[ckan#1200] add loaded plugin logic

ckan/plugins/core.py

@@ -18,7 +18,7 @@
     'PluginNotFoundException', 'Plugin', 'SingletonPlugin',
     'load', 'load_all', 'unload', 'unload_all',
     'get_plugin', 'plugins_update',
-    'use_plugin',
+    'use_plugin', 'plugin_loaded',
 ]
 
 log = logging.getLogger(__name__)
@@ -210,6 +210,15 @@ def unload(*plugins):
     plugins_update()
 
 
+def plugin_loaded(name):
+    '''
+    See if a particular plugin is loaded.
+    '''
+    if name in _PLUGINS:
+        return True
+    return False
+
+
 def find_system_plugins():
     '''
     Return all plugins in the ckan.system_plugins entry point group.

ckanext/datastore/logic/action.py

@@ -96,7 +96,7 @@ def datastore_create(context, data_dict):
 
         # create resource from file
         if has_url:
-            if not 'datapusher' in pylons.config.get('ckan.plugins', ''):
+            if not p.plugin_loaded('datapusher'):
                 raise p.toolkit.ValidationError({'resource': [
                     'The datapusher has to be enabled.']})
             p.toolkit.get_action('datapusher_submit')(context, {