689 lines
27 KiB
Python
689 lines
27 KiB
Python
# Copyright 2020 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import List, Optional
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from twisted.test.proto_helpers import MemoryReactor
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from synapse.server import HomeServer
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from synapse.storage.database import DatabasePool, LoggingTransaction
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from synapse.storage.engines import IncorrectDatabaseSetup
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from synapse.storage.util.id_generators import MultiWriterIdGenerator
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from synapse.util import Clock
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from tests.unittest import HomeserverTestCase
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from tests.utils import USE_POSTGRES_FOR_TESTS
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class MultiWriterIdGeneratorTestCase(HomeserverTestCase):
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if not USE_POSTGRES_FOR_TESTS:
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skip = "Requires Postgres"
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
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self.store = hs.get_datastores().main
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self.db_pool: DatabasePool = self.store.db_pool
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self.get_success(self.db_pool.runInteraction("_setup_db", self._setup_db))
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def _setup_db(self, txn: LoggingTransaction) -> None:
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txn.execute("CREATE SEQUENCE foobar_seq")
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txn.execute(
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"""
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CREATE TABLE foobar (
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stream_id BIGINT NOT NULL,
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instance_name TEXT NOT NULL,
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data TEXT
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);
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"""
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)
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def _create_id_generator(
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self, instance_name="master", writers: Optional[List[str]] = None
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) -> MultiWriterIdGenerator:
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def _create(conn):
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return MultiWriterIdGenerator(
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conn,
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self.db_pool,
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stream_name="test_stream",
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instance_name=instance_name,
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tables=[("foobar", "instance_name", "stream_id")],
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sequence_name="foobar_seq",
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writers=writers or ["master"],
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)
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return self.get_success_or_raise(self.db_pool.runWithConnection(_create))
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def _insert_rows(self, instance_name: str, number: int) -> None:
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"""Insert N rows as the given instance, inserting with stream IDs pulled
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from the postgres sequence.
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"""
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def _insert(txn: LoggingTransaction) -> None:
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for _ in range(number):
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txn.execute(
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"INSERT INTO foobar VALUES (nextval('foobar_seq'), ?)",
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(instance_name,),
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)
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txn.execute(
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"""
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INSERT INTO stream_positions VALUES ('test_stream', ?, lastval())
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ON CONFLICT (stream_name, instance_name) DO UPDATE SET stream_id = lastval()
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""",
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(instance_name,),
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)
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self.get_success(self.db_pool.runInteraction("_insert_rows", _insert))
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def _insert_row_with_id(self, instance_name: str, stream_id: int) -> None:
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"""Insert one row as the given instance with given stream_id, updating
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the postgres sequence position to match.
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"""
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def _insert(txn: LoggingTransaction) -> None:
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txn.execute(
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"INSERT INTO foobar VALUES (?, ?)",
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(
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stream_id,
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instance_name,
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),
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)
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txn.execute("SELECT setval('foobar_seq', ?)", (stream_id,))
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txn.execute(
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"""
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INSERT INTO stream_positions VALUES ('test_stream', ?, ?)
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ON CONFLICT (stream_name, instance_name) DO UPDATE SET stream_id = ?
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""",
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(instance_name, stream_id, stream_id),
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)
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self.get_success(self.db_pool.runInteraction("_insert_row_with_id", _insert))
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def test_empty(self) -> None:
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"""Test an ID generator against an empty database gives sensible
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current positions.
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"""
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id_gen = self._create_id_generator()
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# The table is empty so we expect an empty map for positions
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self.assertEqual(id_gen.get_positions(), {})
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def test_single_instance(self) -> None:
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"""Test that reads and writes from a single process are handled
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correctly.
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"""
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# Prefill table with 7 rows written by 'master'
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self._insert_rows("master", 7)
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id_gen = self._create_id_generator()
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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# Try allocating a new ID gen and check that we only see position
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# advanced after we leave the context manager.
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async def _get_next_async() -> None:
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async with id_gen.get_next() as stream_id:
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self.assertEqual(stream_id, 8)
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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self.get_success(_get_next_async())
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self.assertEqual(id_gen.get_positions(), {"master": 8})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 8)
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def test_out_of_order_finish(self) -> None:
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"""Test that IDs persisted out of order are correctly handled"""
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# Prefill table with 7 rows written by 'master'
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self._insert_rows("master", 7)
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id_gen = self._create_id_generator()
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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ctx1 = id_gen.get_next()
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ctx2 = id_gen.get_next()
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ctx3 = id_gen.get_next()
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ctx4 = id_gen.get_next()
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s1 = self.get_success(ctx1.__aenter__())
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s2 = self.get_success(ctx2.__aenter__())
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s3 = self.get_success(ctx3.__aenter__())
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s4 = self.get_success(ctx4.__aenter__())
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self.assertEqual(s1, 8)
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self.assertEqual(s2, 9)
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self.assertEqual(s3, 10)
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self.assertEqual(s4, 11)
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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self.get_success(ctx2.__aexit__(None, None, None))
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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self.get_success(ctx1.__aexit__(None, None, None))
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self.assertEqual(id_gen.get_positions(), {"master": 9})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 9)
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self.get_success(ctx4.__aexit__(None, None, None))
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self.assertEqual(id_gen.get_positions(), {"master": 9})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 9)
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self.get_success(ctx3.__aexit__(None, None, None))
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self.assertEqual(id_gen.get_positions(), {"master": 11})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 11)
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def test_multi_instance(self) -> None:
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"""Test that reads and writes from multiple processes are handled
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correctly.
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"""
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self._insert_rows("first", 3)
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self._insert_rows("second", 4)
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first_id_gen = self._create_id_generator("first", writers=["first", "second"])
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second_id_gen = self._create_id_generator("second", writers=["first", "second"])
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# The first ID gen will notice that it can advance its token to 7 as it
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# has no in progress writes...
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self.assertEqual(first_id_gen.get_positions(), {"first": 7, "second": 7})
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self.assertEqual(first_id_gen.get_current_token_for_writer("first"), 7)
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self.assertEqual(first_id_gen.get_current_token_for_writer("second"), 7)
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# ... but the second ID gen doesn't know that.
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self.assertEqual(second_id_gen.get_positions(), {"first": 3, "second": 7})
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self.assertEqual(second_id_gen.get_current_token_for_writer("first"), 3)
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self.assertEqual(second_id_gen.get_current_token_for_writer("second"), 7)
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# Try allocating a new ID gen and check that we only see position
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# advanced after we leave the context manager.
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async def _get_next_async() -> None:
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async with first_id_gen.get_next() as stream_id:
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self.assertEqual(stream_id, 8)
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self.assertEqual(
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first_id_gen.get_positions(), {"first": 7, "second": 7}
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)
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self.get_success(_get_next_async())
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self.assertEqual(first_id_gen.get_positions(), {"first": 8, "second": 7})
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# However the ID gen on the second instance won't have seen the update
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self.assertEqual(second_id_gen.get_positions(), {"first": 3, "second": 7})
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# ... but calling `get_next` on the second instance should give a unique
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# stream ID
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async def _get_next_async2() -> None:
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async with second_id_gen.get_next() as stream_id:
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self.assertEqual(stream_id, 9)
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self.assertEqual(
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second_id_gen.get_positions(), {"first": 3, "second": 7}
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)
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self.get_success(_get_next_async2())
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self.assertEqual(second_id_gen.get_positions(), {"first": 3, "second": 9})
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# If the second ID gen gets told about the first, it correctly updates
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second_id_gen.advance("first", 8)
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self.assertEqual(second_id_gen.get_positions(), {"first": 8, "second": 9})
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def test_get_next_txn(self) -> None:
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"""Test that the `get_next_txn` function works correctly."""
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# Prefill table with 7 rows written by 'master'
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self._insert_rows("master", 7)
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id_gen = self._create_id_generator()
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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# Try allocating a new ID gen and check that we only see position
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# advanced after we leave the context manager.
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def _get_next_txn(txn: LoggingTransaction) -> None:
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stream_id = id_gen.get_next_txn(txn)
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self.assertEqual(stream_id, 8)
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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self.get_success(self.db_pool.runInteraction("test", _get_next_txn))
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self.assertEqual(id_gen.get_positions(), {"master": 8})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 8)
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def test_get_persisted_upto_position(self) -> None:
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"""Test that `get_persisted_upto_position` correctly tracks updates to
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positions.
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"""
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# The following tests are a bit cheeky in that we notify about new
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# positions via `advance` without *actually* advancing the postgres
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# sequence.
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self._insert_row_with_id("first", 3)
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self._insert_row_with_id("second", 5)
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id_gen = self._create_id_generator("worker", writers=["first", "second"])
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self.assertEqual(id_gen.get_positions(), {"first": 3, "second": 5})
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# Min is 3 and there is a gap between 5, so we expect it to be 3.
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self.assertEqual(id_gen.get_persisted_upto_position(), 3)
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# We advance "first" straight to 6. Min is now 5 but there is no gap so
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# we expect it to be 6
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id_gen.advance("first", 6)
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self.assertEqual(id_gen.get_persisted_upto_position(), 6)
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# No gap, so we expect 7.
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id_gen.advance("second", 7)
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self.assertEqual(id_gen.get_persisted_upto_position(), 7)
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# We haven't seen 8 yet, so we expect 7 still.
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id_gen.advance("second", 9)
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self.assertEqual(id_gen.get_persisted_upto_position(), 7)
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# Now that we've seen 7, 8 and 9 we can got straight to 9.
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id_gen.advance("first", 8)
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self.assertEqual(id_gen.get_persisted_upto_position(), 9)
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# Jump forward with gaps. The minimum is 11, even though we haven't seen
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# 10 we know that everything before 11 must be persisted.
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id_gen.advance("first", 11)
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id_gen.advance("second", 15)
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self.assertEqual(id_gen.get_persisted_upto_position(), 11)
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def test_get_persisted_upto_position_get_next(self) -> None:
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"""Test that `get_persisted_upto_position` correctly tracks updates to
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positions when `get_next` is called.
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"""
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self._insert_row_with_id("first", 3)
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self._insert_row_with_id("second", 5)
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id_gen = self._create_id_generator("first", writers=["first", "second"])
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self.assertEqual(id_gen.get_positions(), {"first": 5, "second": 5})
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self.assertEqual(id_gen.get_persisted_upto_position(), 5)
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async def _get_next_async() -> None:
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async with id_gen.get_next() as stream_id:
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self.assertEqual(stream_id, 6)
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self.assertEqual(id_gen.get_persisted_upto_position(), 5)
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self.get_success(_get_next_async())
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self.assertEqual(id_gen.get_persisted_upto_position(), 6)
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# We assume that so long as `get_next` does correctly advance the
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# `persisted_upto_position` in this case, then it will be correct in the
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# other cases that are tested above (since they'll hit the same code).
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def test_restart_during_out_of_order_persistence(self) -> None:
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"""Test that restarting a process while another process is writing out
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of order updates are handled correctly.
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"""
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# Prefill table with 7 rows written by 'master'
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self._insert_rows("master", 7)
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id_gen = self._create_id_generator()
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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# Persist two rows at once
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ctx1 = id_gen.get_next()
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ctx2 = id_gen.get_next()
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s1 = self.get_success(ctx1.__aenter__())
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s2 = self.get_success(ctx2.__aenter__())
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self.assertEqual(s1, 8)
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self.assertEqual(s2, 9)
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self.assertEqual(id_gen.get_positions(), {"master": 7})
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self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
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# We finish persisting the second row before restart
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self.get_success(ctx2.__aexit__(None, None, None))
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# We simulate a restart of another worker by just creating a new ID gen.
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id_gen_worker = self._create_id_generator("worker")
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# Restarted worker should not see the second persisted row
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self.assertEqual(id_gen_worker.get_positions(), {"master": 7})
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self.assertEqual(id_gen_worker.get_current_token_for_writer("master"), 7)
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# Now if we persist the first row then both instances should jump ahead
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# correctly.
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self.get_success(ctx1.__aexit__(None, None, None))
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self.assertEqual(id_gen.get_positions(), {"master": 9})
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id_gen_worker.advance("master", 9)
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self.assertEqual(id_gen_worker.get_positions(), {"master": 9})
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def test_writer_config_change(self) -> None:
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"""Test that changing the writer config correctly works."""
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self._insert_row_with_id("first", 3)
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self._insert_row_with_id("second", 5)
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# Initial config has two writers
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id_gen = self._create_id_generator("worker", writers=["first", "second"])
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self.assertEqual(id_gen.get_persisted_upto_position(), 3)
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self.assertEqual(id_gen.get_current_token_for_writer("first"), 3)
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self.assertEqual(id_gen.get_current_token_for_writer("second"), 5)
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# New config removes one of the configs. Note that if the writer is
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# removed from config we assume that it has been shut down and has
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# finished persisting, hence why the persisted upto position is 5.
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id_gen_2 = self._create_id_generator("second", writers=["second"])
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self.assertEqual(id_gen_2.get_persisted_upto_position(), 5)
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self.assertEqual(id_gen_2.get_current_token_for_writer("second"), 5)
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# This config points to a single, previously unused writer.
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id_gen_3 = self._create_id_generator("third", writers=["third"])
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self.assertEqual(id_gen_3.get_persisted_upto_position(), 5)
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# For new writers we assume their initial position to be the current
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# persisted up to position. This stops Synapse from doing a full table
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# scan when a new writer comes along.
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self.assertEqual(id_gen_3.get_current_token_for_writer("third"), 5)
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id_gen_4 = self._create_id_generator("fourth", writers=["third"])
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self.assertEqual(id_gen_4.get_current_token_for_writer("third"), 5)
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# Check that we get a sane next stream ID with this new config.
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async def _get_next_async() -> None:
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async with id_gen_3.get_next() as stream_id:
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self.assertEqual(stream_id, 6)
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self.get_success(_get_next_async())
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self.assertEqual(id_gen_3.get_persisted_upto_position(), 6)
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# If we add back the old "first" then we shouldn't see the persisted up
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# to position revert back to 3.
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id_gen_5 = self._create_id_generator("five", writers=["first", "third"])
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self.assertEqual(id_gen_5.get_persisted_upto_position(), 6)
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self.assertEqual(id_gen_5.get_current_token_for_writer("first"), 6)
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self.assertEqual(id_gen_5.get_current_token_for_writer("third"), 6)
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def test_sequence_consistency(self) -> None:
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"""Test that we error out if the table and sequence diverges."""
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# Prefill with some rows
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self._insert_row_with_id("master", 3)
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# Now we add a row *without* updating the stream ID
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def _insert(txn):
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txn.execute("INSERT INTO foobar VALUES (26, 'master')")
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self.get_success(self.db_pool.runInteraction("_insert", _insert))
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# Creating the ID gen should error
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with self.assertRaises(IncorrectDatabaseSetup):
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self._create_id_generator("first")
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class BackwardsMultiWriterIdGeneratorTestCase(HomeserverTestCase):
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"""Tests MultiWriterIdGenerator that produce *negative* stream IDs."""
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if not USE_POSTGRES_FOR_TESTS:
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skip = "Requires Postgres"
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
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self.store = hs.get_datastores().main
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self.db_pool: DatabasePool = self.store.db_pool
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self.get_success(self.db_pool.runInteraction("_setup_db", self._setup_db))
|
|
|
|
def _setup_db(self, txn: LoggingTransaction) -> None:
|
|
txn.execute("CREATE SEQUENCE foobar_seq")
|
|
txn.execute(
|
|
"""
|
|
CREATE TABLE foobar (
|
|
stream_id BIGINT NOT NULL,
|
|
instance_name TEXT NOT NULL,
|
|
data TEXT
|
|
);
|
|
"""
|
|
)
|
|
|
|
def _create_id_generator(
|
|
self, instance_name="master", writers: Optional[List[str]] = None
|
|
) -> MultiWriterIdGenerator:
|
|
def _create(conn):
|
|
return MultiWriterIdGenerator(
|
|
conn,
|
|
self.db_pool,
|
|
stream_name="test_stream",
|
|
instance_name=instance_name,
|
|
tables=[("foobar", "instance_name", "stream_id")],
|
|
sequence_name="foobar_seq",
|
|
writers=writers or ["master"],
|
|
positive=False,
|
|
)
|
|
|
|
return self.get_success(self.db_pool.runWithConnection(_create))
|
|
|
|
def _insert_row(self, instance_name: str, stream_id: int) -> None:
|
|
"""Insert one row as the given instance with given stream_id."""
|
|
|
|
def _insert(txn: LoggingTransaction) -> None:
|
|
txn.execute(
|
|
"INSERT INTO foobar VALUES (?, ?)",
|
|
(
|
|
stream_id,
|
|
instance_name,
|
|
),
|
|
)
|
|
txn.execute(
|
|
"""
|
|
INSERT INTO stream_positions VALUES ('test_stream', ?, ?)
|
|
ON CONFLICT (stream_name, instance_name) DO UPDATE SET stream_id = ?
|
|
""",
|
|
(instance_name, -stream_id, -stream_id),
|
|
)
|
|
|
|
self.get_success(self.db_pool.runInteraction("_insert_row", _insert))
|
|
|
|
def test_single_instance(self) -> None:
|
|
"""Test that reads and writes from a single process are handled
|
|
correctly.
|
|
"""
|
|
id_gen = self._create_id_generator()
|
|
|
|
async def _get_next_async() -> None:
|
|
async with id_gen.get_next() as stream_id:
|
|
self._insert_row("master", stream_id)
|
|
|
|
self.get_success(_get_next_async())
|
|
|
|
self.assertEqual(id_gen.get_positions(), {"master": -1})
|
|
self.assertEqual(id_gen.get_current_token_for_writer("master"), -1)
|
|
self.assertEqual(id_gen.get_persisted_upto_position(), -1)
|
|
|
|
async def _get_next_async2() -> None:
|
|
async with id_gen.get_next_mult(3) as stream_ids:
|
|
for stream_id in stream_ids:
|
|
self._insert_row("master", stream_id)
|
|
|
|
self.get_success(_get_next_async2())
|
|
|
|
self.assertEqual(id_gen.get_positions(), {"master": -4})
|
|
self.assertEqual(id_gen.get_current_token_for_writer("master"), -4)
|
|
self.assertEqual(id_gen.get_persisted_upto_position(), -4)
|
|
|
|
# Test loading from DB by creating a second ID gen
|
|
second_id_gen = self._create_id_generator()
|
|
|
|
self.assertEqual(second_id_gen.get_positions(), {"master": -4})
|
|
self.assertEqual(second_id_gen.get_current_token_for_writer("master"), -4)
|
|
self.assertEqual(second_id_gen.get_persisted_upto_position(), -4)
|
|
|
|
def test_multiple_instance(self) -> None:
|
|
"""Tests that having multiple instances that get advanced over
|
|
federation works corretly.
|
|
"""
|
|
id_gen_1 = self._create_id_generator("first", writers=["first", "second"])
|
|
id_gen_2 = self._create_id_generator("second", writers=["first", "second"])
|
|
|
|
async def _get_next_async() -> None:
|
|
async with id_gen_1.get_next() as stream_id:
|
|
self._insert_row("first", stream_id)
|
|
id_gen_2.advance("first", stream_id)
|
|
|
|
self.get_success(_get_next_async())
|
|
|
|
self.assertEqual(id_gen_1.get_positions(), {"first": -1})
|
|
self.assertEqual(id_gen_2.get_positions(), {"first": -1})
|
|
self.assertEqual(id_gen_1.get_persisted_upto_position(), -1)
|
|
self.assertEqual(id_gen_2.get_persisted_upto_position(), -1)
|
|
|
|
async def _get_next_async2() -> None:
|
|
async with id_gen_2.get_next() as stream_id:
|
|
self._insert_row("second", stream_id)
|
|
id_gen_1.advance("second", stream_id)
|
|
|
|
self.get_success(_get_next_async2())
|
|
|
|
self.assertEqual(id_gen_1.get_positions(), {"first": -2, "second": -2})
|
|
self.assertEqual(id_gen_2.get_positions(), {"first": -1, "second": -2})
|
|
self.assertEqual(id_gen_1.get_persisted_upto_position(), -2)
|
|
self.assertEqual(id_gen_2.get_persisted_upto_position(), -2)
|
|
|
|
|
|
class MultiTableMultiWriterIdGeneratorTestCase(HomeserverTestCase):
|
|
if not USE_POSTGRES_FOR_TESTS:
|
|
skip = "Requires Postgres"
|
|
|
|
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
|
|
self.store = hs.get_datastores().main
|
|
self.db_pool: DatabasePool = self.store.db_pool
|
|
|
|
self.get_success(self.db_pool.runInteraction("_setup_db", self._setup_db))
|
|
|
|
def _setup_db(self, txn: LoggingTransaction) -> None:
|
|
txn.execute("CREATE SEQUENCE foobar_seq")
|
|
txn.execute(
|
|
"""
|
|
CREATE TABLE foobar1 (
|
|
stream_id BIGINT NOT NULL,
|
|
instance_name TEXT NOT NULL,
|
|
data TEXT
|
|
);
|
|
"""
|
|
)
|
|
|
|
txn.execute(
|
|
"""
|
|
CREATE TABLE foobar2 (
|
|
stream_id BIGINT NOT NULL,
|
|
instance_name TEXT NOT NULL,
|
|
data TEXT
|
|
);
|
|
"""
|
|
)
|
|
|
|
def _create_id_generator(
|
|
self, instance_name="master", writers: Optional[List[str]] = None
|
|
) -> MultiWriterIdGenerator:
|
|
def _create(conn):
|
|
return MultiWriterIdGenerator(
|
|
conn,
|
|
self.db_pool,
|
|
stream_name="test_stream",
|
|
instance_name=instance_name,
|
|
tables=[
|
|
("foobar1", "instance_name", "stream_id"),
|
|
("foobar2", "instance_name", "stream_id"),
|
|
],
|
|
sequence_name="foobar_seq",
|
|
writers=writers or ["master"],
|
|
)
|
|
|
|
return self.get_success_or_raise(self.db_pool.runWithConnection(_create))
|
|
|
|
def _insert_rows(
|
|
self,
|
|
table: str,
|
|
instance_name: str,
|
|
number: int,
|
|
update_stream_table: bool = True,
|
|
):
|
|
"""Insert N rows as the given instance, inserting with stream IDs pulled
|
|
from the postgres sequence.
|
|
"""
|
|
|
|
def _insert(txn: LoggingTransaction) -> None:
|
|
for _ in range(number):
|
|
txn.execute(
|
|
"INSERT INTO %s VALUES (nextval('foobar_seq'), ?)" % (table,),
|
|
(instance_name,),
|
|
)
|
|
if update_stream_table:
|
|
txn.execute(
|
|
"""
|
|
INSERT INTO stream_positions VALUES ('test_stream', ?, lastval())
|
|
ON CONFLICT (stream_name, instance_name) DO UPDATE SET stream_id = lastval()
|
|
""",
|
|
(instance_name,),
|
|
)
|
|
|
|
self.get_success(self.db_pool.runInteraction("_insert_rows", _insert))
|
|
|
|
def test_load_existing_stream(self) -> None:
|
|
"""Test creating ID gens with multiple tables that have rows from after
|
|
the position in `stream_positions` table.
|
|
"""
|
|
self._insert_rows("foobar1", "first", 3)
|
|
self._insert_rows("foobar2", "second", 3)
|
|
self._insert_rows("foobar2", "second", 1, update_stream_table=False)
|
|
|
|
first_id_gen = self._create_id_generator("first", writers=["first", "second"])
|
|
second_id_gen = self._create_id_generator("second", writers=["first", "second"])
|
|
|
|
# The first ID gen will notice that it can advance its token to 7 as it
|
|
# has no in progress writes...
|
|
self.assertEqual(first_id_gen.get_positions(), {"first": 7, "second": 6})
|
|
self.assertEqual(first_id_gen.get_current_token_for_writer("first"), 7)
|
|
self.assertEqual(first_id_gen.get_current_token_for_writer("second"), 6)
|
|
self.assertEqual(first_id_gen.get_persisted_upto_position(), 7)
|
|
|
|
# ... but the second ID gen doesn't know that.
|
|
self.assertEqual(second_id_gen.get_positions(), {"first": 3, "second": 7})
|
|
self.assertEqual(second_id_gen.get_current_token_for_writer("first"), 3)
|
|
self.assertEqual(second_id_gen.get_current_token_for_writer("second"), 7)
|
|
self.assertEqual(first_id_gen.get_persisted_upto_position(), 7)
|