#!/usr/bin/env python
#
# Public Domain 2014-2018 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
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# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
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#
# test_backup05.py
#   Test that backups can be performed similar to MongoDB's fsyncLock.
#   We assume writes are not being performed, a checkpoint is done and
#   then we open a backup cursor to prevent log archiving and other file
#   manipulations.  Manually copy the directory and verify it.
#

import fnmatch, os, shutil, time
from suite_subprocess import suite_subprocess
from helper import copy_wiredtiger_home
import wiredtiger, wttest

class test_backup05(wttest.WiredTigerTestCase, suite_subprocess):
    uri = 'table:test_backup05'
    emptyuri = 'table:test_empty05'
    newuri = 'table:test_new05'
    create_params = 'key_format=i,value_format=i'
    freq = 5

    def check_manual_backup(self, i, olddir, newdir):
        ''' Simulate a manual backup from olddir and restart in newdir. '''
        self.session.checkpoint()
        cbkup = self.session.open_cursor('backup:', None, None)

        # With the connection still open, copy files to new directory.
        # Half the time use an unaligned copy.
        even = i % (self.freq * 2) == 0
        aligned = even or os.name == "nt"
        copy_wiredtiger_home(olddir, newdir, aligned)

        # Half the time try to rename a table and the other half try
        # to remove a table.  They should fail.
        if not even:
            self.assertRaises(wiredtiger.WiredTigerError,
                lambda: self.session.rename(
                self.emptyuri, self.newuri, None))
        else:
            self.assertRaises(wiredtiger.WiredTigerError,
                lambda: self.session.drop(self.emptyuri, None))

        # Now simulate fsyncUnlock by closing the backup cursor.
        cbkup.close()

        # Once the backup cursor is closed we should be able to perform
        # schema operations.  Test that and then reset the files to their
        # expected initial names.
        if not even:
            self.session.rename(self.emptyuri, self.newuri, None)
            self.session.drop(self.newuri, None)
            self.session.create(self.emptyuri, self.create_params)
        else:
            self.session.drop(self.emptyuri, None)
            self.session.create(self.emptyuri, self.create_params)

        # Open the new directory and verify
        conn = self.setUpConnectionOpen(newdir)
        session = self.setUpSessionOpen(conn)
        session.verify(self.uri)
        conn.close()

    def backup(self):
        '''Check manual fsyncLock backup strategy'''

        # Here's the strategy:
        #    - update the table
        #    - checkpoint the database
        #    - open a backup cursor
        #    - copy the database directory (live, simulating a crash)
        #      - use copy tree or non-aligned dd
        #    - verify in the copy
        #    - repeat
        #
        # If the metadata isn't flushed, eventually the metadata we copy will
        # be sufficiently out-of-sync with the data file that it won't verify.

        self.session.create(self.emptyuri, self.create_params)
        self.reopen_conn()

        self.session.create(self.uri, self.create_params)
        for i in range(100):
            c = self.session.open_cursor(self.uri)
            c[i] = i
            c.close()
            if i % self.freq == 0:
                self.check_manual_backup(i, ".", "RESTART")
            else:
                self.session.verify(self.uri)

    def test_backup(self):
        with self.expectedStdoutPattern('recreating metadata'):
            self.backup()

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