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import os, logging, FuseArchive, zipfile, sha
from binascii import hexlify
def save_chunk( chunk ):
if FuseArchive.magic_profiling:
return( [ 0, 0 ] )
logging.debug( "Begin save_chunk, length: %d" % len( chunk ) )
if FuseArchive.deep_debug:
logging.debug( "Chunk: %s" + hexlify( chunk ) )
# Save this hash string, similar to the backuppc algo
digest = sha.new( chunk ).digest()
# Write out our chunk
chars = list( digest )
logging.debug( chars )
# We make the hexdigest here, yeah we could just call hexdigest()
# but we need to essentially do this same thing to reassemble the
# file anyway
hexdigest = ''.join( [ "%02x" % ord( x ) for x in chars ] )
# Should be about max of 32k zip files
zipname = hexdigest[ 0:4 ] + ".zip"
logging.debug( "Zip name: " + zipname )
if not os.path.exists( "./storage/" + zipname ):
logging.debug( "Creating intial empty zip" )
z = zipfile.ZipFile( "./storage/" + zipname, 'w', zipfile.ZIP_DEFLATED, True )
# append mode throws an exception if it's not zip, or maybe it's
# just zero-length files
z.writestr( 'junk', 'junk' )
z.close()
z = zipfile.ZipFile( "./storage/" + zipname, 'a', zipfile.ZIP_DEFLATED, True )
# Find a chunk slot
sub = 0
while True:
checkpath = "%s_%d" % ( hexdigest, sub )
logging.debug( "Checking: " + checkpath )
try:
data = z.read( checkpath )
except:
data = ''
if len(data):
if data == chunk:
logging.debug( "Found existing block" )
break
else:
logging.debug( "Block exists but is not the same" )
sub += 1
else:
# We found a spot, dump our data here
logging.debug( "No block here, creating new block" )
z.writestr( checkpath, chunk )
break
z.close()
logging.debug( "Got chunk slot: %d" % sub )
return( [ digest, sub ] )
def load_chunk( key ):
if FuseArchive.magic_profiling:
return ''
( thash, seq ) = key
logging.debug( "Begin load_chunk" )
chars = list( thash )
logging.debug( chars )
# Todo: make a digest -> path function to share with deflate
hexdigest = ''.join( [ "%02x" % ord( x ) for x in chars ] )
zipname = hexdigest[ 0:4 ] + ".zip"
logging.debug( "Zip name: " + zipname )
z = zipfile.ZipFile( "./storage/" + zipname, 'r', zipfile.ZIP_DEFLATED, True )
subpath = "%s_%d" % ( hexdigest, seq )
logging.debug( "Chunk path: " + subpath )
data = z.read( subpath )
if len( data ):
logging.debug( "Exporting chunk" )
chunk = data
else:
z.close()
raise IOError
if FuseArchive.deep_debug:
logging.debug( "Load-Chunk: %s" + hexlify( chunk ) )
z.close()
return chunk
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