fix lambda endpoint parsing (#1395)

* fix endpoint parsing

* add new unittest

* finish test

moto/awslambda/models.py

@@ -603,7 +603,7 @@ class LambdaBackend(BaseBackend):
     def list_functions(self):
         return self._lambdas.all()
 
-    def send_message(self, function_name, message, subject=None):
+    def send_message(self, function_name, message, subject=None, qualifier=None):
         event = {
             "Records": [
                 {
@@ -636,8 +636,8 @@ class LambdaBackend(BaseBackend):
             ]
 
         }
-        self._functions[function_name][-1].invoke(json.dumps(event), {}, {})
-        pass
+        func = self._lambdas.get_function(function_name, qualifier)
+        func.invoke(json.dumps(event), {}, {})
 
     def list_tags(self, resource):
         return self.get_function_by_arn(resource).tags

moto/sns/models.py

@@ -100,9 +100,21 @@ class Subscription(BaseModel):
             requests.post(self.endpoint, json=post_data)
         elif self.protocol == 'lambda':
             # TODO: support bad function name
-            function_name = self.endpoint.split(":")[-1]
-            region = self.arn.split(':')[3]
-            lambda_backends[region].send_message(function_name, message, subject=subject)
+            # http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html
+            arr = self.endpoint.split(":")
+            region = arr[3]
+            qualifier = None
+            if len(arr) == 7:
+                assert arr[5] == 'function'
+                function_name = arr[-1]
+            elif len(arr) == 8:
+                assert arr[5] == 'function'
+                qualifier = arr[-1]
+                function_name = arr[-2]
+            else:
+                assert False
+
+            lambda_backends[region].send_message(function_name, message, subject=subject, qualifier=qualifier)
 
     def _matches_filter_policy(self, message_attributes):
         # TODO: support Anything-but matching, prefix matching and