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a s�h�8 � @ s� d Z ddlZddlZddlZddlZddlZddlZddlZddlm Z ddlm Z ddlm Z G dd� de �Z dd � ZG d d � d e�Zd d � ZG dd� de�ZdS )z Exception related utilities. � N)� encodeutils)� reflection)� timeutilsc sD e Zd ZdZd� fdd� Zdd� Zdd� Zd d � Zddd�Z� Z S )�CausedByExceptiona Base class for exceptions which have associated causes. NOTE(harlowja): in later versions of python we can likely remove the need to have a ``cause`` here as PY3+ have implemented :pep:`3134` which handles chaining in a much more elegant manner. :param message: the exception message, typically some string that is useful for consumers to view when debugging or analyzing failures. :param cause: the cause of the exception being raised, when provided this should itself be an exception instance, this is useful for creating a chain of exceptions for versions of python where this is not yet implemented/supported natively. .. versionadded:: 2.4 Nc s t t| ��|� || _d S �N)�superr �__init__�cause)�self�messager �� __class__� ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/oslo_utils/excutils.pyr 3 s zCausedByException.__init__c C s | � � �d�S )N�utf8)�pformat�encode�r r r r � __bytes__7 s zCausedByException.__bytes__c C s | � � S r )r r r r r �__str__: s zCausedByException.__str__c C s | j d S )Nr )�argsr r r r � _get_message= s z CausedByException._get_message� � Fc C sZ |dk rt d| ��t�� }|r>|�tj| dd�� |�d� |�| �� � |}| j}g }|du�rR||v�rR|�|� |�t j � t |t �r�|�|| � |�tj|dd�� |�d� |�|�� � nrt �t|�|�}t|�D ]T\} } |�|| � | �d��r| dd� } |�| � | d t|�kr�|�t j � q�qR||7 }t|d d�}qZ|�� S ) z9Pretty formats a caused exception + any connected causes.r zEProvided 'indent' must be greater than or equal to zero instead of %sF)Zfully_qualifiedz: N� ���� r )� ValueError�io�StringIO�writer Zget_class_namer r �append�os�linesep� isinstancer � traceback�format_exception_only�type� enumerate�endswith�len�getattr�getvalue) r �indentZ indent_textZshow_root_class�bufZ active_indentZnext_up�seen�lines�i�liner r r r C sD � � zCausedByException.pformat)N)r r F) �__name__� __module__� __qualname__�__doc__r r r r r � __classcell__r r r r r " s r c O s\ d|vr:t �� \}}}z|dur(||d< W ~~~n~~~0 | |g|�R i |��|�d��dS )a� Helper to raise + chain exceptions (when able) and associate a *cause*. NOTE(harlowja): Since in py3.x exceptions can be chained (due to :pep:`3134`) we should try to raise the desired exception with the given *cause* (or extract a *cause* from the current stack if able) so that the exception formats nicely in old and new versions of python. Since py2.x does **not** support exception chaining (or formatting) the exception class provided should take a ``cause`` keyword argument (which it may discard if it wants) to its constructor which can then be inspected/retained on py2.x to get *similar* information as would be automatically included/obtainable in py3.x. :param exc_cls: the exception class to raise (typically one derived from :py:class:`.CausedByException` or equivalent). :param message: the text/str message that will be passed to the exceptions constructor as its first positional argument. :param args: any additional positional arguments to pass to the exceptions constructor. :param kwargs: any additional keyword arguments to pass to the exceptions constructor. .. versionadded:: 1.6 r N)�sys�exc_info�get)Zexc_clsr r �kwargs�exc_type�exc�exc_tbr r r �raise_with_causel s r? c @ s< e Zd ZdZddd�Zdd� Zddd �Zd d � Zd d � ZdS )�save_and_reraise_exceptionaU Save current exception, run some code and then re-raise. In some cases the exception context can be cleared, resulting in None being attempted to be re-raised after an exception handler is run. This can happen when eventlet switches greenthreads or when running an exception handler, code raises and catches an exception. In both cases the exception context will be cleared. To work around this, we save the exception state, run handler code, and then re-raise the original exception. If another exception occurs, the saved exception is logged and the new exception is re-raised. In some cases the caller may not want to re-raise the exception, and for those circumstances this context provides a reraise flag that can be used to suppress the exception. For example:: except Exception: with save_and_reraise_exception() as ctxt: decide_if_need_reraise() if not should_be_reraised: ctxt.reraise = False If another exception occurs and reraise flag is False, the saved exception will not be logged. If the caller wants to raise new exception during exception handling he/she sets reraise to False initially with an ability to set it back to True if needed:: except Exception: with save_and_reraise_exception(reraise=False) as ctxt: [if statements to determine whether to raise a new exception] # Not raising a new exception, so reraise ctxt.reraise = True .. versionchanged:: 1.4 Added *logger* optional parameter. TNc C s0 || _ |d u rt�� }|| _d\| _| _| _d S )N)NNN)�reraise�logging� getLogger�logger�type_�value�tb)r rA rD r r r r � s z#save_and_reraise_exception.__init__c C sv | j d u r | jd u r td��zF| jd u r2| � � | _| jj| jurN| j�| j��| j�W d | _d | _nd | _d | _0 d S )NzDThere is no (currently) captured exception to force the reraising of)rE rF � RuntimeError� __traceback__rG �with_tracebackr r r r � force_reraise� s �z(save_and_reraise_exception.force_reraisec C sD t �� \}}}|r*|d u r*|d u r*td��||| | _| _| _| S )Nz'There is no active exception to capture)r8 r9 rH rE rF rG )r �checkrE rF rG r r r �capture� s z"save_and_reraise_exception.capturec C s | j dd�S )NF)rL )rM r r r r � __enter__� s z$save_and_reraise_exception.__enter__c C sB |d ur0| j r,| j�dt�| j| j| j�� dS | j r>| �� d S )Nz$Original exception being dropped: %sF) rA rD �errorr% �format_exceptionrE rF rG rK �r r< �exc_valr> r r r �__exit__� s ��z#save_and_reraise_exception.__exit__)TN)T) r3 r4 r5 r6 r rK rM rN rS r r r r r@ � s & r@ c s8 � fdd�}� s| s|S t | �dkr0|| d �S |S dS )a� Decorates provided function with infinite retry behavior. The function retry delay is **always** one second unless keyword argument ``retry_delay`` is passed that defines a value different than 1.0 (less than zero values are automatically changed to be 0.0). If repeated exceptions with the same message occur, logging will only output/get triggered for those equivalent messages every 60.0 seconds, this can be altered by keyword argument ``same_log_delay`` to be a value different than 60.0 seconds (exceptions that change the message are always logged no matter what this delay is set to). As in the ``retry_delay`` case if this is less than zero, it will be automatically changed to be 0.0. c sJ t dt��dd����t dt��dd����t�� �� ��fdd��}|S )Ng � retry_delayg �?�same_log_delayg N@c s� d }d}t j�d�}z� | i |��W S ty� } zvt�|�}||krP|d7 }nd}||ksd|�� r�t�d| � |�� s�|� � n|� � d}|}t � �� W Y d }~qd }~0 0 qd S )Nr )�durationr z5Unexpected exception occurred %d time(s)... retrying.) r Z StopWatch� Exceptionr Zexception_to_unicodeZexpiredrB � exceptionZ has_started�startZrestart�time�sleep)r r; Zlast_exc_messageZsame_failure_count�watchr= Zthis_exc_message��infuncrT rU r r �wrapper� s, �� zEforever_retry_uncaught_exceptions.<locals>.decorator.<locals>.wrapper)�max�floatr: � functools�wraps)r^ r_ �r; r] r � decorator� s z4forever_retry_uncaught_exceptions.<locals>.decoratorr r N)r* )r r; re r rd r �!forever_retry_uncaught_exceptions� s # rf c @ s8 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd S ) �exception_filtera| A context manager that prevents some exceptions from being raised. Use this class as a decorator for a function that returns whether a given exception should be ignored, in cases where complex logic beyond subclass matching is required. e.g. >>> @exception_filter >>> def ignore_test_assertions(ex): ... return isinstance(ex, AssertionError) and 'test' in str(ex) The filter matching function can then be used as a context manager: >>> with ignore_test_assertions: ... assert False, 'This is a test' or called directly: >>> try: ... assert False, 'This is a test' ... except Exception as ex: ... ignore_test_assertions(ex) Any non-matching exception will be re-raised. When the filter is used as a context manager, the traceback for re-raised exceptions is always preserved. When the filter is called as a function, the traceback is preserved provided that no other exceptions have been raised in the intervening time. The context manager method is preferred for this reason except in cases where the ignored exception affects control flow. c s. � | _ t� fdd�tjD ��r*t�| � � d S )Nc 3 s | ]}t � |�V qd S r )�hasattr)�.0�a��should_ignore_exr r � <genexpr>D s �z,exception_filter.__init__.<locals>.<genexpr>)�_should_ignore_ex�allrb �WRAPPER_ASSIGNMENTS�update_wrapper)r rl r rk r r A s �zexception_filter.__init__c C s t | �| j�||��S r )r' rn �__get__)r �obj�ownerr r r rr H s zexception_filter.__get__c C s | S r r r r r r rN K s zexception_filter.__enter__c C s |d ur| � |�S d S r )rn rQ r r r rS N s zexception_filter.__exit__c C s| t �� \}}}z`| �|�sf||u rbz2|du r2|� }|j|urF|�|��|�W d}d}qfd}d}0 n|�W ~~~n~~~0 dS )z�Re-raise any exception value not being filtered out. If the exception was the last to be raised, it will be re-raised with its original traceback. N)r8 r9 rn rI rJ )r �exr< rR r% r r r �__call__R s �zexception_filter.__call__N) r3 r4 r5 r6 r rr rN rS rv r r r r rg " s rg )r6 rb r rB r" r8 rZ r% Z oslo_utilsr r r rW r r? �objectr@ rf rg r r r r �<module> s J%U<
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