nfsclient.py :  » Language-Interface » ChinesePython » chinesepython2.1.3-0.4 » Demo » rpc » Python Open Source

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Python Open Source » Language Interface » ChinesePython 
ChinesePython » chinesepython2.1.3 0.4 » Demo » rpc » nfsclient.py
# NFS RPC client -- RFC 1094

# XXX This is not yet complete.
# XXX Only GETATTR, SETTTR, LOOKUP and READDIR are supported.

# (See mountclient.py for some hints on how to write RPC clients in
# Python in general)

import rpc
from rpc import UDPClient,TCPClient
from mountclient import FHSIZE,MountPacker,MountUnpacker

NFS_PROGRAM = 100003
NFS_VERSION = 2

# enum stat
NFS_OK = 0
# (...many error values...)

# enum ftype
NFNON = 0
NFREG = 1
NFDIR = 2
NFBLK = 3
NFCHR = 4
NFLNK = 5


class NFSPacker(MountPacker):

  def pack_sattrargs(self, sa):
    file, attributes = sa
    self.pack_fhandle(file)
    self.pack_sattr(attributes)

  def pack_sattr(self, sa):
    mode, uid, gid, size, atime, mtime = sa
    self.pack_uint(mode)
    self.pack_uint(uid)
    self.pack_uint(gid)
    self.pack_uint(size)
    self.pack_timeval(atime)
    self.pack_timeval(mtime)

  def pack_diropargs(self, da):
    dir, name = da
    self.pack_fhandle(dir)
    self.pack_string(name)

  def pack_readdirargs(self, ra):
    dir, cookie, count = ra
    self.pack_fhandle(dir)
    self.pack_uint(cookie)
    self.pack_uint(count)

  def pack_timeval(self, tv):
    secs, usecs = tv
    self.pack_uint(secs)
    self.pack_uint(usecs)


class NFSUnpacker(MountUnpacker):

  def unpack_readdirres(self):
    status = self.unpack_enum()
    if status == NFS_OK:
      entries = self.unpack_list(self.unpack_entry)
      eof = self.unpack_bool()
      rest = (entries, eof)
    else:
      rest = None
    return (status, rest)

  def unpack_entry(self):
    fileid = self.unpack_uint()
    name = self.unpack_string()
    cookie = self.unpack_uint()
    return (fileid, name, cookie)

  def unpack_diropres(self):
    status = self.unpack_enum()
    if status == NFS_OK:
      fh = self.unpack_fhandle()
      fa = self.unpack_fattr()
      rest = (fh, fa)
    else:
      rest = None
    return (status, rest)

  def unpack_attrstat(self):
    status = self.unpack_enum()
    if status == NFS_OK:
      attributes = self.unpack_fattr()
    else:
      attributes = None
    return status, attributes

  def unpack_fattr(self):
    type = self.unpack_enum()
    mode = self.unpack_uint()
    nlink = self.unpack_uint()
    uid = self.unpack_uint()
    gid = self.unpack_uint()
    size = self.unpack_uint()
    blocksize = self.unpack_uint()
    rdev = self.unpack_uint()
    blocks = self.unpack_uint()
    fsid = self.unpack_uint()
    fileid = self.unpack_uint()
    atime = self.unpack_timeval()
    mtime = self.unpack_timeval()
    ctime = self.unpack_timeval()
    return (type, mode, nlink, uid, gid, size, blocksize, \
      rdev, blocks, fsid, fileid, atime, mtime, ctime)

  def unpack_timeval(self):
    secs = self.unpack_uint()
    usecs = self.unpack_uint()
    return (secs, usecs)


class NFSClient(UDPClient):

  def __init__(self, host):
    UDPClient.__init__(self, host, NFS_PROGRAM, NFS_VERSION)

  def addpackers(self):
    self.packer = NFSPacker()
    self.unpacker = NFSUnpacker('')

  def mkcred(self):
    if self.cred == None:
      self.cred = rpc.AUTH_UNIX, rpc.make_auth_unix_default()
    return self.cred

  def Getattr(self, fh):
    return self.make_call(1, fh, \
      self.packer.pack_fhandle, \
      self.unpacker.unpack_attrstat)

  def Setattr(self, sa):
    return self.make_call(2, sa, \
      self.packer.pack_sattrargs, \
      self.unpacker.unpack_attrstat)

  # Root() is obsolete

  def Lookup(self, da):
    return self.make_call(4, da, \
      self.packer.pack_diropargs, \
      self.unpacker.unpack_diropres)

  # ...

  def Readdir(self, ra):
    return self.make_call(16, ra, \
      self.packer.pack_readdirargs, \
      self.unpacker.unpack_readdirres)

  # Shorthand to get the entire contents of a directory
  def Listdir(self, dir):
    list = []
    ra = (dir, 0, 2000)
    while 1:
      (status, rest) = self.Readdir(ra)
      if status <> NFS_OK:
        break
      entries, eof = rest
      last_cookie = None
      for fileid, name, cookie in entries:
        list.append((fileid, name))
        last_cookie = cookie
      if eof or last_cookie == None:
        break
      ra = (ra[0], last_cookie, ra[2])
    return list

  
def test():
  import sys
  if sys.argv[1:]: host = sys.argv[1]
  else: host = ''
  if sys.argv[2:]: filesys = sys.argv[2]
  else: filesys = None
  from mountclient import UDPMountClient,TCPMountClient
  mcl = TCPMountClient(host)
  if filesys == None:
    list = mcl.Export()
    for item in list:
      print item
    return
  sf = mcl.Mnt(filesys)
  print sf
  fh = sf[1]
  if fh:
    ncl = NFSClient(host)
    as = ncl.Getattr(fh)
    print as
    list = ncl.Listdir(fh)
    for item in list: print item
    mcl.Umnt(filesys)
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