def get_discovery(self):
"""
Hitting the "discovery" button on the UI triggers this generator.
Run a discovery for everything connected to this protocol and return a list of of all connected:
items, messages, and endpoint types
"""
print "----------------------------"
print "Discovery function started!"
print "----------------------------"
t1 = time.time()
# If there is a deferred item, yield that first
if self._attached_item_d is not None:
yield self._attached_item_d
# If we were already in the process of a discovery we should
# return a deferred object.
if self._in_progress:
defer.returnValue(self._discovery_deferred)
self._in_progress = True
self.items = []
for subsystem_id in self._subsystem_ids:
try:
yield self._get_item_discovery_info(subsystem_id)
except Exception as e:
print("Exception while discovering! Skipping subsystem : " + str(subsystem_id) + "\n " + str(e))
self._in_progress = False
t2 = time.time()
print "Discovery took", (t2 - t1), "seconds"
# At this point self.items should be populated with
# the ParlayStandardItem objects that represent the items we discovered.
# By calling BaseProtocol's get_discovery() function we can get that information
# to the adapter and furthermore to the broker.
defer.returnValue(BaseProtocol.get_discovery(self))
