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import functools
import logging
import os
import random
import socket
import string
import time
import unittest2
import uuid
from kafka.common import OffsetRequest
from kafka import KafkaClient
__all__ = [
'random_string',
'ensure_topic_creation',
'get_open_port',
'kafka_versions',
'KafkaIntegrationTestCase',
'Timer',
]
def random_string(l):
s = "".join(random.choice(string.letters) for i in xrange(l))
return s
def kafka_versions(*versions):
def kafka_versions(func):
@functools.wraps(func)
def wrapper(self):
kafka_version = os.environ.get('KAFKA_VERSION')
if not kafka_version:
self.skipTest("no kafka version specified")
elif 'all' not in versions and kafka_version not in versions:
self.skipTest("unsupported kafka version")
return func(self)
return wrapper
return kafka_versions
def ensure_topic_creation(client, topic_name, timeout = 30):
start_time = time.time()
client.load_metadata_for_topics(topic_name)
while not client.has_metadata_for_topic(topic_name):
if time.time() > start_time + timeout:
raise Exception("Unable to create topic %s" % topic_name)
client.load_metadata_for_topics(topic_name)
time.sleep(1)
def get_open_port():
sock = socket.socket()
sock.bind(("", 0))
port = sock.getsockname()[1]
sock.close()
return port
class KafkaIntegrationTestCase(unittest2.TestCase):
create_client = True
topic = None
def setUp(self):
super(KafkaIntegrationTestCase, self).setUp()
if not os.environ.get('KAFKA_VERSION'):
return
if not self.topic:
self.topic = "%s-%s" % (self.id()[self.id().rindex(".") + 1:], random_string(10))
if self.create_client:
self.client = KafkaClient('%s:%d' % (self.server.host, self.server.port))
ensure_topic_creation(self.client, self.topic)
self._messages = {}
def tearDown(self):
super(KafkaIntegrationTestCase, self).tearDown()
if not os.environ.get('KAFKA_VERSION'):
return
if self.create_client:
self.client.close()
def current_offset(self, topic, partition):
offsets, = self.client.send_offset_request([ OffsetRequest(topic, partition, -1, 1) ])
return offsets.offsets[0]
def msgs(self, iterable):
return [ self.msg(x) for x in iterable ]
def msg(self, s):
if s not in self._messages:
self._messages[s] = '%s-%s-%s' % (s, self.id(), str(uuid.uuid4()))
return self._messages[s]
class Timer(object):
def __enter__(self):
self.start = time.time()
return self
def __exit__(self, *args):
self.end = time.time()
self.interval = self.end - self.start
logging.basicConfig(level=logging.DEBUG)
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