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+#!/usr/bin/env python
+#
+# Public Domain 2014-2015 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):
+ """
+ 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 = self.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()