# -*- coding: utf-8 -*-
# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.storage.database import DatabasePool
from synapse.storage.util.id_generators import MultiWriterIdGenerator
from tests.unittest import HomeserverTestCase
from tests.utils import USE_POSTGRES_FOR_TESTS
class MultiWriterIdGeneratorTestCase(HomeserverTestCase):
if not USE_POSTGRES_FOR_TESTS:
skip = "Requires Postgres"
def prepare(self, reactor, clock, hs):
self.store = hs.get_datastore()
self.db_pool = self.store.db_pool # type: DatabasePool
self.get_success(self.db_pool.runInteraction("_setup_db", self._setup_db))
def _setup_db(self, txn):
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") -> MultiWriterIdGenerator:
def _create(conn):
return MultiWriterIdGenerator(
conn,
self.db_pool,
instance_name=instance_name,
table="foobar",
instance_column="instance_name",
id_column="stream_id",
sequence_name="foobar_seq",
)
return self.get_success(self.db_pool.runWithConnection(_create))
def _insert_rows(self, instance_name: str, number: int):
"""Insert N rows as the given instance, inserting with stream IDs pulled
from the postgres sequence.
"""
def _insert(txn):
for _ in range(number):
txn.execute(
"INSERT INTO foobar VALUES (nextval('foobar_seq'), ?)",
(instance_name,),
)
self.get_success(self.db_pool.runInteraction("_insert_rows", _insert))
def _insert_row_with_id(self, instance_name: str, stream_id: int):
"""Insert one row as the given instance with given stream_id, updating
the postgres sequence position to match.
"""
def _insert(txn):
txn.execute(
"INSERT INTO foobar VALUES (?, ?)", (stream_id, instance_name,),
)
txn.execute("SELECT setval('foobar_seq', ?)", (stream_id,))
self.get_success(self.db_pool.runInteraction("_insert_row_with_id", _insert))
def test_empty(self):
"""Test an ID generator against an empty database gives sensible
current positions.
"""
id_gen = self._create_id_generator()
# The table is empty so we expect an empty map for positions
self.assertEqual(id_gen.get_positions(), {})
def test_single_instance(self):
"""Test that reads and writes from a single process are handled
correctly.
"""
# Prefill table with 7 rows written by 'master'
self._insert_rows("master", 7)
id_gen = self._create_id_generator()
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
# Try allocating a new ID gen and check that we only see position
# advanced after we leave the context manager.
async def _get_next_async():
with await id_gen.get_next() as stream_id:
self.assertEqual(stream_id, 8)
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
self.get_success(_get_next_async())
self.assertEqual(id_gen.get_positions(), {"master": 8})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 8)
def test_out_of_order_finish(self):
"""Test that IDs persisted out of order are correctly handled
"""
# Prefill table with 7 rows written by 'master'
self._insert_rows("master", 7)
id_gen = self._create_id_generator()
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
ctx1 = self.get_success(id_gen.get_next())
ctx2 = self.get_success(id_gen.get_next())
ctx3 = self.get_success(id_gen.get_next())
ctx4 = self.get_success(id_gen.get_next())
s1 = ctx1.__enter__()
s2 = ctx2.__enter__()
s3 = ctx3.__enter__()
s4 = ctx4.__enter__()
self.assertEqual(s1, 8)
self.assertEqual(s2, 9)
self.assertEqual(s3, 10)
self.assertEqual(s4, 11)
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
ctx2.__exit__(None, None, None)
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
ctx1.__exit__(None, None, None)
self.assertEqual(id_gen.get_positions(), {"master": 9})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 9)
ctx4.__exit__(None, None, None)
self.assertEqual(id_gen.get_positions(), {"master": 9})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 9)
ctx3.__exit__(None, None, None)
self.assertEqual(id_gen.get_positions(), {"master": 11})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 11)
def test_multi_instance(self):
"""Test that reads and writes from multiple processes are handled
correctly.
"""
self._insert_rows("first", 3)
self._insert_rows("second", 4)
first_id_gen = self._create_id_generator("first")
second_id_gen = self._create_id_generator("second")
self.assertEqual(first_id_gen.get_positions(), {"first": 3, "second": 7})
self.assertEqual(first_id_gen.get_current_token_for_writer("first"), 3)
self.assertEqual(first_id_gen.get_current_token_for_writer("second"), 7)
# Try allocating a new ID gen and check that we only see position
# advanced after we leave the context manager.
async def _get_next_async():
with await first_id_gen.get_next() as stream_id:
self.assertEqual(stream_id, 8)
self.assertEqual(
first_id_gen.get_positions(), {"first": 3, "second": 7}
)
self.get_success(_get_next_async())
self.assertEqual(first_id_gen.get_positions(), {"first": 8, "second": 7})
# However the ID gen on the second instance won't have seen the update
self.assertEqual(second_id_gen.get_positions(), {"first": 3, "second": 7})
# ... but calling `get_next` on the second instance should give a unique
# stream ID
async def _get_next_async():
with await second_id_gen.get_next() as stream_id:
self.assertEqual(stream_id, 9)
self.assertEqual(
second_id_gen.get_positions(), {"first": 3, "second": 7}
)
self.get_success(_get_next_async())
self.assertEqual(second_id_gen.get_positions(), {"first": 3, "second": 9})
# If the second ID gen gets told about the first, it correctly updates
second_id_gen.advance("first", 8)
self.assertEqual(second_id_gen.get_positions(), {"first": 8, "second": 9})
def test_get_next_txn(self):
"""Test that the `get_next_txn` function works correctly.
"""
# Prefill table with 7 rows written by 'master'
self._insert_rows("master", 7)
id_gen = self._create_id_generator()
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
# Try allocating a new ID gen and check that we only see position
# advanced after we leave the context manager.
def _get_next_txn(txn):
stream_id = id_gen.get_next_txn(txn)
self.assertEqual(stream_id, 8)
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
self.get_success(self.db_pool.runInteraction("test", _get_next_txn))
self.assertEqual(id_gen.get_positions(), {"master": 8})
self.assertEqual(id_gen.get_current_token_for_writer("master"), 8)
def test_get_persisted_upto_position(self):
"""Test that `get_persisted_upto_position` correctly tracks updates to
positions.
"""
# The following tests are a bit cheeky in that we notify about new
# positions via `advance` without *actually* advancing the postgres
# sequence.
self._insert_row_with_id("first", 3)
self._insert_row_with_id("second", 5)
id_gen = self._create_id_generator("first")
self.assertEqual(id_gen.get_positions(), {"first": 3, "second": 5})
# Min is 3 and there is a gap between 5, so we expect it to be 3.
self.assertEqual(id_gen.get_persisted_upto_position(), 3)
# We advance "first" straight to 6. Min is now 5 but there is no gap so
# we expect it to be 6
id_gen.advance("first", 6)
self.assertEqual(id_gen.get_persisted_upto_position(), 6)
# No gap, so we expect 7.
id_gen.advance("second", 7)
self.assertEqual(id_gen.get_persisted_upto_position(), 7)
# We haven't seen 8 yet, so we expect 7 still.
id_gen.advance("second", 9)
self.assertEqual(id_gen.get_persisted_upto_position(), 7)
# Now that we've seen 7, 8 and 9 we can got straight to 9.
id_gen.advance("first", 8)
self.assertEqual(id_gen.get_persisted_upto_position(), 9)
# Jump forward with gaps. The minimum is 11, even though we haven't seen
# 10 we know that everything before 11 must be persisted.
id_gen.advance("first", 11)
id_gen.advance("second", 15)
self.assertEqual(id_gen.get_persisted_upto_position(), 11)
def test_get_persisted_upto_position_get_next(self):
"""Test that `get_persisted_upto_position` correctly tracks updates to
positions when `get_next` is called.
"""
self._insert_row_with_id("first", 3)
self._insert_row_with_id("second", 5)
id_gen = self._create_id_generator("first")
self.assertEqual(id_gen.get_positions(), {"first": 3, "second": 5})
self.assertEqual(id_gen.get_persisted_upto_position(), 3)
with self.get_success(id_gen.get_next()) as stream_id:
self.assertEqual(stream_id, 6)
self.assertEqual(id_gen.get_persisted_upto_position(), 3)
self.assertEqual(id_gen.get_persisted_upto_position(), 6)
# We assume that so long as `get_next` does correctly advance the
# `persisted_upto_position` in this case, then it will be correct in the
# other cases that are tested above (since they'll hit the same code).
class BackwardsMultiWriterIdGeneratorTestCase(HomeserverTestCase):
"""Tests MultiWriterIdGenerator that produce *negative* stream IDs.
"""
if not USE_POSTGRES_FOR_TESTS:
skip = "Requires Postgres"
def prepare(self, reactor, clock, hs):
self.store = hs.get_datastore()
self.db_pool = self.store.db_pool # type: DatabasePool
self.get_success(self.db_pool.runInteraction("_setup_db", self._setup_db))
def _setup_db(self, txn):
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") -> MultiWriterIdGenerator:
def _create(conn):
return MultiWriterIdGenerator(
conn,
self.db_pool,
instance_name=instance_name,
table="foobar",
instance_column="instance_name",
id_column="stream_id",
sequence_name="foobar_seq",
positive=False,
)
return self.get_success(self.db_pool.runWithConnection(_create))
def _insert_row(self, instance_name: str, stream_id: int):
"""Insert one row as the given instance with given stream_id.
"""
def _insert(txn):
txn.execute(
"INSERT INTO foobar VALUES (?, ?)", (stream_id, instance_name,),
)
self.get_success(self.db_pool.runInteraction("_insert_row", _insert))
def test_single_instance(self):
"""Test that reads and writes from a single process are handled
correctly.
"""
id_gen = self._create_id_generator()
with self.get_success(id_gen.get_next()) as stream_id:
self._insert_row("master", stream_id)
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)
with self.get_success(id_gen.get_next_mult(3)) as stream_ids:
for stream_id in stream_ids:
self._insert_row("master", stream_id)
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):
"""Tests that having multiple instances that get advanced over
federation works corretly.
"""
id_gen_1 = self._create_id_generator("first")
id_gen_2 = self._create_id_generator("second")
with self.get_success(id_gen_1.get_next()) as stream_id:
self._insert_row("first", stream_id)
id_gen_2.advance("first", stream_id)
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)
with self.get_success(id_gen_2.get_next()) as stream_id:
self._insert_row("second", stream_id)
id_gen_1.advance("second", stream_id)
self.assertEqual(id_gen_1.get_positions(), {"first": -1, "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)