a
    hX!                     @  s   U d dl mZ d dlZd dlZd dlZd dlmZ d dlmZ zd dl	Z
W n eyh   esdd dl
Z
Y n0 erd dlmZ d dlmZmZ d dlmZ dd	lmZ eeef Zd
ed< G dd dZdS )    )annotationsN)TYPE_CHECKING)atomic_write)Iterator)AnyLiteral)	TypeAlias   )CachingFileSystemr   Detailc                   @  s   e Zd ZdZddddZdddd	d
ZddddddZd0dddddZddddddZdddddZ	ddd d!Z
d"ddd#d$d%Zdd&d'd(d)Zddd*d+Zdddd,d-d.Zd/S )1CacheMetadataa\  Cache metadata.

    All reading and writing of cache metadata is performed by this class,
    accessing the cached files and blocks is not.

    Metadata is stored in a single file per storage directory in JSON format.
    For backward compatibility, also reads metadata stored in pickle format
    which is converted to JSON when next saved.
    z	list[str])storagec                 C  s$   |st d|| _i g| _d| _dS )z

        Parameters
        ----------
        storage: list[str]
            Directories containing cached files, must be at least one. Metadata
            is stored in the last of these directories by convention.
        z3CacheMetadata expects at least one storage locationFN)
ValueError_storagecached_files_force_save_pickle)selfr    r   S/var/www/auris/lib/python3.9/site-packages/fsspec/implementations/cache_metadata.py__init__&   s
    	zCacheMetadata.__init__strr   )fnreturnc                 C  s   z8t |d}t|}W d   n1 s,0    Y  W nF ty~   t |d}t|}W d   n1 sp0    Y  Y n0 | D ]$}t|dtrt	|d |d< q|S )z6Low-level function to load metadata from specific filerNrbblocks)
openjsonloadr   picklevalues
isinstancegetlistset)r   r   fZloadedcr   r   r   _load9   s    ,.zCacheMetadata._loadNone)metadata_to_saver   r   c                 C  sx   | j r<t|}t|| W d   qt1 s00    Y  n8t|dd}t|| W d   n1 sj0    Y  dS )z4Low-level function to save metadata to specific fileNw)mode)r   r   r   dumpr   )r   r)   r   r%   r   r   r   _saveF   s
    
,zCacheMetadata._saveFboolzIterator[tuple[str, str, bool]])writable_onlyr   c                 c  sN   t | j}t| jD ]4\}}||d k}|r2|s2qtj|d||fV  qdS )a  Yield locations (filenames) where metadata is stored, and whether
        writable or not.

        Parameters
        ----------
        writable: bool
            Set to True to only yield writable locations.

        Returns
        -------
        Yields (str, str, bool)
        r	   cacheN)lenr   	enumerateospathjoin)r   r/   nir   writabler   r   r   _scan_locationsO   s    
zCacheMetadata._scan_locationszCachingFileSystem | Nonez#Literal[False] | tuple[Detail, str])r4   cfsr   c                 C  s   t |  | jD ]\\}}}}||vr(q||  }|durv|jrX|d |j|krXq|jrvt |d  |jkrvqt	j
||d }t	j
|r||f  S qdS )zIf path is in cache return its details, otherwise return ``False``.

        If the optional CachingFileSystem is specified then it is used to
        perform extra checks to reject possible matches, such as if they are
        too old.
        Nuidtimer   F)zipr9   r   copyZcheck_filesfsZukeyZexpiryr<   r3   r4   r5   exists)r   r4   r:   r   base_r0   detailr   r   r   
check_filee   s    	zCacheMetadata.check_fileintztuple[list[str], bool])expiry_timer   c                 C  s   g }| j d   D ]h\}}t |d  |kr|dd}|sPtd| tj| j	d |}|
| | j d | q| j d rtj| j	d d}| | j d | | j d  }||fS )zRemove expired metadata from the cache.

        Returns names of files corresponding to expired metadata and a boolean
        flag indicating whether the writable cache is empty. Caller is
        responsible for deleting the expired files.
        r<   r    z)Cache metadata does not contain 'fn' for r0   )r   r>   itemsr<   r"   RuntimeErrorr3   r4   r5   r   appendpopr-   )r   rF   Zexpired_filesr4   rC   r   
cache_pathZwritable_cache_emptyr   r   r   clear_expired   s     

zCacheMetadata.clear_expired)r   c                 C  sP   g }|   D ]2\}}}tj|r4|| | q|i  q|pHi g| _dS )z>Load all metadata from disk and store in ``self.cached_files``N)r9   r3   r4   r@   rK   r'   r   )r   r   r   rB   r   r   r   r      s    zCacheMetadata.loadr   )r%   r4   r   c                 C  s>   | j d | }|d dur:t|d |j |jkr:d|d< dS )zPerform side-effect actions on closing a cached file.

        The actual closing of the file is the responsibility of the caller.
        rG   r   TN)r   r1   	blocksizesize)r   r%   r4   r&   r   r   r   on_close_cached_file   s    $z"CacheMetadata.on_close_cached_filez
str | None)r4   r   c                 C  sR   |  |d}|sdS |\}}|| jd rF| jd | |   ntd|S )zRemove metadata of cached file.

        If path is in the cache, return the filename of the cached file,
        otherwise return ``None``.  Caller is responsible for deleting the
        cached file.
        NrG   z<Can only delete cached file in last, writable cache location)rD   
startswithr   r   rL   savePermissionError)r   r4   detailsrB   r   r   r   r   pop_file   s    
zCacheMetadata.pop_filec           	      C  sN  t |  | jD ]6\\}}}}|s&qtj|r| |}| D ]\}}||v rD|d du sp|| d du rzd|d< n"|| d }||d  ||d< t	|d || d |d< || d |d< qD| D ]\}}||vr|||< qn|}dd | D }|
 D ]&}t|d tr
t|d |d< q
| || || jd< qdS )	zSave metadata to diskr   Tr<   r;   c                 S  s   i | ]\}}||  qS r   )r>   ).0kvr   r   r   
<dictcomp>       z&CacheMetadata.save.<locals>.<dictcomp>rG   N)r=   r9   r   r3   r4   r@   r'   rI   updatemaxr    r!   r$   r#   r-   )	r   r   rB   r8   r0   r   rX   r&   r   r   r   r   rS      s0     

zCacheMetadata.save)r4   rC   r   c                 C  s   || j d |< dS )z8Update metadata for specific file in memory, do not saverG   N)r   )r   r4   rC   r   r   r   update_file   s    zCacheMetadata.update_fileN)F)__name__
__module____qualname____doc__r   r'   r-   r9   rD   rN   r   rQ   rV   rS   r^   r   r   r   r   r      s   

 
$r   )
__future__r   r3   r   r<   typingr   Zfsspec.utilsr   Zujsonr   ImportErrorcollections.abcr   r   r   Ztyping_extensionsr   cachedr
   dictr   r   __annotations__r   r   r   r   r   <module>   s"   