def test_client(self):
c = MockClient(standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='a:1,b:2,c:3',
replicaSet='rs',
serverSelectionTimeoutMS=100,
connect=False)
self.addCleanup(c.close)
# C is brought up as a standalone.
c.mock_members.remove('c:3')
c.mock_standalones.append('c:3')
# Fail over.
c.kill_host('a:1')
c.kill_host('b:2')
with self.assertRaises(ServerSelectionTimeoutError):
c.db.command('ping')
self.assertEqual(c.address, None)
# Client can still discover the primary node
c.revive_host('a:1')
wait_until(lambda: c.address is not None, 'connect to primary')
self.assertEqual(c.address, ('a', 1))
def test_client(self):
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='a:1,b:2,c:3',
replicaSet='rs',
serverSelectionTimeoutMS=100)
self.addCleanup(c.close)
# MongoClient connects to primary by default.
wait_until(lambda: c.address is not None, 'connect to primary')
self.assertEqual(c.address, ('a', 1))
# C is brought up as a standalone.
c.mock_members.remove('c:3')
c.mock_standalones.append('c:3')
# Fail over.
c.kill_host('a:1')
c.kill_host('b:2')
# Force reconnect.
c.close()
with self.assertRaises(AutoReconnect):
c.db.command('ismaster')
self.assertEqual(c.address, None)
def test_discover_primary(self):
# Disable background refresh.
with client_knobs(heartbeat_frequency=999999):
c = MockClient(
standalones=[],
members=["a:1", "b:2", "c:3"],
mongoses=[],
host="b:2", # Pass a secondary.
replicaSet="rs",
)
wait_until(lambda: len(c.nodes) == 3, "connect")
self.assertEqual(c.address, ("a", 1))
# Fail over.
c.kill_host("a:1")
c.mock_primary = "b:2"
c.close()
self.assertEqual(0, len(c.nodes))
t = c._get_topology()
t.select_servers(writable_server_selector) # Reconnect.
self.assertEqual(c.address, ("b", 2))
# a:1 not longer in nodes.
self.assertLess(len(c.nodes), 3)
# c:3 is rediscovered.
t.select_server_by_address(("c", 3))
def test_discover_primary(self):
# Disable background refresh.
with client_knobs(heartbeat_frequency=999999):
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
wait_until(lambda: len(c.nodes) == 3, 'connect')
self.assertEqual(c.address, ('a', 1))
# Fail over.
c.kill_host('a:1')
c.mock_primary = 'b:2'
c.close()
self.assertEqual(0, len(c.nodes))
t = c._get_topology()
t.select_servers(writable_server_selector) # Reconnect.
self.assertEqual(c.address, ('b', 2))
# a:1 not longer in nodes.
self.assertLess(len(c.nodes), 3)
# c:3 is rediscovered.
t.select_server_by_address(('c', 3))
def test_discover_primary(self):
# Disable background refresh.
with client_knobs(heartbeat_frequency=999999):
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
wait_until(lambda: len(c.nodes) == 3, 'connect')
self.assertEqual(c.address, ('a', 1))
# Fail over.
c.kill_host('a:1')
c.mock_primary = 'b:2'
c.close()
self.assertEqual(0, len(c.nodes))
t = c._get_topology()
t.select_servers(writable_server_selector) # Reconnect.
self.assertEqual(c.address, ('b', 2))
# a:1 not longer in nodes.
self.assertLess(len(c.nodes), 3)
# c:3 is rediscovered.
t.select_server_by_address(('c', 3))
def test_acceptable_latency(self):
client = MockClient(
standalones=[],
members=[],
mongoses=['a:1', 'b:2', 'c:3'],
host='a:1,b:2,c:3',
secondaryAcceptableLatencyMS=7)
self.assertEqual(7, client.secondary_acceptable_latency_ms)
# No error
client.db.collection.find_one()
client = MockClient(
standalones=[],
members=[],
mongoses=['a:1', 'b:2', 'c:3'],
host='a:1,b:2,c:3',
secondaryAcceptableLatencyMS=0)
self.assertEqual(0, client.secondary_acceptable_latency_ms)
# No error
client.db.collection.find_one()
# Our chosen mongos goes down.
client.kill_host('%s:%s' % (client.host, client.port))
try:
client.db.collection.find_one()
except:
pass
# No error
client.db.collection.find_one()
def _test_network_error(self, operation_callback):
# Verify only the disconnected server is reset by a network failure.
# Disable background refresh.
with client_knobs(heartbeat_frequency=999999):
c = MockClient(
standalones=[], members=["a:1", "b:2"], mongoses=[], host="a:1", replicaSet="rs", connect=False
)
# Set host-specific information so we can test whether it is reset.
c.set_wire_version_range("a:1", 0, 1)
c.set_wire_version_range("b:2", 0, 2)
c._get_topology().select_servers(writable_server_selector)
wait_until(lambda: len(c.nodes) == 2, "connect")
c.kill_host("a:1")
# MongoClient is disconnected from the primary.
self.assertRaises(AutoReconnect, operation_callback, c)
# The primary's description is reset.
server_a = c._get_topology().get_server_by_address(("a", 1))
sd_a = server_a.description
self.assertEqual(SERVER_TYPE.Unknown, sd_a.server_type)
self.assertEqual(0, sd_a.min_wire_version)
self.assertEqual(0, sd_a.max_wire_version)
# ...but not the secondary's.
server_b = c._get_topology().get_server_by_address(("b", 2))
sd_b = server_b.description
self.assertEqual(SERVER_TYPE.RSSecondary, sd_b.server_type)
self.assertEqual(0, sd_b.min_wire_version)
self.assertEqual(2, sd_b.max_wire_version)
def test_client(self):
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='a:1,b:2,c:3',
replicaSet='rs')
# MongoClient connects to primary by default.
self.assertEqual('a', c.host)
self.assertEqual(1, c.port)
# C is brought up as a standalone.
c.mock_members.remove('c:3')
c.mock_standalones.append('c:3')
# Fail over.
c.kill_host('a:1')
c.kill_host('b:2')
# Force reconnect.
c.disconnect()
try:
c.db.collection.find_one()
except ConfigurationError, e:
self.assertTrue('not a member of replica set' in str(e))
def test_client(self):
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='a:1,b:2,c:3',
replicaSet='rs',
serverSelectionTimeoutMS=100)
# MongoClient connects to primary by default.
wait_until(lambda: c.address is not None, 'connect to primary')
self.assertEqual(c.address, ('a', 1))
# C is brought up as a standalone.
c.mock_members.remove('c:3')
c.mock_standalones.append('c:3')
# Fail over.
c.kill_host('a:1')
c.kill_host('b:2')
# Force reconnect.
c.close()
with self.assertRaises(AutoReconnect):
c.db.command('ismaster')
self.assertEqual(c.address, None)
def test_failover(self):
nthreads = 1
# ['1:1', '2:2', '3:3', ...]
mock_hosts = ['%d:%d' % (i, i) for i in range(50)]
client = MockClient(
standalones=[],
members=[],
mongoses=mock_hosts,
host=','.join(mock_hosts))
self.assertEqual(len(mock_hosts), len(client.nodes))
# Our chosen mongos goes down.
client.kill_host('%s:%s' % (client.host, client.port))
# Trigger failover. AutoReconnect should be raised exactly once.
errors = []
passed = []
def f():
try:
client.db.collection.find_one()
except AutoReconnect:
errors.append(True)
# Second attempt succeeds.
client.db.collection.find_one()
passed.append(True)
threads = [threading.Thread(target=f) for _ in range(nthreads)]
for t in threads:
t.start()
for t in threads:
t.join()
self.assertEqual(1, len(errors))
self.assertEqual(nthreads, len(passed))
# Down host is still in list.
self.assertEqual(len(mock_hosts), len(client.nodes))
def test_failover(self):
nthreads = 1
# ['1:1', '2:2', '3:3', ...]
mock_hosts = ['%d:%d' % (i, i) for i in range(50)]
client = MockClient(
standalones=[],
members=[],
mongoses=mock_hosts,
host=','.join(mock_hosts))
self.assertEqual(len(mock_hosts), len(client.nodes))
# Our chosen mongos goes down.
client.kill_host('%s:%s' % (client.host, client.port))
# Trigger failover. AutoReconnect should be raised exactly once.
errors = []
passed = []
def f():
try:
client.db.collection.find_one()
except AutoReconnect:
errors.append(True)
# Second attempt succeeds.
client.db.collection.find_one()
passed.append(True)
threads = [threading.Thread(target=f) for _ in range(nthreads)]
for t in threads:
t.start()
for t in threads:
t.join()
self.assertEqual(1, len(errors))
self.assertEqual(nthreads, len(passed))
# Down host is still in list.
self.assertEqual(len(mock_hosts), len(client.nodes))
def test_backport_localthresholdms_kwarg(self):
# Test that localThresholdMS takes precedence over
# secondaryAcceptableLatencyMS.
ctx = catch_warnings()
try:
warnings.simplefilter("ignore", DeprecationWarning)
client = MockClient(
standalones=[],
members=[],
mongoses=['a:1', 'b:2', 'c:3'],
host='a:1,b:2,c:3',
localThresholdMS=7,
secondaryAcceptableLatencyMS=0)
self.assertEqual(7, client.secondary_acceptable_latency_ms)
self.assertEqual(7, client.local_threshold_ms)
# No error
client.db.collection.find_one()
client = MockClient(
standalones=[],
members=[],
mongoses=['a:1', 'b:2', 'c:3'],
host='a:1,b:2,c:3',
localThresholdMS=0,
secondaryAcceptableLatencyMS=15)
self.assertEqual(0, client.secondary_acceptable_latency_ms)
self.assertEqual(0, client.local_threshold_ms)
# Test that using localThresholdMS works in the same way as using
# secondaryAcceptableLatencyMS.
client.db.collection.find_one()
# Our chosen mongos goes down.
client.kill_host('%s:%s' % client.address)
try:
client.db.collection.find_one()
except:
pass
# No error
client.db.collection.find_one()
finally:
ctx.exit()
def test_reconnect(self):
# Verify the node list isn't forgotten during a network failure.
c = MockClient(
standalones=[], members=["a:1", "b:2", "c:3"], mongoses=[], host="b:2", replicaSet="rs" # Pass a secondary.
)
wait_until(lambda: len(c.nodes) == 3, "connect")
# Total failure.
c.kill_host("a:1")
c.kill_host("b:2")
c.kill_host("c:3")
# MongoClient discovers it's alone.
self.assertRaises(AutoReconnect, c.db.collection.find_one)
# But it can reconnect.
c.revive_host("a:1")
c._get_topology().select_servers(writable_server_selector)
self.assertEqual(c.address, ("a", 1))
def test_discover_primary(self):
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
self.assertEqual(('a', 1), c.address)
self.assertEqual(3, len(c.nodes))
# Fail over.
c.kill_host('a:1')
c.mock_primary = 'b:2'
# Force reconnect.
c.close()
c.db.collection.find_one()
self.assertEqual(('b', 2), c.address)
# a:1 is still in nodes.
self.assertEqual(3, len(c.nodes))
def test_reconnect(self):
# Verify the node list isn't forgotten during a network failure.
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
wait_until(lambda: len(c.nodes) == 3, 'connect')
# Total failure.
c.kill_host('a:1')
c.kill_host('b:2')
c.kill_host('c:3')
# MongoClient discovers it's alone.
self.assertRaises(AutoReconnect, c.db.collection.find_one)
# But it can reconnect.
c.revive_host('a:1')
c._get_topology().select_servers(writable_server_selector)
self.assertEqual(c.address, ('a', 1))
def test_reconnect(self):
# Verify the node list isn't forgotten during a network failure.
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
wait_until(lambda: len(c.nodes) == 3, 'connect')
# Total failure.
c.kill_host('a:1')
c.kill_host('b:2')
c.kill_host('c:3')
# MongoClient discovers it's alone.
self.assertRaises(AutoReconnect, c.db.collection.find_one)
# But it can reconnect.
c.revive_host('a:1')
c._get_topology().select_servers(writable_server_selector)
self.assertEqual(c.address, ('a', 1))
def test_reconnect(self):
# Verify the node list isn't forgotten during a network failure.
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
# Total failure.
c.kill_host('a:1')
c.kill_host('b:2')
c.kill_host('c:3')
# MongoClient discovers it's alone.
self.assertRaises(AutoReconnect, c.db.collection.find_one)
# But it remembers its node list.
self.assertEqual(3, len(c.nodes))
# So it can reconnect.
c.revive_host('a:1')
c.db.collection.find_one()
def test_reconnect(self):
# Verify the node list isn't forgotten during a network failure.
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
# Total failure.
c.kill_host('a:1')
c.kill_host('b:2')
c.kill_host('c:3')
# MongoClient discovers it's alone.
self.assertRaises(AutoReconnect, c.db.collection.find_one)
# But it remembers its node list.
self.assertEqual(3, len(c.nodes))
# So it can reconnect.
c.revive_host('a:1')
c.db.collection.find_one()
def _test_network_error(self, operation_callback):
# Verify only the disconnected server is reset by a network failure.
# Disable background refresh.
with client_knobs(heartbeat_frequency=999999):
c = MockClient(
standalones=[],
members=['a:1', 'b:2'],
mongoses=[],
host='a:1',
replicaSet='rs',
connect=False)
# Set host-specific information so we can test whether it is reset.
c.set_wire_version_range('a:1', 0, 1)
c.set_wire_version_range('b:2', 0, 2)
c._get_topology().select_servers(writable_server_selector)
wait_until(lambda: len(c.nodes) == 2, 'connect')
c.kill_host('a:1')
# MongoClient is disconnected from the primary.
self.assertRaises(AutoReconnect, operation_callback, c)
# The primary's description is reset.
server_a = c._get_topology().get_server_by_address(('a', 1))
sd_a = server_a.description
self.assertEqual(SERVER_TYPE.Unknown, sd_a.server_type)
self.assertEqual(0, sd_a.min_wire_version)
self.assertEqual(0, sd_a.max_wire_version)
# ...but not the secondary's.
server_b = c._get_topology().get_server_by_address(('b', 2))
sd_b = server_b.description
self.assertEqual(SERVER_TYPE.RSSecondary, sd_b.server_type)
self.assertEqual(0, sd_b.min_wire_version)
self.assertEqual(2, sd_b.max_wire_version)
def test_discover_primary(self):
c = MockClient(
standalones=[],
members=['a:1', 'b:2', 'c:3'],
mongoses=[],
host='b:2', # Pass a secondary.
replicaSet='rs')
self.assertEqual('a', c.host)
self.assertEqual(1, c.port)
self.assertEqual(3, len(c.nodes))
# Fail over.
c.kill_host('a:1')
c.mock_primary = 'b:2'
# Force reconnect.
c.disconnect()
c.db.collection.find_one()
self.assertEqual('b', c.host)
self.assertEqual(2, c.port)
# a:1 is still in nodes.
self.assertEqual(3, len(c.nodes))