diff --git a/synapse/logging/formatter.py b/synapse/logging/formatter.py
new file mode 100644
index 0000000000..fbf570c756
--- /dev/null
+++ b/synapse/logging/formatter.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import logging
+import traceback
+
+from six import StringIO
+
+
+class LogFormatter(logging.Formatter):
+ """Log formatter which gives more detail for exceptions
+
+ This is the same as the standard log formatter, except that when logging
+ exceptions [typically via log.foo("msg", exc_info=1)], it prints the
+ sequence that led up to the point at which the exception was caught.
+ (Normally only stack frames between the point the exception was raised and
+ where it was caught are logged).
+ """
+
+ def __init__(self, *args, **kwargs):
+ super(LogFormatter, self).__init__(*args, **kwargs)
+
+ def formatException(self, ei):
+ sio = StringIO()
+ (typ, val, tb) = ei
+
+ # log the stack above the exception capture point if possible, but
+ # check that we actually have an f_back attribute to work around
+ # https://twistedmatrix.com/trac/ticket/9305
+
+ if tb and hasattr(tb.tb_frame, "f_back"):
+ sio.write("Capture point (most recent call last):\n")
+ traceback.print_stack(tb.tb_frame.f_back, None, sio)
+
+ traceback.print_exception(typ, val, tb, None, sio)
+ s = sio.getvalue()
+ sio.close()
+ if s[-1:] == "\n":
+ s = s[:-1]
+ return s
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