1 | """ |
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2 | The pluginmanager module cares about the management of plugin status and their changes between status. |
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3 | |||
4 | There are two manager classes for managing plugin related objects. |
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5 | |||
6 | * PluginManager: Cares about initialised Plugins, which can be activated and deactivated. |
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7 | * PluginClassManager: Cares about plugin classes, which are used to create plugins. |
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8 | |||
9 | A plugin class can be reused for several plugins. The only thing to care about is the naming of a plugin. |
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10 | This plugin name must be unique inside a groundwork app and can be set during plugin initialisation/activation. |
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11 | """ |
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12 | from __future__ import absolute_import |
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13 | from future.utils import raise_from |
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14 | from pkg_resources import iter_entry_points |
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15 | import logging |
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16 | import inspect |
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17 | import sys |
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18 | |||
19 | from groundwork.patterns import GwBasePattern |
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20 | from groundwork.exceptions import PluginNotActivatableException, PluginNotInitialisableException, \ |
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21 | PluginRegistrationException, PluginNotDeactivatableException |
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22 | |||
23 | |||
24 | class PluginManager: |
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25 | """ |
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26 | PluginManager for searching, initialising, activating and deactivating groundwork plugins. |
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27 | """ |
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28 | |||
29 | def __init__(self, app): |
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30 | """ |
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31 | Initialises the plugin manager. |
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32 | |||
33 | Additional plugins can be registered by adding their class via the plugins argument. |
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34 | |||
35 | :param app: groundwork application object |
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36 | :param strict: If True, problems during plugin registration/initialisation or activation will throw an exception |
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37 | """ |
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38 | self._log = logging.getLogger(__name__) |
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39 | self._app = app |
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40 | self._plugins = {} |
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41 | |||
42 | #: Instance of :class:`~groundwork.pluginmanager.PluginClassManager`. |
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43 | #: Handles the registration of plugin classes, which can be used to create new plugins during runtime. |
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44 | self.classes = PluginClassManager(self._app) |
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45 | |||
46 | def initialise_by_names(self, plugins=None): |
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47 | """ |
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48 | Initialises given plugins, but does not activate them. |
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49 | |||
50 | This is needed to import and configure libraries, which are imported by used patterns, like GwFlask. |
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51 | |||
52 | After this action, all needed python modules are imported and configured. |
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53 | Also the groundwork application object is ready and contains functions and objects, which were added |
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54 | by patterns, like app.commands from GwCommandsPattern. |
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55 | |||
56 | The class of a given plugin must already be registered in the :class:`.PluginClassManager`. |
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57 | |||
58 | :param plugins: List of plugin names |
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59 | :type plugins: list of strings |
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60 | """ |
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61 | |||
62 | if plugins is None: |
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63 | plugins = [] |
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64 | |||
65 | self._log.debug("Plugins Initialisation started") |
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66 | if not isinstance(plugins, list): |
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67 | raise AttributeError("plugins must be a list, not %s" % type(plugins)) |
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68 | |||
69 | self._log.debug("Plugins to initialise: %s" % ", ".join(plugins)) |
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70 | plugin_initialised = [] |
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71 | for plugin_name in plugins: |
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72 | if not isinstance(plugin_name, str): |
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73 | raise AttributeError("plugin name must be a str, not %s" % type(plugin_name)) |
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74 | |||
75 | plugin_class = self.classes.get(plugin_name) |
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76 | self.initialise(plugin_class.clazz, plugin_name) |
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77 | plugin_initialised.append(plugin_name) |
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78 | |||
79 | self._log.info("Plugins initialised: %s" % ", ".join(plugin_initialised)) |
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80 | |||
81 | def initialise(self, clazz, name=None): |
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82 | if clazz is not None and issubclass(clazz, GwBasePattern): |
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83 | if name is None: |
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84 | name = clazz.__name__ |
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85 | try: |
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86 | # Plugin Initialisation |
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87 | plugin_instance = clazz(app=self._app, name=name) |
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88 | # Let's be sure the correct name was set. Even if the init_routine of |
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89 | # the plugin does not support the name parameter. |
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90 | if plugin_instance.name != name: |
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91 | plugin_instance.name = name |
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92 | except Exception as e: |
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93 | self._log.warning("Plugin class %s could not be initialised" % clazz.__name__) |
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94 | if self._app.strict: |
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95 | error = "Plugin class %s could not be initialised: %s" % (clazz.__name__, e.message) |
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96 | if sys.version_info[0] < 3: |
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97 | error += "Reason: %s" % e |
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98 | raise_from(PluginNotInitialisableException(error), e) |
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99 | |||
100 | # Let's be sure, that GwBasePattern got called |
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101 | if not hasattr(plugin_instance, "_plugin_base_initialised") \ |
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102 | or plugin_instance._plugin_base_initialised is not True: |
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103 | self._log.error("GwBasePattern.__init__() was not called during initialisation. " |
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104 | "Please add 'super(*args, **kwargs).__init__()' to the top of all involved " |
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105 | "plugin/pattern init routines." |
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106 | "Activate logging debug-output to see all involved classes.") |
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107 | for mro_class in clazz.__mro__: |
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108 | self._log.debug(mro_class) |
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109 | raise Exception("GwBasePattern.__init()__ was not called during initialisation.") |
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110 | self._register_initialisation(plugin_instance) |
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111 | self._log.debug("Plugin %s initialised" % name) |
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112 | return plugin_instance |
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113 | |||
114 | if clazz is None: |
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115 | self._log.warn("Plugin class %s not found" % clazz.__name__) |
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116 | return None |
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117 | |||
118 | if not issubclass(clazz, GwBasePattern): |
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119 | self._log.warn("Can not load %s. Plugin is not based on groundwork.Plugin." % clazz.__name__) |
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120 | if self._app.strict: |
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121 | raise Exception("Can not load %s. Plugin is not based on groundwork.Plugin." % clazz.__name__) |
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122 | return None |
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123 | |||
124 | def _register_initialisation(self, plugin_instance): |
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125 | """ |
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126 | Internal functions to perform registration actions after plugin load was successful. |
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127 | """ |
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128 | self._plugins[plugin_instance.name] = plugin_instance |
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129 | |||
130 | def activate(self, plugins=[]): |
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131 | """ |
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132 | Activates given plugins. |
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133 | |||
134 | This calls mainly plugin.activate() and plugins register needed resources like commands, signals or |
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135 | documents. |
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136 | |||
137 | If given plugins have not been initialised, this is also done via :func:`_load`. |
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138 | |||
139 | :param plugins: List of plugin names |
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140 | :type plugins: list of strings |
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141 | """ |
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142 | self._log.debug("Plugins Activation started") |
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143 | |||
144 | if not isinstance(plugins, list): |
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145 | raise AttributeError("plugins must be a list, not %s" % type(plugins)) |
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146 | |||
147 | self._log.debug("Plugins to activate: %s" % ", ".join(plugins)) |
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148 | |||
149 | plugins_activated = [] |
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150 | for plugin_name in plugins: |
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151 | if not isinstance(plugin_name, str): |
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152 | raise AttributeError("plugin name must be a str, not %s" % type(plugin_name)) |
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153 | |||
154 | if plugin_name not in self._plugins.keys() and plugin_name in self.classes._classes.keys(): |
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155 | self._log.debug("Initialisation needed before activation.") |
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156 | try: |
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157 | self.initialise_by_names([plugin_name]) |
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158 | except Exception as e: |
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159 | self._log.error("Couldn't initialise plugin %s" % plugin_name) |
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160 | if self._app.strict: |
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161 | error = "Couldn't initialise plugin %s" % plugin_name |
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162 | if sys.version_info[0] < 3: |
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163 | error += "Reason: %s" % e |
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164 | raise_from(Exception(error), e) |
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165 | else: |
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166 | continue |
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167 | View Code Duplication | if plugin_name in self._plugins.keys(): |
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168 | self._log.debug("Activating plugin %s" % plugin_name) |
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169 | if not self._plugins[plugin_name].active: |
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170 | try: |
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171 | self._plugins[plugin_name].activate() |
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172 | except Exception as e: |
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173 | raise_from( |
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174 | PluginNotActivatableException("Plugin %s could not be activated: %s" % (plugin_name, |
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175 | e)), e) |
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176 | else: |
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177 | self._log.debug("Plugin %s activated" % plugin_name) |
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178 | plugins_activated.append(plugin_name) |
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179 | else: |
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180 | self._log.warning("Plugin %s got already activated." % plugin_name) |
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181 | if self._app.strict: |
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182 | raise PluginNotInitialisableException() |
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183 | |||
184 | self._log.info("Plugins activated: %s" % ", ".join(plugins_activated)) |
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185 | |||
186 | def deactivate(self, plugins=[]): |
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187 | """ |
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188 | Deactivates given plugins. |
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189 | |||
190 | A given plugin must be activated, otherwise it is ignored and no action takes place (no signals are fired, |
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191 | no deactivate functions are called.) |
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192 | |||
193 | A deactivated plugin is still loaded and initialised and can be reactivated by calling :func:`activate` again. |
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194 | It is also still registered in the :class:`.PluginManager` and can be requested via :func:`get`. |
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195 | |||
196 | :param plugins: List of plugin names |
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197 | :type plugins: list of strings |
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198 | """ |
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199 | self._log.debug("Plugins Deactivation started") |
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200 | |||
201 | if not isinstance(plugins, list): |
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202 | raise AttributeError("plugins must be a list, not %s" % type(plugins)) |
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203 | |||
204 | self._log.debug("Plugins to deactivate: %s" % ", ".join(plugins)) |
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205 | |||
206 | plugins_deactivated = [] |
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207 | for plugin_name in plugins: |
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208 | if not isinstance(plugin_name, str): |
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209 | raise AttributeError("plugin name must be a str, not %s" % type(plugin_name)) |
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210 | |||
211 | View Code Duplication | if plugin_name not in self._plugins.keys(): |
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212 | self._log.info("Unknown activated plugin %s" % plugin_name) |
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213 | continue |
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214 | else: |
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215 | self._log.debug("Deactivating plugin %s" % plugin_name) |
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216 | if not self._plugins[plugin_name].active: |
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217 | self._log.warning("Plugin %s seems to be already deactivated" % plugin_name) |
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218 | else: |
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219 | try: |
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220 | self._plugins[plugin_name].deactivate() |
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221 | except Exception as e: |
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222 | raise_from( |
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223 | PluginNotDeactivatableException("Plugin %s could not be deactivated" % plugin_name), e) |
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224 | else: |
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225 | self._log.debug("Plugin %s deactivated" % plugin_name) |
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226 | plugins_deactivated.append(plugin_name) |
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227 | |||
228 | self._log.info("Plugins deactivated: %s" % ", ".join(plugins_deactivated)) |
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229 | |||
230 | def get(self, name=None): |
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231 | """ |
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232 | Returns the plugin object with the given name. |
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233 | Or if a name is not given, the complete plugin dictionary is returned. |
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234 | |||
235 | :param name: Name of a plugin |
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236 | :return: None, single plugin or dictionary of plugins |
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237 | """ |
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238 | if name is None: |
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239 | return self._plugins |
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240 | else: |
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241 | if name not in self._plugins.keys(): |
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242 | return None |
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243 | else: |
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244 | return self._plugins[name] |
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245 | |||
246 | def exist(self, name): |
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247 | """ |
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248 | Returns True if plugin exists. |
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249 | :param name: plugin name |
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250 | :return: boolean |
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251 | """ |
||
252 | if name in self._plugins.keys(): |
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253 | return True |
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254 | return False |
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255 | |||
256 | def is_active(self, name): |
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257 | """ |
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258 | Returns True if plugin exists and is active. |
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259 | If plugin does not exist, it returns None |
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260 | |||
261 | :param name: plugin name |
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262 | :return: boolean or None |
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263 | """ |
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264 | if name in self._plugins.keys(): |
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265 | return self._plugins["name"].active |
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266 | return None |
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267 | |||
268 | |||
269 | class PluginClassManager: |
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270 | """ |
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271 | Manages the plugin classes, which can be used to initialise and activate new plugins. |
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272 | |||
273 | Loads all plugin classes from entry_point "groundwork.plugin" automatically during own initialisation. |
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274 | Provides functions to register new plugin classes during runtime. |
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275 | """ |
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276 | |||
277 | def __init__(self, app): |
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278 | self._log = logging.getLogger(__name__) |
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279 | self._app = app |
||
280 | self._classes = {} |
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281 | self._get_plugins_by_entry_points() |
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282 | |||
283 | def _get_plugins_by_entry_points(self): |
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284 | """ |
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285 | Registers plugin classes, which are in sys.path and have an entry_point called 'groundwork.plugin'. |
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286 | :return: dict of plugin classes |
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287 | """ |
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288 | # Let's find and register every plugin, which is in sys.path and has defined a entry_point 'groundwork.plugin' |
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289 | # in it's setup.py |
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290 | entry_points = [] |
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291 | classes = {} |
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292 | for entry_point in iter_entry_points(group='groundwork.plugin', name=None): |
||
293 | entry_points.append(entry_point) |
||
294 | |||
295 | for entry_point in entry_points: |
||
296 | try: |
||
297 | entry_point_object = entry_point.load() |
||
298 | except Exception as e: |
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299 | # We should not throw an exception now, because a package/entry_point can be outdated, using an old |
||
300 | # api from groundwork, tries to import unavailable packages, what ever... |
||
301 | # We just do not make it available. That's all we can do. |
||
302 | self._log.debug("Couldn't load entry_point %s. Reason: %s" % (entry_point.name, e)) |
||
303 | continue |
||
304 | |||
305 | if not issubclass(entry_point_object, GwBasePattern): |
||
306 | self._log.warning("entry_point %s is not a subclass of groundworkPlugin" % entry_point.name) |
||
307 | continue |
||
308 | plugin_name = entry_point_object.__name__ |
||
309 | |||
310 | plugin_class = self.register_class(entry_point_object, plugin_name, |
||
311 | entrypoint_name=entry_point.name, |
||
312 | distribution_path=entry_point.dist.location, |
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313 | distribution_key=entry_point.dist.key, |
||
314 | distribution_version=entry_point.dist.version) |
||
315 | |||
316 | classes[plugin_name] = plugin_class |
||
317 | # classes[plugin_name] = { |
||
318 | # "name": plugin_name, |
||
319 | # "entry_point": entry_point.name, |
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320 | # "path": entry_point.dist.location, |
||
321 | # "class": entry_point_object, |
||
322 | # "distribution": { |
||
323 | # "key": entry_point.dist.key, |
||
324 | # "version": entry_point.dist.version |
||
325 | # }, |
||
326 | # } |
||
327 | self._log.debug("Found plugin: %s at entry_point %s of package %s (%s)" % (plugin_name, entry_point.name, |
||
328 | entry_point.dist.key, |
||
329 | entry_point.dist.version)) |
||
330 | return classes |
||
331 | |||
332 | def register(self, classes=[]): |
||
333 | """ |
||
334 | Registers new plugins. |
||
335 | |||
336 | The registration only creates a new entry for a plugin inside the _classes dictionary. |
||
337 | It does not activate or even initialise the plugin. |
||
338 | |||
339 | A plugin must be a class, which inherits directly or indirectly from GwBasePattern. |
||
340 | |||
341 | :param classes: List of plugin classes |
||
342 | :type classes: list |
||
343 | """ |
||
344 | if not isinstance(classes, list): |
||
345 | raise AttributeError("plugins must be a list, not %s." % type(classes)) |
||
346 | |||
347 | plugin_registered = [] |
||
348 | |||
349 | for plugin_class in classes: |
||
350 | plugin_name = plugin_class.__name__ |
||
351 | self.register_class(plugin_class, plugin_name) |
||
352 | self._log.debug("Plugin %s registered" % plugin_name) |
||
353 | plugin_registered.append(plugin_name) |
||
354 | |||
355 | self._log.info("Plugins registered: %s" % ", ".join(plugin_registered)) |
||
356 | |||
357 | def register_class(self, clazz, name=None, entrypoint_name=None, distribution_path=None, |
||
358 | distribution_key=None, distribution_version=None): |
||
359 | |||
360 | if name is None: |
||
361 | name = clazz.__name__ |
||
362 | |||
363 | if not inspect.isclass(clazz) or not issubclass(clazz, GwBasePattern): |
||
364 | self._log.error("Given plugin is not a subclass of groundworkPlugin.") |
||
365 | if self._app.strict: |
||
366 | raise AttributeError("Given plugin is not a subclass of groundworkPlugin.") |
||
367 | |||
368 | if isinstance(clazz, GwBasePattern): |
||
369 | self._log.error("Given plugin %s is already initialised. Please provide a class not an instance.") |
||
370 | if self._app.strict: |
||
371 | raise Exception("Given plugin %s is already initialised. Please provide a class not an instance.") |
||
372 | |||
373 | if name in self._classes.keys(): |
||
374 | self._log.warning("Plugin %s already registered" % name) |
||
375 | if self._app.strict: |
||
376 | raise PluginRegistrationException("Plugin %s already registered" % name) |
||
377 | |||
378 | self._classes[name] = PluginClass(name, clazz, entrypoint_name, distribution_path, |
||
379 | distribution_key, distribution_version) |
||
380 | |||
381 | return self._classes[name] |
||
382 | |||
383 | # self._classes[name] = { |
||
384 | # "name": plugin_name, |
||
385 | # "entry_point": None, |
||
386 | # "path": None, |
||
387 | # "class": plugin, |
||
388 | # "distribution": None, |
||
389 | # } |
||
390 | |||
391 | def get(self, name=None): |
||
392 | """ |
||
393 | Returns the plugin class object with the given name. |
||
394 | Or if a name is not given, the complete plugin dictionary is returned. |
||
395 | |||
396 | :param name: Name of a plugin |
||
397 | :return: None, single plugin or dictionary of plugins |
||
398 | """ |
||
399 | if name is None: |
||
400 | return self._classes |
||
401 | else: |
||
402 | if name not in self._classes.keys(): |
||
403 | return None |
||
404 | else: |
||
405 | return self._classes[name] |
||
406 | |||
407 | def exist(self, name): |
||
408 | """ |
||
409 | Returns True if plugin class exists. |
||
410 | :param name: plugin name |
||
411 | :return: boolean |
||
412 | """ |
||
413 | if name in self._classes.keys(): |
||
414 | return True |
||
415 | return False |
||
416 | |||
417 | |||
418 | class PluginClass: |
||
419 | def __init__(self, name, clazz, entrypoint_name, distribution_path, distribution_key, distribution_version): |
||
420 | self.name = name |
||
421 | self.entrypoint_name = entrypoint_name |
||
422 | self.clazz = clazz |
||
423 | self.distribution = { |
||
424 | "path": distribution_path, |
||
425 | "key": distribution_key, |
||
426 | "version": distribution_version |
||
427 | } |
||
428 |