mirror of https://github.com/gsi-upm/senpy
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344 lines
12 KiB
Python
344 lines
12 KiB
Python
"""
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Main class for Senpy.
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It orchestrates plugin (de)activation and analysis.
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"""
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from future import standard_library
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standard_library.install_aliases()
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from . import plugins, api
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from .plugins import Plugin
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from .models import Error
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from .blueprints import api_blueprint, demo_blueprint, ns_blueprint
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from threading import Thread
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from functools import partial
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import os
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import copy
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import errno
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import logging
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import traceback
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logger = logging.getLogger(__name__)
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class Senpy(object):
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""" Default Senpy extension for Flask """
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def __init__(self,
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app=None,
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plugin_folder=".",
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data_folder=None,
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default_plugins=False):
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default_data = os.path.join(os.getcwd(), 'senpy_data')
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self.data_folder = data_folder or os.environ.get('SENPY_DATA', default_data)
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try:
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os.makedirs(self.data_folder)
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except OSError as e:
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if e.errno == errno.EEXIST:
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logger.debug('Data folder exists: {}'.format(self.data_folder))
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else: # pragma: no cover
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raise
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self._default = None
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self._plugins = {}
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if plugin_folder:
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self.add_folder(plugin_folder)
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if default_plugins:
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self.add_folder('plugins', from_root=True)
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else:
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# Add only conversion plugins
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self.add_folder(os.path.join('plugins', 'conversion'),
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from_root=True)
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self.app = app
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if app is not None:
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self.init_app(app)
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def init_app(self, app):
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""" Initialise a flask app to add plugins to its context """
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"""
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Note: I'm not particularly fond of adding self.app and app.senpy, but
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I can't think of a better way to do it.
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"""
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app.senpy = self
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# Use the newstyle teardown_appcontext if it's available,
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# otherwise fall back to the request context
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if hasattr(app, 'teardown_appcontext'):
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app.teardown_appcontext(self.teardown)
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else: # pragma: no cover
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app.teardown_request(self.teardown)
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app.register_blueprint(api_blueprint, url_prefix="/api")
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app.register_blueprint(ns_blueprint, url_prefix="/ns")
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app.register_blueprint(demo_blueprint, url_prefix="/")
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def add_plugin(self, plugin):
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self._plugins[plugin.name.lower()] = plugin
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def delete_plugin(self, plugin):
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del self._plugins[plugin.name.lower()]
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def plugins(self, **kwargs):
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""" Return the plugins registered for a given application. Filtered by criteria """
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return list(plugins.pfilter(self._plugins, **kwargs))
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def get_plugin(self, name, default=None):
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if name == 'default':
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return self.default_plugin
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plugin = name.lower()
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if plugin in self._plugins:
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return self._plugins[plugin]
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results = self.plugins(id='plugins/{}'.format(name))
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if not results:
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return Error(message="Plugin not found", status=404)
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return results[0]
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@property
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def analysis_plugins(self):
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""" Return only the analysis plugins """
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return self.plugins(plugin_type='analysisPlugin')
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def add_folder(self, folder, from_root=False):
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""" Find plugins in this folder and add them to this instance """
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if from_root:
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folder = os.path.join(os.path.dirname(__file__), folder)
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logger.debug("Adding folder: %s", folder)
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if os.path.isdir(folder):
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new_plugins = plugins.from_folder([folder],
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data_folder=self.data_folder)
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for plugin in new_plugins:
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self.add_plugin(plugin)
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else:
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raise AttributeError("Not a folder or does not exist: %s", folder)
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def _get_plugins(self, request):
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if not self.analysis_plugins:
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raise Error(
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status=404,
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message=("No plugins found."
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" Please install one."))
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algos = request.parameters.get('algorithm', None)
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if not algos:
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if self.default_plugin:
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algos = [self.default_plugin.name, ]
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else:
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raise Error(
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status=404,
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message="No default plugin found, and None provided")
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plugins = list()
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for algo in algos:
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algo = algo.lower()
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if algo not in self._plugins:
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msg = ("The algorithm '{}' is not valid\n"
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"Valid algorithms: {}").format(algo,
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self._plugins.keys())
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logger.debug(msg)
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raise Error(
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status=404,
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message=msg)
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plugins.append(self._plugins[algo])
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return plugins
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def _process_entries(self, entries, req, plugins):
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"""
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Recursively process the entries with the first plugin in the list, and pass the results
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to the rest of the plugins.
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"""
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if not plugins:
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for i in entries:
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yield i
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return
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plugin = plugins[0]
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self._activate(plugin) # Make sure the plugin is activated
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specific_params = api.parse_extra_params(req, plugin)
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req.analysis.append({'plugin': plugin,
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'parameters': specific_params})
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results = plugin.analyse_entries(entries, specific_params)
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for i in self._process_entries(results, req, plugins[1:]):
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yield i
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def install_deps(self):
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for plugin in self.plugins(is_activated=True):
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plugins.install_deps(plugin)
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def analyse(self, request):
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"""
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Main method that analyses a request, either from CLI or HTTP.
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It takes a processed request, provided by the user, as returned
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by api.parse_call().
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"""
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logger.debug("analysing request: {}".format(request))
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try:
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entries = request.entries
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request.entries = []
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plugins = self._get_plugins(request)
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results = request
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for i in self._process_entries(entries, results, plugins):
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results.entries.append(i)
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self.convert_emotions(results)
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logger.debug("Returning analysis result: {}".format(results))
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except (Error, Exception) as ex:
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if not isinstance(ex, Error):
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msg = "Error during analysis: {} \n\t{}".format(ex,
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traceback.format_exc())
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ex = Error(message=msg, status=500)
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logger.exception('Error returning analysis result')
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raise ex
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results.analysis = [i['plugin'].id for i in results.analysis]
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return results
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def _conversion_candidates(self, fromModel, toModel):
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candidates = self.plugins(plugin_type='emotionConversionPlugin')
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for candidate in candidates:
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for pair in candidate.onyx__doesConversion:
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logging.debug(pair)
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if pair['onyx:conversionFrom'] == fromModel \
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and pair['onyx:conversionTo'] == toModel:
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yield candidate
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def convert_emotions(self, resp):
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"""
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Conversion of all emotions in a response **in place**.
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In addition to converting from one model to another, it has
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to include the conversion plugin to the analysis list.
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Needless to say, this is far from an elegant solution, but it works.
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@todo refactor and clean up
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"""
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plugins = [i['plugin'] for i in resp.analysis]
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params = resp.parameters
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toModel = params.get('emotionModel', None)
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if not toModel:
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return
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logger.debug('Asked for model: {}'.format(toModel))
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output = params.get('conversion', None)
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candidates = {}
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for plugin in plugins:
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try:
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fromModel = plugin.get('onyx:usesEmotionModel', None)
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candidates[plugin.id] = next(self._conversion_candidates(fromModel, toModel))
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logger.debug('Analysis plugin {} uses model: {}'.format(plugin.id, fromModel))
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except StopIteration:
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e = Error(('No conversion plugin found for: '
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'{} -> {}'.format(fromModel, toModel)),
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status=404)
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e.original_response = resp
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e.parameters = params
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raise e
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newentries = []
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for i in resp.entries:
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if output == "full":
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newemotions = copy.deepcopy(i.emotions)
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else:
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newemotions = []
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for j in i.emotions:
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plugname = j['prov:wasGeneratedBy']
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candidate = candidates[plugname]
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resp.analysis.append({'plugin': candidate,
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'parameters': params})
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for k in candidate.convert(j, fromModel, toModel, params):
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k.prov__wasGeneratedBy = candidate.id
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if output == 'nested':
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k.prov__wasDerivedFrom = j
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newemotions.append(k)
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i.emotions = newemotions
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newentries.append(i)
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resp.entries = newentries
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@property
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def default_plugin(self):
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if not self._default or not self._default.is_activated:
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candidates = self.plugins(plugin_type='analysisPlugin',
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is_activated=True)
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if len(candidates) > 0:
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self._default = candidates[0]
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else:
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self._default = None
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logger.debug("Default: {}".format(self._default))
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return self._default
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@default_plugin.setter
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def default_plugin(self, value):
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if isinstance(value, Plugin):
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if not value.is_activated:
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raise AttributeError('The default plugin has to be activated.')
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self._default = value
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else:
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self._default = self._plugins[value.lower()]
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def activate_all(self, sync=True):
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ps = []
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for plug in self._plugins.keys():
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ps.append(self.activate_plugin(plug, sync=sync))
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return ps
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def deactivate_all(self, sync=True):
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ps = []
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for plug in self._plugins.keys():
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ps.append(self.deactivate_plugin(plug, sync=sync))
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return ps
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def _set_active(self, plugin, active=True, *args, **kwargs):
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''' We're using a variable in the plugin itself to activate/deactivate plugins.\
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Note that plugins may activate themselves by setting this variable.
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'''
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plugin.is_activated = active
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def _activate(self, plugin):
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success = False
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with plugin._lock:
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if plugin.is_activated:
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return
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plugin.activate()
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msg = "Plugin activated: {}".format(plugin.name)
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logger.info(msg)
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success = True
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self._set_active(plugin, success)
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def activate_plugin(self, plugin_name, sync=True):
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plugin_name = plugin_name.lower()
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if plugin_name not in self._plugins:
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raise Error(
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message="Plugin not found: {}".format(plugin_name), status=404)
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plugin = self._plugins[plugin_name]
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logger.info("Activating plugin: {}".format(plugin.name))
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if sync or 'async' in plugin and not plugin.async:
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self._activate(plugin)
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else:
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th = Thread(target=partial(self._activate, plugin))
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th.start()
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return th
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def _deactivate(self, plugin):
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with plugin._lock:
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if not plugin.is_activated:
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return
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plugin.deactivate()
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logger.info("Plugin deactivated: {}".format(plugin.name))
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def deactivate_plugin(self, plugin_name, sync=True):
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plugin_name = plugin_name.lower()
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if plugin_name not in self._plugins:
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raise Error(
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message="Plugin not found: {}".format(plugin_name), status=404)
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plugin = self._plugins[plugin_name]
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self._set_active(plugin, False)
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if sync or 'async' in plugin and not plugin.async:
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self._deactivate(plugin)
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else:
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th = Thread(target=partial(self._deactivate, plugin))
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th.start()
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return th
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def teardown(self, exception):
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pass
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