/usr/lib/python2.7/dist-packages/cl/presence.py is in python-cl 0.0.3-1.
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from __future__ import absolute_import, with_statement
import warnings
from collections import defaultdict
from contextlib import contextmanager
from functools import wraps
from random import shuffle
from time import time, sleep
from kombu import Exchange, Queue
from kombu.common import ipublish
from kombu.log import LogMixin
from kombu.mixins import ConsumerMixin
from kombu.pools import producers
from kombu.utils.functional import promise
from .agents import Agent
from .g import spawn, timer
from .utils import cached_property, first_or_raise, shortuuid
class State(LogMixin):
logger_name = "cl.presence.state"
def __init__(self, presence):
self.presence = presence
self._agents = defaultdict(lambda: {})
self.heartbeat_expire = self.presence.interval * 2.5
self.handlers = {"online": self.when_online,
"offline": self.when_offline,
"heartbeat": self.when_heartbeat,
"wakeup": self.when_wakeup}
def can(self, actor):
able = set()
for id, state in self.agents.iteritems():
if actor in state["actors"]:
# remove the . from the agent, which means that the
# agent is a clone of another agent.
able.add(id.partition(".")[0])
return able
def meta_for(self, actor):
return self._agents["meta"][actor]
def update_meta_for(self, agent, meta):
self._agents[agent].update(meta=meta)
def agents_by_meta(self, predicate, *sections):
agents = self._agents
agent_ids = agents.keys()
# shuffle the agents so we don't get the same agent every time.
shuffle(agent_ids)
for agent in agent_ids:
d = agents[agent]["meta"]
for i, section in enumerate(sections):
d = d[section]
if predicate(d):
yield agent
def first_agent_by_meta(self, predicate, *sections):
for agent in self.agents_by_meta(predicate, *sections):
return agent
raise KeyError()
def on_message(self, body, message):
event = body["event"]
self.handlers[event](**body)
self.debug("agents after event recv: %s", promise(lambda: self.agents))
def when_online(self, agent=None, **kw):
self._update_agent(agent, kw)
def when_wakeup(self, **kw):
self.presence.send_heartbeat()
def when_heartbeat(self, agent=None, **kw):
self._update_agent(agent, kw)
def when_offline(self, agent=None, **kw):
self._remove_agent(agent)
def expire_agents(self):
expired = set()
for id, state in self._agents.iteritems():
if state and state.get("ts"):
if time() > state["ts"] + self.heartbeat_expire:
expired.add(id)
for id in expired:
self._remove_agent(id)
return self._agents
def update_agent(self, agent=None, **kw):
return self._update_agent(agent, kw)
def _update_agent(self, agent, kw):
kw = dict(kw)
meta = kw.pop("meta", None)
if meta:
self.update_meta_for(agent, meta)
self._agents[agent].update(kw)
def _remove_agent(self, agent):
self._agents[agent].clear()
def neighbors(self):
return {"agents": self.agents.keys()}
@property
def agents(self):
return self.expire_agents()
class Event(dict):
pass
class Presence(ConsumerMixin):
Event = Event
State = State
exchange = Exchange("cl.agents", type="topic", auto_delete=True)
interval = 10
_channel = None
g = None
def __init__(self, agent, interval=None, on_awake=None):
self.agent = agent
self.state = self.State(self)
self.interval = interval or self.interval
self.connection = agent.connection
self.on_awake = on_awake
def get_queue(self):
return Queue("cl.agents.%s" % (self.agent.id, ), self.exchange,
routing_key="#", auto_delete=True)
def get_consumers(self, Consumer, channel):
return [Consumer(self.get_queue(),
callbacks=[self.state.on_message], no_ack=True)]
def create_event(self, type):
return self.Event(agent=self.agent.id,
event=type,
actors=[actor.name for actor in self.agent.actors],
meta=self.meta(),
ts=time(),
neighbors=self.state.neighbors())
def meta(self):
return dict((actor.name, actor.meta) for actor in self.agent.actors)
@contextmanager
def extra_context(self, connection, channel):
self.send_online()
self.wakeup()
sleep(1.0)
if self.on_awake:
self.on_awake()
timer(self.interval, self.send_heartbeat)
self.agent.on_presence_ready()
yield
self.send_offline()
def _announce(self, event, producer=None):
producer.publish(event, exchange=self.exchange.name,
routing_key=self.agent.id)
def announce(self, event, **retry_policy):
return ipublish(producers[self.agent.connection],
self._announce, (event, ), **retry_policy)
def start(self):
self.g = spawn(self.run)
def send_online(self):
return self.announce(self.create_event("online"))
def send_heartbeat(self):
return self.announce(self.create_event("heartbeat"))
def send_offline(self):
return self.announce(self.create_event("offline"))
def wakeup(self):
event = self.create_event("wakeup")
self.state.update_agent(**event)
return self.announce(event)
def can(self, actor):
return self.state.can(actor)
@property
def logger_name(self):
return "Presence#%s" % (shortuuid(self.agent.id), )
@property
def should_stop(self):
return self.agent.should_stop
class AwareAgent(Agent):
def on_run(self):
self.presence.start()
def get_default_scatter_limit(self, actor):
able = self.presence.can(actor)
if not able:
warnings.warn("Presence running, but no agents available?!?")
return len(able) if able else None
def on_awake(self):
pass
def on_presence_ready(self):
pass
def lookup_agent(self, pred, *sections):
return self.presence.state.first_agent_by_meta(pred, *sections)
def lookup_agents(self, pred, *sections):
return self.presence.state.agents_by_meta(pred, *sections)
@cached_property
def presence(self):
return Presence(self, on_awake=self.on_awake)
class AwareActorMixin(object):
meta_lookup_section = None
def lookup(self, value):
if self.agent:
return self.agent.lookup_agent(lambda values: value in values,
self.name, self.meta_lookup_section)
def send_to_able(self, method, args={}, to=None, **kwargs):
actor = None
try:
actor = self.lookup(to)
except KeyError:
raise self.NoRouteError(to)
if actor:
return self.send(method, args, to=actor, **kwargs)
r = self.scatter(method, args, propagate=True, **kwargs)
if r:
return first_or_raise(r, self.NoRouteError(to))
def wakeup_all_agents(self):
if self.agent:
self.log.info("presence wakeup others")
self.agent.presence.wakeup()
def announce_after(fun):
@wraps(fun)
def _inner(self, *args, **kwargs):
try:
return fun(self, *args, **kwargs)
finally:
self.actor.wakeup_all_agents()
return _inner
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