Improve the backwards compatibility re-exports of synapse.logging.context (#5617)

* Improve the backwards compatibility re-exports of synapse.logging.context.

* reexport logformatter too

changelog.d/5617.misc

@@ -0,0 +1 @@
+Move logging code out of `synapse.util` and into `synapse.logging`.

synapse/util/__init__.py

@@ -21,14 +21,10 @@ import attr
 
 from twisted.internet import defer, task
 
-from synapse.logging import context, formatter
+from synapse.logging import context
 
 logger = logging.getLogger(__name__)
 
-# Compatibility alias, for existing logconfigs.
-logcontext = context
-logformatter = formatter
-
 
 def unwrapFirstError(failure):
     # defer.gatherResults and DeferredLists wrap failures.

synapse/util/logcontext.py

@@ -0,0 +1,39 @@
+# Copyright 2019 The Matrix.org Foundation C.I.C.
+#
+# 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.
+
+"""
+Backwards compatibility re-exports of ``synapse.logging.context`` functionality.
+"""
+
+from synapse.logging.context import (
+    LoggingContext,
+    LoggingContextFilter,
+    PreserveLoggingContext,
+    defer_to_thread,
+    make_deferred_yieldable,
+    nested_logging_context,
+    preserve_fn,
+    run_in_background,
+)
+
+__all__ = [
+    "defer_to_thread",
+    "LoggingContext",
+    "LoggingContextFilter",
+    "make_deferred_yieldable",
+    "nested_logging_context",
+    "preserve_fn",
+    "PreserveLoggingContext",
+    "run_in_background",
+]

synapse/util/logformatter.py

@@ -0,0 +1,21 @@
+# Copyright 2019 The Matrix.org Foundation C.I.C.
+#
+# 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.
+
+"""
+Backwards compatibility re-exports of ``synapse.logging.formatter`` functionality.
+"""
+
+from synapse.logging.formatter import LogFormatter
+
+__all__ = ["LogFormatter"]