mirror of https://github.com/gsi-upm/senpy
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262 lines
9.2 KiB
Python
262 lines
9.2 KiB
Python
"""
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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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import gevent
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from gevent import monkey
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monkey.patch_all()
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from .plugins import SenpyPlugin, SentimentPlugin, EmotionPlugin
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from .models import Error
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from .blueprints import nif_blueprint, demo_blueprint
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from git import Repo, InvalidGitRepositoryError
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from functools import partial
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import os
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import fnmatch
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import inspect
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import sys
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import imp
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import logging
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import traceback
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import gevent
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import json
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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, app=None, plugin_folder="plugins", default_plugins=False):
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self.app = app
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self._search_folders = set()
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self._plugin_list = []
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self._outdated = True
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self.add_folder(plugin_folder)
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if default_plugins:
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base_folder = os.path.join(os.path.dirname(__file__), "plugins")
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self.add_folder(base_folder)
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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:
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app.teardown_request(self.teardown)
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app.register_blueprint(nif_blueprint, url_prefix="/api")
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app.register_blueprint(demo_blueprint, url_prefix="/")
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def add_folder(self, folder):
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logger.debug("Adding folder: %s", folder)
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if os.path.isdir(folder):
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self._search_folders.add(folder)
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self._outdated = True
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else:
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logger.debug("Not a folder: %s", folder)
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def analyse(self, **params):
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algo = None
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logger.debug("analysing with params: {}".format(params))
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if "algorithm" in params:
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algo = params["algorithm"]
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elif self.plugins:
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algo = self.default_plugin and self.default_plugin.name
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if not algo:
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return Error(status=404,
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message=("No plugins found."
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" Please install one.").format(algo))
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if algo in self.plugins:
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if self.plugins[algo].is_activated:
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plug = self.plugins[algo]
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resp = plug.analyse(**params)
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resp.analysis.append(plug)
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logger.debug("Returning analysis result: {}".format(resp))
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return resp
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else:
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logger.debug("Plugin not activated: {}".format(algo))
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return Error(status=400,
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message=("The algorithm '{}'"
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" is not activated yet").format(algo))
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else:
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logger.debug(("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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return Error(status=404,
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message="The algorithm '{}' is not valid"
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.format(algo))
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@property
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def default_plugin(self):
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candidates = self.filter_plugins(is_activated=True)
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if len(candidates) > 0:
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candidate = list(candidates.values())[0]
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logger.debug("Default: {}".format(candidate))
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return candidate
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else:
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return None
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def parameters(self, algo):
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return getattr(self.plugins.get(algo) or self.default_plugin,
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"extra_params",
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{})
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def activate_all(self, sync=False):
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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=False):
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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_plugin(self, plugin_name, active=True, *args, **kwargs):
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''' We're using a variable in the plugin itself to activate/deactive plugins.\
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Note that plugins may activate themselves by setting this variable.
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'''
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self.plugins[plugin_name].is_activated = active
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def activate_plugin(self, plugin_name, sync=False):
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plugin = self.plugins[plugin_name]
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logger.info("Activating plugin: {}".format(plugin.name))
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def act():
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try:
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plugin.activate()
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logger.info("Plugin activated: {}".format(plugin.name))
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except Exception as ex:
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logger.error("Error activating plugin {}: {}".format(plugin.name,
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ex))
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logger.error("Trace: {}".format(traceback.format_exc()))
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th = gevent.spawn(act)
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th.link_value(partial(self._set_active_plugin, plugin_name, True))
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if sync:
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th.join()
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else:
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return th
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def deactivate_plugin(self, plugin_name, sync=False):
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plugin = self.plugins[plugin_name]
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def deact():
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try:
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plugin.deactivate()
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logger.info("Plugin deactivated: {}".format(plugin.name))
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except Exception as ex:
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logger.error("Error deactivating plugin {}: {}".format(plugin.name,
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ex))
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logger.error("Trace: {}".format(traceback.format_exc()))
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th = gevent.spawn(deact)
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th.link_value(partial(self._set_active_plugin, plugin_name, False))
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if sync:
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th.join()
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else:
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return th
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def reload_plugin(self, name):
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logger.debug("Reloading {}".format(name))
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plugin = self.plugins[name]
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try:
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del self.plugins[name]
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nplug = self._load_plugin(plugin.module, plugin.path)
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self.plugins[nplug.name] = nplug
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except Exception as ex:
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logger.error('Error reloading {}: {}'.format(name, ex))
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self.plugins[name] = plugin
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@staticmethod
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def _load_plugin(root, filename):
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logger.debug("Loading plugin: {}".format(filename))
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fpath = os.path.join(root, filename)
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with open(fpath, 'r') as f:
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info = json.load(f)
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logger.debug("Info: {}".format(info))
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sys.path.append(root)
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module = info["module"]
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name = info["name"]
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(fp, pathname, desc) = imp.find_module(module, [root, ])
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try:
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tmp = imp.load_module(module, fp, pathname, desc)
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sys.path.remove(root)
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candidate = None
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for _, obj in inspect.getmembers(tmp):
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if inspect.isclass(obj) and inspect.getmodule(obj) == tmp:
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logger.debug(("Found plugin class:"
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" {}@{}").format(obj, inspect.getmodule(obj))
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)
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candidate = obj
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break
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if not candidate:
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logger.debug("No valid plugin for: {}".format(filename))
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return
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module = candidate(info=info)
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try:
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repo_path = root
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module._repo = Repo(repo_path)
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except InvalidGitRepositoryError:
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module._repo = None
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except Exception as ex:
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logger.error("Exception importing {}: {}".format(filename, ex))
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logger.error("Trace: {}".format(traceback.format_exc()))
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return None, None
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return name, module
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def _load_plugins(self):
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plugins = {}
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for search_folder in self._search_folders:
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for root, dirnames, filenames in os.walk(search_folder):
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for filename in fnmatch.filter(filenames, '*.senpy'):
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name, plugin = self._load_plugin(root, filename)
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if plugin and name not in self._plugin_list:
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plugins[name] = plugin
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self._outdated = False
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return plugins
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def teardown(self, exception):
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pass
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@property
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def plugins(self):
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""" Return the plugins registered for a given application. """
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if self._outdated:
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self._plugin_list = self._load_plugins()
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return self._plugin_list
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def filter_plugins(self, **kwargs):
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""" Filter plugins by different criteria """
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def matches(plug):
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res = all(getattr(plug, k, None) == v for (k, v) in kwargs.items())
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logger.debug("matching {} with {}: {}".format(plug.name,
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kwargs,
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res))
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return res
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if not kwargs:
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return self.plugins
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else:
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return {n: p for n, p in self.plugins.items() if matches(p)}
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def sentiment_plugins(self):
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""" Return only the sentiment plugins """
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return {p: plugin for p, plugin in self.plugins.items() if
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isinstance(plugin, SentimentPlugin)}
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