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"""
Dan Klein
Cisco Systems, Inc.
Copyright (c) 2015-2015 Cisco Systems, Inc.
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 external_packages
import yaml
class CTRexYAMLLoader(object):
TYPE_DICT = {"double":float,
"int":int,
"array":list,
"string":str,
"boolean":bool}
def __init__(self, yaml_ref_file_path):
self.yaml_path = yaml_ref_file_path
self.ref_obj = None
def check_term_param_type(self, val, val_field, ref_val, multiplier):
# print val, val_field, ref_val
tmp_type = ref_val.get('type')
if isinstance(tmp_type, list):
# item can be one of multiple types
# print "multiple choice!"
python_types = set()
for t in tmp_type:
if t in self.TYPE_DICT:
python_types.add(self.TYPE_DICT.get(t))
else:
return False, TypeError("Unknown resolving for type {0}".format(t))
# print "python legit types: ", python_types
if type(val) not in python_types:
return False, TypeError("Type of object field '{0}' is not allowed".format(val_field))
else:
# WE'RE OK!
return True, CTRexYAMLLoader._calc_final_value(val, multiplier, ref_val.get('multiply', False))
else:
# this is a single type field
python_type = self.TYPE_DICT.get(tmp_type)
if not isinstance(val, python_type):
return False, TypeError("Type of object field '{0}' is not allowed".format(val_field))
else:
# WE'RE OK!
return True, CTRexYAMLLoader._calc_final_value(val, multiplier, ref_val.get('multiply', False))
def get_reference_default(self, root_obj, sub_obj, key):
# print root_obj, sub_obj, key
if sub_obj:
ref_field = self.ref_obj.get(root_obj).get(sub_obj).get(key)
else:
ref_field = self.ref_obj.get(root_obj).get(key)
if 'has_default' in ref_field:
if ref_field.get('has_default'):
# WE'RE OK!
return True, ref_field.get('default')
else:
# This is a mandatory field!
return False, ValueError("The {0} field is mandatory and must be specified explicitly".format(key))
else:
return False, ValueError("The {0} field has no indication about default value".format(key))
def validate_yaml(self, evaluated_obj, root_obj, fill_defaults=True, multiplier=1):
if isinstance(evaluated_obj, dict) and evaluated_obj.keys() == [root_obj]:
evaluated_obj = evaluated_obj.get(root_obj)
if not self.ref_obj:
self.ref_obj = load_yaml_to_obj(self.yaml_path)
# self.load_reference()
ref_item = self.ref_obj.get(root_obj)
if ref_item is not None:
try:
typed_obj = [False, None] # first item stores validity (multiple object "shapes"), second stored type
if "type" in evaluated_obj:
ref_item = ref_item[evaluated_obj.get("type")]
# print "lower resolution with typed object"
typed_obj = [True, evaluated_obj.get("type")]
if isinstance(ref_item, dict) and "type" not in ref_item: # this is not a terminal
result_obj = {}
if typed_obj[0]:
result_obj["type"] = typed_obj[1]
# print "processing dictionary non-terminal value"
for k, v in ref_item.items():
# print "processing element '{0}' with value '{1}'".format(k,v)
if k in evaluated_obj:
# validate with ref obj
# print "found in evaluated object!"
tmp_type = v.get('type')
# print tmp_type
# print evaluated_obj
if tmp_type == "object":
# go deeper into nesting hierarchy
# print "This is an object type, recursion!"
result_obj[k] = self.validate_yaml(evaluated_obj.get(k), k, fill_defaults, multiplier)
else:
# validation on terminal type
# print "Validating terminal type %s" % k
res_ok, data = self.check_term_param_type(evaluated_obj.get(k), k, v, multiplier)
if res_ok:
# data field contains the value to save
result_obj[k] = data
else:
# data var contains the exception to throw
raise data
elif fill_defaults:
# complete missing values with default value, if exists
sub_obj = typed_obj[1] if typed_obj[0] else None
res_ok, data = self.get_reference_default(root_obj, sub_obj, k)
if res_ok:
# data field contains the value to save
result_obj[k] = data
else:
# data var contains the exception to throw
raise data
return result_obj
elif isinstance(ref_item, list):
# currently not handling list objects
return NotImplementedError("List object are currently unsupported")
else:
raise TypeError("Unknown parse tree object type.")
except KeyError as e:
raise
else:
raise KeyError("The given root_key '{key}' does not exists on reference object".format(key=root_obj))
@staticmethod
def _calc_final_value(val, multiplier, multiply):
def to_num(s):
try:
return int(s)
except ValueError:
return float(s)
if multiply:
return val * to_num(multiplier)
else:
return val
def load_yaml_to_obj(file_path):
try:
return yaml.load(file(file_path, 'r'))
except yaml.YAMLError as e:
raise
except Exception as e:
raise
def yaml_exporter(file_path):
pass
if __name__ == "__main__":
pass
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