX, apache/http) was done in C,
but all of the business logic was handled in Python.
After this little project I'm starting to get the model API.
I thought this bit was tricky, so I'll share:
English:
If you try to make a reservation but that server is already reserved
for any part of the time period then that reservation should fail,
unless you are the person that made the original reservation.
Django:
class Reservation(meta.Model):
....
def _pre_save(self):
'''A server is already reserved if there is another reservation
with a start of end date in the
same range as the new reservation'''
from django.models.regservers import AlreadyReserved,
reservations, servers
from django.core.meta import Q
server = servers.get_object(id__exact=self.server_id)
blockers = server.get_reservation_list(complex=(
Q(start__range=(self.start,self.end)) |
Q(end__range=(self.start,self.end)) ) )
# custom logic to determine if I need to stop the reservation
blockers = [b for b in blockers if b.user <> self.user]
if len(blockers)>0:
raise AlreadyReserved(blockers)
It needs a little finishing, like transactional support and error
handling - but so far the system works really well and is agile in
every sense of the word.
Thanks again,
-Aaron Held
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