openstack/heat
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heat API : add get_param_value to API utils

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Add get_param_value helper to common aws API utils

Change-Id: I69ab3ed1e34f8691457f3d986b4af06b1d381039
Signed-off-by: Steven Hardy <shardy@redhat.com>
This commit is contained in:
Steven Hardy 2012-08-28 19:25:28 +01:00
parent 43e558ff5e
commit 119d4a06f3
1 changed files with 14 additions and 0 deletions
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14
heat/api/aws/utils.py
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@ -19,6 +19,7 @@ Helper utilities related to the AWS API implementations
import re import re
import itertools import itertools
from heat.api.aws import exception
def format_response(action, response): def format_response(action, response):
@ -89,6 +90,19 @@ def extract_param_list(params, prefix=''):
return [dict(kv for di, kv in m) for mi, m in members] return [dict(kv for di, kv in m) for mi, m in members]
def get_param_value(params, key):
"""
Helper function, looks up an expected parameter in a parsed
params dict and returns the result. If params does not contain
the requested key we raise an exception of the appropriate type
"""
try:
return params[key]
except KeyError:
logger.error("Request does not contain %s parameter!" % key)
raise exception.HeatMissingParameterError(key)
def reformat_dict_keys(keymap={}, inputdict={}): def reformat_dict_keys(keymap={}, inputdict={}):
''' '''
Utility function for mapping one dict format to another Utility function for mapping one dict format to another