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+# -*- coding: utf-8 -*-
+#
+# File: portato/plugin.py
+# This file is part of the Portato-Project, a graphical portage-frontend.
+#
+# Copyright (C) 2007 René 'Necoro' Neumann
+# This is free software. You may redistribute copies of it under the terms of
+# the GNU General Public License version 2.
+# There is NO WARRANTY, to the extent permitted by law.
+#
+# Written by René 'Necoro' Neumann <necoro@necoro.net>
+
+"""A module containing the management of the plugin system."""
+
+from __future__ import absolute_import
+
+import os, os.path
+from xml.dom.minidom import parse
+from lxml import etree
+
+from .constants import PLUGIN_DIR, XSD_LOCATION
+from .helper import debug, info, warning, error, flatten
+
+class PluginImportException (ImportError):
+ pass
+
+class Options (object):
+ """The <options>-element."""
+
+ __options = ("disabled", "blocking")
+
+ def __init__ (self, options = None):
+
+ self.disabled = False
+ self.blocking = False
+
+ if options:
+ self.parse(options)
+
+ def parse (self, options):
+ for opt in options:
+ nodes = opt.childNodes
+ type = str(nodes[0].nodeValue.strip())
+ if type in self.__options:
+ self.set(type, True)
+
+ def get (self, name):
+ return self.__getattribute__(name)
+
+ def set (self, name, value):
+ return self.__setattr__(name, value)
+
+class Menu:
+ """A single <menu>-element."""
+ def __init__ (self, plugin, label, call):
+ """Constructor.
+
+ @param plugin: the plugin this menu belongs to
+ @type plugin: Plugin
+ @param label: the label to show
+ @type label: string
+ @param call: the function to call relative to the import statement
+ @type call: string
+
+ @raises PluginImportException: if the plugin's import could not be imported"""
+
+ self.label = label
+ self.plugin = plugin
+
+ if self.plugin.needs_import(): # get import
+ imp = self.plugin.get_import()
+ try:
+ mod = __import__(imp, globals(), locals(), [call])
+ except ImportError:
+ raise PluginImportException, imp
+
+ try:
+ self.call = eval("mod."+call) # build function
+ except AttributeError:
+ raise PluginImportException, imp
+ else:
+ try:
+ self.call = eval(call)
+ except AttributeError:
+ raise PluginImportException, imp
+
+class Connect:
+ """A single <connect>-element."""
+
+ def __init__ (self, hook, type, depend_plugin):
+ """Constructor.
+
+ @param hook: the parent Hook
+ @type hook: Hook
+ @param type: the type of the connect ("before", "after", "override")
+ @type type: string
+ @param depend_plugin: a plugin we are dependant on
+ @type depend_plugin: string or None"""
+
+ self.type = type
+ self.hook = hook
+ self.depend_plugin = depend_plugin
+
+ def is_before_type (self):
+ return self.type == "before"
+
+ def is_after_type (self):
+ return self.type == "after"
+
+ def is_override_type (self):
+ return self.type == "override"
+
+class Hook:
+ """A single <hook>-element."""
+
+ def __init__ (self, plugin, hook, call):
+ """Constructor.
+
+ @param plugin: the parent Plugin
+ @type plugin: Plugin
+ @param hook: the hook to add to
+ @type hook: string
+ @param call: the call to make
+ @type call: string"""
+
+ self.plugin = plugin
+ self.hook = hook
+ self.call = call
+ self.connects = []
+
+ def parse_connects (self, connects):
+ """This gets a list of <connect>-elements and parses them.
+
+ @param connects: the list of <connect>'s
+ @type connects: NodeList"""
+
+ if not connects: # no connects - assume "before" connect
+ self.connects.append(Connect(self, "before", None))
+
+ for c in connects:
+ type = c.getAttribute("type")
+ if type == '':
+ type = "before"
+
+ # get dep_plugin if available
+ dep_plugin = None
+ if c.hasChildNodes():
+ nodes = c.childNodes
+ dep_plugin = nodes[0].nodeValue.strip()
+
+ connect = Connect(self, type, dep_plugin)
+ self.connects.append(connect)
+
+class Plugin:
+ """A complete plugin."""
+
+ (STAT_DISABLED, STAT_TEMP_ENABLED, STAT_ENABLED, STAT_TEMP_DISABLED) = range(4)
+
+ def __init__ (self, file, name, author):
+ """Constructor.
+
+ @param file: the file name of the plugin.xml
+ @type file: string
+ @param name: the name of the plugin
+ @type name: Node
+ @param author: the author of the plugin
+ @type author: Node"""
+
+ self.file = file
+ self.name = name.firstChild.nodeValue.strip()
+ self.author = author.firstChild.nodeValue.strip()
+ self._import = None
+ self.hooks = []
+ self.menus = []
+ self.options = Options()
+
+ self.status = self.STAT_ENABLED
+
+ def parse_hooks (self, hooks):
+ """Gets an <hooks>-elements and parses it.
+
+ @param hooks: the hooks node
+ @type hooks: NodeList"""
+
+ if hooks:
+ for h in hooks[0].getElementsByTagName("hook"):
+ hook = Hook(self, str(h.getAttribute("type")), str(h.getAttribute("call")))
+ hook.parse_connects(h.getElementsByTagName("connect"))
+ self.hooks.append(hook)
+
+ def parse_menus (self, menus):
+ """Get a list of <menu>-elements and parses them.
+
+ @param menus: the menu nodelist
+ @type menus: NodeList"""
+
+ if menus:
+ for item in menus[0].getElementsByTagName("item"):
+ menu = Menu(self, item.firstChild.nodeValue.strip(), str(item.getAttribute("call")))
+ self.menus.append(menu)
+
+ def parse_options (self, options):
+ if options:
+ for o in options:
+ self.options.parse(o.getElementsByTagName("option"))
+
+ self.status = self.STAT_DISABLED if self.options.get("disabled") else self.STAT_ENABLED
+
+ def set_import (self, imports):
+ """This gets a list of imports and parses them - setting the import needed to call the plugin.
+
+ @param imports: list of imports
+ @type imports: NodeList
+
+ @raises PluginImportException: if the plugin's import could not be imported"""
+
+ if imports:
+ self._import = str(imports[0].firstChild.nodeValue.strip())
+
+ try: # try loading
+ mod = __import__(self._import)
+ del mod
+ except ImportError:
+ raise PluginImportException, self._import
+
+ def needs_import (self):
+ """Returns True if an import is required prior to calling the plugin.
+ @rtype: bool"""
+ return self._import is not None
+
+ def get_import (self):
+ """Returns the module to import.
+ @rtype: string"""
+ return self._import
+
+ def get_option(self, name):
+ return self.options.get(name)
+
+ def set_option (self, name, value):
+ return self.options.set(name, value)
+
+ def is_enabled (self):
+ return (self.status in (self.STAT_ENABLED, self.STAT_TEMP_ENABLED))
+
+class PluginQueue:
+ """Class managing and loading the plugins."""
+
+ def __init__ (self, frontend, load = True):
+ """Constructor.
+
+ @param frontend: the frontend used
+ @type frontend: string
+ @param load: if False nothing is loaded
+ @type load: bool"""
+
+ self.frontend = frontend
+ self.list = []
+ self.hooks = {}
+ if load:
+ self._load()
+
+ def get_plugins (self, list_disabled = True):
+ return [x for x in self.list if (x.is_enabled() or list_disabled)]
+
+ def get_plugin_data (self, list_disabled = False):
+ return [(x.name, x.author) for x in self.list if (x.is_enabled() or list_disabled)]
+
+ def get_plugin_menus (self, list_disabled = False):
+ return flatten([x.menus for x in self.list if (x.is_enabled() or list_disabled)])
+
+ def hook (self, hook, *hargs, **hkwargs):
+ """This is a method taking care of calling the plugins.
+
+ B{Example}::
+
+ @pluginQueue.hook("some_hook", data)
+ def function (a, b, c):
+ orig_call(b,c,data)
+
+ def function (a, b, c):
+ hook = pluginQueue.hook("some_hook", data)
+ hook(orig_call)(b,c,data)
+
+ @param hook: the name of the hook
+ @type hook: string"""
+
+ def call (cmd):
+ """Convienience function for calling a connect.
+ @param cmd: the actual Connect
+ @type cmd: Connect"""
+
+ imp = ""
+ if cmd.hook.plugin.needs_import(): # get import
+ imp = cmd.hook.plugin.get_import()
+ try:
+ mod = __import__(imp, globals(), locals(), [cmd.hook.call])
+ except ImportError:
+ error(_("%s cannot be imported."), imp)
+ return
+
+ try:
+ f = eval("mod."+cmd.hook.call) # build function
+ except AttributeError:
+ error(_("%s cannot be imported."), cmd.hook.call)
+ else:
+ try:
+ f = eval(cmd.hook.call)
+ except AttributeError:
+ error(_("%s cannot be imported."), cmd.hook.call)
+
+ return f(*hargs, **hkwargs) # call function
+
+ def hook_decorator (func):
+ """This is the real decorator."""
+
+ if hook in self.hooks:
+ list = self.hooks[hook]
+ else:
+ list = ([],[],[])
+
+ # remove disabled
+ _list = ([],[],[])
+ for i in range(len(list)):
+ for cmd in list[i]:
+ if cmd.hook.plugin.is_enabled():
+ _list[i].append(cmd)
+
+ list = _list
+
+ def wrapper (*args, **kwargs):
+
+ ret = None
+
+ # before
+ for cmd in list[0]:
+ debug(_("Accessing hook '%(hook)s' of plugin '%(plugin)s' (before)."), {"hook" : hook, "plugin": cmd.hook.plugin.name})
+ call(cmd)
+
+ if list[1]: # override
+ info(_("Overriding hook '%(hook)s' with plugin '%(plugin)s'."), {"hook": hook, "plugin": list[1][0].hook.plugin.name})
+ ret = call(list[1][0])
+ else: # normal
+ ret = func(*args, **kwargs)
+
+ # after
+ for cmd in list[2]:
+ debug(_("Accessing hook '%(hook)s' of plugin '%(plugin)s' (after)."), {"hook":hook, "plugin": cmd.hook.plugin.name})
+ call(cmd)
+
+ return ret
+
+ return wrapper
+
+ return hook_decorator
+
+ def _load (self):
+ """Load the plugins."""
+ plugins = filter(lambda x: x.endswith(".xml"), os.listdir(PLUGIN_DIR))
+ plugins = map(lambda x: os.path.join(PLUGIN_DIR, x), plugins)
+ schema = etree.XMLSchema(file = XSD_LOCATION)
+
+ for p in plugins:
+
+ try:
+ schema.assertValid(etree.parse(p))
+ except etree.XMLSyntaxError:
+ error(_("Loading plugin '%s' failed. Invalid XML syntax."), p)
+ continue
+ except etree.DocumentInvalid:
+ error(_("Loading plugin '%s' failed. Plugin does not comply with schema."), p)
+ continue
+
+ doc = parse(p)
+
+ try:
+ list = doc.getElementsByTagName("plugin")
+ elem = list[0]
+
+ frontendOK = None
+ frontends = elem.getElementsByTagName("frontends")
+ if frontends:
+ nodes = frontends[0].childNodes
+ for f in nodes[0].nodeValue.strip().split():
+ if f == self.frontend:
+ frontendOK = True # one positive is enough
+ break
+ elif frontendOK is None: # do not make negative if we already have a positive
+ frontendOK = False
+
+ if frontendOK is None or frontendOK == True:
+ plugin = Plugin(p, elem.getElementsByTagName("name")[0], elem.getElementsByTagName("author")[0])
+ plugin.parse_hooks(elem.getElementsByTagName("hooks"))
+ plugin.set_import(elem.getElementsByTagName("import"))
+ plugin.parse_menus(elem.getElementsByTagName("menu"))
+ plugin.parse_options(elem.getElementsByTagName("options"))
+
+ self.list.append(plugin)
+ info(_("Plugin '%s' loaded."), p)
+
+ except PluginImportException, e:
+ error(_("Loading plugin '%(plugin)s' failed: Could not import %(import)s"), {"plugin": p, "import": e[0]})
+ finally:
+ doc.unlink()
+
+ self._organize()
+
+ def _organize (self):
+ """Creates the lists of connects in a way, that all dependencies are fullfilled."""
+ unresolved_before = {}
+ unresolved_after = {}
+ star_before = {} # should be _before_ all other
+ star_after = {} # should be _after_ all other
+
+ for plugin in self.list: # plugins
+ for hook in plugin.hooks: # hooks in plugin
+ if not hook.hook in self.hooks:
+ self.hooks[hook.hook] = ([], [], [])
+
+ for connect in hook.connects: # connects in hook
+
+ # type="before"
+ if connect.is_before_type():
+ if connect.depend_plugin is None: # no dependency -> straight add
+ self.hooks[hook.hook][0].append(connect)
+ elif connect.depend_plugin == "*":
+ self.hooks[hook.hook][0][0:0] = [connect]
+ elif connect.depend_plugin == "-*":
+ if not hook.hook in star_before:
+ star_before[hook.hook] = []
+
+ star_before[hook.hook].append(connect)
+ else:
+ named = [x.plugin.name for x in self.hooks[hook.hook][0]]
+ if connect.depend_plugin in named:
+ self.hooks[hook.hook][0].insert(named.index(connect.depend_plugin), connect)
+ else:
+ if not hook.hook in unresolved_before:
+ unresolved_before[hook.hook] = []
+
+ unresolved_before[hook.hook].append(connect)
+
+ # type = "after"
+ elif connect.is_after_type():
+ if connect.depend_plugin is None: # no dependency -> straight add
+ self.hooks[hook.hook][2].append(connect)
+ elif connect.depend_plugin == "*":
+ if not hook.hook in star_after:
+ star_after[hook.hook] = []
+
+ star_after[hook.hook].append(connect)
+ elif connect.depend_plugin == "-*":
+ self.hooks[hook.hook][2][0:0] = [connect]
+ else:
+ named = [x.hook.plugin.name for x in self.hooks[hook.hook][2]]
+ if connect.depend_plugin in named:
+ self.hooks[hook.hook][2].insert(named.index(connect.depend_plugin)+1, connect)
+ else:
+ if not hook.hook in unresolved_after:
+ unresolved_after[hook.hook] = []
+
+ unresolved_after[hook.hook].append(connect)
+
+ # type = "override"
+ elif connect.is_override_type():
+ if self.hooks[hook.hook][1]:
+ warning(_("For hook '%(hook)s' an override is already defined by plugin '%(plugin)s'!"), {"hook": hook.hook, "plugin": self.hooks[hook.hook][1][0]})
+
+ self.hooks[hook.hook][1][:1] = [connect]
+ continue
+
+ self._resolve_unresolved(unresolved_before, unresolved_after)
+
+ for hook in star_before:
+ self.hooks[hook][0].extend(star_before[hook]) # append the list
+
+ for hook in star_after:
+ self.hooks[hook][2].extend(star_after[hook]) # append the list
+
+
+ def _resolve_unresolved (self, before, after):
+ def resolve(hook, list, idx, add):
+ if not list:
+ return
+
+ changed = False
+ for connect in list[:]:
+ named = [x.plugin.name for x in self.hooks[hook][idx]]
+ if connect.depend_plugin in named:
+ changed = True
+ self.hooks[hook][idx].insert(named.index(connect.depend_plugin)+add, connect)
+ list.remove(connect)
+
+ if changed:
+ resolve(hook, list, idx, add)
+
+ for l in list:
+ warning("Command for hook '%(hook)s' in plugin '%(plugin)s' could not be added due to missing dependant: '%(dep)s'!", {"hook": hook, "plugin": l.hook.plugin.name, "dep": l.depend_plugin})
+
+ for hook in before:
+ resolve(hook, before[hook], 0, 0)
+
+ for hook in after:
+ resolve(hook, after[hook], 2, 1)
+
+
+__plugins = None
+
+def load_plugins(frontend):
+ """Loads the plugins for a given frontend.
+ @param frontend: The frontend. See L{constants.FRONTENDS} for the correct list of values.
+ @type frontend: string"""
+
+ global __plugins
+ if __plugins is None or __plugins.frontend != frontend:
+ __plugins = PluginQueue(frontend)
+
+def get_plugin_queue():
+ """Returns the actual L{PluginQueue}. If it is C{None}, they are not being loaded yet.
+
+ @returns: the actual L{PluginQueue} or C{None}
+ @rtype: PluginQueue"""
+ return __plugins
+
+def hook(hook, *args, **kwargs):
+ if __plugins is None:
+ def pseudo_decorator(f):
+ return f
+ return pseudo_decorator
+ else:
+ return __plugins.hook(hook, *args, **kwargs)