#!/usr/bin/env python
#
# Public Domain 2014-2018 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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# test_reserve.py
#       Reserve update tests.

import wiredtiger, wttest
from wtdataset import SimpleDataSet, SimpleIndexDataSet
from wtdataset import SimpleLSMDataSet, ComplexDataSet, ComplexLSMDataSet
from wtscenario import make_scenarios

# Test WT_CURSOR.reserve.
class test_reserve(wttest.WiredTigerTestCase):

    keyfmt = [
        ('integer', dict(keyfmt='i')),
        ('recno', dict(keyfmt='r')),
        ('string', dict(keyfmt='S')),
    ]
    types = [
        ('file', dict(uri='file', ds=SimpleDataSet)),
        ('lsm', dict(uri='lsm', ds=SimpleDataSet)),
        ('table-complex', dict(uri='table', ds=ComplexDataSet)),
        ('table-complex-lsm', dict(uri='table', ds=ComplexLSMDataSet)),
        ('table-index', dict(uri='table', ds=SimpleIndexDataSet)),
        ('table-simple', dict(uri='table', ds=SimpleDataSet)),
        ('table-simple-lsm', dict(uri='table', ds=SimpleLSMDataSet)),
    ]
    scenarios = make_scenarios(types, keyfmt)

    def skip(self):
        return self.keyfmt == 'r' and \
            (self.ds.is_lsm() or self.uri == 'lsm')

    def test_reserve(self):
        if self.skip():
            return

        uri = self.uri + ':test_reserve'

        ds = self.ds(self, uri, 500, key_format=self.keyfmt)
        ds.populate()
        s = self.conn.open_session()
        c = s.open_cursor(uri, None)

        # Repeatedly update a record.
        for i in range(1, 5):
            s.begin_transaction('isolation=snapshot')
            c.set_key(ds.key(100))
            c.set_value(ds.value(100))
            self.assertEquals(c.update(), 0)
            s.commit_transaction()

        # Confirm reserve fails if the record doesn't exist.
        s.begin_transaction('isolation=snapshot')
        c.set_key(ds.key(600))
        self.assertRaises(wiredtiger.WiredTigerError, lambda:c.reserve())
        s.rollback_transaction()

        # Repeatedly reserve a record and commit.
        for i in range(1, 5):
            s.begin_transaction('isolation=snapshot')
            c.set_key(ds.key(100))
            self.assertEquals(c.reserve(), 0)
            s.commit_transaction()

        # Repeatedly reserve a record and rollback.
        for i in range(1, 5):
            s.begin_transaction('isolation=snapshot')
            c.set_key(ds.key(100))
            self.assertEquals(c.reserve(), 0)
            s.rollback_transaction()

        # Repeatedly reserve, then update, a record, and commit.
        for i in range(1, 5):
            s.begin_transaction('isolation=snapshot')
            c.set_key(ds.key(100))
            self.assertEquals(c.reserve(), 0)
            c.set_value(ds.value(100))
            self.assertEquals(c.update(), 0)
            s.commit_transaction()

        # Repeatedly reserve, then update, a record, and rollback.
        for i in range(1, 5):
            s.begin_transaction('isolation=snapshot')
            c.set_key(ds.key(100))
            self.assertEquals(c.reserve(), 0)
            c.set_value(ds.value(100))
            self.assertEquals(c.update(), 0)
            s.commit_transaction()

        # Reserve a slot, repeatedly try and update a record from another
        # transaction (which should fail), repeatedly update a record and
        # commit.
        s2 = self.conn.open_session()
        c2 = s2.open_cursor(uri, None)
        for i in range(1, 2):
            s.begin_transaction('isolation=snapshot')
            c.set_key(ds.key(100))
            self.assertEquals(c.reserve(), 0)

            s2.begin_transaction('isolation=snapshot')
            c2.set_key(ds.key(100))
            c2.set_value(ds.value(100))
            self.assertRaises(wiredtiger.WiredTigerError, lambda:c2.update())
            s2.rollback_transaction()

            c.set_key(ds.key(100))
            c.set_value(ds.value(100))
            self.assertEquals(c.update(), 0)
            s.commit_transaction()

    # Test cursor.reserve will fail if a key has not yet been set.
    def test_reserve_without_key(self):
        if self.skip():
            return

        uri = self.uri + ':test_reserve_without_key'

        ds = self.ds(self, uri, 10, key_format=self.keyfmt)
        ds.populate()
        s = self.conn.open_session()
        c = s.open_cursor(uri, None)
        s.begin_transaction('isolation=snapshot')
        msg = "/requires key be set/"
        self.assertRaisesWithMessage(
            wiredtiger.WiredTigerError, lambda:c.reserve(), msg)

    # Test cursor.reserve will fail if there's no running transaction.
    def test_reserve_without_txn(self):
        if self.skip():
            return

        uri = self.uri + ':test_reserve_without_txn'

        ds = self.ds(self, uri, 10, key_format=self.keyfmt)
        ds.populate()
        s = self.conn.open_session()
        c = s.open_cursor(uri, None)
        c.set_key(ds.key(5))
        msg = "/only permitted in a running transaction/"
        self.assertRaisesWithMessage(
            wiredtiger.WiredTigerError, lambda:c.reserve(), msg)

    # Test cursor.reserve returns a value on success.
    def test_reserve_returns_value(self):
        if self.skip():
            return

        uri = self.uri + ':test_reserve_returns_value'

        ds = self.ds(self, uri, 10, key_format=self.keyfmt)
        ds.populate()
        s = self.conn.open_session()
        c = s.open_cursor(uri, None)
        s.begin_transaction('isolation=snapshot')
        c.set_key(ds.key(5))
        self.assertEquals(c.reserve(), 0)
        self.assertEqual(c.get_value(), ds.comparable_value(5))

    # Test cursor.reserve fails on non-standard cursors.
    def test_reserve_not_supported(self):
        if self.skip():
            return

        uri = self.uri + ':test_reserve_not_supported'
        s = self.conn.open_session()
        s.create(uri, 'key_format=' + self.keyfmt + ",value_format=S")

        list = [ "bulk", "dump=json" ]
        for l in list:
                c = s.open_cursor(uri, None, l)
                msg = "/Operation not supported/"
                self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
                    lambda:self.assertEquals(c.reserve(), 0), msg)
                c.close()

        list = [ "backup:", "config:" "log:" "metadata:" "statistics:" ]
        for l in list:
                c = s.open_cursor(l, None, None)
                msg = "/Operation not supported/"
                self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
                    lambda:self.assertEquals(c.reserve(), 0), msg)

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