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# Copyright (C) 2008-2011 Dejan Muhamedagic <dmuhamedagic@suse.de>
# See COPYING for license information.
#
# Make sure that ids are unique.
import re
import copy
from . import constants
from . import xmlutil
from . import log
logger = log.setup_logger(__name__)
logger_utils = log.LoggerUtils(logger)
_id_store = {}
_state = []
ok = True # error var
def push_state():
_state.append(copy.deepcopy(_id_store))
def pop_state():
try:
global _id_store
_id_store = _state.pop()
return True
except IndexError:
return False
def drop_state():
try:
_state.pop()
except KeyError:
pass
def clean_state():
global _state
_state = []
def new(node, pfx):
'''
Create a unique id for the xml node.
'''
if re.search(r'^\d+$', pfx) and node.tag != "node":
pfx = "num-{}".format(pfx)
name = node.get("name")
if node.tag == "nvpair":
node_id = "%s-%s" % (pfx, name)
elif node.tag == "op":
interval = node.get("interval")
if interval:
node_id = "%s-%s-%s" % (pfx, name, interval)
else:
node_id = "%s-%s" % (pfx, name)
else:
subpfx = constants.subpfx_list.get(node.tag, '')
if subpfx:
node_id = "%s-%s" % (pfx, subpfx)
else:
node_id = pfx
if is_used(node_id):
node_id = _gen_free_id(node_id)
save(node_id)
return node_id
def _gen_free_id(node_id):
"generate a unique id"
# shouldn't really get here
for cnt in range(99):
try_id = "%s-%d" % (node_id, cnt)
if not is_used(try_id):
node_id = try_id
break
return node_id
def check_node(node, lvl):
global ok
node_id = node.get("id")
if not node_id:
return
if id_in_use(node_id):
logger.error("id_store: id %s is in use", node_id)
ok = False
return
def _store_node(node, lvl):
save(node.get("id"))
def _drop_node(node, lvl):
remove(node.get("id"))
def check_xml(node):
global ok
ok = True
xmlutil.xmltraverse_thin(node, check_node)
return ok
def store_xml(node):
if not check_xml(node):
return False
xmlutil.xmltraverse_thin(node, _store_node)
return True
def remove_xml(node):
xmlutil.xmltraverse_thin(node, _drop_node)
def replace_xml(oldnode, newnode):
remove_xml(oldnode)
if not store_xml(newnode):
store_xml(oldnode)
return False
return True
def is_used(node_id):
return node_id in _id_store
def id_in_use(obj_id):
if is_used(obj_id):
logger_utils.id_used_err(obj_id)
return True
return False
def save(node_id):
if not node_id:
return
_id_store[node_id] = 1
def rename(old_id, new_id):
if not old_id or not new_id:
return
if not is_used(old_id):
return
if is_used(new_id):
return
remove(old_id)
save(new_id)
def remove(node_id):
if not node_id:
return
try:
del _id_store[node_id]
except KeyError:
pass
def clear():
global _id_store
global _state
_id_store = {}
_state = []
def set_id(node, oldnode, id_hint, id_required=True):
'''
Set the id attribute for the node.
- if the node already contains "id", keep it
- if the old node contains "id", copy that
- if the node contains "uname", copy that
- else if required, create a new one using id_hint
- save the new id in idmgmt.
'''
old_id = oldnode.get("id") if oldnode is not None else None
new_id = node.get("id") or old_id or node.get("uname")
if new_id:
save(new_id)
elif id_required:
new_id = new(node, id_hint)
if new_id:
node.set("id", new_id)
if oldnode is not None and old_id == new_id:
xmlutil.set_id_used_attr(oldnode)
# vim:ts=4:sw=4:et:
|
