class CloudFS(LoggingMixIn, Operations): def __init__(self): # initialize file table self.maxFiles = 1024 # self.files = [dict(path=None, dirty=False, data=None)] * self.maxFiles self.files = [None] * self.maxFiles for i in range(0, self.maxFiles): self.files[i] = dict(path=None, dirty=False, data=None) self.conn = Connector() def chmod(self, path, mode): # chmod is not allowed raise FuseOSError(EPERM) def chown(self, path, uid, gid): # chown is not allowed raise FuseOSError(EPERM) def create(self, path, mode): # create file paths = splitPath(path) print path, paths if paths[0] == '': raise FuseOSError(EPERM) # search available fd fd = None fdNum = -1 for i in range(0, self.maxFiles): fd = self.files[i] print i if fd['path'] == None: # print "MATCH!!!" # print fdNum fdNum = i break if fd == None: raise FuseOSError(ENOENT) fd['path'] = path fd['dirty'] = True fd['data'] = '' paths = splitPath(path) self.conn.push(paths[0], paths[1], fd['data']) return fdNum def getattr(self, path, fh=None): now = time() paths = splitPath(path) # if root? if paths[0] == '': return dict(st_mode=(S_IFDIR | 0755), st_ctime=now, st_mtime=now, st_atime=now, st_nlink=2) attr = self.conn.getAttr(paths[0], paths[1]) if attr != None: return attr else: raise FuseOSError(ENOENT) def getxattr(self, path, name, position=0): return '' def listxattr(self, path): raise FuseOSError(EPERM) def mkdir(self, path, mode): paths = splitPath(path) # mkdir is not allowed under root dir if paths[1] == '': raise FuseOSError(EPERM) if self.conn.mkdir(paths[0], paths[1]) != True: raise FuseOSError(EPERM) def open(self, path, flags): paths = splitPath(path) # cannot open files under root dir print path, paths if paths[0] == '': raise FuseOSError(EPERM) # cache file content from storage content = self.conn.pull(paths[0], paths[1]) if paths[0] == None: raise FuseOSError(ENOENT) # search available file fd = None fdNum = -1 for i in range(0, self.maxFiles): fd = self.files[i] if fd['path'] == None: fdNum = i break if fd == None: raise FuseOSError(ENOENT) fd['path'] = path fd['dirty'] = False fd['data'] = content return fdNum def read(self, path, size, offset, fh): if self.files[fh]['path'] == None: raise FuseOSError(ENOENT) return self.files[fh]['data'][offset:offset + size] def readdir(self, path, fh): paths = splitPath(path) if paths[0] == '': dents = self.conn.getConns() else: dents = self.conn.getDents(paths[0], paths[1]) return ['.', '..'] + dents def readlink(self, path): # readlink is not allowed raise FuseOSError(EPERM) def removexattr(self, path, name): raise FuseOSError(EPERM) def rename(self, old, new): # rename is not allowed raise FuseOSError(EPERM) def rmdir(self, path): paths = splitPath(path) # cannot remove mounted dir if paths[1] == '': raise FuseOSError(EPERM) if self.conn.rm(paths[0], paths[1]) != True: raise FuseOSError(ENOENT) def setxattr(self, path, name, value, options, position=0): raise FuseOSError(EPERM) def statfs(self, path): raise FuseOSError(EPERM) def symlink(self, target, source): raise FuseOSError(EPERM) def truncate(self, path, length, fh=0): fd = self.files[self.open(path, 0)] fd['dirty'] = True fd['data'] = fd['data'][:length] def unlink(self, path): paths = splitPath(path) # cannot remove mounted dir if paths[1] == '': raise FuseOSError(EPERM) if self.conn.rm(paths[0], paths[1]) != True: raise FuseOSError(ENOENT) def utimens(self, path, times=None): raise FuseOSError(EPERM) def write(self, path, data, offset, fh): fd = self.files[fh] if fd['path'] == None: raise FuseOSError(ENOENT) # update data and set dirty bit fd['data'] = fd['data'][:offset] + data fd['dirty'] = True return len(data) def release(self, path, fh): fd = self.files[fh] if fd['path'] == None: raise FuseOSError(ENOENT) # write back if dirty is set if fd['dirty'] == True: print '### UPDATE ', path paths = splitPath(path) self.conn.push(paths[0], paths[1], fd['data']) # reset fd fd['path'] = None fd['dirty'] = False fd['data'] = None
