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cloudfs.py
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cloudfs.py
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#!/usr/bin/env python
from collections import defaultdict
from errno import *
from stat import S_IFDIR, S_IFLNK, S_IFREG
from sys import argv, exit
from time import time
from fusepy.fuse import FUSE, FuseOSError, Operations, LoggingMixIn
from connector import Connector
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
# split given path to mounted dir and real path
def splitPath(path):
s = path.split('/')
return [s[1], '/' + '/'.join(s[2:])]
if __name__ == "__main__":
if len(argv) != 2:
print 'usage: %s <mountpoint>' % argv[0]
exit(1)
fuse = FUSE(CloudFS(), argv[1], foreground=True)