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-rw-r--r--synapse/federation/transport/server/_base.py13
1 files changed, 12 insertions, 1 deletions
diff --git a/synapse/federation/transport/server/_base.py b/synapse/federation/transport/server/_base.py
index d629a3ecb5..103861644a 100644
--- a/synapse/federation/transport/server/_base.py
+++ b/synapse/federation/transport/server/_base.py
@@ -21,7 +21,7 @@ from typing import TYPE_CHECKING, Any, Awaitable, Callable, Dict, Optional, Tupl
 
 from synapse.api.errors import Codes, FederationDeniedError, SynapseError
 from synapse.api.urls import FEDERATION_V1_PREFIX
-from synapse.http.server import HttpServer, ServletCallback
+from synapse.http.server import HttpServer, ServletCallback, is_method_cancellable
 from synapse.http.servlet import parse_json_object_from_request
 from synapse.http.site import SynapseRequest
 from synapse.logging.context import run_in_background
@@ -373,6 +373,17 @@ class BaseFederationServlet:
             if code is None:
                 continue
 
+            if is_method_cancellable(code):
+                # The wrapper added by `self._wrap` will inherit the cancellable flag,
+                # but the wrapper itself does not support cancellation yet.
+                # Once resolved, the cancellation tests in
+                # `tests/federation/transport/server/test__base.py` can be re-enabled.
+                raise Exception(
+                    f"{self.__class__.__name__}.on_{method} has been marked as "
+                    "cancellable, but federation servlets do not support cancellation "
+                    "yet."
+                )
+
             server.register_paths(
                 method,
                 (pattern,),