#!/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_bug022.py
#       Testing that we don't allow modifies on top of tombstone updates.

import wiredtiger, wttest

def timestamp_str(t):
    return '%x' % t

class test_bug022(wttest.WiredTigerTestCase):
    uri = 'file:test_bug022'
    conn_config = 'cache_size=50MB'
    session_config = 'isolation=snapshot'

    def test_apply_modifies_on_onpage_tombstone(self):
        self.session.create(self.uri, 'key_format=S,value_format=S')
        self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1))
        cursor = self.session.open_cursor(self.uri)

        value = 'a' * 500
        for i in range(1, 10000):
            self.session.begin_transaction()
            cursor[str(i)] = value
            self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))

        # Apply tombstones for every key.
        for i in range(1, 10000):
            self.session.begin_transaction()
            cursor.set_key(str(i))
            cursor.remove()
            self.session.commit_transaction('commit_timestamp=' + timestamp_str(3))

        self.session.checkpoint()

        # Now try to apply a modify on top of the tombstone at timestamp 3.
        for i in range(1, 10000):
            self.session.begin_transaction()
            cursor.set_key(str(i))
            self.assertEqual(cursor.modify([wiredtiger.Modify('B', 0, 100)]), wiredtiger.WT_NOTFOUND)
            self.session.rollback_transaction()

        # Check that the tombstone is visible.
        for i in range(1, 10000):
            cursor.set_key(str(i))
            self.assertEqual(cursor.search(), wiredtiger.WT_NOTFOUND)