def render(self, request):
logger.log_debug("%s %s" % (request.method, request.path))
logger.log_debug(str(request.args))
try:
# get session id
sid = request.args.get("session-id", ["0"])
sid = int(sid[0])
if sid == 0 or not sid in self.service.sessions:
raise Exception("session-id %i is invalid" % sid)
# get revision number
rid = request.args.get("revision-number", ["0"])
rid = int(rid[0])
logger.log_debug("UpdateCommand: revision-number is %i" % rid)
# if revision-number is not current revision number
if not rid == DaapPrivate.REVISION_NUMBER:
if rid < 0:
raise Exception("invalid revision-number %s" % rid)
# return the current revision number
mupd = CodeBag("mupd")
mupd.add(ContentCode("mstt", 200))
mupd.add(ContentCode("musr", int(DaapPrivate.REVISION_NUMBER)))
return Response(200, {"content-type": x_dmap_tagged}, mupd.render())
# create a new update stream to listen for db-changed signal
stream = UpdateStream(self.service)
return Response(200, {"content-type": x_dmap_tagged}, stream)
except Exception, e:
logger.log_error("UpdateCommand failed: %s" % e)
return Response(400, {"content-type": MimeType("text", "plain")}, str(e))
def _render(self, revision):
if revision > 0:
logger.log_debug("UpdateStream: new revision is %i" % revision)
else:
logger.log_debug("UpdateStream: signaling disconnect (revision %i)" % revision)
# if _caughtUpdate was not called, then disconnect from the signal
if self._signal:
db_changed.disconnect(self._signal)
self._signal = None
# delete the reference to self.deferred
self.deferred = None
self.length = 0
# remove stream from service.streams
del self._service.streams[self]
# write response
mupd = CodeBag("mupd")
mupd.add(ContentCode("mstt", 200))
mupd.add(ContentCode("musr", int(revision)))
return str(mupd.render())
