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108 lines
2.8 KiB
Python
108 lines
2.8 KiB
Python
"""
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Tests for function providing a non-blocking query interface towards PostgreSQL.
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"""
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from contextlib import closing
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import concurrent.futures
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import pytest
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import psycopg2
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from nominatim.db.async_connection import DBConnection, DeadlockHandler
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@pytest.fixture
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def conn(temp_db):
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with closing(DBConnection('dbname=' + temp_db)) as connection:
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yield connection
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@pytest.fixture
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def simple_conns(temp_db):
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conn1 = psycopg2.connect('dbname=' + temp_db)
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conn2 = psycopg2.connect('dbname=' + temp_db)
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yield conn1.cursor(), conn2.cursor()
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conn1.close()
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conn2.close()
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def test_simple_query(conn, temp_db_conn):
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conn.connect()
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conn.perform('CREATE TABLE foo (id INT)')
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conn.wait()
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temp_db_conn.table_exists('foo')
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def test_wait_for_query(conn):
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conn.connect()
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conn.perform('SELECT pg_sleep(1)')
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assert not conn.is_done()
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conn.wait()
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def test_bad_query(conn):
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conn.connect()
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conn.perform('SELECT efasfjsea')
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with pytest.raises(psycopg2.ProgrammingError):
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conn.wait()
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def test_bad_query_ignore(temp_db):
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with closing(DBConnection('dbname=' + temp_db, ignore_sql_errors=True)) as conn:
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conn.connect()
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conn.perform('SELECT efasfjsea')
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conn.wait()
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def exec_with_deadlock(cur, sql, detector):
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with DeadlockHandler(lambda *args: detector.append(1)):
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cur.execute(sql)
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def test_deadlock(simple_conns):
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cur1, cur2 = simple_conns
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cur1.execute("""CREATE TABLE t1 (id INT PRIMARY KEY, t TEXT);
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INSERT into t1 VALUES (1, 'a'), (2, 'b')""")
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cur1.connection.commit()
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cur1.execute("UPDATE t1 SET t = 'x' WHERE id = 1")
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cur2.execute("UPDATE t1 SET t = 'x' WHERE id = 2")
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# This is the tricky part of the test. The first SQL command runs into
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# a lock and blocks, so we have to run it in a separate thread. When the
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# second deadlocking SQL statement is issued, Postgresql will abort one of
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# the two transactions that cause the deadlock. There is no way to tell
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# which one of the two. Therefore wrap both in a DeadlockHandler and
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# expect that exactly one of the two triggers.
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with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
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deadlock_check = []
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try:
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future = executor.submit(exec_with_deadlock, cur2,
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"UPDATE t1 SET t = 'y' WHERE id = 1",
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deadlock_check)
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while not future.running():
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pass
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exec_with_deadlock(cur1, "UPDATE t1 SET t = 'y' WHERE id = 2",
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deadlock_check)
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finally:
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# Whatever happens, make sure the deadlock gets resolved.
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cur1.connection.rollback()
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future.result()
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assert len(deadlock_check) == 1
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