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_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_random_startup_node():
    """
    Hard to test reliable for a random
    """
    s = [{"1": 1}, {"2": 2}, {"3": 3}],
    n = NodeManager(startup_nodes=s)
    random_node = n.random_startup_node()

    for i in range(0, 5):
        assert random_node in s

def test_keyslot():
    """
    Test that method will compute correct key in all supported cases
    """
    n = NodeManager([{}])

    assert n.keyslot("foo") == 12182
    assert n.keyslot("{foo}bar") == 12182
    assert n.keyslot("{foo}") == 12182
    assert n.keyslot(1337) == 4314

def test_random_startup_node_ittr():
    """
    Hard to test reliable for a random function
    """
    s = [{"1": 1}, {"2": 2}, {"3": 3}],
    n = NodeManager(startup_nodes=s)

    for i, node in enumerate(n.random_startup_node_ittr()):
        if i == 5:
            break
        assert node in s

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_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_determine_pubsub_node():
    """
    Given a set of nodes it should determine the same pubsub node each time.
    """
    n = NodeManager(startup_nodes=[{}])

    n.nodes = {
        "127.0.0.1:7001": {"host": "127.0.0.1", "port": 7001, "server_type": "master"},
        "127.0.0.1:7005": {"host": "127.0.0.1", "port": 7005, "server_type": "master"},
        "127.0.0.1:7000": {"host": "127.0.0.1", "port": 7000, "server_type": "master"},
        "127.0.0.1:7002": {"host": "127.0.0.1", "port": 7002, "server_type": "master"},
    }

    n.determine_pubsub_node()
    assert n.pubsub_node == {"host": "127.0.0.1", "port": 7005, "server_type": "master", "pubsub": True}

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 test_set_node():
    """
    Test to update data in a slot.
    """
    expected = {
        "host": "127.0.0.1",
        "name": "127.0.0.1:7000",
        "port": 7000,
        "server_type": "master",
    }

    n = NodeManager(startup_nodes=[{}])
    assert len(n.slots) == 0, "no slots should exist"
    res = n.set_node(host="127.0.0.1", port=7000, server_type="master")
    assert res == expected
    assert n.nodes == {expected['name']: expected}

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_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_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_keyslot():
    """
    Test that method will compute correct key in all supported cases
    """
    n = NodeManager([{}])

    assert n.keyslot("foo") == 12182
    assert n.keyslot("{foo}bar") == 12182
    assert n.keyslot("{foo}") == 12182
    assert n.keyslot(1337) == 4314

    assert n.keyslot(125) == n.keyslot(b"125")
    assert n.keyslot(125) == n.keyslot("\x31\x32\x35")
    assert n.keyslot("大奖") == n.keyslot(b"\xe5\xa4\xa7\xe5\xa5\x96")
    assert n.keyslot(u"大奖") == n.keyslot(b"\xe5\xa4\xa7\xe5\xa5\x96")
    assert n.keyslot(1337.1234) == n.keyslot("1337.1234")
    assert n.keyslot(1337) == n.keyslot("1337")
    assert n.keyslot(b"abc") == n.keyslot("abc")
    assert n.keyslot("abc") == n.keyslot(unicode("abc"))
    assert n.keyslot(unicode("abc")) == n.keyslot(b"abc")

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()