root / ncclient / xml_.py @ bfcf8aea
History | View | Annotate | Download (3.7 kB)
1 |
# Copyright 2009 Shikhar Bhushan
|
---|---|
2 |
#
|
3 |
# Licensed under the Apache License, Version 2.0 (the "License");
|
4 |
# you may not use this file except in compliance with the License.
|
5 |
# You may obtain a copy of the License at
|
6 |
#
|
7 |
# http://www.apache.org/licenses/LICENSE-2.0
|
8 |
#
|
9 |
# Unless required by applicable law or agreed to in writing, software
|
10 |
# distributed under the License is distributed on an "AS IS" BASIS,
|
11 |
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
12 |
# See the License for the specific language governing permissions and
|
13 |
# limitations under the License.
|
14 |
|
15 |
|
16 |
"Methods for creating, parsing, and dealing with XML and ElementTree objects."
|
17 |
|
18 |
from cStringIO import StringIO |
19 |
from xml.etree import cElementTree as ET |
20 |
|
21 |
from ncclient import NCClientError |
22 |
|
23 |
class XMLError(NCClientError): pass |
24 |
|
25 |
### Namespace-related
|
26 |
|
27 |
#: Base NETCONF namespace
|
28 |
BASE_NS_1_0 = 'urn:ietf:params:xml:ns:netconf:base:1.0'
|
29 |
#: Namespace for Tail-f core data model
|
30 |
TAILF_AAA_1_1 = 'http://tail-f.com/ns/aaa/1.1'
|
31 |
#: Namespace for Tail-f execd data model
|
32 |
TAILF_EXECD_1_1 = 'http://tail-f.com/ns/execd/1.1'
|
33 |
#: Namespace for Cisco data model
|
34 |
CISCO_CPI_1_0 = 'http://www.cisco.com/cpi_10/schema'
|
35 |
#: Namespace for Flowmon data model
|
36 |
FLOWMON_1_0 = 'http://www.liberouter.org/ns/netopeer/flowmon/1.0'
|
37 |
|
38 |
try:
|
39 |
register_namespace = ET.register_namespace |
40 |
except AttributeError: |
41 |
def register_namespace(prefix, uri): |
42 |
from xml.etree import ElementTree |
43 |
# cElementTree uses ElementTree's _namespace_map, so that's ok
|
44 |
ElementTree._namespace_map[uri] = prefix |
45 |
|
46 |
prefix_map = { |
47 |
BASE_NS_1_0: 'nc',
|
48 |
TAILF_AAA_1_1: 'aaa',
|
49 |
TAILF_EXECD_1_1: 'execd',
|
50 |
CISCO_CPI_1_0: 'cpi',
|
51 |
FLOWMON_1_0: 'fm',
|
52 |
} |
53 |
|
54 |
for (ns, pre) in prefix_map.items(): |
55 |
register_namespace(pre, ns) |
56 |
|
57 |
qualify = lambda tag, ns=BASE_NS_1_0: tag if ns is None else '{%s}%s' % (ns, tag) |
58 |
|
59 |
#unqualify = lambda tag: tag[tag.rfind('}')+1:]
|
60 |
|
61 |
def to_xml(ele, encoding="UTF-8"): |
62 |
"""Convert an :class:`~xml.etree.ElementTree.Element` to XML.
|
63 |
|
64 |
:arg ele: the :class:`~xml.etree.ElementTree.Element`
|
65 |
:arg encoding: character encoding
|
66 |
:rtype: :obj:`string`
|
67 |
"""
|
68 |
xml = ET.tostring(ele, encoding) |
69 |
return xml if xml.startswith('<?xml') else '<?xml version="1.0" encoding="%s"?>%s' % (encoding, xml) |
70 |
|
71 |
def to_ele(x): |
72 |
"""Convert XML to :class:`~xml.etree.ElementTree.Element`.
|
73 |
|
74 |
:type xml: :obj:`string`
|
75 |
:rtype: :class:`~xml.etree.ElementTree.Element`
|
76 |
"""
|
77 |
return x if iselement(x) else ET.fromstring(x) |
78 |
|
79 |
iselement = ET.iselement |
80 |
|
81 |
def parse_root(raw): |
82 |
"""Efficiently parses the root element of an XML document.
|
83 |
|
84 |
:arg raw: XML document
|
85 |
:returns: a tuple of `(tag, attrib)`, where *tag* is the (qualified)
|
86 |
name of the element and *attrib* is a dictionary of its attributes.
|
87 |
:rtype: `tuple`
|
88 |
"""
|
89 |
fp = StringIO(raw) |
90 |
for event, element in ET.iterparse(fp, events=('start',)): |
91 |
return (element.tag, element.attrib)
|
92 |
|
93 |
def validated_element(x, tags=None, attrs=None): |
94 |
"Checks if the root element of an XML document or Element meets the supplied criteria."
|
95 |
ele = to_ele(x) |
96 |
if tags:
|
97 |
if isinstance(tags, basestring): |
98 |
tags = [tags] |
99 |
if ele.tag not in tags: |
100 |
raise XMLError("Element [%s] does not meet requirement" % ele.tag) |
101 |
if attrs:
|
102 |
for req in attrs: |
103 |
if isinstance(req, basestring): req = [req] |
104 |
for alt in req: |
105 |
if alt in ele.attrib: |
106 |
break
|
107 |
else:
|
108 |
raise XMLError("Element [%s] does not have required attributes" % ele.tag) |
109 |
return ele
|
110 |
|
111 |
|
112 |
new_ele = lambda tag, attrs={}, **extra: ET.Element(tag, attrs, **extra)
|
113 |
|
114 |
sub_ele = lambda parent, tag, attrs={}, **extra: ET.SubElement(parent, tag, attrs, **extra)
|