Handle / in lambda handlers (#79)

* handle / in lambda handlers and replace them with .

* handle names with `/`

* try to fix lint?

* add more tests and move function to its own file

* fix lint

* format again

* format tests

Author: Czechh

datadog_lambda/handler.py

@@ -8,6 +8,7 @@
 
 import os
 from datadog_lambda.wrapper import datadog_lambda_wrapper
+from datadog_lambda.module_name import modify_module_name
 
 
 class HandlerError(Exception):
@@ -23,6 +24,8 @@ class HandlerError(Exception):
 if len(parts) != 2:
     raise HandlerError("Value %s for DD_LAMBDA_HANDLER has invalid format." % path)
 
+
 (mod_name, handler_name) = parts
-handler_module = import_module(mod_name)
+modified_mod_name = modify_module_name(mod_name)
+handler_module = import_module(modified_mod_name)
 handler = datadog_lambda_wrapper(getattr(handler_module, handler_name))

datadog_lambda/module_name.py

@@ -0,0 +1,4 @@
+def modify_module_name(module_name):
+    """Returns a valid modified module to get imported
+    """
+    return ".".join(module_name.split("/"))

tests/test_module_name.py

@@ -0,0 +1,21 @@
+import sys
+import os
+import unittest
+
+try:
+    from unittest.mock import patch, call, MagicMock
+except ImportError:
+    from mock import patch, call, MagicMock
+
+from datadog_lambda.module_name import modify_module_name
+
+
+class TestModifyModuleName(unittest.TestCase):
+    def test_modify_module_name(self):
+        self.assertEqual(
+            modify_module_name("lambda/handler/name.bar"), "lambda.handler.name.bar"
+        )
+        self.assertEqual(
+            modify_module_name("lambda.handler/name.biz"), "lambda.handler.name.biz"
+        )
+        self.assertEqual(modify_module_name("foo.handler"), "foo.handler")