435 lines
15 KiB
Python
435 lines
15 KiB
Python
|
|
#
|
|
# 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
|
|
import itertools
|
|
import json
|
|
from heat.engine import constraints as constr
|
|
|
|
from heat.common import exception
|
|
|
|
|
|
PARAMETER_KEYS = (
|
|
TYPE, DEFAULT, NO_ECHO, ALLOWED_VALUES, ALLOWED_PATTERN,
|
|
MAX_LENGTH, MIN_LENGTH, MAX_VALUE, MIN_VALUE,
|
|
DESCRIPTION, CONSTRAINT_DESCRIPTION, LABEL
|
|
) = (
|
|
'Type', 'Default', 'NoEcho', 'AllowedValues', 'AllowedPattern',
|
|
'MaxLength', 'MinLength', 'MaxValue', 'MinValue',
|
|
'Description', 'ConstraintDescription', 'Label'
|
|
)
|
|
|
|
|
|
class Schema(constr.Schema):
|
|
'''Parameter schema.'''
|
|
|
|
KEYS = (
|
|
TYPE, DESCRIPTION, DEFAULT, SCHEMA, CONSTRAINTS, HIDDEN, LABEL
|
|
) = (
|
|
'Type', 'Description', 'Default', 'Schema', 'Constraints', 'NoEcho',
|
|
'Label'
|
|
)
|
|
|
|
# For Parameters the type name for Schema.LIST is CommaDelimitedList
|
|
# and the type name for Schema.MAP is Json
|
|
TYPES = (
|
|
STRING, NUMBER, LIST, MAP,
|
|
) = (
|
|
'String', 'Number', 'CommaDelimitedList', 'Json',
|
|
)
|
|
|
|
def __init__(self, data_type, description=None, default=None, schema=None,
|
|
constraints=[], hidden=False, context=None):
|
|
super(Schema, self).__init__(data_type=data_type,
|
|
description=description,
|
|
default=default,
|
|
schema=schema,
|
|
required=default is None,
|
|
constraints=constraints)
|
|
self.hidden = hidden
|
|
self.context = context
|
|
|
|
# Schema class validates default value for lists assuming list type. For
|
|
# comma delimited list string supported in paramaters Schema class, the
|
|
# default value has to be parsed into a list if necessary so that
|
|
# validation works.
|
|
def _validate_default(self):
|
|
if self.default is not None:
|
|
default_value = self.default
|
|
if self.type == self.LIST and not isinstance(self.default, list):
|
|
try:
|
|
default_value = self.default.split(',')
|
|
except (KeyError, AttributeError) as err:
|
|
raise constr.InvalidSchemaError(_('Default must be a '
|
|
'comma-delimited list '
|
|
'string: %s') % str(err))
|
|
try:
|
|
self.validate_constraints(default_value)
|
|
except (ValueError, TypeError) as exc:
|
|
raise constr.InvalidSchemaError(_('Invalid default '
|
|
'%(default)s (%(exc)s)') %
|
|
dict(default=self.default,
|
|
exc=exc))
|
|
|
|
def set_default(self, default=None):
|
|
super(Schema, self).set_default(default)
|
|
self.required = default is None
|
|
|
|
@staticmethod
|
|
def get_num(key, context):
|
|
val = context.get(key)
|
|
if val is not None:
|
|
val = Schema.str_to_num(val)
|
|
return val
|
|
|
|
@classmethod
|
|
def from_dict(cls, schema_dict):
|
|
"""
|
|
Return a Parameter Schema object from a legacy schema dictionary.
|
|
"""
|
|
|
|
def constraints():
|
|
desc = schema_dict.get(CONSTRAINT_DESCRIPTION)
|
|
|
|
if MIN_VALUE in schema_dict or MAX_VALUE in schema_dict:
|
|
yield constr.Range(Schema.get_num(MIN_VALUE, schema_dict),
|
|
Schema.get_num(MAX_VALUE, schema_dict),
|
|
desc)
|
|
if MIN_LENGTH in schema_dict or MAX_LENGTH in schema_dict:
|
|
yield constr.Length(Schema.get_num(MIN_LENGTH, schema_dict),
|
|
Schema.get_num(MAX_LENGTH, schema_dict),
|
|
desc)
|
|
if ALLOWED_VALUES in schema_dict:
|
|
yield constr.AllowedValues(schema_dict[ALLOWED_VALUES], desc)
|
|
if ALLOWED_PATTERN in schema_dict:
|
|
yield constr.AllowedPattern(schema_dict[ALLOWED_PATTERN], desc)
|
|
|
|
# make update_allowed true by default on TemplateResources
|
|
# as the template should deal with this.
|
|
return cls(schema_dict[TYPE],
|
|
description=schema_dict.get(DESCRIPTION),
|
|
default=schema_dict.get(DEFAULT),
|
|
constraints=list(constraints()),
|
|
hidden=str(schema_dict.get(NO_ECHO,
|
|
'false')).lower() == 'true')
|
|
|
|
def validate(self, name, value):
|
|
super(Schema, self).validate_constraints(value, self.context)
|
|
|
|
def __getitem__(self, key):
|
|
if key == self.TYPE:
|
|
return self.type
|
|
if key == self.HIDDEN:
|
|
return self.hidden
|
|
else:
|
|
return super(Schema, self).__getitem__(key)
|
|
|
|
raise KeyError(key)
|
|
|
|
|
|
class Parameter(object):
|
|
'''A template parameter.'''
|
|
|
|
def __new__(cls, name, schema, value=None, validate_value=True):
|
|
'''Create a new Parameter of the appropriate type.'''
|
|
if cls is not Parameter:
|
|
return super(Parameter, cls).__new__(cls)
|
|
|
|
# Check for fully-fledged Schema objects
|
|
if not isinstance(schema, Schema):
|
|
schema = Schema.from_dict(schema)
|
|
|
|
if schema.type == schema.STRING:
|
|
ParamClass = StringParam
|
|
elif schema.type == schema.NUMBER:
|
|
ParamClass = NumberParam
|
|
elif schema.type == schema.LIST:
|
|
ParamClass = CommaDelimitedListParam
|
|
elif schema.type == schema.MAP:
|
|
ParamClass = JsonParam
|
|
else:
|
|
raise ValueError(_('Invalid Parameter type "%s"') % schema.type)
|
|
|
|
return ParamClass(name, schema, value, validate_value)
|
|
|
|
def __init__(self, name, schema, value=None, validate_value=True):
|
|
'''
|
|
Initialise the Parameter with a name, schema and optional user-supplied
|
|
value.
|
|
'''
|
|
self.name = name
|
|
self.schema = schema
|
|
self.user_value = value
|
|
|
|
if validate_value:
|
|
if self.has_default():
|
|
self.validate(self.default())
|
|
if self.user_value is not None:
|
|
self.validate(self.user_value)
|
|
elif not self.has_default():
|
|
raise exception.UserParameterMissing(key=self.name)
|
|
|
|
def value(self):
|
|
'''Get the parameter value, optionally sanitising it for output.'''
|
|
if self.user_value is not None:
|
|
return self.user_value
|
|
|
|
if self.has_default():
|
|
return self.default()
|
|
|
|
raise KeyError(_('Missing parameter %s') % self.name)
|
|
|
|
def hidden(self):
|
|
'''
|
|
Return whether the parameter should be sanitised in any output to
|
|
the user.
|
|
'''
|
|
return self.schema.hidden
|
|
|
|
def description(self):
|
|
'''Return the description of the parameter.'''
|
|
return self.schema.description or ''
|
|
|
|
def has_default(self):
|
|
'''Return whether the parameter has a default value.'''
|
|
return self.schema.default is not None
|
|
|
|
def default(self):
|
|
'''Return the default value of the parameter.'''
|
|
return self.schema.default
|
|
|
|
def __str__(self):
|
|
'''Return a string representation of the parameter'''
|
|
value = self.value()
|
|
if self.hidden():
|
|
return '******'
|
|
else:
|
|
return str(value)
|
|
|
|
|
|
class NumberParam(Parameter):
|
|
'''A template parameter of type "Number".'''
|
|
|
|
def __int__(self):
|
|
'''Return an integer representation of the parameter'''
|
|
return int(super(NumberParam, self).value())
|
|
|
|
def __float__(self):
|
|
'''Return a float representation of the parameter'''
|
|
return float(super(NumberParam, self).value())
|
|
|
|
def validate(self, val):
|
|
self.schema.validate(self.name, val)
|
|
|
|
def value(self):
|
|
try:
|
|
return int(self)
|
|
except ValueError:
|
|
return float(self)
|
|
|
|
|
|
class StringParam(Parameter):
|
|
'''A template parameter of type "String".'''
|
|
|
|
def validate(self, val):
|
|
self.schema.validate(self.name, val)
|
|
|
|
|
|
class CommaDelimitedListParam(Parameter, collections.Sequence):
|
|
'''A template parameter of type "CommaDelimitedList".'''
|
|
|
|
def __init__(self, name, schema, value=None, validate_value=True):
|
|
super(CommaDelimitedListParam, self).__init__(name, schema, value,
|
|
validate_value)
|
|
self.parsed = self.parse(self.user_value or self.default())
|
|
|
|
def parse(self, value):
|
|
# only parse when value is not already a list
|
|
if isinstance(value, list):
|
|
return value
|
|
|
|
try:
|
|
if value:
|
|
return value.split(',')
|
|
except (KeyError, AttributeError) as err:
|
|
message = _('Value must be a comma-delimited list string: %s')
|
|
raise ValueError(message % str(err))
|
|
return value
|
|
|
|
def value(self):
|
|
return self.parsed
|
|
|
|
def __len__(self):
|
|
'''Return the length of the list.'''
|
|
return len(self.parsed)
|
|
|
|
def __getitem__(self, index):
|
|
'''Return an item from the list.'''
|
|
return self.parsed[index]
|
|
|
|
def validate(self, val):
|
|
parsed = self.parse(val)
|
|
self.schema.validate(self.name, parsed)
|
|
|
|
|
|
class JsonParam(Parameter, collections.Mapping):
|
|
"""A template parameter who's value is valid map."""
|
|
|
|
def __init__(self, name, schema, value=None, validate_value=True):
|
|
super(JsonParam, self).__init__(name, schema, value,
|
|
validate_value)
|
|
self.parsed = self.parse(self.user_value or self.default())
|
|
|
|
def parse(self, value):
|
|
try:
|
|
val = value
|
|
if isinstance(val, collections.Mapping):
|
|
val = json.dumps(val)
|
|
if val:
|
|
return json.loads(val)
|
|
except (ValueError, TypeError) as err:
|
|
message = _('Value must be valid JSON: %s') % str(err)
|
|
raise ValueError(message)
|
|
return value
|
|
|
|
def value(self):
|
|
return self.parsed
|
|
|
|
def __getitem__(self, key):
|
|
return self.parsed[key]
|
|
|
|
def __iter__(self):
|
|
return iter(self.parsed)
|
|
|
|
def __len__(self):
|
|
return len(self.parsed)
|
|
|
|
def validate(self, val):
|
|
val = self.parse(val)
|
|
self.schema.validate(self.name, val)
|
|
|
|
|
|
class Parameters(collections.Mapping):
|
|
'''
|
|
The parameters of a stack, with type checking, defaults &c. specified by
|
|
the stack's template.
|
|
'''
|
|
|
|
PSEUDO_PARAMETERS = (
|
|
PARAM_STACK_ID, PARAM_STACK_NAME, PARAM_REGION
|
|
) = (
|
|
'AWS::StackId', 'AWS::StackName', 'AWS::Region'
|
|
)
|
|
|
|
def __init__(self, stack_identifier, tmpl, user_params={},
|
|
validate_value=True, context=None):
|
|
'''
|
|
Create the parameter container for a stack from the stack name and
|
|
template, optionally setting the user-supplied parameter values.
|
|
'''
|
|
def user_parameter(schema_item):
|
|
name, schema = schema_item
|
|
schema.context = context
|
|
return Parameter(name, schema,
|
|
user_params.get(name),
|
|
validate_value)
|
|
|
|
self.tmpl = tmpl
|
|
self._validate_tmpl_parameters()
|
|
self._validate(user_params)
|
|
|
|
schemata = self.tmpl.param_schemata()
|
|
user_parameters = (user_parameter(si) for si in schemata.iteritems())
|
|
pseudo_parameters = self._pseudo_parameters(stack_identifier)
|
|
|
|
self.params = dict((p.name,
|
|
p) for p in itertools.chain(pseudo_parameters,
|
|
user_parameters))
|
|
|
|
def __contains__(self, key):
|
|
'''Return whether the specified parameter exists.'''
|
|
return key in self.params
|
|
|
|
def __iter__(self):
|
|
'''Return an iterator over the parameter names.'''
|
|
return iter(self.params)
|
|
|
|
def __len__(self):
|
|
'''Return the number of parameters defined.'''
|
|
return len(self.params)
|
|
|
|
def __getitem__(self, key):
|
|
'''Get a parameter value.'''
|
|
return self.params[key].value()
|
|
|
|
def map(self, func, filter_func=lambda p: True):
|
|
'''
|
|
Map the supplied filter function onto each Parameter (with an
|
|
optional filter function) and return the resulting dictionary.
|
|
'''
|
|
return dict((n, func(p))
|
|
for n, p in self.params.iteritems() if filter_func(p))
|
|
|
|
def set_stack_id(self, stack_identifier):
|
|
'''
|
|
Set the StackId pseudo parameter value
|
|
'''
|
|
if stack_identifier is not None:
|
|
self.params[self.PARAM_STACK_ID].schema.set_default(
|
|
stack_identifier.arn())
|
|
return True
|
|
|
|
def _validate(self, user_params):
|
|
schemata = self.tmpl.param_schemata()
|
|
for param in user_params:
|
|
if param not in schemata:
|
|
raise exception.UnknownUserParameter(key=param)
|
|
|
|
def _validate_tmpl_parameters(self):
|
|
param = None
|
|
for key in self.tmpl.t.keys():
|
|
if key == 'Parameters' or key == 'parameters':
|
|
param = key
|
|
break
|
|
if param is not None:
|
|
template_params = self.tmpl.t[key]
|
|
for name, attrs in template_params.iteritems():
|
|
if not isinstance(attrs, dict):
|
|
raise exception.InvalidTemplateParameter(key=name)
|
|
|
|
def _pseudo_parameters(self, stack_identifier):
|
|
stack_id = stack_identifier.arn() \
|
|
if stack_identifier is not None else 'None'
|
|
stack_name = stack_identifier and stack_identifier.stack_name
|
|
|
|
yield Parameter(self.PARAM_STACK_ID,
|
|
Schema(Schema.STRING, _('Stack ID'),
|
|
default=str(stack_id)))
|
|
if stack_name:
|
|
yield Parameter(self.PARAM_STACK_NAME,
|
|
Schema(Schema.STRING, _('Stack Name'),
|
|
default=stack_name))
|
|
yield Parameter(self.PARAM_REGION,
|
|
Schema(Schema.STRING,
|
|
default='ap-southeast-1',
|
|
constraints=
|
|
[constr.AllowedValues(['us-east-1',
|
|
'us-west-1',
|
|
'us-west-2',
|
|
'sa-east-1',
|
|
'eu-west-1',
|
|
'ap-southeast-1',
|
|
'ap-northeast-1']
|
|
)]))
|