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o �b1 � @ sP U d Z ddlZddlZddlZddlZddlZddlmZ ddl m Z ddl m Z mZ ddlmZ i Ze eejf ed< ejZdd � Zd d � Zd d � Ze�eje� dd� Zdd� Z e�ej e� dd� Z dd� Z e�eje � dd� Z dd� Z!dd� Z"d d � Z#G d d � d �Z$i a%e e&d f ed!< i a'd"d#� Z(d$d%� Z)d&d'� Z*G d(d � d �Z+dS ))z( Different styles of persisted objects. � N)�StringIO)�Dict)�log�reflect)�_PYPY� oldModulesc C s t | j| j| jjffS )z3support function for copy_reg to pickle method refs)�unpickleMethod�__name__�__self__� __class__)�method� r �:/usr/lib/python3/dist-packages/twisted/persisted/styles.py� pickleMethod s �r c C s t | |�}|S )a� Retrieve the function object implementing a method name given the class it's on and a method name. @param classObject: A class to retrieve the method's function from. @type classObject: L{type} @param methodName: The name of the method whose function to retrieve. @type methodName: native L{str} @return: the function object corresponding to the given method name. @rtype: L{types.FunctionType} )�getattr)� classObject� methodName� methodObjectr r r �_methodFunction" s r c C s� |du r t || �S zt|| �}W n& ty6 t�d| d|� |dus'J d��|j|u r-� t| ||j� Y S w d}tj||g|�R � }|S )aS Support function for copy_reg to unpickle method refs. @param im_name: The name of the method. @type im_name: native L{str} @param im_self: The instance that the method was present on. @type im_self: L{object} @param im_class: The class where the method was declared. @type im_class: L{type} or L{None} N�Methodz not on classz'No recourse: no instance to guess from.r ) r r �AttributeErrorr �msgr r �types� MethodType)�im_name�im_self�im_class�methodFunction� maybeClass�boundr r r r 4 s � r c C s4 | j dkr td| � ���ttd�| j| jg�g�fS )a� Reduce, in the sense of L{pickle}'s C{object.__reduce__} special method, a function object into its constituent parts. @param f: The function to reduce. @type f: L{types.FunctionType} @return: a 2-tuple of a reference to L{_unpickleFunction} and a tuple of its arguments, a 1-tuple of the function's fully qualified name. @rtype: 2-tuple of C{callable, native string} z<lambda>z Cannot pickle lambda function: �.)r �_UniversalPicklingError�_unpickleFunction�tuple�join� __module__� __qualname__)�fr r r �_pickleFunctionW s r( c C s ddl m} || �S )a� Convert a function name into a function by importing it. This is a synonym for L{twisted.python.reflect.namedAny}, but imported locally to avoid circular imports, and also to provide a persistent name that can be stored (and deprecated) independently of C{namedAny}. @param fullyQualifiedName: The fully qualified name of a function. @type fullyQualifiedName: native C{str} @return: A function object imported from the given location. @rtype: L{types.FunctionType} r )�namedAny)�twisted.python.reflectr) )�fullyQualifiedNamer) r r r r" h s r" c C s t | jffS )z3support function for copy_reg to pickle module refs)�unpickleModuler )�moduler r r � pickleModule~ s r. c C s6 | t v rt�d| � t | } t�| � t| i i d�S )z5support function for copy_reg to unpickle module refszModule has moved: %s�x)r r r � __import__)�namer r r r, � s r, c C s t | �� | �� ffS )z� Reduce the given cStringO. This is only called on Python 2, because the cStringIO module only exists on Python 2. @param stringo: The string output to pickle. @type stringo: C{cStringIO.OutputType} )�unpickleStringO�getvalue�tell)�stringor r r � pickleStringO� s r6 c C s t � }|�| � |�|� |S )a� Convert the output of L{pickleStringO} into an appropriate type for the current python version. This may be called on Python 3 and will convert a cStringIO into an L{io.StringIO}. @param val: The content of the file. @type val: L{bytes} @param sek: The seek position of the file. @type sek: L{int} @return: a file-like object which you can write bytes to. @rtype: C{cStringIO.OutputType} on Python 2, L{io.StringIO} on Python 3. )� _cStringIO�write�seek��val�sekr/ r r r r2 � s r2 c C s t | �� | �� ffS )aQ Reduce the given cStringI. This is only called on Python 2, because the cStringIO module only exists on Python 2. @param stringi: The string input to pickle. @type stringi: C{cStringIO.InputType} @return: a 2-tuple of (C{unpickleStringI}, (bytes, pointer)) @rtype: 2-tuple of (function, (bytes, int)) )�unpickleStringIr3 r4 )�stringir r r � pickleStringI� s r? c C s t | �}|�|� |S )a� Convert the output of L{pickleStringI} into an appropriate type for the current Python version. This may be called on Python 3 and will convert a cStringIO into an L{io.StringIO}. @param val: The content of the file. @type val: L{bytes} @param sek: The seek position of the file. @type sek: L{int} @return: a file-like object which you can read bytes from. @rtype: C{cStringIO.OutputType} on Python 2, L{io.StringIO} on Python 3. )r7 r9 r: r r r r= � s r= c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) � Ephemeralzh This type of object is never persisted; if possible, even references to it are eliminated. c C s t dfS )zu Serialize any subclass of L{Ephemeral} in a way which replaces it with L{Ephemeral} itself. r )r@ )�selfr r r � __reduce__� s zEphemeral.__reduce__c C sJ t �d| � ts#dd l}t|dd �r#|�| �D ] }t �d|� �� qd S )Nz!WARNING: serializing ephemeral %sr � get_referrersz referred to by )r r r �gcr rC )rA rD �rr r r � __getstate__� s zEphemeral.__getstate__c C s t �d| j � t| _d S )Nz#WARNING: unserializing ephemeral %s)r r r r@ �rA �stater r r � __setstate__� s zEphemeral.__setstate__N)r r% r& �__doc__rB rF rI r r r r r@ � s r@ � Versioned�versionedsToUpgradec C s& t t�� �D ]} t| � qi ai ad S �N)�listrL �values�requireUpgrade�upgraded)� versionedr r r � doUpgrade� s rS c C s4 t | �}|tv r|tvrdt|< | �� | S dS dS )z?Require that a Versioned instance be upgraded completely first.� N)�idrL rQ �versionUpgrade)�obj�objIDr r r rP s �rP c C s@ | t g}t�| �D ]}||vrt|t �r|�|� q |dd� S )z� Get all of the parent classes of C{c}, not including C{c} itself, which are strict subclasses of L{Versioned}. @param c: a class @returns: list of classes � N)rK �inspect�getmro� issubclass�append)�c�l�br r r �_aybabtu s � ra c @ s2 e Zd ZdZdZdZdd� Zd dd�Zd d � ZdS ) rK a� This type of object is persisted with versioning information. I have a single class attribute, the int persistenceVersion. After I am unserialized (and styles.doUpgrade() is called), self.upgradeToVersionX() will be called for each version upgrade I must undergo. For example, if I serialize an instance of a Foo(Versioned) at version 4 and then unserialize it when the code is at version 9, the calls:: self.upgradeToVersion5() self.upgradeToVersion6() self.upgradeToVersion7() self.upgradeToVersion8() self.upgradeToVersion9() will be made. If any of these methods are undefined, a warning message will be printed. r r c C s | t t| �< || _d S rM )rL rU �__dict__rG r r r rI 3 s zVersioned.__setstate__Nc C s� t � |p| j�}t| j�}|�� |�| j� |D ]$}d|jv r-|jD ] }||v r,||= q#d|jv r=|j|t� |�� d�< q|S )z8Get state, adding a version number to it on its way out.�persistenceForgets�persistenceVersionz.persistenceVersion) �copyrb ra r �reverser] rc rd r �qual)rA �dict�dct�bases�base�slotr r r rF 7 s" � ���zVersioned.__getstate__c C sZ t | j�}|�� |�| j� d| jv rB| jd }| jd= d}d}|D ]}d|jvr+q#|j|kr5|}|j}q#|rB|| jdt�|� < |D ]f}t|j vrQd|jvrQqD|j}dt�|� }| j� |�pbd}|ri| j|= ||ksqJ d��||k r�|d }|j� d| d�} | r�t � dt�|�t�| j�t | �|f � | | � n t � d �||�� ||k suqDdS ) z (internal) Do a version upgrade.rd r Nz%s.persistenceVersionz"Sorry, can't go backwards in time.rT zupgradeToVersion%sz'Upgrading %s (of %s @ %s) to version %sz(Warning: cannot upgrade {} to version {})ra r rf r] rb rd r rg rK � __bases__�getr r rU �format) rA rj �pver�highestVersion� highestBaserk � currentVers�pverName� persistVersr r r r rV H sh �� � ��� �����zVersioned.versionUpgraderM ) r r% r& rJ rd rc rI rF rV r r r r rK s ),rJ re �copyreg�copy_regrZ �pickler �ior r7 �typingr �twisted.pythonr r �twisted.python.compatr r �str� ModuleType�__annotations__� PicklingErrorr! r r r r r( r" � FunctionTyper. r, r6 r2 r? r= r@ rL �intrQ rS rP ra rK r r r r �<module> sB
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