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authorErik Johnston <erik@matrix.org>2019-07-15 14:13:22 +0100
committerErik Johnston <erik@matrix.org>2019-07-15 14:13:22 +0100
commite8c53b07f2fa5cdd671841cb6feed0f6b3f8d073 (patch)
treea8105b0f3a9efd467f10500e933125bf203ab42e /synapse/logging/formatter.py
parentUse set_defaults(func=) style (diff)
parentReturn a different error from Invalid Password when a user is deactivated (#5... (diff)
downloadsynapse-e8c53b07f2fa5cdd671841cb6feed0f6b3f8d073.tar.xz
Merge branch 'develop' of github.com:matrix-org/synapse into erikj/admin_api_cmd
Diffstat (limited to 'synapse/logging/formatter.py')
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diff --git a/synapse/logging/formatter.py b/synapse/logging/formatter.py
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+# -*- 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