def if_block_exists(mnode, volname, blockname):
"""Check if block already exists
Args:
mnode (str): Node on which commands has to be executed
volname (str): Name of the volume.
blockname(str): block name
Returns:
bool : True if block exists. False Otherwise
"""
# Get block list for the volname
ret, out, err = block_list(mnode, volname)
if ret != 0:
g.log.error("Failed to get block list for the volume %s: %s", volname,
err)
return False
# Check if block exists for the volname
block_list_dict = g.load_json_string(out)
if blockname in block_list_dict['blocks']:
return True
else:
g.log.error("Block '%s' doesn't exists on volume %s", blockname,
volname)
return False
def get_block_info(mnode, volname, blockname):
"""Get Block Info
Args:
mnode (str): Node on which commands has to be executed
volname (str): Name of the volume.
blockname(str): block name
Returns:
dict if successful in getting block info, None if block doesn't exists
"""
ret, out, err = block_info(mnode, volname, blockname)
if ret != 0:
g.log.error("Failed to get block info of block: %s/%s : %s", volname,
blockname, err)
return None
return g.load_json_string(out)
def get_block_list(mnode, volname):
""" Get list of all blocks for the volume
Args:
mnode (str): Node on which commands has to be executed
volname (str): Name of the volume.
Returns:
list of block names if successful in getting block list, None if
block list command errors
"""
# get block list for the volname
ret, out, err = block_list(mnode, volname)
if ret != 0:
g.log.error("Failed to get block list for the volume %s: %s", volname,
err)
return None
block_list_dict = g.load_json_string(out)
blocknames = block_list_dict.get('blocks', None)
if blocknames is None:
g.log.error("No blocks present on volume %s", volname)
return blocknames
