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Viewing File: config.py
# coding=utf-8
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
from __future__ import absolute_import
from __future__ import print_function
from __future__ import division
import json
import os
from abc import ABCMeta, abstractmethod, abstractproperty
from future.utils import iteritems
from secureio import write_file_via_tempfile
from clselect import utils
from .pkgmanager import BasePkgManager # NOQA
from . import BaseSelectorError, ENABLED_STATUS, DISABLED_STATUS
from future.utils import with_metaclass
class BaseSelectorConfig(with_metaclass(ABCMeta, object)):
"""
Base class that responsible for all interaction with CL selector config files
"""
def __init__(self, pkg):
self.Cfg = self._get_config_object()
self.pkg = pkg # type: BasePkgManager
self.reload()
@abstractproperty
def _config_file(self):
"""Should return path to the config file"""
raise NotImplementedError()
@abstractmethod
def _create_config_dirs(self):
"""Should create all needed directories for configs"""
raise NotImplementedError()
@staticmethod
def _get_config_object():
"""Override this method to change config parameters"""
# Useful for IDE-level auto-completion and type checking
class Cfg:
# Defaults. None values means that it's not specified in config yet
# and effective values depends on some logic in class properties
default_version = None
selector_enabled = None
disabled_versions = None
return Cfg
@property
def is_config_exists(self):
"""Check whether config file exists and is a regular file"""
return os.path.isfile(self._config_file)
def _dump(self):
"""
Returns underlying config as a plain dict. It will contain only
explicitly configured options (e.g. no elements with None values)
"""
tmp = {}
for k, v in iteritems(self.Cfg.__dict__):
if not k.startswith('__') and v is not None:
tmp[k] = v
return tmp
def _reset_cfg(self):
"""
Reset self.Cfg object to all None values before it will be loaded
from file as a part of self.reload()
"""
for k, v in iteritems(self.Cfg.__dict__):
if not k.startswith('__'):
setattr(self.Cfg, k, None)
def reload(self):
data = self._read_file_data()
if not data:
return # No file or it's empty - nothing to load, use defaults
try:
tmp = json.loads(data)
except (ValueError, TypeError) as e:
raise BaseSelectorError('Unable to parse json from {} ; Error: {}'
.format(self._config_file, e))
self._reset_cfg()
for k, v in iteritems(tmp):
setattr(self.Cfg, k, v)
def _read_file_data(self):
"""
Should return:
- whole file data for normal case
- None if file doesn't exists
- '' for empty file
"""
if not self.is_config_exists:
return None
try:
with open(self._config_file, 'rb') as fd:
data = fd.read()
except (IOError, OSError) as e:
raise BaseSelectorError('Unable to read data from {} ; Error: {}'
.format(self._config_file, e))
return data
def save(self):
if not self.is_config_exists:
self._create_config_dirs()
data = utils.pretty_json(self._dump())
return self._write_file_data(data)
def _write_file_data(self, data):
try:
write_file_via_tempfile(
content=data,
dest_path=self._config_file,
perm=0o644,
suffix='_tmp',
)
except (IOError, OSError) as e:
raise BaseSelectorError('Could not write system config ({})'.format(e))
def _ensure_version_installed(self, version):
if version not in self.pkg.installed_versions:
raise BaseSelectorError('Version "{}" is not installed'
.format(version))
@property
def selector_enabled(self):
"""Returns effective selector_enabled value"""
if self.Cfg.selector_enabled is None:
# Selector is disabled by default until explicitly enabled by admin
return False
return self.Cfg.selector_enabled and bool(self.pkg.installed_versions)
@selector_enabled.setter
def selector_enabled(self, value):
if value and not self.pkg.installed_versions:
raise BaseSelectorError(
"It's not allowed to enable Selector when "
"interpreter is not installed")
self.Cfg.selector_enabled = value
def get_default_version(self):
# If unspecified - we still return None so Frontend can show this
# somehow user-friendly
return self.Cfg.default_version
def set_default_version(self, version):
if version is None:
# We allow to reset to 'unspecified' state
self.Cfg.default_version = None
return
if version in (self.Cfg.disabled_versions or []):
raise BaseSelectorError(
"It's not allowed to set disabled version as the default one")
self._ensure_version_installed(version)
self.Cfg.default_version = version
def set_version_status(self, version, new_status):
disabled_list = self.Cfg.disabled_versions
if new_status == ENABLED_STATUS:
if disabled_list is not None and version in disabled_list:
disabled_list.remove(version)
if len(disabled_list) == 0:
self.Cfg.disabled_versions = None
elif new_status == DISABLED_STATUS:
if version == self.get_default_version():
raise BaseSelectorError("It's not allowed to disable currently "
"default version")
# We explicitly allow to disable even not installed versions too
# for future usage
if disabled_list is None:
self.Cfg.disabled_versions = [version]
else:
if version not in disabled_list:
disabled_list.append(version)
else:
raise BaseSelectorError('Unknown version status: "{}"'
.format(new_status))
@abstractproperty
def available_versions(self):
raise NotImplementedError()
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