fix(apigateway): remove indentation in debug_mode (#987)

Author: heitorlessa

Diff for: aws_lambda_powertools/event_handler/api_gateway.py

@@ -446,10 +446,6 @@ def __init__(
         # Allow for a custom serializer or a concise json serialization
         self._serializer = serializer or partial(json.dumps, separators=(",", ":"), cls=Encoder)
 
-        if self._debug:
-            # Always does a pretty print when in debug mode
-            self._serializer = partial(json.dumps, indent=4, cls=Encoder)
-
     def route(
         self,
         rule: str,
@@ -496,7 +492,7 @@ def resolve(self, event, context) -> Dict[str, Any]:
             Returns the dict response
         """
         if self._debug:
-            print(self._json_dump(event))
+            print(self._json_dump(event), end="")
         BaseRouter.current_event = self._to_proxy_event(event)
         BaseRouter.lambda_context = context
         return self._resolve().build(self.current_event, self._cors)

Diff for: docs/core/event_handler/api_gateway.md

@@ -940,6 +940,8 @@ This will enable full tracebacks errors in the response, print request and respo
 ???+ danger
     This might reveal sensitive information in your logs and relax CORS restrictions, use it sparingly.
 
+    It's best to use for local development only!
+
 ```python hl_lines="3" title="Enabling debug mode"
 from aws_lambda_powertools.event_handler.api_gateway import ApiGatewayResolver
 

Diff for: tests/functional/event_handler/test_api_gateway.py

@@ -32,6 +32,12 @@
 from tests.functional.utils import load_event
 
 
+@pytest.fixture
+def json_dump():
+    # our serializers reduce length to save on costs; fixture to replicate separators
+    return lambda obj: json.dumps(obj, separators=(",", ":"))
+
+
 def read_media(file_name: str) -> bytes:
     path = Path(str(Path(__file__).parent.parent.parent.parent) + "/docs/media/" + file_name)
     return path.read_bytes()
@@ -506,13 +512,10 @@ def custom_method():
     assert headers["Access-Control-Allow-Methods"] == "CUSTOM"
 
 
-def test_service_error_responses():
+def test_service_error_responses(json_dump):
     # SCENARIO handling different kind of service errors being raised
     app = ApiGatewayResolver(cors=CORSConfig())
 
-    def json_dump(obj):
-        return json.dumps(obj, separators=(",", ":"))
-
     # GIVEN an BadRequestError
     @app.get(rule="/bad-request-error", cors=False)
     def bad_request_error():
@@ -641,7 +644,7 @@ def test_debug_mode_environment_variable(monkeypatch):
     assert app._debug
 
 
-def test_debug_json_formatting():
+def test_debug_json_formatting(json_dump):
     # GIVEN debug is True
     app = ApiGatewayResolver(debug=True)
     response = {"message": "Foo"}
@@ -654,7 +657,7 @@ def foo():
     result = app({"path": "/foo", "httpMethod": "GET"}, None)
 
     # THEN return a pretty print json in the body
-    assert result["body"] == json.dumps(response, indent=4)
+    assert result["body"] == json_dump(response)
 
 
 def test_debug_print_event(capsys):