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#!/usr/bin/env python
#
# Public Domain 2014-2016 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
import os, struct
from suite_subprocess import suite_subprocess
import wiredtiger, wttest
# test_salvage.py
# Utilities: wt salvage
class test_salvage(wttest.WiredTigerTestCase, suite_subprocess):
tablename = 'test_salvage.a'
nentries = 1000
session_params = 'key_format=S,value_format=S'
unique = 'SomeUniqueString'
def populate(self, tablename):
"""
Insert some simple entries into the table
"""
cursor = self.session.open_cursor('table:' + tablename, None, None)
key = ''
for i in range(0, self.nentries):
key += str(i)
if i == self.nentries / 2:
val = self.unique + '0'
else:
val = key + key
cursor[key] = val
cursor.close()
def check_populate(self, tablename):
"""
Verify that items added by populate are still there
"""
cursor = self.session.open_cursor('table:' + tablename, None, None)
wantkey = ''
i = 0
for gotkey, gotval in cursor:
wantkey += str(i)
if i == self.nentries / 2:
wantval = self.unique + '0'
else:
wantval = wantkey + wantkey
self.assertEqual(gotkey, wantkey)
self.assertTrue(gotval, wantval)
i += 1
self.assertEqual(i, self.nentries)
cursor.close()
def check_damaged(self, tablename):
"""
Check a damaged table with a lower standard than check_populate.
We don't require that all entries are here,
just that the ones that are here are correct.
"""
cursor = self.session.open_cursor('table:' + tablename, None, None)
wantkey = ''
i = -1
correct = 0
for gotkey, gotval in cursor:
i += 1
wantkey += str(i)
if gotkey != wantkey:
continue
if i == self.nentries / 2:
wantval = self.unique + '0'
else:
wantval = wantkey + wantkey
self.assertEqual(gotkey, wantkey)
self.assertTrue(gotval, wantval)
correct += 1
self.assertTrue(correct > 0)
self.printVerbose(2, 'after salvaging, file has ' + str(correct) + '/' +
str(self.nentries) + ' entries')
cursor.close()
def check_empty_table(self, tablename):
cursor = self.session.open_cursor('table:' + tablename, None, None)
for gotkey, gotval in cursor:
self.fail(tablename + ': has unexpected entries')
cursor.close()
def damage(self, tablename):
self.damage_inner(tablename, self.unique)
def damage_inner(self, tablename, unique):
"""
Open the file for the table, find the unique string
and modify it.
"""
self.close_conn()
# we close the connection to guarantee everything is
# flushed and closed from the WT point of view.
filename = tablename + ".wt"
fp = open(filename, "r+b")
found = matchpos = 0
match = unique
matchlen = len(match)
flen = os.fstat(fp.fileno()).st_size
c = fp.read(1)
while fp.tell() != flen:
if match[matchpos] == c:
matchpos += 1
if matchpos == matchlen:
# We're already positioned, so alter it
fp.seek(-1, 1)
fp.write('G')
matchpos = 0
found = 1
else:
matchpos = 0
c = fp.read(1)
# Make sure we found the embedded string
self.assertTrue(found)
fp.close()
def test_salvage_process_empty(self):
"""
Test salvage in a 'wt' process, using an empty table
"""
self.session.create('table:' + self.tablename, self.session_params)
errfile = "salvageerr.out"
self.runWt(["salvage", self.tablename + ".wt"], errfilename=errfile)
self.check_empty_file(errfile)
self.check_empty_table(self.tablename)
def test_salvage_process(self):
"""
Test salvage in a 'wt' process, using a populated table.
"""
self.session.create('table:' + self.tablename, self.session_params)
self.populate(self.tablename)
errfile = "salvageerr.out"
self.runWt(["salvage", self.tablename + ".wt"], errfilename=errfile)
self.check_empty_file(errfile)
self.check_populate(self.tablename)
def test_salvage_api_empty(self):
"""
Test salvage via API, using an empty table
"""
self.session.create('table:' + self.tablename, self.session_params)
self.session.salvage('table:' + self.tablename, None)
self.check_empty_table(self.tablename)
def test_salvage_api(self):
"""
Test salvage via API, using a populated table.
"""
self.session.create('table:' + self.tablename, self.session_params)
self.populate(self.tablename)
self.session.salvage('file:' + self.tablename + ".wt", None)
self.check_populate(self.tablename)
def test_salvage_api_damaged(self):
"""
Test salvage via API, on a damaged table.
"""
self.session.create('table:' + self.tablename, self.session_params)
self.populate(self.tablename)
self.damage(self.tablename)
# damage() closed the session/connection, reopen them now.
self.open_conn()
self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
lambda: self.session.verify('table:' + self.tablename, None),
"/read checksum error/")
self.session.salvage('file:' + self.tablename + ".wt", None)
self.check_damaged(self.tablename)
def test_salvage_process_damaged(self):
"""
Test salvage in a 'wt' process on a table that is purposely damaged.
"""
self.session.create('table:' + self.tablename, self.session_params)
self.populate(self.tablename)
self.damage(self.tablename)
errfile = "salvageerr.out"
self.runWt(["salvage", self.tablename + ".wt"], errfilename=errfile)
self.check_empty_file(errfile) # expect no output
self.check_no_error_in_file(errfile)
self.check_damaged(self.tablename)
if __name__ == '__main__':
wttest.run()
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