def _multi_send(method, context, topic, msg, timeout=None,
envelope=False, _msg_id=None, allowed_remote_exmods=None):
"""Wraps the sending of messages.
Dispatches to the matchmaker and sends message to all relevant hosts.
"""
allowed_remote_exmods = allowed_remote_exmods or []
conf = CONF
LOG.debug(' '.join(map(pformat, (topic, msg))))
queues = _get_matchmaker().queues(topic)
LOG.debug("Sending message(s) to: %s", queues)
# Don't stack if we have no matchmaker results
if not queues:
LOG.warn(_("No matchmaker results. Not casting."))
# While not strictly a timeout, callers know how to handle
# this exception and a timeout isn't too big a lie.
raise rpc_common.Timeout(_("No match from matchmaker."))
# This supports brokerless fanout (addresses > 1)
return_val = None
for queue in queues:
_topic, ip_addr = queue
_addr = "tcp://%s:%s" % (ip_addr, conf.rpc_zmq_port)
if method.__name__ == '_cast':
eventlet.spawn_n(method, _addr, context,
_topic, msg, timeout, envelope, _msg_id)
else:
return_val = method(_addr, context, _topic, msg, timeout,
envelope, allowed_remote_exmods)
return return_val
def _load_notifiers(self):
"""One-time load of notifier config file."""
self.routing_groups = {}
self.used_drivers = set()
filename = CONF.routing_notifier_config
if not filename:
return
# Infer which drivers are used from the config file.
self.routing_groups = yaml.load(
self._get_notifier_config_file(filename))
if not self.routing_groups:
self.routing_groups = {} # In case we got None from load()
return
for group in self.routing_groups.values():
self.used_drivers.update(group.keys())
LOG.debug(_('loading notifiers from %(namespace)s') %
{'namespace': self.NOTIFIER_PLUGIN_NAMESPACE})
self.plugin_manager = dispatch.DispatchExtensionManager(
namespace=self.NOTIFIER_PLUGIN_NAMESPACE,
check_func=self._should_load_plugin,
invoke_on_load=True,
invoke_args=None)
if not list(self.plugin_manager):
LOG.warning(_("Failed to load any notifiers "
"for %(namespace)s") %
{'namespace': self.NOTIFIER_PLUGIN_NAMESPACE})
def publisher(waiter):
LOG.info(_("Creating proxy for topic: %s"), topic)
try:
# The topic is received over the network,
# don't trust this input.
if self.badchars.search(topic) is not None:
emsg = _("Topic contained dangerous characters.")
LOG.warn(emsg)
raise RPCException(emsg)
out_sock = ZmqSocket("ipc://%s/zmq_topic_%s" %
(ipc_dir, topic),
sock_type, bind=True)
except RPCException:
waiter.send_exception(*sys.exc_info())
return
self.topic_proxy[topic] = eventlet.queue.LightQueue(
CONF.rpc_zmq_topic_backlog)
self.sockets.append(out_sock)
# It takes some time for a pub socket to open,
# before we can have any faith in doing a send() to it.
if sock_type == zmq.PUB:
eventlet.sleep(.5)
waiter.send(True)
while(True):
data = self.topic_proxy[topic].get()
out_sock.send(data, copy=False)
def _load_notifiers(self):
"""One-time load of notifier config file."""
self.routing_groups = {}
self.used_drivers = set()
filename = CONF.routing_notifier_config
if not filename:
return
# Infer which drivers are used from the config file.
self.routing_groups = yaml.load(
self._get_notifier_config_file(filename))
if not self.routing_groups:
self.routing_groups = {} # In case we got None from load()
return
for group in self.routing_groups.values():
self.used_drivers.update(group.keys())
LOG.debug(
_('loading notifiers from %(namespace)s') %
{'namespace': self.NOTIFIER_PLUGIN_NAMESPACE})
self.plugin_manager = dispatch.DispatchExtensionManager(
namespace=self.NOTIFIER_PLUGIN_NAMESPACE,
check_func=self._should_load_plugin,
invoke_on_load=True,
invoke_args=None)
if not list(self.plugin_manager):
LOG.warning(
_("Failed to load any notifiers "
"for %(namespace)s") %
{'namespace': self.NOTIFIER_PLUGIN_NAMESPACE})
def consume_in_thread(self):
"""Runs the ZmqProxy service."""
ipc_dir = CONF.rpc_zmq_ipc_dir
consume_in = "tcp://%s:%s" % \
(CONF.rpc_zmq_bind_address,
CONF.rpc_zmq_port)
consumption_proxy = InternalContext(None)
try:
os.makedirs(ipc_dir)
except os.error:
if not os.path.isdir(ipc_dir):
with excutils.save_and_reraise_exception():
LOG.error(
_("Required IPC directory does not exist at"
" %s"), ipc_dir)
try:
self.register(consumption_proxy, consume_in, zmq.PULL)
except zmq.ZMQError:
if os.access(ipc_dir, os.X_OK):
with excutils.save_and_reraise_exception():
LOG.error(_("Permission denied to IPC directory at"
" %s"), ipc_dir)
with excutils.save_and_reraise_exception():
LOG.error(
_("Could not create ZeroMQ receiver daemon. "
"Socket may already be in use."))
super(ZmqProxy, self).consume_in_thread()
def consume_in_thread(self):
"""Runs the ZmqProxy service."""
ipc_dir = CONF.rpc_zmq_ipc_dir
consume_in = "tcp://%s:%s" % \
(CONF.rpc_zmq_bind_address,
CONF.rpc_zmq_port)
consumption_proxy = InternalContext(None)
try:
os.makedirs(ipc_dir)
except os.error:
if not os.path.isdir(ipc_dir):
with excutils.save_and_reraise_exception():
LOG.error(_("Required IPC directory does not exist at"
" %s"), ipc_dir)
try:
self.register(consumption_proxy,
consume_in,
zmq.PULL)
except zmq.ZMQError:
if os.access(ipc_dir, os.X_OK):
with excutils.save_and_reraise_exception():
LOG.error(_("Permission denied to IPC directory at"
" %s"), ipc_dir)
with excutils.save_and_reraise_exception():
LOG.error(_("Could not create ZeroMQ receiver daemon. "
"Socket may already be in use."))
super(ZmqProxy, self).consume_in_thread()
def publisher(waiter):
LOG.info(_("Creating proxy for topic: %s"), topic)
try:
# The topic is received over the network,
# don't trust this input.
if self.badchars.search(topic) is not None:
emsg = _("Topic contained dangerous characters.")
LOG.warn(emsg)
raise RPCException(emsg)
out_sock = ZmqSocket("ipc://%s/zmq_topic_%s" %
(ipc_dir, topic),
sock_type,
bind=True)
except RPCException:
waiter.send_exception(*sys.exc_info())
return
self.topic_proxy[topic] = eventlet.queue.LightQueue(
CONF.rpc_zmq_topic_backlog)
self.sockets.append(out_sock)
# It takes some time for a pub socket to open,
# before we can have any faith in doing a send() to it.
if sock_type == zmq.PUB:
eventlet.sleep(.5)
waiter.send(True)
while (True):
data = self.topic_proxy[topic].get()
out_sock.send(data, copy=False)
def reconnect(self, retry=None):
"""Handles reconnecting and re-establishing sessions and queues.
Will retry up to retry number of times.
retry = None or -1 means to retry forever
retry = 0 means no retry
retry = N means N retries
"""
delay = 1
attempt = 0
loop_forever = False
if retry is None or retry < 0:
loop_forever = True
while True:
self._disconnect()
attempt += 1
broker = six.next(self.brokers)
try:
self._connect(broker)
except qpid_exceptions.MessagingError as e:
msg_dict = dict(e=e,
delay=delay,
retry=retry,
broker=broker)
if not loop_forever and attempt > retry:
msg = _('Unable to connect to AMQP server on '
'%(broker)s after %(retry)d '
'tries: %(e)s') % msg_dict
LOG.error(msg)
raise exceptions.MessageDeliveryFailure(msg)
else:
msg = _("Unable to connect to AMQP server on %(broker)s: "
"%(e)s. Sleeping %(delay)s seconds") % msg_dict
LOG.error(msg)
time.sleep(delay)
delay = min(delay + 1, 5)
else:
LOG.info(_('Connected to AMQP server on %s'), broker['host'])
break
self.session = self.connection.session()
if self.consumers:
consumers = self.consumers
self.consumers = {}
for consumer in six.itervalues(consumers):
consumer.reconnect(self.session)
self._register_consumer(consumer)
LOG.debug("Re-established AMQP queues")
def reconnect(self, retry=None):
"""Handles reconnecting and re-establishing sessions and queues.
Will retry up to retry number of times.
retry = None or -1 means to retry forever
retry = 0 means no retry
retry = N means N retries
"""
delay = 1
attempt = 0
loop_forever = False
if retry is None or retry < 0:
loop_forever = True
while True:
self._disconnect()
attempt += 1
broker = six.next(self.brokers)
try:
self._connect(broker)
except qpid_exceptions.MessagingError as e:
msg_dict = dict(e=e,
delay=delay,
retry=retry,
broker=broker)
if not loop_forever and attempt > retry:
msg = _('Unable to connect to AMQP server on '
'%(broker)s after %(retry)d '
'tries: %(e)s') % msg_dict
LOG.error(msg)
raise exceptions.MessageDeliveryFailure(msg)
else:
msg = _("Unable to connect to AMQP server on %(broker)s: "
"%(e)s. Sleeping %(delay)s seconds") % msg_dict
LOG.error(msg)
time.sleep(delay)
delay = min(delay + 1, 5)
else:
LOG.info(_('Connected to AMQP server on %s'), broker['host'])
break
self.session = self.connection.session()
if self.consumers:
consumers = self.consumers
self.consumers = {}
for consumer in six.itervalues(consumers):
consumer.reconnect(self.session)
self._register_consumer(consumer)
LOG.debug("Re-established AMQP queues")
def __init__(self, info=None, topic=None, method=None):
"""Initiates Timeout object.
:param info: Extra info to convey to the user
:param topic: The topic that the rpc call was sent to
:param rpc_method_name: The name of the rpc method being
called
"""
self.info = info
self.topic = topic
self.method = method
super(Timeout, self).__init__(None,
info=info or _('<unknown>'),
topic=topic or _('<unknown>'),
method=method or _('<unknown>'))
def _error_callback(exc):
if isinstance(exc, qpid_exceptions.Empty):
LOG.debug('Timed out waiting for RPC response: %s', exc)
raise rpc_common.Timeout()
else:
LOG.exception(_('Failed to consume message from queue: %s'),
exc)
def consume(self, sock):
# TODO(ewindisch): use zero-copy (i.e. references, not copying)
data = sock.recv()
LOG.debug("CONSUMER RECEIVED DATA: %s", data)
proxy = self.proxies[sock]
if data[2] == 'cast': # Legacy protocol
packenv = data[3]
ctx, msg = _deserialize(packenv)
request = rpc_common.deserialize_msg(msg)
ctx = RpcContext.unmarshal(ctx)
elif data[2] == 'impl_zmq_v2':
packenv = data[4:]
msg = unflatten_envelope(packenv)
request = rpc_common.deserialize_msg(msg)
# Unmarshal only after verifying the message.
ctx = RpcContext.unmarshal(data[3])
else:
LOG.error(_("ZMQ Envelope version unsupported or unknown."))
return
self.pool.spawn_n(self.process, proxy, ctx, request)
def _get_response(self, ctx, proxy, topic, data):
"""Process a curried message and cast the result to topic."""
LOG.debug("Running func with context: %s", ctx.to_dict())
data.setdefault('version', None)
data.setdefault('args', {})
try:
result = proxy.dispatch(ctx, data['version'], data['method'],
data.get('namespace'), **data['args'])
return ConsumerBase.normalize_reply(result, ctx.replies)
except greenlet.GreenletExit:
# ignore these since they are just from shutdowns
pass
except rpc_common.ClientException as e:
LOG.debug("Expected exception during message handling (%s)",
e._exc_info[1])
return {
'exc':
rpc_common.serialize_remote_exception(e._exc_info,
log_failure=False)
}
except Exception:
LOG.error(_("Exception during message handling"))
return {
'exc': rpc_common.serialize_remote_exception(sys.exc_info())
}
def __init__(self, addr, zmq_type, bind=True, subscribe=None):
self.sock = _get_ctxt().socket(zmq_type)
self.addr = addr
self.type = zmq_type
self.subscriptions = []
# Support failures on sending/receiving on wrong socket type.
self.can_recv = zmq_type in (zmq.PULL, zmq.SUB)
self.can_send = zmq_type in (zmq.PUSH, zmq.PUB)
self.can_sub = zmq_type in (zmq.SUB, )
# Support list, str, & None for subscribe arg (cast to list)
do_sub = {
list: subscribe,
str: [subscribe],
type(None): []
}[type(subscribe)]
for f in do_sub:
self.subscribe(f)
str_data = {'addr': addr, 'type': self.socket_s(),
'subscribe': subscribe, 'bind': bind}
LOG.debug("Connecting to %(addr)s with %(type)s", str_data)
LOG.debug("-> Subscribed to %(subscribe)s", str_data)
LOG.debug("-> bind: %(bind)s", str_data)
try:
if bind:
self.sock.bind(addr)
else:
self.sock.connect(addr)
except Exception:
raise RPCException(_("Could not open socket."))
def direct_send(self, msg_id, msg):
"""Send a 'direct' message."""
timer = rpc_common.DecayingTimer(duration=60)
timer.start()
# NOTE(sileht): retry at least 60sec, after we have a good change
# that the caller is really dead too...
while True:
try:
self.publisher_send(DirectPublisher, msg_id, msg)
except self.connection.channel_errors as exc:
# NOTE(noelbk/sileht):
# If rabbit dies, the consumer can be disconnected before the
# publisher sends, and if the consumer hasn't declared the
# queue, the publisher's will send a message to an exchange
# that's not bound to a queue, and the message wll be lost.
# So we set passive=True to the publisher exchange and catch
# the 404 kombu ChannelError and retry until the exchange
# appears
if exc.code == 404 and timer.check_return() > 0:
LOG.info(
_("The exchange to reply to %s doesn't "
"exist yet, retrying...") % msg_id)
time.sleep(1)
continue
raise
return
class Timeout(RPCException):
"""Signifies that a timeout has occurred.
This exception is raised if the rpc_response_timeout is reached while
waiting for a response from the remote side.
"""
msg_fmt = _('Timeout while waiting on RPC response - '
'topic: "%(topic)s", RPC method: "%(method)s" '
'info: "%(info)s"')
def __init__(self, info=None, topic=None, method=None):
"""Initiates Timeout object.
:param info: Extra info to convey to the user
:param topic: The topic that the rpc call was sent to
:param rpc_method_name: The name of the rpc method being
called
"""
self.info = info
self.topic = topic
self.method = method
super(Timeout, self).__init__(None,
info=info or _('<unknown>'),
topic=topic or _('<unknown>'),
method=method or _('<unknown>'))
def inner_func(*args, **kwargs):
last_log_time = 0
last_exc_message = None
exc_count = 0
while True:
try:
return infunc(*args, **kwargs)
except Exception as exc:
if exc.message == last_exc_message:
exc_count += 1
else:
exc_count = 1
# Do not log any more frequently than once a minute unless
# the exception message changes
cur_time = int(time.time())
if (cur_time - last_log_time > 60 or
exc.message != last_exc_message):
logging.exception(
_('Unexpected exception occurred %d time(s)... '
'retrying.') % exc_count)
last_log_time = cur_time
last_exc_message = exc.message
exc_count = 0
# This should be a very rare event. In case it isn't, do
# a sleep.
time.sleep(1)
def create_consumer(self, topic, proxy, fanout=False):
# Register with matchmaker.
_get_matchmaker().register(topic, CONF.rpc_zmq_host)
# Subscription scenarios
if fanout:
sock_type = zmq.SUB
subscribe = ('', fanout)[type(fanout) == str]
topic = 'fanout~' + topic.split('.', 1)[0]
else:
sock_type = zmq.PULL
subscribe = None
topic = '.'.join((topic.split('.', 1)[0], CONF.rpc_zmq_host))
if topic in self.topics:
LOG.info(_("Skipping topic registration. Already registered."))
return
# Receive messages from (local) proxy
inaddr = "ipc://%s/zmq_topic_%s" % \
(CONF.rpc_zmq_ipc_dir, topic)
LOG.debug("Consumer is a zmq.%s", ['PULL',
'SUB'][sock_type == zmq.SUB])
self.reactor.register(proxy,
inaddr,
sock_type,
subscribe=subscribe,
in_bind=False)
self.topics.append(topic)
def consume(self, sock):
# TODO(ewindisch): use zero-copy (i.e. references, not copying)
data = sock.recv()
LOG.debug("CONSUMER RECEIVED DATA: %s", data)
proxy = self.proxies[sock]
if data[2] == 'cast': # Legacy protocol
packenv = data[3]
ctx, msg = _deserialize(packenv)
request = rpc_common.deserialize_msg(msg)
ctx = RpcContext.unmarshal(ctx)
elif data[2] == 'impl_zmq_v2':
packenv = data[4:]
msg = unflatten_envelope(packenv)
request = rpc_common.deserialize_msg(msg)
# Unmarshal only after verifying the message.
ctx = RpcContext.unmarshal(data[3])
else:
LOG.error(_("ZMQ Envelope version unsupported or unknown."))
return
self.pool.spawn_n(self.process, proxy, ctx, request)
def _call_notify(self, ext, context, message, accepted_drivers):
"""Emit the notification.
"""
# accepted_drivers is passed in as a result of the map() function
LOG.info(_("Routing '%(event)s' notification to '%(driver)s' driver") %
{'event': message.get('event_type'), 'driver': ext.name})
ext.obj.notify(context, message)
def register(self, proxy, in_addr, zmq_type_in,
in_bind=True, subscribe=None):
LOG.info(_("Registering reactor"))
if zmq_type_in not in (zmq.PULL, zmq.SUB):
raise RPCException("Bad input socktype")
# Items push in.
inq = ZmqSocket(in_addr, zmq_type_in, bind=in_bind,
subscribe=subscribe)
self.proxies[inq] = proxy
self.sockets.append(inq)
LOG.info(_("In reactor registered"))
def __init__(self, info=None, topic=None, method=None):
"""Initiates Timeout object.
:param info: Extra info to convey to the user
:param topic: The topic that the rpc call was sent to
:param rpc_method_name: The name of the rpc method being
called
"""
self.info = info
self.topic = topic
self.method = method
super(Timeout, self).__init__(
None,
info=info or _('<unknown>'),
topic=topic or _('<unknown>'),
method=method or _('<unknown>'))
def _error_callback(exc):
if isinstance(exc, qpid_exceptions.Empty):
LOG.debug('Timed out waiting for RPC response: %s', exc)
raise rpc_common.Timeout()
else:
LOG.exception(_('Failed to consume message from queue: %s'),
exc)
def bool_from_string(subject, strict=False, default=False):
"""Interpret a string as a boolean.
A case-insensitive match is performed such that strings matching 't',
'true', 'on', 'y', 'yes', or '1' are considered True and, when
`strict=False`, anything else returns the value specified by 'default'.
Useful for JSON-decoded stuff and config file parsing.
If `strict=True`, unrecognized values, including None, will raise a
ValueError which is useful when parsing values passed in from an API call.
Strings yielding False are 'f', 'false', 'off', 'n', 'no', or '0'.
"""
if not isinstance(subject, six.string_types):
subject = six.text_type(subject)
lowered = subject.strip().lower()
if lowered in TRUE_STRINGS:
return True
elif lowered in FALSE_STRINGS:
return False
elif strict:
acceptable = ', '.join(
"'%s'" % s for s in sorted(TRUE_STRINGS + FALSE_STRINGS))
msg = _("Unrecognized value '%(val)s', acceptable values are:"
" %(acceptable)s") % {'val': subject,
'acceptable': acceptable}
raise ValueError(msg)
else:
return default
def create_consumer(self, topic, proxy, fanout=False):
# Register with matchmaker.
_get_matchmaker().register(topic, CONF.rpc_zmq_host)
# Subscription scenarios
if fanout:
sock_type = zmq.SUB
subscribe = ('', fanout)[type(fanout) == str]
topic = 'fanout~' + topic.split('.', 1)[0]
else:
sock_type = zmq.PULL
subscribe = None
topic = '.'.join((topic.split('.', 1)[0], CONF.rpc_zmq_host))
if topic in self.topics:
LOG.info(_("Skipping topic registration. Already registered."))
return
# Receive messages from (local) proxy
inaddr = "ipc://%s/zmq_topic_%s" % \
(CONF.rpc_zmq_ipc_dir, topic)
LOG.debug("Consumer is a zmq.%s",
['PULL', 'SUB'][sock_type == zmq.SUB])
self.reactor.register(proxy, inaddr, sock_type,
subscribe=subscribe, in_bind=False)
self.topics.append(topic)
def run(self, key):
if not self._ring_has(key):
LOG.warn(
_("No key defining hosts for topic '%s', "
"see ringfile"), key)
return []
host = next(self.ring0[key])
return [(key + '.' + host, host)]
def _error_callback(exc):
if isinstance(exc, socket.timeout):
LOG.debug('Timed out waiting for RPC response: %s', exc)
raise rpc_common.Timeout()
else:
LOG.exception(_('Failed to consume message from queue: %s'),
exc)
self.do_consume = True
def _error_callback(exc):
if isinstance(exc, socket.timeout):
LOG.debug('Timed out waiting for RPC response: %s', exc)
raise rpc_common.Timeout()
else:
LOG.exception(_('Failed to consume message from queue: %s'),
exc)
self.do_consume = True
def run(self, key):
# Assume starts with "fanout~", strip it for lookup.
nkey = key.split('fanout~')[1:][0]
if not self._ring_has(nkey):
LOG.warn(
_("No key defining hosts for topic '%s', "
"see ringfile"), nkey)
return []
return map(lambda x: (key + '.' + x, x), self.ring[nkey])
def consume(self):
"""Fetch the message and pass it to the callback object."""
message = self.receiver.fetch()
try:
self._unpack_json_msg(message)
self.callback(QpidMessage(self.session, message))
except Exception:
LOG.exception(_("Failed to process message... skipping it."))
self.session.acknowledge(message)
def run(self, key):
if not self._ring_has(key):
LOG.warn(
_("No key defining hosts for topic '%s', "
"see ringfile"), key
)
return []
host = next(self.ring0[key])
return [(key + '.' + host, host)]
def __exit__(self, exc_type, exc_val, exc_tb):
if exc_type is not None:
logging.error(_('Original exception being dropped: %s'),
traceback.format_exception(self.type_,
self.value,
self.tb))
return False
if self.reraise:
raise self.type_, self.value, self.tb
def consume(self):
"""Fetch the message and pass it to the callback object."""
message = self.receiver.fetch()
try:
self._unpack_json_msg(message)
self.callback(QpidMessage(self.session, message))
except Exception:
LOG.exception(_("Failed to process message... skipping it."))
self.session.acknowledge(message)
def string_to_bytes(text, unit_system='IEC', return_int=False):
"""Converts a string into an float representation of bytes.
The units supported for IEC ::
Kb(it), Kib(it), Mb(it), Mib(it), Gb(it), Gib(it), Tb(it), Tib(it)
KB, KiB, MB, MiB, GB, GiB, TB, TiB
The units supported for SI ::
kb(it), Mb(it), Gb(it), Tb(it)
kB, MB, GB, TB
Note that the SI unit system does not support capital letter 'K'
:param text: String input for bytes size conversion.
:param unit_system: Unit system for byte size conversion.
:param return_int: If True, returns integer representation of text
in bytes. (default: decimal)
:returns: Numerical representation of text in bytes.
:raises ValueError: If text has an invalid value.
"""
try:
base, reg_ex = UNIT_SYSTEM_INFO[unit_system]
except KeyError:
msg = _('Invalid unit system: "%s"') % unit_system
raise ValueError(msg)
match = reg_ex.match(text)
if match:
magnitude = float(match.group(1))
unit_prefix = match.group(2)
if match.group(3) in ['b', 'bit']:
magnitude /= 8
else:
msg = _('Invalid string format: %s') % text
raise ValueError(msg)
if not unit_prefix:
res = magnitude
else:
res = magnitude * pow(base, UNIT_PREFIX_EXPONENT[unit_prefix])
if return_int:
return int(math.ceil(res))
return res
def _call_notify(self, ext, context, message, accepted_drivers):
"""Emit the notification.
"""
# accepted_drivers is passed in as a result of the map() function
LOG.info(
_("Routing '%(event)s' notification to '%(driver)s' driver") % {
'event': message.get('event_type'),
'driver': ext.name
})
ext.obj.notify(context, message)
def unregister(self, key, host):
"""Unregister a topic."""
if (key, host) in self.host_topic:
del self.host_topic[(key, host)]
self.hosts.discard(host)
self.backend_unregister(key, '.'.join((key, host)))
LOG.info(_("Matchmaker unregistered: %(key)s, %(host)s"),
{'key': key, 'host': host})
def run(self, key):
# Assume starts with "fanout~", strip it for lookup.
nkey = key.split('fanout~')[1:][0]
if not self._ring_has(nkey):
LOG.warn(
_("No key defining hosts for topic '%s', "
"see ringfile"), nkey
)
return []
return map(lambda x: (key + '.' + x, x), self.ring[nkey])
def _get_matchmaker(*args, **kwargs):
global matchmaker
if not matchmaker:
mm = CONF.rpc_zmq_matchmaker
if mm.endswith('matchmaker.MatchMakerRing'):
mm.replace('matchmaker', 'matchmaker_ring')
LOG.warn(_('rpc_zmq_matchmaker = %(orig)s is deprecated; use'
' %(new)s instead') % dict(
orig=CONF.rpc_zmq_matchmaker, new=mm))
matchmaker = importutils.import_object(mm, *args, **kwargs)
return matchmaker
def _serialize(data):
"""Serialization wrapper.
We prefer using JSON, but it cannot encode all types.
Error if a developer passes us bad data.
"""
try:
return jsonutils.dumps(data, ensure_ascii=True)
except TypeError:
with excutils.save_and_reraise_exception():
LOG.error(_("JSON serialization failed."))
def _serialize(data):
"""Serialization wrapper.
We prefer using JSON, but it cannot encode all types.
Error if a developer passes us bad data.
"""
try:
return jsonutils.dumps(data, ensure_ascii=True)
except TypeError:
with excutils.save_and_reraise_exception():
LOG.error(_("JSON serialization failed."))
def _callback_handler(self, message, callback):
"""Call callback with deserialized message.
Messages that are processed and ack'ed.
"""
try:
callback(RabbitMessage(message))
except Exception:
LOG.exception(_("Failed to process message" " ... skipping it."))
message.ack()
def unregister(self, key, host):
"""Unregister a topic."""
if (key, host) in self.host_topic:
del self.host_topic[(key, host)]
self.hosts.discard(host)
self.backend_unregister(key, '.'.join((key, host)))
LOG.info(_("Matchmaker unregistered: %(key)s, %(host)s"), {
'key': key,
'host': host
})
def is_enabled():
cert_file = CONF.ssl.cert_file
key_file = CONF.ssl.key_file
ca_file = CONF.ssl.ca_file
use_ssl = cert_file or key_file
if cert_file and not os.path.exists(cert_file):
raise RuntimeError(_("Unable to find cert_file : %s") % cert_file)
if ca_file and not os.path.exists(ca_file):
raise RuntimeError(_("Unable to find ca_file : %s") % ca_file)
if key_file and not os.path.exists(key_file):
raise RuntimeError(_("Unable to find key_file : %s") % key_file)
if use_ssl and (not cert_file or not key_file):
raise RuntimeError(_("When running server in SSL mode, you must "
"specify both a cert_file and key_file "
"option value in your configuration file"))
return use_ssl
def _get_matchmaker(*args, **kwargs):
global matchmaker
if not matchmaker:
mm = CONF.rpc_zmq_matchmaker
if mm.endswith('matchmaker.MatchMakerRing'):
mm.replace('matchmaker', 'matchmaker_ring')
LOG.warn(
_('rpc_zmq_matchmaker = %(orig)s is deprecated; use'
' %(new)s instead') %
dict(orig=CONF.rpc_zmq_matchmaker, new=mm))
matchmaker = importutils.import_object(mm, *args, **kwargs)
return matchmaker
def _callback_handler(self, message, callback):
"""Call callback with deserialized message.
Messages that are processed and ack'ed.
"""
try:
callback(RabbitMessage(message))
except Exception:
LOG.exception(_("Failed to process message"
" ... skipping it."))
message.ack()
def _multi_send(method,
context,
topic,
msg,
timeout=None,
envelope=False,
_msg_id=None,
allowed_remote_exmods=None):
"""Wraps the sending of messages.
Dispatches to the matchmaker and sends message to all relevant hosts.
"""
allowed_remote_exmods = allowed_remote_exmods or []
conf = CONF
LOG.debug(' '.join(map(pformat, (topic, msg))))
queues = _get_matchmaker().queues(topic)
LOG.debug("Sending message(s) to: %s", queues)
# Don't stack if we have no matchmaker results
if not queues:
LOG.warn(_("No matchmaker results. Not casting."))
# While not strictly a timeout, callers know how to handle
# this exception and a timeout isn't too big a lie.
raise rpc_common.Timeout(_("No match from matchmaker."))
# This supports brokerless fanout (addresses > 1)
return_val = None
for queue in queues:
_topic, ip_addr = queue
_addr = "tcp://%s:%s" % (ip_addr, conf.rpc_zmq_port)
if method.__name__ == '_cast':
eventlet.spawn_n(method, _addr, context, _topic, msg, timeout,
envelope, _msg_id)
else:
return_val = method(_addr, context, _topic, msg, timeout, envelope,
allowed_remote_exmods)
return return_val
def register(self,
proxy,
in_addr,
zmq_type_in,
in_bind=True,
subscribe=None):
LOG.info(_("Registering reactor"))
if zmq_type_in not in (zmq.PULL, zmq.SUB):
raise RPCException("Bad input socktype")
# Items push in.
inq = ZmqSocket(in_addr,
zmq_type_in,
bind=in_bind,
subscribe=subscribe)
self.proxies[inq] = proxy
self.sockets.append(inq)
LOG.info(_("In reactor registered"))
def is_enabled():
cert_file = CONF.ssl.cert_file
key_file = CONF.ssl.key_file
ca_file = CONF.ssl.ca_file
use_ssl = cert_file or key_file
if cert_file and not os.path.exists(cert_file):
raise RuntimeError(_("Unable to find cert_file : %s") % cert_file)
if ca_file and not os.path.exists(ca_file):
raise RuntimeError(_("Unable to find ca_file : %s") % ca_file)
if key_file and not os.path.exists(key_file):
raise RuntimeError(_("Unable to find key_file : %s") % key_file)
if use_ssl and (not cert_file or not key_file):
raise RuntimeError(
_("When running server in SSL mode, you must "
"specify both a cert_file and key_file "
"option value in your configuration file"))
return use_ssl
def check_return(self, timeout_callback, *args, **kwargs):
maximum = kwargs.pop('maximum', None)
if self._duration is None:
return None if maximum is None else maximum
if self._ends_at is None:
raise RuntimeError(_("Can not check/return a timeout from a timer"
" that has not been started."))
left = self._ends_at - time.time()
if left <= 0:
timeout_callback(*args, **kwargs)
return left if maximum is None else min(left, maximum)
def check_return(self, timeout_callback=None, *args, **kwargs):
maximum = kwargs.pop('maximum', None)
if self._duration is None:
return None if maximum is None else maximum
if self._ends_at is None:
raise RuntimeError(
_("Can not check/return a timeout from a timer"
" that has not been started."))
left = self._ends_at - time.time()
if left <= 0 and timeout_callback is not None:
timeout_callback(*args, **kwargs)
return left if maximum is None else min(left, maximum)
def _connect(self, broker):
"""Connect to rabbit. Re-establish any queues that may have
been declared before if we are reconnecting. Exceptions should
be handled by the caller.
"""
LOG.info(_("Connecting to AMQP server on "
"%(hostname)s:%(port)d"), broker)
self.connection = kombu.connection.BrokerConnection(**broker)
self.connection_errors = self.connection.connection_errors
self.channel_errors = self.connection.channel_errors
if self.memory_transport:
# Kludge to speed up tests.
self.connection.transport.polling_interval = 0.0
self.do_consume = True
self.consumer_num = itertools.count(1)
self.connection.connect()
self.channel = self.connection.channel()
# work around 'memory' transport bug in 1.1.3
if self.memory_transport:
self.channel._new_queue('ae.undeliver')
for consumer in self.consumers:
consumer.reconnect(self.channel)
LOG.info(_('Connected to AMQP server on %(hostname)s:%(port)d'),
broker)
def _connect(self, broker):
"""Connect to rabbit. Re-establish any queues that may have
been declared before if we are reconnecting. Exceptions should
be handled by the caller.
"""
LOG.info(_("Connecting to AMQP server on "
"%(hostname)s:%(port)d"), broker)
self.connection = kombu.connection.BrokerConnection(**broker)
self.connection_errors = self.connection.connection_errors
self.channel_errors = self.connection.channel_errors
if self.memory_transport:
# Kludge to speed up tests.
self.connection.transport.polling_interval = 0.0
self.do_consume = True
self.consumer_num = itertools.count(1)
self.connection.connect()
self.channel = self.connection.channel()
# work around 'memory' transport bug in 1.1.3
if self.memory_transport:
self.channel._new_queue('ae.undeliver')
for consumer in self.consumers:
consumer.reconnect(self.channel)
LOG.info(_('Connected to AMQP server on %(hostname)s:%(port)d'),
broker)
def start_heartbeat(self):
"""Implementation of MatchMakerBase.start_heartbeat.
Launches greenthread looping send_heartbeats(),
yielding for CONF.matchmaker_heartbeat_freq seconds
between iterations.
"""
if not self.hosts:
raise MatchMakerException(_("Register before starting heartbeat."))
def do_heartbeat():
while True:
self.send_heartbeats()
eventlet.sleep(CONF.matchmaker_heartbeat_freq)
self._heart = eventlet.spawn(do_heartbeat)
def __init__(self, message=None, **kwargs):
self.kwargs = kwargs
if not message:
try:
message = self.msg_fmt % kwargs
except Exception:
# kwargs doesn't match a variable in the message
# log the issue and the kwargs
LOG.exception(_('Exception in string format operation'))
for name, value in six.iteritems(kwargs):
LOG.error("%s: %s", name, value)
# at least get the core message out if something happened
message = self.msg_fmt
super(RPCException, self).__init__(message)
def start_heartbeat(self):
"""Implementation of MatchMakerBase.start_heartbeat.
Launches greenthread looping send_heartbeats(),
yielding for CONF.matchmaker_heartbeat_freq seconds
between iterations.
"""
if not self.hosts:
raise MatchMakerException(
_("Register before starting heartbeat."))
def do_heartbeat():
while True:
self.send_heartbeats()
eventlet.sleep(CONF.matchmaker_heartbeat_freq)
self._heart = eventlet.spawn(do_heartbeat)
def _dispatch_and_reply(self, incoming):
try:
incoming.reply(self._dispatch(incoming.ctxt,
incoming.message))
except ExpectedException as e:
LOG.debug(u'Expected exception during message handling (%s)',
e.exc_info[1])
incoming.reply(failure=e.exc_info, log_failure=False)
except Exception as e:
# sys.exc_info() is deleted by LOG.exception().
exc_info = sys.exc_info()
LOG.error(_('Exception during message handling: %s'), e,
exc_info=exc_info)
incoming.reply(failure=exc_info)
# NOTE(dhellmann): Remove circular object reference
# between the current stack frame and the traceback in
# exc_info.
del exc_info
