diff options
Diffstat (limited to 'layman/db_modules/json_db/json_db.py')
-rw-r--r-- | layman/db_modules/json_db/json_db.py | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/layman/db_modules/json_db/json_db.py b/layman/db_modules/json_db/json_db.py new file mode 100644 index 0000000..47413c6 --- /dev/null +++ b/layman/db_modules/json_db/json_db.py @@ -0,0 +1,120 @@ +#!/usr/bin/python +# -*- coding: utf-8 -*- +################################################################################# +# LAYMAN JSON DB +################################################################################# +# File: json_db.py +# +# Access JSON overlay database(s). +# +# Copyright: +# (c) 2015 Devan Franchini +# Distributed under the terms of the GNU General Public License v2 +# +# Author(s): +# Devan Franchini <twitch153@gentoo.org> +# +'''Handler for json overlay databases.''' + +from __future__ import unicode_literals + +__version__ = "$Id: json.py 273 2015-07-10 10:10:49Z twitch153 $" + +#=============================================================================== +# +# Dependencies +# +#------------------------------------------------------------------------------- + +import json +import sys + +from layman.compatibility import fileopen +from layman.overlays.overlay import Overlay + + +#py3.2+ +if sys.hexversion >= 0x30200f0: + _UNICODE = 'unicode' +else: + _UNICODE = 'UTF-8' + + + +#=============================================================================== +# +# Class DBHandler +# +#------------------------------------------------------------------------------- + +class DBHandler(object): + ''' + Handle a json overlay database. + ''' + + def __init__(self, config, overlays, paths=None, ignore=0, + ignore_init_read_errors=False): + + self.config = config + self.ignore = ignore + self.overlays = overlays + self.paths = paths + self.output = config['output'] + self.ignore_init_read_errors = ignore_init_read_errors + + self.output.debug('Initializing JSON overlay list handler', 8) + + + def read_db(self, path, text=None): + ''' + Read the overlay definition file. + ''' + document = text + + if not document: + try: + with fileopen(path, 'r') as df: + document = df.read() + except Exception as error: + if not self.ignore_init_read_errors: + msg = 'JSON DBHandler - Failed to read the overlay list at'\ + '("%(path)s")' % {'path': path} + self.output.error(msg) + raise error + + self.add_new(document, origin=path) + + + def add_new(self, document=None, origin=None): + ''' + Reads in provided json text and generates overlays to populate database. + ''' + if not document: + msg = 'JSON DBHandler - add_new() failed: JSON text cannot be none'\ + '.\nOrigin: %(path)s' % {'path': origin} + self.output.warn(msg) + return False + + load = json.loads(document)['repo'] + + for ovl in load: + overlay = Overlay(self.config, json=ovl, ignore=self.ignore) + self.overlays[overlay.name] = overlay + + return True + + + def write(self, path): + ''' + Write the list of overlays to a file. + ''' + try: + repo = {'@encoding': 'unicode', '@version': '1.0', 'repo': []} + repo['repo'] = [self.overlays[key].to_json() for key in self.overlays] + with fileopen(path, 'w') as df: + df.write(json.dumps(repo, sort_keys=True, indent=2)) + except Exception as err: + msg = 'Failed to write to local overlays file: %(path)s\nError was'\ + ': %(err)s' % {'path': path, 'err': err} + self.output.error(msg) + raise err |