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cpython/Lib/bsddb/test/test_replication.py

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"""TestCases for distributed transactions.
"""
import os
import time
import unittest
from test_all import db, test_support, have_threads, verbose, \
get_new_environment_path, get_new_database_path
#----------------------------------------------------------------------
class DBReplication(unittest.TestCase) :
import sys
if sys.version_info < (2, 4) :
def assertTrue(self, expr, msg=None):
self.failUnless(expr,msg=msg)
def setUp(self) :
self.homeDirMaster = get_new_environment_path()
self.homeDirClient = get_new_environment_path()
self.dbenvMaster = db.DBEnv()
self.dbenvClient = db.DBEnv()
# Must use "DB_THREAD" because the Replication Manager will
# be executed in other threads but will use the same environment.
# http://forums.oracle.com/forums/thread.jspa?threadID=645788&tstart=0
self.dbenvMaster.open(self.homeDirMaster, db.DB_CREATE | db.DB_INIT_TXN
| db.DB_INIT_LOG | db.DB_INIT_MPOOL | db.DB_INIT_LOCK |
db.DB_INIT_REP | db.DB_RECOVER | db.DB_THREAD, 0666)
self.dbenvClient.open(self.homeDirClient, db.DB_CREATE | db.DB_INIT_TXN
| db.DB_INIT_LOG | db.DB_INIT_MPOOL | db.DB_INIT_LOCK |
db.DB_INIT_REP | db.DB_RECOVER | db.DB_THREAD, 0666)
self.confirmed_master=self.client_startupdone=False
def confirmed_master(a,b,c) :
if b==db.DB_EVENT_REP_MASTER :
self.confirmed_master=True
def client_startupdone(a,b,c) :
if b==db.DB_EVENT_REP_STARTUPDONE :
self.client_startupdone=True
self.dbenvMaster.set_event_notify(confirmed_master)
self.dbenvClient.set_event_notify(client_startupdone)
#self.dbenvMaster.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvMaster.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
#self.dbenvClient.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvClient.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
self.dbMaster = self.dbClient = None
def tearDown(self):
if self.dbClient :
self.dbClient.close()
if self.dbMaster :
self.dbMaster.close()
# Here we assign dummy event handlers to allow GC of the test object.
# Since the dummy handler doesn't use any outer scope variable, it
# doesn't keep any reference to the test object.
def dummy(*args) :
pass
self.dbenvMaster.set_event_notify(dummy)
self.dbenvClient.set_event_notify(dummy)
self.dbenvClient.close()
self.dbenvMaster.close()
test_support.rmtree(self.homeDirClient)
test_support.rmtree(self.homeDirMaster)
class DBReplicationManager(DBReplication) :
def test01_basic_replication(self) :
master_port = test_support.find_unused_port()
self.dbenvMaster.repmgr_set_local_site("127.0.0.1", master_port)
client_port = test_support.find_unused_port()
self.dbenvClient.repmgr_set_local_site("127.0.0.1", client_port)
self.dbenvMaster.repmgr_add_remote_site("127.0.0.1", client_port)
self.dbenvClient.repmgr_add_remote_site("127.0.0.1", master_port)
self.dbenvMaster.rep_set_nsites(2)
self.dbenvClient.rep_set_nsites(2)
self.dbenvMaster.rep_set_priority(10)
self.dbenvClient.rep_set_priority(0)
self.dbenvMaster.rep_set_timeout(db.DB_REP_CONNECTION_RETRY,100123)
self.dbenvClient.rep_set_timeout(db.DB_REP_CONNECTION_RETRY,100321)
self.assertEquals(self.dbenvMaster.rep_get_timeout(
db.DB_REP_CONNECTION_RETRY), 100123)
self.assertEquals(self.dbenvClient.rep_get_timeout(
db.DB_REP_CONNECTION_RETRY), 100321)
self.dbenvMaster.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 100234)
self.dbenvClient.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 100432)
self.assertEquals(self.dbenvMaster.rep_get_timeout(
db.DB_REP_ELECTION_TIMEOUT), 100234)
self.assertEquals(self.dbenvClient.rep_get_timeout(
db.DB_REP_ELECTION_TIMEOUT), 100432)
self.dbenvMaster.rep_set_timeout(db.DB_REP_ELECTION_RETRY, 100345)
self.dbenvClient.rep_set_timeout(db.DB_REP_ELECTION_RETRY, 100543)
self.assertEquals(self.dbenvMaster.rep_get_timeout(
db.DB_REP_ELECTION_RETRY), 100345)
self.assertEquals(self.dbenvClient.rep_get_timeout(
db.DB_REP_ELECTION_RETRY), 100543)
self.dbenvMaster.repmgr_set_ack_policy(db.DB_REPMGR_ACKS_ALL)
self.dbenvClient.repmgr_set_ack_policy(db.DB_REPMGR_ACKS_ALL)
self.dbenvMaster.repmgr_start(1, db.DB_REP_MASTER);
self.dbenvClient.repmgr_start(1, db.DB_REP_CLIENT);
self.assertEquals(self.dbenvMaster.rep_get_nsites(),2)
self.assertEquals(self.dbenvClient.rep_get_nsites(),2)
self.assertEquals(self.dbenvMaster.rep_get_priority(),10)
self.assertEquals(self.dbenvClient.rep_get_priority(),0)
self.assertEquals(self.dbenvMaster.repmgr_get_ack_policy(),
db.DB_REPMGR_ACKS_ALL)
self.assertEquals(self.dbenvClient.repmgr_get_ack_policy(),
db.DB_REPMGR_ACKS_ALL)
# The timeout is necessary in BDB 4.5, since DB_EVENT_REP_STARTUPDONE
# is not generated if the master has no new transactions.
# This is solved in BDB 4.6 (#15542).
import time
timeout = time.time()+60
while (time.time()<timeout) and not (self.confirmed_master and self.client_startupdone) :
time.sleep(0.02)
# self.client_startupdone does not always get set to True within
# the timeout. On windows this may be a deep issue, on other
# platforms it is likely just a timing issue, especially on slow
# virthost buildbots (see issue 3892 for more). Even though
# the timeout triggers, the rest of this test method usually passes
# (but not all of it always, see below). So we just note the
# timeout on stderr and keep soldering on.
if time.time()>timeout:
import sys
print >> sys.stderr, ("XXX: timeout happened before"
"startup was confirmed - see issue 3892")
startup_timeout = True
d = self.dbenvMaster.repmgr_site_list()
self.assertEquals(len(d), 1)
self.assertEquals(d[0][0], "127.0.0.1")
self.assertEquals(d[0][1], client_port)
self.assertTrue((d[0][2]==db.DB_REPMGR_CONNECTED) or \
(d[0][2]==db.DB_REPMGR_DISCONNECTED))
d = self.dbenvClient.repmgr_site_list()
self.assertEquals(len(d), 1)
self.assertEquals(d[0][0], "127.0.0.1")
self.assertEquals(d[0][1], master_port)
self.assertTrue((d[0][2]==db.DB_REPMGR_CONNECTED) or \
(d[0][2]==db.DB_REPMGR_DISCONNECTED))
if db.version() >= (4,6) :
d = self.dbenvMaster.repmgr_stat(flags=db.DB_STAT_CLEAR);
self.assertTrue("msgs_queued" in d)
self.dbMaster=db.DB(self.dbenvMaster)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.open("test", db.DB_HASH, db.DB_CREATE, 0666, txn=txn)
txn.commit()
import time,os.path
timeout=time.time()+10
while (time.time()<timeout) and \
not (os.path.exists(os.path.join(self.homeDirClient,"test"))) :
time.sleep(0.01)
self.dbClient=db.DB(self.dbenvClient)
while True :
txn=self.dbenvClient.txn_begin()
try :
self.dbClient.open("test", db.DB_HASH, flags=db.DB_RDONLY,
mode=0666, txn=txn)
except db.DBRepHandleDeadError :
txn.abort()
self.dbClient.close()
self.dbClient=db.DB(self.dbenvClient)
continue
txn.commit()
break
txn=self.dbenvMaster.txn_begin()
self.dbMaster.put("ABC", "123", txn=txn)
txn.commit()
import time
timeout=time.time()+10
v=None
while (time.time()<timeout) and (v is None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
# If startup did not happen before the timeout above, then this test
# sometimes fails. This happens randomly, which causes buildbot
# instability, but all the other bsddb tests pass. Since bsddb3 in the
# stdlib is currently not getting active maintenance, and is gone in
# py3k, we just skip the end of the test in that case.
if time.time()>=timeout and startup_timeout:
self.skipTest("replication test skipped due to random failure, "
"see issue 3892")
self.assertTrue(time.time()<timeout)
self.assertEquals("123", v)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.delete("ABC", txn=txn)
txn.commit()
timeout=time.time()+10
while (time.time()<timeout) and (v is not None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.assertEquals(None, v)
class DBBaseReplication(DBReplication) :
def setUp(self) :
DBReplication.setUp(self)
def confirmed_master(a,b,c) :
if (b == db.DB_EVENT_REP_MASTER) or (b == db.DB_EVENT_REP_ELECTED) :
self.confirmed_master = True
def client_startupdone(a,b,c) :
if b == db.DB_EVENT_REP_STARTUPDONE :
self.client_startupdone = True
self.dbenvMaster.set_event_notify(confirmed_master)
self.dbenvClient.set_event_notify(client_startupdone)
import Queue
self.m2c = Queue.Queue()
self.c2m = Queue.Queue()
# There are only two nodes, so we don't need to
# do any routing decision
def m2c(dbenv, control, rec, lsnp, envid, flags) :
self.m2c.put((control, rec))
def c2m(dbenv, control, rec, lsnp, envid, flags) :
self.c2m.put((control, rec))
self.dbenvMaster.rep_set_transport(13,m2c)
self.dbenvMaster.rep_set_priority(10)
self.dbenvClient.rep_set_transport(3,c2m)
self.dbenvClient.rep_set_priority(0)
self.assertEquals(self.dbenvMaster.rep_get_priority(),10)
self.assertEquals(self.dbenvClient.rep_get_priority(),0)
#self.dbenvMaster.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvMaster.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
#self.dbenvClient.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvClient.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
def thread_master() :
return self.thread_do(self.dbenvMaster, self.c2m, 3,
self.master_doing_election, True)
def thread_client() :
return self.thread_do(self.dbenvClient, self.m2c, 13,
self.client_doing_election, False)
from threading import Thread
t_m=Thread(target=thread_master)
t_c=Thread(target=thread_client)
import sys
if sys.version_info[0] < 3 :
t_m.setDaemon(True)
t_c.setDaemon(True)
else :
t_m.daemon = True
t_c.daemon = True
self.t_m = t_m
self.t_c = t_c
self.dbMaster = self.dbClient = None
self.master_doing_election=[False]
self.client_doing_election=[False]
def tearDown(self):
if self.dbClient :
self.dbClient.close()
if self.dbMaster :
self.dbMaster.close()
self.m2c.put(None)
self.c2m.put(None)
self.t_m.join()
self.t_c.join()
# Here we assign dummy event handlers to allow GC of the test object.
# Since the dummy handler doesn't use any outer scope variable, it
# doesn't keep any reference to the test object.
def dummy(*args) :
pass
self.dbenvMaster.set_event_notify(dummy)
self.dbenvClient.set_event_notify(dummy)
self.dbenvMaster.rep_set_transport(13,dummy)
self.dbenvClient.rep_set_transport(3,dummy)
self.dbenvClient.close()
self.dbenvMaster.close()
test_support.rmtree(self.homeDirClient)
test_support.rmtree(self.homeDirMaster)
def basic_rep_threading(self) :
self.dbenvMaster.rep_start(flags=db.DB_REP_MASTER)
self.dbenvClient.rep_start(flags=db.DB_REP_CLIENT)
def thread_do(env, q, envid, election_status, must_be_master) :
while True :
v=q.get()
if v is None : return
env.rep_process_message(v[0], v[1], envid)
self.thread_do = thread_do
self.t_m.start()
self.t_c.start()
def test01_basic_replication(self) :
self.basic_rep_threading()
# The timeout is necessary in BDB 4.5, since DB_EVENT_REP_STARTUPDONE
# is not generated if the master has no new transactions.
# This is solved in BDB 4.6 (#15542).
import time
timeout = time.time()+60
while (time.time()<timeout) and not (self.confirmed_master and
self.client_startupdone) :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.dbMaster=db.DB(self.dbenvMaster)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.open("test", db.DB_HASH, db.DB_CREATE, 0666, txn=txn)
txn.commit()
import time,os.path
timeout=time.time()+10
while (time.time()<timeout) and \
not (os.path.exists(os.path.join(self.homeDirClient,"test"))) :
time.sleep(0.01)
self.dbClient=db.DB(self.dbenvClient)
while True :
txn=self.dbenvClient.txn_begin()
try :
self.dbClient.open("test", db.DB_HASH, flags=db.DB_RDONLY,
mode=0666, txn=txn)
except db.DBRepHandleDeadError :
txn.abort()
self.dbClient.close()
self.dbClient=db.DB(self.dbenvClient)
continue
txn.commit()
break
d = self.dbenvMaster.rep_stat(flags=db.DB_STAT_CLEAR);
self.assertTrue("master_changes" in d)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.put("ABC", "123", txn=txn)
txn.commit()
import time
timeout=time.time()+10
v=None
while (time.time()<timeout) and (v is None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.assertEquals("123", v)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.delete("ABC", txn=txn)
txn.commit()
timeout=time.time()+10
while (time.time()<timeout) and (v is not None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.assertEquals(None, v)
if db.version() >= (4,7) :
def test02_test_request(self) :
self.basic_rep_threading()
(minimum, maximum) = self.dbenvClient.rep_get_request()
self.dbenvClient.rep_set_request(minimum-1, maximum+1)
self.assertEqual(self.dbenvClient.rep_get_request(),
(minimum-1, maximum+1))
if db.version() >= (4,6) :
def test03_master_election(self) :
# Get ready to hold an election
#self.dbenvMaster.rep_start(flags=db.DB_REP_MASTER)
self.dbenvMaster.rep_start(flags=db.DB_REP_CLIENT)
self.dbenvClient.rep_start(flags=db.DB_REP_CLIENT)
def thread_do(env, q, envid, election_status, must_be_master) :
while True :
v=q.get()
if v is None : return
r = env.rep_process_message(v[0],v[1],envid)
if must_be_master and self.confirmed_master :
self.dbenvMaster.rep_start(flags = db.DB_REP_MASTER)
must_be_master = False
if r[0] == db.DB_REP_HOLDELECTION :
def elect() :
while True :
try :
env.rep_elect(2, 1)
election_status[0] = False
break
except db.DBRepUnavailError :
pass
if not election_status[0] and not self.confirmed_master :
from threading import Thread
election_status[0] = True
t=Thread(target=elect)
import sys
if sys.version_info[0] < 3 :
t.setDaemon(True)
else :
t.daemon = True
t.start()
self.thread_do = thread_do
self.t_m.start()
self.t_c.start()
self.dbenvMaster.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 50000)
self.dbenvClient.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 50000)
self.client_doing_election[0] = True
while True :
try :
self.dbenvClient.rep_elect(2, 1)
self.client_doing_election[0] = False
break
except db.DBRepUnavailError :
pass
self.assertTrue(self.confirmed_master)
if db.version() >= (4,7) :
def test04_test_clockskew(self) :
fast, slow = 1234, 1230
self.dbenvMaster.rep_set_clockskew(fast, slow)
self.assertEqual((fast, slow),
self.dbenvMaster.rep_get_clockskew())
self.basic_rep_threading()
#----------------------------------------------------------------------
def test_suite():
suite = unittest.TestSuite()
if db.version() >= (4, 6) :
dbenv = db.DBEnv()
try :
dbenv.repmgr_get_ack_policy()
ReplicationManager_available=True
except :
ReplicationManager_available=False
dbenv.close()
del dbenv
if ReplicationManager_available :
suite.addTest(unittest.makeSuite(DBReplicationManager))
if have_threads :
suite.addTest(unittest.makeSuite(DBBaseReplication))
return suite
if __name__ == '__main__':
unittest.main(defaultTest='test_suite')
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