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# Copyright (C) 2018 Red Hat, Inc. <http://www.redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
""" Description: Module for gluster Block related helper functions. """
from glusto.core import Glusto as g
def block_create(mnode, volname, blockname, servers, size=None,
**block_args_info):
"""Create the gluster block with specified configuration
Args:
mnode(str): server on which command has to be executed
volname(str): volume name that has to be created
blockname(str): block name that has to be created
servers(list): List of servers IP's to be used to create block
size(str|None): Size of the block, none if storage link passed
block_args_info:
**block_args_info
The keys, values in block_args_info are:
- ha : (int)|None
- auth : (str)|None (enable|disable)
- prealloc : (str)|None (full|no)
- storage : (str)|None
- ring-buffer: (int)
Returns:
tuple: Tuple containing three elements (ret, out, err).
The first element 'ret' is of type 'int' and is the return value
of command execution.
The second element 'out' is of type 'str' and is the stdout value
of the command execution.
The third element 'err' is of type 'str' and is the stderr value
of the command execution.
(ret, out, err): As returned by block create command execution.
Example:
block_create(mnode, volname, blockname, servers, size,
**block_args_info)
"""
if not isinstance(servers, list):
servers = [servers]
ha = auth = prealloc = storage = ring_buffer = ''
if block_args_info.get('ha'):
ha = "ha %d" % int(block_args_info['ha'])
if block_args_info.get('auth'):
auth = "auth %s" % block_args_info['auth']
if block_args_info.get('prealloc'):
prealloc = "prealloc %s" % block_args_info['prealloc']
if block_args_info.get('ring-buffer'):
ring_buffer = "ring-buffer %d" % int(block_args_info['ring-buffer'])
if block_args_info.get('storage'):
storage = "storage %s" % block_args_info['storage']
size = ''
cmd = ("gluster-block create %s/%s %s %s %s %s %s %s %s " %
(volname, blockname, ha, auth, ring_buffer, storage,
prealloc, ','.join(servers), size))
return g.run(mnode, cmd)
def block_modify(mnode, volname, blockname, auth=None, size=None, force=False):
"""modify the block device by either enabling the auth or changing the
block size.
Args:
mnode (str): Node on which commands has to be executed
volname (str): Name of volume
blockname (str): Name of the block
auth (str): enable/disable
size (str): New block size
Returns:
tuple: Tuple containing three elements (ret, out, err).
The first element 'ret' is of type 'int' and is the return value
of command execution.
The second element 'out' is of type 'str' and is the stdout value
of the command execution.
The third element 'err' is of type 'str' and is the stderr value
of the command execution.
(ret, out, err): As returned by block create command execution.
"""
force_block_modify = ''
if force is True:
force_block_modify = "force"
if size is None:
cmd = ("gluster-block modify %s/%s auth %s %s --json-pretty" %
(volname, blockname, auth, force_block_modify))
else:
cmd = ("gluster-block modify %s/%s size %s %s --json-pretty " %
(volname, blockname, size, force_block_modify))
return g.run(mnode, cmd)
def block_list(mnode, volname):
"""list available block devices for the volume
Args:
mnode(str): server on which command has to be executed
volname(str): volume name for which blocks has to be listed
Returns:
tuple: Tuple containing three elements (ret, out, err).
The first element 'ret' is of type 'int' and is the return value
of command execution.
The second element 'out' is of type 'str' and is the stdout value
of the command execution.
The third element 'err' is of type 'str' and is the stderr value
of the command execution.
(ret, out, err): As returned by block create command execution.
"""
cmd = "gluster-block list %s --json-pretty" % volname
return g.run(mnode, cmd)
def block_info(mnode, volname, blockname):
"""Get info of block device
Args:
mnode(str): server on which command has to be executed
volname(str): volume name for which block info has got
blockname(str): block name for which info has to be got
Returns:
tuple: Tuple containing three elements (ret, out, err).
The first element 'ret' is of type 'int' and is the return value
of command execution.
The second element 'out' is of type 'str' and is the stdout value
of the command execution.
The third element 'err' is of type 'str' and is the stderr value
of the command execution.
(ret, out, err): As returned by block create command execution.
"""
cmd = "gluster-block info %s/%s --json-pretty" % (volname, blockname)
return g.run(mnode, cmd)
def block_delete(mnode, volname, blockname, unlink_storage="yes", force=False):
"""Delete the block from volname
Args:
mnode(str): server on which command has to be executed
volname(str): volume name from which block has to be delete
blockname(str): block name to be deleted
Returns:
tuple: Tuple containing three elements (ret, out, err).
The first element 'ret' is of type 'int' and is the return value
of command execution.
The second element 'out' is of type 'str' and is the stdout value
of the command execution.
The third element 'err' is of type 'str' and is the stderr value
of the command execution.
(ret, out, err): As returned by block create command execution.
"""
force_delete_block = ''
if force is True:
force_delete_block = "force"
if unlink_storage == "yes":
cmd = "gluster-block delete %s/%s %s" % (volname, blockname,
force_delete_block)
else:
cmd = ("gluster-block delete %s/%s unlink-storage no %s"
% (volname, blockname, force_delete_block))
return g.run(mnode, cmd)
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