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from __future__ import with_statement
import pytest
from redis import exceptions
from redis.sentinel import (Sentinel, SentinelConnectionPool,
MasterNotFoundError, SlaveNotFoundError)
from redis._compat import next
import redis.sentinel
class SentinelTestClient(object):
def __init__(self, cluster, id):
self.cluster = cluster
self.id = id
def sentinel_masters(self):
self.cluster.connection_error_if_down(self)
return {self.cluster.service_name: self.cluster.master}
def sentinel_slaves(self, master_name):
self.cluster.connection_error_if_down(self)
if master_name != self.cluster.service_name:
return []
return self.cluster.slaves
class SentinelTestCluster(object):
def __init__(self, service_name='mymaster', ip='127.0.0.1', port=6379):
self.clients = {}
self.master = {
'ip': ip,
'port': port,
'is_master': True,
'is_sdown': False,
'is_odown': False,
'num-other-sentinels': 0,
}
self.service_name = service_name
self.slaves = []
self.nodes_down = set()
def connection_error_if_down(self, node):
if node.id in self.nodes_down:
raise exceptions.ConnectionError
def client(self, host, port, **kwargs):
return SentinelTestClient(self, (host, port))
@pytest.fixture()
def cluster(request):
def teardown():
redis.sentinel.StrictRedis = saved_StrictRedis
cluster = SentinelTestCluster()
saved_StrictRedis = redis.sentinel.StrictRedis
redis.sentinel.StrictRedis = cluster.client
request.addfinalizer(teardown)
return cluster
@pytest.fixture()
def sentinel(request, cluster):
return Sentinel([('foo', 26379), ('bar', 26379)])
def test_discover_master(sentinel):
address = sentinel.discover_master('mymaster')
assert address == ('127.0.0.1', 6379)
def test_discover_master_error(sentinel):
with pytest.raises(MasterNotFoundError):
sentinel.discover_master('xxx')
def test_discover_master_sentinel_down(cluster, sentinel):
# Put first sentinel 'foo' down
cluster.nodes_down.add(('foo', 26379))
address = sentinel.discover_master('mymaster')
assert address == ('127.0.0.1', 6379)
# 'bar' is now first sentinel
assert sentinel.sentinels[0].id == ('bar', 26379)
def test_master_min_other_sentinels(cluster):
sentinel = Sentinel([('foo', 26379)], min_other_sentinels=1)
# min_other_sentinels
with pytest.raises(MasterNotFoundError):
sentinel.discover_master('mymaster')
cluster.master['num-other-sentinels'] = 2
address = sentinel.discover_master('mymaster')
assert address == ('127.0.0.1', 6379)
def test_master_odown(cluster, sentinel):
cluster.master['is_odown'] = True
with pytest.raises(MasterNotFoundError):
sentinel.discover_master('mymaster')
def test_master_sdown(cluster, sentinel):
cluster.master['is_sdown'] = True
with pytest.raises(MasterNotFoundError):
sentinel.discover_master('mymaster')
def test_discover_slaves(cluster, sentinel):
assert sentinel.discover_slaves('mymaster') == []
cluster.slaves = [
{'ip': 'slave0', 'port': 1234, 'is_odown': False, 'is_sdown': False},
{'ip': 'slave1', 'port': 1234, 'is_odown': False, 'is_sdown': False},
]
assert sentinel.discover_slaves('mymaster') == [
('slave0', 1234), ('slave1', 1234)]
# slave0 -> ODOWN
cluster.slaves[0]['is_odown'] = True
assert sentinel.discover_slaves('mymaster') == [
('slave1', 1234)]
# slave1 -> SDOWN
cluster.slaves[1]['is_sdown'] = True
assert sentinel.discover_slaves('mymaster') == []
cluster.slaves[0]['is_odown'] = False
cluster.slaves[1]['is_sdown'] = False
# node0 -> DOWN
cluster.nodes_down.add(('foo', 26379))
assert sentinel.discover_slaves('mymaster') == [
('slave0', 1234), ('slave1', 1234)]
def test_master_for(cluster, sentinel):
master = sentinel.master_for('mymaster', db=9)
assert master.ping()
assert master.connection_pool.master_address == ('127.0.0.1', 6379)
# Use internal connection check
master = sentinel.master_for('mymaster', db=9, check_connection=True)
assert master.ping()
def test_slave_for(cluster, sentinel):
cluster.slaves = [
{'ip': '127.0.0.1', 'port': 6379,
'is_odown': False, 'is_sdown': False},
]
slave = sentinel.slave_for('mymaster', db=9)
assert slave.ping()
def test_slave_for_slave_not_found_error(cluster, sentinel):
cluster.master['is_odown'] = True
slave = sentinel.slave_for('mymaster', db=9)
with pytest.raises(SlaveNotFoundError):
slave.ping()
def test_slave_round_robin(cluster, sentinel):
cluster.slaves = [
{'ip': 'slave0', 'port': 6379, 'is_odown': False, 'is_sdown': False},
{'ip': 'slave1', 'port': 6379, 'is_odown': False, 'is_sdown': False},
]
pool = SentinelConnectionPool('mymaster', sentinel)
rotator = pool.rotate_slaves()
assert next(rotator) in (('slave0', 6379), ('slave1', 6379))
assert next(rotator) in (('slave0', 6379), ('slave1', 6379))
# Fallback to master
assert next(rotator) == ('127.0.0.1', 6379)
with pytest.raises(SlaveNotFoundError):
next(rotator)
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