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# Copyright (C) 2015 Yahoo! Inc. All Rights Reserved.
#
# 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.
# Keys extracted from the message properties when formatting...
_MSG_PROPERTIES = tuple([
'correlation_id',
'delivery_info/routing_key',
'type',
])
class DelayedPretty:
"""Wraps a message and delays prettifying it until requested.
TODO(harlowja): remove this when https://github.com/celery/kombu/pull/454/
is merged and a release is made that contains it (since that pull
request is equivalent and/or better than this).
"""
def __init__(self, message):
self._message = message
self._message_pretty = None
def __str__(self):
if self._message_pretty is None:
self._message_pretty = _prettify_message(self._message)
return self._message_pretty
def _get_deep(properties, *keys):
"""Get a final key among a list of keys (each with its own sub-dict)."""
for key in keys:
properties = properties[key]
return properties
def _prettify_message(message):
"""Kombu doesn't currently have a useful ``__str__()`` or ``__repr__()``.
This provides something decent(ish) for debugging (or other purposes) so
that messages are more nice and understandable....
"""
if message.content_type is not None:
properties = {
'content_type': message.content_type,
}
else:
properties = {}
for name in _MSG_PROPERTIES:
segments = name.split("/")
try:
value = _get_deep(message.properties, *segments)
except (KeyError, ValueError, TypeError):
pass
else:
if value is not None:
properties[segments[-1]] = value
if message.body is not None:
properties['body_length'] = len(message.body)
return "{delivery_tag}: {properties}".format(
delivery_tag=message.delivery_tag,
properties=properties,
)
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