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Hippolyzer/pyogp/lib/base/event_queue.py

378 lines
12 KiB
Python

"""
@file event_queue.py
@date 2009-02-09
Contributors can be viewed at:
http://svn.secondlife.com/svn/linden/projects/2008/pyogp/CONTRIBUTORS.txt
$LicenseInfo:firstyear=2008&license=apachev2$
Copyright 2008, Linden Research, Inc.
Licensed under the Apache License, Version 2.0 (the "License").
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
or in
http://svn.secondlife.com/svn/linden/projects/2008/pyogp/LICENSE.txt
$/LicenseInfo$
"""
# standard python libs
from logging import getLogger, CRITICAL, ERROR, WARNING, INFO, DEBUG
# related
from eventlet import api, util
# the following makes socket calls nonblocking. magic
util.wrap_socket_with_coroutine_socket()
# pyogp
from pyogp.lib.base.utilities.events import Event
from pyogp.lib.base.groups import ChatterBoxInvitation_Message
# messaging
from pyogp.lib.base.message.packet import UDPPacket
from pyogp.lib.base.message.template_dict import TemplateDictionary
from pyogp.lib.base.message.template import MsgData, MsgBlockData, MsgVariableData
# initialize logging
logger = getLogger('pyogp.lib.base.event_queue')
log = logger.log
class EventQueueClient(object):
""" handles an event queue of either an agent domain or a simulator
Initialize the event queue client class
>>> client = EventQueueClient()
The event queue client requires an event queue capability
>>> from pyogp.lib.base.caps import Capability
>>> cap = Capability('EventQueue', http://localhost:12345/cap)
>>> event_queue = EventQueueClient(cap)
>>> event_queue.start()
Sample implementations: region.py
Tests: tests/test_event_queue.py
"""
def __init__(self, capability = None, settings = None, packet_handler = None, region = None, event_queue_handler = None):
""" set up the event queue attributes """
# allow the settings to be passed in
# otherwise, grab the defaults
if settings != None:
self.settings = settings
else:
from pyogp.lib.base.settings import Settings
self.settings = Settings()
# allow the packet_handler to be passed in
# otherwise, grab the defaults
if packet_handler != None:
self.packet_handler = packet_handler
elif self.settings.HANDLE_PACKETS:
from pyogp.lib.base.message.packethandler import PacketHandler
self.packet_handler = PacketHandler(settings = self.settings)
# allow the event_queue_handler to be passed in
# otherwise, grab the defaults
if event_queue_handler != None:
self.event_queue_handler = event_queue_handler
elif self.settings.HANDLE_EVENT_QUEUE_DATA:
self.event_queue_handler = EventQueueHandler(settings = self.settings)
self.region = region
self.cap = capability
#self.type = eq_type # specify 'agentdomain' or 'region'
self._running = False # this class controls this value
self.stop = False # client can pause the event queue
self.last_id = -1
# if applicable, initialize data to post to the event queue
self.data = {}
# stores the result of the post to the event queue capability
self.result = None
# enables proper packet parsing in event queue responses
self.template_dict = TemplateDictionary()
self.current_template = None
def start(self):
try:
if self.cap.name == 'event_queue':
api.spawn(self._processADEventQueue)
return True
elif self.cap.name == 'EventQueueGet':
api.spawn(self._processRegionEventQueue)
return True
else:
# ToDo handle this as an exception
log(WARNING, 'Unable to start event queue polling due to %s' % ('unknown queue type'))
return False
except:
return False
def stop(self):
log(INFO, "Stopping %s event queue." % (self.type))
self.stop = True
# ToDo: turn this into a timeout
for i in range(1,10):
if self._running == False: return True
# well, we failed to stop. let's log it and get outta here
log(WARNING, "Failed to stop %s event queue." % (self.type))
self.stop = False
return False
def _handle(self, data):
""" essentially a case statement to pass packets to event notifiers in the form of self attributes """
try:
# Handle the event queue result if we have subscribers
if len(self.subscribers) > 0:
log(DEBUG, 'Handling event queue results')
handler(data)
except AttributeError:
#log(INFO, "Received an unhandled packet: %s" % (packet.name))
pass
def _processRegionEventQueue(self):
if self.cap.name != 'EventQueueGet':
raise exc.RegionCapNotAvailable('EventQueueGet')
# well then get it...?
else:
self._running = True
while self.stop != True:
api.sleep(self.settings.REGION_EVENT_QUEUE_POLL_INTERVAL)
if self.last_id != -1:
self.data = {'ack':self.last_id, 'done':True}
if self.settings.ENABLE_EQ_LOGGING: log(DEBUG, 'Posting to the event queue: %s' % (self.data))
try:
self.result = self.cap.POST(self.data)
except Exception, error:
log(INFO, "Received an error we ought not care about: %s" % (error))
pass
if self.result != None:
self.last_id = self.result['id']
else:
self.last_id = -1
self._parse_result(self.result)
self._running = False
log(DEBUG, "Stopped event queue processing for %s" % (self.region.SimName))
def _processADEventQueue(self):
if self.cap.name != 'event_queue':
raise RegionCapNotAvailable('event_queue')
# change the exception here (add a new one)
else:
self._running = True
while not self.stop:
api.sleep(self.settings.agentdomain_event_queue_interval)
self.result = self.capabilities['event_queue'].POST(self.data)
if self.result != None: self.last_id = self.result['id']
self._parse_result(self.result)
self._running = False
def _parse_result(self, data):
# if there are subscribers to the event queue and packet handling is enabled
if self.settings.HANDLE_PACKETS: # and (len(self.handler) > 0):
try:
if data != None:
if self.settings.ENABLE_EQ_LOGGING: log(DEBUG, 'Event Queue result: %s' % (data))
# if we are handling packets, handle the packet so any subscribers can get the data
if self.settings.HANDLE_PACKETS:
# this returns packets
parsed_data = self._decode_eq_result(data)
for packet in parsed_data:
self.packet_handler._handle(packet)
except Exception, error:
log(WARNING, "Error parsing even queue results, data was: %s" % (data))
def _decode_eq_result(self, data=None):
""" parse the event queue data, return a list of packets
the building of packets borrows absurdly much from UDPDeserializer.__decode_data()
"""
# ToDo: this is returning packets, but perhaps we want to return packet class instances?
if data != None:
packets = []
if data.has_key('events'):
for i in data:
if i == 'id':
last_id = data[i]
else:
for message in data[i]:
# move this to a proper solution, for now, append to some list eq events
# or some dict mapping name to action to take
if message['message'] == 'ChatterBoxInvitation':
message['name'] = message['message']
group_chat = ChatterBoxInvitation_Message(ChatterBoxInvitation_Data = message['body'])
self.event_queue_handler._handle(group_chat)
else:
# this is a UDP packet sent over the event queue
self.current_template = self.template_dict.get_template(message['message'])
message_data = MsgData(self.current_template.name)
# treat this like a UDPPacket
# in some cases, we will be creating UDPPacket instances
# where there is no corresponding entry in the message_template
# hence the try: except:
# there must be a better solution
packet = UDPPacket(message_data)
packet.name = self.current_template.name
# irrelevant packet attributes since it's from the EQ
'''
packet.send_flags
packet.packet_id
packet.add_ack
packet.reliable
'''
for block_name in message['body']:
# block_data keys off of block.name, which here is the body attribute
block_data = MsgBlockData(block_name)
message_data.add_block(block_data)
for items in message['body'][block_name]:
for variable in items:
var_data = MsgVariableData(variable, items[variable], -1)
block_data.add_variable(var_data)
packet.message_data = message_data
packets.append(packet)
return packets
class EventQueueHandler(object):
""" general class handling individual packets """
def __init__(self, settings = None):
""" i do nothing """
# allow the settings to be passed in
# otherwise, grab the defaults
if settings != None:
self.settings = settings
else:
from pyogp.lib.base.settings import Settings
self.settings = Settings()
self.handlers = {}
def _register(self, name):
if self.settings.LOG_VERBOSE: log(DEBUG, 'Creating a monitor for %s' % (name))
return self.handlers.setdefault(name, EventQueueReceivedNotifier(name, self.settings))
def is_packet_handled(self, name):
""" if the data is being monitored, return True, otherwise, return False
this can allow us to skip parsing inbound packets if no one is watching a particular one
"""
try:
handler = self.handlers[name]
return True
except KeyError:
return False
def _handle(self, data):
""" essentially a case statement to pass packets to event notifiers in the form of self attributes """
try:
handler = self.handlers[data.name]
# Handle the packet if we have subscribers
# Conveniently, this will also enable verbose packet logging
if len(handler) > 0:
if self.settings.LOG_VERBOSE: log(DEBUG, 'Handling event queue data : %s' % (data.name))
handler(data)
except KeyError:
#log(INFO, "Received an unhandled packet: %s" % (packet.name))
pass
class EventQueueReceivedNotifier(object):
""" received TestMessage packet """
def __init__(self, name, settings):
self.event = Event()
self.name = name
self.settings = settings
def subscribe(self, *args, **kwdargs):
self.event.subscribe(*args, **kwdargs)
def received(self, data):
self.event(data)
def unsubscribe(self, *args, **kwdargs):
self.event.unsubscribe(*args, **kwdargs)
if self.settings.LOG_VERBOSE: log(DEBUG, "Removed the monitor for %s by %s" % (args, kwdargs))
def __len__(self):
return len(self.event)
__call__ = received