deb-heat/heat/common/environment_format.py
Thomas Herve 4f3246db45 Event transport
Implement a new mechanism to allow specifying a target in the
environment to send events to. It adds zaqar as the first
implementation.

Depends-On: Ie04f9204f3ba0f75de32253f096f439c512cddee
Change-Id: Icfc3864e08693cb4b4f921641af380b39bcf0bc0
2016-01-05 10:22:57 +01:00

66 lines
2.1 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 yaml
from heat.common.i18n import _
from heat.common import template_format
SECTIONS = (
PARAMETERS, RESOURCE_REGISTRY, PARAMETER_DEFAULTS,
ENCRYPTED_PARAM_NAMES, EVENT_SINKS
) = (
'parameters', 'resource_registry', 'parameter_defaults',
'encrypted_param_names', 'event_sinks'
)
def parse(env_str):
"""Takes a string and returns a dict containing the parsed structure."""
if env_str is None:
return {}
try:
env = template_format.yaml.load(env_str,
Loader=template_format.yaml_loader)
except yaml.YAMLError:
# NOTE(prazumovsky): we need to return more informative error for
# user, so use SafeLoader, which return error message with template
# snippet where error has been occurred.
try:
env = yaml.load(env_str, Loader=yaml.SafeLoader)
except yaml.YAMLError as yea:
raise ValueError(yea)
else:
if env is None:
env = {}
if not isinstance(env, dict):
raise ValueError(_('The environment is not a valid '
'YAML mapping data type.'))
for param in env:
if param not in SECTIONS:
raise ValueError(_('environment has wrong section "%s"') % param)
return env
def default_for_missing(env):
"""Checks a parsed environment for missing sections."""
for param in SECTIONS:
if param not in env:
if param in (ENCRYPTED_PARAM_NAMES, EVENT_SINKS):
env[param] = []
else:
env[param] = {}