Revert FileNotFound error

Author: gavin-aguiar

azure_functions_worker/dispatcher.py

@@ -383,12 +383,11 @@ def load_function_metadata(self, function_app_directory, caller_info):
         function_path = os.path.join(function_app_directory,
                                      script_file_name)
 
-        if not os.path.exists(function_path):
-            raise FileNotFoundError("function_app.py not "
-                                    f"found in {function_path}")
-
-        self._function_metadata_result = self.index_functions(
-            function_path, function_app_directory)
+        # For V1, the function path will not exist and
+        # return None.
+        self._function_metadata_result = (
+            self.index_functions(function_path)) \
+            if os.path.exists(function_path) else None
 
     async def _handle__functions_metadata_request(self, request):
         metadata_request = request.functions_metadata_request

tests/unittests/test_dispatcher.py

@@ -21,7 +21,6 @@
 from tests.utils import testutils
 from tests.utils.testutils import UNIT_TESTS_ROOT
 
-
 SysVersionInfo = col.namedtuple("VersionInfo", ["major", "minor", "micro",
                                                 "releaselevel", "serial"])
 DISPATCHER_FUNCTIONS_DIR = testutils.UNIT_TESTS_FOLDER / 'dispatcher_functions'
@@ -915,34 +914,6 @@ def test_functions_metadata_request_with_indexing_exception(
             metadata_response.function_metadata_response.result.status,
             protos.StatusResult.Failure)
 
-    @patch.dict(os.environ, {PYTHON_ENABLE_INIT_INDEXING: 'false'})
-    def test_functions_metadata_request_with_filenotfound_exception(self):
-
-        request = protos.StreamingMessage(
-            worker_init_request=protos.WorkerInitRequest(
-                host_version="2.3.4",
-                function_app_directory=str(FUNCTION_APP_DIRECTORY)
-            )
-        )
-
-        metadata_request = protos.StreamingMessage(
-            functions_metadata_request=protos.FunctionsMetadataRequest(
-                function_app_directory="NonExistentDirectory"
-            )
-        )
-
-        self.loop.run_until_complete(
-            self.dispatcher._handle__worker_init_request(request))
-
-        metadata_response = self.loop.run_until_complete(
-            self.dispatcher._handle__functions_metadata_request(
-                metadata_request))
-
-        self.assertEqual(
-            metadata_response.function_metadata_response.result.exception.message,
-            "FileNotFoundError: function_app.py not "
-            "found in NonExistentDirectory\\function_app.py")
-
     @patch.dict(os.environ, {PYTHON_ENABLE_INIT_INDEXING: 'false'})
     def test_dispatcher_indexing_in_load_request(self):
         init_request = protos.StreamingMessage(