def test_read_from_other_schema(self, mock_connect, __):
inst = Postgres(self.source, OPTIONS)
inst.tables = [
{'value': 'my_schema.foo_bar'},
{'value': 'your_schema.bar_foo'}
]
cursor_return_value = mock_connect.return_value.cursor.return_value
mock_data = [self.mock_recs[:1], []] * 2
cursor_return_value.fetchall.side_effect = mock_data
expected = [
('my_schema', 'foo_bar'),
(None, None),
('your_schema', 'bar_foo')
]
for expected_schema, expected_table in expected:
result = inst.read()
if result:
schema = result[0]['__schemaname']
table = result[0]['__tablename']
self.assertEqual(schema, expected_schema)
self.assertEqual(table, expected_table)
def test_recover_from_state(self, mock_connect, mock_execute):
"""continues to read a table from the saved state"""
tables = [
{
'value': 'public.test1'
},
{
'value': 'public.test2'
},
{
'value': 'public.test3'
},
]
last_index = 1
self.source['state'] = {'last_index': last_index}
inst = Postgres(self.source, OPTIONS)
inst.tables = tables
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.return_value = [{
'id': 101
}, {
'id': 102
}, {
'id': 103
}]
inst.read()
first_query = mock_execute.call_args_list[0][0][0]
self.assertTrue("\"id\" >= '1'" in first_query)
self.assertTrue('FROM "public"."test2"' in first_query)
def test_read_retries(self, mock_connect):
inst = Postgres(self.source, OPTIONS)
inst.tables = [{'value': 'my_schema.foo_bar'}]
mock_connect.side_effect = psycopg2.DatabaseError('TestRetriesError')
with self.assertRaises(psycopg2.DatabaseError):
inst.read()
self.assertEqual(mock_connect.call_count, MAX_RETRIES)
def test_invalid_inckey(self, mock_connect):
tables = [{'value': 'public.table1'}]
inst = Postgres(self.source, OPTIONS)
inst.tables = tables
mock_connector = mock.Mock()
mock_connector.cursor.execute.side_effect = \
psycopg2.errors.UndefinedColumn('column does not exist')
inst.connector = mock_connector
with self.assertRaises(PostgresInckeyError):
inst.read()
def test_incremental(self, mock_connect):
inst = Postgres(self.source, OPTIONS)
inst.tables = [{'value': 'schema.foo'}]
inst.read()
q = ('DECLARE cur CURSOR FOR '
'SELECT * FROM "schema"."foo" '
'WHERE "id" >= \'1\' ORDER BY "id"')
execute_mock = mock_connect.return_value.cursor.return_value.execute
execute_mock.assert_has_calls([mock.call(q)], True)
def test_use_inckey_as_index(self, mock_connect):
inst = Postgres(self.source, OPTIONS)
inst.tables = [{'value': 'my_schema.foo_bar'}]
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.return_value = [{'id': 1, 'col1': 1}]
inst.read()
expected = [self.source['inckey']]
result = inst.keys
self.assertEqual(result, expected)
def test_batch_size(self, mock_connect, mock_execute):
customBatchSize = 42
self.source['__batchSize'] = customBatchSize
inst = Postgres(self.source, OPTIONS)
inst.tables = [{'value': 'my_schema.foo_bar'}]
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.return_value = self.mock_recs
inst.read()
second_query = mock_execute.call_args_list[1][0][0]
txt = 'FETCH FORWARD {}'.format(customBatchSize)
self.assertTrue(second_query.startswith(txt))
def test_read(self, mock_connect):
"""reads a table from the database and validates that each row
has a __tablename, __schemaname and __databasename column"""
inst = Postgres(self.source, OPTIONS)
inst.tables = [{'value': 'my_schema.foo_bar'}]
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.return_value = self.mock_recs
rows = inst.read()
self.assertEqual(len(rows), len(self.mock_recs))
for x in range(0, len(rows)):
self.assertEqual(rows[x]['__tablename'], 'foo_bar')
self.assertEqual(rows[x]['__schemaname'], 'my_schema')
self.assertEqual(rows[x]['__databasename'], self.source['db_name'])
def test_no_state_for_empty_results(self, mock_connect, mock_state):
"""before returning a batch of data, the sources state should be
reported as well as having the state ID appended to each data object"""
inst = Postgres(self.source, OPTIONS)
table_name = 'my_schema.foo_bar'
inst.tables = [{'value': table_name}]
result_order = [[], []]
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.side_effect = result_order
inst.read()
# State function was called with relevant table name and row count
mock_state.assert_not_called()
def test_retry_cursor_from_last_value(self, mock_connect):
inst = Postgres(self.source, OPTIONS)
inst.tables = [{'value': 'my_schema.foo_bar'}]
inst.inckey = None
inst.incval = None
inst.keys = ['col1', 'col2']
records = [{
'id': 1,
'col1': 'foo1',
'col2': 'bar1'
}, {
'id': 2,
'col1': 'foo2',
'col2': 'bar2'
}, {
'id': 3,
'col1': 'foo3',
'col2': 'bar3'
}]
cursor_execute = mock_connect.return_value.cursor.return_value.execute
cursor_execute.side_effect = [
lambda *args: None, lambda *args: None,
psycopg2.DatabaseError('TestRetriesError'), lambda *args: None,
lambda *args: None
]
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.return_value = records
# First read no error
inst.read()
init_query = cursor_execute.call_args_list[0][0][0]
expected_init_query = 'DECLARE cur CURSOR FOR SELECT * FROM ' \
'"my_schema"."foo_bar" ORDER BY "col1", "col2"'
# Raise retry error and restart cursor
inst.read()
retried_query = cursor_execute.call_args_list[-2][0][0]
expected_retried_query = 'DECLARE cur CURSOR FOR SELECT * FROM ' \
'"my_schema"."foo_bar" WHERE ' \
'"col1" >= \'foo3\' AND "col2" >= \'bar3\' ' \
'ORDER BY "col1", "col2"'
self.assertEqual(init_query, expected_init_query)
self.assertEqual(retried_query, expected_retried_query)
def test_reports_state(self, mock_connect, mock_state):
"""before returning a batch of data, the sources state should be
reported as well as having the state ID appended to each data object"""
inst = Postgres(self.source, OPTIONS)
table_name = 'my_schema.foo_bar'
inst.tables = [{'value': table_name}]
result_order = [self.mock_recs, []]
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.side_effect = result_order
rows = inst.read()
state_id = rows[0]['__state']
state_obj = dict([
('last_index', 0),
])
msg = 'State ID is not the same in all rows!'
for row in rows:
self.assertEqual(row['__state'], state_id, msg)
# State function was called with relevant table name and row count
mock_state.assert_called_with(state_id, state_obj)
def test_read_end_stream(self, mock_connect, mock_execute):
"""reads the entire table from the database and validates that the
stream returns None to indicate the end"""
tables = [
{
'value': 'public.table1'
},
{
'value': 'public.table2'
},
{
'value': 'public.table3'
},
]
inst = Postgres(self.source, OPTIONS)
inst.tables = tables
result_order = [
self.mock_recs, [], self.mock_recs, [], self.mock_recs, []
]
cursor_return_value = mock_connect.return_value.cursor.return_value
cursor_return_value.fetchall.side_effect = result_order
# First call to read
result = inst.read()
self.assertEqual(len(result), len(self.mock_recs))
query = mock_execute.call_args_list[0][0][0]
expected_query = 'FROM "public"."table1" ' \
'WHERE "id" >= \'1\' ' \
'ORDER BY "id"'
self.assertTrue(expected_query in query)
query = mock_execute.call_args_list[1][0][0]
expected_query = 'FETCH FORWARD'
self.assertTrue(expected_query in query)
# Second call to read
result = inst.read()
self.assertEqual(result, [])
query = mock_execute.call_args_list[2][0][0]
expected_query = 'FETCH FORWARD'
self.assertTrue(expected_query in query)
# Third call to read
result = inst.read()
self.assertEqual(len(result), len(self.mock_recs))
query = mock_execute.call_args_list[3][0][0]
expected_query = 'FROM "public"."table2" ' \
'WHERE "id" >= \'1\' ' \
'ORDER BY "id"'
self.assertTrue(expected_query in query)
query = mock_execute.call_args_list[4][0][0]
expected_query = 'FETCH FORWARD'
self.assertTrue(expected_query in query)
# Fourth call to read
result = inst.read()
self.assertEqual(result, [])
query = mock_execute.call_args_list[5][0][0]
expected_query = 'FETCH FORWARD'
self.assertTrue(expected_query in query)
# Fifth call to read
result = inst.read()
self.assertEqual(len(result), len(self.mock_recs))
query = mock_execute.call_args_list[6][0][0]
expected_query = 'FROM "public"."table3" ' \
'WHERE "id" >= \'1\' ' \
'ORDER BY "id"'
self.assertTrue(expected_query in query)
query = mock_execute.call_args_list[7][0][0]
expected_query = 'FETCH FORWARD'
self.assertTrue(expected_query in query)
# Sixth call to read
result = inst.read()
self.assertEqual(result, [])
query = mock_execute.call_args_list[8][0][0]
expected_query = 'FETCH FORWARD'
self.assertTrue(expected_query in query)
end = inst.read()
self.assertEqual(end, None)