def open(self, filesystem, flags): if filesystem.cache.isInCache(self) == False: if self.isOnPersistence(filesystem) == False: print self.getKeyName(), " Is Not on persistence" filesystem.cache.addToCache(self) else: self.readFrom(filesystem) #File in cache, open it up self.iolock.acquire() self.openref = self.openref+1 self.iolock.release() file = os.fdopen(filesystem.cache.openInCache(self,flags),tools.flag2mode(flags)) print "open: ",self.name,'flags',flags,'file',file return file
def open(self, filesystem, flags):
if filesystem.cache.isInCache(self) == False:
if self.isOnPersistence(filesystem) == False:
print self.getKeyName(), " Is Not on persistence"
filesystem.cache.addToCache(self)
else:
self.readFrom(filesystem)
#File in cache, open it up
self.iolock.acquire()
self.openref = self.openref + 1
self.iolock.release()
file = os.fdopen(filesystem.cache.openInCache(self, flags),
tools.flag2mode(flags))
print "open: ", self.name, 'flags', flags, 'file', file
return file
def shadowInCache(self, node):
#Make a shadow copy that dissappears on close
#Must be called with the nodes iolock held
keyname = node.getKeyName()
filename = self.dir + "/" + keyname
origfile = os.fdopen(os.open(filename,os.O_RDWR),flag2mode(os.O_RDWR))
shadowfile = tempfile.TemporaryFile("w+b")
shutil.copyfileobj(origfile,shadowfile)
shadowfile.seek(0)
origfile.seek(0)
sum = hashlib.sha256()
end = False
while end == False:
buf = origfile.read(4096)
if (len(buf) == 0):
end = True
else:
sum.update(buf)
origfile.close()
node.sha_sum = base64.urlsafe_b64encode(sum.digest())
return shadowfile
def addToCache(self, node, flags=(os.O_RDWR|os.O_CREAT)): keyname = node.getKeyName() fd = os.fdopen(os.open(self.dir + "/" + keyname, flags),flag2mode(flags)) fd.close() self.lru_list.append(keyname) return 0
