def listdir(self, path):
""" return directory contents, excluding . and .. """
entries = []
dirp = ctypes.c_void_p()
ret = self.conn.libcephfs.ceph_opendir(self.conn.cluster,
str(path),
ctypes.byref(dirp))
if ret < 0:
if ret == -errno.ENOENT:
raise NotFound
raise cephfs.make_ex(ret, "error in opendir: %s" % path)
buf = ctypes.create_string_buffer(1024)
ret = self.conn.libcephfs.ceph_getdnames(self.conn.cluster,
dirp,
buf,
ctypes.c_int(1024))
if ret < 0:
raise cephfs.make_ex(ret, "error in getdnames: %s" % path)
start = 0
offset = 0
while offset < ret:
if buf[offset] == '\0' or offset == ret:
fname = buf[start:offset]
if fname != '.' and fname != '..':
entries.append(fname)
start = offset + 1
offset += 1
ret = self.conn.libcephfs.ceph_closedir(self.conn.cluster, dirp)
if ret < 0:
raise cephfs.make_ex(ret, "error in closedir: %s" % path)
return entries
def read(self, limit=-1):
""" Read at most 'limit' bytes. If zero or negative, read until EOF. """
if self.fdesc is None:
return ''
retbuf = ''
if limit and limit > 0:
readbuf = ctypes.create_string_buffer(limit)
else:
readbuf = ctypes.create_string_buffer(128*1024)
while True:
readlen = 128*1024
if limit and limit > 0:
if len(retbuf) >= limit:
return retbuf
else:
if limit - len(readbuf) < readlen:
readlen = limit - len(retbuf)
ret = self.conn.libcephfs.ceph_read(self.conn.cluster, self.fdesc, readbuf, ctypes.c_longlong(readlen), ctypes.c_longlong(-1))
if ret == 0:
return retbuf
elif ret > 0:
retbuf += readbuf[0:ret]
else:
raise cephfs.make_ex(ret, "error in read")
return retbuf
def rmdir(self, path):
""" delete directory """
ret = self.conn.libcephfs.ceph_rmdir(self.conn.cluster, str(path))
if ret < 0:
if ret == -errno.ENOENT:
raise NotFound
raise cephfs.make_ex(ret, "error in rmdir: %s" % path)
def seek(self, offset, whence=0):
""" seek """
if self.fdesc is None:
return
ret = self.conn.libcephfs.ceph_lseek(self.conn.cluster, self.fdesc, ctypes.c_longlong(offset), ctypes.c_int(whence))
if ret < 0:
raise cephfs.make_ex(ret, "error in seek")
def write(self, data):
""" write data """
if self.fdesc is None:
return
offset = 0
total = len(data)
while offset < total:
datalen = len(data) - offset
if datalen > 128*1024:
datalen = 128*1024
ret = self.conn.libcephfs.ceph_write(self.conn.cluster, self.fdesc, ctypes.c_char_p(data[offset:offset+datalen]), ctypes.c_longlong(datalen), ctypes.c_longlong(-1))
if ret >= 0:
offset += ret
else:
raise cephfs.make_ex(ret, "error in write")