def test_init_with_down_node():
"""
If I can't connect to one of the nodes, everything should still work.
But if I can't connect to any of the nodes, exception should be thrown.
"""
def get_redis_link(host, port, decode_responses=False):
if port == 7000:
raise ConnectionError('mock connection error for 7000')
return StrictRedis(host=host,
port=port,
decode_responses=decode_responses)
with patch.object(NodeManager,
'get_redis_link',
side_effect=get_redis_link):
n = NodeManager(startup_nodes=[{
"host": "127.0.0.1",
"port": 7000
}, {
"host": "127.0.0.1",
"port": 7001
}])
n.initialize()
assert len(n.slots) == NodeManager.RedisClusterHashSlots
assert len(n.nodes) == 6
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7000}])
with pytest.raises(RedisClusterException) as e:
n.initialize()
assert 'Redis Cluster cannot be connected' in unicode(e.value)
def test_cluster_one_instance():
"""
If the cluster exists of only 1 node then there is some hacks that must
be validated they work.
"""
with patch.object(Redis, 'execute_command') as mock_execute_command:
return_data = [[0, 16383, ['', 7006]]]
def patch_execute_command(*args, **kwargs):
if args == ('CONFIG GET', 'cluster-require-full-coverage'):
return {'cluster-require-full-coverage': 'yes'}
else:
return return_data
# mock_execute_command.return_value = return_data
mock_execute_command.side_effect = patch_execute_command
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7006}])
n.initialize()
assert n.nodes == {"127.0.0.1:7006": {
'host': '127.0.0.1',
'name': '127.0.0.1:7006',
'port': 7006,
'server_type': 'master',
}}
assert len(n.slots) == 16384
for i in range(0, 16384):
assert n.slots[i] == [{
"host": "127.0.0.1",
"name": "127.0.0.1:7006",
"port": 7006,
"server_type": "master",
}]
def test_cluster_one_instance():
"""
If the cluster exists of only 1 node then there is some hacks that must
be validated they work.
"""
with patch.object(StrictRedis, 'execute_command') as mock_execute_command:
return_data = [[0, 16383, ['', 7006]]]
mock_execute_command.return_value = return_data
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7006}])
n.initialize()
assert n.nodes == {"127.0.0.1:7006": {
'host': '127.0.0.1',
'name': '127.0.0.1:7006',
'port': 7006,
'server_type': 'master',
}}
assert len(n.slots) == 16384
assert n.slots[0] == {
"host": "127.0.0.1",
"name": "127.0.0.1:7006",
"port": 7006,
"server_type": "master",
}
def test_cluster_slots_error_expected_responseerror():
"""
Check that exception is not raised if initialize can't execute
'CLUSTER SLOTS' command but can hit other nodes.
"""
with patch.object(Redis, 'execute_command') as execute_command_mock:
execute_command_mock.side_effect = ResponseError("MASTERDOWN")
with pytest.raises(RedisClusterException):
n = NodeManager(startup_nodes=[
{
"host": "127.0.0.1",
"port": 7000
},
])
n.initialize()
try:
n = NodeManager(startup_nodes=[
{
"host": "127.0.0.1",
"port": 7000
},
])
n.initialize()
except RedisClusterException as e:
assert "Redis Cluster cannot be connected" in e.args[0]
def test_initialize_follow_cluster():
n = NodeManager(
nodemanager_follow_cluster=True,
startup_nodes=[{'host': '127.0.0.1', 'port': 7000}]
)
n.orig_startup_nodes = None
n.initialize()
def test_cluster_one_instance():
"""
If the cluster exists of only 1 node then there is some hacks that must
be validated they work.
"""
with patch.object(StrictRedis, 'execute_command') as mock_execute_command:
return_data = [[0, 16383, ['', 7006]]]
def patch_execute_command(*args, **kwargs):
if args == ('CONFIG GET', 'cluster-require-full-coverage'):
return {'cluster-require-full-coverage': 'yes'}
else:
return return_data
# mock_execute_command.return_value = return_data
mock_execute_command.side_effect = patch_execute_command
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7006}])
n.initialize()
assert n.nodes == {"127.0.0.1:7006": {
'host': '127.0.0.1',
'name': '127.0.0.1:7006',
'port': 7006,
'server_type': 'master',
}}
assert len(n.slots) == 16384
for i in range(0, 16384):
assert n.slots[i] == [{
"host": "127.0.0.1",
"name": "127.0.0.1:7006",
"port": 7006,
"server_type": "master",
}]
def test_cluster_one_instance():
"""
If the cluster exists of only 1 node then there is some hacks that must
be validated they work.
"""
with patch.object(StrictRedis, 'execute_command') as mock_execute_command:
return_data = [[0, 16383, ['', 7006]]]
mock_execute_command.return_value = return_data
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7006}])
n.initialize()
assert n.nodes == {
"127.0.0.1:7006": {
'host': '127.0.0.1',
'name': '127.0.0.1:7006',
'port': 7006,
'server_type': 'master',
}
}
assert len(n.slots) == 16384
assert n.slots[0] == {
"host": "127.0.0.1",
"name": "127.0.0.1:7006",
"port": 7006,
"server_type": "master",
}
def test_init_slots_cache_slots_collision():
"""
Test that if 2 nodes do not agree on the same slots setup it should raise an error.
In this test both nodes will say that the first slots block should be bound to different
servers.
"""
n = NodeManager(startup_nodes=[
{
"host": "127.0.0.1",
"port": 7000
},
{
"host": "127.0.0.1",
"port": 7001
},
])
def monkey_link(host=None, port=None, *args, **kwargs):
"""
Helper function to return custom slots cache data from different redis nodes
"""
if port == 7000:
result = [[0, 5460, [b'127.0.0.1', 7000], [b'127.0.0.1', 7003]],
[
5461, 10922, [b'127.0.0.1', 7001],
[b'127.0.0.1', 7004]
]]
elif port == 7001:
result = [[0, 5460, [b'127.0.0.1', 7001], [b'127.0.0.1', 7003]],
[
5461, 10922, [b'127.0.0.1', 7000],
[b'127.0.0.1', 7004]
]]
else:
result = []
r = RedisCluster(host=host, port=port, decode_responses=True)
orig_execute_command = r.execute_command
def execute_command(*args, **kwargs):
if args == ("cluster", "slots"):
return result
elif args == ('CONFIG GET', 'cluster-require-full-coverage'):
return {'cluster-require-full-coverage': 'yes'}
else:
return orig_execute_command(*args, **kwargs)
r.execute_command = execute_command
return r
n.get_redis_link = monkey_link
with pytest.raises(RedisClusterException) as ex:
n.initialize()
assert unicode(ex.value).startswith(
"startup_nodes could not agree on a valid slots cache."), unicode(
ex.value)
def test_all_nodes():
"""
Set a list of nodes and it should be possible to itterate over all
"""
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7000}])
n.initialize()
nodes = [node for node in n.nodes.values()]
for i, node in enumerate(n.all_nodes()):
assert node in nodes
def test_all_nodes():
"""
Set a list of nodes and it should be possible to itterate over all
"""
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7000}])
n.initialize()
nodes = [node for node in n.nodes.values()]
for i, node in enumerate(n.all_nodes()):
assert node in nodes
def test_cluster_slots_error():
"""
Check that exception is raised if initialize can't execute
'CLUSTER SLOTS' command.
"""
with patch.object(StrictRedisCluster, 'execute_command') as execute_command_mock:
execute_command_mock.side_effect = Exception("foobar")
n = NodeManager(startup_nodes=[{}])
with pytest.raises(RedisClusterException):
n.initialize()
def test_all_nodes_masters():
"""
Set a list of nodes with random masters/slaves config and it shold be possible
to itterate over all of them.
"""
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7000}, {"host": "127.0.0.1", "port": 7001}])
n.initialize()
nodes = [node for node in n.nodes.values() if node['server_type'] == 'master']
for node in n.all_masters():
assert node in nodes
def test_cluster_slots_error():
"""
Check that exception is raised if initialize can't execute
'CLUSTER SLOTS' command.
"""
with patch.object(StrictRedisCluster, 'execute_command') as execute_command_mock:
execute_command_mock.side_effect = Exception("foobar")
n = NodeManager(startup_nodes=[{}])
with pytest.raises(RedisClusterException):
n.initialize()
def test_all_nodes_masters():
"""
Set a list of nodes with random masters/slaves config and it shold be possible
to itterate over all of them.
"""
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7000}, {"host": "127.0.0.1", "port": 7001}])
n.initialize()
nodes = [node for node in n.nodes.values() if node['server_type'] == 'master']
for node in n.all_masters():
assert node in nodes
def test_cluster_slots_error():
"""
Check that exception is raised if initialize can't execute
'CLUSTER SLOTS' command.
"""
with patch.object(Redis, 'execute_command') as execute_command_mock:
execute_command_mock.side_effect = Exception("foobar")
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7000}])
with pytest.raises(RedisClusterException) as e:
n.initialize()
assert "ERROR sending 'cluster slots' command" in unicode(e)
def test_flush_slots_nodes_cache():
"""
Slots cache should already be populated.
"""
n = NodeManager([{"host": "127.0.0.1", "port": 7000}])
n.initialize()
assert len(n.slots) == NodeManager.RedisClusterHashSlots
assert len(n.nodes) == 6
n.flush_slots_cache()
n.flush_nodes_cache()
assert len(n.slots) == 0
assert len(n.nodes) == 0
def test_flush_slots_nodes_cache():
"""
Slots cache should already be populated.
"""
n = NodeManager([{"host": "127.0.0.1", "port": 7000}])
n.initialize()
assert len(n.slots) == NodeManager.RedisClusterHashSlots
assert len(n.nodes) == 6
n.flush_slots_cache()
n.flush_nodes_cache()
assert len(n.slots) == 0
assert len(n.nodes) == 0
def test_init_with_down_node():
"""
If I can't connect to one of the nodes, everything should still work.
But if I can't connect to any of the nodes, exception should be thrown.
"""
def get_redis_link(host, port, decode_responses=False):
if port == 7000:
raise ConnectionError('mock connection error for 7000')
return StrictRedis(host=host, port=port, decode_responses=decode_responses)
with patch.object(NodeManager, 'get_redis_link', side_effect=get_redis_link):
n = NodeManager(startup_nodes=[{"host": "127.0.0.1", "port": 7000}])
with pytest.raises(RedisClusterException) as e:
n.initialize()
assert 'Redis Cluster cannot be connected' in unicode(e.value)
def get_redis(startup_host, startup_port):
startup_nodes = [
{
"host": startup_host,
"port": startup_port
},
]
nodemanager = NodeManager(startup_nodes=startup_nodes)
nodemanager.initialize()
rs = {}
for node, config in nodemanager.nodes.items():
rs[node] = redis.Redis(host=config["host"],
port=config["port"],
decode_responses=False)
return rs, nodemanager
def test_reset():
"""
Test that reset method resets variables back to correct default values.
"""
n = NodeManager(startup_nodes=[{}])
n.initialize = Mock()
n.reset()
assert n.initialize.call_count == 1
def test_reset():
"""
Test that reset method resets variables back to correct default values.
"""
n = NodeManager(startup_nodes=[{}])
n.initialize = Mock()
n.reset()
assert n.initialize.call_count == 1
def test_init_slots_cache_slots_collision():
"""
Test that if 2 nodes do not agree on the same slots setup it should raise an error.
In this test both nodes will say that the first slots block should be bound to different
servers.
"""
n = NodeManager(startup_nodes=[
{"host": "127.0.0.1", "port": 7000},
{"host": "127.0.0.1", "port": 7001},
])
def monkey_link(host=None, port=None, *args, **kwargs):
"""
Helper function to return custom slots cache data from different redis nodes
"""
if port == 7000:
result = [[0, 5460, [b'127.0.0.1', 7000], [b'127.0.0.1', 7003]],
[5461, 10922, [b'127.0.0.1', 7001], [b'127.0.0.1', 7004]]]
elif port == 7001:
result = [[0, 5460, [b'127.0.0.1', 7001], [b'127.0.0.1', 7003]],
[5461, 10922, [b'127.0.0.1', 7000], [b'127.0.0.1', 7004]]]
else:
result = []
r = StrictRedisCluster(host=host, port=port, decode_responses=True)
orig_execute_command = r.execute_command
def execute_command(*args, **kwargs):
if args == ("cluster", "slots"):
return result
elif args == ('CONFIG GET', 'cluster-require-full-coverage'):
return {'cluster-require-full-coverage': 'yes'}
else:
return orig_execute_command(*args, **kwargs)
r.execute_command = execute_command
return r
n.get_redis_link = monkey_link
with pytest.raises(RedisClusterException) as ex:
n.initialize()
assert unicode(ex.value).startswith("startup_nodes could not agree on a valid slots cache."), unicode(ex.value)
def test_reset():
"""
Test that reset method resets variables back to correct default values.
"""
n = NodeManager(startup_nodes=[{}])
n.initialize = Mock()
n.slots = {"foo": "bar"}
n.nodes = ["foo", "bar"]
n.reset()
assert n.slots == {}
assert n.nodes == {}
def test_reset():
"""
Test that reset method resets variables back to correct default values.
"""
n = NodeManager(startup_nodes=[{}])
n.initialize = Mock()
n.slots = {"foo": "bar"}
n.nodes = ["foo", "bar"]
n.reset()
assert n.slots == {}
assert n.nodes == {}
class RedisCluster(object):
"""RedisCluster"""
def __init__(self, startup_nodes):
self.nodemanager = NodeManager(startup_nodes=startup_nodes)
self.nodemanager.initialize()
self.redis_worker = {}
for node, config in self.nodemanager.nodes.items():
rdp = BlockingConnectionPool(host=config["host"],
port=config["port"])
self.redis_worker[node] = {
"worker": StrictRedis(connection_pool=rdp,
decode_responses=False),
"type": config["server_type"]
}
def get(self, key):
"""get"""
slot = self.nodemanager.keyslot(key)
node = np.random.choice(self.nodemanager.slots[slot])
worker = self.redis_worker[node['name']]
if worker["type"] == "slave":
worker["worker"].execute_command("READONLY")
return worker["worker"].get(key)
def hmget(self, key, fields):
"""hmget"""
while True:
retry = 0
try:
slot = self.nodemanager.keyslot(key)
node = np.random.choice(self.nodemanager.slots[slot])
worker = self.redis_worker[node['name']]
if worker["type"] == "slave":
worker["worker"].execute_command("READONLY")
ret = worker["worker"].hmget(key, fields)
break
except Exception as e:
retry += 1
if retry > 5:
raise e
print("RETRY hmget after 1 sec. Retry Time %s" % retry)
time.sleep(1)
return ret
def hmget_sample(self, key, fields, sample):
"""hmget_sample"""
while True:
retry = 0
try:
slot = self.nodemanager.keyslot(key)
node = np.random.choice(self.nodemanager.slots[slot])
worker = self.redis_worker[node['name']]
if worker["type"] == "slave":
worker["worker"].execute_command("READONLY")
func = worker["worker"].register_script(LUA_SCRIPT)
ret = func(keys=[key],
args=[np.random.randint(4294967295), sample] +
fields)
break
except Exception as e:
retry += 1
if retry > 5:
raise e
print("RETRY hmget_sample after 1 sec. Retry Time %s" % retry)
time.sleep(1)
return ret
def test_initialize_follow_cluster():
n = NodeManager(nodemanager_follow_cluster=True, startup_nodes=[{'host': '127.0.0.1', 'port': 7000}])
n.orig_startup_nodes = None
n.initialize()
