Python OplogThread.get_oplog_cursor方法代码示例

# 需要导入模块: from mongo_connector.oplog_manager import OplogThread [as 别名]
# 或者: from mongo_connector.oplog_manager.OplogThread import get_oplog_cursor [as 别名]
class TestOplogManager(unittest.TestCase):
    """Defines all the testing methods, as well as a method that sets up the
        cluster
    """

    def setUp(self):
        _, _, self.primary_p = start_replica_set("test-oplog-manager")
        self.primary_conn = pymongo.MongoClient(mongo_host, self.primary_p)
        self.oplog_coll = self.primary_conn.local["oplog.rs"]
        self.opman = OplogThread(
            primary_conn=self.primary_conn,
            main_address="%s:%d" % (mongo_host, self.primary_p),
            oplog_coll=self.oplog_coll,
            is_sharded=False,
            doc_manager=DocManager(),
            oplog_progress_dict=LockingDict(),
            namespace_set=None,
            auth_key=None,
            auth_username=None,
            repl_set="test-oplog-manager",
        )

    def tearDown(self):
        try:
            self.opman.join()
        except RuntimeError:
            pass  # OplogThread may not have been started
        self.primary_conn.close()
        kill_replica_set("test-oplog-manager")

    def test_get_oplog_cursor(self):
        """Test the get_oplog_cursor method"""

        # timestamp is None - all oplog entries are returned.
        cursor = self.opman.get_oplog_cursor(None)
        self.assertEqual(cursor.count(), self.primary_conn["local"]["oplog.rs"].count())

        # earliest entry is the only one at/after timestamp
        doc = {"ts": bson.Timestamp(1000, 0), "i": 1}
        self.primary_conn["test"]["test"].insert(doc)
        latest_timestamp = self.opman.get_last_oplog_timestamp()
        cursor = self.opman.get_oplog_cursor(latest_timestamp)
        self.assertNotEqual(cursor, None)
        self.assertEqual(cursor.count(), 1)
        next_entry_id = next(cursor)["o"]["_id"]
        retrieved = self.primary_conn.test.test.find_one(next_entry_id)
        self.assertEqual(retrieved, doc)

        # many entries before and after timestamp
        self.primary_conn["test"]["test"].insert({"i": i} for i in range(2, 1002))
        oplog_cursor = self.oplog_coll.find(sort=[("ts", pymongo.ASCENDING)])

        # startup + insert + 1000 inserts
        self.assertEqual(oplog_cursor.count(), 2 + 1000)
        pivot = oplog_cursor.skip(400).limit(1)[0]

        goc_cursor = self.opman.get_oplog_cursor(pivot["ts"])
        self.assertEqual(goc_cursor.count(), 2 + 1000 - 400)

    def test_get_last_oplog_timestamp(self):
        """Test the get_last_oplog_timestamp method"""

        # "empty" the oplog
        self.opman.oplog = self.primary_conn["test"]["emptycollection"]
        self.assertEqual(self.opman.get_last_oplog_timestamp(), None)

        # Test non-empty oplog
        self.opman.oplog = self.primary_conn["local"]["oplog.rs"]
        for i in range(1000):
            self.primary_conn["test"]["test"].insert({"i": i + 500})
        oplog = self.primary_conn["local"]["oplog.rs"]
        oplog = oplog.find().sort("$natural", pymongo.DESCENDING).limit(1)[0]
        self.assertEqual(self.opman.get_last_oplog_timestamp(), oplog["ts"])

    def test_dump_collection(self):
        """Test the dump_collection method

        Cases:

        1. empty oplog
        2. non-empty oplog
        """

        # Test with empty oplog
        self.opman.oplog = self.primary_conn["test"]["emptycollection"]
        last_ts = self.opman.dump_collection()
        self.assertEqual(last_ts, None)

        # Test with non-empty oplog
        self.opman.oplog = self.primary_conn["local"]["oplog.rs"]
        for i in range(1000):
            self.primary_conn["test"]["test"].insert({"i": i + 500})
        last_ts = self.opman.get_last_oplog_timestamp()
        self.assertEqual(last_ts, self.opman.dump_collection())
        self.assertEqual(len(self.opman.doc_managers[0]._search()), 1000)

    def test_dump_collection_with_error(self):
        """Test the dump_collection method with invalid documents.

        Cases:
#.........这里部分代码省略.........

# 需要导入模块: from mongo_connector.oplog_manager import OplogThread [as 别名]
# 或者: from mongo_connector.oplog_manager.OplogThread import get_oplog_cursor [as 别名]

#.........这里部分代码省略.........
            limit=1
        )
        oplog_entry = next(oplog_entries)
        self.assertEqual(self.opman1.retrieve_doc(oplog_entry), doc)

        # Retrieve a document from update operation in oplog
        self.mongos_conn["test"]["mcsharded"].update(
            {"i": 1},
            {"$set": {"sounds-like": "mongo"}}
        )
        oplog_entries = self.shard1_conn["local"]["oplog.rs"].find(
            sort=[("ts", pymongo.DESCENDING)],
            limit=1
        )
        doc["sounds-like"] = "mongo"
        self.assertEqual(self.opman1.retrieve_doc(next(oplog_entries)), doc)

        # Retrieve a document from remove operation in oplog
        # (expected: None)
        self.mongos_conn["test"]["mcsharded"].remove({
            "i": 1
        })
        oplog_entries = self.shard1_conn["local"]["oplog.rs"].find(
            sort=[("ts", pymongo.DESCENDING)],
            limit=1
        )
        self.assertEqual(self.opman1.retrieve_doc(next(oplog_entries)), None)

        # Retrieve a document with bad _id
        # (expected: None)
        oplog_entry["o"]["_id"] = "ThisIsNotAnId123456789"
        self.assertEqual(self.opman1.retrieve_doc(oplog_entry), None)

    def test_get_oplog_cursor(self):
        """Test the get_oplog_cursor method"""

        # Trivial case: timestamp is None
        self.assertEqual(self.opman1.get_oplog_cursor(None), None)

        # earliest entry is after given timestamp
        doc = {"ts": bson.Timestamp(1000, 0), "i": 1}
        self.mongos_conn["test"]["mcsharded"].insert(doc)
        self.assertEqual(self.opman1.get_oplog_cursor(
            bson.Timestamp(1, 0)), None)

        # earliest entry is the only one at/after timestamp
        latest_timestamp = self.opman1.get_last_oplog_timestamp()
        cursor = self.opman1.get_oplog_cursor(latest_timestamp)
        self.assertNotEqual(cursor, None)
        self.assertEqual(cursor.count(), 1)
        self.assertEqual(self.opman1.retrieve_doc(cursor[0]), doc)

        # many entries before and after timestamp
        for i in range(2, 2002):
            self.mongos_conn["test"]["mcsharded"].insert({
                "i": i
            })
        oplog1 = self.shard1_conn["local"]["oplog.rs"].find(
            sort=[("ts", pymongo.ASCENDING)]
        )
        oplog2 = self.shard2_conn["local"]["oplog.rs"].find(
            sort=[("ts", pymongo.ASCENDING)]
        )

        # oplogs should have records for inserts performed, plus
        # various other messages

# 需要导入模块: from mongo_connector.oplog_manager import OplogThread [as 别名]
# 或者: from mongo_connector.oplog_manager.OplogThread import get_oplog_cursor [as 别名]

#.........这里部分代码省略.........
        doc_manager = DocManager()
        oplog_progress = LockingDict()
        self.opman1 = OplogThread(
            primary_client=self.shard1_conn,
            doc_managers=(doc_manager,),
            oplog_progress_dict=oplog_progress,
            ns_set=["test.mcsharded", "test.mcunsharded"],
            mongos_client=self.mongos_conn
        )
        self.opman2 = OplogThread(
            primary_client=self.shard2_conn,
            doc_managers=(doc_manager,),
            oplog_progress_dict=oplog_progress,
            ns_set=["test.mcsharded", "test.mcunsharded"],
            mongos_client=self.mongos_conn
        )

    def tearDown(self):
        try:
            self.opman1.join()
        except RuntimeError:
            pass                # thread may not have been started
        try:
            self.opman2.join()
        except RuntimeError:
            pass                # thread may not have been started
        close_client(self.mongos_conn)
        close_client(self.shard1_conn)
        close_client(self.shard2_conn)
        close_client(self.shard1_secondary_conn)
        close_client(self.shard2_secondary_conn)
        self.cluster.stop()

    def test_get_oplog_cursor(self):
        """Test the get_oplog_cursor method"""

        # timestamp = None
        cursor1 = self.opman1.get_oplog_cursor(None)
        oplog1 = self.shard1_conn["local"]["oplog.rs"].find(
            {'op': {'$ne': 'n'},
             'ns': {'$not': re.compile(r'\.system')}})
        self.assertEqual(list(cursor1), list(oplog1))

        cursor2 = self.opman2.get_oplog_cursor(None)
        oplog2 = self.shard2_conn["local"]["oplog.rs"].find(
            {'op': {'$ne': 'n'},
             'ns': {'$not': re.compile(r'\.system')}})
        self.assertEqual(list(cursor2), list(oplog2))

        # earliest entry is the only one at/after timestamp
        doc = {"ts": bson.Timestamp(1000, 0), "i": 1}
        self.mongos_conn["test"]["mcsharded"].insert_one(doc)
        latest_timestamp = self.opman1.get_last_oplog_timestamp()
        cursor = self.opman1.get_oplog_cursor(latest_timestamp)
        self.assertNotEqual(cursor, None)
        self.assertEqual(cursor.count(), 1)
        next_entry_id = cursor[0]['o']['_id']
        retrieved = self.mongos_conn.test.mcsharded.find_one(next_entry_id)
        self.assertEqual(retrieved, doc)

        # many entries before and after timestamp
        for i in range(2, 2002):
            self.mongos_conn["test"]["mcsharded"].insert_one({
                "i": i
            })
        oplog1 = self.shard1_conn["local"]["oplog.rs"].find(

# 需要导入模块: from mongo_connector.oplog_manager import OplogThread [as 别名]
# 或者: from mongo_connector.oplog_manager.OplogThread import get_oplog_cursor [as 别名]
class TestOplogManager(unittest.TestCase):
    """Defines all the testing methods, as well as a method that sets up the
        cluster
    """

    def setUp(self):
        self.repl_set = ReplicaSetSingle().start()
        self.primary_conn = self.repl_set.client()
        self.oplog_coll = self.primary_conn.local["oplog.rs"]
        self.opman = OplogThread(
            primary_client=self.primary_conn,
            doc_managers=(DocManager(),),
            oplog_progress_dict=LockingDict(),
            namespace_config=NamespaceConfig(
                namespace_options={"test.*": True, "gridfs.*": {"gridfs": True}}
            ),
        )

    def tearDown(self):
        try:
            self.opman.join()
        except RuntimeError:
            pass  # OplogThread may not have been started
        self.primary_conn.drop_database("test")
        close_client(self.primary_conn)
        self.repl_set.stop()

    def test_get_oplog_cursor(self):
        """Test the get_oplog_cursor method"""

        # timestamp is None - all oplog entries excluding no-ops are returned.
        cursor = self.opman.get_oplog_cursor(None)
        self.assertEqual(
            cursor.count(),
            self.primary_conn["local"]["oplog.rs"].find({"op": {"$ne": "n"}}).count(),
        )

        # earliest entry is the only one at/after timestamp
        doc = {"ts": bson.Timestamp(1000, 0), "i": 1}
        self.primary_conn["test"]["test"].insert_one(doc)
        latest_timestamp = self.opman.get_last_oplog_timestamp()
        cursor = self.opman.get_oplog_cursor(latest_timestamp)
        self.assertNotEqual(cursor, None)
        self.assertEqual(cursor.count(), 1)
        next_entry_id = next(cursor)["o"]["_id"]
        retrieved = self.primary_conn.test.test.find_one(next_entry_id)
        self.assertEqual(retrieved, doc)

        # many entries before and after timestamp
        self.primary_conn["test"]["test"].insert_many(
            [{"i": i} for i in range(2, 1002)]
        )
        oplog_cursor = self.oplog_coll.find(
            {"op": {"$ne": "n"}, "ns": {"$not": re.compile(r"\.(system|\$cmd)")}},
            sort=[("ts", pymongo.ASCENDING)],
        )

        # initial insert + 1000 more inserts
        self.assertEqual(oplog_cursor.count(), 1 + 1000)
        pivot = oplog_cursor.skip(400).limit(-1)[0]

        goc_cursor = self.opman.get_oplog_cursor(pivot["ts"])
        self.assertEqual(goc_cursor.count(), 1 + 1000 - 400)

    def test_get_last_oplog_timestamp(self):
        """Test the get_last_oplog_timestamp method"""

        # "empty" the oplog
        self.opman.oplog = self.primary_conn["test"]["emptycollection"]
        self.assertEqual(self.opman.get_last_oplog_timestamp(), None)

        # Test non-empty oplog
        self.opman.oplog = self.primary_conn["local"]["oplog.rs"]
        for i in range(1000):
            self.primary_conn["test"]["test"].insert_one({"i": i + 500})
        oplog = self.primary_conn["local"]["oplog.rs"]
        oplog = oplog.find().sort("$natural", pymongo.DESCENDING).limit(-1)[0]
        self.assertEqual(self.opman.get_last_oplog_timestamp(), oplog["ts"])

    def test_dump_collection(self):
        """Test the dump_collection method

        Cases:

        1. empty oplog
        2. non-empty oplog, with gridfs collections
        3. non-empty oplog, specified a namespace-set, none of the oplog
           entries are for collections in the namespace-set
        """

        # Test with empty oplog
        self.opman.oplog = self.primary_conn["test"]["emptycollection"]
        last_ts = self.opman.dump_collection()
        self.assertEqual(last_ts, None)

        # Test with non-empty oplog with gridfs collections
        self.opman.oplog = self.primary_conn["local"]["oplog.rs"]
        # Insert 10 gridfs files
        for i in range(10):
            fs = gridfs.GridFS(self.primary_conn["gridfs"], collection="test" + str(i))
#.........这里部分代码省略.........

# 需要导入模块: from mongo_connector.oplog_manager import OplogThread [as 别名]
# 或者: from mongo_connector.oplog_manager.OplogThread import get_oplog_cursor [as 别名]
class TestOplogManager(unittest.TestCase):
    """Defines all the testing methods, as well as a method that sets up the
        cluster
    """

    def setUp(self):
        _, _, self.primary_p = start_replica_set('test-oplog-manager')
        self.primary_conn = pymongo.MongoClient(mongo_host, self.primary_p)
        self.oplog_coll = self.primary_conn.local['oplog.rs']
        self.opman = OplogThread(
            primary_conn=self.primary_conn,
            main_address='%s:%d' % (mongo_host, self.primary_p),
            oplog_coll=self.oplog_coll,
            is_sharded=False,
            doc_manager=DocManager(),
            oplog_progress_dict=LockingDict(),
            namespace_set=None,
            auth_key=None,
            auth_username=None,
            repl_set='test-oplog-manager'
        )

    def tearDown(self):
        try:
            self.opman.join()
        except RuntimeError:
            pass                # OplogThread may not have been started
        self.primary_conn.close()
        kill_replica_set('test-oplog-manager')

    def test_retrieve_doc(self):
        """ Test the retrieve_doc method """

        # Trivial case where the oplog entry is None
        self.assertEqual(self.opman.retrieve_doc(None), None)

        # Retrieve a document from insert operation in oplog
        doc = {"name": "mango", "type": "fruit",
               "ns": "test.test", "weight": 3.24, "i": 1}
        self.primary_conn["test"]["test"].insert(doc)
        oplog_entries = self.primary_conn["local"]["oplog.rs"].find(
            sort=[("ts", pymongo.DESCENDING)],
            limit=1
        )
        oplog_entry = next(oplog_entries)
        self.assertEqual(self.opman.retrieve_doc(oplog_entry), doc)

        # Retrieve a document from update operation in oplog
        self.primary_conn["test"]["test"].update(
            {"i": 1},
            {"$set": {"sounds-like": "mongo"}}
        )
        oplog_entries = self.primary_conn["local"]["oplog.rs"].find(
            sort=[("ts", pymongo.DESCENDING)],
            limit=1
        )
        doc["sounds-like"] = "mongo"
        self.assertEqual(self.opman.retrieve_doc(next(oplog_entries)), doc)

        # Retrieve a document from remove operation in oplog
        # (expected: None)
        self.primary_conn["test"]["test"].remove({
            "i": 1
        })
        oplog_entries = self.primary_conn["local"]["oplog.rs"].find(
            sort=[("ts", pymongo.DESCENDING)],
            limit=1
        )
        self.assertEqual(self.opman.retrieve_doc(next(oplog_entries)), None)

        # Retrieve a document with bad _id
        # (expected: None)
        oplog_entry["o"]["_id"] = "ThisIsNotAnId123456789"
        self.assertEqual(self.opman.retrieve_doc(oplog_entry), None)

    def test_get_oplog_cursor(self):
        '''Test the get_oplog_cursor method'''

        # Trivial case: timestamp is None
        self.assertEqual(self.opman.get_oplog_cursor(None), None)

        # earliest entry is after given timestamp
        doc = {"ts": bson.Timestamp(1000, 0), "i": 1}
        self.primary_conn["test"]["test"].insert(doc)
        self.assertEqual(self.opman.get_oplog_cursor(
            bson.Timestamp(1, 0)), None)

        # earliest entry is the only one at/after timestamp
        latest_timestamp = self.opman.get_last_oplog_timestamp()
        cursor = self.opman.get_oplog_cursor(latest_timestamp)
        self.assertNotEqual(cursor, None)
        self.assertEqual(cursor.count(), 1)
        self.assertEqual(self.opman.retrieve_doc(next(cursor)), doc)

        # many entries before and after timestamp
        self.primary_conn["test"]["test"].insert(
            {"i": i} for i in range(2, 1002))
        oplog_cursor = self.oplog_coll.find(
            sort=[("ts", pymongo.ASCENDING)]
        )
#.........这里部分代码省略.........

# 需要导入模块: from mongo_connector.oplog_manager import OplogThread [as 别名]
# 或者: from mongo_connector.oplog_manager.OplogThread import get_oplog_cursor [as 别名]
class TestOplogManager(unittest.TestCase):
    """Defines all the testing methods, as well as a method that sets up the
        cluster
    """

    def setUp(self):
        self.repl_set = ReplicaSetSingle().start()
        self.primary_conn = self.repl_set.client()
        self.oplog_coll = self.primary_conn.local['oplog.rs']

    def reset_opman(self, include_ns=None, exclude_ns=None, dest_mapping=None):
        if include_ns is None:
            include_ns = []
        if exclude_ns is None:
            exclude_ns = []
        if dest_mapping is None:
            dest_mapping = {}

        # include_ns must not exist together with exclude_ns
        # dest_mapping must exist together with include_ns
        # those checks have been tested in test_config.py so we skip that here.

        self.dest_mapping_stru = DestMapping(include_ns, exclude_ns,
                                             dest_mapping)
        self.opman = OplogThread(
            primary_client=self.primary_conn,
            doc_managers=(DocManager(),),
            oplog_progress_dict=LockingDict(),
            dest_mapping_stru=self.dest_mapping_stru,
            ns_set=include_ns,
            ex_ns_set=exclude_ns
        )

    def init_dbs(self):
        # includedb1.* & includedb2.includecol1 are interested collections
        self.primary_conn["includedb1"]["includecol1"].insert_many(
            [{"idb1col1": i} for i in range(1, 3)])

        self.primary_conn["includedb1"]["includecol2"].insert_many(
            [{"idb1col2": i} for i in range(1, 3)])

        self.primary_conn["includedb2"]["includecol1"].insert_many(
            [{"idb2col1": i} for i in range(1, 3)])

        # the others are not interested collections
        self.primary_conn["includedb2"]["excludecol2"].insert_many(
            [{"idb2col2": i} for i in range(1, 3)])

        self.primary_conn["excludedb3"]["excludecol1"].insert_many(
            [{"idb3col1": i} for i in range(1, 3)])

    def tearDown(self):
        try:
            self.opman.join()
        except RuntimeError:
            pass                # OplogThread may not have been started

        for db in self.primary_conn.database_names():
            if db != "local":
                self.primary_conn.drop_database(db)
        close_client(self.primary_conn)
        self.repl_set.stop()

    def test_get_oplog_cursor(self):
        '''Test the get_oplog_cursor method'''

        # Put something in the dbs
        self.init_dbs()

        # timestamp is None - all oplog entries excluding no-ops are returned.
        # wildcard include case no impact the result
        self.reset_opman(["includedb1.*", "includedb2.includecol1"], [], {})

        got_cursor = self.opman.get_oplog_cursor(None)
        oplog_cursor = self.oplog_coll.find(
            {'op': {'$ne': 'n'}})
        self.assertNotEqual(got_cursor, None)
        self.assertEqual(got_cursor.count(), oplog_cursor.count())

        # wildcard exclude case no impact the result
        self.reset_opman([], ["includedb2.excludecol2", "excludedb3.*"], {})

        got_cursor = self.opman.get_oplog_cursor(None)
        oplog_cursor = self.oplog_coll.find(
            {'op': {'$ne': 'n'}})
        self.assertNotEqual(got_cursor, None)
        self.assertEqual(got_cursor.count(), oplog_cursor.count())

        # earliest entry is the only one at/after timestamp
        doc = {"ts": bson.Timestamp(1000, 0), "idb1col1": 1}
        self.primary_conn["includedb1"]["includecol1"].insert_one(doc)
        latest_timestamp = self.opman.get_last_oplog_timestamp()
        cursor = self.opman.get_oplog_cursor(latest_timestamp)
        self.assertNotEqual(cursor, None)
        self.assertEqual(cursor.count(), 1)
        next_entry_id = next(cursor)['o']['_id']
        retrieved = self.primary_conn.includedb1.includecol1.find_one(
                    next_entry_id)
        self.assertEqual(retrieved, doc)

#.........这里部分代码省略.........

# 需要导入模块: from mongo_connector.oplog_manager import OplogThread [as 别名]
# 或者: from mongo_connector.oplog_manager.OplogThread import get_oplog_cursor [as 别名]
class TestOplogManager(unittest.TestCase):
    """Defines all the testing methods, as well as a method that sets up the
        cluster
    """

    def setUp(self):
        self.repl_set = ReplicaSet().start()
        self.primary_conn = self.repl_set.client()
        self.oplog_coll = self.primary_conn.local['oplog.rs']
        self.opman = OplogThread(
            primary_client=self.primary_conn,
            doc_managers=(DocManager(),),
            oplog_progress_dict=LockingDict()
        )

    def tearDown(self):
        try:
            self.opman.join()
        except RuntimeError:
            pass                # OplogThread may not have been started
        self.primary_conn.drop_database("test")
        close_client(self.primary_conn)
        self.repl_set.stop()

    def test_get_oplog_cursor(self):
        '''Test the get_oplog_cursor method'''

        # timestamp is None - all oplog entries are returned.
        cursor = self.opman.get_oplog_cursor(None)
        self.assertEqual(cursor.count(),
                         self.primary_conn["local"]["oplog.rs"].count())

        # earliest entry is the only one at/after timestamp
        doc = {"ts": bson.Timestamp(1000, 0), "i": 1}
        self.primary_conn["test"]["test"].insert_one(doc)
        latest_timestamp = self.opman.get_last_oplog_timestamp()
        cursor = self.opman.get_oplog_cursor(latest_timestamp)
        self.assertNotEqual(cursor, None)
        self.assertEqual(cursor.count(), 1)
        next_entry_id = next(cursor)['o']['_id']
        retrieved = self.primary_conn.test.test.find_one(next_entry_id)
        self.assertEqual(retrieved, doc)

        # many entries before and after timestamp
        self.primary_conn["test"]["test"].insert_many(
            [{"i": i} for i in range(2, 1002)])
        oplog_cursor = self.oplog_coll.find(
            {'op': {'$ne': 'n'},
             'ns': {'$not': re.compile(r'\.(system|\$cmd)')}},
            sort=[("ts", pymongo.ASCENDING)]
        )

        # initial insert + 1000 more inserts
        self.assertEqual(oplog_cursor.count(), 1 + 1000)
        pivot = oplog_cursor.skip(400).limit(-1)[0]

        goc_cursor = self.opman.get_oplog_cursor(pivot["ts"])
        self.assertEqual(goc_cursor.count(), 1 + 1000 - 400)

    def test_get_last_oplog_timestamp(self):
        """Test the get_last_oplog_timestamp method"""

        # "empty" the oplog
        self.opman.oplog = self.primary_conn["test"]["emptycollection"]
        self.assertEqual(self.opman.get_last_oplog_timestamp(), None)

        # Test non-empty oplog
        self.opman.oplog = self.primary_conn["local"]["oplog.rs"]
        for i in range(1000):
            self.primary_conn["test"]["test"].insert_one({
                "i": i + 500
            })
        oplog = self.primary_conn["local"]["oplog.rs"]
        oplog = oplog.find().sort("$natural", pymongo.DESCENDING).limit(-1)[0]
        self.assertEqual(self.opman.get_last_oplog_timestamp(),
                         oplog["ts"])

    def test_dump_collection(self):
        """Test the dump_collection method

        Cases:

        1. empty oplog
        2. non-empty oplog
        """

        # Test with empty oplog
        self.opman.oplog = self.primary_conn["test"]["emptycollection"]
        last_ts = self.opman.dump_collection()
        self.assertEqual(last_ts, None)

        # Test with non-empty oplog
        self.opman.oplog = self.primary_conn["local"]["oplog.rs"]
        for i in range(1000):
            self.primary_conn["test"]["test"].insert_one({
                "i": i + 500
            })
        last_ts = self.opman.get_last_oplog_timestamp()
        self.assertEqual(last_ts, self.opman.dump_collection())
        self.assertEqual(len(self.opman.doc_managers[0]._search()), 1000)
#.........这里部分代码省略.........