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test_server_selection.py
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# Copyright 2015 MongoDB, Inc.
#
# Licensed 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.
"""Test the topology module."""
import json
import os
import sys
sys.path[0:0] = [""]
from pymongo import read_preferences
from pymongo.common import clean_node
from pymongo.errors import AutoReconnect
from pymongo.ismaster import IsMaster
from pymongo.server_description import ServerDescription
from pymongo.settings import TopologySettings
from pymongo.server_selectors import writable_server_selector
from pymongo.topology import Topology
from test import unittest
# Location of JSON test specifications.
_TEST_PATH = os.path.join(
os.path.dirname(os.path.realpath(__file__)),
os.path.join('server_selection', 'server_selection'))
class MockSocketInfo(object):
def close(self):
pass
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
pass
class MockPool(object):
def __init__(self, *args, **kwargs):
pass
def reset(self):
pass
def remove_stale_sockets(self):
pass
class MockMonitor(object):
def __init__(self, server_description, topology, pool, topology_settings):
pass
def open(self):
pass
def request_check(self):
pass
def close(self):
pass
def get_addresses(server_list):
seeds = []
hosts = []
for server in server_list:
seeds.append(clean_node(server['address']))
hosts.append(server['address'])
return seeds, hosts
def make_server_description(server, hosts):
"""Make ServerDescription from server info from JSON file."""
ismaster_response = {}
ismaster_response['tags'] = server['tags']
ismaster_response['ok'] = True
ismaster_response['hosts'] = hosts
server_type = server['type']
if server_type != "Standalone" and server_type != "Mongos":
ismaster_response['setName'] = True
if server_type == "RSPrimary":
ismaster_response['ismaster'] = True
elif server_type == "RSSecondary":
ismaster_response['secondary'] = True
elif server_type == "Mongos":
ismaster_response['msg'] = 'isdbgrid'
return ServerDescription(clean_node(server['address']),
IsMaster(ismaster_response),
round_trip_time=server['avg_rtt_ms'])
class TestAllScenarios(unittest.TestCase):
pass
def create_test(scenario_def):
def run_scenario(self):
# Initialize topologies.
seeds, hosts = get_addresses(
scenario_def['topology_description']['servers'])
# "Eligible servers" is defined in the server selection spec as
# the set of servers matching both the ReadPreference's mode
# and tag sets.
top_latency = Topology(
TopologySettings(seeds=seeds, monitor_class=MockMonitor,
pool_class=MockPool))
# "In latency window" is defined in the server selection
# spec as the subset of suitable_servers that falls within the
# allowable latency window.
top_suitable = Topology(
TopologySettings(seeds=seeds, local_threshold_ms=1000000,
monitor_class=MockMonitor,
pool_class=MockPool))
# Update topologies with server descriptions.
for server in scenario_def['topology_description']['servers']:
server_description = make_server_description(server, hosts)
top_suitable.on_change(server_description)
top_latency.on_change(server_description)
# Create server selector.
if scenario_def["operation"] == "write":
instance = writable_server_selector
else:
# Make first letter lowercase to match read_pref's modes.
mode_string = scenario_def['read_preference']['mode']
if mode_string:
mode_string = mode_string[:1].lower() + mode_string[1:]
mode = read_preferences.read_pref_mode_from_name(mode_string)
tag_sets = None
if scenario_def['read_preference']['tag_sets'][0]:
tag_sets = scenario_def['read_preference']['tag_sets']
instance = read_preferences.make_read_preference(mode, tag_sets)
# Select servers.
if not scenario_def['suitable_servers']:
self.assertRaises(AutoReconnect, top_suitable.select_server,
instance,
server_selection_timeout=0)
return
if not scenario_def['in_latency_window']:
self.assertRaises(AutoReconnect, top_latency.select_server,
instance,
server_selection_timeout=0)
return
actual_suitable_s = top_suitable.select_servers(instance,
server_selection_timeout=0)
actual_latency_s = top_latency.select_servers(instance,
server_selection_timeout=0)
expected_suitable_servers = {}
for server in scenario_def['suitable_servers']:
server_description = make_server_description(server, hosts)
expected_suitable_servers[server['address']] = server_description
actual_suitable_servers = {}
for s in actual_suitable_s:
actual_suitable_servers["%s:%d" % (s.description.address[0],
s.description.address[1])] = s.description
self.assertEqual(len(actual_suitable_servers),
len(expected_suitable_servers))
for k, actual in actual_suitable_servers.items():
expected = expected_suitable_servers[k]
self.assertEqual(expected.address, actual.address)
self.assertEqual(expected.server_type, actual.server_type)
self.assertEqual(expected.round_trip_time, actual.round_trip_time)
self.assertEqual(expected.tags, actual.tags)
self.assertEqual(expected.all_hosts, actual.all_hosts)
expected_latency_servers = {}
for server in scenario_def['in_latency_window']:
server_description = make_server_description(server, hosts)
expected_latency_servers[server['address']] = server_description
actual_latency_servers = {}
for s in actual_latency_s:
actual_latency_servers["%s:%d" %
(s.description.address[0],
s.description.address[1])] = s.description
self.assertEqual(len(actual_latency_servers),
len(expected_latency_servers))
for k, actual in actual_latency_servers.items():
expected = expected_latency_servers[k]
self.assertEqual(expected.address, actual.address)
self.assertEqual(expected.server_type, actual.server_type)
self.assertEqual(expected.round_trip_time, actual.round_trip_time)
self.assertEqual(expected.tags, actual.tags)
self.assertEqual(expected.all_hosts, actual.all_hosts)
return run_scenario
def create_tests():
for dirpath, _, filenames in os.walk(_TEST_PATH):
dirname = os.path.split(dirpath)
dirname = os.path.split(dirname[-2])[-1] + '_' + dirname[-1]
for filename in filenames:
with open(os.path.join(dirpath, filename)) as scenario_stream:
scenario_def = json.load(scenario_stream)
# Construct test from scenario.
new_test = create_test(scenario_def)
test_name = 'test_%s_%s' % (
dirname, os.path.splitext(filename)[0])
new_test.__name__ = test_name
setattr(TestAllScenarios, new_test.__name__, new_test)
create_tests()
if __name__ == "__main__":
unittest.main()