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zookeeper_tests.py
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zookeeper_tests.py
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try:
import unittest2 as unittest
except ImportError:
import unittest
import json
from mock import patch, Mock, call
from kazoo import client, exceptions
from lighthouse.zookeeper import ZookeeperDiscovery
@patch("lighthouse.zookeeper.client")
class ZookeeperTests(unittest.TestCase):
def test_validate_dependencies(self, mock_client):
self.assertEqual(ZookeeperDiscovery.validate_dependencies(), True)
def test_host_and_path_attributes(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
self.assertEqual(zk.hosts, ["zk01.int", "zk02.int"])
self.assertEqual(zk.base_path, "/lighthouse")
def test_config_with_no_hosts(self, mock_client):
self.assertRaises(
ValueError,
ZookeeperDiscovery.validate_config, {"path": "/lighthouse"}
)
def test_config_with_no_path(self, mock_client):
self.assertRaises(
ValueError,
ZookeeperDiscovery.validate_config,
{"hosts": ["zk01.int", "zk02.int"]}
)
def test_not_connected_by_default(self, mock_client):
zk = ZookeeperDiscovery()
self.assertEqual(zk.connected.is_set(), False)
def test_connect_via_kazoo_client(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
self.assertEqual(zk.client, mock_client.KazooClient.return_value)
mock_client.KazooClient.assert_called_once_with(
hosts="zk01.int,zk02.int"
)
zk.client.start_async.assert_called_once_with()
zk.client.add_listener.assert_called_once_with(
zk.handle_connection_change
)
def test_apply_config_alters_hosts_and_path(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
self.assertEqual(zk.hosts, ["zk01.int", "zk02.int"])
self.assertEqual(zk.base_path, "/lighthouse")
zk.connect()
zk.apply_config({
"hosts": ["zk02.int", "zk03.int"], "path": "/services"
})
self.assertEqual(zk.hosts, ["zk02.int", "zk03.int"])
self.assertEqual(zk.base_path, "/services")
def test_apply_config_updates_kazoo_hosts(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
self.assertEqual(zk.hosts, ["zk01.int", "zk02.int"])
self.assertEqual(zk.base_path, "/lighthouse")
zk.connect()
zk.connected.set()
zk.apply_config({
"hosts": ["zk02.int", "zk03.int"], "path": "/services"
})
zk.client.set_hosts.assert_called_once_with(
"zk02.int,zk03.int"
)
def test_handle_connection_lost(self, mock_client):
mock_client.KazooState = client.KazooState
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
zk.handle_connection_change(client.KazooState.LOST)
self.assertEqual(zk.connected.is_set(), False)
def test_handle_connection_lost_shutdown_set(self, mock_client):
mock_client.KazooState = client.KazooState
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
zk.shutdown.set()
zk.handle_connection_change(client.KazooState.LOST)
self.assertEqual(zk.connected.is_set(), False)
def test_handle_connection_suspended(self, mock_client):
mock_client.KazooState = client.KazooState
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
zk.handle_connection_change(client.KazooState.SUSPENDED)
self.assertEqual(zk.connected.is_set(), False)
def test_handle_connection_reestablished(self, mock_client):
mock_client.KazooState = client.KazooState
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
zk.handle_connection_change(client.KazooState.LOST)
self.assertEqual(zk.connected.is_set(), False)
zk.handle_connection_change(client.KazooState.CONNECTED)
self.assertEqual(zk.connected.is_set(), True)
def test_disconnect_stops_and_closes_client(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.disconnect()
zk.client.stop.assert_called_once_with()
zk.client.close.assert_called_once_with()
@patch("lighthouse.zookeeper.wait_on_any")
def test_report_up_waits_until_connected(self, wait_on_any, mock_client):
service = Mock(metadata={})
service.name = "app03"
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.report_up(service, 8888)
args, _ = wait_on_any.call_args
self.assertIn(zk.connected, args)
@patch("lighthouse.peer.socket")
@patch("lighthouse.node.socket")
def test_report_up(self, mock_socket, peer_socket, mock_client):
mock_socket.getfqdn.return_value = "redis1.int.local"
mock_socket.gethostbyname.return_value = "10.0.1.8"
peer_socket.getfqdn.return_value = "redis1.int.local"
peer_socket.gethostbyname.return_value = "10.0.1.8"
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
znode = Mock(owner_session_id="0x1234")
zk.client.exists.return_value = znode
zk.client.client_id = (znode.owner_session_id, "asf")
service = Mock(metadata={"type": "master"})
service.name = "webcache"
zk.report_up(service, 6379)
set_args, set_kwargs = zk.client.set.call_args
path, data = set_args
data = json.loads(data.decode())
data["peer"] = json.loads(data["peer"])
data["metadata"] = json.loads(data["metadata"])
self.assertEqual(path, "/lighthouse/webcache/redis1.int.local:6379")
self.assertEqual(
data,
{
"host": "redis1.int.local",
"ip": "10.0.1.8",
"port": 6379,
"metadata": {"type": "master"},
"peer": {
"port": 1024,
"name": "redis1.int.local",
"ip": "10.0.1.8"
}
}
)
@patch("lighthouse.peer.socket")
@patch("lighthouse.node.socket")
def test_report_up__no_node(self, mock_socket, peer_socket, mock_client):
mock_socket.getfqdn.return_value = "redis1.int.local"
mock_socket.gethostbyname.return_value = "10.0.1.8"
peer_socket.getfqdn.return_value = "redis1.int.local"
peer_socket.gethostbyname.return_value = "10.0.1.8"
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
zk.client.exists.return_value = None
service = Mock(metadata={})
service.name = "webcache"
zk.report_up(service, 6379)
self.assertEqual(zk.client.create.call_count, 1)
create_args, create_kwargs = zk.client.create.call_args
self.assertEqual(
create_args,
("/lighthouse/webcache/redis1.int.local:6379",)
)
self.assertEqual(len(create_kwargs), 3)
self.assertEqual(create_kwargs["makepath"], True)
self.assertEqual(create_kwargs["ephemeral"], True)
value = json.loads(create_kwargs["value"].decode())
value["peer"] = json.loads(value["peer"])
value["metadata"] = json.loads(value["metadata"])
self.assertEqual(
value,
{
"host": "redis1.int.local",
"ip": "10.0.1.8",
"port": 6379,
"metadata": {},
"peer": {
"port": 1024,
"name": "redis1.int.local",
"ip": "10.0.1.8",
}
}
)
@patch("lighthouse.peer.socket")
@patch("lighthouse.node.socket")
def test_report_up__old_node(self, mock_socket, peer_socket, mock_client):
mock_socket.getfqdn.return_value = "redis1.int.local"
mock_socket.gethostbyname.return_value = "10.0.1.8"
peer_socket.getfqdn.return_value = "redis1.int.local"
peer_socket.gethostbyname.return_value = "10.0.1.8"
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
znode = Mock(owner_session_id="0x1234")
zk.client.exists.return_value = znode
zk.client.client_id = ("0xasdf", "asf")
service = Mock(metadata={})
service.name = "webcache"
zk.report_up(service, 6379)
txn = zk.client.transaction.return_value
txn.delete.assert_called_once_with(
"/lighthouse/webcache/redis1.int.local:6379"
)
create_args, create_kwargs = txn.create.call_args
self.assertEqual(
create_args,
("/lighthouse/webcache/redis1.int.local:6379",)
)
self.assertEqual(len(create_kwargs), 2)
self.assertEqual(create_kwargs["ephemeral"], True)
value = json.loads(create_kwargs["value"].decode())
value["peer"] = json.loads(value["peer"])
value["metadata"] = json.loads(value["metadata"])
self.assertEqual(
value,
{
"host": "redis1.int.local",
"ip": "10.0.1.8",
"port": 6379,
"metadata": {},
"peer": {
"port": 1024,
"name": "redis1.int.local",
"ip": "10.0.1.8",
}
}
)
txn.commit.assert_called_once_with()
@patch("lighthouse.zookeeper.wait_on_any")
def test_report_down_waits_for_connection(self, wait_on_any, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
service = Mock(host="redis1")
service.name = "webcache"
zk.report_down(service, 6379)
args, _ = wait_on_any.call_args
self.assertIn(zk.connected, args)
@patch("lighthouse.node.socket")
def test_report_down(self, mock_socket, mock_client):
mock_socket.getfqdn.return_value = "pg01.int.local"
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
service = Mock()
service.name = "userdb"
zk.report_down(service, 5678)
zk.client.delete.assert_called_once_with(
"/lighthouse/userdb/pg01.int.local:5678"
)
def test_report_down_no_such_node(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.connect()
zk.connected.set()
zk.client.delete.side_effect = exceptions.NoNodeError
service = Mock(host="redis1")
service.name = "webcache"
zk.report_down(service, 6379)
def test_stop_watching(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
zk.watchers = {
"redis": Mock(),
"webapp": Mock()
}
cluster = Mock()
cluster.name = "riak"
zk.stop_watching(cluster)
self.assertEqual(
set(zk.watchers.keys()),
set(["redis", "webapp"])
)
def test_stop_watching_unknown_cluster(self, mock_client):
zk = ZookeeperDiscovery()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
cluster1 = Mock()
cluster1.name = "cluster1"
cluster2 = Mock()
cluster2.name = "cluster2"
zk.watched_clusters = set([cluster1])
zk.stop_watching(cluster2)
self.assertEqual(zk.watched_clusters, set([cluster1]))
@patch("lighthouse.zookeeper.wait_on_any")
def test_children_change_including_invalid_one(self,
wait_on_any,
mock_client):
zk = ZookeeperDiscovery()
zk.connect()
zk.connected.set()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
callback = Mock()
cluster = Mock()
cluster.name = "webapp"
child_payloads = [
[b"some invalid string ok"],
[json.dumps(
{"host": "app03", "ip": "10.0.1.8", "port": "8888"}
).encode()],
[json.dumps({
"host": "app04", "ip": "10.0.1.3", "port": "8888",
"peer": json.dumps(
{"name": "app04.int", "ip": "10.0.1.3", "port": 1024}
),
}).encode()],
]
def get_child_payload(*args):
return child_payloads.pop(0)
zk.client.get.side_effect = get_child_payload
def fire_immediately(watch):
watch(["app01:8888", "app03:8888", "app04:8888"])
zk.client.ChildrenWatch.return_value.side_effect = fire_immediately
zk.start_watching(cluster, callback)
wait_on_any.assert_called_once_with(zk.connected, zk.shutdown)
callback.assert_called_once_with()
self.assertEqual(len(cluster.nodes), 2)
self.assertEqual(cluster.nodes[0].host, "app03")
self.assertEqual(cluster.nodes[0].port, "8888")
self.assertEqual(cluster.nodes[1].host, "app04")
self.assertEqual(cluster.nodes[1].port, "8888")
self.assertEqual(cluster.nodes[1].peer.name, "app04.int")
self.assertEqual(cluster.nodes[1].peer.ip, "10.0.1.3")
self.assertEqual(cluster.nodes[1].peer.port, 1024)
@patch("lighthouse.zookeeper.wait_on_any")
def test_watch_no_node_at_first(self, wait_on_any, mock_client):
zk = ZookeeperDiscovery()
zk.connect()
zk.connected.set()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
node1 = Mock()
node2 = Mock()
cluster = Mock()
cluster.name = "webapp"
cluster.nodes = [node1, node2]
callback = Mock()
exists_results = [False, True]
def get_next_result(*args):
result = exists_results.pop(0)
if not exists_results:
zk.stop_events["/lighthouse/webapp"].set()
return result
zk.client.exists.side_effect = get_next_result
zk.start_watching(cluster, callback)
wait_on_any.assert_has_calls([
call(zk.stop_events["/lighthouse/webapp"], zk.shutdown, timeout=2)
])
@patch("lighthouse.zookeeper.wait_on_any")
def test_watch_connection_error(self, wait_on_any, mock_client):
zk = ZookeeperDiscovery()
zk.connect()
zk.connected.set()
zk.apply_config(
{"hosts": ["zk01.int", "zk02.int"], "path": "/lighthouse"}
)
node1 = Mock()
node2 = Mock()
cluster = Mock()
cluster.name = "webapp"
cluster.nodes = [node1, node2]
callback = Mock()
def mock_exists(*args):
zk.shutdown.set()
raise exceptions.ConnectionClosedError
zk.client.exists.side_effect = mock_exists
zk.start_watching(cluster, callback)
wait_on_any.assert_called_once_with(zk.connected, zk.shutdown)