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# Copyright (c) 2013 Mirantis, 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.
from functools import wraps
import inspect
from exceptions import NoArgumentFound
class Context():
def __init__(self, parent_context=None, data=None):
self.parent_context = parent_context
self.functions = {}
self.data = {}
if data:
self.data['$'] = data
if parent_context:
self.depth = parent_context.depth + 1
else:
self.depth = 0
def register_function(self, function, name):
if hasattr(function, "is_context_aware"):
num_params = function.context_aware.get_num_callable_args()
if function.context_aware.varargs:
num_params = 0
else:
argspec = inspect.getargspec(function)
num_params = len(argspec.args)
if argspec.varargs:
num_params = 0
if not num_params:
num_params = '*'
if not name in self.functions:
self.functions[name] = {}
if not num_params in self.functions[name]:
self.functions[name][num_params] = [function]
else:
self.functions[name][num_params].append(function)
def get_functions(self, function_name, num_params):
result = []
if function_name in self.functions:
if num_params in self.functions[function_name]:
result += self.functions[function_name][num_params]
if '*' in self.functions[function_name]:
result += self.functions[function_name]['*']
if self.parent_context:
result += self.parent_context.get_functions(function_name,
num_params)
return result
def set_data(self, data, path='$'):
if not path.startswith('$'):
path = '$' + path
self.data[path] = data
if path == '$':
self.data['$1'] = data
def get_data(self, path='$', default=None):
if not path.startswith('$'):
path = '$' + path
if path in self.data:
return self.data[path]
if self.parent_context:
return self.parent_context.get_data(path, default)
else:
return default
def __contains__(self, item):
if not item.startswith('$'):
item = '$' + item
if item in self.data:
return True
elif self.parent_context:
return item in self.parent_context
else:
return False
class EvalArg(object):
def __init__(self, arg_name, arg_type=None, custom_validator=None):
self.arg_name = arg_name
self.arg_type = arg_type
self.custom_validator = custom_validator
def __call__(self, function):
if getattr(function, 'is_context_aware', False):
real_args = function.context_aware.real_args
else:
real_args = inspect.getargspec(function).args
if not self.arg_name in real_args:
raise NoArgumentFound(function.__name__,
self.arg_name)
if not hasattr(function, 'arg_requirements'):
function.arg_requirements = {self.arg_name: self}
else:
function.arg_requirements[self.arg_name] = self
return function
class ContextAware(object):
def __init__(self, context_parameter_name='context'):
self.context_parameter_name = context_parameter_name
def map_args(self, arg_list):
res = {}
i = 0
for real_arg in getattr(self, 'real_args', []):
if real_arg != self.context_parameter_name:
res[real_arg] = arg_list[i]
i += 1
return res
def get_num_callable_args(self):
return len(self.real_args)-1
def __call__(self, function):
@wraps(function)
def context_aware_function(context, *args):
real_args = inspect.getargspec(function).args
if not self.context_parameter_name in real_args:
raise NoArgumentFound(function.__name__,
self.context_parameter_name)
index = real_args.index(self.context_parameter_name)
args_to_pass = list(args)
args_to_pass.insert(index, context)
return function(*args_to_pass)
argspec = inspect.getargspec(function)
self.varargs = argspec.varargs
self.kwargs = argspec.keywords
self.real_args = argspec.args
f = context_aware_function
f.is_context_aware = True
f.context_aware = self
# if hasattr(function, 'arg_requirements'):
# f.arg_requirements = function.arg_requirements
return f
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