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Added/Updated tests\functional\tabloid\test_90129c6d.py: Checked on 6.0.0.396, 5.0.1.1440. See notes.
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pavel-zotov
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2151187823
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tests/functional/tabloid/test_90129c6d.py
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164
tests/functional/tabloid/test_90129c6d.py
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#coding:utf-8
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"""
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ID: issue-90129c6d
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ISSUE: https://github.com/FirebirdSQL/firebird/commit/90129c6d3ebd5d1c9a7b44d287a4791dffcd031e
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TITLE: Scrollable cursors. Fixed isBof/isEof when the prefetch is active
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DESCRIPTION:
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is_bof()/is_eof() could became True much earlier than actual position of cursor did come to BOF/EOF.
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This occurred on fetch_prior() / fetch_next() calls and caused wrong result for counting number of
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processed rows.
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Discussed with dimitr, see letters with subj = "firebird-driver & scrollable cursors".
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Dates: 27.11.2021 21:20, 28.11.2021 19:00, 29.11.2021 07:40
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NOTES:
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[19.07.2024] pzotov
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1. No ticket has been created for described problem.
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Problem was fixed 28.11.2021 at 16:09, commit #90129c6d.
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Confirmed bug on 5.0.0.321 (28.11.2021). Fixed in 5.0.0.324 (29.11.2021).
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2. Initial test contained too big values for check:
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N_ROWS = 10000
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N_WIDTH = 32765
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LOOP_COUNT = 1000
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They can be safely replaced with minimal possible values in order to see difference before and after fix.
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3. NOTE that argument passed to cur.stream_blobs.append() must be equal to the name of blob column as it is
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stored in RDB$ tables, i.e. in uppercase. Because of that, variable 'BLOB_FLD_NAME' is used instead of
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repeating blob column name in DDL and cur.stream_blobs.append().
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4. Custom driver-config object must be used for DPB because two values of WireCrypt parameter must be checked:
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Enabled and Disabled (see 'w_crypt').
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Checked on 6.0.0.396, 5.0.1.1440.
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"""
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import pytest
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from firebird.qa import *
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from firebird.driver import driver_config, connect, NetProtocol
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import time
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db = db_factory()
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act = python_act('db')
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N_ROWS = 1
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N_WIDTH = 1
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LOOP_COUNT = 2
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BLOB_FLD_NAME = 'BINARY_DATA'
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@pytest.mark.version('>=5.0')
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def test_1(act: Action, capsys):
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srv_cfg = driver_config.register_server(name = 'test_90129c6d_srv', config = '')
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for w_crypt in ('Enabled', 'Disabled'):
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db_cfg_name = f'test_90129c6d_wcrypt_{w_crypt}'
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db_cfg_object = driver_config.register_database(name = db_cfg_name)
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db_cfg_object.server.value = srv_cfg.name
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db_cfg_object.protocol.value = NetProtocol.INET
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db_cfg_object.database.value = str(act.db.db_path)
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db_cfg_object.config.value = f"""
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WireCrypt = w_crypt
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"""
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for suitable_for_compression in (0,1):
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if suitable_for_compression:
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data_dml = f"""
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execute block as
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declare n int = {N_ROWS};
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begin
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while ( n > 0 ) do
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begin
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insert into ts(id,{BLOB_FLD_NAME}) values(:n, lpad('', {N_WIDTH}, 'A'));
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n = n - 1;
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end
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end
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"""
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else:
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data_dml = f"""
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execute block as
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declare n int = {N_ROWS};
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declare n_wid int = {N_WIDTH};
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declare encrypted_text varchar({N_WIDTH}) character set octets;
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declare encr_addition varchar(16) character set octets;
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begin
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while (n > 0) do
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begin
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encrypted_text = '';
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encr_addition = '';
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while ( 1 = 1 ) do
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begin
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encr_addition = gen_uuid();
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if ( octet_length(encrypted_text) < n_wid - octet_length(encr_addition) ) then
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encrypted_text = encrypted_text || trim(encr_addition);
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else
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begin
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encrypted_text = encrypted_text || left(encr_addition, n_wid - octet_length(encrypted_text));
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leave;
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end
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end
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insert into ts(id,{BLOB_FLD_NAME}) values(:n, :encrypted_text);
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n = n - 1;
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end
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end
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"""
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init_sql = f"""
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recreate table ts(id int primary key, {BLOB_FLD_NAME} blob)
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^
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commit
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^
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{data_dml}
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^
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commit
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^
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"""
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with act.db.connect() as con:
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cur = con.cursor()
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for x in init_sql.split("^"):
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s = x.lower().strip()
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if s == "commit":
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con.commit()
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elif s:
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cur.execute(s)
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with connect(db_cfg_name, user = act.db.user, password = act.db.password) as con:
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assert (True if w_crypt else False) == con.info.is_encrypted(), f'Value of {con.info.is_encrypted()=} not equals to required: {w_crypt=}'
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cur = con.cursor()
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cur.stream_blobs.append(BLOB_FLD_NAME.upper())
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cur.open(f'select id, {BLOB_FLD_NAME} from ts order by id')
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for iter_no in range(LOOP_COUNT):
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cnt_fwrd=0
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while True:
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fetched_row_data = cur.fetch_next()
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if cur.is_eof():
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break
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v_id, v_blob_data = fetched_row_data
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with v_blob_data:
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v_blob_data.read()
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cnt_fwrd += 1
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cnt_back=0
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while True:
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fetched_row_data = cur.fetch_prior()
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if cur.is_bof():
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break
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v_id, v_blob_data = fetched_row_data
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with v_blob_data:
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v_blob_data.read()
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cnt_back += 1
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print(f'{w_crypt=}, {suitable_for_compression=}, {iter_no=}: {cnt_fwrd=}, {cnt_back=}')
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act.expected_stdout = """
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w_crypt='Enabled', suitable_for_compression=0, iter_no=0: cnt_fwrd=1, cnt_back=1
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w_crypt='Enabled', suitable_for_compression=0, iter_no=1: cnt_fwrd=1, cnt_back=1
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w_crypt='Enabled', suitable_for_compression=1, iter_no=0: cnt_fwrd=1, cnt_back=1
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w_crypt='Enabled', suitable_for_compression=1, iter_no=1: cnt_fwrd=1, cnt_back=1
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w_crypt='Disabled', suitable_for_compression=0, iter_no=0: cnt_fwrd=1, cnt_back=1
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w_crypt='Disabled', suitable_for_compression=0, iter_no=1: cnt_fwrd=1, cnt_back=1
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w_crypt='Disabled', suitable_for_compression=1, iter_no=0: cnt_fwrd=1, cnt_back=1
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w_crypt='Disabled', suitable_for_compression=1, iter_no=1: cnt_fwrd=1, cnt_back=1
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"""
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act.stdout = capsys.readouterr().out
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assert act.clean_stdout == act.clean_expected_stdout
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