diff --git a/synapse/util/logcontext.py b/synapse/util/logcontext.py
index 9683cc7265..48c9f6802d 100644
--- a/synapse/util/logcontext.py
+++ b/synapse/util/logcontext.py
@@ -261,67 +261,6 @@ class PreserveLoggingContext(object):
)
-class _PreservingContextDeferred(defer.Deferred):
- """A deferred that ensures that all callbacks and errbacks are called with
- the given logging context.
- """
- def __init__(self, context):
- self._log_context = context
- defer.Deferred.__init__(self)
-
- def addCallbacks(self, callback, errback=None,
- callbackArgs=None, callbackKeywords=None,
- errbackArgs=None, errbackKeywords=None):
- callback = self._wrap_callback(callback)
- errback = self._wrap_callback(errback)
- return defer.Deferred.addCallbacks(
- self, callback,
- errback=errback,
- callbackArgs=callbackArgs,
- callbackKeywords=callbackKeywords,
- errbackArgs=errbackArgs,
- errbackKeywords=errbackKeywords,
- )
-
- def _wrap_callback(self, f):
- def g(res, *args, **kwargs):
- with PreserveLoggingContext(self._log_context):
- res = f(res, *args, **kwargs)
- return res
- return g
-
-
-def preserve_context_over_fn(fn, *args, **kwargs):
- """Takes a function and invokes it with the given arguments, but removes
- and restores the current logging context while doing so.
-
- If the result is a deferred, call preserve_context_over_deferred before
- returning it.
- """
- with PreserveLoggingContext():
- res = fn(*args, **kwargs)
-
- if isinstance(res, defer.Deferred):
- return preserve_context_over_deferred(res)
- else:
- return res
-
-
-def preserve_context_over_deferred(deferred, context=None):
- """Given a deferred wrap it such that any callbacks added later to it will
- be invoked with the current context.
-
- Deprecated: this almost certainly doesn't do want you want, ie make
- the deferred follow the synapse logcontext rules: try
- ``make_deferred_yieldable`` instead.
- """
- if context is None:
- context = LoggingContext.current_context()
- d = _PreservingContextDeferred(context)
- deferred.chainDeferred(d)
- return d
-
-
def preserve_fn(f):
"""Wraps a function, to ensure that the current context is restored after
return from the function, and that the sentinel context is set once the
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