405ff049ff
This reverts commit 1d7647fa85.
This change altered the xml output (by forcing it to fail) which a
backward compatible change should not do. Revert it in order to get this
compat change in without breaking that output and test.
Change-Id: I20f66fb1bd9c70a0debbdd5eebacf6ec5d0f5df9
208 lines
7.6 KiB
Python
208 lines
7.6 KiB
Python
#!/usr/bin/env python
|
|
# Copyright (C) 2013 Hewlett-Packard.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
# Provides local yaml parsing classes and extend yaml module
|
|
|
|
"""Custom application specific yamls tags are supported to provide
|
|
enhancements when reading yaml configuration.
|
|
|
|
These allow inclusion of arbitrary files as a method of having blocks of data
|
|
managed separately to the yaml job configurations. A specific usage of this is
|
|
inlining scripts contained in separate files, although such tags may also be
|
|
used to simplify usage of macros or job templates.
|
|
|
|
The tag ``!include`` will treat the following string as file which should be
|
|
parsed as yaml configuration data.
|
|
|
|
Example:
|
|
|
|
.. literalinclude:: /../../tests/localyaml/fixtures/include001.yaml
|
|
|
|
|
|
The tag ``!include-raw`` will treat the following file as a data blob, which
|
|
should be read into the calling yaml construct without any further parsing.
|
|
Any data in a file included through this tag, will be treated as string data.
|
|
|
|
Example:
|
|
|
|
.. literalinclude:: /../../tests/localyaml/fixtures/include-raw001.yaml
|
|
|
|
|
|
The tag ``!include-raw-escape`` treats the given file as a data blob, which
|
|
should be escaped before being read in as string data. This allows
|
|
job-templates to use this tag to include scripts from files without
|
|
needing to escape braces in the original file.
|
|
|
|
|
|
Example:
|
|
|
|
.. literalinclude::
|
|
/../../tests/localyaml/fixtures/include-raw-escaped001.yaml
|
|
|
|
"""
|
|
|
|
import codecs
|
|
try:
|
|
from collections import OrderedDict
|
|
except ImportError:
|
|
from ordereddict import OrderedDict
|
|
import functools
|
|
import logging
|
|
import re
|
|
import os
|
|
import yaml
|
|
from yaml.constructor import BaseConstructor
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class OrderedConstructor(BaseConstructor):
|
|
"""The default constructor class for PyYAML loading uses standard python
|
|
dictionaries which can have randomized ordering enabled (default in
|
|
CPython from version 3.3). The order of the XML elements being outputted
|
|
is both important for tests and for ensuring predictable generation based
|
|
on the source. This subclass overrides this behaviour to ensure that all
|
|
dict's created make use of OrderedDict to have iteration of keys to always
|
|
follow the order in which the keys were inserted/created.
|
|
"""
|
|
|
|
def construct_yaml_map(self, node):
|
|
data = OrderedDict()
|
|
yield data
|
|
value = self.construct_mapping(node)
|
|
|
|
if isinstance(node, yaml.MappingNode):
|
|
self.flatten_mapping(node)
|
|
else:
|
|
raise yaml.constructor.ConstructorError(
|
|
None, None,
|
|
'expected a mapping node, but found %s' % node.id,
|
|
node.start_mark)
|
|
|
|
mapping = OrderedDict()
|
|
for key_node, value_node in node.value:
|
|
key = self.construct_object(key_node, deep=False)
|
|
try:
|
|
hash(key)
|
|
except TypeError as exc:
|
|
raise yaml.constructor.ConstructorError(
|
|
'while constructing a mapping', node.start_mark,
|
|
'found unacceptable key (%s)' % exc, key_node.start_mark)
|
|
value = self.construct_object(value_node, deep=False)
|
|
mapping[key] = value
|
|
data.update(mapping)
|
|
|
|
|
|
class LocalLoader(OrderedConstructor, yaml.Loader):
|
|
"""Subclass for yaml.Loader which handles the local tags 'include',
|
|
'include-raw' and 'include-raw-escaped' to specify a file to include data
|
|
from and whether to parse it as additional yaml, treat it as a data blob
|
|
or additionally escape the data contained. These are specified in yaml
|
|
files by "!include path/to/file.yaml".
|
|
|
|
Constructor access a list of search paths to look under for the given
|
|
file following each tag, taking the first match found. Search path by
|
|
default will include the same directory as the yaml file and the current
|
|
working directory.
|
|
|
|
|
|
Loading::
|
|
|
|
# use the load function provided in this module
|
|
import local_yaml
|
|
data = local_yaml.load(open(fn))
|
|
|
|
|
|
# Loading by providing the alternate class to the default yaml load
|
|
from local_yaml import LocalLoader
|
|
data = yaml.load(open(fn), LocalLoader)
|
|
|
|
# Loading with a search path
|
|
from local_yaml import LocalLoader
|
|
import functools
|
|
data = yaml.load(open(fn), functools.partial(LocalLoader,
|
|
search_path=['path']))
|
|
|
|
"""
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
# make sure to pop off any local settings before passing to
|
|
# the parent constructor as any unknown args may cause errors.
|
|
self.search_path = set()
|
|
if 'search_path' in kwargs:
|
|
for p in kwargs.pop('search_path'):
|
|
logger.debug("Adding '{0}' to search path for include tags"
|
|
.format(p))
|
|
self.search_path.add(os.path.normpath(p))
|
|
|
|
if 'escape_callback' in kwargs:
|
|
self._escape = kwargs.pop('escape_callback')
|
|
|
|
super(LocalLoader, self).__init__(*args, **kwargs)
|
|
|
|
# Add tag constructors
|
|
self.add_constructor('!include', self._include_tag)
|
|
self.add_constructor('!include-raw', self._include_raw_tag)
|
|
self.add_constructor('!include-raw-escape',
|
|
self._include_raw_escape_tag)
|
|
|
|
# constructor to preserve order of maps and ensure that the order of
|
|
# keys returned is consistent across multiple python versions
|
|
self.add_constructor(yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG,
|
|
type(self).construct_yaml_map)
|
|
|
|
if isinstance(self.stream, file):
|
|
self.search_path.add(os.path.normpath(
|
|
os.path.dirname(self.stream.name)))
|
|
self.search_path.add(os.path.normpath(os.path.curdir))
|
|
|
|
def _find_file(self, filename):
|
|
for dirname in self.search_path:
|
|
candidate = os.path.expanduser(os.path.join(dirname, filename))
|
|
if os.path.isfile(candidate):
|
|
logger.info("Including file '{0}' from path '{0}'"
|
|
.format(filename, dirname))
|
|
return candidate
|
|
return filename
|
|
|
|
def _include_tag(self, loader, node):
|
|
filename = self._find_file(loader.construct_yaml_str(node))
|
|
with open(filename, 'r') as f:
|
|
data = yaml.load(f, functools.partial(LocalLoader,
|
|
search_path=self.search_path
|
|
))
|
|
return data
|
|
|
|
def _include_raw_tag(self, loader, node):
|
|
filename = self._find_file(loader.construct_yaml_str(node))
|
|
try:
|
|
with codecs.open(filename, 'r', 'utf-8') as f:
|
|
data = f.read()
|
|
except:
|
|
logger.error("Failed to include file using search path: '{0}'"
|
|
.format(':'.join(self.search_path)))
|
|
raise
|
|
return data
|
|
|
|
def _include_raw_escape_tag(self, loader, node):
|
|
return self._escape(self._include_raw_tag(loader, node))
|
|
|
|
def _escape(self, data):
|
|
return re.sub(r'({|})', r'\1\1', data)
|
|
|
|
|
|
def load(stream, **kwargs):
|
|
return yaml.load(stream, functools.partial(LocalLoader, **kwargs))
|