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# Copyright (C) 2009 Yan Gao <ygao@novell.com>
# See COPYING for license information.
import os
import tempfile
import copy
from lxml import etree
class PacemakerError(Exception):
'''PacemakerError exceptions'''
def get_validate_name(cib_elem):
if cib_elem is not None:
return cib_elem.get("validate-with")
else:
return None
def get_validate_type(cib_elem):
return "rng"
def get_schema_filename(validate_name):
if not validate_name.endswith('.rng'):
return "%s.rng" % (validate_name)
return validate_name
def read_schema_local(validate_name, file_path):
try:
with open(file_path) as f:
return f.read()
except IOError as msg:
raise PacemakerError("Cannot read schema file '%s': %s" % (file_path, msg))
def delete_dir(dir_path):
real_path = os.path.realpath(dir_path)
if real_path.count(os.sep) == len(real_path):
raise PacemakerError("Do not delete the root directory")
for root, dirs, files in os.walk(dir_path, False):
for name in files:
try:
os.unlink(os.path.join(root, name))
except OSError:
continue
for name in dirs:
try:
os.rmdir(os.path.join(root, name))
except OSError:
continue
os.rmdir(dir_path)
def subset_select(sub_set, optional):
"Helper used to select attributes/elements based on subset and optional flag"
if sub_set == 'r': # required
return not optional
if sub_set == 'o': # optional
return optional
return True
def CrmSchema(cib_elem, local_dir):
return RngSchema(cib_elem, local_dir)
class Schema(object):
validate_name = None
def __init__(self, cib_elem, local_dir, is_local=True, get_schema_fn=None):
self.is_local = is_local
if get_schema_fn is not None:
self.get_schema_fn = get_schema_fn
else:
self.get_schema_fn = read_schema_local
self.local_dir = local_dir
self.refresh(cib_elem)
self.schema_str_docs = {}
self.schema_filename = None
def update_schema(self):
'defined in subclasses'
raise NotImplementedError
def find_elem(self, elem_name):
'defined in subclasses'
raise NotImplementedError
def refresh(self, cib_elem):
saved_validate_name = self.validate_name
self.validate_name = get_validate_name(cib_elem)
self.schema_filename = get_schema_filename(self.validate_name)
if self.validate_name != saved_validate_name:
return self.update_schema()
def validate_cib(self, new_cib_elem):
detail_msg = ""
if self.is_local:
schema_f = os.path.join(self.local_dir, self.schema_filename)
else:
try:
tmp_f = self.tmp_schema_f()
except EnvironmentError as msg:
raise PacemakerError("Cannot expand the Relax-NG schema: " + str(msg))
if tmp_f is None:
raise PacemakerError("Cannot expand the Relax-NG schema")
else:
schema_f = tmp_f
try:
cib_elem = etree.fromstring(etree.tostring(new_cib_elem))
except etree.Error as msg:
raise PacemakerError("Failed to parse the CIB XML: " + str(msg))
try:
schema = etree.RelaxNG(file=schema_f)
except etree.Error as msg:
raise PacemakerError("Failed to parse the Relax-NG schema: " + str(msg))
try:
etree.clear_error_log()
except:
pass
is_valid = schema.validate(cib_elem)
if not is_valid:
for error_entry in schema.error_log:
detail_msg += error_entry.level_name + ": " + error_entry.message + "\n"
if not self.is_local:
try:
delete_dir(os.path.dirname(tmp_f))
except:
pass
return (is_valid, detail_msg)
def tmp_schema_f(self):
tmp_dir = tempfile.mkdtemp()
for schema_doc_name in self.schema_str_docs:
schema_doc_filename = os.path.join(tmp_dir, schema_doc_name)
fd = os.open(schema_doc_filename, os.O_RDWR | os.O_CREAT | os.O_TRUNC, 0o644)
schema_doc_str = self.schema_str_docs[schema_doc_name]
os.write(fd, schema_doc_str)
os.close(fd)
if self.schema_filename in self.schema_str_docs:
return os.path.join(tmp_dir, self.schema_filename)
else:
return None
def get_sub_elems_by_obj(self, obj, sub_set='a'):
'''defined in subclasses'''
raise NotImplementedError
def get_elem_attrs_by_obj(self, obj, sub_set='a'):
'''defined in subclasses'''
raise NotImplementedError
# sub_set: 'a'(all), 'r'(required), 'o'(optional)
def get_elem_attrs(self, elem_name, sub_set='a'):
elem_obj = self.find_elem(elem_name)
if elem_obj is None:
return None
return self.get_elem_attrs_by_obj(elem_obj, sub_set)
# sub_set: 'a'(all), 'r'(required), 'o'(optional)
def get_sub_elems(self, elem_name, sub_set='a'):
elem_obj = self.find_elem(elem_name)
if elem_obj is None:
return None
return self.get_sub_elems_by_obj(elem_obj, sub_set)
def supported_rsc_types(self):
return self.get_sub_elems("resources")
def get_local_tag(el):
return el.tag.replace("{%s}" % el.nsmap[None], "")
class RngSchema(Schema):
expr = '//*[local-name() = $name]'
def __init__(self, cib_elem, local_dir, is_local=True, get_schema_fn=None):
self.rng_docs = {}
Schema.__init__(self, cib_elem, local_dir, is_local=is_local, get_schema_fn=get_schema_fn)
def update_schema(self):
self.rng_docs = {}
self.schema_str_docs = {}
self.update_rng_docs(self.validate_name, self.schema_filename)
return True
def update_rng_docs(self, validate_name, filename):
self.rng_docs[filename] = self.find_start_rng_node(validate_name, filename)
if self.rng_docs[filename] is None:
return
for extern_ref in self.rng_docs[filename][0].xpath(self.expr, name="externalRef"):
href_value = extern_ref.get("href")
if self.rng_docs.get(href_value) is None:
self.update_rng_docs(validate_name, href_value)
def find_start_rng_node(self, validate_name, filename):
schema_info = validate_name + " " + filename
crm_schema = self.get_schema_fn(validate_name,
os.path.join(self.local_dir, filename))
if not crm_schema:
raise PacemakerError("Cannot get the Relax-NG schema: " + schema_info)
self.schema_str_docs[filename] = crm_schema
try:
grammar = etree.fromstring(crm_schema.encode('utf-8'))
except Exception as msg:
raise PacemakerError("Failed to parse the Relax-NG schema: " + str(msg) + schema_info)
start_nodes = grammar.xpath(self.expr, name="start")
if len(start_nodes) > 0:
start_node = start_nodes[0]
return (grammar, start_node)
else:
raise PacemakerError("Cannot find the start in the Relax-NG schema: " + schema_info)
def find_in_grammar(self, grammar, node, name):
for elem_node in grammar.xpath(self.expr, name=node):
if elem_node.get("name") == name:
return elem_node
return None
def find_elem(self, elem_name):
elem_node = None
for (grammar, start_node) in list(self.rng_docs.values()):
elem_node = self.find_in_grammar(grammar, 'element', elem_name)
if elem_node is not None:
return (grammar, elem_node)
return None
def rng_xpath(self, xpath, namespaces=None):
return [grammar.xpath(xpath, namespaces=namespaces)
for grammar, _ in list(self.rng_docs.values())]
def get_sub_rng_nodes(self, grammar, rng_node):
sub_rng_nodes = []
for child_node in rng_node.iterchildren():
if not isinstance(child_node.tag, str):
continue
local_tag = get_local_tag(child_node)
if local_tag == "ref":
def_node = self.find_in_grammar(grammar, 'define', child_node.get('name'))
if def_node is not None:
sub_rng_nodes.extend(self.get_sub_rng_nodes(grammar, def_node))
elif local_tag == "externalRef":
nodes = self.get_sub_rng_nodes(*self.rng_docs[child_node.get("href")])
sub_rng_nodes.extend(nodes)
elif local_tag in ["element", "attribute", "value", "data", "text"]:
sub_rng_nodes.append([(grammar, child_node)])
elif local_tag in ["interleave", "optional", "zeroOrMore",
"choice", "group", "oneOrMore"]:
nodes = self.get_sub_rng_nodes(grammar, child_node)
for node in nodes:
node.append(copy.deepcopy(child_node))
sub_rng_nodes.extend(nodes)
return sub_rng_nodes
def sorted_sub_rng_nodes_by_name(self, obj_type):
rng_node = self.find_elem(obj_type)
if rng_node is None or rng_node[1] is None:
return None
return self.sorted_sub_rng_nodes_by_node(*rng_node)
def sorted_sub_rng_nodes_by_node(self, grammar, rng_node):
sub_rng_nodes = self.get_sub_rng_nodes(grammar, rng_node)
sorted_nodes = {}
for sub_rng_node in sub_rng_nodes:
name = get_local_tag(sub_rng_node[0][1])
if sorted_nodes.get(name) is None:
sorted_nodes[name] = []
sorted_nodes[name].append(sub_rng_node)
return sorted_nodes
def get_elem_attr_objs(self, obj_type):
return self.sorted_sub_rng_nodes_by_name(obj_type).get("attribute", [])
def get_sub_elem_objs(self, obj_type):
return self.sorted_sub_rng_nodes_by_name(obj_type).get("element", [])
def find_decl(self, rng_node, name, first=True):
decl_node_index = 0
for decl_node in rng_node[1:]:
if get_local_tag(decl_node) == name:
decl_node_index = rng_node.index(decl_node) - len(rng_node)
if first:
break
return decl_node_index
def get_sorted_decl_nodes(self, decl_nodes_list, decl_type):
sorted_nodes = []
for rng_nodes in decl_nodes_list:
rng_node = rng_nodes.get(decl_type)
if rng_node is not None and rng_node not in sorted_nodes:
sorted_nodes.append(rng_node)
return sorted_nodes
def get_obj_name(self, rng_node):
return rng_node[0][1].get("name")
def get_attr_type(self, attr_rng_node):
sub_rng_nodes = self.sorted_sub_rng_nodes_by_node(*attr_rng_node[0])
for sub_rng_node in sub_rng_nodes.get("data", []):
return sub_rng_nodes["data"][0][0][1].get("type")
return None
def get_attr_values(self, attr_rng_node):
attr_values = []
sub_rng_nodes = self.sorted_sub_rng_nodes_by_node(*attr_rng_node[0])
for sub_rng_node in sub_rng_nodes.get("value", []):
attr_values.append(sub_rng_node[0][1].text)
return attr_values
def get_attr_default(self, attr_rng_node):
return attr_rng_node[0][1].get("ann:defaultValue")
def _get_by_obj(self, rng_obj, typ, sub_set):
"""
Used to select attributes or elements based on
sub_set selector and optionality.
typ: 'attribute' or 'element'
sub_set: 'a'(all), 'r'(required), 'o'(optional)
"""
grammar, rng_node = rng_obj
if rng_node is None:
return None
selected = []
sub_rng_nodes = self.get_sub_rng_nodes(grammar, rng_node)
for node in sub_rng_nodes:
head = node[0][1]
if get_local_tag(head) != typ:
continue
name = head.get("name")
if selected.count(name):
continue
# the complicated case: 'choice'
optional = any(self.find_decl(node, opt) != 0
for opt in ("optional", "zeroOrMore"))
if subset_select(sub_set, optional):
selected.append(name)
return selected
def get_elem_attrs_by_obj(self, rng_obj, sub_set='a'):
"sub_set: 'a'(all), 'r'(required), 'o'(optional)"
return self._get_by_obj(rng_obj, 'attribute', sub_set=sub_set)
def get_sub_elems_by_obj(self, rng_obj, sub_set='a'):
"sub_set: 'a'(all), 'r'(required), 'o'(optional)"
return self._get_by_obj(rng_obj, 'element', sub_set=sub_set)
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