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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# COPYRIGHT NOTICE STARTS HERE
# Copyright 2019 © Samsung Electronics Co., Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# COPYRIGHT NOTICE ENDS HERE
import logging
from abc import ABC, abstractmethod
import prettytable
log = logging.getLogger(__name__)
class AbstractDownloader(ABC):
def __init__(self, list_type, *list_args):
self._list_type = list_type
self._data_list = {item: list_arg[1] for list_arg in list_args
for item in self._load_list(list_arg[0])}
self._missing = self.missing()
@property
def list_type(self):
"""
Type of resource in list
"""
return self._list_type
@staticmethod
def _load_list(path):
"""
Load list from file.
:param path: path to file
:return: set of items in list
"""
with open(path, 'r') as f:
return {item for item in (line.strip() for line in f)
if item and not item.startswith('#')}
@staticmethod
def _check_table(header, alignment_dict, data):
"""
General method to generate table
:param header: header of the table
:param alignment_dict: dictionary with alignment for columns
:param data: iterable of rows of table
:return: table formatted data
"""
table = prettytable.PrettyTable(header)
for k, v in alignment_dict.items():
table.align[k] = v
for row in sorted(data):
table.add_row(row)
return table
@abstractmethod
def download(self):
"""
Download resources from lists
"""
pass
@abstractmethod
def _is_missing(self, item):
"""
Check if item is not downloaded
"""
pass
def missing(self):
"""
Check for missing data (not downloaded)
:return: dictionary of missing items
"""
self._missing = {item: dst for item, dst in self._data_list.items() if
self._is_missing(item)}
return self._missing
def _log_existing(self):
"""
Log items that are already downloaded.
"""
for item in self._merged_lists():
if item not in self._missing:
if type(self).__name__ == 'DockerDownloader':
log.info('Docker image present: {}'.format(item))
else:
log.info('File or directory present: {}'.format(item))
def _merged_lists(self):
"""
Get all item names in one set
:return: set with all items
"""
return set(self._data_list.keys())
def _initial_log(self):
"""
Log initial info for download.
:return: True if download is necessary False if everything is already downloaded
"""
self._log_existing()
items_left = len(self._missing)
class_name = type(self).__name__
if items_left == 0:
log.info('{}: Everything seems to be present no download necessary.'.format(class_name))
return False
log.info('{}: Initializing download {} {} are not present.'.format(class_name, items_left,
self._list_type))
return True
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