Make warnings for DeprecationWarning consistent (#2332)

sanic/app.py

@@ -42,6 +42,7 @@ from typing import (
     Union,
 )
 from urllib.parse import urlencode, urlunparse
+from warnings import filterwarnings
 
 from sanic_routing.exceptions import (  # type: ignore
     FinalizationError,
@@ -95,6 +96,8 @@ from sanic.touchup import TouchUp, TouchUpMeta
 if OS_IS_WINDOWS:
     enable_windows_color_support()
 
+filterwarnings("once", category=DeprecationWarning)
+
 
 class Sanic(BaseSanic, metaclass=TouchUpMeta):
     """

sanic/handlers.py

@@ -1,5 +1,6 @@
 from inspect import signature
 from typing import Dict, List, Optional, Tuple, Type
+from warnings import warn
 
 from sanic.errorpages import BaseRenderer, HTMLRenderer, exception_response
 from sanic.exceptions import (
@@ -53,16 +54,15 @@ class ErrorHandler:
 
         sig = signature(error_handler.lookup)
         if len(sig.parameters) == 1:
-            error_logger.warning(
-                DeprecationWarning(
-                    "You are using a deprecated error handler. The lookup "
-                    "method should accept two positional parameters: "
-                    "(exception, route_name: Optional[str]). "
-                    "Until you upgrade your ErrorHandler.lookup, Blueprint "
-                    "specific exceptions will not work properly. Beginning "
-                    "in v22.3, the legacy style lookup method will not "
-                    "work at all."
-                ),
+            warn(
+                "You are using a deprecated error handler. The lookup "
+                "method should accept two positional parameters: "
+                "(exception, route_name: Optional[str]). "
+                "Until you upgrade your ErrorHandler.lookup, Blueprint "
+                "specific exceptions will not work properly. Beginning "
+                "in v22.3, the legacy style lookup method will not "
+                "work at all.",
+                DeprecationWarning,
             )
             error_handler._lookup = error_handler._legacy_lookup
 

sanic/server/protocols/websocket_protocol.py

@@ -1,4 +1,5 @@
 from typing import TYPE_CHECKING, Optional, Sequence, cast
+from warnings import warn
 
 from websockets.connection import CLOSED, CLOSING, OPEN
 from websockets.server import ServerConnection
@@ -34,27 +35,24 @@ class WebSocketProtocol(HttpProtocol):
         self.websocket_max_size = websocket_max_size
         if websocket_max_queue is not None and websocket_max_queue > 0:
             # TODO: Reminder remove this warning in v22.3
-            error_logger.warning(
-                DeprecationWarning(
-                    "Websocket no longer uses queueing, so websocket_max_queue"
-                    " is no longer required."
-                )
+            warn(
+                "Websocket no longer uses queueing, so websocket_max_queue"
+                " is no longer required.",
+                DeprecationWarning,
             )
         if websocket_read_limit is not None and websocket_read_limit > 0:
             # TODO: Reminder remove this warning in v22.3
-            error_logger.warning(
-                DeprecationWarning(
-                    "Websocket no longer uses read buffers, so "
-                    "websocket_read_limit is not required."
-                )
+            warn(
+                "Websocket no longer uses read buffers, so "
+                "websocket_read_limit is not required.",
+                DeprecationWarning,
             )
         if websocket_write_limit is not None and websocket_write_limit > 0:
             # TODO: Reminder remove this warning in v22.3
-            error_logger.warning(
-                DeprecationWarning(
-                    "Websocket no longer uses write buffers, so "
-                    "websocket_write_limit is not required."
-                )
+            warn(
+                "Websocket no longer uses write buffers, so "
+                "websocket_write_limit is not required.",
+                DeprecationWarning,
             )
         self.websocket_ping_interval = websocket_ping_interval
         self.websocket_ping_timeout = websocket_ping_timeout

tests/test_exceptions_handler.py

@@ -218,20 +218,18 @@ def test_single_arg_exception_handler_notice(exception_handler_app, caplog):
 
     exception_handler_app.error_handler = CustomErrorHandler()
 
-    with caplog.at_level(logging.WARNING):
-        _, response = exception_handler_app.test_client.get("/1")
-
-    for record in caplog.records:
-        if record.message.startswith("You are"):
-            break
-
-    assert record.message == (
+    message = (
         "You are using a deprecated error handler. The lookup method should "
         "accept two positional parameters: (exception, route_name: "
         "Optional[str]). Until you upgrade your ErrorHandler.lookup, "
         "Blueprint specific exceptions will not work properly. Beginning in "
         "v22.3, the legacy style lookup method will not work at all."
     )
+    with pytest.warns(DeprecationWarning) as record:
+        _, response = exception_handler_app.test_client.get("/1")
+
+    assert len(record) == 1
+    assert record[0].message.args[0] == message
     assert response.status == 400