def blockComputeFile( self, filename ):
digest = ""
if os.path.exists( filename ):
size = os.path.getsize( filename )
if size == 0 :
digest = self._zeroHash
else:
h = hashlib.sha256()
remainder = size % self._blockSize
count = size / self._blockSize
if remainder > 0 :
count = count + 1
try:
with open( filename, "rb" ) as f:
for _ in xrange( count ) :
h.update( f.read( self._blockSize ))
if self._delay > 0 :
time.sleep( self._delay )
digest = h.hexdigest()
except ( IOError, EOFError, OSError, SystemError) as e :
debug.debug( "BlockComputeFile exception: %s" % e )
digest = None
return digest
def addFile(self, p ):
sha256 = ""
timing = timer.Timer()
try:
debug.debug( "%s : %i" % ( p, os.path.getsize( p )))
timing.start()
sha256 = self._checksum.blockComputeFile( p )
timing.stop()
debug.debug( "sha256 : %s" % ( sha256 ))
except ( IOError, EOFError, OSError, SystemError) as error:
sha256 = "" #if the file goes away ignore that
print "exception thrown in checksum calculation: %s for %s" % ( error, p )
self._filesCollection.updateChecksum( p, sha256, timing.elapsed())
def addFile(self, p):
if not os.path.islink(p):
return self._filesCollection.addFile(p)
else:
debug.debug("%s : is a symlink" % p)
return None
