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#
# 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.
import collections
from heat.common import exception
from heat.engine.cfn import functions as cfn_funcs
from heat.engine import function
class GetParam(function.Function):
'''
A function for resolving parameter references.
Takes the form::
get_param: <param_name>
or::
get_param:
- <param_name>
- <path1>
- ...
'''
def __init__(self, stack, fn_name, args):
super(GetParam, self).__init__(stack, fn_name, args)
self.parameters = self.stack.parameters
def result(self):
args = function.resolve(self.args)
if not args:
raise ValueError(_('Function "%s" must have arguments') %
self.fn_name)
if isinstance(args, basestring):
param_name = args
path_components = []
elif isinstance(args, collections.Sequence):
param_name = args[0]
path_components = args[1:]
else:
raise TypeError(_('Argument to "%s" must be string or list') %
self.fn_name)
if not isinstance(param_name, basestring):
raise TypeError(_('Parameter name in "%s" must be string') %
self.fn_name)
try:
parameter = self.parameters[param_name]
except KeyError:
raise exception.UserParameterMissing(key=param_name)
def get_path_component(collection, key):
if not isinstance(collection, (collections.Mapping,
collections.Sequence)):
raise TypeError(_('"%s" can\'t traverse path') % self.fn_name)
if not isinstance(key, (basestring, int)):
raise TypeError(_('Path components in "%s" '
'must be strings') % self.fn_name)
return collection[key]
try:
return reduce(get_path_component, path_components, parameter)
except (KeyError, IndexError, TypeError):
return ''
class GetAtt(cfn_funcs.GetAtt):
'''
A function for resolving resource attributes.
Takes the form::
get_attr:
- <resource_name>
- <attribute_name>
- <path1>
- ...
'''
def _parse_args(self):
if (not isinstance(self.args, collections.Sequence) or
isinstance(self.args, basestring)):
raise TypeError(_('Argument to "%s" must be a list') %
self.fn_name)
if len(self.args) < 2:
raise ValueError(_('Arguments to "%s" must be of the form '
'[resource_name, attribute, (path), ...]') %
self.fn_name)
self._path_components = self.args[2:]
return tuple(self.args[:2])
def result(self):
attribute = super(GetAtt, self).result()
if attribute is None:
return None
path_components = function.resolve(self._path_components)
def get_path_component(collection, key):
if not isinstance(collection, (collections.Mapping,
collections.Sequence)):
raise TypeError(_('"%s" can\'t traverse path') % self.fn_name)
if not isinstance(key, (basestring, int)):
raise TypeError(_('Path components in "%s" '
'must be strings') % self.fn_name)
return collection[key]
try:
return reduce(get_path_component, path_components, attribute)
except (KeyError, IndexError, TypeError):
return None
class Replace(cfn_funcs.Replace):
'''
A function for performing string substitutions.
Takes the form::
str_replace:
template: <key_1> <key_2>
params:
<key_1>: <value_1>
<key_2>: <value_2>
...
And resolves to::
"<value_1> <value_2>"
This is implemented using Python's str.replace on each key. The order in
which replacements are performed is undefined.
'''
def _parse_args(self):
if not isinstance(self.args, collections.Mapping):
raise TypeError(_('Arguments to "%s" must be a map') %
self.fn_name)
try:
mapping = self.args['params']
string = self.args['template']
except (KeyError, TypeError):
example = ('''str_replace:
template: This is var1 template var2
params:
var1: a
var2: string''')
raise KeyError(_('"str_replace" syntax should be %s') %
example)
else:
return mapping, string
class GetFile(function.Function):
"""
A function for including a file inline.
Takes the form::
get_file: <file_key>
And resolves to the content stored in the files dictionary under the given
key.
"""
def result(self):
args = function.resolve(self.args)
if not (isinstance(args, basestring)):
raise TypeError(_('Argument to "%s" must be a string') %
self.fn_name)
f = self.stack.t.files.get(args)
if f is None:
fmt_data = {'fn_name': self.fn_name,
'file_key': args}
raise ValueError(_('No content found in the "files" section for '
'%(fn_name)s path: %(file_key)s') % fmt_data)
return f
def function_mapping(version_key, version):
if version_key != 'heat_template_version':
return {}
if version == '2013-05-23':
return {
'Fn::GetAZs': cfn_funcs.GetAZs,
'get_param': GetParam,
'get_resource': cfn_funcs.ResourceRef,
'Ref': cfn_funcs.Ref,
'get_attr': GetAtt,
'Fn::Select': cfn_funcs.Select,
'Fn::Join': cfn_funcs.Join,
'Fn::Split': cfn_funcs.Split,
'str_replace': Replace,
'Fn::Replace': cfn_funcs.Replace,
'Fn::Base64': cfn_funcs.Base64,
'Fn::MemberListToMap': cfn_funcs.MemberListToMap,
'Fn::ResourceFacade': cfn_funcs.ResourceFacade,
'get_file': GetFile,
}
return {}
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