def _test_path_option(self, option):
     self.assertRaises(ValueError, setattr, self.cnf, option, '/not/exists')
     setattr(self.cnf, option, '/tmp')
     c = Configuration('mongodb')
     c.read(self.cnf_path)
     self.assertEqual('/tmp', c.get(option))
     self.assertEqual('/tmp', getattr(self.cnf, option))

class Cassandra(object):

	def __init__(self):
		self._logger = logging.getLogger(__name__)
		self._initd = initdv2.lookup(SERVICE_NAME)		
		
		bus.on(reload=self.on_reload)
		self.on_reload()
		
	def on_reload(self):
		self.queryenv = bus.queryenv_service
		self.platform = bus.platform
		self.private_ip = self.platform.get_private_ip()
		self.zone = self.platform.get_avail_zone()
		
		cnf = bus.cnf 
		self.ini = cnf.rawini
		
		self.role_name = self.ini.get(config.SECT_GENERAL, config.OPT_ROLE_NAME)

		self.storage_path = self.ini.get(CNF_SECTION, OPT_STORAGE_PATH)
		self.storage_conf_path = self.ini.get(CNF_SECTION, OPT_STORAGE_CNF_PATH)

		self.data_file_directory = self.storage_path + "/datafile"
		self.commit_log_directory = self.storage_path + "/commitlog"
		
		self.cassandra_conf = Configuration('xml')
		try:
			self.cassandra_conf.read(self.storage_conf_path)
		except (OSError, MetaconfError, ParseError), e:
			self._logger.error('Cassandra storage-conf.xml is broken. %s' % e)

	def get_system_variables(self):
		#TESTING REQUIRED!
		conf = Configuration(self._config_format)
		conf.read(self._config_path)
		vars = {}
		for section in conf.sections('./'):
			vars[section] = conf.get(section)
		return vars

 def __init__(self, body):
     config = Configuration("apache")
     try:
         config.reads(str(body))
     except ParseError, e:
         LOG.error("MetaConf failed to parse Apache VirtualHost body: \n%s" % body)
         e._err = body + "\n" + e._err
         raise

    def _update_main_config(self, remove_server_section=True, reload_service=True):
        config_dir = os.path.dirname(self.api.app_inc_path)
        nginx_conf_path = os.path.join(config_dir, 'nginx.conf')

        config = None
        try:
            config = Configuration('nginx')
            config.read(nginx_conf_path)
        except (Exception, BaseException), e:
            raise HandlerError('Cannot read/parse nginx main configuration file: %s' % str(e))

    def _https_config_exists(self):
        config_dir = os.path.dirname(self.api.app_inc_path)
        conf_path = os.path.join(config_dir, 'https.include')

        config = None
        try:
            config = Configuration('nginx')
            config.read(conf_path)
        except (Exception, BaseException), e:
            raise HandlerError('Cannot read/parse nginx main configuration file: %s' % str(e))

    def _main_config_contains_server(self):
        config_dir = os.path.dirname(self.api.app_inc_path)
        nginx_conf_path = os.path.join(config_dir, 'nginx.conf')

        config = None
        result = False
        try:
            config = Configuration('nginx')
            config.read(nginx_conf_path)
        except (Exception, BaseException), e:
            raise HandlerError('Cannot read/parse nginx main configuration file: %s' % str(e))

	def load(self, preset_type):
		'''
		@rtype: Preset
		@raise OSError: When cannot read preset file
		@raise MetaconfError: When experience problems with preset file parsing
		'''
		self._logger.debug('Loading %s %s preset' % (preset_type, self.service_name))
		ini = Configuration('ini')
		ini.read(self._filename(preset_type))
		
		return CnfPreset(ini.get('general/name'), dict(ini.items('settings/'))) 

	def __init__(self, manifest_path):
		self._options = []
		ini = Configuration('ini')
		ini.read(manifest_path)
		try:
			self._defaults = dict(ini.items('__defaults__'))
		except NoPathError:
			self._defaults = dict()
		
		for name in ini.sections("./"):
			if name == '__defaults__':
				continue
			self._options.append(_OptionSpec.from_ini(ini, name, self._defaults))

class ApacheConfigManager(object):

    _cnf = None
    path = None

    def __init__(self, path):
        self._cnf = Configuration("apache")
        self.path = path

    def __enter__(self):
        self._cnf.read(self.path)
        return self._cnf

    def __exit__(self, type, value, traceback):
        self._cnf.write(self.path)

    def download_and_restore(self, volume, snapshot, tranzit_path):
        # Load manifest
        clear_queue(self._writer_queue)
        clear_queue(self._download_queue)
        self._download_finished.clear()
        transfer = self._transfer_cls()
        mnf_path = transfer.download(snapshot.path, tranzit_path)
        mnf = Configuration('ini')
        mnf.read(mnf_path)

        volume.fs_created = False
        volume.mkfs(snapshot.fstype)

        remote_path = os.path.dirname(snapshot.path)
        # Get links with md5 sums
        links = [(os.path.join(remote_path, chunk[0]), chunk[1]) for chunk in mnf.items('chunks')]
        links.sort()

        # Download 2 first chunks
        for link in links[:2]:
            transfer.download(link[0], tranzit_path)
            chunk_path = os.path.join(tranzit_path, os.path.basename(link[0]))
            if self._md5sum(chunk_path) != link[1]:
                raise Exception("md5sum of chunk %s is not correct." % chunk_path)
            self._writer_queue.put(chunk_path)

        if hasattr(snapshot, 'snap_strategy') and snapshot.snap_strategy == 'data':
            restore_strategy = DataRestoreStrategy(self._logger)
        else:
            restore_strategy = DeviceRestoreStrategy(self._logger)

        writer = threading.Thread(target=restore_strategy.restore, name='writer',
                                                        args=(self._writer_queue, volume, self._download_finished))
        writer.start()

        # Add remaining files to download queue
        for link in links[2:]:
            self._download_queue.put(link)

        downloader = threading.Thread(name="Downloader", target=self._downloader,
                                                                  args=(tranzit_path,))
        downloader.start()
        downloader.join()
        writer.join()

    def _manifest(self):
        f_manifest = CnfController._manifest
        base_manifest = f_manifest.fget(self)
        path = self._manifest_path

        s = {}
        out = None

        if not self._merged_manifest:
            cmd = '%s --no-defaults --verbose SU_EXEC' % mysql_svc.MYSQLD_PATH
            out = system2('%s - mysql -s %s -c "%s"' % (SU_EXEC, BASH, cmd),
                                    shell=True, raise_exc=False, silent=True)[0]

        if out:
            raw = out.split(49*'-'+' '+24*'-')
            if raw:
                a = raw[-1].split('\n')
                if len(a) > 5:
                    b = a[1:-5]
                    for item in b:
                        c = item.split()
                        if len(c) > 1:
                            key = c[0]
                            val = ' '.join(c[1:])
                            s[key.strip()] = val.strip()

        if s:
            m_config = Configuration('ini')
            if os.path.exists(path):
                m_config.read(path)

            for variable in base_manifest:
                name = variable.name
                dv_path = './%s/default-value' % name

                try:
                    old_value =  m_config.get(dv_path)
                    if name in s:
                        new_value = s[name]
                    else:
                        name = name.replace('_','-')
                        if name in s:
                            new_value = self.definitions[s[name]] if s[name] in self.definitions else s[name]
                            if old_value != new_value and new_value != '(No default value)':
                                LOG.debug('Replacing %s default value %s with precompiled value %s',
                                                name, old_value, new_value)
                                m_config.set(path=dv_path, value=new_value, force=True)
                except NoPathError:
                    pass
            m_config.write(path)

        self._merged_manifest = _CnfManifest(path)
        return self._merged_manifest

    def _test_option(self, option):
        setattr(self.cnf, option, 'value')
        c = Configuration('mongodb')
        c.read(self.cnf_path)
        self.assertEqual('value', c.get(option))

        setattr(self.cnf, option, None)
        c = Configuration('mongodb')
        c.read(self.cnf_path)
        self.assertRaises(NoPathError, c.get, option)

 def set(self, option, value):
     if not self.data:
         self.data = Configuration(self.config_type)
         if os.path.exists(self.path):
             self.data.read(self.path)
     if value:
         self.data.set(option, value, force=True)
     else:
         self.data.remove(option)
     if self.autosave:
         self.save_data()
         self.data = None

	def set(self, option, value):
		if not self.data:
			self.data = Configuration(self.config_type)
			if os.path.exists(self.path):
				self.data.read(self.path)
		if value:
			self.data.set(option,str(value), force=True)
		elif self.comment_empty: 
			self.data.comment(option)
		if self.autosave:
			self.save_data()
			self.data = None

    def _test_numeric_option(self, option):
        self.assertRaises(ValueError, setattr, self.cnf, option, 'NotNumericValue')

        setattr(self.cnf, option, 113)
        c = Configuration('mongodb')
        c.read(self.cnf_path)
        self.assertEqual('113', c.get(option))
        self.assertEqual(113, getattr(self.cnf, option))

        setattr(self.cnf, option, None)
        c = Configuration('mongodb')
        c.read(self.cnf_path)
        self.assertRaises(NoPathError, c.get, option)

	def set(self, option, value, append=False):
		if not self.data:
			self.data = Configuration(self.config_type)
			if os.path.exists(self.path):
				self.data.read(self.path)
		if value:
			if append:
				self.data.add(option, str(value))
			else:
				self.data.set(option,str(value), force=True)
		else:
			self.data.comment(option)
		if self.autosave:
			self.save_data()
			self.data = None

	def get_list(self, option):
		if not self.data:
			self.data =  Configuration(self.config_type)
			if os.path.exists(self.path):
				self.data.read(self.path)
		try:
			value = self.data.get_list(option)
		except NoPathError:
			try:
				value = getattr(self, option+'_default')
			except AttributeError:
				value = ()
		if self.autosave:
			self.data = None
		return value

    def _reload_backends(self):
        self._logger.info('Updating mysql-proxy backends list')
        self.config = Configuration('mysql')
        if os.path.exists(CONFIG_FILE_PATH):
            self.config.read(CONFIG_FILE_PATH)
            self.config.remove('./mysql-proxy/proxy-backend-addresses')
            self.config.remove('./mysql-proxy/proxy-read-only-backend-addresses')

        try:
            self.config.get('./mysql-proxy')
        except NoPathError:
            self.config.add('./mysql-proxy')

        queryenv = bus.queryenv_service
        roles = queryenv.list_roles()
        master = None
        slaves = []

        for role in roles:
            if not is_mysql_role(role.behaviour):
                continue

            for host in role.hosts:
                ip = host.internal_ip or host.external_ip
                if host.replication_master:
                    master = ip
                else:
                    slaves.append(ip)

        if master:
            self._logger.debug('Adding mysql master %s to  mysql-proxy defaults file', master)
            self.config.add('./mysql-proxy/proxy-backend-addresses', '%s:3306' % master)
        if slaves:
            self._logger.debug('Adding mysql slaves to  mysql-proxy defaults file: %s', ', '.join(slaves))
            for slave in slaves:
                self.config.add('./mysql-proxy/proxy-read-only-backend-addresses', '%s:3306' % slave)

        self.config.set('./mysql-proxy/pid-file', PID_FILE, force=True)
        self.config.set('./mysql-proxy/daemon', 'true', force=True)
        self.config.set('./mysql-proxy/log-file', LOG_FILE, force=True)
        if self.service.version > (0,8,0):
            self.config.set('./mysql-proxy/plugins', 'proxy', force=True)

        self._logger.debug('Saving new mysql-proxy defaults file')
        self.config.write(CONFIG_FILE_PATH)
        os.chmod(CONFIG_FILE_PATH, 0660)

        self.service.restart()

 def _init_configuration(self):
     if not self.data:
         self.data = Configuration(self.config_type)
         if os.path.exists(self.path):
             self.data.read(self.path)