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� �mec @ sk d Z d d l Z d d l Z d d l Z e j Z d Z e Z d e j f d � � YZ d d d � Z d S( s� A dumb and slow but simple dbm clone. For database spam, spam.dir contains the index (a text file), spam.bak *may* contain a backup of the index (also a text file), while spam.dat contains the data (a binary file). XXX TO DO: - seems to contain a bug when updating... - reclaim free space (currently, space once occupied by deleted or expanded items is never reused) - support concurrent access (currently, if two processes take turns making updates, they can mess up the index) - support efficient access to large databases (currently, the whole index is read when the database is opened, and some updates rewrite the whole index) - support opening for read-only (flag = 'm') i����Ni t _Databasec B s� e Z e Z e Z d � Z d � Z d � Z e Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z e Z d � Z d � Z e Z d � Z RS( c C s� | | _ | t j d | _ | t j d | _ | t j d | _ d | _ y t | j d � } Wn3 t k r� t | j d � } | j | j � n X| j � | j � d S( Nt dirt datt bakt rt w( t _modet _ost extsept _dirfilet _datfilet _bakfilet Nonet _indext _opent IOErrort _chmodt closet _update( t selft filebasenamet modet f( ( s /usr/lib64/python2.7/dumbdbm.pyt __init__/ s c C sz i | _ y t | j � } Wn t k r/ nG Xx9 | D]1 } | j � } t | � \ } } | | j | <q7 W| j � d S( N( R R R R t rstript evalR ( R R t linet keyt pos_and_siz_pair( ( s /usr/lib64/python2.7/dumbdbm.pyR M s c C s� | j d k r d Sy | j j | j � Wn | j j k rC n Xy | j j | j | j � Wn | j j k rz n X| j | j d � } | j | j � x4 | j j � D]# \ } } | j d | | f � q� W| j � d S( NR s %r, %r ( R R R t unlinkR t errort renameR R R t iteritemst writeR ( R R R R ( ( s /usr/lib64/python2.7/dumbdbm.pyt _commit] s c C sO | j | \ } } t | j d � } | j | � | j | � } | j � | S( Nt rb( R R R t seekt readR ( R R t post sizR R ( ( s /usr/lib64/python2.7/dumbdbm.pyt __getitem__v s c C s� t | j d � } | j d d � t | j � � } | t d t t } | j d | | � | } | j | � | j � | t | � f S( Ns rb+i i i t ( R R R$ t intt tellt _BLOCKSIZER! R t len( R t valR R& t npos( ( s /usr/lib64/python2.7/dumbdbm.pyt _addval� s c C sF t | j d � } | j | � | j | � | j � | t | � f S( Ns rb+( R R R$ R! R R- ( R R& R. R ( ( s /usr/lib64/python2.7/dumbdbm.pyt _setval� s c C sT | | j | <t | j d � } | j | j � | j d | | f � | j � d S( Nt as %r, %r ( R R R R R! R ( R R R R ( ( s /usr/lib64/python2.7/dumbdbm.pyt _addkey� s c C s� t | � t d � k o) t | � k n s: t d � n | | j k re | j | | j | � � n{ | j | \ } } | t d t } t | � t d t } | | k r� | j | | � | j | <n | j | � | j | <d S( Nt s keys and values must be stringsi ( t typet TypeErrorR R3 R0 R, R- R1 ( R R R. R& R' t oldblockst newblocks( ( s /usr/lib64/python2.7/dumbdbm.pyt __setitem__� s . c C s | j | =| j � d S( N( R R" ( R R ( ( s /usr/lib64/python2.7/dumbdbm.pyt __delitem__� s c C s | j j � S( N( R t keys( R ( ( s /usr/lib64/python2.7/dumbdbm.pyR; � s c C s | | j k S( N( R ( R R ( ( s /usr/lib64/python2.7/dumbdbm.pyt has_key� s c C s | | j k S( N( R ( R R ( ( s /usr/lib64/python2.7/dumbdbm.pyt __contains__� s c C s | j j � S( N( R t iterkeys( R ( ( s /usr/lib64/python2.7/dumbdbm.pyR> � s c C s t | j � S( N( R- R ( R ( ( s /usr/lib64/python2.7/dumbdbm.pyt __len__� s c C s, | j � d | _ | _ | _ | _ d S( N( R" R R R R R ( R ( ( s /usr/lib64/python2.7/dumbdbm.pyR � s c C s/ t | j d � r+ | j j | | j � n d S( Nt chmod( t hasattrR R@ R ( R t file( ( s /usr/lib64/python2.7/dumbdbm.pyR � s ( t __name__t __module__R R R R R" t syncR( R0 R1 R3 R9 R: R; R< R= R> t __iter__R? R t __del__R ( ( ( s /usr/lib64/python2.7/dumbdbm.pyR " s* i� c C sL y t j d � } t j | � Wn t k r3 n X| | @} t | | � S( s� Open the database file, filename, and return corresponding object. The flag argument, used to control how the database is opened in the other DBM implementations, is ignored in the dumbdbm module; the database is always opened for update, and will be created if it does not exist. The optional mode argument is the UNIX mode of the file, used only when the database has to be created. It defaults to octal code 0666 (and will be modified by the prevailing umask). i ( R t umaskt AttributeErrorR ( RB t flagR t um( ( s /usr/lib64/python2.7/dumbdbm.pyt open� s ( t __doc__t osR t __builtin__t UserDictRL R R, R R t DictMixinR R ( ( ( s /usr/lib64/python2.7/dumbdbm.pyt <module> s �