#!/usr/bin/env python
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# Public Domain 2008-2014 WiredTiger, Inc.
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import wiredtiger, wttest
def timestamp_str(t):
    return '%x' % t

# test_prepare12.py
# Test update restore of a page with prepared update.
class test_prepare12(wttest.WiredTigerTestCase):
    conn_config = 'cache_size=2MB,statistics=(all)'
    session_config = 'isolation=snapshot'

    def test_prepare_update_restore(self):
        uri = "table:test_prepare12"
        self.session.create(uri, 'key_format=i,value_format=S')

        # Prepare a transaction
        cursor = self.session.open_cursor(uri, None)
        self.session.begin_transaction()
        cursor[0] = 'a'
        self.session.prepare_transaction('prepare_timestamp=' + timestamp_str(1))

        # Insert an uncommitted key
        session2 = self.conn.open_session(None)
        cursor2 = session2.open_cursor(uri, None)
        session2.begin_transaction()
        cursor2[1] = 'b'

        # Insert a bunch of other content to fill the database to trigger eviction.
        session3 = self.conn.open_session(None)
        cursor3 = session3.open_cursor(uri, None)
        for i in range(2, 100):
            session3.begin_transaction()
            cursor3[i] = 'a' * 500
            session3.commit_transaction()

        # Commit the prepared update
        self.session.commit_transaction('commit_timestamp=' + timestamp_str(1) + ',durable_timestamp=' + timestamp_str(2))

        # Read the prepared update
        self.session.begin_transaction('read_timestamp=' + timestamp_str(2))
        self.assertEqual(cursor[0], 'a')