[#482] Add get_validator() and get_converter() functions to plugins.t…

…oolkit

ckan/logic/__init__.py

@@ -381,3 +381,65 @@ def wrapper(context, data_dict):
     wrapper.side_effect_free = True
 
     return wrapper
+
+
+class UnknownValidator(Exception):
+    pass
+
+
+_validators_cache = {}
+
+def clear_validators_cache():
+    _validators_cache.clear()
+
+
+def get_validator(validator):
+    if  not _validators_cache:
+        # find validators
+        import ckan.lib.navl.validators as validators
+        for k, v in validators.__dict__.items():
+            try:
+                if v.__module__ != 'ckan.lib.navl.validators':
+                    continue
+                _validators_cache[k] = v
+            except AttributeError:
+                pass
+
+        import ckan.logic.validators as validators
+        for k, v in validators.__dict__.items():
+            try:
+                if v.__module__ != 'ckan.logic.validators':
+                    continue
+                _validators_cache[k] = v
+            except AttributeError:
+                pass
+    try:
+        return _validators_cache[validator]
+    except KeyError:
+        raise UnknownValidator('Validator `%s` does not exist' % validator)
+
+
+class UnknownConverter(Exception):
+    pass
+
+
+_converters_cache = {}
+
+def clear_converters_cache():
+    _converters_cache.clear()
+
+
+def get_converter(converter):
+    if  not _converters_cache:
+        import ckan.logic.converters as converters
+        for k, v in converters.__dict__.items():
+            try:
+                if v.__module__ != 'ckan.logic.converters':
+                    continue
+                _converters_cache[k] = v
+            except AttributeError:
+                pass
+    try:
+        return _converters_cache[converter]
+    except KeyError:
+        raise UnknownConverter('Converter `%s` does not exist' % converter)

ckan/plugins/toolkit.py

@@ -41,10 +41,14 @@ class _Toolkit(object):
         'aslist',               # converts an object to a list
         'literal',              # stop tags in a string being escaped
         'get_action',           # get logic action function
+        'get_converter',        # get validator function
+        'get_validator',        # get convertor action function
         'check_access',         # check logic function authorisation
         'ObjectNotFound',       # action not found exception
                                 # (ckan.logic.NotFound)
         'NotAuthorized',        # action not authorized exception
+        'UnknownConverter',     # convertor not found exception
+        'UnknownValidator',     # validator not found exception
         'ValidationError',      # model update validation error
         'CkanCommand',          # class for providing cli interfaces
 
@@ -87,10 +91,14 @@ def _initialize(self):
         t['literal'] = webhelpers.html.tags.literal
 
         t['get_action'] = logic.get_action
+        t['get_converter'] = logic.get_converter
+        t['get_validator'] = logic.get_validator
         t['check_access'] = logic.check_access
         t['ObjectNotFound'] = logic.NotFound  # Name change intentional
         t['NotAuthorized'] = logic.NotAuthorized
         t['ValidationError'] = logic.ValidationError
+        t['UnknownConverter'] = logic.UnknownConverter
+        t['UnknownValidator'] = logic.UnknownValidator
 
         t['CkanCommand'] = cli.CkanCommand