Instantiate callback plugins only once so we can set play/task objects on them and they'll stick.

lib/ansible/callbacks.py

@@ -45,10 +45,25 @@ if cowsay and noncow == 'random':
     cows = out.split()
     cows.append(False)
     noncow = random.choice(cows)
+    
+callback_plugins = [x for x in utils.plugins.callback_loader.all()]
+
+def set_play(callback, play):
+    ''' used to notify callback plugins of context '''
+    callback.play = play
+    for callback_plugin in callback_plugins:
+        callback_plugin.play = play
+
+def set_task(callback, task):
+    ''' used to notify callback plugins of context '''
+    callback.task = task
+    for callback_plugin in callback_plugins:
+        callback_plugin.task = task
+
 
 def call_callback_module(method_name, *args, **kwargs):
 
-    for callback_plugin in utils.plugins.callback_loader.all():
+    for callback_plugin in callback_plugins:
         methods = [
             getattr(callback_plugin, method_name, None),
             getattr(callback_plugin, 'on_any', None)

lib/ansible/playbook/__init__.py

@@ -16,8 +16,8 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
 import ansible.inventory
-import ansible.runner
 import ansible.constants as C
+import ansible.runner
 from ansible.utils import template
 from ansible import utils
 from ansible import errors
@@ -214,8 +214,9 @@ class PlayBook(object):
         for (play_ds, play_basedir) in zip(self.playbook, self.play_basedirs):
             play = Play(self, play_ds, play_basedir)
 
-            self.callbacks.play = play
-            self.runner_callbacks.play = play
+            assert play is not None
+            ansible.callbacks.set_play(self.callbacks, play)
+            ansible.callbacks.set_play(self.runner_callbacks, play)
             
             matched_tags, unmatched_tags = play.compare_tags(self.only_tags)
             matched_tags_all = matched_tags_all | matched_tags
@@ -317,8 +318,8 @@ class PlayBook(object):
     def _run_task(self, play, task, is_handler):
         ''' run a single task in the playbook and recursively run any subtasks.  '''
 
-        self.callbacks.task = task
-        self.runner_callbacks.task = task
+        ansible.callbacks.set_task(self.callbacks, task)
+        ansible.callbacks.set_task(self.runner_callbacks, task)
 
         self.callbacks.on_task_start(template.template(play.basedir, task.name, task.module_vars, lookup_fatal=False), is_handler)
         if hasattr(self.callbacks, 'skip_task') and self.callbacks.skip_task:
@@ -402,8 +403,8 @@ class PlayBook(object):
         self.callbacks.on_setup()
         self.inventory.restrict_to(host_list)
         
-        self.callbacks.task = None
-        self.runner_callbacks.task = None
+        ansible.callbacks.set_task(self.callbacks, None)
+        ansible.callbacks.set_task(self.runner_callbacks, None)
 
         # push any variables down to the system
         setup_results = ansible.runner.Runner(

lib/ansible/utils/plugins.py

@@ -22,6 +22,7 @@ import imp
 import ansible.constants as C
 from ansible import errors
 
+MODULE_CACHE = {}
 _basedirs = []
 
 def push_basedir(basedir):
@@ -41,7 +42,11 @@ class PluginLoader(object):
         self.config = config
         self.subdir = subdir
         self.aliases = aliases
-        self._module_cache = {}
+ 
+        if not class_name in MODULE_CACHE:
+            MODULE_CACHE[class_name] = {}
+
+        self._module_cache = MODULE_CACHE[class_name]
         self._extra_dirs = []
 
     def _get_package_path(self):
@@ -111,6 +116,7 @@ class PluginLoader(object):
         return getattr(self._module_cache[path], self.class_name)(*args, **kwargs)
 
     def all(self, *args, **kwargs):
+       
         for i in self._get_paths():
             for path in glob.glob(os.path.join(i, "*.py")):
                 name, ext = os.path.splitext(os.path.basename(path))
@@ -120,10 +126,54 @@ class PluginLoader(object):
                     self._module_cache[path] = imp.load_source('.'.join([self.package, name]), path)
                 yield getattr(self._module_cache[path], self.class_name)(*args, **kwargs)
 
-action_loader     = PluginLoader('ActionModule',   'ansible.runner.action_plugins',     C.DEFAULT_ACTION_PLUGIN_PATH,     'action_plugins')
-callback_loader   = PluginLoader('CallbackModule', 'ansible.callback_plugins',          C.DEFAULT_CALLBACK_PLUGIN_PATH,   'callback_plugins')
-connection_loader = PluginLoader('Connection',     'ansible.runner.connection_plugins', C.DEFAULT_CONNECTION_PLUGIN_PATH, 'connection_plugins', aliases={'paramiko': 'paramiko_ssh'})
-module_finder     = PluginLoader('',               '',                                  C.DEFAULT_MODULE_PATH,            'library')
-lookup_loader     = PluginLoader('LookupModule',   'ansible.runner.lookup_plugins',     C.DEFAULT_LOOKUP_PLUGIN_PATH,     'lookup_plugins')
-vars_loader       = PluginLoader('VarsModule',     'ansible.inventory.vars_plugins',    C.DEFAULT_VARS_PLUGIN_PATH,       'vars_plugins')
-filter_loader     = PluginLoader('FilterModule',   'ansible.runner.filter_plugins',     C.DEFAULT_FILTER_PLUGIN_PATH,     'filter_plugins')
+action_loader = PluginLoader(
+    'ActionModule',   
+    'ansible.runner.action_plugins',
+    C.DEFAULT_ACTION_PLUGIN_PATH,
+    'action_plugins'
+)
+
+callback_loader = PluginLoader(
+    'CallbackModule', 
+    'ansible.callback_plugins', 
+    C.DEFAULT_CALLBACK_PLUGIN_PATH, 
+    'callback_plugins'
+)
+
+connection_loader = PluginLoader(
+    'Connection', 
+    'ansible.runner.connection_plugins', 
+    C.DEFAULT_CONNECTION_PLUGIN_PATH, 
+    'connection_plugins', 
+    aliases={'paramiko': 'paramiko_ssh'}
+)
+
+module_finder = PluginLoader(
+    '', 
+    '', 
+    C.DEFAULT_MODULE_PATH, 
+    'library'
+)
+
+lookup_loader = PluginLoader(
+    'LookupModule',   
+    'ansible.runner.lookup_plugins', 
+    C.DEFAULT_LOOKUP_PLUGIN_PATH, 
+    'lookup_plugins'
+)
+
+vars_loader = PluginLoader(
+    'VarsModule', 
+    'ansible.inventory.vars_plugins', 
+    C.DEFAULT_VARS_PLUGIN_PATH, 
+    'vars_plugins'
+)
+
+filter_loader = PluginLoader(
+    'FilterModule', 
+    'ansible.runner.filter_plugins', 
+    C.DEFAULT_FILTER_PLUGIN_PATH, 
+    'filter_plugins'
+)
+
+

plugins/callbacks/context_demo.py

@@ -0,0 +1,31 @@
+# (C) 2012, Michael DeHaan, <michael.dehaan@gmail.com>
+
+# This file is part of Ansible
+#
+# Ansible 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.
+#
+# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import time
+import json
+
+class CallbackModule(object):
+    """
+    This is a very trivial example of how any callback function can get at play and task objects.
+    play will be 'None' for runner invocations, and task will be None for 'setup' invocations.
+    """
+
+    def on_any(self, *args, **kwargs):
+        play = getattr(self, 'play', None)
+        task = getattr(self, 'task', None)
+        print "play = %s, task = %s, args = %s, kwargs = %s" % (play,task,args,kwargs)