File: //usr/lib/python3/dist-packages/twisted/spread/__pycache__/jelly.cpython-310.pyc
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S-expression-based persistence of python objects.
It does something very much like L{Pickle<pickle>}; however, pickle's main goal
seems to be efficiency (both in space and time); jelly's main goals are
security, human readability, and portability to other environments.
This is how Jelly converts various objects to s-expressions.
Boolean::
True --> ['boolean', 'true']
Integer::
1 --> 1
List::
[1, 2] --> ['list', 1, 2]
String::
"hello" --> "hello"
Float::
2.3 --> 2.3
Dictionary::
{'a': 1, 'b': 'c'} --> ['dictionary', ['b', 'c'], ['a', 1]]
Module::
UserString --> ['module', 'UserString']
Class::
UserString.UserString --> ['class', ['module', 'UserString'], 'UserString']
Function::
string.join --> ['function', 'join', ['module', 'string']]
Instance: s is an instance of UserString.UserString, with a __dict__
{'data': 'hello'}::
["UserString.UserString", ['dictionary', ['data', 'hello']]]
Class Method: UserString.UserString.center::
['method', 'center', ['None'], ['class', ['module', 'UserString'],
'UserString']]
Instance Method: s.center, where s is an instance of UserString.UserString::
['method', 'center', ['instance', ['reference', 1, ['class',
['module', 'UserString'], 'UserString']], ['dictionary', ['data', 'd']]],
['dereference', 1]]
The Python 2.x C{sets.Set} and C{sets.ImmutableSet} classes are
serialized to the same thing as the builtin C{set} and C{frozenset}
classes. (This is only relevant if you are communicating with a
version of jelly running on an older version of Python.)
@author: Glyph Lefkowitz
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Given an object, if that object is a type, return a new, blank instance
of that type which has not had C{__init__} called on it. If the object
is not a type, return L{None}.
@param cls: The type (or class) to create an instance of.
@type cls: L{type} or something else that cannot be
instantiated.
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isinstance�type�__new__)�cls� r �6/usr/lib/python3/dist-packages/twisted/spread/jelly.py� _createBlank� s
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via C{__setstate__}, if available.
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Set which local class will represent a remote type.
If you have written a Copyable class that you expect your client to be
receiving, write a local "copy" class to represent it, then call::
jellier.setUnjellyableForClass('module.package.Class', MyCopier).
Call this at the module level immediately after its class
definition. MyCopier should be a subclass of RemoteCopy.
The classname may be a special tag returned by
'Copyable.getTypeToCopyFor' rather than an actual classname.
This call is also for cached classes, since there will be no
overlap. The rules are the same.
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allowTypes)� classname� unjellyabler r r �setUnjellyableForClass� s r: c C r4 )a�
Set the factory to construct a remote instance of a type::
jellier.setUnjellyableFactoryForClass('module.package.Class', MyFactory)
Call this at the module level immediately after its class definition.
C{copyFactory} should return an instance or subclass of
L{RemoteCopy<pb.RemoteCopy>}.
Similar to L{setUnjellyableForClass} except it uses a factory instead
of creating an instance.
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Set all classes in a module derived from C{baseClass} as copiers for
a corresponding remote class.
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side, and a mirror structure of Copied (or RemoteCache) classes on the
other, use this to setUnjellyableForClass all your Copieds for the
Copyables.
Each copyTag (the "classname" argument to getTypeToCopyFor, and
what the Copyable's getTypeToCopyFor returns) is formed from
adding a prefix to the Copied's class name. The prefix defaults
to module.__name__. If you wish the copy tag to consist of solely
the classname, pass the empty string ''.
@param module: a module object from which to pull the Copied classes.
(passing sys.modules[__name__] might be useful)
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unjellyableRegistry.
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issubclass� TypeErrorr: )�module� baseClass�prefix�name�loaded�yesr r r �setUnjellyableForClassTree� s
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Utility method to default to 'normal' state rules in serialization.
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Utility method to default to 'normal' state rules in unserialization.
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convenience method.
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@see: L{twisted.spread.interfaces.IJellyable.jellyFor}
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@see: L{twisted.spread.interfaces.IUnjellyable.unjellyFor}
rT )rU rl )r[ rV rW r% r r r �
unjellyForQ s zUnjellyable.unjellyForN)r> rb rc rd rl rm r r r r rk G rj rk c @ sZ e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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(Internal) This class manages state for a call to jelly()
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(internal) Backreference an object.
Notes on this method for the hapless future maintainer: If I've already
gone through the prepare/preserve cycle on the specified object (it is
being referenced after the serializer is "done with" it, e.g. this
reference is NOT circular), the copy-in-place of aList is relevant,
since the list being modified is the actual, pre-existing jelly
expression that was returned for that object. If not, it's technically
superfluous, since the value in self.preserved didn't need to be set,
but the invariant that self.preserved[id(object)] is a list is
convenient because that means we don't have to test and create it or
not create it here, creating fewer code-paths. that's why
self.preserved is always set to a list.
Sorry that this code is so hard to follow, but Python objects are
tricky to persist correctly. -glyph
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z_Jellier._cookc C s g | j t|�< || jt|�< g S )a]
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backreferences to be made internal to the object. (circular
references).
The reason this needs to happen is that we don't generate an ID for
every object, so we won't necessarily know which ID the object will
have in the future. When it is 'cooked' ( see _cook ), it will be
assigned an ID, and the temporary placeholder list created here will be
modified in-place to create an expression that gives this object an ID:
[reference id# [object-jelly]].
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Jelly an iterable object.
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@param obj: any iterable object.
@type obj: C{iterable}
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@rtype: C{generator}
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�z_Jellier._jellyIterablec C s0 |� � \}}}tdd� |�}|r| }d||gS )z�
Jelly a decimal object.
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@type d: C{decimal.Decimal}
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@rtype: C{list}
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r )�left�rightr r r �<lambda>X s z(_Jellier.jelly_decimal.<locals>.<lambda>� decimal)�as_tupler )r[ �d�sign�guts�exponent�valuer r r r� M s
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(internal) Returns an sexp: (unpersistable "reason"). Utility method
for making note that a particular object could not be serialized.
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z_Jellier.unpersistabler" )
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references�
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z_Unjellier.__init__c C s | � |�}| jD ]}|� q|S r" )rU r� )r[ r� �o�mr r r � unjellyFulls s
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If the given object has support for the C{postUnjelly} hook, set it up
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� postUnjelly)rJ r� r� r� )r[ � unjelliedr r r �_maybePostUnjellyy s
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C{__dict__} unless it has a C{__setstate__} that takes something
else.
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)r� r- rU )r[ r r% r r r r� � s z_Unjellier._genericUnjellyc C s d S r" r �r[ �expr r r �
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Unjelly decimal objects.
r rT )r� r� r� )r[ r� r� r� r� r� r r r �_unjelly_decimal� s z_Unjellier._unjelly_decimalc C s |d dv sJ �|d dkS )Nr )r� r� r� r r� r r r �_unjelly_boolean� s z_Unjellier._unjelly_booleanc C s t j tt|d �� �� S �Nr )r� �mapr� r� r� r r r �_unjelly_datetime� � z _Unjellier._unjelly_datetimec C � t jtt|d �� �� S r� )r� r� r� r� r� r� r r r �
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Helper method to unjelly set or frozenset.
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Unjelly frozenset using the C{frozenset} builtin.
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moduleName�modr r r �_unjelly_module0 s z_Unjellier._unjelly_modulec C s� t |d �}|�t d��}t d��|d d� �}| j�|�s$td| ��t|�}t|�}|tur8td||f ��| j�|�sFtdt |� ��|S )Nr r� r� zmodule %s not allowedz6class %r unjellied to something that isn't a class: %rzclass not allowed: %s)
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)r[ r! �fname�modSplitr� �functionr r r �_unjelly_functionJ s z _Unjellier._unjelly_functionc C s" | j r
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(internal) Unjelly an instance.
Called to handle the deprecated I{instance} token.
@param rest: The s-expression representing the instance.
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Serialize to s-expression.
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Unserialize from s-expression.
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disallowed type, module, or class attempted to unserialize.
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