fix: Move backwards-compatible logic before function source load (GoogleCloudPlatform#152)

* Move backwards-compatible logic before function source load

* Fix formatting

Co-authored-by: Dustin Ingram <di@users.noreply.github.com>

Author: asriniva

src/functions_framework/__init__.py

@@ -232,11 +232,7 @@ def create_app(target=None, source=None, signature_type=None):
     global errorhandler
     errorhandler = app.errorhandler
 
-    # 6. Execute the module, within the application context
-    with app.app_context():
-        spec.loader.exec_module(source_module)
-
-    # Handle legacy GCF Python 3.7 behavior
+    # 6. Handle legacy GCF Python 3.7 behavior
     if os.environ.get("ENTRY_POINT"):
         os.environ["FUNCTION_TRIGGER_TYPE"] = signature_type
         os.environ["FUNCTION_NAME"] = os.environ.get("K_SERVICE", target)
@@ -254,6 +250,10 @@ def handle_none(rv):
         sys.stderr = _LoggingHandler("ERROR", sys.stderr)
         setup_logging()
 
+    # 7. Execute the module, within the application context
+    with app.app_context():
+        spec.loader.exec_module(source_module)
+
     # Extract the target function from the source file
     if not hasattr(source_module, target):
         raise MissingTargetException(