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o ;j� � @ sB d Z ddlZddlZddlmZ G dd� de�ZG dd� d�ZdS )z� :codeauthor: Pedro Algarvio (pedro@algarvio.me) salt.utils.filebuffer ~~~~~~~~~~~~~~~~~~~~~ This utility allows parsing a file in chunks. � N)� SaltExceptionc @ s e Zd ZdZdS )�InvalidFileModezM An invalid file mode was used to open the file passed to the buffer N)�__name__� __module__� __qualname__�__doc__� r r �I/opt/saltstack/salt/lib/python3.10/site-packages/salt/utils/filebuffer.pyr s r c @ sJ e Zd ZdZddd�Zedd� �Zd d � Zd d � ZeZ d d� Z dd� Z dS )�BufferedReadera� This object allows iterating through the contents of a file keeping X configurable bytes in memory which can be used to, for example, do regex search/matching on more than a single line. So, **an imaginary, non accurate**, example could be: 1 - Initiate the BufferedReader filling it to max_in_men: br = [1, 2, 3] 2 - next chunk(pop chunk_size from the left, append chunk_size to the right): br = [2, 3, 4] :type path: str :param path: The file path to be read :type max_in_mem: int :param max_in_mem: The maximum bytes kept in memory while iterating through the file. Default 256KB. :type chunk_size: int :param chunk_size: The size of each consequent read chunk. Default 32KB. :type mode: str :param mode: The mode the file should be opened. **Only read modes**. � � � �rc C sH d|v sd|v r t d��|| _tjj�| j|�| _|| _|| _d | _ d S )N�a�wz(Cannot open file in write or append mode) r Z_BufferedReader__path�salt�utils�filesZfopen�_BufferedReader__file�_BufferedReader__max_in_mem�_BufferedReader__chunk_size�_BufferedReader__buffered)�self�pathZ max_in_memZ chunk_size�moder r r �__init__5 s zBufferedReader.__init__c C s | j S �N)r �r r r r �bufferedA s zBufferedReader.bufferedc C � | S r r r r r r �__iter__F � zBufferedReader.__iter__c C sz | j du r| j| j }d| _ n d}| j | jd� | _ | j�| j| �}tjj�|�}|s3| j� � t �| j |7 _ | j S )z� Return the next iteration by popping `chunk_size` from the left and appending `chunk_size` to the right if there's info on the file left to be read. N� � ) r r r r �readr r Z stringutilsZto_str�close� StopIteration)r Z multiplier�datar r r �nextI s zBufferedReader.nextc C r r r r r r r � __enter__h r zBufferedReader.__enter__c C s | j jdu r | j �� d S d S )NF)r �closedr$ )r �exc_type� exc_value� tracebackr r r �__exit__k s �zBufferedReader.__exit__N)r r r ) r r r r r �propertyr r r' �__next__r( r- r r r r r s r )r Zsalt.utils.filesr Zsalt.utils.stringutilsZsalt.exceptionsr r r r r r r �<module> s
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