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#!/usr/bin/env python |
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# -*- coding: utf8 -*- |
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# |
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# caches.py : module that provides a class and tools to manage caches |
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# for versions.py modules |
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# (C) Copyright 2016 - 2018 Olivier Delhomme |
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# e-mail : [email protected] |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 3, or (at your option) |
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# any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software Foundation, |
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# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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import codecs |
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import os |
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import common |
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__author__ = "Olivier Delhomme <[email protected]>" |
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def open_and_truncate_file(filename): |
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""" |
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Opens filename for writing truncating it to a zero length file |
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and returns a python file object. |
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""" |
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cache_file = codecs.open(filename, 'w', encoding='utf-8') |
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cache_file.truncate(0) |
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cache_file.flush() |
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return cache_file |
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# End of open_and_truncate_file() function |
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class FileCache: |
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""" |
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This class should help in managing cache files |
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""" |
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cache_filename = '' |
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cache_dict = {} # Dictionary of projects and their associated version |
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def __init__(self, local_dir, filename): |
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""" |
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Inits the class. 'local_dir' must be a directory where we want to |
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store the cache file named 'filename' |
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""" |
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self.cache_filename = os.path.join(local_dir, filename) |
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self.cache_dict = {} |
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self._read_cache_file() |
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# End of __init__() function |
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def _return_project_and_version_from_line(self, line): |
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""" |
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Splits the line into a project and a version if possible (the line |
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must contain a whitespace). |
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""" |
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line = line.strip() |
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project = line |
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version = '' |
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if line.count(' ') > 0: |
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(project, version) = line.split(' ', 1) |
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return (project, version) |
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# End of _return_project_and_version_from_line() function |
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def _read_cache_file(self): |
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""" |
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Reads the cache file and puts it into a dictionary of project with |
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their associated version |
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""" |
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if os.path.isfile(self.cache_filename): |
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cache_file = codecs.open(self.cache_filename, 'r', encoding='utf-8') |
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for line in cache_file: |
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(project, version) = self._return_project_and_version_from_line(line) |
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self.cache_dict[project] = version |
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cache_file.close() |
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# End of _read_cache_file() function |
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def write_cache_file(self): |
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""" |
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Overwrites dictionary cache to the cache file |
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""" |
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cache_file = open_and_truncate_file(self.cache_filename) |
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for (project, version) in self.cache_dict.items(): |
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cache_file.write('%s %s\n' % (project, version)) |
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cache_file.close() |
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# End of write_cache_file() function |
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def print_if_newest_version(self, project, version, debug): |
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""" |
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Prints the project and it's version if it is newer than the |
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one in cache. |
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""" |
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try: |
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version_cache = self.cache_dict[project] |
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common.print_debug(debug, u'\t\tIn cache: {}'.format(version_cache)) |
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if version != version_cache: |
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common.print_project_version(project, version) |
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except KeyError: |
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common.print_project_version(project, version) |
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# End of print_if_newest_version() function. |
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def update_cache_dict(self, project, version, debug): |
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""" |
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Updates cache dictionary if needed. We always keep the latest version. |
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""" |
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try: |
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version_cache = self.cache_dict[project] |
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common.print_debug(debug, u'\t\tUpdating cache with in cache: {} / new ? version {}'.format(version_cache, version)) |
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if version != version_cache: |
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self.cache_dict[project] = version |
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except KeyError: |
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self.cache_dict[project] = version |
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# End of update_cache_dict() function |
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def print_cache_dict(self, sitename): |
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""" |
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Pretty prints the cache dictionary as it is recorded in the files. |
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""" |
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print(u'{}:'.format(sitename)) |
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# Gets project and version tuple sorted by project lowered while sorting |
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for project, version in sorted(self.cache_dict.items(), key=lambda proj: proj[0].lower()): |
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print(u'\t{} {}'.format(project, version)) |
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print('') |
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# End of print_cache_dict() function |
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# End of FileCache class |
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class FeedCache: |
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cache_filename = '' |
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year = 2016 |
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month = 5 |
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day = 1 |
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hour = 0 |
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minute = 0 |
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date_minutes = 0 |
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def __init__(self, local_dir, filename): |
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""" |
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Inits the class. 'local_dir' must be a directory where we want to |
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store the cache file named 'filename' |
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""" |
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self.cache_filename = os.path.join(local_dir, filename) |
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self.read_cache_feed() |
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# End of __init__() function |
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def read_cache_feed(self): |
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""" |
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Reads the cache file which should only contain one date on the |
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first line |
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""" |
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if os.path.isfile(self.cache_filename): |
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cache_file = codecs.open(self.cache_filename, 'r', encoding='utf-8') |
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(self.year, self.month, self.day, self.hour, self.minute) = cache_file.readline().strip().split(' ', 4) |
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self.date_minutes = self._calculate_minutes(int(self.year), int(self.month), int(self.day), int(self.hour), int(self.minute)) |
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cache_file.close() |
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# End of read_cache_feed() function |
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def write_cache_feed(self): |
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""" |
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Overwrites the cache file with values stored in this class |
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""" |
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cache_file = open_and_truncate_file(self.cache_filename) |
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cache_file.write('%s %s %s %s %s' % (self.year, self.month, self.day, self.hour, self.minute)) |
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cache_file.close() |
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# End of write_cache_feed() function |
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def update_cache_feed(self, date): |
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""" |
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Updates the values stored in the class with the date which should |
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be a time.struct_time |
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""" |
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self.year = date.tm_year |
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self.month = date.tm_mon |
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self.day = date.tm_mday |
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self.hour = date.tm_hour |
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self.minute = date.tm_min |
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self.date_minutes = self._calculate_minutes_from_date(date) |
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# End of update_cache_feed() function |
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def _calculate_minutes(self, year, mon, day, hour, mins): |
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""" |
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Calculate a number of minutes with all parameters and returns |
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this. |
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>>> fc = FeedCache('localdir','filename') |
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>>> fc._calculate_minutes(2016, 5, 1, 0, 0) |
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1059827040 |
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""" |
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minutes = (year * 365 * 24 * 60) + \ |
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(mon * 30 * 24 * 60) + \ |
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(day * 24 * 60) + \ |
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(hour * 60) + \ |
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(mins) |
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return minutes |
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# End of _calculate_minutes() function |
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def _calculate_minutes_from_date(self, date): |
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""" |
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Transforms a date in a number of minutes to ease comparisons |
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and returns this number of minutes |
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""" |
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return self._calculate_minutes(date.tm_year, date.tm_mon, date.tm_mday, date.tm_hour, date.tm_min) |
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# End of _calculate_minutes() function |
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def is_newer(self, date): |
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""" |
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Tells whether "date" is newer than the one in the cache (returns True |
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or not (returns False) |
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""" |
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minutes = self._calculate_minutes_from_date(date) |
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if minutes > self.date_minutes: |
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return True |
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else: |
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return False |
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# End of is_newer() function |
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# End of FeedCache class |
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def print_versions_from_cache(local_dir, cache_filename_list): |
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""" |
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Prints all projects and their associated data from the cache |
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""" |
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for cache_filename in cache_filename_list: |
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site_cache = FileCache(local_dir, cache_filename) |
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site_cache.print_cache_dict(cache_filename) |
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# End of print_versions_from_cache() |
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dupgit /
versions
