Add config option to skip Touchup step, for debugging purposes (#2361)

Co-authored-by: Adam Hopkins <adam@amhopkins.com>

sanic/app.py

@@ -1511,7 +1511,8 @@ class Sanic(BaseSanic, RunnerMixin, metaclass=TouchUpMeta):
             if not Sanic.test_mode:
                 raise e
 
-    def signalize(self):
+    def signalize(self, allow_fail_builtin=True):
+        self.signal_router.allow_fail_builtin = allow_fail_builtin
         try:
             self.signal_router.finalize()
         except FinalizationError as e:
@@ -1526,8 +1527,11 @@ class Sanic(BaseSanic, RunnerMixin, metaclass=TouchUpMeta):
         if hasattr(self, "_ext"):
             self.ext._display()
 
+        if self.state.is_debug:
+            self.config.TOUCHUP = False
+
         # Setup routers
-        self.signalize()
+        self.signalize(self.config.TOUCHUP)
         self.finalize()
 
         # TODO: Replace in v22.6 to check against apps in app registry
@@ -1547,7 +1551,8 @@ class Sanic(BaseSanic, RunnerMixin, metaclass=TouchUpMeta):
             # TODO:
             # - Raise warning if secondary apps have error handler config
             ErrorHandler.finalize(self.error_handler, config=self.config)
-            TouchUp.run(self)
+            if self.config.TOUCHUP:
+                TouchUp.run(self)
 
         self.state.is_started = True
 

sanic/config.py

@@ -38,6 +38,7 @@ DEFAULT_CONFIG = {
     "REQUEST_MAX_SIZE": 100000000,  # 100 megabytes
     "REQUEST_TIMEOUT": 60,  # 60 seconds
     "RESPONSE_TIMEOUT": 60,  # 60 seconds
+    "TOUCHUP": True,
     "USE_UVLOOP": _default,
     "WEBSOCKET_MAX_SIZE": 2**20,  # 1 megabyte
     "WEBSOCKET_PING_INTERVAL": 20,
@@ -81,6 +82,7 @@ class Config(dict, metaclass=DescriptorMeta):
     REQUEST_TIMEOUT: int
     RESPONSE_TIMEOUT: int
     SERVER_NAME: str
+    TOUCHUP: bool
     USE_UVLOOP: Union[Default, bool]
     WEBSOCKET_MAX_SIZE: int
     WEBSOCKET_PING_INTERVAL: int

sanic/signals.py

@@ -80,6 +80,7 @@ class SignalRouter(BaseRouter):
             group_class=SignalGroup,
             stacking=True,
         )
+        self.allow_fail_builtin = True
         self.ctx.loop = None
 
     def get(  # type: ignore
@@ -129,7 +130,8 @@ class SignalRouter(BaseRouter):
         try:
             group, handlers, params = self.get(event, condition=condition)
         except NotFound as e:
-            if fail_not_found:
+            is_reserved = event.split(".", 1)[0] in RESERVED_NAMESPACES
+            if fail_not_found and (not is_reserved or self.allow_fail_builtin):
                 raise e
             else:
                 if self.ctx.app.debug and self.ctx.app.state.verbosity >= 1: