#!/usr/bin/env python
#
# Public Domain 2014-2016 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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import wiredtiger, wttest
from wtdataset import SimpleDataSet
from helper import copy_wiredtiger_home

# test_bug014.py
#    JIRA WT-2115: fast-delete pages can be incorrectly lost due to a crash.
class test_bug014(wttest.WiredTigerTestCase):
    def test_bug014(self):
        # Populate a table with 1000 keys on small pages.
        uri = 'table:test_bug014'
        ds = SimpleDataSet(self, uri, 1000,
                           config='allocation_size=512,leaf_page_max=512')
        ds.populate()

        # Reopen it so we can fast-delete pages.
        self.reopen_conn()

        # Truncate a chunk of the key/value pairs inside a transaction.
        self.session.begin_transaction(None)
        start = self.session.open_cursor(uri, None)
        start.set_key(ds.key(250))
        end = self.session.open_cursor(uri, None)
        end.set_key(ds.key(500))
        self.session.truncate(None, start, end, None)
        start.close()
        end.close()

        # With the truncation uncommitted, checkpoint the database.
        ckpt_session = self.conn.open_session()
        ckpt_session.checkpoint(None)
        ckpt_session.close()

        # Simulate a crash by copying to a new directory.
        copy_wiredtiger_home(".", "RESTART")

        # Open the new directory.
        conn = self.setUpConnectionOpen("RESTART")
        session = self.setUpSessionOpen(conn)
        cursor = session.open_cursor(uri)

        # Confirm all of the records are there.
        for i in range(1, 1001):
            cursor.set_key(ds.key(i))
            self.assertEqual(cursor.search(), 0)

        conn.close()

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