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ƒZ< h Z= xC e* d< ƒ D]5 Z> d= e? e@ e> ƒ ƒ e> eA e> ƒ f e= eB e> ƒ GHd? e. eD f GHn qIWd@ GHe< i1 ƒ \ Z2 Z3 Z4 d. e5 e2 ƒ e5 e3 ƒ e5 e4 ƒ f GHd/ Ge< i6 i7 Gd0 Ge< i6 i8 GHd1 Ge< i9 i7 Gd0 Ge< i9 i8 GHH[) [< n d S(A s´ BeeStorage - Flatfile data storage facility.
Definitions:
block: minimal amount of storage allocated in the file
record: Header + content + padding
Copyright (c) 1998-2000, Marc-Andre Lemburg; mailto:mal@lemburg.com
Copyright (c) 2000-2008, eGenix.com Software GmbH; mailto:info@egenix.com
See the documentation for further information on copyrights,
or contact the author. All Rights Reserved.
iÿÿÿÿN( t Tools( t *i i iè s Ûs øs ûs *cold***s *hot****i i t Errorc B s e Z d Z RS( s2 Baseclass for Errors related to this module.
( t __name__t
__module__t __doc__( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR < s t RunRecoveryErrorc B s e Z d Z RS( s^ Error raised in case the storage file is damaged and recovery
could be possible.
( R R R ( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR B s c C s d S( sü This callback is used by the .collect() method to
inform an object using the storage facility of a change
in record layout.
raw_data contains the raw data contents of the record.
Use storage.decode() to decode it.
N( ( t old_positiont new_positiont raw_data( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt dummy_callbackK s t
BeeStoragec B s e Z d Z d Z d Z d Z d Z d Z e Z
d Z d Z d Z
d Z d Z d Z d d e d d d „ Z e e e e e d „ Z e d „ Z e d „ Z e d „ Z d „ Z e i d ƒ Z d
„ Z e! i" e# d „ Z$ d „ Z% d
„ Z& e e' d „ Z( d „ Z) d „ Z* d „ Z+ e, i- e. e/ e0 e1 f d „ Z2 e1 e, i3 e4 i5 e/ e d „ Z6 d e1 e. e, i3 e4 i5 e/ e d „ Z7 e1 d „ Z8 e0 e d „ Z9 e9 Z: e9 Z; d d „ Z< e< Z= e< Z> d „ Z? e@ iA d „ ZB eB ZC eD eE iF d „ ZG d „ ZH e d d „ ZI d d d „ ZJ RS( s¾ Baseclass for flatfile data storage facilities.
This class implements a simple database which can store and
restore objects. The database is designed to be easily
reconstructable in case something goes terribly wrong.
File layout:
· [Fileheader] (length FILEHEADERSIZE)
· [Marker block] (length BLOCKSIZE)
· STARTOFDATA: ...[datablock] (length mulitple of BLOCKSIZE)...
Datablocks layout:
· [ID] (1 byte)
· [length of whole block] (4 bytes, little endian)
· [CODE] (1 bytes)
· [raw data]
XXX Todo:
* Implement write cache.
* Add more recovery tools
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t' | ƒ ‚ n t | _( | i) | ƒ d S( s» Create an instance using filename as data file.
If lock is true, a filelock will be enabled until the file
is closed. cache controls whether to enable a cache or not
(should only be used where OS level caches are not
available).
min_recordsize can be set to have all records be padded to
at least this size (might reduce overhead due to
reallocation of records that have become too small for
updates).
readonly can be set to true to have existing files opened
in read-only mode. Writes will then cause an IOError,
opening a non-existing file in read-only mode will too.
Opening the storage file in recover mode will disable some
of the checks normally done. This flag should only be used
if a previous normal opening failed with a hint to run
recovery.
i i t rbs r+bi s Creating a new storage file %ss w+bt s0 storage file is damaged; run recovery ! (EOF=%i)s3 storage file is damaged; run recovery ! (marker=%s)N(* t readonlyt _debugt logt callt SYSTEM_DEBUGt
MINRECORDSIZEt BLOCKSIZEt min_recordsizet FileLockt filelockt lockR t remove_lockt filenamet opent filet seekt tellt EOFt IOErrort SYSTEM_INFOt write_fileheadert markt COLDt writet is_newt cachingt Cachet MAXCACHESIZEt header_cachet
CACHELIMITt record_cachet cachesR t FILEHEADERSIZEt readt lent COLD_MARKERt
HOT_MARKERt reprt statet check_fileheader( t selfR R t cacheR R t recoverR t modeR R t whyR* R, t marker( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt __init__„ sv
c C s¬ | i | j o d S| i o
t d ‚ n t o+ t t d | i | | j d p d ƒ n | i i | ƒ | | j o | i i | ƒ n | i i | ƒ | | _ d S( s[ Change the state of the storage file.
The state indicates whether the file has changed in
a way that needs proper shutdown (HOT). An unchanged
or stable file should be marked COLD.
This is an internal interface, use .start/end_transaction()
for externally setting the state.
Ns storage is read-onlys Marking the file "%s": %st HOTR$ (
R4 R R R R R R R R R% ( R6 R4 R= R2 R1 R. ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR# õ s
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c C s | i | d d ƒd S( sC Run recovery.
callback is a call back function that will be called for
every valid record and has the same signature as the one
used for .collect().
To open a storage file in recovery mode, pass the keyword
'recover=1' to the constructor.
R8 i N( t collect( R6 t callback( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR8 s c C s | i | ƒ d S( s¥ Start a sequence of storage manipulation commands.
Note that every write/free command automatically starts
a transaction sequence.
N( R# ( R6 R= ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt start_transaction! s c C s | i | ƒ d S( s: End a sequence of storage manipulation commands.
N( R# ( R6 R$ ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt end_transaction, s c C s d | i i | i t f } | d t t | ƒ d d } t t d j o" | d t t d t t } n | i d ƒ | i | ƒ d S( sª Write a new header to the open file.
Changes the file's position: moves the file's position to
the start of the data area.
s %s version %s
blocksize %i
R
i s
i t N( t __class__R t versionR R. R0 R R% ( R6 R t
fileheader( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR" 4 s
s' (\w+) version ([\w.]+)
blocksize (\d+)
c C s | i d ƒ | i t ƒ } t | ƒ t j o t d | ‚ n | i i | ƒ } | d j o t d | ‚ n | i ƒ \ } } } | | i i
j o t d | | i i
f ‚ n | | i j o t d | | i f ‚ n t i
| ƒ t j o t d | t f ‚ n d S( s… Checks the file header and verifies that all parameters are
the same.
Changes the file's position.
i s header is damaged: "%s"s wrong header format: "%s"s% wrong storage class: %s (expected %s)s wrong version: %s (expected %s)s$ blocksize mismatch: %s (expected %i)N( R R/ R. R0 R t header_checkt matcht Nonet groupsRC R RD t stringt atoiR ( R6 R RE t mt nameRD t blocksize( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR5 P s"
c C s
t d ‚ d S( sE Encode an object giving a string.
Since the records are usually larger than the data size,
it is important to store the string length or at least
mark the end of data in some way.
This method must be overloaded in order to implement
an encoding schemes.
s .encode() needs to be overriddenN( R ( R6 t objectt
StringTypet type( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt encodei s
c C s
t d ‚ d S( sD Decode a string giving an object.
The data string may well be larger than the string
returned by the .encode method. This method will have to
determine the true length on its own.
This method must be overloaded in order to implement
an encoding scheme.
s .decode() needs to be overriddenN( R ( R6 t data( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt decodex s c C s% | i o t | i d d ƒ n d S( sQ Clears the caches used (flushing any data not yet
written).
t clearN( ( R' t
method_mapplyR- ( R6 ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt clear_cache… s
c C s | i o! | i ƒ | | i d d ƒ n | i o6 | i o! | i | j o | i | ƒ n | ` n | i o | i i ƒ | ` n d S( s6 Flush buffers and close the associated file.
RU N( ( R' t flushR- R R R4 R# R t unlock( R6 R$ RV ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt closeŽ s
c C s7 t o t t d | ƒ n | i o | i ƒ n d S( Ns del %s( R R R R RZ ( R6 ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt __del__ s
c C s d S( s Flush all buffers.
N( ( R6 ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyRX § s c C s d | i i | i t | ƒ f S( Ns <%s instance for "%s" at 0x%x>( RC R R t id( R6 ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt __repr__ s c C sM | i o? | i i | d ƒ } | d j o | i i | d ƒ | Sn | | d j p | | i j o t d | ‚ n | i } | i | ƒ | i d ƒ } | p t d | ‚ n | d | j p | d | j o t d | t
| ƒ f ‚ n | d | d d !ƒ d } | | d | d f } | i o | i i | | ƒ n | S(
sÊ Read the header located at position and return
a tuple (record size, statebyte, data area size).
statebyte is one of the state constants. record size
is the total number of bytes reserved for the record,
data area size the number of bytes in its data area.
self.file is positioned to point to the records data area.
May raise errors if the position is invalid.
i i s invalid position: %is position %i is beyond EOFi s invalid header at %i: %ss è sz
i c C sš | p | i d } n t | d ƒ } | i t j o | i t ƒ n | i } | i d ƒ x+ | i | ƒ } | p Pn | i | ƒ qa | i ƒ d S( sM Issues a backup request using archiveext as filename
extension.
The archive file is a simple copy of the current storage
file. If no name is given self.filename + '.backup' is
used.
buffersize gives the size of the buffer used for copying
the file.
s .backupt wbi N(
R R R4 R= R# R R R/ R% RZ ( R6 t archivet
buffersizet archfileR t buffer( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt backupT s
N(K R R R RD RH R R R R R R R' R R4 R& R* R, R< R= R2 R1 R. R# R
R8 R@ R$ RA R" t ret compileRF R5 t typesRP RQ RR RT RW RV RZ R[ RX R] t structRb R Rc Rv Rm Rg Rj RJ Rk Rl Rr Rt Rn Ru t __delitem__R% R{ t addRx R( Ry R/ t __getitem__Rz t syst maxintR„ R… R> R’ ( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR V sj p
) E * lt PickleMixinc B s, e Z d Z e i d „ Z e i d „ Z RS( s4 Pickle encoding.
Uses binary pickles.
c C s
| | d ƒ S( s Encode an object giving a string.
This method can be overloaded in order to implement
other encoding schemes.
i ( ( R6 RO t dumps( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyRR { s c C s
| | ƒ S( s Decode a string giving an object.
This method can be overloaded in order to implement
other encoding schemes.
( ( R6 RO t loads( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyRT † s ( R R R t cPickleR RR Rž RT ( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyRœ u s t BeePickleStoragec B s e Z d Z RS( s< Flatfile data storage facility for pickleable objects.
( R R R ( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR ‘ s t MarshalMixinc B s, e Z d Z e i d „ Z e i d „ Z RS( s Marshal encoding.
c C s
| | ƒ S( s Encode an object giving a string.
This method can be overloaded in order to implement
other encoding schemes.
( ( R6 RO R ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyRR Ÿ s c C s
| | ƒ S( s Decode a string giving an object.
This method can be overloaded in order to implement
other encoding schemes.
( ( R6 RO Rž ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyRT ª s ( R R R t marshalR RR Rž RT ( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR¡ š s t BeeMarshalStoragec B s e Z d Z RS( s> Flatfile data storage facility for marshallable objects.
( R R R ( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR£ µ s t BeeKeyValueStoragec B s‰ e Z d Z d Z d „ Z d e i d „ Z e Z e Z
e i d „ Z e i
e i d „ Z e i
e i e i d „ Z e Z d „ Z RS( s‘ Flatfile storage for key,value pairs.
keys and values must be pickleable object.
The main difference between this class and the base class
is that keys are readable separately from the values, e.g.
values can be multi-MB big and are only read if this is really
requested.
NOTE: The .en/decode methods are NOT used. Uses binary
pickles.
c O sU t t i | f | | ƒ | i o- t i t t ƒ | _ } | i i | ƒ n d S( N(
t applyR R< R' R( R) R+ t key_cacheR- R{ ( R6 t argst kwsR¦ ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR< Ï s
c C s€ | | d ƒ | | d ƒ } | d j o
| i } n | i | | ƒ } | i o* | i i | | ƒ | i i | | ƒ n | S( s Write key and value to position. Returns the position under
which the record was stored.
If position is None, the implementation chooses a new
one.
i N( RH R Rr R' R, R` R¦ ( R6 t keyt valueRa R RS ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR% Ö s
c C s
| | ƒ S( s9 Decode the key part of a raw data record field.
( ( R6 R Rž ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt
decode_keyò s c C sv | i o+ | i i | | ƒ } | | j o | Sn | i | ƒ | | i ƒ } | i o | i i | | ƒ n | S( sY Load the key part of an object from the file at the given
position.
( R' R¦ R^ Rg R R` ( R6 Ra t loadRy R© ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt read_keyú s
c C s | i oU | i i | | ƒ } | | j o/ | | ƒ } | | ƒ } | | ƒ } | | f Sn | i | ƒ \ } }
} | i o] | i | ƒ } | | ƒ } | | ƒ } | | ƒ } | i i | | ƒ | i i | | ƒ n" | i } | | ƒ } | | ƒ } | | f S( sl Load an object from the file at the given position and
return it as tuple (key,value).
( R' R, R^ Rg R/ R` R¦ R ( R6 Ra R¬ t StringIORy RŒ R R© RS Rf Ri Rq ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR/ s&
c C s | i | ƒ d S( s[ Load the value part of an object from the file at the given
position.
i ( R/ ( R6 Ra ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt
read_value3 s N( R R R RH R¦ R< RŸ R R% R{ R˜ Rž R« R¬ R( Ry R t cStringIOR® R/ R™ R¯ ( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyR¤ ¾ s t __main__s test-BeePickleStorage.datR7 R t blablas Hi thereg:’ËH¿@i y @s BeePickleStorage:
s Results differ:s orig:s rest:s BeePickleStorage works.s% %i valid records, %i old, %i invalids r cache hits:s misses:s h cache hits:s rewrite...t xid c C s t i | | ƒ S( ( t fR% ( Rª t oldpos( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt R s s Results differ:s orig:s rest:s collect...c C s | i | ƒ } | | | t gt dt iR3 t chrt octt strt itemst vR{ t addr( ( ( s; /usr/lib64/python2.6/site-packages/mx/BeeBase/BeeStorage.pyt s l
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