104 lines
3.2 KiB
Python
104 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014-2016 OpenMarket 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.
|
|
|
|
|
|
class JsonEncodedObject(object):
|
|
""" A common base class for defining protocol units that are represented
|
|
as JSON.
|
|
|
|
Attributes:
|
|
unrecognized_keys (dict): A dict containing all the key/value pairs we
|
|
don't recognize.
|
|
"""
|
|
|
|
valid_keys = [] # keys we will store
|
|
"""A list of strings that represent keys we know about
|
|
and can handle. If we have values for these keys they will be
|
|
included in the `dictionary` instance variable.
|
|
"""
|
|
|
|
internal_keys = [] # keys to ignore while building dict
|
|
"""A list of strings that should *not* be encoded into JSON.
|
|
"""
|
|
|
|
required_keys = []
|
|
"""A list of strings that we require to exist. If they are not given upon
|
|
construction it raises an exception.
|
|
"""
|
|
|
|
def __init__(self, **kwargs):
|
|
""" Takes the dict of `kwargs` and loads all keys that are *valid*
|
|
(i.e., are included in the `valid_keys` list) into the dictionary`
|
|
instance variable.
|
|
|
|
Any keys that aren't recognized are added to the `unrecognized_keys`
|
|
attribute.
|
|
|
|
Args:
|
|
**kwargs: Attributes associated with this protocol unit.
|
|
"""
|
|
for required_key in self.required_keys:
|
|
if required_key not in kwargs:
|
|
raise RuntimeError("Key %s is required" % required_key)
|
|
|
|
self.unrecognized_keys = {} # Keys we were given not listed as valid
|
|
for k, v in kwargs.items():
|
|
if k in self.valid_keys or k in self.internal_keys:
|
|
self.__dict__[k] = v
|
|
else:
|
|
self.unrecognized_keys[k] = v
|
|
|
|
def get_dict(self):
|
|
""" Converts this protocol unit into a :py:class:`dict`, ready to be
|
|
encoded as JSON.
|
|
|
|
The keys it encodes are: `valid_keys` - `internal_keys`
|
|
|
|
Returns
|
|
dict
|
|
"""
|
|
d = {
|
|
k: _encode(v)
|
|
for (k, v) in self.__dict__.items()
|
|
if k in self.valid_keys and k not in self.internal_keys
|
|
}
|
|
d.update(self.unrecognized_keys)
|
|
return d
|
|
|
|
def get_internal_dict(self):
|
|
d = {
|
|
k: _encode(v, internal=True)
|
|
for (k, v) in self.__dict__.items()
|
|
if k in self.valid_keys
|
|
}
|
|
d.update(self.unrecognized_keys)
|
|
return d
|
|
|
|
def __str__(self):
|
|
return "(%s, %s)" % (self.__class__.__name__, repr(self.__dict__))
|
|
|
|
|
|
def _encode(obj, internal=False):
|
|
if type(obj) is list:
|
|
return [_encode(o, internal=internal) for o in obj]
|
|
|
|
if isinstance(obj, JsonEncodedObject):
|
|
if internal:
|
|
return obj.get_internal_dict()
|
|
else:
|
|
return obj.get_dict()
|
|
|
|
return obj
|