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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
import traceback
from qpid.queue import Empty
from qpid.datatypes import Message
from qpid.testlib import TestBase010
from qpid.session import SessionException
class AlternateExchangeTests(TestBase010):
"""
Tests for the new mechanism for message returns introduced in 0-10
and available in 0-9 for preview
"""
def test_unroutable(self):
"""
Test that unroutable messages are delivered to the alternate-exchange if specified
"""
session = self.session
#create an exchange with an alternate defined
session.exchange_declare(exchange="secondary", type="fanout")
session.exchange_declare(exchange="primary", type="direct", alternate_exchange="secondary")
#declare, bind (to the alternate exchange) and consume from a queue for 'returned' messages
session.queue_declare(queue="returns", exclusive=True, auto_delete=True)
session.exchange_bind(queue="returns", exchange="secondary")
session.message_subscribe(destination="a", queue="returns")
session.message_flow(destination="a", unit=session.credit_unit.message, value=0xFFFFFFFFL)
session.message_flow(destination="a", unit=session.credit_unit.byte, value=0xFFFFFFFFL)
returned = session.incoming("a")
#declare, bind (to the primary exchange) and consume from a queue for 'processed' messages
session.queue_declare(queue="processed", exclusive=True, auto_delete=True)
session.exchange_bind(queue="processed", exchange="primary", binding_key="my-key")
session.message_subscribe(destination="b", queue="processed")
session.message_flow(destination="b", unit=session.credit_unit.message, value=0xFFFFFFFFL)
session.message_flow(destination="b", unit=session.credit_unit.byte, value=0xFFFFFFFFL)
processed = session.incoming("b")
#publish to the primary exchange
#...one message that makes it to the 'processed' queue:
dp=self.session.delivery_properties(routing_key="my-key")
session.message_transfer(destination="primary", message=Message(dp, "Good"))
#...and one that does not:
dp=self.session.delivery_properties(routing_key="unused-key")
session.message_transfer(destination="primary", message=Message(dp, "Bad"))
#delete the exchanges
session.exchange_delete(exchange="primary")
session.exchange_delete(exchange="secondary")
#verify behaviour
self.assertEqual("Good", processed.get(timeout=1).body)
self.assertEqual("Bad", returned.get(timeout=1).body)
self.assertEmpty(processed)
self.assertEmpty(returned)
def test_queue_delete(self):
"""
Test that messages in a queue being deleted are delivered to the alternate-exchange if specified
"""
session = self.session
#set up a 'dead letter queue':
session.exchange_declare(exchange="dlq", type="fanout")
session.queue_declare(queue="deleted", exclusive=True, auto_delete=True)
session.exchange_bind(exchange="dlq", queue="deleted")
session.message_subscribe(destination="dlq", queue="deleted")
session.message_flow(destination="dlq", unit=session.credit_unit.message, value=0xFFFFFFFFL)
session.message_flow(destination="dlq", unit=session.credit_unit.byte, value=0xFFFFFFFFL)
dlq = session.incoming("dlq")
#create a queue using the dlq as its alternate exchange:
session.queue_declare(queue="delete-me", alternate_exchange="dlq")
#send it some messages:
dp=self.session.delivery_properties(routing_key="delete-me")
session.message_transfer(message=Message(dp, "One"))
session.message_transfer(message=Message(dp, "Two"))
session.message_transfer(message=Message(dp, "Three"))
#delete it:
session.queue_delete(queue="delete-me")
#delete the dlq exchange:
session.exchange_delete(exchange="dlq")
#check the messages were delivered to the dlq:
self.assertEqual("One", dlq.get(timeout=1).body)
self.assertEqual("Two", dlq.get(timeout=1).body)
self.assertEqual("Three", dlq.get(timeout=1).body)
self.assertEmpty(dlq)
def test_delete_while_used_by_queue(self):
"""
Ensure an exchange still in use as an alternate-exchange for a
queue can't be deleted
"""
session = self.session
session.exchange_declare(exchange="alternate", type="fanout")
session2 = self.conn.session("alternate", 2)
session2.queue_declare(queue="q", alternate_exchange="alternate")
try:
session2.exchange_delete(exchange="alternate")
self.fail("Expected deletion of in-use alternate-exchange to fail")
except SessionException, e:
session = self.session
session.queue_delete(queue="q")
session.exchange_delete(exchange="alternate")
self.assertEquals(530, e.args[0].error_code)
def test_delete_while_used_by_exchange(self):
"""
Ensure an exchange still in use as an alternate-exchange for
another exchange can't be deleted
"""
session = self.session
session.exchange_declare(exchange="alternate", type="fanout")
session = self.conn.session("alternate", 2)
session.exchange_declare(exchange="e", type="fanout", alternate_exchange="alternate")
try:
session.exchange_delete(exchange="alternate")
self.fail("Expected deletion of in-use alternate-exchange to fail")
except SessionException, e:
session = self.session
session.exchange_delete(exchange="e")
session.exchange_delete(exchange="alternate")
self.assertEquals(530, e.args[0].error_code)
def test_modify_existing_exchange_alternate(self):
"""
Ensure that attempting to modify an exhange to change
the alternate throws an exception
"""
session = self.session
session.exchange_declare(exchange="alt1", type="direct")
session.exchange_declare(exchange="alt2", type="direct")
session.exchange_declare(exchange="onealternate", type="fanout", alternate_exchange="alt1")
try:
# attempt to change the alternate on an already existing exchange
session.exchange_declare(exchange="onealternate", type="fanout", alternate_exchange="alt2")
self.fail("Expected changing an alternate on an existing exchange to fail")
except SessionException, e:
self.assertEquals(530, e.args[0].error_code)
session = self.conn.session("alternate", 2)
session.exchange_delete(exchange="onealternate")
session.exchange_delete(exchange="alt2")
session.exchange_delete(exchange="alt1")
def test_add_alternate_to_exchange(self):
"""
Ensure that attempting to modify an exhange by adding
an alternate throws an exception
"""
session = self.session
session.exchange_declare(exchange="alt1", type="direct")
session.exchange_declare(exchange="noalternate", type="fanout")
try:
# attempt to add an alternate on an already existing exchange
session.exchange_declare(exchange="noalternate", type="fanout", alternate_exchange="alt1")
self.fail("Expected adding an alternate on an existing exchange to fail")
except SessionException, e:
self.assertEquals(530, e.args[0].error_code)
session = self.conn.session("alternate", 2)
session.exchange_delete(exchange="noalternate")
session.exchange_delete(exchange="alt1")
def test_del_alternate_to_exchange(self):
"""
Ensure that attempting to modify an exhange by declaring
it again without an alternate does nothing
"""
session = self.session
session.exchange_declare(exchange="alt1", type="direct")
session.exchange_declare(exchange="onealternate", type="fanout", alternate_exchange="alt1")
# attempt to re-declare without an alternate - silently ignore
session.exchange_declare(exchange="onealternate", type="fanout" )
session.exchange_delete(exchange="onealternate")
session.exchange_delete(exchange="alt1")
def assertEmpty(self, queue):
try:
msg = queue.get(timeout=1)
self.fail("Queue not empty: " + msg)
except Empty: None
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