def _process_data(self, msg_id, ctxt, method, args):
"""Thread that maigcally looks for a method on the proxy
object and calls it.
"""
node_func = getattr(self.proxy, str(method))
node_args = dict((str(k), v) for k, v in args.iteritems())
# NOTE(vish): magic is fun!
try:
rval = node_func(context=ctxt, **node_args)
if msg_id:
# Check if the result was a generator
if isinstance(rval, types.GeneratorType):
for x in rval:
msg_reply(msg_id, x, None)
else:
msg_reply(msg_id, rval, None)
# This final None tells multicall that it is done.
msg_reply(msg_id, None, None)
elif isinstance(rval, types.GeneratorType):
# NOTE(vish): this iterates through the generator
list(rval)
except Exception as e:
LOG.exception('Exception during message handling')
if msg_id:
msg_reply(msg_id, None, sys.exc_info())
return
def fetch(self, no_ack=None, auto_ack=None, enable_callbacks=False):
"""Wraps the parent fetch with some logic for failed connection."""
# TODO(vish): the logic for failed connections and logging should be
# refactored into some sort of connection manager object
try:
if self.failed_connection:
# NOTE(vish): connection is defined in the parent class, we can
# recreate it as long as we create the backend too
# pylint: disable=W0201
self.connection = Connection.recreate()
self.backend = self.connection.create_backend()
self.declare()
return super(Consumer, self).fetch(no_ack,
auto_ack,
enable_callbacks)
if self.failed_connection:
LOG.error(_('Reconnected to queue'))
self.failed_connection = False
# NOTE(vish): This is catching all errors because we really don't
# want exceptions to be logged 10 times a second if some
# persistent failure occurs.
except Exception, e: # pylint: disable=W0703
if not self.failed_connection:
LOG.exception(_('Failed to fetch message from queue: %s' % e))
self.failed_connection = True
def _process_data(self, msg_id, ctxt, method, args):
"""Thread that maigcally looks for a method on the proxy
object and calls it.
"""
node_func = getattr(self.proxy, str(method))
node_args = dict((str(k), v) for k, v in args.iteritems())
# NOTE(vish): magic is fun!
try:
rval = node_func(context=ctxt, **node_args)
if msg_id:
# Check if the result was a generator
if isinstance(rval, types.GeneratorType):
for x in rval:
msg_reply(msg_id, x, None)
else:
msg_reply(msg_id, rval, None)
# This final None tells multicall that it is done.
msg_reply(msg_id, None, None)
elif isinstance(rval, types.GeneratorType):
# NOTE(vish): this iterates through the generator
list(rval)
except Exception as e:
LOG.exception('Exception during message handling')
if msg_id:
msg_reply(msg_id, None, sys.exc_info())
return
def _error_callback(exc):
if isinstance(exc, qpid.messaging.exceptions.Empty):
LOG.exception(_('Timed out waiting for RPC response: %s') %
str(exc))
raise rpc_common.Timeout()
else:
LOG.exception(_('Failed to consume message from queue: %s') %
str(exc))
def _error_callback(exc):
if isinstance(exc, qpid.messaging.exceptions.Empty):
LOG.exception(
_('Timed out waiting for RPC response: %s') % str(exc))
raise rpc_common.Timeout()
else:
LOG.exception(
_('Failed to consume message from queue: %s') % str(exc))
def publisher_send(self, cls, topic, msg, **kwargs):
"""Send to a publisher based on the publisher class"""
while True:
try:
publisher = cls(self.channel, topic, **kwargs)
publisher.send(msg)
return
except self.connection.connection_errors, e:
LOG.exception(_('Failed to publish message %s' % str(e)))
try:
self.reconnect()
except self.connection.connection_errors, e:
pass
def publisher_send(self, cls, topic, msg, **kwargs):
"""Send to a publisher based on the publisher class"""
while True:
try:
publisher = cls(self.channel, topic, **kwargs)
publisher.send(msg)
return
except self.connection.connection_errors, e:
LOG.exception(_('Failed to publish message %s' % str(e)))
try:
self.reconnect()
except self.connection.connection_errors, e:
pass
def iterconsume(self, limit=None):
"""Return an iterator that will consume from all queues/consumers"""
while True:
try:
queues_head = self.consumers[:-1]
queues_tail = self.consumers[-1]
for queue in queues_head:
queue.consume(nowait=True)
queues_tail.consume(nowait=False)
for iteration in itertools.count(0):
if limit and iteration >= limit:
raise StopIteration
yield self.connection.drain_events()
except self.connection.connection_errors, e:
LOG.exception(_("Failed to consume message from queue: " "%s" % str(e)))
self.reconnect()
def iterconsume(self, limit=None):
"""Return an iterator that will consume from all queues/consumers"""
while True:
try:
queues_head = self.consumers[:-1]
queues_tail = self.consumers[-1]
for queue in queues_head:
queue.consume(nowait=True)
queues_tail.consume(nowait=False)
for iteration in itertools.count(0):
if limit and iteration >= limit:
raise StopIteration
yield self.connection.drain_events()
except self.connection.connection_errors, e:
LOG.exception(_('Failed to consume message from queue: '
'%s' % str(e)))
self.reconnect()
def wait(self, limit=None):
running = True
while running:
it = self.consumer_set.iterconsume(limit=limit)
if not it:
break
while True:
try:
it.next()
except StopIteration:
return
except greenlet.GreenletExit:
running = False
break
except Exception as e:
LOG.exception(_("Exception while processing consumer"))
self.reconnect()
# Break to outer loop
break
def _process_data(self, ctxt, method, args):
"""Thread that magically looks for a method on the proxy
object and calls it.
"""
try:
node_func = getattr(self.proxy, str(method))
node_args = dict((str(k), v) for k, v in args.iteritems())
# NOTE(vish): magic is fun!
rval = node_func(context=ctxt, **node_args)
# Check if the result was a generator
if inspect.isgenerator(rval):
for x in rval:
ctxt.reply(x, None)
else:
ctxt.reply(rval, None)
# This final None tells multicall that it is done.
ctxt.reply(ending=True)
except Exception as e:
LOG.exception("Exception during message handling")
ctxt.reply(None, sys.exc_info())
return
def _process_data(self, ctxt, method, args):
"""Thread that magically looks for a method on the proxy
object and calls it.
"""
node_func = getattr(self.proxy, str(method))
node_args = dict((str(k), v) for k, v in args.iteritems())
# NOTE(vish): magic is fun!
try:
rval = node_func(context=ctxt, **node_args)
# Check if the result was a generator
if inspect.isgenerator(rval):
for x in rval:
ctxt.reply(x, None)
else:
ctxt.reply(rval, None)
# This final None tells multicall that it is done.
ctxt.reply(ending=True)
except Exception as e:
LOG.exception('Exception during message handling')
ctxt.reply(None, sys.exc_info())
return
def _connect_error(exc):
log_info = {'topic': topic, 'err_str': str(exc)}
LOG.exception(_("Failed to publish message to topic "
"'%(topic)s': %(err_str)s") % log_info)
def _error_callback(exc):
LOG.exception(_('Failed to consume message from queue: %s') %
str(exc))
def _connect_error(exc):
log_info = {'topic': topic, 'err_str': str(exc)}
LOG.exception(
_("Failed to publish message to topic "
"'%(topic)s': %(err_str)s") % log_info)
def _error_callback(exc):
LOG.exception(
_('Failed to consume message from queue: %s') % str(exc))
