cpython/Lib/bsddb/test/test_recno.py

"""TestCases for exercising a Recno DB.
"""

import os
import errno
from pprint import pprint
import unittest

from test_all import db, test_support, verbose, get_new_environment_path, get_new_database_path

letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'


#----------------------------------------------------------------------

class SimpleRecnoTestCase(unittest.TestCase):
    import sys
    if sys.version_info[:3] < (2, 4, 0):
        def assertFalse(self, expr, msg=None):
            self.failIf(expr,msg=msg)

    def setUp(self):
        self.filename = get_new_database_path()
        self.homeDir = None

    def tearDown(self):
        test_support.unlink(self.filename)
        if self.homeDir:
            test_support.rmtree(self.homeDir)

    def test01_basic(self):
        d = db.DB()

        get_returns_none = d.set_get_returns_none(2)
        d.set_get_returns_none(get_returns_none)

        d.open(self.filename, db.DB_RECNO, db.DB_CREATE)

        for x in letters:
            recno = d.append(x * 60)
            self.assertIsInstance(recno, int)
            self.assertGreaterEqual(recno, 1)
            if verbose:
                print recno,

        if verbose: print

        stat = d.stat()
        if verbose:
            pprint(stat)

        for recno in range(1, len(d)+1):
            data = d[recno]
            if verbose:
                print data

            self.assertIsInstance(data, str)
            self.assertEqual(data, d.get(recno))

        try:
            data = d[0]  # This should raise a KeyError!?!?!
        except db.DBInvalidArgError, val:
            self.assertEqual(val.args[0], db.EINVAL)
            if verbose: print val
        else:
            self.fail("expected exception")

        # test that has_key raises DB exceptions (fixed in pybsddb 4.3.2)
        try:
            d.has_key(0)
        except db.DBError, val:
            pass
        else:
            self.fail("has_key did not raise a proper exception")

        try:
            data = d[100]
        except KeyError:
            pass
        else:
            self.fail("expected exception")

        try:
            data = d.get(100)
        except db.DBNotFoundError, val:
            if get_returns_none:
                self.fail("unexpected exception")
        else:
            self.assertEqual(data, None)

        keys = d.keys()
        if verbose:
            print keys
        self.assertIsInstance(keys, list)
        self.assertIsInstance(keys[0], int)
        self.assertEqual(len(keys), len(d))

        items = d.items()
        if verbose:
            pprint(items)
        self.assertIsInstance(items, list)
        self.assertIsInstance(items[0], tuple)
        self.assertEqual(len(items[0]), 2)
        self.assertIsInstance(items[0][0], int)
        self.assertIsInstance(items[0][1], str)
        self.assertEqual(len(items), len(d))

        self.assertTrue(d.has_key(25))

        del d[25]
        self.assertFalse(d.has_key(25))

        d.delete(13)
        self.assertFalse(d.has_key(13))

        data = d.get_both(26, "z" * 60)
        self.assertEqual(data, "z" * 60, 'was %r' % data)
        if verbose:
            print data

        fd = d.fd()
        if verbose:
            print fd

        c = d.cursor()
        rec = c.first()
        while rec:
            if verbose:
                print rec
            rec = c.next()

        c.set(50)
        rec = c.current()
        if verbose:
            print rec

        c.put(-1, "a replacement record", db.DB_CURRENT)

        c.set(50)
        rec = c.current()
        self.assertEqual(rec, (50, "a replacement record"))
        if verbose:
            print rec

        rec = c.set_range(30)
        if verbose:
            print rec

        # test that non-existent key lookups work (and that
        # DBC_set_range doesn't have a memleak under valgrind)
        rec = c.set_range(999999)
        self.assertEqual(rec, None)
        if verbose:
            print rec

        c.close()
        d.close()

        d = db.DB()
        d.open(self.filename)
        c = d.cursor()

        # put a record beyond the consecutive end of the recno's
        d[100] = "way out there"
        self.assertEqual(d[100], "way out there")

        try:
            data = d[99]
        except KeyError:
            pass
        else:
            self.fail("expected exception")

        try:
            d.get(99)
        except db.DBKeyEmptyError, val:
            if get_returns_none:
                self.fail("unexpected DBKeyEmptyError exception")
            else:
                self.assertEqual(val.args[0], db.DB_KEYEMPTY)
                if verbose: print val
        else:
            if not get_returns_none:
                self.fail("expected exception")

        rec = c.set(40)
        while rec:
            if verbose:
                print rec
            rec = c.next()

        c.close()
        d.close()

    def test02_WithSource(self):
        """
        A Recno file that is given a "backing source file" is essentially a
        simple ASCII file.  Normally each record is delimited by \n and so is
        just a line in the file, but you can set a different record delimiter
        if needed.
        """
        homeDir = get_new_environment_path()
        self.homeDir = homeDir
        source = os.path.join(homeDir, 'test_recno.txt')
        if not os.path.isdir(homeDir):
            os.mkdir(homeDir)
        f = open(source, 'w') # create the file
        f.close()

        d = db.DB()
        # This is the default value, just checking if both int
        d.set_re_delim(0x0A)
        d.set_re_delim('\n')  # and char can be used...
        d.set_re_source(source)
        d.open(self.filename, db.DB_RECNO, db.DB_CREATE)

        data = "The quick brown fox jumped over the lazy dog".split()
        for datum in data:
            d.append(datum)
        d.sync()
        d.close()

        # get the text from the backing source
        text = open(source, 'r').read()
        text = text.strip()
        if verbose:
            print text
            print data
            print text.split('\n')

        self.assertEqual(text.split('\n'), data)

        # open as a DB again
        d = db.DB()
        d.set_re_source(source)
        d.open(self.filename, db.DB_RECNO)

        d[3] = 'reddish-brown'
        d[8] = 'comatose'

        d.sync()
        d.close()

        text = open(source, 'r').read()
        text = text.strip()
        if verbose:
            print text
            print text.split('\n')

        self.assertEqual(text.split('\n'),
           "The quick reddish-brown fox jumped over the comatose dog".split())

    def test03_FixedLength(self):
        d = db.DB()
        d.set_re_len(40)  # fixed length records, 40 bytes long
        d.set_re_pad('-') # sets the pad character...
        d.set_re_pad(45)  # ...test both int and char
        d.open(self.filename, db.DB_RECNO, db.DB_CREATE)

        for x in letters:
            d.append(x * 35)    # These will be padded

        d.append('.' * 40)      # this one will be exact

        try:                    # this one will fail
            d.append('bad' * 20)
        except db.DBInvalidArgError, val:
            self.assertEqual(val.args[0], db.EINVAL)
            if verbose: print val
        else:
            self.fail("expected exception")

        c = d.cursor()
        rec = c.first()
        while rec:
            if verbose:
                print rec
            rec = c.next()

        c.close()
        d.close()


#----------------------------------------------------------------------


def test_suite():
    return unittest.makeSuite(SimpleRecnoTestCase)


if __name__ == '__main__':
    unittest.main(defaultTest='test_suite')