/usr/lib/python2.7/dist-packages/gluster/gfapi.py is in glusterfs-common 3.5.2-2+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from ctypes import *
from ctypes.util import find_library
import os
import sys
import time
import types
# Looks like ctypes is having trouble with dependencies, so just force them to
# load with RTLD_GLOBAL until I figure that out.
glfs = CDLL(find_library("glusterfs"),RTLD_GLOBAL)
xdr = CDLL(find_library("gfxdr"),RTLD_GLOBAL)
api = CDLL(find_library("gfapi"),RTLD_GLOBAL)
# Wow, the Linux kernel folks really play nasty games with this structure. If
# you look at the man page for stat(2) and then at this definition you'll note
# two discrepancies. First, we seem to have st_nlink and st_mode reversed. In
# fact that's exactly how they're defined *for 64-bit systems*; for 32-bit
# they're in the man-page order. Even uglier, the man page makes no mention of
# the *nsec fields, but they are very much present and if they're not included
# then we get memory corruption because libgfapi has a structure definition
# that's longer than ours and they overwrite some random bit of memory after
# the space we allocated. Yes, that's all very disgusting, and I'm still not
# sure this will really work on 32-bit because all of the field types are so
# obfuscated behind macros and feature checks.
class Stat (Structure):
_fields_ = [
("st_dev", c_ulong),
("st_ino", c_ulong),
("st_nlink", c_ulong),
("st_mode", c_uint),
("st_uid", c_uint),
("st_gid", c_uint),
("st_rdev", c_ulong),
("st_size", c_ulong),
("st_blksize", c_ulong),
("st_blocks", c_ulong),
("st_atime", c_ulong),
("st_atimensec", c_ulong),
("st_mtime", c_ulong),
("st_mtimensec", c_ulong),
("st_ctime", c_ulong),
("st_ctimensec", c_ulong),
]
api.glfs_creat.restype = c_void_p
api.glfs_open.restype = c_void_p
api.glfs_lstat.restype = c_int
api.glfs_lstat.argtypes = [c_void_p, c_char_p, POINTER(Stat)]
class Dirent (Structure):
_fields_ = [
("d_ino", c_ulong),
("d_off", c_ulong),
("d_reclen", c_ushort),
("d_type", c_char),
("d_name", c_char * 256),
]
api.glfs_opendir.restype = c_void_p
api.glfs_readdir_r.restype = c_int
api.glfs_readdir_r.argtypes = [c_void_p, POINTER(Dirent),
POINTER(POINTER(Dirent))]
# There's a bit of ctypes glitchiness around __del__ functions and module-level
# variables. If we unload the module while we still have references to File or
# Volume objects, the module-level variables might have disappeared by the time
# __del__ gets called. Therefore the objects hold references which they
# release when __del__ is done. We only actually use the object-local values
# in __del__; for clarity, we just use the simpler module-level form elsewhere.
class File(object):
def __init__ (self, fd):
# Add a reference so the module-level variable "api" doesn't
# get yanked out from under us (see comment above File def'n).
self._api = api
self.fd = fd
def __del__ (self):
self._api.glfs_close(self.fd)
self._api = None
# File operations, in alphabetical order.
def fsync (self):
return api.glfs_fsync(self.fd)
def read (self, buflen, flags=0):
rbuf = create_string_buffer(buflen)
rc = api.glfs_read(self.fd,rbuf,buflen,flags)
if rc > 0:
return rbuf.value[:rc]
else:
return rc
def read_buffer (self, buf, flags=0):
return api.glfs_read(self.fd,buf,len(buf),flags)
def write (self, data, flags=0):
return api.glfs_write(self.fd,data,len(data),flags)
def fallocate (self, mode, offset, len):
return api.glfs_fallocate(self.fd, mode, offset, len)
def discard (self, offset, len):
return api.glfs_discard(self.fd, offset, len)
class Dir(object):
def __init__ (self, fd):
# Add a reference so the module-level variable "api" doesn't
# get yanked out from under us (see comment above File def'n).
self._api = api
self.fd = fd
self.cursor = POINTER(Dirent)()
def __del__ (self):
self._api.glfs_closedir(self.fd)
self._api = None
def next (self):
entry = Dirent()
entry.d_reclen = 256
rc = api.glfs_readdir_r(self.fd,byref(entry),byref(self.cursor))
if (rc < 0) or (not self.cursor) or (not self.cursor.contents):
return rc
return entry
class Volume(object):
# Housekeeping functions.
def __init__ (self, host, volid, proto="tcp", port=24007):
# Add a reference so the module-level variable "api" doesn't
# get yanked out from under us (see comment above File def'n).
self._api = api
self.fs = api.glfs_new(volid)
api.glfs_set_volfile_server(self.fs,proto,host,port)
def __del__ (self):
self._api.glfs_fini(self.fs)
self._api = None
def set_logging (self, path, level):
api.glfs_set_logging(self.fs,path,level)
def mount (self):
api.glfs_init(self.fs)
# File operations, in alphabetical order.
def creat (self, path, flags, mode):
fd = api.glfs_creat(self.fs,path,flags,mode)
if not fd:
return fd
return File(fd)
def getxattr (self, path, key, maxlen):
buf = create_string_buffer(maxlen)
rc = api.glfs_getxattr(self.fs,path,key,buf,maxlen)
if rc < 0:
return rc
return buf.value[:rc]
def listxattr (self, path):
buf = create_string_buffer(512)
rc = api.glfs_listxattr(self.fs,path,buf,512)
if rc < 0:
return rc
xattrs = []
# Parsing character by character is ugly, but it seems like the
# easiest way to deal with the "strings separated by NUL in one
# buffer" format.
i = 0
while i < rc:
new_xa = buf.raw[i]
i += 1
while i < rc:
next_char = buf.raw[i]
i += 1
if next_char == '\0':
xattrs.append(new_xa)
break
new_xa += next_char
xattrs.sort()
return xattrs
def lstat (self, path):
x = Stat()
rc = api.glfs_lstat(self.fs,path,byref(x))
if rc >= 0:
return x
else:
return rc
def mkdir (self, path):
return api.glfs_mkdir(self.fs,path)
def open (self, path, flags):
fd = api.glfs_open(self.fs,path,flags)
if not fd:
return fd
return File(fd)
def opendir (self, path):
fd = api.glfs_opendir(self.fs,path)
if not fd:
return fd
return Dir(fd)
def rename (self, opath, npath):
return api.glfs_rename(self.fs,opath,npath)
def rmdir (self, path):
return api.glfs_rmdir(self.fs,path)
def setxattr (self, path, key, value, vlen):
return api.glfs_setxattr(self.fs,path,key,value,vlen,0)
def unlink (self, path):
return api.glfs_unlink(self.fs,path)
if __name__ == "__main__":
def test_create_write (vol, path, data):
mypath = path + ".io"
fd = vol.creat(mypath,os.O_WRONLY|os.O_EXCL,0644)
if not fd:
return False, "creat error"
rc = fd.write(data)
if rc != len(data):
return False, "wrote %d/%d bytes" % (rc, len(data))
return True, "wrote %d bytes" % rc
# TBD: this test fails if we do create, open, write, read
def test_open_read (vol, path, data):
mypath = path + ".io"
fd = vol.open(mypath,os.O_RDONLY)
if not fd:
return False, "open error"
dlen = len(data) * 2
buf = fd.read(dlen)
if type(buf) == types.IntType:
return False, "read error %d" % buf
if len(buf) != len(data):
return False, "read %d/%d bytes" % (len(buf), len(data))
return True, "read '%s'" % buf
def test_lstat (vol, path, data):
mypath = path + ".io"
sb = vol.lstat(mypath)
if type(sb) == types.IntType:
return False, "lstat error %d" % sb
if sb.st_size != len(data):
return False, "lstat size is %d, expected %d" % (
sb.st_size, len(data))
return True, "lstat got correct size %d" % sb.st_size
def test_rename (vol, path, data):
opath = path + ".io"
npath = path + ".tmp"
rc = vol.rename(opath,npath)
if rc < 0:
return False, "rename error %d" % rc
ofd = vol.open(opath,os.O_RDWR)
if isinstance(ofd,File):
return False, "old path working after rename"
nfd = vol.open(npath,os.O_RDWR)
if isinstance(nfd,File):
return False, "new path not working after rename"
return True, "rename worked"
def test_unlink (vol, path, data):
mypath = path + ".tmp"
rc = vol.unlink(mypath)
if rc < 0:
return False, "unlink error %d" % fd
fd = vol.open(mypath,os.O_RDWR)
if isinstance(fd,File):
return False, "path still usable after unlink"
return True, "unlink worked"
def test_mkdir (vol, path, data):
mypath = path + ".dir"
rc = vol.mkdir(mypath)
if rc < 0:
return False, "mkdir error %d" % rc
return True, "mkdir worked"
def test_create_in_dir (vol, path, data):
mypath = path + ".dir/probe"
fd = vol.creat(mypath,os.O_RDWR,0644)
if not isinstance(fd,File):
return False, "create (in dir) error"
return True, "create (in dir) worked"
def test_dir_listing (vol, path, data):
mypath = path + ".dir"
fd = vol.opendir(mypath)
if not isinstance(fd,Dir):
return False, "opendir error %d" % fd
files = []
while True:
ent = fd.next()
if not isinstance(ent,Dirent):
break
name = ent.d_name[:ent.d_reclen]
files.append(name)
if files != [".", "..", "probe"]:
return False, "wrong directory contents"
return True, "directory listing worked"
def test_unlink_in_dir (vol, path, data):
mypath = path + ".dir/probe"
rc = vol.unlink(mypath)
if rc < 0:
return False, "unlink (in dir) error %d" % rc
return True, "unlink (in dir) worked"
def test_rmdir (vol, path, data):
mypath = path + ".dir"
rc = vol.rmdir(mypath)
if rc < 0:
return False, "rmdir error %d" % rc
sb = vol.lstat(mypath)
if not isinstance(sb,Stat):
return False, "dir still there after rmdir"
return True, "rmdir worked"
def test_setxattr (vol, path, data):
mypath = path + ".xa"
fd = vol.creat(mypath,os.O_RDWR|os.O_EXCL,0644)
if not fd:
return False, "creat (xattr test) error"
key1, key2 = "hello", "goodbye"
if vol.setxattr(mypath,"trusted.key1",key1,len(key1)) < 0:
return False, "setxattr (key1) error"
if vol.setxattr(mypath,"trusted.key2",key2,len(key2)) < 0:
return False, "setxattr (key2) error"
return True, "setxattr worked"
def test_getxattr (vol, path, data):
mypath = path + ".xa"
buf = vol.getxattr(mypath,"trusted.key1",32)
if type(buf) == types.IntType:
return False, "getxattr error"
if buf != "hello":
return False, "wrong getxattr value %s" % buf
return True, "getxattr worked"
def test_listxattr (vol, path, data):
mypath = path + ".xa"
xattrs = vol.listxattr(mypath)
if type(xattrs) == types.IntType:
return False, "listxattr error"
if xattrs != ["trusted.key1","trusted.key2"]:
return False, "wrong listxattr value %s" % repr(xattrs)
return True, "listxattr worked"
def test_fallocate (vol, path, data):
mypath = path + ".io"
fd = vol.creat(mypath,os.O_WRONLY|os.O_EXCL,0644)
if not fd:
return False, "creat error"
rc = fd.fallocate(0, 0, 1024*1024)
if rc != 0:
return False, "fallocate error"
rc = fd.discard(4096, 4096)
if rc != 0:
return False, "discard error"
return True, "fallocate/discard worked"
test_list = (
test_create_write,
test_open_read,
test_lstat,
test_rename,
test_unlink,
test_mkdir,
test_create_in_dir,
test_dir_listing,
test_unlink_in_dir,
test_rmdir,
test_setxattr,
test_getxattr,
test_listxattr,
test_fallocate,
)
ok_to_fail = (
# TBD: this fails opening the new file, even though the file
# did get renamed. Looks like a gfapi bug, not ours.
(test_rename, "new path not working after rename"),
# TBD: similar, call returns error even though it worked
(test_rmdir, "dir still there after rmdir"),
)
volid, path = sys.argv[1:3]
data = "fubar"
vol = Volume("localhost",volid)
vol.set_logging("/dev/null",7)
#vol.set_logging("/dev/stderr",7)
vol.mount()
failures = 0
expected = 0
for t in test_list:
rc, msg = t(vol,path,data)
if rc:
print "PASS: %s" % msg
else:
print "FAIL: %s" % msg
failures += 1
for otf in ok_to_fail:
if (t == otf[0]) and (msg == otf[1]):
print " (skipping known failure)"
expected += 1
break # from the *inner* for loop
else:
break # from the *outer* for loop
print "%d failures (%d expected)" % (failures, expected)
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