Onionr/onionr/onionrplugins.py

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'''
Onionr - P2P Microblogging Platform & Social network
This file deals with management of modules/plugins.
'''
'''
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
'''
import os, re, importlib, config, logger
import onionrevents as events
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# set data dir
dataDir = os.environ.get('ONIONR_HOME', os.environ.get('DATA_DIR', 'data/'))
if not dataDir.endswith('/'):
dataDir += '/'
_pluginsfolder = dataDir + 'plugins/'
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_instances = dict()
def reload(onionr = None, stop_event = True):
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'''
Reloads all the plugins
'''
check()
try:
enabled_plugins = get_enabled_plugins()
if stop_event is True:
logger.debug('Reloading all plugins...')
else:
logger.debug('Loading all plugins...')
if stop_event is True:
for plugin in enabled_plugins:
stop(plugin, onionr)
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for plugin in enabled_plugins:
start(plugin, onionr)
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return True
except:
logger.error('Failed to reload plugins.')
return False
def enable(name, onionr = None, start_event = True):
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'''
Enables a plugin
'''
check()
if exists(name):
enabled_plugins = get_enabled_plugins()
if not name in enabled_plugins:
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try:
events.call(get_plugin(name), 'enable', onionr)
except ImportError as e: # Was getting import error on Gitlab CI test "data"
# NOTE: If you are experiencing issues with plugins not being enabled, it might be this resulting from an error in the module
# can happen inconsistenly (especially between versions)
logger.debug('Failed to enable module; Import error: %s' % e)
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return False
else:
enabled_plugins.append(name)
config.set('plugins.enabled', enabled_plugins, True)
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if start_event is True:
start(name)
return True
else:
return False
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else:
logger.error('Failed to enable plugin \"%s\" (disabling plugin).' % name)
logger.debug('Plugins folder not found: %s' % get_plugins_folder(str(name).lower()))
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disable(name)
return False
def disable(name, onionr = None, stop_event = True):
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'''
Disables a plugin
'''
check()
if is_enabled(name):
enabled_plugins = get_enabled_plugins()
enabled_plugins.remove(name)
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config.set('plugins.enabled', enabled_plugins, True)
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if exists(name):
events.call(get_plugin(name), 'disable', onionr)
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if stop_event is True:
stop(name)
def start(name, onionr = None):
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'''
Starts the plugin
'''
check()
if exists(name):
try:
plugin = get_plugin(name)
if plugin is None:
raise Exception('Failed to import module.')
else:
events.call(plugin, 'start', onionr)
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return plugin
except:
logger.error('Failed to start module \"%s\".' % name)
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else:
logger.error('Failed to start nonexistant module \"%s\".' % name)
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return None
def stop(name, onionr = None):
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'''
Stops the plugin
'''
check()
if exists(name):
try:
plugin = get_plugin(name)
if plugin is None:
raise Exception('Failed to import module.')
else:
events.call(plugin, 'stop', onionr)
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return plugin
except:
logger.error('Failed to stop module \"%s\".' % name)
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else:
logger.error('Failed to stop nonexistant module \"%s\".' % name)
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return None
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# credit: https://stackoverflow.com/a/29589414
def import_module_from_file(full_path_to_module):
"""
Import a module given the full path/filename of the .py file
Python 3.4
"""
module = None
# Get module name and path from full path
module_dir, module_file = os.path.split(full_path_to_module)
module_name, module_ext = os.path.splitext(module_file)
# Get module "spec" from filename
spec = importlib.util.spec_from_file_location(module_name,full_path_to_module)
module = spec.loader.load_module()
return module
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def get_plugin(name):
'''
Returns the instance of a module
'''
check()
if str(name).lower() in _instances:
return _instances[str(name).lower()]
else:
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_instances[str(name).lower()] = import_module_from_file(get_plugins_folder(name, False) + 'main.py')
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return get_plugin(name)
def get_plugins():
'''
Returns a list of plugins (deprecated)
'''
return _instances
def exists(name):
'''
Return value indicates whether or not the plugin exists
'''
return os.path.isdir(get_plugins_folder(str(name).lower()))
def get_enabled_plugins():
'''
Returns a list of the enabled plugins
'''
check()
config.reload()
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return list(config.get('plugins.enabled', list()))
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def is_enabled(name):
'''
Return value indicates whether or not the plugin is enabled
'''
return name in get_enabled_plugins()
def get_plugins_folder(name = None, absolute = True):
'''
Returns the path to the plugins folder
'''
path = ''
if name is None:
path = _pluginsfolder
else:
# only allow alphanumeric characters
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path = _pluginsfolder + re.sub('[^0-9a-zA-Z_]+', '', str(name).lower())
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if absolute is True:
path = os.path.abspath(path)
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return path + '/'
def get_plugin_data_folder(name, absolute = True):
'''
Returns the location of a plugin's data folder
'''
return get_plugins_folder(name, absolute) + dataDir
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def check():
'''
Checks to make sure files exist
'''
config.reload()
if not config.is_set('plugins'):
logger.debug('Generating plugin configuration data...')
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config.set('plugins', {'enabled': []}, True)
if not os.path.exists(os.path.dirname(get_plugins_folder())):
logger.debug('Generating plugin data folder...')
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os.makedirs(os.path.dirname(get_plugins_folder()))
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return