#!/usr/bin/env python
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# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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# test_prepare13.py
#   Fast-truncate fails when a page contains prepared updates.
import wiredtiger, wttest
from wtdataset import simple_key, simple_value

def timestamp_str(t):
    return '%x' % t
class test_prepare13(wttest.WiredTigerTestCase):
    # Force a small cache.
    conn_config = 'cache_size=10MB,statistics=(all),statistics_log=(json,on_close,wait=1)'

    def test_prepare(self):
        nrows = 20000
        # Pin oldest and stable to timestamp 1.
        self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1) +
            ',stable_timestamp=' + timestamp_str(1))

        # Create a large table with lots of pages.
        uri = "table:test_prepare13"
        config = 'allocation_size=512,leaf_page_max=512,key_format=S,value_format=S'
        self.session.create(uri, config)
        cursor = self.session.open_cursor(uri)
        for i in range(1, nrows):
            cursor[simple_key(cursor, i)] = simple_value(cursor, i)
        cursor.close()

        # Prepare a record.
        self.session.begin_transaction()
        cursor = self.session.open_cursor(uri)
        cursor[simple_key(cursor, 1000)] = "replacement_value"
        cursor.close()
        self.session.prepare_transaction('prepare_timestamp=' + timestamp_str(10))

        try:
            # Pin oldest and stable to timestamp 10.
            self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(10) +
                ',stable_timestamp=' + timestamp_str(10))

            # Open a separate session and cursor and perform updates to let prepared update to evict.
            s = self.conn.open_session()
            cursor = s.open_cursor(uri, None)
            for i in range(2000, nrows):
                s.begin_transaction()
                cursor[simple_key(cursor, i)] = simple_value(cursor, i)
                s.commit_transaction('commit_timestamp=' + timestamp_str(20))
            cursor.close()

            # Truncate the middle chunk and expect a conflict.
            preparemsg = '/conflict with a prepared update/'
            s.begin_transaction()
            c1 = s.open_cursor(uri, None)
            c1.set_key(simple_key(c1, 100))
            c2 = s.open_cursor(uri, None)
            c2.set_key(simple_key(c1, nrows))
            self.assertRaisesException(wiredtiger.WiredTigerError, lambda:s.truncate(None, c1, c2, None), preparemsg)
            c1.close()
            c2.close()
            s.rollback_transaction()

        finally:
            self.session.timestamp_transaction('commit_timestamp=' + timestamp_str(50))
            self.session.timestamp_transaction('durable_timestamp=' + timestamp_str(50))
            self.session.commit_transaction()

        s.close()

if __name__ == '__main__':
    wttest.run()