class LocalNode(BaseNode):
def __init__(self, router=None):
BaseNode.__init__(self)
self._own_router = True
if router is not None:
self._local_router = router
self._own_router = False
else:
self._local_router = LocalRouter(get_sys_name())
self._channel_id_pool = IDPool()
def start_node(self):
BaseNode.start_node(self)
if self._own_router:
self._local_router.start()
def stop_node(self):
if self.running:
if self._own_router:
self._local_router.stop()
self.running = False
def _new_transport(self, ch_number=None):
trans = LocalTransport(self._local_router, ch_number)
return trans
def channel(self, ch_type, transport=None):
ch = self._new_channel(ch_type,
ch_number=self._channel_id_pool.get_id(),
transport=transport)
# @TODO keep track of all channels to close them later from the top
ch._transport.add_on_close_callback(self._on_channel_close)
return ch
def _on_channel_close(self, ch, code, text):
log.debug("LocalNode._on_channel_close (%s)", ch.channel_number)
self._channel_id_pool.release_id(ch.channel_number)
class LocalNode(BaseNode):
def __init__(self, router=None):
BaseNode.__init__(self)
self._own_router = True
if router is not None:
self._local_router = router
self._own_router = False
else:
self._local_router = LocalRouter(get_sys_name())
self._channel_id_pool = IDPool()
def start_node(self):
BaseNode.start_node(self)
if self._own_router:
self._local_router.start()
def stop_node(self):
if self.running:
if self._own_router:
self._local_router.stop()
self.running = False
def _new_transport(self, ch_number=None):
trans = LocalTransport(self._local_router, ch_number)
return trans
def channel(self, ch_type, transport=None):
ch = self._new_channel(ch_type, ch_number=self._channel_id_pool.get_id(), transport=transport)
# @TODO keep track of all channels to close them later from the top
ch._transport.add_on_close_callback(self._on_channel_close)
return ch
def _on_channel_close(self, ch, code, text):
log.debug("ZeroMQNode._on_channel_close (%s)", ch.channel_number)
self._channel_id_pool.release_id(ch.channel_number)
class NodeB(amqp.Node):
"""
Blocking interface to AMQP messaging primitives.
Wrap around Node and create blocking interface for getting channel
objects.
"""
def __init__(self):
log.debug("In NodeB.__init__")
self.running = False
self.ready = event.Event()
self._lock = coros.RLock()
self._pool = IDPool()
self._bidir_pool = {
} # maps inactive/active our numbers (from self._pool) to channels
self._pool_map = {
} # maps active pika channel numbers to our numbers (from self._pool)
self.interceptors = {} # endpoint interceptors
amqp.Node.__init__(self)
def start_node(self):
"""
This should only be called by on_connection_opened.
so, maybe we don't need a start_node/stop_node interface
"""
log.debug("In start_node")
amqp.Node.start_node(self)
self.running = True
self.ready.set()
def stop_node(self):
"""
Closes the connection to the broker, cleans up resources held by this node.
"""
log.debug("NodeB.stop_node (running: %s)", self.running)
if self.running:
# clean up pooling before we shut connection
self._destroy_pool()
self.client.close()
self.running = False
def _destroy_pool(self):
"""
Explicitly deletes pooled queues in this Node.
"""
for chan in self._bidir_pool.itervalues():
chan._destroy_queue()
def _new_channel(self, ch_type, ch_number=None, **kwargs):
"""
Creates a pyon Channel based on the passed in type, and activates it for use.
"""
chan = ch_type(**kwargs)
amq_chan = blocking_cb(self.client.channel,
'on_open_callback',
channel_number=ch_number)
if amq_chan is None:
log.error(
"AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s",
ch_number)
import traceback
traceback.print_stack()
raise StandardError(
"AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s"
% ch_number)
chan.on_channel_open(amq_chan)
return chan
def channel(self, ch_type, **kwargs):
"""
Creates a Channel object with an underlying transport callback and returns it.
@type ch_type BaseChannel
"""
log.debug("NodeB.channel")
with self._lock:
# having _queue_auto_delete on is a pre-req to being able to pool.
if ch_type == channel.BidirClientChannel and not ch_type._queue_auto_delete:
chid = self._pool.get_id()
if chid in self._bidir_pool:
log.debug(
"BidirClientChannel requested, pulling from pool (%d)",
chid)
assert not chid in self._pool_map.values()
ch = self._bidir_pool[chid]
self._pool_map[ch.get_channel_id()] = chid
else:
log.debug(
"BidirClientChannel requested, no pool items available, creating new (%d)",
chid)
ch = self._new_channel(ch_type, **kwargs)
ch.set_close_callback(self.on_channel_request_close)
self._bidir_pool[chid] = ch
self._pool_map[ch.get_channel_id()] = chid
else:
ch = self._new_channel(ch_type, **kwargs)
assert ch
return ch
def on_channel_request_close(self, ch):
"""
Close callback for pooled Channels.
When a new, pooled Channel is created that this Node manages, it will specify this as the
close callback in order to prevent that Channel from actually closing.
"""
log.debug("NodeB: on_channel_request_close\n\tChType %s, Ch#: %d",
ch.__class__, ch.get_channel_id())
assert ch.get_channel_id() in self._pool_map
with self._lock:
chid = self._pool_map.pop(ch.get_channel_id())
log.debug("Releasing BiDir pool Pika #%d, our id #%d",
ch.get_channel_id(), chid)
self._pool.release_id(chid)
# reset channel
ch.reset()
# sanity check: if auto delete got turned on, we must remove this channel from the pool
if ch._queue_auto_delete:
log.warn(
"A pooled channel now has _queue_auto_delete set true, we must remove it: check what caused this as it's likely a timing error"
)
self._bidir_pool.pop(chid)
self._pool._ids_free.remove(chid)
def setup_interceptors(self, interceptor_cfg):
stack = interceptor_cfg["stack"]
defs = interceptor_cfg["interceptors"]
interceptors = defaultdict(list)
by_name_dict = {}
for type_and_direction in stack:
interceptor_names = stack[type_and_direction]
for name in interceptor_names:
if name in by_name_dict:
classinst = by_name_dict[name]
else:
interceptor_def = defs[name]
# Instantiate and put in by_name array
modpath, classname = interceptor_def['class'].rsplit(
'.', 1)
classinst = for_name(modpath, classname)
# Call configure
classinst.configure(
config=interceptor_def["config"] if "config" in
interceptor_def else None)
# Put in by_name_dict for possible re-use
by_name_dict[name] = classinst
interceptors[type_and_direction].append(classinst)
self.interceptors = dict(interceptors)
class LocalRouter(object):
"""
A RabbitMQ-like routing device implemented with gevent mechanisms for an in-memory broker.
Using LocalTransport, can handle topic-exchange-like communication in ION within the context
of a single container.
"""
class ConsumerClosedMessage(object):
"""
Dummy object used to exit queue get looping greenlets.
"""
pass
def __init__(self, sysname):
self._sysname = sysname
self.ready = Event()
# exchange/queues/bindings
self._exchanges = {} # names -> { subscriber, topictrie(queue name) }
self._queues = {} # names -> gevent queue
self._bindings_by_queue = defaultdict(
list) # queue name -> [(ex, binding)]
self._lock_declarables = coros.RLock(
) # exchanges, queues, bindings, routing method
# consumers
self._consumers = defaultdict(
list) # queue name -> [ctag, channel._on_deliver]
self._consumers_by_ctag = {} # ctag -> queue_name ??
self._ctag_pool = IDPool() # pool of consumer tags
self._lock_consumers = coros.RLock(
) # lock for interacting with any consumer related attrs
# deliveries
self._unacked = {} # dtag -> (ctag, msg)
self._lock_unacked = coros.RLock(
) # lock for interacting with unacked field
self._gl_msgs = None
self._gl_pool = Pool()
self.gl_ioloop = None
self.errors = []
@property
def _connect_addr(self):
return "inproc://%s" % self._sysname
def start(self):
"""
Starts all internal greenlets of this router device.
"""
self._queue_incoming = Queue()
self._gl_msgs = self._gl_pool.spawn(self._run_gl_msgs)
self._gl_msgs.link_exception(self._child_failed)
self.gl_ioloop = spawn(self._run_ioloop)
def stop(self):
self._gl_msgs.kill() # @TODO: better
self._gl_pool.join(timeout=5, raise_error=True)
def _run_gl_msgs(self):
self.ready.set()
while True:
ex, rkey, body, props = self._queue_incoming.get()
try:
with self._lock_declarables:
self._route(ex, rkey, body, props)
except Exception as e:
self.errors.append(e)
log.exception("Routing message")
def _route(self, exchange, routing_key, body, props):
"""
Delivers incoming messages into queues based on known routes.
This entire method runs in a lock (likely pretty slow).
"""
assert exchange in self._exchanges, "Unknown exchange %s" % exchange
queues = self._exchanges[exchange].get_all_matches(routing_key)
log.debug("route: ex %s, rkey %s, matched %s routes", exchange,
routing_key, len(queues))
# deliver to each queue
for q in queues:
assert q in self._queues
log.debug("deliver -> %s", q)
self._queues[q].put((exchange, routing_key, body, props))
def _child_failed(self, gproc):
"""
Handler method for when any child worker thread dies with error.
Aborts the "ioloop" greenlet.
"""
log.error("Child (%s) failed with an exception: %s", gproc,
gproc.exception)
if self.gl_ioloop:
self.gl_ioloop.kill(exception=gproc.exception, block=False)
def _run_ioloop(self):
"""
An "IOLoop"-like greenlet - sits and waits until the pool is finished.
Fits with the AMQP node.
"""
self._gl_pool.join()
def publish(self,
exchange,
routing_key,
body,
properties,
immediate=False,
mandatory=False):
self._queue_incoming.put((exchange, routing_key, body, properties))
sleep(
0.0001
) # really wish switch would work instead of a sleep, seems wrong
def declare_exchange(self, exchange, **kwargs):
with self._lock_declarables:
if not exchange in self._exchanges:
self._exchanges[exchange] = TopicTrie()
def delete_exchange(self, exchange, **kwargs):
with self._lock_declarables:
if exchange in self._exchanges:
del self._exchanges[exchange]
def declare_queue(self, queue, **kwargs):
with self._lock_declarables:
# come up with new queue name if none specified
if queue is None or queue == '':
while True:
proposed = "q-%s" % str(uuid4())[0:10]
if proposed not in self._queues:
queue = proposed
break
if not queue in self._queues:
self._queues[queue] = Queue()
return queue
def delete_queue(self, queue, **kwargs):
with self._lock_declarables:
if queue in self._queues:
del self._queues[queue]
# kill bindings
for ex, binding in self._bindings_by_queue[queue]:
if ex in self._exchanges:
self._exchanges[ex].remove_topic_tree(binding, queue)
self._bindings_by_queue.pop(queue)
def bind(self, exchange, queue, binding):
log.info("Bind: ex %s, q %s, b %s", exchange, queue, binding)
with self._lock_declarables:
assert exchange in self._exchanges, "Missing exchange %s in list of exchanges" % str(
exchange)
assert queue in self._queues
tt = self._exchanges[exchange]
tt.add_topic_tree(binding, queue)
self._bindings_by_queue[queue].append((exchange, binding))
def unbind(self, exchange, queue, binding):
with self._lock_declarables:
assert exchange in self._exchanges
assert queue in self._queues
self._exchanges[exchange].remove_topic_tree(binding, queue)
for i, val in enumerate(self._bindings_by_queue[queue]):
ex, b = val
if ex == exchange and b == binding:
self._bindings_by_queue[queue].pop(i)
break
def start_consume(self, callback, queue, no_ack=False, exclusive=False):
assert queue in self._queues
with self._lock_consumers:
new_ctag = self._generate_ctag()
assert new_ctag not in self._consumers_by_ctag
with self._lock_declarables:
gl = self._gl_pool.spawn(self._run_consumer, new_ctag, queue,
self._queues[queue], callback)
gl.link_exception(self._child_failed)
self._consumers[queue].append(
(new_ctag, callback, no_ack, exclusive, gl))
self._consumers_by_ctag[new_ctag] = queue
return new_ctag
def stop_consume(self, consumer_tag):
assert consumer_tag in self._consumers_by_ctag
with self._lock_consumers:
queue = self._consumers_by_ctag[consumer_tag]
self._consumers_by_ctag.pop(consumer_tag)
for i, consumer in enumerate(self._consumers[queue]):
if consumer[0] == consumer_tag:
# notify consumer greenlet that we want to stop
if queue in self._queues:
self._queues[queue].put(self.ConsumerClosedMessage())
consumer[4].join(timeout=5)
consumer[4].kill()
# @TODO reject any unacked messages
self._consumers[queue].pop(i)
break
self._return_ctag(consumer_tag)
def _run_consumer(self, ctag, queue_name, gqueue, callback):
cnt = 0
while True:
m = gqueue.get()
if isinstance(m, self.ConsumerClosedMessage):
break
exchange, routing_key, body, props = m
# create method frame
method_frame = DotDict()
method_frame['consumer_tag'] = ctag
method_frame['redelivered'] = False # @TODO
method_frame['exchange'] = exchange
method_frame['routing_key'] = routing_key
# create header frame
header_frame = DotDict()
header_frame['headers'] = props.copy()
# make delivery tag for ack/reject later
dtag = self._generate_dtag(ctag, cnt)
cnt += 1
with self._lock_unacked:
self._unacked[dtag] = (ctag, queue_name, m)
method_frame['delivery_tag'] = dtag
# deliver to callback
try:
callback(self, method_frame, header_frame, body)
except Exception:
log.exception("delivering to consumer, ignore!")
def _generate_ctag(self):
return "zctag-%s" % self._ctag_pool.get_id()
def _return_ctag(self, ctag):
self._ctag_pool.release_id(int(ctag.split("-")[-1]))
def _generate_dtag(self, ctag, cnt):
"""
Generates a unique delivery tag for each consumer.
Greenlet-safe, no need to lock.
"""
return "%s-%s" % (ctag, cnt)
def ack(self, delivery_tag):
assert delivery_tag in self._unacked
with self._lock_unacked:
del self._unacked[delivery_tag]
def reject(self, delivery_tag, requeue=False):
assert delivery_tag in self._unacked
with self._lock_unacked:
_, queue, m = self._unacked.pop(delivery_tag)
if requeue:
log.warn("REQUEUE: EXPERIMENTAL %s", delivery_tag)
self._queues[queue].put(m)
def transport_close(self, transport):
log.warn("LocalRouter.transport_close: %s TODO", transport)
# @TODO reject all messages in unacked spot
# turn off any consumers from this transport
def get_stats(self, queue):
"""
Returns a 2-tuple of (# msgs, # consumers) on a given queue.
"""
assert queue in self._queues
consumers = 0
if queue in self._consumers:
consumers = len(self._consumers[queue])
# the queue qsize gives you number of undelivered messages, which i think is what AMQP does too
return (self._queues[queue].qsize(), consumers)
def purge(self, queue):
"""
Deletes all contents of a queue.
@TODO could end up in a race with an infinite producer
"""
assert queue in self._queues
with Timeout(5):
while not self._queues[queue].empty():
self._queues[queue].get_nowait()
class LocalRouter(object):
"""
A RabbitMQ-like routing device implemented with gevent mechanisms for an in-memory broker.
Using LocalTransport, can handle topic-exchange-like communication in ION within the context
of a single container.
"""
class ConsumerClosedMessage(object):
"""
Dummy object used to exit queue get looping greenlets.
"""
pass
def __init__(self, sysname):
self._sysname = sysname
self.ready = Event()
# exchange/queues/bindings
self._exchanges = {} # names -> { subscriber, topictrie(queue name) }
self._queues = {} # names -> gevent queue
self._bindings_by_queue = defaultdict(list) # queue name -> [(ex, binding)]
self._lock_declarables = RLock() # exchanges, queues, bindings, routing method
# consumers
self._consumers = defaultdict(list) # queue name -> [ctag, channel._on_deliver]
self._consumers_by_ctag = {} # ctag -> queue_name ??
self._ctag_pool = IDPool() # pool of consumer tags
self._lock_consumers = RLock() # lock for interacting with any consumer related attrs
# deliveries
self._unacked = {} # dtag -> (ctag, msg)
self._lock_unacked = RLock() # lock for interacting with unacked field
self._gl_msgs = None
self._gl_pool = Pool()
self.gl_ioloop = None
self.errors = []
@property
def _connect_addr(self):
return "inproc://%s" % self._sysname
def start(self):
"""
Starts all internal greenlets of this router device.
"""
self._queue_incoming = Queue()
self._gl_msgs = self._gl_pool.spawn(self._run_gl_msgs)
self._gl_msgs._glname = "pyon.net AMQP msgs"
self._gl_msgs.link_exception(self._child_failed)
self.gl_ioloop = spawn(self._run_ioloop)
self.gl_ioloop._glname = "pyon.net AMQP ioloop"
def stop(self):
self._gl_msgs.kill() # @TODO: better
self._gl_pool.join(timeout=5, raise_error=True)
def _run_gl_msgs(self):
self.ready.set()
while True:
ex, rkey, body, props = self._queue_incoming.get()
try:
with self._lock_declarables:
self._route(ex, rkey, body, props)
except Exception as e:
self.errors.append(e)
log.exception("Routing message")
def _route(self, exchange, routing_key, body, props):
"""
Delivers incoming messages into queues based on known routes.
This entire method runs in a lock (likely pretty slow).
"""
assert exchange in self._exchanges, "Unknown exchange %s" % exchange
queues = self._exchanges[exchange].get_all_matches(routing_key)
log.debug("route: ex %s, rkey %s, matched %s routes", exchange, routing_key, len(queues))
# deliver to each queue
for q in queues:
assert q in self._queues
log.debug("deliver -> %s", q)
self._queues[q].put((exchange, routing_key, body, props))
def _child_failed(self, gproc):
"""
Handler method for when any child worker thread dies with error.
Aborts the "ioloop" greenlet.
"""
log.error("Child (%s) failed with an exception: %s", gproc, gproc.exception)
if self.gl_ioloop:
self.gl_ioloop.kill(exception=gproc.exception, block=False)
def _run_ioloop(self):
"""
An "IOLoop"-like greenlet - sits and waits until the pool is finished.
Fits with the AMQP node.
"""
self._gl_pool.join()
def publish(self, exchange, routing_key, body, properties, immediate=False, mandatory=False):
self._queue_incoming.put((exchange, routing_key, body, properties))
sleep(0.0001) # really wish switch would work instead of a sleep, seems wrong
def declare_exchange(self, exchange, **kwargs):
with self._lock_declarables:
if not exchange in self._exchanges:
self._exchanges[exchange] = TopicTrie()
def delete_exchange(self, exchange, **kwargs):
with self._lock_declarables:
if exchange in self._exchanges:
del self._exchanges[exchange]
def declare_queue(self, queue, **kwargs):
with self._lock_declarables:
# come up with new queue name if none specified
if queue is None or queue == '':
while True:
proposed = "q-%s" % str(uuid4())[0:10]
if proposed not in self._queues:
queue = proposed
break
if not queue in self._queues:
self._queues[queue] = Queue()
return queue
def delete_queue(self, queue, **kwargs):
with self._lock_declarables:
if queue in self._queues:
del self._queues[queue]
# kill bindings
for ex, binding in self._bindings_by_queue[queue]:
if ex in self._exchanges:
self._exchanges[ex].remove_topic_tree(binding, queue)
self._bindings_by_queue.pop(queue)
def bind(self, exchange, queue, binding):
log.info("Bind: ex %s, q %s, b %s", exchange, queue, binding)
with self._lock_declarables:
assert exchange in self._exchanges, "Missing exchange %s in list of exchanges" % str(exchange)
assert queue in self._queues
tt = self._exchanges[exchange]
tt.add_topic_tree(binding, queue)
self._bindings_by_queue[queue].append((exchange, binding))
def unbind(self, exchange, queue, binding):
with self._lock_declarables:
assert exchange in self._exchanges
assert queue in self._queues
self._exchanges[exchange].remove_topic_tree(binding, queue)
for i, val in enumerate(self._bindings_by_queue[queue]):
ex, b = val
if ex == exchange and b == binding:
self._bindings_by_queue[queue].pop(i)
break
def start_consume(self, callback, queue, no_ack=False, exclusive=False):
assert queue in self._queues
with self._lock_consumers:
new_ctag = self._generate_ctag()
assert new_ctag not in self._consumers_by_ctag
with self._lock_declarables:
gl = self._gl_pool.spawn(self._run_consumer, new_ctag, queue, self._queues[queue], callback)
gl.link_exception(self._child_failed)
self._consumers[queue].append((new_ctag, callback, no_ack, exclusive, gl))
self._consumers_by_ctag[new_ctag] = queue
return new_ctag
def stop_consume(self, consumer_tag):
assert consumer_tag in self._consumers_by_ctag
with self._lock_consumers:
queue = self._consumers_by_ctag[consumer_tag]
self._consumers_by_ctag.pop(consumer_tag)
for i, consumer in enumerate(self._consumers[queue]):
if consumer[0] == consumer_tag:
# notify consumer greenlet that we want to stop
if queue in self._queues:
self._queues[queue].put(self.ConsumerClosedMessage())
consumer[4].join(timeout=5)
consumer[4].kill()
# @TODO reject any unacked messages
self._consumers[queue].pop(i)
break
self._return_ctag(consumer_tag)
def _run_consumer(self, ctag, queue_name, gqueue, callback):
cnt = 0
while True:
m = gqueue.get()
if isinstance(m, self.ConsumerClosedMessage):
break
exchange, routing_key, body, props = m
# create method frame
method_frame = DotDict()
method_frame['consumer_tag'] = ctag
method_frame['redelivered'] = False # @TODO
method_frame['exchange'] = exchange
method_frame['routing_key'] = routing_key
# create header frame
header_frame = DotDict()
header_frame['headers'] = props.copy()
# make delivery tag for ack/reject later
dtag = self._generate_dtag(ctag, cnt)
cnt += 1
with self._lock_unacked:
self._unacked[dtag] = (ctag, queue_name, m)
method_frame['delivery_tag'] = dtag
# deliver to callback
try:
callback(self, method_frame, header_frame, body)
except Exception:
log.exception("delivering to consumer, ignore!")
def _generate_ctag(self):
return "zctag-%s" % self._ctag_pool.get_id()
def _return_ctag(self, ctag):
self._ctag_pool.release_id(int(ctag.split("-")[-1]))
def _generate_dtag(self, ctag, cnt):
"""
Generates a unique delivery tag for each consumer.
Greenlet-safe, no need to lock.
"""
return "%s-%s" % (ctag, cnt)
def ack(self, delivery_tag):
assert delivery_tag in self._unacked
with self._lock_unacked:
del self._unacked[delivery_tag]
def reject(self, delivery_tag, requeue=False):
assert delivery_tag in self._unacked
with self._lock_unacked:
_, queue, m = self._unacked.pop(delivery_tag)
if requeue:
log.warn("REQUEUE: EXPERIMENTAL %s", delivery_tag)
self._queues[queue].put(m)
def transport_close(self, transport):
log.warn("LocalRouter.transport_close: %s TODO", transport)
# @TODO reject all messages in unacked spot
# turn off any consumers from this transport
def get_stats(self, queue):
"""
Returns a 2-tuple of (# msgs, # consumers) on a given queue.
"""
assert queue in self._queues
consumers = 0
if queue in self._consumers:
consumers = len(self._consumers[queue])
# the queue qsize gives you number of undelivered messages, which i think is what AMQP does too
return (self._queues[queue].qsize(), consumers)
def purge(self, queue):
"""
Deletes all contents of a queue.
@TODO could end up in a race with an infinite producer
"""
assert queue in self._queues
with Timeout(5):
while not self._queues[queue].empty():
self._queues[queue].get_nowait()
class NodeB(BaseNode):
"""
Blocking interface to AMQP messaging primitives.
Wrap around Node and create blocking interface for getting channel
objects.
"""
def __init__(self):
log.debug("In NodeB.__init__")
BaseNode.__init__(self)
self._pool = IDPool()
self._bidir_pool = {} # maps inactive/active our numbers (from self._pool) to channels
self._pool_map = {} # maps active pika channel numbers to our numbers (from self._pool)
self._dead_pool = [] # channels removed from pool for failing health test, for later forensics
BaseNode.__init__(self)
def stop_node(self):
"""
Closes the connection to the broker, cleans up resources held by this node.
"""
log.debug("NodeB.stop_node (running: %s)", self.running)
if self.running:
# clean up pooling before we shut connection
self._destroy_pool()
self.client.close()
BaseNode.stop_node(self)
def _destroy_pool(self):
"""
Explicitly deletes pooled queues in this Node.
"""
for chan in self._bidir_pool.itervalues():
if chan._recv_name:
chan._destroy_queue()
def _new_transport(self, ch_number=None):
"""
Creates a new AMQPTransport with an underlying Pika channel.
"""
amq_chan = blocking_cb(self.client.channel, 'on_open_callback', channel_number=ch_number)
if amq_chan is None:
log.error("AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s", ch_number)
from pyon.container.cc import Container
if Container.instance is not None:
Container.instance.fail_fast("AMQCHAN IS NONE, messaging has failed", True)
raise StandardError("AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s" % ch_number)
transport = AMQPTransport(amq_chan)
# return the pending in collection (lets this number be assigned again later)
self.client._pending.remove(transport.channel_number)
# by default, everything should have a prefetch count of 1 (configurable)
# this can be overridden by the channel get_n related methods
transport.qos_impl(prefetch_count=CFG.get_safe('container.messaging.endpoint.prefetch_count', 1))
return transport
def _check_pooled_channel_health(self, ch):
"""
Returns true if the channel has the proper callbacks in pika for delivery.
We're seeing an issue where channels are considered open and consuming by pika, RabbitMQ,
and our layer, but the "callbacks" mechanism in pika does not have any entries for
delivering messages to our layer, therefore messages are being dropped. Rabbit is happily
sending messages along, resulting in large numbers of UNACKED messages.
If this method returns false, the channel should be discarded and a new one created.
"""
cbs = self.client.callbacks._callbacks
if "_on_basic_deliver" not in cbs[ch.get_channel_id()].iterkeys():
return False
return True
def channel(self, ch_type, transport=None):
"""
Creates a Channel object with an underlying transport callback and returns it.
@type ch_type BaseChannel
"""
#log.debug("NodeB.channel")
with self._lock:
# having _queue_auto_delete on is a pre-req to being able to pool.
if ch_type == channel.BidirClientChannel and not ch_type._queue_auto_delete:
# only attempt this 5 times - somewhat arbitrary but we can't have an infinite loop here
attempts = 5
while attempts > 0:
attempts -= 1
chid = self._pool.get_id()
if chid in self._bidir_pool:
log.debug("BidirClientChannel requested, pulling from pool (%d)", chid)
assert not chid in self._pool_map.values()
# we need to check the health of this bidir channel
ch = self._bidir_pool[chid]
if not self._check_pooled_channel_health(ch):
log.warning("Channel (%d) failed health check, removing from pool", ch.get_channel_id())
# return chid to the id pool
self._pool.release_id(chid)
# remove this channel from the pool, put into dead pool
self._dead_pool.append(ch)
del self._bidir_pool[chid]
# now close the channel (must remove our close callback which returns it to the pool)
assert ch._close_callback == self.on_channel_request_close
ch._close_callback = None
ch.close()
# resume the loop to attempt to get one again
continue
self._pool_map[ch.get_channel_id()] = chid
else:
log.debug("BidirClientChannel requested, no pool items available, creating new (%d)", chid)
ch = self._new_channel(ch_type, transport=transport)
ch.set_close_callback(self.on_channel_request_close)
self._bidir_pool[chid] = ch
self._pool_map[ch.get_channel_id()] = chid
# channel here is valid, exit out of attempts loop
break
else: # while loop didn't get a valid channel in X attempts
raise StandardError("Could not get a valid channel")
else:
ch = self._new_channel(ch_type, transport=transport)
assert ch
return ch
def on_channel_request_close(self, ch):
"""
Close callback for pooled Channels.
When a new, pooled Channel is created that this Node manages, it will specify this as the
close callback in order to prevent that Channel from actually closing.
"""
log.debug("NodeB: on_channel_request_close\n\tChType %s, Ch#: %d", ch.__class__, ch.get_channel_id())
assert ch.get_channel_id() in self._pool_map
with self._lock:
chid = self._pool_map.pop(ch.get_channel_id())
log.debug("Releasing BiDir pool Pika #%d, our id #%d", ch.get_channel_id(), chid)
self._pool.release_id(chid)
# reset channel
ch.reset()
# sanity check: if auto delete got turned on, we must remove this channel from the pool
if ch._queue_auto_delete:
log.warn("A pooled channel now has _queue_auto_delete set true, we must remove it: check what caused this as it's likely a timing error")
self._bidir_pool.pop(chid)
self._pool._ids_free.remove(chid)
class NodeB(amqp.Node):
"""
Blocking interface to AMQP messaging primitives.
Wrap around Node and create blocking interface for getting channel
objects.
"""
def __init__(self):
log.debug("In NodeB.__init__")
self.ready = event.Event()
self._lock = coros.RLock()
self._pool = IDPool()
self._bidir_pool = {} # maps inactive/active our numbers (from self._pool) to channels
self._pool_map = {} # maps active pika channel numbers to our numbers (from self._pool)
amqp.Node.__init__(self)
def start_node(self):
"""
This should only be called by on_connection_opened.
so, maybe we don't need a start_node/stop_node interface
"""
log.debug("In start_node")
amqp.Node.start_node(self)
self.running = 1
self.ready.set()
def _new_channel(self, ch_type, ch_number=None, **kwargs):
"""
Creates a pyon Channel based on the passed in type, and activates it for use.
"""
chan = ch_type(**kwargs)
amq_chan = blocking_cb(self.client.channel, 'on_open_callback', channel_number=ch_number)
chan.on_channel_open(amq_chan)
return chan
def channel(self, ch_type, **kwargs):
"""
Creates a Channel object with an underlying transport callback and returns it.
@type ch_type BaseChannel
"""
log.debug("NodeB.channel")
with self._lock:
# having _queue_auto_delete on is a pre-req to being able to pool.
if ch_type == channel.BidirClientChannel and not ch_type._queue_auto_delete:
chid = self._pool.get_id()
if chid in self._bidir_pool:
log.debug("BidirClientChannel requested, pulling from pool (%d)", chid)
assert not chid in self._pool_map.values()
ch = self._bidir_pool[chid]
self._pool_map[ch.get_channel_id()] = chid
else:
log.debug("BidirClientChannel requested, no pool items available, creating new (%d)", chid)
ch = self._new_channel(ch_type, **kwargs)
ch.set_close_callback(self.on_channel_request_close)
self._bidir_pool[chid] = ch
self._pool_map[ch.get_channel_id()] = chid
else:
ch = self._new_channel(ch_type, **kwargs)
assert ch
return ch
def on_channel_request_close(self, ch):
"""
Close callback for pooled Channels.
When a new, pooled Channel is created that this Node manages, it will specify this as the
close callback in order to prevent that Channel from actually closing.
"""
log.debug("NodeB: on_channel_request_close\n\tChType %s, Ch#: %d", ch.__class__, ch.get_channel_id())
assert ch.get_channel_id() in self._pool_map
with self._lock:
ch.stop_consume()
chid = self._pool_map.pop(ch.get_channel_id())
log.debug("Releasing BiDir pool Pika #%d, our id #%d", ch.get_channel_id(), chid)
self._pool.release_id(chid)
# sanity check: if auto delete got turned on, we must remove this channel from the pool
if ch._queue_auto_delete:
log.warn("A pooled channel now has _queue_auto_delete set true, we must remove it: check what caused this as it's likely a timing error")
self._bidir_pool.pop(chid)
self._pool._ids_free.remove(chid)
class PoolTest(PyonTestCase):
def setUp(self):
self._idpool = IDPool()
def test_get_id(self):
self.assertEquals(self._idpool.get_id(), 1)
self.assertEquals(self._idpool.get_id(), 2)
self.assertEquals(self._idpool.get_id(), 3)
self.assertEquals(self._idpool.get_id(), 4)
self.assertEquals(self._idpool._ids_in_use, { 1, 2, 3, 4 } )
def test_release_id(self):
self._idpool.get_id()
self._idpool.release_id(1)
self.assertEquals(self._idpool._ids_in_use, set())
self.assertEquals(self._idpool._ids_free, { 1 })
def test_get_and_release_id(self):
self._idpool.get_id()
self._idpool.get_id()
self._idpool.get_id()
self._idpool.get_id()
self._idpool.release_id(3)
self.assertEquals(self._idpool._ids_in_use, { 1, 2, 4 })
self.assertEquals(self._idpool._ids_free, { 3 } )
self.assertEquals(self._idpool.get_id(), 3)
self._idpool.release_id(2)
self._idpool.release_id(1)
self.assertIn(self._idpool.get_id(), { 1, 2 })
self.assertIn(self._idpool.get_id(), { 1, 2 })
self.assertNotIn(self._idpool.get_id(), { 1, 2 }) # is 5 now
def test_release_unknown_id(self):
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, set())
self._idpool.release_id(1)
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, set())
self._idpool.get_id()
self._idpool.get_id()
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, { 1, 2 })
self._idpool.release_id(3) # still doesn't exist
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, {1, 2} )
def test_different_new_id_method(self):
new_id = lambda x: x + 2
self._idpool = IDPool(new_id=new_id)
self.assertEquals(self._idpool.get_id(), 2)
self.assertEquals(self._idpool.get_id(), 4)
self.assertEquals(self._idpool.get_id(), 6)
self._idpool.release_id(4)
self.assertEquals(self._idpool.get_id(), 4)
self.assertEquals(self._idpool._last_id, 6)
class NodeB(BaseNode):
"""
Blocking interface to AMQP messaging primitives.
Wrap around Node and create blocking interface for getting channel
objects.
"""
def __init__(self):
log.debug("In NodeB.__init__")
BaseNode.__init__(self)
self._pool = IDPool()
self._bidir_pool = {
} # maps inactive/active our numbers (from self._pool) to channels
self._pool_map = {
} # maps active pika channel numbers to our numbers (from self._pool)
self._dead_pool = [
] # channels removed from pool for failing health test, for later forensics
BaseNode.__init__(self)
def stop_node(self):
"""
Closes the connection to the broker, cleans up resources held by this node.
"""
log.info("Closing broker connection with %s pooled channels",
len(self._bidir_pool))
if self.running:
# clean up pooling before we shut connection
self._destroy_pool()
self.client.close()
BaseNode.stop_node(self)
def _destroy_pool(self):
"""
Explicitly deletes pooled queues in this Node.
"""
for chan in self._bidir_pool.itervalues():
if chan._recv_name:
chan._destroy_queue()
def _new_transport(self, ch_number=None):
"""
Creates a new AMQPTransport with an underlying Pika channel.
"""
amq_chan = blocking_cb(self.client.channel,
'on_open_callback',
channel_number=ch_number)
if amq_chan is None:
log.error(
"AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s",
ch_number)
from pyon.container.cc import Container
if Container.instance is not None:
Container.instance.fail_fast(
"AMQCHAN IS NONE, messaging has failed", True)
raise StandardError(
"AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s"
% ch_number)
transport = AMQPTransport(amq_chan)
# return the pending in collection (lets this number be assigned again later)
self.client._pending.remove(transport.channel_number)
# by default, everything should have a prefetch count of 1 (configurable)
# this can be overridden by the channel get_n related methods
transport.qos_impl(prefetch_count=CFG.get_safe(
'container.messaging.endpoint.prefetch_count', 1))
return transport
def _check_pooled_channel_health(self, ch):
"""
Returns true if the channel has the proper callbacks in pika for delivery.
We're seeing an issue where channels are considered open and consuming by pika, RabbitMQ,
and our layer, but the "callbacks" mechanism in pika does not have any entries for
delivering messages to our layer, therefore messages are being dropped. Rabbit is happily
sending messages along, resulting in large numbers of UNACKED messages.
If this method returns false, the channel should be discarded and a new one created.
"""
cbs = self.client.callbacks._callbacks
if "_on_basic_deliver" not in cbs[ch.get_channel_id()].iterkeys():
return False
return True
def channel(self, ch_type, transport=None):
"""
Creates a Channel object with an underlying transport callback and returns it.
This function uses a channel pool, such that in certain conditions, channels can be
reused. Currently BidirClientChannel that is not auto-delete.
@type ch_type BaseChannel
"""
#log.debug("NodeB.channel")
with self._lock:
# having _queue_auto_delete on is a pre-req to being able to pool.
if ch_type == channel.BidirClientChannel and not ch_type._queue_auto_delete:
# only attempt this 5 times - somewhat arbitrary but we can't have an infinite loop here
attempts = 5
while attempts > 0:
attempts -= 1
chid = self._pool.get_id()
if chid in self._bidir_pool:
log.debug(
"BidirClientChannel requested, pulling from pool (%d)",
chid)
assert not chid in self._pool_map.values()
# we need to check the health of this bidir channel
ch = self._bidir_pool[chid]
if not self._check_pooled_channel_health(ch):
log.warning(
"Channel (%d) failed health check, removing from pool",
ch.get_channel_id())
# return chid to the id pool
self._pool.release_id(chid)
# remove this channel from the pool, put into dead pool
self._dead_pool.append(ch)
del self._bidir_pool[chid]
# now close the channel (must remove our close callback which returns it to the pool)
assert ch._close_callback == self.on_channel_request_close
ch._close_callback = None
ch.close()
# resume the loop to attempt to get one again
continue
self._pool_map[ch.get_channel_id()] = chid
else:
log.debug(
"BidirClientChannel requested, no pool items available, creating new (%d)",
chid)
ch = self._new_channel(ch_type, transport=transport)
ch.set_close_callback(self.on_channel_request_close)
self._bidir_pool[chid] = ch
self._pool_map[ch.get_channel_id()] = chid
# channel here is valid, exit out of attempts loop
break
else: # while loop didn't get a valid channel in X attempts
raise StandardError("Could not get a valid channel")
else:
# Create a different type channel
ch = self._new_channel(ch_type, transport=transport)
assert ch
return ch
def on_channel_request_close(self, ch):
"""
Close callback for pooled Channels.
When a new, pooled Channel is created that this Node manages, it will specify this as the
close callback in order to prevent that Channel from actually closing.
"""
log.debug("NodeB: on_channel_request_close\n\tChType %s, Ch#: %d",
ch.__class__, ch.get_channel_id())
assert ch.get_channel_id() in self._pool_map
with self._lock:
chid = self._pool_map.pop(ch.get_channel_id())
log.debug("Releasing BiDir pool Pika #%d, our id #%d",
ch.get_channel_id(), chid)
self._pool.release_id(chid)
# reset channel
ch.reset()
# sanity check: if auto delete got turned on, we must remove this channel from the pool
if ch._queue_auto_delete:
log.warn(
"A pooled channel now has _queue_auto_delete set true, we must remove it: check what caused this as it's likely a timing error"
)
self._bidir_pool.pop(chid)
self._pool._ids_free.remove(chid)
class PoolTest(PyonTestCase):
def setUp(self):
self._idpool = IDPool()
def test_get_id(self):
self.assertEquals(self._idpool.get_id(), 1)
self.assertEquals(self._idpool.get_id(), 2)
self.assertEquals(self._idpool.get_id(), 3)
self.assertEquals(self._idpool.get_id(), 4)
self.assertEquals(self._idpool._ids_in_use, {1, 2, 3, 4})
def test_release_id(self):
self._idpool.get_id()
self._idpool.release_id(1)
self.assertEquals(self._idpool._ids_in_use, set())
self.assertEquals(self._idpool._ids_free, {1})
def test_get_and_release_id(self):
self._idpool.get_id()
self._idpool.get_id()
self._idpool.get_id()
self._idpool.get_id()
self._idpool.release_id(3)
self.assertEquals(self._idpool._ids_in_use, {1, 2, 4})
self.assertEquals(self._idpool._ids_free, {3})
self.assertEquals(self._idpool.get_id(), 3)
self._idpool.release_id(2)
self._idpool.release_id(1)
self.assertIn(self._idpool.get_id(), {1, 2})
self.assertIn(self._idpool.get_id(), {1, 2})
self.assertNotIn(self._idpool.get_id(), {1, 2}) # is 5 now
def test_release_unknown_id(self):
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, set())
self._idpool.release_id(1)
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, set())
self._idpool.get_id()
self._idpool.get_id()
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, {1, 2})
self._idpool.release_id(3) # still doesn't exist
self.assertEquals(self._idpool._ids_free, set())
self.assertEquals(self._idpool._ids_in_use, {1, 2})
def test_different_new_id_method(self):
new_id = lambda x: x + 2
self._idpool = IDPool(new_id=new_id)
self.assertEquals(self._idpool.get_id(), 2)
self.assertEquals(self._idpool.get_id(), 4)
self.assertEquals(self._idpool.get_id(), 6)
self._idpool.release_id(4)
self.assertEquals(self._idpool.get_id(), 4)
self.assertEquals(self._idpool._last_id, 6)
class NodeB(amqp.Node):
"""
Blocking interface to AMQP messaging primitives.
Wrap around Node and create blocking interface for getting channel
objects.
"""
def __init__(self):
log.debug("In NodeB.__init__")
self.ready = event.Event()
self._lock = coros.RLock()
self._pool = IDPool()
self._bidir_pool = {
} # maps inactive/active our numbers (from self._pool) to channels
self._pool_map = {
} # maps active pika channel numbers to our numbers (from self._pool)
amqp.Node.__init__(self)
def start_node(self):
"""
This should only be called by on_connection_opened.
so, maybe we don't need a start_node/stop_node interface
"""
log.debug("In start_node")
amqp.Node.start_node(self)
self.running = 1
self.ready.set()
def _new_channel(self, ch_type, ch_number=None, **kwargs):
"""
Creates a pyon Channel based on the passed in type, and activates it for use.
"""
chan = ch_type(**kwargs)
amq_chan = blocking_cb(self.client.channel,
'on_open_callback',
channel_number=ch_number)
chan.on_channel_open(amq_chan)
return chan
def channel(self, ch_type, **kwargs):
"""
Creates a Channel object with an underlying transport callback and returns it.
@type ch_type BaseChannel
"""
log.debug("NodeB.channel")
with self._lock:
# having _queue_auto_delete on is a pre-req to being able to pool.
if ch_type == channel.BidirClientChannel and not ch_type._queue_auto_delete:
chid = self._pool.get_id()
if chid in self._bidir_pool:
log.debug(
"BidirClientChannel requested, pulling from pool (%d)",
chid)
assert not chid in self._pool_map.values()
ch = self._bidir_pool[chid]
self._pool_map[ch.get_channel_id()] = chid
else:
log.debug(
"BidirClientChannel requested, no pool items available, creating new (%d)",
chid)
ch = self._new_channel(ch_type, **kwargs)
ch.set_close_callback(self.on_channel_request_close)
self._bidir_pool[chid] = ch
self._pool_map[ch.get_channel_id()] = chid
else:
ch = self._new_channel(ch_type, **kwargs)
assert ch
return ch
def on_channel_request_close(self, ch):
"""
Close callback for pooled Channels.
When a new, pooled Channel is created that this Node manages, it will specify this as the
close callback in order to prevent that Channel from actually closing.
"""
log.debug("NodeB: on_channel_request_close\n\tChType %s, Ch#: %d",
ch.__class__, ch.get_channel_id())
assert ch.get_channel_id() in self._pool_map
with self._lock:
chid = self._pool_map.pop(ch.get_channel_id())
log.debug("Releasing BiDir pool Pika #%d, our id #%d",
ch.get_channel_id(), chid)
self._pool.release_id(chid)
# reset channel
ch.reset()
# sanity check: if auto delete got turned on, we must remove this channel from the pool
if ch._queue_auto_delete:
log.warn(
"A pooled channel now has _queue_auto_delete set true, we must remove it: check what caused this as it's likely a timing error"
)
self._bidir_pool.pop(chid)
self._pool._ids_free.remove(chid)
class NodeB(BaseNode):
"""
Blocking interface to AMQP messaging primitives.
Wrap around Node and create blocking interface for getting channel
objects.
"""
def __init__(self):
log.debug("In NodeB.__init__")
BaseNode.__init__(self)
self._pool = IDPool()
self._bidir_pool = {} # maps inactive/active our numbers (from self._pool) to channels
self._pool_map = {} # maps active pika channel numbers to our numbers (from self._pool)
BaseNode.__init__(self)
def stop_node(self):
"""
Closes the connection to the broker, cleans up resources held by this node.
"""
log.debug("NodeB.stop_node (running: %s)", self.running)
if self.running:
# clean up pooling before we shut connection
self._destroy_pool()
self.client.close()
BaseNode.stop_node(self)
def _destroy_pool(self):
"""
Explicitly deletes pooled queues in this Node.
"""
for chan in self._bidir_pool.itervalues():
if chan._recv_name:
chan._destroy_queue()
def _new_transport(self, ch_number=None):
"""
Creates a new AMQPTransport with an underlying Pika channel.
"""
amq_chan = blocking_cb(self.client.channel, 'on_open_callback', channel_number=ch_number)
if amq_chan is None:
log.error("AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s", ch_number)
traceback.print_stack()
from pyon.container.cc import Container
if Container.instance is not None:
Container.instance.fail_fast("AMQCHAN IS NONE, messaging has failed", True)
raise StandardError("AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s" % ch_number)
transport = AMQPTransport(amq_chan)
return transport
def channel(self, ch_type, transport=None):
"""
Creates a Channel object with an underlying transport callback and returns it.
@type ch_type BaseChannel
"""
log.debug("NodeB.channel")
with self._lock:
# having _queue_auto_delete on is a pre-req to being able to pool.
if ch_type == channel.BidirClientChannel and not ch_type._queue_auto_delete:
chid = self._pool.get_id()
if chid in self._bidir_pool:
log.debug("BidirClientChannel requested, pulling from pool (%d)", chid)
assert not chid in self._pool_map.values()
ch = self._bidir_pool[chid]
self._pool_map[ch.get_channel_id()] = chid
else:
log.debug("BidirClientChannel requested, no pool items available, creating new (%d)", chid)
ch = self._new_channel(ch_type, transport=transport)
ch.set_close_callback(self.on_channel_request_close)
self._bidir_pool[chid] = ch
self._pool_map[ch.get_channel_id()] = chid
else:
ch = self._new_channel(ch_type, transport=transport)
assert ch
return ch
def on_channel_request_close(self, ch):
"""
Close callback for pooled Channels.
When a new, pooled Channel is created that this Node manages, it will specify this as the
close callback in order to prevent that Channel from actually closing.
"""
log.debug("NodeB: on_channel_request_close\n\tChType %s, Ch#: %d", ch.__class__, ch.get_channel_id())
assert ch.get_channel_id() in self._pool_map
with self._lock:
chid = self._pool_map.pop(ch.get_channel_id())
log.debug("Releasing BiDir pool Pika #%d, our id #%d", ch.get_channel_id(), chid)
self._pool.release_id(chid)
# reset channel
ch.reset()
# sanity check: if auto delete got turned on, we must remove this channel from the pool
if ch._queue_auto_delete:
log.warn("A pooled channel now has _queue_auto_delete set true, we must remove it: check what caused this as it's likely a timing error")
self._bidir_pool.pop(chid)
self._pool._ids_free.remove(chid)
class NodeB(amqp.Node):
"""
Blocking interface to AMQP messaging primitives.
Wrap around Node and create blocking interface for getting channel
objects.
"""
def __init__(self):
log.debug("In NodeB.__init__")
self.running = False
self.ready = event.Event()
self._lock = coros.RLock()
self._pool = IDPool()
self._bidir_pool = {} # maps inactive/active our numbers (from self._pool) to channels
self._pool_map = {} # maps active pika channel numbers to our numbers (from self._pool)
self.interceptors = {} # endpoint interceptors
amqp.Node.__init__(self)
def start_node(self):
"""
This should only be called by on_connection_opened.
so, maybe we don't need a start_node/stop_node interface
"""
log.debug("In start_node")
amqp.Node.start_node(self)
self.running = True
self.ready.set()
def stop_node(self):
"""
Closes the connection to the broker, cleans up resources held by this node.
"""
log.debug("NodeB.stop_node (running: %s)", self.running)
if self.running:
# clean up pooling before we shut connection
self._destroy_pool()
self.client.close()
self.running = False
def _destroy_pool(self):
"""
Explicitly deletes pooled queues in this Node.
"""
for chan in self._bidir_pool.itervalues():
chan._destroy_queue()
def _new_channel(self, ch_type, ch_number=None, **kwargs):
"""
Creates a pyon Channel based on the passed in type, and activates it for use.
"""
chan = ch_type(**kwargs)
amq_chan = blocking_cb(self.client.channel, 'on_open_callback', channel_number=ch_number)
if amq_chan is None:
log.error("AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s", ch_number)
import traceback
traceback.print_stack()
raise StandardError("AMQCHAN IS NONE THIS SHOULD NEVER HAPPEN, chan number requested: %s" % ch_number)
chan.on_channel_open(amq_chan)
return chan
def channel(self, ch_type, **kwargs):
"""
Creates a Channel object with an underlying transport callback and returns it.
@type ch_type BaseChannel
"""
log.debug("NodeB.channel")
with self._lock:
# having _queue_auto_delete on is a pre-req to being able to pool.
if ch_type == channel.BidirClientChannel and not ch_type._queue_auto_delete:
chid = self._pool.get_id()
if chid in self._bidir_pool:
log.debug("BidirClientChannel requested, pulling from pool (%d)", chid)
assert not chid in self._pool_map.values()
ch = self._bidir_pool[chid]
self._pool_map[ch.get_channel_id()] = chid
else:
log.debug("BidirClientChannel requested, no pool items available, creating new (%d)", chid)
ch = self._new_channel(ch_type, **kwargs)
ch.set_close_callback(self.on_channel_request_close)
self._bidir_pool[chid] = ch
self._pool_map[ch.get_channel_id()] = chid
else:
ch = self._new_channel(ch_type, **kwargs)
assert ch
return ch
def on_channel_request_close(self, ch):
"""
Close callback for pooled Channels.
When a new, pooled Channel is created that this Node manages, it will specify this as the
close callback in order to prevent that Channel from actually closing.
"""
log.debug("NodeB: on_channel_request_close\n\tChType %s, Ch#: %d", ch.__class__, ch.get_channel_id())
assert ch.get_channel_id() in self._pool_map
with self._lock:
chid = self._pool_map.pop(ch.get_channel_id())
log.debug("Releasing BiDir pool Pika #%d, our id #%d", ch.get_channel_id(), chid)
self._pool.release_id(chid)
# reset channel
ch.reset()
# sanity check: if auto delete got turned on, we must remove this channel from the pool
if ch._queue_auto_delete:
log.warn("A pooled channel now has _queue_auto_delete set true, we must remove it: check what caused this as it's likely a timing error")
self._bidir_pool.pop(chid)
self._pool._ids_free.remove(chid)
def setup_interceptors(self, interceptor_cfg):
stack = interceptor_cfg["stack"]
defs = interceptor_cfg["interceptors"]
interceptors = defaultdict(list)
by_name_dict = {}
for type_and_direction in stack:
interceptor_names = stack[type_and_direction]
for name in interceptor_names:
if name in by_name_dict:
classinst = by_name_dict[name]
else:
interceptor_def = defs[name]
# Instantiate and put in by_name array
modpath, classname = interceptor_def['class'].rsplit('.', 1)
classinst = for_name(modpath, classname)
# Call configure
classinst.configure(config = interceptor_def["config"] if "config" in interceptor_def else None)
# Put in by_name_dict for possible re-use
by_name_dict[name] = classinst
interceptors[type_and_direction].append(classinst)
self.interceptors = dict(interceptors)