Instantiate filter plugins only once to save some efficiency.

lib/ansible/utils/template.py

@@ -29,6 +29,25 @@ import subprocess
 import datetime
 import pwd
 
+class Globals(object):
+    FILTERS = None
+    def __init__(self):
+        pass    
+
+def _get_filters():
+   ''' return filter plugin instances '''
+
+   if Globals.FILTERS is not None:
+       return Globals.FILTERS
+
+   from ansible import utils
+   plugins = [ x for x in utils.plugins.filter_loader.all()]
+   filters = {}
+   for fp in plugins:
+       filters.update(fp.filters())
+   Globals.FILTERS = filters
+ 
+   return Globals.FILTERS
 
 class Flags:
     LEGACY_TEMPLATE_WARNING = False
@@ -365,12 +384,9 @@ def template_from_file(basedir, path, vars):
         return lookup(*args, basedir=basedir, **kwargs)
 
     environment = jinja2.Environment(loader=loader, trim_blocks=True, extensions=jinja_exts)
-    for filter_plugin in utils.plugins.filter_loader.all():
-        filters = filter_plugin.filters()
-        if not isinstance(filters, dict):
-            raise errors.AnsibleError("FilterModule.filters should return a dict.")
-        environment.filters.update(filters)
-        environment.globals['lookup'] = my_lookup
+    environment.filters.update(_get_filters())
+    environment.globals['lookup'] = my_lookup
+
     try:
         data = codecs.open(realpath, encoding="utf8").read()
     except UnicodeDecodeError:
@@ -421,21 +437,6 @@ def template_from_file(basedir, path, vars):
         res = res + '\n'
     return template(basedir, res, vars)
 
-def _get_filter_plugins():
-
-    global FILTER_PLUGINS
-    if FILTER_PLUGINS is not None:
-        return FILTER_PLUGINS
-    FILTER_PLUGINS = {}
-    from ansible import utils
-    for filter_plugin in utils.plugins.filter_loader.all():
-        filters = filter_plugin.filters()
-        if not isinstance(filters, dict):
-            raise errors.AnsibleError("FilterModule.filters should return a dict.")
-        FILTER_PLUGINS.update(filters)
-    return FILTER_PLUGINS
-        
-
 def _smush_braces(data):
     ''' smush Jinaj2 braces so unresolved templates like {{ foo }} don't get parsed weird by key=value code '''
     while data.find('{{ ') != -1:
@@ -453,7 +454,7 @@ def template_from_string(basedir, data, vars):
         if type(data) == str:
             data = unicode(data, 'utf-8')
         environment = jinja2.Environment(trim_blocks=True, undefined=StrictUndefined) 
-        environment.filters.update(_get_filter_plugins())
+        environment.filters.update(_get_filters())
         environment.template_class = J2Template
 
         # TODO: may need some way of using lookup plugins here seeing we aren't calling