[Zope3-checkins] CVS: ZODB4/src/zodb/storage/tests - test_recover.py:1.1.2.1

[Jeremy Hylton]

Update of /cvs-repository/ZODB4/src/zodb/storage/tests
In directory cvs.zope.org:/tmp/cvs-serv18789/src/zodb/storage/tests

Added Files:
      Tag: ZODB3-2-merge
	test_recover.py 
Log Message:
Add lightly test copy of the fsrecover code from ZODB3.


=== Added File ZODB4/src/zodb/storage/tests/test_recover.py ===
##############################################################################
#
# Copyright (c) 2003 Zope Corporation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Tests of the file storage recovery script."""

import base64
import os
import random
import sys
import tempfile
import unittest
import StringIO

from zodb.db import DB
from zodb.storage.file import FileStorage
from zodb.storage.file.recover import recover
from zodb.storage.file.dump import Dumper

from persistence.dict import PersistentDict
from transaction import get_transaction

class RecoverTest(unittest.TestCase):

    level = 2

    path = None

    def setUp(self):
        self.path = tempfile.mktemp(suffix=".fs")
        self.storage = FileStorage(self.path)
        self.populate()
        self.dest = tempfile.mktemp(suffix=".fs")
        self.recovered = None

    def tearDown(self):
        self.storage.close()
        if self.recovered is not None:
            self.recovered.close()
        self.storage.cleanup()
##        removefs(self.dest)

    def populate(self):
        db = DB(self.storage)
        cn = db.open()
        rt = cn.root()

        # create a whole bunch of objects,
        # looks like a Data.fs > 1MB
        for i in range(50):
            d = rt[i] = PersistentDict()
            get_transaction().commit()
            for j in range(50):
                d[j] = "a" * j
            get_transaction().commit()

    def damage(self, num, size):
        self.storage.close()
        # Drop size null bytes into num random spots.
        for i in range(num):
            offset = random.randint(0, self.storage._pos - size)
            f = open(self.path, "a+b")
            f.seek(offset)
            f.write("\0" * size)
            f.close()

    ITERATIONS = 5

    def recover(self, source, dest):
        orig = sys.stdout
        try:
            sys.stdout = StringIO.StringIO()
            try:
                recover(self.path, self.dest,
                        verbose=0, partial=1, force=0, pack=1)
            except SystemExit:
                raise RuntimeError, "recover tried to exit"
        finally:
            sys.stdout = orig

    def testOneBlock(self):
        for i in range(self.ITERATIONS):
            self.damage(1, 1024)
            self.recover(self.path, self.dest)
            self.recovered = FileStorage(self.dest)
            self.recovered.close()
            os.remove(self.path)
            os.rename(self.dest, self.path)

    def testFourBlocks(self):
        for i in range(self.ITERATIONS):
            self.damage(4, 512)
            self.recover(self.path, self.dest)
            self.recovered = FileStorage(self.dest)
            self.recovered.close()
            os.remove(self.path)
            os.rename(self.dest, self.path)

    def testBigBlock(self):
        for i in range(self.ITERATIONS):
            self.damage(1, 32 * 1024)
            self.recover(self.path, self.dest)
            self.recovered = FileStorage(self.dest)
            self.recovered.close()
            os.remove(self.path)
            os.rename(self.dest, self.path)

    def testBadTransaction(self):
        # Find transaction headers and blast them.

        L = self.storage.undoLog()
        r = L[3]
        tid = base64.decodestring(r["id"] + "\n")
        pos1 = self.storage._txn_find(tid, 0)

        r = L[8]
        tid = base64.decodestring(r["id"] + "\n")
        pos2 = self.storage._txn_find(tid, 0)

        self.storage.close()

        # Overwrite the entire header.
        f = open(self.path, "a+b")
        f.seek(pos1 - 50)
        f.write("\0" * 100)
        f.close()
        self.recover(self.path, self.dest)
        self.recovered = FileStorage(self.dest)
        self.recovered.close()
        os.remove(self.path)
        os.rename(self.dest, self.path)

        # Overwrite part of the header.
        f = open(self.path, "a+b")
        f.seek(pos2 + 10)
        f.write("\0" * 100)
        f.close()
        self.recover(self.path, self.dest)
        self.recovered = FileStorage(self.dest)
        self.recovered.close()

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