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#!/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 remove(self, overlay, path):
'''
Removes an overlay from installed overlays list.
'''
if overlay.name in self.overlays:
del self.overlays[overlay.name]
def write(self, path, remove=False):
'''
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
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