"""
Copyright (c) 2008-2018, Jesus Cea Avion <jcea@jcea.es>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the following
    disclaimer in the documentation and/or other materials provided
    with the distribution.

    3. Neither the name of Jesus Cea Avion nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
            TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
            DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
    ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.
    """

"""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) :
    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, 0o666)
        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, 0o666)

        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()
        client_port = test_support.find_unused_port()
        if db.version() >= (5, 2) :
            self.site = self.dbenvMaster.repmgr_site("127.0.0.1", master_port)
            self.site.set_config(db.DB_GROUP_CREATOR, True)
            self.site.set_config(db.DB_LOCAL_SITE, True)
            self.site2 = self.dbenvMaster.repmgr_site("127.0.0.1", client_port)

            self.site3 = self.dbenvClient.repmgr_site("127.0.0.1", master_port)
            self.site3.set_config(db.DB_BOOTSTRAP_HELPER, True)
            self.site4 = self.dbenvClient.repmgr_site("127.0.0.1", client_port)
            self.site4.set_config(db.DB_LOCAL_SITE, True)

            d = {
                    db.DB_BOOTSTRAP_HELPER: [False, False, True, False],
                    db.DB_GROUP_CREATOR: [True, False, False, False],
                    db.DB_LEGACY: [False, False, False, False],
                    db.DB_LOCAL_SITE: [True, False, False, True],
                    db.DB_REPMGR_PEER: [False, False, False, False ],
                }

            for i, j in list(d.items()) :
                for k, v in \
                        zip([self.site, self.site2, self.site3, self.site4], j) :
                    if v :
                        self.assertTrue(k.get_config(i))
                    else :
                        self.assertFalse(k.get_config(i))

            self.assertNotEqual(self.site.get_eid(), self.site2.get_eid())
            self.assertNotEqual(self.site3.get_eid(), self.site4.get_eid())

            for i, j in zip([self.site, self.site2, self.site3, self.site4], \
                    [master_port, client_port, master_port, client_port]) :
                addr = i.get_address()
                self.assertEqual(addr, ("127.0.0.1", j))

            for i in [self.site, self.site2] :
                self.assertEqual(i.get_address(),
                        self.dbenvMaster.repmgr_site_by_eid(i.get_eid()).get_address())
            for i in [self.site3, self.site4] :
                self.assertEqual(i.get_address(),
                        self.dbenvClient.repmgr_site_by_eid(i.get_eid()).get_address())
        else :
            self.dbenvMaster.repmgr_set_local_site("127.0.0.1", master_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.assertEqual(self.dbenvMaster.rep_get_timeout(
            db.DB_REP_CONNECTION_RETRY), 100123)
        self.assertEqual(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.assertEqual(self.dbenvMaster.rep_get_timeout(
            db.DB_REP_ELECTION_TIMEOUT), 100234)
        self.assertEqual(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.assertEqual(self.dbenvMaster.rep_get_timeout(
            db.DB_REP_ELECTION_RETRY), 100345)
        self.assertEqual(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.assertEqual(self.dbenvMaster.rep_get_nsites(),2)
        self.assertEqual(self.dbenvClient.rep_get_nsites(),2)
        self.assertEqual(self.dbenvMaster.rep_get_priority(),10)
        self.assertEqual(self.dbenvClient.rep_get_priority(),0)
        self.assertEqual(self.dbenvMaster.repmgr_get_ack_policy(),
                db.DB_REPMGR_ACKS_ALL)
        self.assertEqual(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()+10
        while (time.time()<timeout) and not (self.confirmed_master and self.client_startupdone) :
            time.sleep(0.02)
        self.assertTrue(time.time()<timeout)

        d = self.dbenvMaster.repmgr_site_list()
        self.assertEqual(len(d), 1)
        d = list(d.values())[0]  # There is only one
        self.assertEqual(d[0], "127.0.0.1")
        self.assertEqual(d[1], client_port)
        self.assertTrue((d[2]==db.DB_REPMGR_CONNECTED) or \
                (d[2]==db.DB_REPMGR_DISCONNECTED))

        d = self.dbenvClient.repmgr_site_list()
        self.assertEqual(len(d), 1)
        d = list(d.values())[0]  # There is only one
        self.assertEqual(d[0], "127.0.0.1")
        self.assertEqual(d[1], master_port)
        self.assertTrue((d[2]==db.DB_REPMGR_CONNECTED) or \
                (d[2]==db.DB_REPMGR_DISCONNECTED))

        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, 0o666, 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=0o666, 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)
        self.assertTrue(time.time()<timeout)
        self.assertEqual("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.assertEqual(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.assertEqual(self.dbenvMaster.rep_get_priority(),10)
        self.assertEqual(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()+10
        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, 0o666, 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=0o666, 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.assertEqual("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.assertEqual(None, v)

    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))

    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)

        # Race condition showed up after upgrading to Solaris 10 Update 10
        # https://forums.oracle.com/forums/thread.jspa?messageID=9902860
        # jcea@jcea.es: See private email from Paula Bingham (Oracle),
        # in 20110929.
        while not (self.dbenvClient.rep_stat()["startup_complete"]) :
            pass

    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()
    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')
