Sanic multi-application server (#2347)

sanic/touchup/schemes/ode.py

@@ -10,12 +10,14 @@ from .base import BaseScheme
 
 class OptionalDispatchEvent(BaseScheme):
     ident = "ODE"
+    SYNC_SIGNAL_NAMESPACES = "http."
 
     def __init__(self, app) -> None:
         super().__init__(app)
 
+        self._sync_events()
         self._registered_events = [
-            signal.path for signal in app.signal_router.routes
+            signal.name for signal in app.signal_router.routes
         ]
 
     def run(self, method, module_globals):
@@ -31,6 +33,35 @@ class OptionalDispatchEvent(BaseScheme):
 
         return exec_locals[method.__name__]
 
+    def _sync_events(self):
+        all_events = set()
+        app_events = {}
+        for app in self.app.__class__._app_registry.values():
+            if app.state.server_info:
+                app_events[app] = {
+                    signal.name for signal in app.signal_router.routes
+                }
+                all_events.update(app_events[app])
+
+        for app, events in app_events.items():
+            missing = {
+                x
+                for x in all_events.difference(events)
+                if any(x.startswith(y) for y in self.SYNC_SIGNAL_NAMESPACES)
+            }
+            if missing:
+                was_finalized = app.signal_router.finalized
+                if was_finalized:  # no cov
+                    app.signal_router.reset()
+                for event in missing:
+                    app.signal(event)(self.noop)
+                if was_finalized:  # no cov
+                    app.signal_router.finalize()
+
+    @staticmethod
+    async def noop(**_):  # no cov
+        ...
+
 
 class RemoveDispatch(NodeTransformer):
     def __init__(self, registered_events, verbosity: int = 0) -> None: