def publish_message(request, tutalk_message):
"""sends a message to tutalk via redis pub/sub
not all 'Rimac' messages are valid 'TuTalk' messages. The message
types in SHOULDNT_PUBLISH_MESSAGE_TYPES should merely be logged.
also adds the uid and gid fields, so the client doesn't need to
pass them
FIXME? I suppose ideally, rimac system should only deal with
'Rimac' messages, and there should be a rimac<->tutalk message
translation layer. rimac-event-listener partially does this for
messages originating from tutalk, but it would probably be better
if it instead translated them into rimac-specific message types
rather than simply adding more information to the payload
"""
msg_type = tutalk_message.get('type', None)
if msg_type is None:
raise exc.MsgMissingTypeException()
try:
add_uid_gid_fields(request, tutalk_message)
except Exception:
raise exc.NoUidInSessionException()
db.log_message(request, tutalk_message)
if should_publish_message(msg_type):
if "logout" == msg_type:
# we don't want to recieve any messages other than the
# corresponding tutor-logout
delete_mailbox(request)
rc = get_redis_connection()
tutalk_host = encode_tutalk_host(request.session['tutalk_host'])
routing_key = '%s.%s.%s.%s' % (tutalk_host,
request.session['experimenter'],
request.session['scenario'],
msg_type)
msg = json.dumps(tutalk_message)
LOGGER.debug("attempting to publish %s", routing_key)
LOGGER.debug("message: %s", msg)
success = rc.publish(routing_key, msg)
if 0 == success:
raise exc.ScenarioNotRunningException()
def logged_in_to_tutalk(request):
"""checks the redis database that the user is logged in.
FIXME? should I be double-checking with tutalk itself?
"""
found = False
tutalk_host = encode_tutalk_host(request.session['tutalk_host'])
experimenter = request.session['experimenter']
scenario = request.session['scenario']
top_level_key = '%s.scenarios' % tutalk_host
groups_key = '%s.%s.groups' % (experimenter, scenario)
rc = get_redis_connection()
val = rc.hget(top_level_key, groups_key)
if val is not None:
groups = json.loads(val)
for group in groups:
for agent in group['agents']:
if agent['uid'] == request.session['tutalk_uid']:
found = True
break
return found
